mesa: fixup cast expression
[mesa.git] / src / mesa / main / bufferobj.c
index 0e77f73cf1888c45f93d6855f18c7cde4f74a513..222b91eb6c1dbdd73e1c8f20e25729964be4f944 100644 (file)
 
 #include <stdbool.h>
 #include <inttypes.h>  /* for PRId64 macro */
+#include "util/debug.h"
 #include "glheader.h"
 #include "enums.h"
 #include "hash.h"
-#include "imports.h"
-#include "image.h"
+#include "util/imports.h"
 #include "context.h"
 #include "bufferobj.h"
-#include "fbobject.h"
+#include "externalobjects.h"
 #include "mtypes.h"
-#include "texobj.h"
 #include "teximage.h"
 #include "glformats.h"
 #include "texstore.h"
 #include "transformfeedback.h"
-#include "dispatch.h"
+#include "varray.h"
+#include "util/u_atomic.h"
 
 
 /* Debug flags */
 /*#define BOUNDS_CHECK*/
 
 
+/**
+ * We count the number of buffer modification calls to check for
+ * inefficient buffer use.  This is the number of such calls before we
+ * issue a warning.
+ */
+#define BUFFER_WARNING_CALL_COUNT 4
+
+
+/**
+ * Helper to warn of possible performance issues, such as frequently
+ * updating a buffer created with GL_STATIC_DRAW.  Called via the macro
+ * below.
+ */
+static void
+buffer_usage_warning(struct gl_context *ctx, GLuint *id, const char *fmt, ...)
+{
+   va_list args;
+
+   va_start(args, fmt);
+   _mesa_gl_vdebugf(ctx, id,
+                    MESA_DEBUG_SOURCE_API,
+                    MESA_DEBUG_TYPE_PERFORMANCE,
+                    MESA_DEBUG_SEVERITY_MEDIUM,
+                    fmt, args);
+   va_end(args);
+}
+
+#define BUFFER_USAGE_WARNING(CTX, FMT, ...) \
+   do { \
+      static GLuint id = 0; \
+      buffer_usage_warning(CTX, &id, FMT, ##__VA_ARGS__); \
+   } while (0)
+
+
 /**
  * Used as a placeholder for buffer objects between glGenBuffers() and
  * glBindBuffer() so that glIsBuffer() can work correctly.
@@ -71,16 +105,31 @@ static struct gl_buffer_object DummyBufferObject;
 static inline struct gl_buffer_object **
 get_buffer_target(struct gl_context *ctx, GLenum target)
 {
-   /* Other targets are only supported in desktop OpenGL and OpenGL ES 3.0.
-    */
-   if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx)
-       && target != GL_ARRAY_BUFFER && target != GL_ELEMENT_ARRAY_BUFFER)
-      return NULL;
+   /* Other targets are only supported in desktop OpenGL and OpenGL ES 3.0. */
+   if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx)) {
+      switch (target) {
+      case GL_ARRAY_BUFFER:
+      case GL_ELEMENT_ARRAY_BUFFER:
+         break;
+      case GL_PIXEL_PACK_BUFFER:
+      case GL_PIXEL_UNPACK_BUFFER:
+         if (!ctx->Extensions.EXT_pixel_buffer_object)
+            return NULL;
+         break;
+      default:
+         return NULL;
+      }
+   }
 
    switch (target) {
    case GL_ARRAY_BUFFER_ARB:
+      if (ctx->Array.ArrayBufferObj)
+         ctx->Array.ArrayBufferObj->UsageHistory |= USAGE_ARRAY_BUFFER;
       return &ctx->Array.ArrayBufferObj;
    case GL_ELEMENT_ARRAY_BUFFER_ARB:
+      if (ctx->Array.VAO->IndexBufferObj)
+         ctx->Array.VAO->IndexBufferObj->UsageHistory
+            |= USAGE_ELEMENT_ARRAY_BUFFER;
       return &ctx->Array.VAO->IndexBufferObj;
    case GL_PIXEL_PACK_BUFFER_EXT:
       return &ctx->Pack.BufferObj;
@@ -90,20 +139,34 @@ get_buffer_target(struct gl_context *ctx, GLenum target)
       return &ctx->CopyReadBuffer;
    case GL_COPY_WRITE_BUFFER:
       return &ctx->CopyWriteBuffer;
+   case GL_QUERY_BUFFER:
+      if (_mesa_has_ARB_query_buffer_object(ctx))
+         return &ctx->QueryBuffer;
+      break;
    case GL_DRAW_INDIRECT_BUFFER:
-      if (ctx->API == API_OPENGL_CORE &&
-          ctx->Extensions.ARB_draw_indirect) {
+      if ((_mesa_is_desktop_gl(ctx) && ctx->Extensions.ARB_draw_indirect) ||
+           _mesa_is_gles31(ctx)) {
          return &ctx->DrawIndirectBuffer;
       }
       break;
+   case GL_PARAMETER_BUFFER_ARB:
+      if (_mesa_has_ARB_indirect_parameters(ctx)) {
+         return &ctx->ParameterBuffer;
+      }
+      break;
+   case GL_DISPATCH_INDIRECT_BUFFER:
+      if (_mesa_has_compute_shaders(ctx)) {
+         return &ctx->DispatchIndirectBuffer;
+      }
+      break;
    case GL_TRANSFORM_FEEDBACK_BUFFER:
       if (ctx->Extensions.EXT_transform_feedback) {
          return &ctx->TransformFeedback.CurrentBuffer;
       }
       break;
    case GL_TEXTURE_BUFFER:
-      if (ctx->API == API_OPENGL_CORE &&
-          ctx->Extensions.ARB_texture_buffer_object) {
+      if (_mesa_has_ARB_texture_buffer_object(ctx) ||
+          _mesa_has_OES_texture_buffer(ctx)) {
          return &ctx->Texture.BufferObject;
       }
       break;
@@ -112,6 +175,11 @@ get_buffer_target(struct gl_context *ctx, GLenum target)
          return &ctx->UniformBuffer;
       }
       break;
+   case GL_SHADER_STORAGE_BUFFER:
+      if (ctx->Extensions.ARB_shader_storage_buffer_object) {
+         return &ctx->ShaderStorageBuffer;
+      }
+      break;
    case GL_ATOMIC_COUNTER_BUFFER:
       if (ctx->Extensions.ARB_shader_atomic_counters) {
          return &ctx->AtomicBuffer;
@@ -148,7 +216,7 @@ get_buffer(struct gl_context *ctx, const char *func, GLenum target,
       return NULL;
    }
 
-   if (!_mesa_is_bufferobj(*bufObj)) {
+   if (!*bufObj) {
       _mesa_error(ctx, error, "%s(no buffer bound)", func);
       return NULL;
    }
@@ -244,7 +312,7 @@ bufferobj_range_mapped(const struct gl_buffer_object *obj,
  */
 static bool
 buffer_object_subdata_range_good(struct gl_context *ctx,
-                                 struct gl_buffer_object *bufObj,
+                                 const struct gl_buffer_object *bufObj,
                                  GLintptr offset, GLsizeiptr size,
                                  bool mappedRange, const char *caller)
 {
@@ -293,7 +361,8 @@ buffer_object_subdata_range_good(struct gl_context *ctx,
 
 /**
  * Test the format and type parameters and set the GL error code for
- * \c glClearBufferData and \c glClearBufferSubData.
+ * \c glClearBufferData, \c glClearNamedBufferData, \c glClearBufferSubData
+ * and \c glClearNamedBufferSubData.
  *
  * \param ctx             GL context.
  * \param internalformat  Format to which the data is to be converted.
@@ -303,7 +372,8 @@ buffer_object_subdata_range_good(struct gl_context *ctx,
  * \return   If internalformat, format and type are legal the mesa_format
  *           corresponding to internalformat, otherwise MESA_FORMAT_NONE.
  *
- * \sa glClearBufferData and glClearBufferSubData
+ * \sa glClearBufferData, glClearNamedBufferData, glClearBufferSubData and
+ *     glClearNamedBufferSubData.
  */
 static mesa_format
 validate_clear_buffer_format(struct gl_context *ctx,
@@ -333,14 +403,14 @@ validate_clear_buffer_format(struct gl_context *ctx,
    }
 
    if (!_mesa_is_color_format(format)) {
-      _mesa_error(ctx, GL_INVALID_ENUM,
+      _mesa_error(ctx, GL_INVALID_VALUE,
                   "%s(format is not a color format)", caller);
       return MESA_FORMAT_NONE;
    }
 
    errorFormatType = _mesa_error_check_format_and_type(ctx, format, type);
    if (errorFormatType != GL_NO_ERROR) {
-      _mesa_error(ctx, GL_INVALID_ENUM,
+      _mesa_error(ctx, GL_INVALID_VALUE,
                   "%s(invalid format or type)", caller);
       return MESA_FORMAT_NONE;
    }
@@ -385,17 +455,16 @@ convert_clear_buffer_data(struct gl_context *ctx,
 
 /**
  * Allocate and initialize a new buffer object.
- * 
+ *
  * Default callback for the \c dd_function_table::NewBufferObject() hook.
  */
 static struct gl_buffer_object *
 _mesa_new_buffer_object(struct gl_context *ctx, GLuint name)
 {
-   struct gl_buffer_object *obj;
-
-   (void) ctx;
+   struct gl_buffer_object *obj = MALLOC_STRUCT(gl_buffer_object);
+   if (!obj)
+      return NULL;
 
-   obj = MALLOC_STRUCT(gl_buffer_object);
    _mesa_initialize_buffer_object(ctx, obj, name);
    return obj;
 }
@@ -403,22 +472,23 @@ _mesa_new_buffer_object(struct gl_context *ctx, GLuint name)
 
 /**
  * Delete a buffer object.
- * 
+ *
  * Default callback for the \c dd_function_table::DeleteBuffer() hook.
  */
-static void
+void
 _mesa_delete_buffer_object(struct gl_context *ctx,
                            struct gl_buffer_object *bufObj)
 {
    (void) ctx;
 
+   vbo_delete_minmax_cache(bufObj);
    _mesa_align_free(bufObj->Data);
 
    /* assign strange values here to help w/ debugging */
    bufObj->RefCount = -1000;
    bufObj->Name = ~0;
 
-   mtx_destroy(&bufObj->Mutex);
+   simple_mtx_destroy(&bufObj->MinMaxCacheMutex);
    free(bufObj->Label);
    free(bufObj);
 }
@@ -437,29 +507,9 @@ _mesa_reference_buffer_object_(struct gl_context *ctx,
 {
    if (*ptr) {
       /* Unreference the old buffer */
-      GLboolean deleteFlag = GL_FALSE;
       struct gl_buffer_object *oldObj = *ptr;
 
-      mtx_lock(&oldObj->Mutex);
-      assert(oldObj->RefCount > 0);
-      oldObj->RefCount--;
-#if 0
-      printf("BufferObj %p %d DECR to %d\n",
-             (void *) oldObj, oldObj->Name, oldObj->RefCount);
-#endif
-      deleteFlag = (oldObj->RefCount == 0);
-      mtx_unlock(&oldObj->Mutex);
-
-      if (deleteFlag) {
-
-         /* some sanity checking: don't delete a buffer still in use */
-#if 0
-         /* unfortunately, these tests are invalid during context tear-down */
-        assert(ctx->Array.ArrayBufferObj != bufObj);
-        assert(ctx->Array.VAO->IndexBufferObj != bufObj);
-        assert(ctx->Array.VAO->Vertex.BufferObj != bufObj);
-#endif
-
+      if (p_atomic_dec_zero(&oldObj->RefCount)) {
         assert(ctx->Driver.DeleteBuffer);
          ctx->Driver.DeleteBuffer(ctx, oldObj);
       }
@@ -470,23 +520,27 @@ _mesa_reference_buffer_object_(struct gl_context *ctx,
 
    if (bufObj) {
       /* reference new buffer */
-      mtx_lock(&bufObj->Mutex);
-      if (bufObj->RefCount == 0) {
-         /* this buffer's being deleted (look just above) */
-         /* Not sure this can every really happen.  Warn if it does. */
-         _mesa_problem(NULL, "referencing deleted buffer object");
-         *ptr = NULL;
-      }
-      else {
-         bufObj->RefCount++;
-#if 0
-         printf("BufferObj %p %d INCR to %d\n",
-                (void *) bufObj, bufObj->Name, bufObj->RefCount);
-#endif
-         *ptr = bufObj;
-      }
-      mtx_unlock(&bufObj->Mutex);
+      p_atomic_inc(&bufObj->RefCount);
+      *ptr = bufObj;
+   }
+}
+
+
+/**
+ * Get the value of MESA_NO_MINMAX_CACHE.
+ */
+static bool
+get_no_minmax_cache()
+{
+   static bool read = false;
+   static bool disable = false;
+
+   if (!read) {
+      disable = env_var_as_boolean("MESA_NO_MINMAX_CACHE", false);
+      read = true;
    }
+
+   return disable;
 }
 
 
@@ -499,10 +553,13 @@ _mesa_initialize_buffer_object(struct gl_context *ctx,
                                GLuint name)
 {
    memset(obj, 0, sizeof(struct gl_buffer_object));
-   mtx_init(&obj->Mutex, mtx_plain);
    obj->RefCount = 1;
    obj->Name = name;
    obj->Usage = GL_STATIC_DRAW_ARB;
+
+   simple_mtx_init(&obj->MinMaxCacheMutex, mtx_plain);
+   if (get_no_minmax_cache())
+      obj->UsageHistory |= USAGE_DISABLE_MINMAX_CACHE;
 }
 
 
@@ -517,6 +574,7 @@ count_buffer_size(GLuint key, void *data, void *userData)
       (const struct gl_buffer_object *) data;
    GLuint *total = (GLuint *) userData;
 
+   (void) key;
    *total = *total + bufObj->Size;
 }
 
@@ -556,7 +614,7 @@ _mesa_total_buffer_object_memory(struct gl_context *ctx)
  * \sa glBufferDataARB, dd_function_table::BufferData.
  */
 static GLboolean
-buffer_data_fallback(struct gl_context *ctx, GLenum target, GLsizeiptr size,
+buffer_data_fallback(struct gl_context *ctx, GLenum target, GLsizeiptrARB size,
                      const GLvoid *data, GLenum usage, GLenum storageFlags,
                      struct gl_buffer_object *bufObj)
 {
@@ -602,8 +660,8 @@ buffer_data_fallback(struct gl_context *ctx, GLenum target, GLsizeiptr size,
  * \sa glBufferSubDataARB, dd_function_table::BufferSubData.
  */
 static void
-buffer_sub_data_fallback(struct gl_context *ctx, GLintptr offset,
-                         GLsizeiptr size, const GLvoid *data,
+buffer_sub_data_fallback(struct gl_context *ctx, GLintptrARB offset,
+                         GLsizeiptrARB size, const GLvoid *data,
                          struct gl_buffer_object *bufObj)
 {
    (void) ctx;
@@ -635,9 +693,9 @@ buffer_sub_data_fallback(struct gl_context *ctx, GLintptr offset,
  * \sa glBufferGetSubDataARB, dd_function_table::GetBufferSubData.
  */
 static void
-_mesa_buffer_get_subdata( struct gl_context *ctx, GLintptrARB offset,
-                         GLsizeiptrARB size, GLvoid * data,
-                         struct gl_buffer_object * bufObj )
+buffer_get_subdata(struct gl_context *ctx, GLintptrARB offset,
+                   GLsizeiptrARB size, GLvoid *data,
+                   struct gl_buffer_object *bufObj )
 {
    (void) ctx;
 
@@ -706,10 +764,10 @@ _mesa_ClearBufferSubData_sw(struct gl_context *ctx,
  * Called via glMapBufferRange().
  */
 static void *
-_mesa_buffer_map_range( struct gl_context *ctx, GLintptr offset,
-                        GLsizeiptr length, GLbitfield access,
-                        struct gl_buffer_object *bufObj,
-                        gl_map_buffer_index index)
+map_buffer_range_fallback(struct gl_context *ctx, GLintptr offset,
+                          GLsizeiptr length, GLbitfield access,
+                          struct gl_buffer_object *bufObj,
+                          gl_map_buffer_index index)
 {
    (void) ctx;
    assert(!_mesa_bufferobj_mapped(bufObj, index));
@@ -727,29 +785,30 @@ _mesa_buffer_map_range( struct gl_context *ctx, GLintptr offset,
  * Called via glFlushMappedBufferRange().
  */
 static void
-_mesa_buffer_flush_mapped_range( struct gl_context *ctx,
-                                 GLintptr offset, GLsizeiptr length,
-                                 struct gl_buffer_object *obj,
-                                 gl_map_buffer_index index)
+flush_mapped_buffer_range_fallback(struct gl_context *ctx,
+                                   GLintptr offset, GLsizeiptr length,
+                                   struct gl_buffer_object *obj,
+                                   gl_map_buffer_index index)
 {
    (void) ctx;
    (void) offset;
    (void) length;
    (void) obj;
+   (void) index;
    /* no-op */
 }
 
 
 /**
- * Default callback for \c dd_function_table::MapBuffer().
+ * Default callback for \c dd_function_table::UnmapBuffer().
  *
  * The input parameters will have been already tested for errors.
  *
  * \sa glUnmapBufferARB, dd_function_table::UnmapBuffer
  */
 static GLboolean
-_mesa_buffer_unmap(struct gl_context *ctx, struct gl_buffer_object *bufObj,
-                   gl_map_buffer_index index)
+unmap_buffer_fallback(struct gl_context *ctx, struct gl_buffer_object *bufObj,
+                      gl_map_buffer_index index)
 {
    (void) ctx;
    /* XXX we might assert here that bufObj->Pointer is non-null */
@@ -817,40 +876,31 @@ _mesa_init_buffer_objects( struct gl_context *ctx )
    GLuint i;
 
    memset(&DummyBufferObject, 0, sizeof(DummyBufferObject));
-   mtx_init(&DummyBufferObject.Mutex, mtx_plain);
+   simple_mtx_init(&DummyBufferObject.MinMaxCacheMutex, mtx_plain);
    DummyBufferObject.RefCount = 1000*1000*1000; /* never delete */
 
-   _mesa_reference_buffer_object(ctx, &ctx->Array.ArrayBufferObj,
-                                 ctx->Shared->NullBufferObj);
-
-   _mesa_reference_buffer_object(ctx, &ctx->CopyReadBuffer,
-                                 ctx->Shared->NullBufferObj);
-   _mesa_reference_buffer_object(ctx, &ctx->CopyWriteBuffer,
-                                 ctx->Shared->NullBufferObj);
-
-   _mesa_reference_buffer_object(ctx, &ctx->UniformBuffer,
-                                ctx->Shared->NullBufferObj);
-
-   _mesa_reference_buffer_object(ctx, &ctx->AtomicBuffer,
-                                ctx->Shared->NullBufferObj);
-
-   _mesa_reference_buffer_object(ctx, &ctx->DrawIndirectBuffer,
-                                ctx->Shared->NullBufferObj);
-
    for (i = 0; i < MAX_COMBINED_UNIFORM_BUFFERS; i++) {
       _mesa_reference_buffer_object(ctx,
                                    &ctx->UniformBufferBindings[i].BufferObject,
-                                   ctx->Shared->NullBufferObj);
+                                   NULL);
       ctx->UniformBufferBindings[i].Offset = -1;
       ctx->UniformBufferBindings[i].Size = -1;
    }
 
+   for (i = 0; i < MAX_COMBINED_SHADER_STORAGE_BUFFERS; i++) {
+      _mesa_reference_buffer_object(ctx,
+                                    &ctx->ShaderStorageBufferBindings[i].BufferObject,
+                                    NULL);
+      ctx->ShaderStorageBufferBindings[i].Offset = -1;
+      ctx->ShaderStorageBufferBindings[i].Size = -1;
+   }
+
    for (i = 0; i < MAX_COMBINED_ATOMIC_BUFFERS; i++) {
       _mesa_reference_buffer_object(ctx,
                                    &ctx->AtomicBufferBindings[i].BufferObject,
-                                   ctx->Shared->NullBufferObj);
-      ctx->AtomicBufferBindings[i].Offset = -1;
-      ctx->AtomicBufferBindings[i].Size = -1;
+                                   NULL);
+      ctx->AtomicBufferBindings[i].Offset = 0;
+      ctx->AtomicBufferBindings[i].Size = 0;
    }
 }
 
@@ -867,16 +917,30 @@ _mesa_free_buffer_objects( struct gl_context *ctx )
 
    _mesa_reference_buffer_object(ctx, &ctx->UniformBuffer, NULL);
 
+   _mesa_reference_buffer_object(ctx, &ctx->ShaderStorageBuffer, NULL);
+
    _mesa_reference_buffer_object(ctx, &ctx->AtomicBuffer, NULL);
 
    _mesa_reference_buffer_object(ctx, &ctx->DrawIndirectBuffer, NULL);
 
+   _mesa_reference_buffer_object(ctx, &ctx->ParameterBuffer, NULL);
+
+   _mesa_reference_buffer_object(ctx, &ctx->DispatchIndirectBuffer, NULL);
+
+   _mesa_reference_buffer_object(ctx, &ctx->QueryBuffer, NULL);
+
    for (i = 0; i < MAX_COMBINED_UNIFORM_BUFFERS; i++) {
       _mesa_reference_buffer_object(ctx,
                                    &ctx->UniformBufferBindings[i].BufferObject,
                                    NULL);
    }
 
+   for (i = 0; i < MAX_COMBINED_SHADER_STORAGE_BUFFERS; i++) {
+      _mesa_reference_buffer_object(ctx,
+                                    &ctx->ShaderStorageBufferBindings[i].BufferObject,
+                                    NULL);
+   }
+
    for (i = 0; i < MAX_COMBINED_ATOMIC_BUFFERS; i++) {
       _mesa_reference_buffer_object(ctx,
                                    &ctx->AtomicBufferBindings[i].BufferObject,
@@ -887,14 +951,13 @@ _mesa_free_buffer_objects( struct gl_context *ctx )
 
 bool
 _mesa_handle_bind_buffer_gen(struct gl_context *ctx,
-                             GLenum target,
                              GLuint buffer,
                              struct gl_buffer_object **buf_handle,
                              const char *caller)
 {
    struct gl_buffer_object *buf = *buf_handle;
 
-   if (!buf && ctx->API == API_OPENGL_CORE) {
+   if (!buf && (ctx->API == API_OPENGL_CORE)) {
       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(non-gen name)", caller);
       return false;
    }
@@ -903,7 +966,6 @@ _mesa_handle_bind_buffer_gen(struct gl_context *ctx,
       /* If this is a new buffer object id, or one which was generated but
        * never used before, allocate a buffer object now.
        */
-      assert(ctx->Driver.NewBufferObject);
       buf = ctx->Driver.NewBufferObject(ctx, buffer);
       if (!buf) {
         _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", caller);
@@ -921,40 +983,35 @@ _mesa_handle_bind_buffer_gen(struct gl_context *ctx,
  * Called by glBindBuffer() and other functions.
  */
 static void
-bind_buffer_object(struct gl_context *ctx, GLenum target, GLuint buffer)
+bind_buffer_object(struct gl_context *ctx,
+                   struct gl_buffer_object **bindTarget, GLuint buffer)
 {
    struct gl_buffer_object *oldBufObj;
    struct gl_buffer_object *newBufObj = NULL;
-   struct gl_buffer_object **bindTarget = NULL;
 
-   bindTarget = get_buffer_target(ctx, target);
-   if (!bindTarget) {
-      _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferARB(target 0x%x)", target);
-      return;
-   }
+   assert(bindTarget);
 
    /* Get pointer to old buffer object (to be unbound) */
    oldBufObj = *bindTarget;
-   if (oldBufObj && oldBufObj->Name == buffer && !oldBufObj->DeletePending)
+   if ((oldBufObj && oldBufObj->Name == buffer && !oldBufObj->DeletePending) ||
+       (!oldBufObj && buffer == 0))
       return;   /* rebinding the same buffer object- no change */
 
    /*
     * Get pointer to new buffer object (newBufObj)
     */
-   if (buffer == 0) {
-      /* The spec says there's not a buffer object named 0, but we use
-       * one internally because it simplifies things.
-       */
-      newBufObj = ctx->Shared->NullBufferObj;
-   }
-   else {
+   if (buffer != 0) {
       /* non-default buffer object */
       newBufObj = _mesa_lookup_bufferobj(ctx, buffer);
-      if (!_mesa_handle_bind_buffer_gen(ctx, target, buffer,
+      if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
                                         &newBufObj, "glBindBuffer"))
          return;
+
+      /* record usage history */
+      if (bindTarget == &ctx->Pack.BufferObj)
+         newBufObj->UsageHistory |= USAGE_PIXEL_PACK_BUFFER;
    }
-   
+
    /* bind new buffer */
    _mesa_reference_buffer_object(ctx, bindTarget, newBufObj);
 }
@@ -962,19 +1019,17 @@ bind_buffer_object(struct gl_context *ctx, GLenum target, GLuint buffer)
 
 /**
  * Update the default buffer objects in the given context to reference those
- * specified in the shared state and release those referencing the old 
+ * specified in the shared state and release those referencing the old
  * shared state.
  */
 void
 _mesa_update_default_objects_buffer_objects(struct gl_context *ctx)
 {
-   /* Bind the NullBufferObj to remove references to those
-    * in the shared context hash table.
-    */
-   bind_buffer_object( ctx, GL_ARRAY_BUFFER_ARB, 0);
-   bind_buffer_object( ctx, GL_ELEMENT_ARRAY_BUFFER_ARB, 0);
-   bind_buffer_object( ctx, GL_PIXEL_PACK_BUFFER_ARB, 0);
-   bind_buffer_object( ctx, GL_PIXEL_UNPACK_BUFFER_ARB, 0);
+   /* Bind 0 to remove references to those in the shared context hash table. */
+   bind_buffer_object(ctx, &ctx->Array.ArrayBufferObj, 0);
+   bind_buffer_object(ctx, &ctx->Array.VAO->IndexBufferObj, 0);
+   bind_buffer_object(ctx, &ctx->Pack.BufferObj, 0);
+   bind_buffer_object(ctx, &ctx->Unpack.BufferObj, 0);
 }
 
 
@@ -997,14 +1052,17 @@ _mesa_lookup_bufferobj(struct gl_context *ctx, GLuint buffer)
 struct gl_buffer_object *
 _mesa_lookup_bufferobj_locked(struct gl_context *ctx, GLuint buffer)
 {
-   return (struct gl_buffer_object *)
-      _mesa_HashLookupLocked(ctx->Shared->BufferObjects, buffer);
+   if (buffer == 0)
+      return NULL;
+   else
+      return (struct gl_buffer_object *)
+         _mesa_HashLookupLocked(ctx->Shared->BufferObjects, buffer);
 }
 
 /**
  * A convenience function for direct state access functions that throws
- * GL_INVALID_OPERATION if buffer is not the name of a buffer object in the
- * hash table.
+ * GL_INVALID_OPERATION if buffer is not the name of an existing
+ * buffer object.
  */
 struct gl_buffer_object *
 _mesa_lookup_bufferobj_err(struct gl_context *ctx, GLuint buffer,
@@ -1013,28 +1071,16 @@ _mesa_lookup_bufferobj_err(struct gl_context *ctx, GLuint buffer,
    struct gl_buffer_object *bufObj;
 
    bufObj = _mesa_lookup_bufferobj(ctx, buffer);
-   if (!bufObj)
+   if (!bufObj || bufObj == &DummyBufferObject) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "%s(non-generated buffer name %u)", caller, buffer);
+                  "%s(non-existent buffer object %u)", caller, buffer);
+      return NULL;
+   }
 
    return bufObj;
 }
 
 
-void
-_mesa_begin_bufferobj_lookups(struct gl_context *ctx)
-{
-   _mesa_HashLockMutex(ctx->Shared->BufferObjects);
-}
-
-
-void
-_mesa_end_bufferobj_lookups(struct gl_context *ctx)
-{
-   _mesa_HashUnlockMutex(ctx->Shared->BufferObjects);
-}
-
-
 /**
  * Look up a buffer object for a multi-bind function.
  *
@@ -1043,20 +1089,23 @@ _mesa_end_bufferobj_lookups(struct gl_context *ctx)
  * of an existing buffer object.
  *
  * If the buffer ID refers to an existing buffer object, a pointer
- * to the buffer object is returned.  If the ID is zero, a pointer
- * to the shared NullBufferObj is returned.  If the ID is not zero
- * and does not refer to a valid buffer object, this function
- * returns NULL.
+ * to the buffer object is returned.  If the ID is zero, NULL is returned.
+ * If the ID is not zero and does not refer to a valid buffer object, this
+ * function returns NULL.
  *
  * This function assumes that the caller has already locked the
- * hash table mutex by calling _mesa_begin_bufferobj_lookups().
+ * hash table mutex by calling
+ * _mesa_HashLockMutex(ctx->Shared->BufferObjects).
  */
 struct gl_buffer_object *
 _mesa_multi_bind_lookup_bufferobj(struct gl_context *ctx,
                                   const GLuint *buffers,
-                                  GLuint index, const char *caller)
+                                  GLuint index, const char *caller,
+                                  bool *error)
 {
-   struct gl_buffer_object *bufObj;
+   struct gl_buffer_object *bufObj = NULL;
+
+   *error = false;
 
    if (buffers[index] != 0) {
       bufObj = _mesa_lookup_bufferobj_locked(ctx, buffers[index]);
@@ -1065,20 +1114,20 @@ _mesa_multi_bind_lookup_bufferobj(struct gl_context *ctx,
          when they don't exist. */
       if (bufObj == &DummyBufferObject)
          bufObj = NULL;
-   } else
-      bufObj = ctx->Shared->NullBufferObj;
 
-   if (!bufObj) {
-      /* The ARB_multi_bind spec says:
-       *
-       *    "An INVALID_OPERATION error is generated if any value
-       *     in <buffers> is not zero or the name of an existing
-       *     buffer object (per binding)."
-       */
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "%s(buffers[%u]=%u is not zero or the name "
-                  "of an existing buffer object)",
-                  caller, index, buffers[index]);
+      if (!bufObj) {
+         /* The ARB_multi_bind spec says:
+          *
+          *    "An INVALID_OPERATION error is generated if any value
+          *     in <buffers> is not zero or the name of an existing
+          *     buffer object (per binding)."
+          */
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "%s(buffers[%u]=%u is not zero or the name "
+                     "of an existing buffer object)",
+                     caller, index, buffers[index]);
+         *error = true;
+      }
    }
 
    return bufObj;
@@ -1093,11 +1142,13 @@ _mesa_multi_bind_lookup_bufferobj(struct gl_context *ctx,
  */
 static void
 unbind(struct gl_context *ctx,
-       struct gl_buffer_object **ptr,
+       struct gl_vertex_array_object *vao, unsigned index,
        struct gl_buffer_object *obj)
 {
-   if (*ptr == obj) {
-      _mesa_reference_buffer_object(ctx, ptr, ctx->Shared->NullBufferObj);
+   if (vao->BufferBinding[index].BufferObj == obj) {
+      _mesa_bind_vertex_buffer(ctx, vao, index, NULL,
+                               vao->BufferBinding[index].Offset,
+                               vao->BufferBinding[index].Stride);
    }
 }
 
@@ -1114,15 +1165,15 @@ _mesa_init_buffer_object_functions(struct dd_function_table *driver)
    driver->DeleteBuffer = _mesa_delete_buffer_object;
    driver->BufferData = buffer_data_fallback;
    driver->BufferSubData = buffer_sub_data_fallback;
-   driver->GetBufferSubData = _mesa_buffer_get_subdata;
-   driver->UnmapBuffer = _mesa_buffer_unmap;
+   driver->GetBufferSubData = buffer_get_subdata;
+   driver->UnmapBuffer = unmap_buffer_fallback;
 
    /* GL_ARB_clear_buffer_object */
    driver->ClearBufferSubData = _mesa_ClearBufferSubData_sw;
 
    /* GL_ARB_map_buffer_range */
-   driver->MapBufferRange = _mesa_buffer_map_range;
-   driver->FlushMappedBufferRange = _mesa_buffer_flush_mapped_range;
+   driver->MapBufferRange = map_buffer_range_fallback;
+   driver->FlushMappedBufferRange = flush_mapped_buffer_range_fallback;
 
    /* GL_ARB_copy_buffer */
    driver->CopyBufferSubData = copy_buffer_sub_data_fallback;
@@ -1133,9 +1184,7 @@ void
 _mesa_buffer_unmap_all_mappings(struct gl_context *ctx,
                                 struct gl_buffer_object *bufObj)
 {
-   int i;
-
-   for (i = 0; i < MAP_COUNT; i++) {
+   for (int i = 0; i < MAP_COUNT; i++) {
       if (_mesa_bufferobj_mapped(bufObj, i)) {
          ctx->Driver.UnmapBuffer(ctx, bufObj, i);
          assert(bufObj->Mappings[i].Pointer == NULL);
@@ -1150,173 +1199,426 @@ _mesa_buffer_unmap_all_mappings(struct gl_context *ctx,
 /**********************************************************************/
 
 void GLAPIENTRY
-_mesa_BindBuffer(GLenum target, GLuint buffer)
+_mesa_BindBuffer_no_error(GLenum target, GLuint buffer)
 {
    GET_CURRENT_CONTEXT(ctx);
 
-   if (MESA_VERBOSE & VERBOSE_API)
-      _mesa_debug(ctx, "glBindBuffer(%s, %u)\n",
-                  _mesa_lookup_enum_by_nr(target), buffer);
-
-   bind_buffer_object(ctx, target, buffer);
+   struct gl_buffer_object **bindTarget = get_buffer_target(ctx, target);
+   bind_buffer_object(ctx, bindTarget, buffer);
 }
 
 
-/**
- * Delete a set of buffer objects.
- * 
- * \param n      Number of buffer objects to delete.
- * \param ids    Array of \c n buffer object IDs.
- */
 void GLAPIENTRY
-_mesa_DeleteBuffers(GLsizei n, const GLuint *ids)
+_mesa_BindBuffer(GLenum target, GLuint buffer)
 {
    GET_CURRENT_CONTEXT(ctx);
-   GLsizei i;
-   FLUSH_VERTICES(ctx, 0);
 
-   if (n < 0) {
-      _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteBuffersARB(n)");
-      return;
+   if (MESA_VERBOSE & VERBOSE_API) {
+      _mesa_debug(ctx, "glBindBuffer(%s, %u)\n",
+                  _mesa_enum_to_string(target), buffer);
    }
 
-   mtx_lock(&ctx->Shared->Mutex);
-
-   for (i = 0; i < n; i++) {
-      struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, ids[i]);
-      if (bufObj) {
-         struct gl_vertex_array_object *vao = ctx->Array.VAO;
-         GLuint j;
-
-         assert(bufObj->Name == ids[i] || bufObj == &DummyBufferObject);
-
-         _mesa_buffer_unmap_all_mappings(ctx, bufObj);
-
-         /* unbind any vertex pointers bound to this buffer */
-         for (j = 0; j < ARRAY_SIZE(vao->VertexBinding); j++) {
-            unbind(ctx, &vao->VertexBinding[j].BufferObj, bufObj);
-         }
-
-         if (ctx->Array.ArrayBufferObj == bufObj) {
-            _mesa_BindBuffer( GL_ARRAY_BUFFER_ARB, 0 );
-         }
-         if (vao->IndexBufferObj == bufObj) {
-            _mesa_BindBuffer( GL_ELEMENT_ARRAY_BUFFER_ARB, 0 );
-         }
-
-         /* unbind ARB_draw_indirect binding point */
-         if (ctx->DrawIndirectBuffer == bufObj) {
-            _mesa_BindBuffer( GL_DRAW_INDIRECT_BUFFER, 0 );
-         }
-
-         /* unbind ARB_copy_buffer binding points */
-         if (ctx->CopyReadBuffer == bufObj) {
-            _mesa_BindBuffer( GL_COPY_READ_BUFFER, 0 );
-         }
-         if (ctx->CopyWriteBuffer == bufObj) {
-            _mesa_BindBuffer( GL_COPY_WRITE_BUFFER, 0 );
-         }
-
-         /* unbind transform feedback binding points */
-         if (ctx->TransformFeedback.CurrentBuffer == bufObj) {
-            _mesa_BindBuffer( GL_TRANSFORM_FEEDBACK_BUFFER, 0 );
-         }
-         for (j = 0; j < MAX_FEEDBACK_BUFFERS; j++) {
-            if (ctx->TransformFeedback.CurrentObject->Buffers[j] == bufObj) {
-               _mesa_BindBufferBase( GL_TRANSFORM_FEEDBACK_BUFFER, j, 0 );
-            }
-         }
-
-         /* unbind UBO binding points */
-         for (j = 0; j < ctx->Const.MaxUniformBufferBindings; j++) {
-            if (ctx->UniformBufferBindings[j].BufferObject == bufObj) {
-               _mesa_BindBufferBase( GL_UNIFORM_BUFFER, j, 0 );
-            }
-         }
-
-         if (ctx->UniformBuffer == bufObj) {
-            _mesa_BindBuffer( GL_UNIFORM_BUFFER, 0 );
-         }
-
-         /* unbind Atomci Buffer binding points */
-         for (j = 0; j < ctx->Const.MaxAtomicBufferBindings; j++) {
-            if (ctx->AtomicBufferBindings[j].BufferObject == bufObj) {
-               _mesa_BindBufferBase( GL_ATOMIC_COUNTER_BUFFER, j, 0 );
-            }
-         }
-
-         if (ctx->AtomicBuffer == bufObj) {
-            _mesa_BindBuffer( GL_ATOMIC_COUNTER_BUFFER, 0 );
-         }
-
-         /* unbind any pixel pack/unpack pointers bound to this buffer */
-         if (ctx->Pack.BufferObj == bufObj) {
-            _mesa_BindBuffer( GL_PIXEL_PACK_BUFFER_EXT, 0 );
-         }
-         if (ctx->Unpack.BufferObj == bufObj) {
-            _mesa_BindBuffer( GL_PIXEL_UNPACK_BUFFER_EXT, 0 );
-         }
-
-         if (ctx->Texture.BufferObject == bufObj) {
-            _mesa_BindBuffer( GL_TEXTURE_BUFFER, 0 );
-         }
-
-         if (ctx->ExternalVirtualMemoryBuffer == bufObj) {
-            _mesa_BindBuffer(GL_EXTERNAL_VIRTUAL_MEMORY_BUFFER_AMD, 0);
-         }
-
-         /* The ID is immediately freed for re-use */
-         _mesa_HashRemove(ctx->Shared->BufferObjects, ids[i]);
-         /* Make sure we do not run into the classic ABA problem on bind.
-          * We don't want to allow re-binding a buffer object that's been
-          * "deleted" by glDeleteBuffers().
-          *
-          * The explicit rebinding to the default object in the current context
-          * prevents the above in the current context, but another context
-          * sharing the same objects might suffer from this problem.
-          * The alternative would be to do the hash lookup in any case on bind
-          * which would introduce more runtime overhead than this.
-          */
-         bufObj->DeletePending = GL_TRUE;
-         _mesa_reference_buffer_object(ctx, &bufObj, NULL);
-      }
+   struct gl_buffer_object **bindTarget = get_buffer_target(ctx, target);
+   if (!bindTarget) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferARB(target %s)",
+                  _mesa_enum_to_string(target));
+      return;
    }
 
-   mtx_unlock(&ctx->Shared->Mutex);
+   bind_buffer_object(ctx, bindTarget, buffer);
 }
 
-
 /**
- * This is the implementation for glGenBuffers and glCreateBuffers. It is not
- * exposed to the rest of Mesa to encourage the use of nameless buffers in
- * driver internals.
+ * Binds a buffer object to a binding point.
+ *
+ * The caller is responsible for validating the offset,
+ * flushing the vertices and updating NewDriverState.
  */
 static void
-create_buffers(GLsizei n, GLuint *buffers, bool dsa)
+set_buffer_binding(struct gl_context *ctx,
+                   struct gl_buffer_binding *binding,
+                   struct gl_buffer_object *bufObj,
+                   GLintptr offset,
+                   GLsizeiptr size,
+                   bool autoSize, gl_buffer_usage usage)
 {
-   GET_CURRENT_CONTEXT(ctx);
-   GLuint first;
-   GLint i;
-   struct gl_buffer_object *buf;
+   _mesa_reference_buffer_object(ctx, &binding->BufferObject, bufObj);
 
-   const char *func = dsa ? "glCreateBuffers" : "glGenBuffers";
+   binding->Offset = offset;
+   binding->Size = size;
+   binding->AutomaticSize = autoSize;
 
-   if (MESA_VERBOSE & VERBOSE_API)
-      _mesa_debug(ctx, "%s(%d)\n", func, n);
+   /* If this is a real buffer object, mark it has having been used
+    * at some point as an atomic counter buffer.
+    */
+   if (size >= 0)
+      bufObj->UsageHistory |= usage;
+}
 
-   if (n < 0) {
-      _mesa_error(ctx, GL_INVALID_VALUE, "%s(n %d < 0)", func, n);
-      return;
+static void
+set_buffer_multi_binding(struct gl_context *ctx,
+                         const GLuint *buffers,
+                         int idx,
+                         const char *caller,
+                         struct gl_buffer_binding *binding,
+                         GLintptr offset,
+                         GLsizeiptr size,
+                         bool range,
+                         gl_buffer_usage usage)
+{
+   struct gl_buffer_object *bufObj;
+
+   if (binding->BufferObject && binding->BufferObject->Name == buffers[idx])
+      bufObj = binding->BufferObject;
+   else {
+      bool error;
+      bufObj = _mesa_multi_bind_lookup_bufferobj(ctx, buffers, idx, caller,
+                                                 &error);
+      if (error)
+         return;
    }
 
-   if (!buffers) {
+   if (!bufObj)
+      set_buffer_binding(ctx, binding, bufObj, -1, -1, !range, usage);
+   else
+      set_buffer_binding(ctx, binding, bufObj, offset, size, !range, usage);
+}
+
+static void
+bind_buffer(struct gl_context *ctx,
+            struct gl_buffer_binding *binding,
+            struct gl_buffer_object *bufObj,
+            GLintptr offset,
+            GLsizeiptr size,
+            GLboolean autoSize,
+            uint64_t driver_state,
+            gl_buffer_usage usage)
+{
+   if (binding->BufferObject == bufObj &&
+       binding->Offset == offset &&
+       binding->Size == size &&
+       binding->AutomaticSize == autoSize) {
       return;
    }
 
+   FLUSH_VERTICES(ctx, 0);
+   ctx->NewDriverState |= driver_state;
+
+   set_buffer_binding(ctx, binding, bufObj, offset, size, autoSize, usage);
+}
+
+/**
+ * Binds a buffer object to a uniform buffer binding point.
+ *
+ * Unlike set_buffer_binding(), this function also flushes vertices
+ * and updates NewDriverState.  It also checks if the binding
+ * has actually changed before updating it.
+ */
+static void
+bind_uniform_buffer(struct gl_context *ctx,
+                    GLuint index,
+                    struct gl_buffer_object *bufObj,
+                    GLintptr offset,
+                    GLsizeiptr size,
+                    GLboolean autoSize)
+{
+   bind_buffer(ctx, &ctx->UniformBufferBindings[index],
+               bufObj, offset, size, autoSize,
+               ctx->DriverFlags.NewUniformBuffer,
+               USAGE_UNIFORM_BUFFER);
+}
+
+/**
+ * Binds a buffer object to a shader storage buffer binding point.
+ *
+ * Unlike set_ssbo_binding(), this function also flushes vertices
+ * and updates NewDriverState.  It also checks if the binding
+ * has actually changed before updating it.
+ */
+static void
+bind_shader_storage_buffer(struct gl_context *ctx,
+                           GLuint index,
+                           struct gl_buffer_object *bufObj,
+                           GLintptr offset,
+                           GLsizeiptr size,
+                           GLboolean autoSize)
+{
+   bind_buffer(ctx, &ctx->ShaderStorageBufferBindings[index],
+               bufObj, offset, size, autoSize,
+               ctx->DriverFlags.NewShaderStorageBuffer,
+               USAGE_SHADER_STORAGE_BUFFER);
+}
+
+/**
+ * Binds a buffer object to an atomic buffer binding point.
+ *
+ * Unlike set_atomic_binding(), this function also flushes vertices
+ * and updates NewDriverState.  It also checks if the binding
+ * has actually changed before updating it.
+ */
+static void
+bind_atomic_buffer(struct gl_context *ctx, unsigned index,
+                   struct gl_buffer_object *bufObj, GLintptr offset,
+                   GLsizeiptr size, GLboolean autoSize)
+{
+   bind_buffer(ctx, &ctx->AtomicBufferBindings[index],
+               bufObj, offset, size, autoSize,
+               ctx->DriverFlags.NewAtomicBuffer,
+               USAGE_ATOMIC_COUNTER_BUFFER);
+}
+
+/**
+ * Bind a buffer object to a uniform block binding point.
+ * As above, but offset = 0.
+ */
+static void
+bind_buffer_base_uniform_buffer(struct gl_context *ctx,
+                               GLuint index,
+                               struct gl_buffer_object *bufObj)
+{
+   if (index >= ctx->Const.MaxUniformBufferBindings) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferBase(index=%d)", index);
+      return;
+   }
+
+   _mesa_reference_buffer_object(ctx, &ctx->UniformBuffer, bufObj);
+
+   if (!bufObj)
+      bind_uniform_buffer(ctx, index, bufObj, -1, -1, GL_TRUE);
+   else
+      bind_uniform_buffer(ctx, index, bufObj, 0, 0, GL_TRUE);
+}
+
+/**
+ * Bind a buffer object to a shader storage block binding point.
+ * As above, but offset = 0.
+ */
+static void
+bind_buffer_base_shader_storage_buffer(struct gl_context *ctx,
+                                       GLuint index,
+                                       struct gl_buffer_object *bufObj)
+{
+   if (index >= ctx->Const.MaxShaderStorageBufferBindings) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferBase(index=%d)", index);
+      return;
+   }
+
+   _mesa_reference_buffer_object(ctx, &ctx->ShaderStorageBuffer, bufObj);
+
+   if (!bufObj)
+      bind_shader_storage_buffer(ctx, index, bufObj, -1, -1, GL_TRUE);
+   else
+      bind_shader_storage_buffer(ctx, index, bufObj, 0, 0, GL_TRUE);
+}
+
+/**
+ * Bind a buffer object to a shader storage block binding point.
+ * As above, but offset = 0.
+ */
+static void
+bind_buffer_base_atomic_buffer(struct gl_context *ctx,
+                               GLuint index,
+                               struct gl_buffer_object *bufObj)
+{
+   if (index >= ctx->Const.MaxAtomicBufferBindings) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferBase(index=%d)", index);
+      return;
+   }
+
+   _mesa_reference_buffer_object(ctx, &ctx->AtomicBuffer, bufObj);
+
+   if (!bufObj)
+      bind_atomic_buffer(ctx, index, bufObj, -1, -1, GL_TRUE);
+   else
+      bind_atomic_buffer(ctx, index, bufObj, 0, 0, GL_TRUE);
+}
+
+/**
+ * Delete a set of buffer objects.
+ *
+ * \param n      Number of buffer objects to delete.
+ * \param ids    Array of \c n buffer object IDs.
+ */
+static void
+delete_buffers(struct gl_context *ctx, GLsizei n, const GLuint *ids)
+{
+   FLUSH_VERTICES(ctx, 0);
+
+   _mesa_HashLockMutex(ctx->Shared->BufferObjects);
+
+   for (GLsizei i = 0; i < n; i++) {
+      struct gl_buffer_object *bufObj =
+         _mesa_lookup_bufferobj_locked(ctx, ids[i]);
+      if (bufObj) {
+         struct gl_vertex_array_object *vao = ctx->Array.VAO;
+         GLuint j;
+
+         assert(bufObj->Name == ids[i] || bufObj == &DummyBufferObject);
+
+         _mesa_buffer_unmap_all_mappings(ctx, bufObj);
+
+         /* unbind any vertex pointers bound to this buffer */
+         for (j = 0; j < ARRAY_SIZE(vao->BufferBinding); j++) {
+            unbind(ctx, vao, j, bufObj);
+         }
+
+         if (ctx->Array.ArrayBufferObj == bufObj) {
+            bind_buffer_object(ctx, &ctx->Array.ArrayBufferObj, 0);
+         }
+         if (vao->IndexBufferObj == bufObj) {
+            bind_buffer_object(ctx, &vao->IndexBufferObj, 0);
+         }
+
+         /* unbind ARB_draw_indirect binding point */
+         if (ctx->DrawIndirectBuffer == bufObj) {
+            bind_buffer_object(ctx, &ctx->DrawIndirectBuffer, 0);
+         }
+
+         /* unbind ARB_indirect_parameters binding point */
+         if (ctx->ParameterBuffer == bufObj) {
+            bind_buffer_object(ctx, &ctx->ParameterBuffer, 0);
+         }
+
+         /* unbind ARB_compute_shader binding point */
+         if (ctx->DispatchIndirectBuffer == bufObj) {
+            bind_buffer_object(ctx, &ctx->DispatchIndirectBuffer, 0);
+         }
+
+         /* unbind ARB_copy_buffer binding points */
+         if (ctx->CopyReadBuffer == bufObj) {
+            bind_buffer_object(ctx, &ctx->CopyReadBuffer, 0);
+         }
+         if (ctx->CopyWriteBuffer == bufObj) {
+            bind_buffer_object(ctx, &ctx->CopyWriteBuffer, 0);
+         }
+
+         /* unbind transform feedback binding points */
+         if (ctx->TransformFeedback.CurrentBuffer == bufObj) {
+            bind_buffer_object(ctx, &ctx->TransformFeedback.CurrentBuffer, 0);
+         }
+         for (j = 0; j < MAX_FEEDBACK_BUFFERS; j++) {
+            if (ctx->TransformFeedback.CurrentObject->Buffers[j] == bufObj) {
+               _mesa_bind_buffer_base_transform_feedback(ctx,
+                                           ctx->TransformFeedback.CurrentObject,
+                                           j, NULL, false);
+            }
+         }
+
+         /* unbind UBO binding points */
+         for (j = 0; j < ctx->Const.MaxUniformBufferBindings; j++) {
+            if (ctx->UniformBufferBindings[j].BufferObject == bufObj) {
+               bind_buffer_base_uniform_buffer(ctx, j, NULL);
+            }
+         }
+
+         if (ctx->UniformBuffer == bufObj) {
+            bind_buffer_object(ctx, &ctx->UniformBuffer, 0);
+         }
+
+         /* unbind SSBO binding points */
+         for (j = 0; j < ctx->Const.MaxShaderStorageBufferBindings; j++) {
+            if (ctx->ShaderStorageBufferBindings[j].BufferObject == bufObj) {
+               bind_buffer_base_shader_storage_buffer(ctx, j, NULL);
+            }
+         }
+
+         if (ctx->ShaderStorageBuffer == bufObj) {
+            bind_buffer_object(ctx, &ctx->ShaderStorageBuffer, 0);
+         }
+
+         /* unbind Atomci Buffer binding points */
+         for (j = 0; j < ctx->Const.MaxAtomicBufferBindings; j++) {
+            if (ctx->AtomicBufferBindings[j].BufferObject == bufObj) {
+               bind_buffer_base_atomic_buffer(ctx, j, NULL);
+            }
+         }
+
+         if (ctx->AtomicBuffer == bufObj) {
+            bind_buffer_object(ctx, &ctx->AtomicBuffer, 0);
+         }
+
+         /* unbind any pixel pack/unpack pointers bound to this buffer */
+         if (ctx->Pack.BufferObj == bufObj) {
+            bind_buffer_object(ctx, &ctx->Pack.BufferObj, 0);
+         }
+         if (ctx->Unpack.BufferObj == bufObj) {
+            bind_buffer_object(ctx, &ctx->Unpack.BufferObj, 0);
+         }
+
+         if (ctx->Texture.BufferObject == bufObj) {
+            bind_buffer_object(ctx, &ctx->Texture.BufferObject, 0);
+         }
+
+         if (ctx->ExternalVirtualMemoryBuffer == bufObj) {
+            bind_buffer_object(ctx, &ctx->ExternalVirtualMemoryBuffer, 0);
+         }
+
+         /* unbind query buffer binding point */
+         if (ctx->QueryBuffer == bufObj) {
+            bind_buffer_object(ctx, &ctx->QueryBuffer, 0);
+         }
+
+         /* The ID is immediately freed for re-use */
+         _mesa_HashRemoveLocked(ctx->Shared->BufferObjects, ids[i]);
+         /* Make sure we do not run into the classic ABA problem on bind.
+          * We don't want to allow re-binding a buffer object that's been
+          * "deleted" by glDeleteBuffers().
+          *
+          * The explicit rebinding to the default object in the current context
+          * prevents the above in the current context, but another context
+          * sharing the same objects might suffer from this problem.
+          * The alternative would be to do the hash lookup in any case on bind
+          * which would introduce more runtime overhead than this.
+          */
+         bufObj->DeletePending = GL_TRUE;
+         _mesa_reference_buffer_object(ctx, &bufObj, NULL);
+      }
+   }
+
+   _mesa_HashUnlockMutex(ctx->Shared->BufferObjects);
+}
+
+
+void GLAPIENTRY
+_mesa_DeleteBuffers_no_error(GLsizei n, const GLuint *ids)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   delete_buffers(ctx, n, ids);
+}
+
+
+void GLAPIENTRY
+_mesa_DeleteBuffers(GLsizei n, const GLuint *ids)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (n < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteBuffersARB(n)");
+      return;
+   }
+
+   delete_buffers(ctx, n, ids);
+}
+
+
+/**
+ * This is the implementation for glGenBuffers and glCreateBuffers. It is not
+ * exposed to the rest of Mesa to encourage the use of nameless buffers in
+ * driver internals.
+ */
+static void
+create_buffers(struct gl_context *ctx, GLsizei n, GLuint *buffers, bool dsa)
+{
+   GLuint first;
+   struct gl_buffer_object *buf;
+
+   if (!buffers)
+      return;
+
    /*
     * This must be atomic (generation and allocation of buffer object IDs)
     */
-   mtx_lock(&ctx->Shared->Mutex);
+   _mesa_HashLockMutex(ctx->Shared->BufferObjects);
 
    first = _mesa_HashFindFreeKeyBlock(ctx->Shared->BufferObjects, n);
 
@@ -1324,23 +1626,41 @@ create_buffers(GLsizei n, GLuint *buffers, bool dsa)
     * DummyBufferObject.  Otherwise, create a new buffer object and insert
     * it.
     */
-   for (i = 0; i < n; i++) {
+   for (int i = 0; i < n; i++) {
       buffers[i] = first + i;
       if (dsa) {
          assert(ctx->Driver.NewBufferObject);
          buf = ctx->Driver.NewBufferObject(ctx, buffers[i]);
          if (!buf) {
-            _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func);
+            _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCreateBuffers");
+            _mesa_HashUnlockMutex(ctx->Shared->BufferObjects);
             return;
          }
       }
       else
          buf = &DummyBufferObject;
 
-      _mesa_HashInsert(ctx->Shared->BufferObjects, buffers[i], buf);
+      _mesa_HashInsertLocked(ctx->Shared->BufferObjects, buffers[i], buf);
+   }
+
+   _mesa_HashUnlockMutex(ctx->Shared->BufferObjects);
+}
+
+
+static void
+create_buffers_err(struct gl_context *ctx, GLsizei n, GLuint *buffers, bool dsa)
+{
+   const char *func = dsa ? "glCreateBuffers" : "glGenBuffers";
+
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(ctx, "%s(%d)\n", func, n);
+
+   if (n < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "%s(n %d < 0)", func, n);
+      return;
    }
 
-   mtx_unlock(&ctx->Shared->Mutex);
+   create_buffers(ctx, n, buffers, dsa);
 }
 
 /**
@@ -1349,10 +1669,19 @@ create_buffers(GLsizei n, GLuint *buffers, bool dsa)
  * \param n        Number of IDs to generate.
  * \param buffers  Array of \c n locations to store the IDs.
  */
+void GLAPIENTRY
+_mesa_GenBuffers_no_error(GLsizei n, GLuint *buffers)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   create_buffers(ctx, n, buffers, false);
+}
+
+
 void GLAPIENTRY
 _mesa_GenBuffers(GLsizei n, GLuint *buffers)
 {
-   create_buffers(n, buffers, false);
+   GET_CURRENT_CONTEXT(ctx);
+   create_buffers_err(ctx, n, buffers, false);
 }
 
 /**
@@ -1361,18 +1690,27 @@ _mesa_GenBuffers(GLsizei n, GLuint *buffers)
  * \param n        Number of IDs to generate.
  * \param buffers  Array of \c n locations to store the IDs.
  */
+void GLAPIENTRY
+_mesa_CreateBuffers_no_error(GLsizei n, GLuint *buffers)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   create_buffers(ctx, n, buffers, true);
+}
+
+
 void GLAPIENTRY
 _mesa_CreateBuffers(GLsizei n, GLuint *buffers)
 {
-   create_buffers(n, buffers, true);
+   GET_CURRENT_CONTEXT(ctx);
+   create_buffers_err(ctx, n, buffers, true);
 }
 
 
 /**
  * Determine if ID is the name of a buffer object.
- * 
+ *
  * \param id  ID of the potential buffer object.
- * \return  \c GL_TRUE if \c id is the name of a buffer object, 
+ * \return  \c GL_TRUE if \c id is the name of a buffer object,
  *          \c GL_FALSE otherwise.
  */
 GLboolean GLAPIENTRY
@@ -1382,63 +1720,100 @@ _mesa_IsBuffer(GLuint id)
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 
-   mtx_lock(&ctx->Shared->Mutex);
    bufObj = _mesa_lookup_bufferobj(ctx, id);
-   mtx_unlock(&ctx->Shared->Mutex);
 
    return bufObj && bufObj != &DummyBufferObject;
 }
 
 
-void
-_mesa_buffer_storage(struct gl_context *ctx, struct gl_buffer_object *bufObj,
-                     GLenum target, GLsizeiptr size, const GLvoid *data,
-                     GLbitfield flags, const char *func)
+static bool
+validate_buffer_storage(struct gl_context *ctx,
+                        struct gl_buffer_object *bufObj, GLsizeiptr size,
+                        GLbitfield flags, const char *func)
 {
    if (size <= 0) {
       _mesa_error(ctx, GL_INVALID_VALUE, "%s(size <= 0)", func);
-      return;
+      return false;
    }
 
-   if (flags & ~(GL_MAP_READ_BIT |
-                 GL_MAP_WRITE_BIT |
-                 GL_MAP_PERSISTENT_BIT |
-                 GL_MAP_COHERENT_BIT |
-                 GL_DYNAMIC_STORAGE_BIT |
-                 GL_CLIENT_STORAGE_BIT)) {
+   GLbitfield valid_flags = GL_MAP_READ_BIT |
+                            GL_MAP_WRITE_BIT |
+                            GL_MAP_PERSISTENT_BIT |
+                            GL_MAP_COHERENT_BIT |
+                            GL_DYNAMIC_STORAGE_BIT |
+                            GL_CLIENT_STORAGE_BIT;
+
+   if (ctx->Extensions.ARB_sparse_buffer)
+      valid_flags |= GL_SPARSE_STORAGE_BIT_ARB;
+
+   if (flags & ~valid_flags) {
       _mesa_error(ctx, GL_INVALID_VALUE, "%s(invalid flag bits set)", func);
-      return;
+      return false;
+   }
+
+   /* The Errors section of the GL_ARB_sparse_buffer spec says:
+    *
+    *    "INVALID_VALUE is generated by BufferStorage if <flags> contains
+    *     SPARSE_STORAGE_BIT_ARB and <flags> also contains any combination of
+    *     MAP_READ_BIT or MAP_WRITE_BIT."
+    */
+   if (flags & GL_SPARSE_STORAGE_BIT_ARB &&
+       flags & (GL_MAP_READ_BIT | GL_MAP_WRITE_BIT)) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "%s(SPARSE_STORAGE and READ/WRITE)", func);
+      return false;
    }
 
    if (flags & GL_MAP_PERSISTENT_BIT &&
        !(flags & (GL_MAP_READ_BIT | GL_MAP_WRITE_BIT))) {
       _mesa_error(ctx, GL_INVALID_VALUE,
                   "%s(PERSISTENT and flags!=READ/WRITE)", func);
-      return;
+      return false;
    }
 
    if (flags & GL_MAP_COHERENT_BIT && !(flags & GL_MAP_PERSISTENT_BIT)) {
       _mesa_error(ctx, GL_INVALID_VALUE,
                   "%s(COHERENT and flags!=PERSISTENT)", func);
-      return;
+      return false;
    }
 
-   if (bufObj->Immutable) {
+   if (bufObj->Immutable || bufObj->HandleAllocated) {
       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(immutable)", func);
-      return;
+      return false;
    }
 
+   return true;
+}
+
+
+static void
+buffer_storage(struct gl_context *ctx, struct gl_buffer_object *bufObj,
+               struct gl_memory_object *memObj, GLenum target,
+               GLsizeiptr size, const GLvoid *data, GLbitfield flags,
+               GLuint64 offset, const char *func)
+{
+   GLboolean res;
+
    /* Unmap the existing buffer.  We'll replace it now.  Not an error. */
    _mesa_buffer_unmap_all_mappings(ctx, bufObj);
 
-   FLUSH_VERTICES(ctx, _NEW_BUFFER_OBJECT);
+   FLUSH_VERTICES(ctx, 0);
 
    bufObj->Written = GL_TRUE;
    bufObj->Immutable = GL_TRUE;
+   bufObj->MinMaxCacheDirty = true;
 
-   assert(ctx->Driver.BufferData);
-   if (!ctx->Driver.BufferData(ctx, target, size, data, GL_DYNAMIC_DRAW,
-                               flags, bufObj)) {
+   if (memObj) {
+      assert(ctx->Driver.BufferDataMem);
+      res = ctx->Driver.BufferDataMem(ctx, target, size, memObj, offset,
+                                      GL_DYNAMIC_DRAW, bufObj);
+   }
+   else {
+      assert(ctx->Driver.BufferData);
+      res = ctx->Driver.BufferData(ctx, target, size, data, GL_DYNAMIC_DRAW,
+                                   flags, bufObj);
+   }
+
+   if (!res) {
       if (target == GL_EXTERNAL_VIRTUAL_MEMORY_BUFFER_AMD) {
          /* Even though the interaction between AMD_pinned_memory and
           * glBufferStorage is not described in the spec, Graham Sellers
@@ -1452,101 +1827,227 @@ _mesa_buffer_storage(struct gl_context *ctx, struct gl_buffer_object *bufObj,
    }
 }
 
+
+static ALWAYS_INLINE void
+inlined_buffer_storage(GLenum target, GLuint buffer, GLsizeiptr size,
+                       const GLvoid *data, GLbitfield flags,
+                       GLuint memory, GLuint64 offset,
+                       bool dsa, bool mem, bool no_error, const char *func)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
+   struct gl_memory_object *memObj = NULL;
+
+   if (mem) {
+      if (!no_error) {
+         if (!ctx->Extensions.EXT_memory_object) {
+            _mesa_error(ctx, GL_INVALID_OPERATION, "%s(unsupported)", func);
+            return;
+         }
+
+         /* From the EXT_external_objects spec:
+          *
+          *   "An INVALID_VALUE error is generated by BufferStorageMemEXT and
+          *   NamedBufferStorageMemEXT if <memory> is 0, or ..."
+          */
+         if (memory == 0) {
+            _mesa_error(ctx, GL_INVALID_VALUE, "%s(memory == 0)", func);
+         }
+      }
+
+      memObj = _mesa_lookup_memory_object(ctx, memory);
+      if (!memObj)
+         return;
+
+      /* From the EXT_external_objects spec:
+       *
+       *   "An INVALID_OPERATION error is generated if <memory> names a
+       *   valid memory object which has no associated memory."
+       */
+      if (!no_error && !memObj->Immutable) {
+         _mesa_error(ctx, GL_INVALID_OPERATION, "%s(no associated memory)",
+                     func);
+         return;
+      }
+   }
+
+   if (dsa) {
+      if (no_error) {
+         bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+      } else {
+         bufObj = _mesa_lookup_bufferobj_err(ctx, buffer, func);
+         if (!bufObj)
+            return;
+      }
+   } else {
+      if (no_error) {
+         struct gl_buffer_object **bufObjPtr = get_buffer_target(ctx, target);
+         bufObj = *bufObjPtr;
+      } else {
+         bufObj = get_buffer(ctx, func, target, GL_INVALID_OPERATION);
+         if (!bufObj)
+            return;
+      }
+   }
+
+   if (no_error || validate_buffer_storage(ctx, bufObj, size, flags, func))
+      buffer_storage(ctx, bufObj, memObj, target, size, data, flags, offset, func);
+}
+
+
+void GLAPIENTRY
+_mesa_BufferStorage_no_error(GLenum target, GLsizeiptr size,
+                             const GLvoid *data, GLbitfield flags)
+{
+   inlined_buffer_storage(target, 0, size, data, flags, GL_NONE, 0,
+                          false, false, true, "glBufferStorage");
+}
+
+
 void GLAPIENTRY
 _mesa_BufferStorage(GLenum target, GLsizeiptr size, const GLvoid *data,
                     GLbitfield flags)
+{
+   inlined_buffer_storage(target, 0, size, data, flags, GL_NONE, 0,
+                          false, false, false, "glBufferStorage");
+}
+
+void GLAPIENTRY
+_mesa_NamedBufferStorageEXT(GLuint buffer, GLsizeiptr size,
+                            const GLvoid *data, GLbitfield flags)
 {
    GET_CURRENT_CONTEXT(ctx);
-   struct gl_buffer_object *bufObj;
 
-   bufObj = get_buffer(ctx, "glBufferStorage", target, GL_INVALID_OPERATION);
-   if (!bufObj)
+   struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
+                                     &bufObj, "glNamedBufferStorageEXT"))
       return;
 
-   _mesa_buffer_storage(ctx, bufObj, target, size, data, flags,
-                        "glBufferStorage");
+   inlined_buffer_storage(GL_NONE, buffer, size, data, flags, GL_NONE, 0,
+                          true, false, false, "glNamedBufferStorageEXT");
+}
+
+
+void GLAPIENTRY
+_mesa_BufferStorageMemEXT(GLenum target, GLsizeiptr size,
+                          GLuint memory, GLuint64 offset)
+{
+   inlined_buffer_storage(target, 0, size, NULL, 0, memory, offset,
+                          false, true, false, "glBufferStorageMemEXT");
+}
+
+
+void GLAPIENTRY
+_mesa_BufferStorageMemEXT_no_error(GLenum target, GLsizeiptr size,
+                                   GLuint memory, GLuint64 offset)
+{
+   inlined_buffer_storage(target, 0, size, NULL, 0, memory, offset,
+                          false, true, true, "glBufferStorageMemEXT");
+}
+
+
+void GLAPIENTRY
+_mesa_NamedBufferStorage_no_error(GLuint buffer, GLsizeiptr size,
+                                  const GLvoid *data, GLbitfield flags)
+{
+   /* In direct state access, buffer objects have an unspecified target
+    * since they are not required to be bound.
+    */
+   inlined_buffer_storage(GL_NONE, buffer, size, data, flags, GL_NONE, 0,
+                          true, false, true, "glNamedBufferStorage");
 }
 
+
 void GLAPIENTRY
 _mesa_NamedBufferStorage(GLuint buffer, GLsizeiptr size, const GLvoid *data,
                          GLbitfield flags)
 {
-   GET_CURRENT_CONTEXT(ctx);
-   struct gl_buffer_object *bufObj;
+   /* In direct state access, buffer objects have an unspecified target
+    * since they are not required to be bound.
+    */
+   inlined_buffer_storage(GL_NONE, buffer, size, data, flags, GL_NONE, 0,
+                          true, false, false, "glNamedBufferStorage");
+}
 
-   bufObj = _mesa_lookup_bufferobj_err(ctx, buffer, "glNamedBufferStorage");
-   if (!bufObj)
-      return;
+void GLAPIENTRY
+_mesa_NamedBufferStorageMemEXT(GLuint buffer, GLsizeiptr size,
+                               GLuint memory, GLuint64 offset)
+{
+   inlined_buffer_storage(GL_NONE, buffer, size, GL_NONE, 0, memory, offset,
+                          true, true, false, "glNamedBufferStorageMemEXT");
+}
 
-   /*
-    * In direct state access, buffer objects have an unspecified target since
-    * they are not required to be bound.
-    */
-   _mesa_buffer_storage(ctx, bufObj, GL_NONE, size, data, flags,
-                        "glNamedBufferStorage");
+
+void GLAPIENTRY
+_mesa_NamedBufferStorageMemEXT_no_error(GLuint buffer, GLsizeiptr size,
+                                        GLuint memory, GLuint64 offset)
+{
+   inlined_buffer_storage(GL_NONE, buffer, size, GL_NONE, 0, memory, offset,
+                          true, true, true, "glNamedBufferStorageMemEXT");
 }
 
 
-void
-_mesa_buffer_data(struct gl_context *ctx, struct gl_buffer_object *bufObj,
-                  GLenum target, GLsizeiptr size, const GLvoid *data,
-                  GLenum usage, const char *func)
+static ALWAYS_INLINE void
+buffer_data(struct gl_context *ctx, struct gl_buffer_object *bufObj,
+            GLenum target, GLsizeiptr size, const GLvoid *data, GLenum usage,
+            const char *func, bool no_error)
 {
    bool valid_usage;
 
-   if (MESA_VERBOSE & VERBOSE_API)
+   if (MESA_VERBOSE & VERBOSE_API) {
       _mesa_debug(ctx, "%s(%s, %ld, %p, %s)\n",
                   func,
-                  _mesa_lookup_enum_by_nr(target),
+                  _mesa_enum_to_string(target),
                   (long int) size, data,
-                  _mesa_lookup_enum_by_nr(usage));
-
-   if (size < 0) {
-      _mesa_error(ctx, GL_INVALID_VALUE, "%s(size < 0)", func);
-      return;
+                  _mesa_enum_to_string(usage));
    }
 
-   switch (usage) {
-   case GL_STREAM_DRAW_ARB:
-      valid_usage = (ctx->API != API_OPENGLES);
-      break;
-
-   case GL_STATIC_DRAW_ARB:
-   case GL_DYNAMIC_DRAW_ARB:
-      valid_usage = true;
-      break;
-
-   case GL_STREAM_READ_ARB:
-   case GL_STREAM_COPY_ARB:
-   case GL_STATIC_READ_ARB:
-   case GL_STATIC_COPY_ARB:
-   case GL_DYNAMIC_READ_ARB:
-   case GL_DYNAMIC_COPY_ARB:
-      valid_usage = _mesa_is_desktop_gl(ctx) || _mesa_is_gles3(ctx);
-      break;
+   if (!no_error) {
+      if (size < 0) {
+         _mesa_error(ctx, GL_INVALID_VALUE, "%s(size < 0)", func);
+         return;
+      }
 
-   default:
-      valid_usage = false;
-      break;
-   }
+      switch (usage) {
+      case GL_STREAM_DRAW_ARB:
+         valid_usage = (ctx->API != API_OPENGLES);
+         break;
+      case GL_STATIC_DRAW_ARB:
+      case GL_DYNAMIC_DRAW_ARB:
+         valid_usage = true;
+         break;
+      case GL_STREAM_READ_ARB:
+      case GL_STREAM_COPY_ARB:
+      case GL_STATIC_READ_ARB:
+      case GL_STATIC_COPY_ARB:
+      case GL_DYNAMIC_READ_ARB:
+      case GL_DYNAMIC_COPY_ARB:
+         valid_usage = _mesa_is_desktop_gl(ctx) || _mesa_is_gles3(ctx);
+         break;
+      default:
+         valid_usage = false;
+         break;
+      }
 
-   if (!valid_usage) {
-      _mesa_error(ctx, GL_INVALID_ENUM, "%s(invalid usage: %s)", func,
-                  _mesa_lookup_enum_by_nr(usage));
-      return;
-   }
+      if (!valid_usage) {
+         _mesa_error(ctx, GL_INVALID_ENUM, "%s(invalid usage: %s)", func,
+                     _mesa_enum_to_string(usage));
+         return;
+      }
 
-   if (bufObj->Immutable) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "%s(immutable)", func);
-      return;
+      if (bufObj->Immutable || bufObj->HandleAllocated) {
+         _mesa_error(ctx, GL_INVALID_OPERATION, "%s(immutable)", func);
+         return;
+      }
    }
 
    /* Unmap the existing buffer.  We'll replace it now.  Not an error. */
    _mesa_buffer_unmap_all_mappings(ctx, bufObj);
 
-   FLUSH_VERTICES(ctx, _NEW_BUFFER_OBJECT);
+   FLUSH_VERTICES(ctx, 0);
 
    bufObj->Written = GL_TRUE;
+   bufObj->MinMaxCacheDirty = true;
 
 #ifdef VBO_DEBUG
    printf("glBufferDataARB(%u, sz %ld, from %p, usage 0x%x)\n",
@@ -1564,20 +2065,56 @@ _mesa_buffer_data(struct gl_context *ctx, struct gl_buffer_object *bufObj,
                                GL_DYNAMIC_STORAGE_BIT,
                                bufObj)) {
       if (target == GL_EXTERNAL_VIRTUAL_MEMORY_BUFFER_AMD) {
-         /* From GL_AMD_pinned_memory:
-          *
-          *   INVALID_OPERATION is generated by BufferData if <target> is
-          *   EXTERNAL_VIRTUAL_MEMORY_BUFFER_AMD, and the store cannot be
-          *   mapped to the GPU address space.
-          */
-         _mesa_error(ctx, GL_INVALID_OPERATION, "%s", func);
-      }
-      else {
+         if (!no_error) {
+            /* From GL_AMD_pinned_memory:
+             *
+             *   INVALID_OPERATION is generated by BufferData if <target> is
+             *   EXTERNAL_VIRTUAL_MEMORY_BUFFER_AMD, and the store cannot be
+             *   mapped to the GPU address space.
+             */
+            _mesa_error(ctx, GL_INVALID_OPERATION, "%s", func);
+         }
+      } else {
          _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func);
       }
    }
 }
 
+static void
+buffer_data_error(struct gl_context *ctx, struct gl_buffer_object *bufObj,
+                  GLenum target, GLsizeiptr size, const GLvoid *data,
+                  GLenum usage, const char *func)
+{
+   buffer_data(ctx, bufObj, target, size, data, usage, func, false);
+}
+
+static void
+buffer_data_no_error(struct gl_context *ctx, struct gl_buffer_object *bufObj,
+                     GLenum target, GLsizeiptr size, const GLvoid *data,
+                     GLenum usage, const char *func)
+{
+   buffer_data(ctx, bufObj, target, size, data, usage, func, true);
+}
+
+void
+_mesa_buffer_data(struct gl_context *ctx, struct gl_buffer_object *bufObj,
+                  GLenum target, GLsizeiptr size, const GLvoid *data,
+                  GLenum usage, const char *func)
+{
+   buffer_data_error(ctx, bufObj, target, size, data, usage, func);
+}
+
+void GLAPIENTRY
+_mesa_BufferData_no_error(GLenum target, GLsizeiptr size, const GLvoid *data,
+                          GLenum usage)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   struct gl_buffer_object **bufObj = get_buffer_target(ctx, target);
+   buffer_data_no_error(ctx, *bufObj, target, size, data, usage,
+                        "glBufferData");
+}
+
 void GLAPIENTRY
 _mesa_BufferData(GLenum target, GLsizeiptr size,
                  const GLvoid *data, GLenum usage)
@@ -1593,6 +2130,17 @@ _mesa_BufferData(GLenum target, GLsizeiptr size,
                      "glBufferData");
 }
 
+void GLAPIENTRY
+_mesa_NamedBufferData_no_error(GLuint buffer, GLsizeiptr size,
+                               const GLvoid *data, GLenum usage)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   buffer_data_no_error(ctx, bufObj, GL_NONE, size, data, usage,
+                        "glNamedBufferData");
+}
+
 void GLAPIENTRY
 _mesa_NamedBufferData(GLuint buffer, GLsizeiptr size, const GLvoid *data,
                       GLenum usage)
@@ -1611,6 +2159,62 @@ _mesa_NamedBufferData(GLuint buffer, GLsizeiptr size, const GLvoid *data,
                      "glNamedBufferData");
 }
 
+void GLAPIENTRY
+_mesa_NamedBufferDataEXT(GLuint buffer, GLsizeiptr size, const GLvoid *data,
+                         GLenum usage)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
+
+   if (!buffer) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glNamedBufferDataEXT(buffer=0)");
+      return;
+   }
+
+   bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
+                                     &bufObj, "glNamedBufferDataEXT"))
+      return;
+
+   _mesa_buffer_data(ctx, bufObj, GL_NONE, size, data, usage,
+                     "glNamedBufferDataEXT");
+}
+
+static bool
+validate_buffer_sub_data(struct gl_context *ctx,
+                         struct gl_buffer_object *bufObj,
+                         GLintptr offset, GLsizeiptr size,
+                         const char *func)
+{
+   if (!buffer_object_subdata_range_good(ctx, bufObj, offset, size,
+                                         true, func)) {
+      /* error already recorded */
+      return false;
+   }
+
+   if (bufObj->Immutable &&
+       !(bufObj->StorageFlags & GL_DYNAMIC_STORAGE_BIT)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "%s", func);
+      return false;
+   }
+
+   if ((bufObj->Usage == GL_STATIC_DRAW ||
+        bufObj->Usage == GL_STATIC_COPY) &&
+       bufObj->NumSubDataCalls >= BUFFER_WARNING_CALL_COUNT - 1) {
+      /* If the application declared the buffer as static draw/copy or stream
+       * draw, it should not be frequently modified with glBufferSubData.
+       */
+      BUFFER_USAGE_WARNING(ctx,
+                           "using %s(buffer %u, offset %u, size %u) to "
+                           "update a %s buffer",
+                           func, bufObj->Name, offset, size,
+                           _mesa_enum_to_string(bufObj->Usage));
+   }
+
+   return true;
+}
+
 
 /**
  * Implementation for glBufferSubData and glNamedBufferSubData.
@@ -1625,124 +2229,228 @@ _mesa_NamedBufferData(GLuint buffer, GLsizeiptr size, const GLvoid *data,
  */
 void
 _mesa_buffer_sub_data(struct gl_context *ctx, struct gl_buffer_object *bufObj,
-                      GLintptr offset, GLsizeiptr size, const GLvoid *data,
-                      const char *func)
+                      GLintptr offset, GLsizeiptr size, const GLvoid *data)
 {
-   if (!buffer_object_subdata_range_good(ctx, bufObj, offset, size,
-                                         false, func)) {
-      /* error already recorded */
+   if (size == 0)
       return;
+
+   bufObj->NumSubDataCalls++;
+   bufObj->Written = GL_TRUE;
+   bufObj->MinMaxCacheDirty = true;
+
+   assert(ctx->Driver.BufferSubData);
+   ctx->Driver.BufferSubData(ctx, offset, size, data, bufObj);
+}
+
+
+static ALWAYS_INLINE void
+buffer_sub_data(GLenum target, GLuint buffer, GLintptr offset,
+                GLsizeiptr size, const GLvoid *data,
+                bool dsa, bool no_error, const char *func)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
+
+   if (dsa) {
+      if (no_error) {
+         bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+      } else {
+         bufObj = _mesa_lookup_bufferobj_err(ctx, buffer, func);
+         if (!bufObj)
+            return;
+      }
+   } else {
+      if (no_error) {
+         struct gl_buffer_object **bufObjPtr = get_buffer_target(ctx, target);
+         bufObj = *bufObjPtr;
+      } else {
+         bufObj = get_buffer(ctx, func, target, GL_INVALID_OPERATION);
+         if (!bufObj)
+            return;
+      }
    }
 
-   if (bufObj->Immutable &&
-       !(bufObj->StorageFlags & GL_DYNAMIC_STORAGE_BIT)) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, func);
+   if (no_error || validate_buffer_sub_data(ctx, bufObj, offset, size, func))
+      _mesa_buffer_sub_data(ctx, bufObj, offset, size, data);
+}
+
+
+void GLAPIENTRY
+_mesa_BufferSubData_no_error(GLenum target, GLintptr offset,
+                             GLsizeiptr size, const GLvoid *data)
+{
+   buffer_sub_data(target, 0, offset, size, data, false, true,
+                   "glBufferSubData");
+}
+
+
+void GLAPIENTRY
+_mesa_BufferSubData(GLenum target, GLintptr offset,
+                    GLsizeiptr size, const GLvoid *data)
+{
+   buffer_sub_data(target, 0, offset, size, data, false, false,
+                   "glBufferSubData");
+}
+
+void GLAPIENTRY
+_mesa_NamedBufferSubData_no_error(GLuint buffer, GLintptr offset,
+                                  GLsizeiptr size, const GLvoid *data)
+{
+   buffer_sub_data(0, buffer, offset, size, data, true, true,
+                   "glNamedBufferSubData");
+}
+
+void GLAPIENTRY
+_mesa_NamedBufferSubData(GLuint buffer, GLintptr offset,
+                         GLsizeiptr size, const GLvoid *data)
+{
+   buffer_sub_data(0, buffer, offset, size, data, true, false,
+                   "glNamedBufferSubData");
+}
+
+void GLAPIENTRY
+_mesa_NamedBufferSubDataEXT(GLuint buffer, GLintptr offset,
+                            GLsizeiptr size, const GLvoid *data)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
+
+   if (!buffer) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glNamedBufferSubDataEXT(buffer=0)");
       return;
    }
 
-   if (size == 0)
+   bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
+                                     &bufObj, "glNamedBufferSubDataEXT"))
       return;
 
-   bufObj->Written = GL_TRUE;
-
-   assert(ctx->Driver.BufferSubData);
-   ctx->Driver.BufferSubData(ctx, offset, size, data, bufObj);
+   if (validate_buffer_sub_data(ctx, bufObj, offset, size,
+                                "glNamedBufferSubDataEXT")) {
+      _mesa_buffer_sub_data(ctx, bufObj, offset, size, data);
+   }
 }
 
+
 void GLAPIENTRY
-_mesa_BufferSubData(GLenum target, GLintptr offset,
-                    GLsizeiptr size, const GLvoid *data)
+_mesa_GetBufferSubData(GLenum target, GLintptr offset,
+                       GLsizeiptr size, GLvoid *data)
 {
    GET_CURRENT_CONTEXT(ctx);
    struct gl_buffer_object *bufObj;
 
-   bufObj = get_buffer(ctx, "glBufferSubData", target, GL_INVALID_OPERATION);
+   bufObj = get_buffer(ctx, "glGetBufferSubData", target,
+                       GL_INVALID_OPERATION);
    if (!bufObj)
       return;
 
-   _mesa_buffer_sub_data(ctx, bufObj, offset, size, data, "glBufferSubData");
+   if (!buffer_object_subdata_range_good(ctx, bufObj, offset, size, false,
+                                         "glGetBufferSubData")) {
+      return;
+   }
+
+   assert(ctx->Driver.GetBufferSubData);
+   ctx->Driver.GetBufferSubData(ctx, offset, size, data, bufObj);
 }
 
 void GLAPIENTRY
-_mesa_NamedBufferSubData(GLuint buffer, GLintptr offset,
-                         GLsizeiptr size, const GLvoid *data)
+_mesa_GetNamedBufferSubData(GLuint buffer, GLintptr offset,
+                            GLsizeiptr size, GLvoid *data)
 {
    GET_CURRENT_CONTEXT(ctx);
    struct gl_buffer_object *bufObj;
 
-   bufObj = _mesa_lookup_bufferobj_err(ctx, buffer, "glNamedBufferSubData");
+   bufObj = _mesa_lookup_bufferobj_err(ctx, buffer,
+                                       "glGetNamedBufferSubData");
    if (!bufObj)
       return;
 
-   _mesa_buffer_sub_data(ctx, bufObj, offset, size, data,
-                         "glNamedBufferSubData");
+   if (!buffer_object_subdata_range_good(ctx, bufObj, offset, size, false,
+                                         "glGetNamedBufferSubData")) {
+      return;
+   }
+
+   assert(ctx->Driver.GetBufferSubData);
+   ctx->Driver.GetBufferSubData(ctx, offset, size, data, bufObj);
 }
 
 
 void GLAPIENTRY
-_mesa_GetBufferSubData(GLenum target, GLintptr offset,
-                       GLsizeiptr size, GLvoid *data)
+_mesa_GetNamedBufferSubDataEXT(GLuint buffer, GLintptr offset,
+                               GLsizeiptr size, GLvoid *data)
 {
    GET_CURRENT_CONTEXT(ctx);
    struct gl_buffer_object *bufObj;
 
-   bufObj = get_buffer(ctx, "glGetBufferSubData", target,
-                       GL_INVALID_OPERATION);
-   if (!bufObj)
+   if (!buffer) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glGetNamedBufferSubDataEXT(buffer=0)");
+      return;
+   }
+
+   bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
+                                     &bufObj, "glGetNamedBufferSubDataEXT"))
       return;
 
    if (!buffer_object_subdata_range_good(ctx, bufObj, offset, size, false,
-                                         "glGetBufferSubData")) {
+                                         "glGetNamedBufferSubDataEXT")) {
       return;
    }
 
    assert(ctx->Driver.GetBufferSubData);
-   ctx->Driver.GetBufferSubData( ctx, offset, size, data, bufObj );
+   ctx->Driver.GetBufferSubData(ctx, offset, size, data, bufObj);
 }
 
 /**
  * \param subdata   true if caller is *SubData, false if *Data
  */
-void
-_mesa_clear_buffer_sub_data(struct gl_context *ctx,
-                            struct gl_buffer_object *bufObj,
-                            GLenum internalformat,
-                            GLintptr offset, GLsizeiptr size,
-                            GLenum format, GLenum type,
-                            const GLvoid *data,
-                            const char *func, bool subdata)
+static ALWAYS_INLINE void
+clear_buffer_sub_data(struct gl_context *ctx, struct gl_buffer_object *bufObj,
+                      GLenum internalformat, GLintptr offset, GLsizeiptr size,
+                      GLenum format, GLenum type, const GLvoid *data,
+                      const char *func, bool subdata, bool no_error)
 {
    mesa_format mesaFormat;
    GLubyte clearValue[MAX_PIXEL_BYTES];
    GLsizeiptr clearValueSize;
 
    /* This checks for disallowed mappings. */
-   if (!buffer_object_subdata_range_good(ctx, bufObj, offset, size,
-                                         subdata, func)) {
+   if (!no_error && !buffer_object_subdata_range_good(ctx, bufObj, offset, size,
+                                                      subdata, func)) {
       return;
    }
 
-   mesaFormat = validate_clear_buffer_format(ctx, internalformat,
-                                             format, type, func);
+   if (no_error) {
+      mesaFormat = _mesa_get_texbuffer_format(ctx, internalformat);
+   } else {
+      mesaFormat = validate_clear_buffer_format(ctx, internalformat,
+                                                format, type, func);
+   }
 
-   if (mesaFormat == MESA_FORMAT_NONE) {
+   if (mesaFormat == MESA_FORMAT_NONE)
       return;
-   }
 
    clearValueSize = _mesa_get_format_bytes(mesaFormat);
-   if (offset % clearValueSize != 0 || size % clearValueSize != 0) {
+   if (!no_error &&
+       (offset % clearValueSize != 0 || size % clearValueSize != 0)) {
       _mesa_error(ctx, GL_INVALID_VALUE,
                   "%s(offset or size is not a multiple of "
                   "internalformat size)", func);
       return;
    }
 
+   /* Bail early. Negative size has already been checked. */
+   if (size == 0)
+      return;
+
+   bufObj->MinMaxCacheDirty = true;
+
    if (data == NULL) {
       /* clear to zeros, per the spec */
-      if (size > 0) {
-         ctx->Driver.ClearBufferSubData(ctx, offset, size,
-                                        NULL, clearValueSize, bufObj);
-      }
+      ctx->Driver.ClearBufferSubData(ctx, offset, size,
+                                     NULL, clearValueSize, bufObj);
       return;
    }
 
@@ -1751,12 +2459,48 @@ _mesa_clear_buffer_sub_data(struct gl_context *ctx,
       return;
    }
 
-   if (size > 0) {
-      ctx->Driver.ClearBufferSubData(ctx, offset, size,
-                                     clearValue, clearValueSize, bufObj);
-   }
+   ctx->Driver.ClearBufferSubData(ctx, offset, size,
+                                  clearValue, clearValueSize, bufObj);
+}
+
+static void
+clear_buffer_sub_data_error(struct gl_context *ctx,
+                            struct gl_buffer_object *bufObj,
+                            GLenum internalformat, GLintptr offset,
+                            GLsizeiptr size, GLenum format, GLenum type,
+                            const GLvoid *data, const char *func, bool subdata)
+{
+   clear_buffer_sub_data(ctx, bufObj, internalformat, offset, size, format,
+                         type, data, func, subdata, false);
+}
+
+
+static void
+clear_buffer_sub_data_no_error(struct gl_context *ctx,
+                               struct gl_buffer_object *bufObj,
+                               GLenum internalformat, GLintptr offset,
+                               GLsizeiptr size, GLenum format, GLenum type,
+                               const GLvoid *data, const char *func,
+                               bool subdata)
+{
+   clear_buffer_sub_data(ctx, bufObj, internalformat, offset, size, format,
+                         type, data, func, subdata, true);
+}
+
+
+void GLAPIENTRY
+_mesa_ClearBufferData_no_error(GLenum target, GLenum internalformat,
+                               GLenum format, GLenum type, const GLvoid *data)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   struct gl_buffer_object **bufObj = get_buffer_target(ctx, target);
+   clear_buffer_sub_data_no_error(ctx, *bufObj, internalformat, 0,
+                                  (*bufObj)->Size, format, type, data,
+                                  "glClearBufferData", false);
 }
 
+
 void GLAPIENTRY
 _mesa_ClearBufferData(GLenum target, GLenum internalformat, GLenum format,
                       GLenum type, const GLvoid *data)
@@ -1768,11 +2512,25 @@ _mesa_ClearBufferData(GLenum target, GLenum internalformat, GLenum format,
    if (!bufObj)
       return;
 
-   _mesa_clear_buffer_sub_data(ctx, bufObj, internalformat, 0, bufObj->Size,
-                               format, type, data,
-                               "glClearBufferData", false);
+   clear_buffer_sub_data_error(ctx, bufObj, internalformat, 0, bufObj->Size,
+                               format, type, data, "glClearBufferData", false);
 }
 
+
+void GLAPIENTRY
+_mesa_ClearNamedBufferData_no_error(GLuint buffer, GLenum internalformat,
+                                    GLenum format, GLenum type,
+                                    const GLvoid *data)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   clear_buffer_sub_data_no_error(ctx, bufObj, internalformat, 0, bufObj->Size,
+                                  format, type, data, "glClearNamedBufferData",
+                                  false);
+}
+
+
 void GLAPIENTRY
 _mesa_ClearNamedBufferData(GLuint buffer, GLenum internalformat,
                            GLenum format, GLenum type, const GLvoid *data)
@@ -1784,9 +2542,40 @@ _mesa_ClearNamedBufferData(GLuint buffer, GLenum internalformat,
    if (!bufObj)
       return;
 
-   _mesa_clear_buffer_sub_data(ctx, bufObj, internalformat, 0, bufObj->Size,
-                               format, type, data,
-                               "glClearNamedBufferData", false);
+   clear_buffer_sub_data_error(ctx, bufObj, internalformat, 0, bufObj->Size,
+                               format, type, data, "glClearNamedBufferData",
+                               false);
+}
+
+
+void GLAPIENTRY
+_mesa_ClearNamedBufferDataEXT(GLuint buffer, GLenum internalformat,
+                              GLenum format, GLenum type, const GLvoid *data)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
+                                     &bufObj, "glClearNamedBufferDataEXT"))
+      return;
+
+   clear_buffer_sub_data_error(ctx, bufObj, internalformat, 0, bufObj->Size,
+                               format, type, data, "glClearNamedBufferDataEXT",
+                               false);
+}
+
+
+void GLAPIENTRY
+_mesa_ClearBufferSubData_no_error(GLenum target, GLenum internalformat,
+                                  GLintptr offset, GLsizeiptr size,
+                                  GLenum format, GLenum type,
+                                  const GLvoid *data)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   struct gl_buffer_object **bufObj = get_buffer_target(ctx, target);
+   clear_buffer_sub_data_no_error(ctx, *bufObj, internalformat, offset, size,
+                                  format, type, data, "glClearBufferSubData",
+                                  true);
 }
 
 
@@ -1803,11 +2592,27 @@ _mesa_ClearBufferSubData(GLenum target, GLenum internalformat,
    if (!bufObj)
       return;
 
-   _mesa_clear_buffer_sub_data(ctx, bufObj, internalformat, offset, size,
-                               format, type, data,
-                               "glClearBufferSubData", true);
+   clear_buffer_sub_data_error(ctx, bufObj, internalformat, offset, size,
+                               format, type, data, "glClearBufferSubData",
+                               true);
 }
 
+
+void GLAPIENTRY
+_mesa_ClearNamedBufferSubData_no_error(GLuint buffer, GLenum internalformat,
+                                       GLintptr offset, GLsizeiptr size,
+                                       GLenum format, GLenum type,
+                                       const GLvoid *data)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   clear_buffer_sub_data_no_error(ctx, bufObj, internalformat, offset, size,
+                                  format, type, data,
+                                  "glClearNamedBufferSubData", true);
+}
+
+
 void GLAPIENTRY
 _mesa_ClearNamedBufferSubData(GLuint buffer, GLenum internalformat,
                               GLintptr offset, GLsizeiptr size,
@@ -1822,136 +2627,50 @@ _mesa_ClearNamedBufferSubData(GLuint buffer, GLenum internalformat,
    if (!bufObj)
       return;
 
-   _mesa_clear_buffer_sub_data(ctx, bufObj, internalformat, offset, size,
-                               format, type, data,
-                               "glClearNamedBufferSubData", true);
+   clear_buffer_sub_data_error(ctx, bufObj, internalformat, offset, size,
+                               format, type, data, "glClearNamedBufferSubData",
+                               true);
 }
 
-
-void * GLAPIENTRY
-_mesa_MapBuffer(GLenum target, GLenum access)
+void GLAPIENTRY
+_mesa_ClearNamedBufferSubDataEXT(GLuint buffer, GLenum internalformat,
+                                 GLintptr offset, GLsizeiptr size,
+                                 GLenum format, GLenum type,
+                                 const GLvoid *data)
 {
    GET_CURRENT_CONTEXT(ctx);
-   struct gl_buffer_object * bufObj;
-   GLbitfield accessFlags;
-   void *map;
-   bool valid_access;
-
-   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, NULL);
-
-   switch (access) {
-   case GL_READ_ONLY_ARB:
-      accessFlags = GL_MAP_READ_BIT;
-      valid_access = _mesa_is_desktop_gl(ctx);
-      break;
-   case GL_WRITE_ONLY_ARB:
-      accessFlags = GL_MAP_WRITE_BIT;
-      valid_access = true;
-      break;
-   case GL_READ_WRITE_ARB:
-      accessFlags = GL_MAP_READ_BIT | GL_MAP_WRITE_BIT;
-      valid_access = _mesa_is_desktop_gl(ctx);
-      break;
-   default:
-      valid_access = false;
-      break;
-   }
-
-   if (!valid_access) {
-      _mesa_error(ctx, GL_INVALID_ENUM, "glMapBufferARB(access)");
-      return NULL;
-   }
-
-   bufObj = get_buffer(ctx, "glMapBufferARB", target, GL_INVALID_OPERATION);
-   if (!bufObj)
-      return NULL;
-
-   if (accessFlags & GL_MAP_READ_BIT &&
-       !(bufObj->StorageFlags & GL_MAP_READ_BIT)) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBuffer(invalid read flag)");
-      return NULL;
-   }
-
-   if (accessFlags & GL_MAP_WRITE_BIT &&
-       !(bufObj->StorageFlags & GL_MAP_WRITE_BIT)) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBuffer(invalid write flag)");
-      return NULL;
-   }
-
-   if (_mesa_bufferobj_mapped(bufObj, MAP_USER)) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "glMapBufferARB(already mapped)");
-      return NULL;
-   }
-
-   if (!bufObj->Size) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY,
-                  "glMapBuffer(buffer size = 0)");
-      return NULL;
-   }
-
-   assert(ctx->Driver.MapBufferRange);
-   map = ctx->Driver.MapBufferRange(ctx, 0, bufObj->Size, accessFlags, bufObj,
-                                    MAP_USER);
-   if (!map) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glMapBufferARB(map failed)");
-      return NULL;
-   }
-   else {
-      /* The driver callback should have set these fields.
-       * This is important because other modules (like VBO) might call
-       * the driver function directly.
-       */
-      assert(bufObj->Mappings[MAP_USER].Pointer == map);
-      assert(bufObj->Mappings[MAP_USER].Length == bufObj->Size);
-      assert(bufObj->Mappings[MAP_USER].Offset == 0);
-      bufObj->Mappings[MAP_USER].AccessFlags = accessFlags;
-   }
-
-   if (access == GL_WRITE_ONLY_ARB || access == GL_READ_WRITE_ARB)
-      bufObj->Written = GL_TRUE;
+   struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
+                                     &bufObj, "glClearNamedBufferSubDataEXT"))
+      return;
 
-#ifdef VBO_DEBUG
-   printf("glMapBufferARB(%u, sz %ld, access 0x%x)\n",
-         bufObj->Name, bufObj->Size, access);
-   if (access == GL_WRITE_ONLY_ARB) {
-      GLuint i;
-      GLubyte *b = (GLubyte *) bufObj->Pointer;
-      for (i = 0; i < bufObj->Size; i++)
-         b[i] = i & 0xff;
-   }
-#endif
+   clear_buffer_sub_data_error(ctx, bufObj, internalformat, offset, size,
+                               format, type, data, "glClearNamedBufferSubDataEXT",
+                               true);
+}
 
-#ifdef BOUNDS_CHECK
-   {
-      GLubyte *buf = (GLubyte *) bufObj->Pointer;
-      GLuint i;
-      /* buffer is 100 bytes larger than requested, fill with magic value */
-      for (i = 0; i < 100; i++) {
-         buf[bufObj->Size - i - 1] = 123;
-      }
-   }
-#endif
+static GLboolean
+unmap_buffer(struct gl_context *ctx, struct gl_buffer_object *bufObj)
+{
+   GLboolean status = ctx->Driver.UnmapBuffer(ctx, bufObj, MAP_USER);
+   bufObj->Mappings[MAP_USER].AccessFlags = 0;
+   assert(bufObj->Mappings[MAP_USER].Pointer == NULL);
+   assert(bufObj->Mappings[MAP_USER].Offset == 0);
+   assert(bufObj->Mappings[MAP_USER].Length == 0);
 
-   return bufObj->Mappings[MAP_USER].Pointer;
+   return status;
 }
 
-
-GLboolean GLAPIENTRY
-_mesa_UnmapBuffer(GLenum target)
+static GLboolean
+validate_and_unmap_buffer(struct gl_context *ctx,
+                          struct gl_buffer_object *bufObj,
+                          const char *func)
 {
-   GET_CURRENT_CONTEXT(ctx);
-   struct gl_buffer_object *bufObj;
-   GLboolean status = GL_TRUE;
    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 
-   bufObj = get_buffer(ctx, "glUnmapBufferARB", target, GL_INVALID_OPERATION);
-   if (!bufObj)
-      return GL_FALSE;
-
    if (!_mesa_bufferobj_mapped(bufObj, MAP_USER)) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "glUnmapBufferARB");
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "%s(buffer is not mapped)", func);
       return GL_FALSE;
    }
 
@@ -1991,138 +2710,217 @@ _mesa_UnmapBuffer(GLenum target)
    }
 #endif
 
-   status = ctx->Driver.UnmapBuffer(ctx, bufObj, MAP_USER);
-   bufObj->Mappings[MAP_USER].AccessFlags = 0;
-   assert(bufObj->Mappings[MAP_USER].Pointer == NULL);
-   assert(bufObj->Mappings[MAP_USER].Offset == 0);
-   assert(bufObj->Mappings[MAP_USER].Length == 0);
+   return unmap_buffer(ctx, bufObj);
+}
 
-   return status;
+GLboolean GLAPIENTRY
+_mesa_UnmapBuffer_no_error(GLenum target)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object **bufObjPtr = get_buffer_target(ctx, target);
+   struct gl_buffer_object *bufObj = *bufObjPtr;
+
+   return unmap_buffer(ctx, bufObj);
 }
 
+GLboolean GLAPIENTRY
+_mesa_UnmapBuffer(GLenum target)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
+
+   bufObj = get_buffer(ctx, "glUnmapBuffer", target, GL_INVALID_OPERATION);
+   if (!bufObj)
+      return GL_FALSE;
 
-void GLAPIENTRY
-_mesa_GetBufferParameteriv(GLenum target, GLenum pname, GLint *params)
+   return validate_and_unmap_buffer(ctx, bufObj, "glUnmapBuffer");
+}
+
+GLboolean GLAPIENTRY
+_mesa_UnmapNamedBufferEXT_no_error(GLuint buffer)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+
+   return unmap_buffer(ctx, bufObj);
+}
+
+GLboolean GLAPIENTRY
+_mesa_UnmapNamedBufferEXT(GLuint buffer)
 {
    GET_CURRENT_CONTEXT(ctx);
    struct gl_buffer_object *bufObj;
 
-   bufObj = get_buffer(ctx, "glGetBufferParameterivARB", target,
-                       GL_INVALID_OPERATION);
+   if (!buffer) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glUnmapNamedBufferEXT(buffer=0)");
+      return GL_FALSE;
+   }
+
+   bufObj = _mesa_lookup_bufferobj_err(ctx, buffer, "glUnmapNamedBuffer");
    if (!bufObj)
-      return;
+      return GL_FALSE;
+
+   return validate_and_unmap_buffer(ctx, bufObj, "glUnmapNamedBuffer");
+}
+
 
+static bool
+get_buffer_parameter(struct gl_context *ctx,
+                     struct gl_buffer_object *bufObj, GLenum pname,
+                     GLint64 *params, const char *func)
+{
    switch (pname) {
    case GL_BUFFER_SIZE_ARB:
-      *params = (GLint) bufObj->Size;
-      return;
+      *params = bufObj->Size;
+      break;
    case GL_BUFFER_USAGE_ARB:
       *params = bufObj->Usage;
-      return;
+      break;
    case GL_BUFFER_ACCESS_ARB:
       *params = simplified_access_mode(ctx,
                             bufObj->Mappings[MAP_USER].AccessFlags);
-      return;
+      break;
    case GL_BUFFER_MAPPED_ARB:
       *params = _mesa_bufferobj_mapped(bufObj, MAP_USER);
-      return;
+      break;
    case GL_BUFFER_ACCESS_FLAGS:
       if (!ctx->Extensions.ARB_map_buffer_range)
          goto invalid_pname;
       *params = bufObj->Mappings[MAP_USER].AccessFlags;
-      return;
+      break;
    case GL_BUFFER_MAP_OFFSET:
       if (!ctx->Extensions.ARB_map_buffer_range)
          goto invalid_pname;
-      *params = (GLint) bufObj->Mappings[MAP_USER].Offset;
-      return;
+      *params = bufObj->Mappings[MAP_USER].Offset;
+      break;
    case GL_BUFFER_MAP_LENGTH:
       if (!ctx->Extensions.ARB_map_buffer_range)
          goto invalid_pname;
-      *params = (GLint) bufObj->Mappings[MAP_USER].Length;
-      return;
+      *params = bufObj->Mappings[MAP_USER].Length;
+      break;
    case GL_BUFFER_IMMUTABLE_STORAGE:
       if (!ctx->Extensions.ARB_buffer_storage)
          goto invalid_pname;
       *params = bufObj->Immutable;
-      return;
+      break;
    case GL_BUFFER_STORAGE_FLAGS:
       if (!ctx->Extensions.ARB_buffer_storage)
          goto invalid_pname;
       *params = bufObj->StorageFlags;
-      return;
+      break;
    default:
-      ; /* fall-through */
+      goto invalid_pname;
    }
 
+   return true;
+
 invalid_pname:
-   _mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferParameterivARB(pname=%s)",
-               _mesa_lookup_enum_by_nr(pname));
+   _mesa_error(ctx, GL_INVALID_ENUM, "%s(invalid pname: %s)", func,
+               _mesa_enum_to_string(pname));
+   return false;
 }
 
+void GLAPIENTRY
+_mesa_GetBufferParameteriv(GLenum target, GLenum pname, GLint *params)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
+   GLint64 parameter;
+
+   bufObj = get_buffer(ctx, "glGetBufferParameteriv", target,
+                       GL_INVALID_OPERATION);
+   if (!bufObj)
+      return;
+
+   if (!get_buffer_parameter(ctx, bufObj, pname, &parameter,
+                             "glGetBufferParameteriv"))
+      return; /* Error already recorded. */
+
+   *params = (GLint) parameter;
+}
 
-/**
- * New in GL 3.2
- * This is pretty much a duplicate of GetBufferParameteriv() but the
- * GL_BUFFER_SIZE_ARB attribute will be 64-bits on a 64-bit system.
- */
 void GLAPIENTRY
 _mesa_GetBufferParameteri64v(GLenum target, GLenum pname, GLint64 *params)
 {
    GET_CURRENT_CONTEXT(ctx);
    struct gl_buffer_object *bufObj;
+   GLint64 parameter;
 
    bufObj = get_buffer(ctx, "glGetBufferParameteri64v", target,
                        GL_INVALID_OPERATION);
    if (!bufObj)
       return;
 
-   switch (pname) {
-   case GL_BUFFER_SIZE_ARB:
-      *params = bufObj->Size;
-      return;
-   case GL_BUFFER_USAGE_ARB:
-      *params = bufObj->Usage;
-      return;
-   case GL_BUFFER_ACCESS_ARB:
-      *params = simplified_access_mode(ctx,
-                             bufObj->Mappings[MAP_USER].AccessFlags);
-      return;
-   case GL_BUFFER_ACCESS_FLAGS:
-      if (!ctx->Extensions.ARB_map_buffer_range)
-         goto invalid_pname;
-      *params = bufObj->Mappings[MAP_USER].AccessFlags;
-      return;
-   case GL_BUFFER_MAPPED_ARB:
-      *params = _mesa_bufferobj_mapped(bufObj, MAP_USER);
-      return;
-   case GL_BUFFER_MAP_OFFSET:
-      if (!ctx->Extensions.ARB_map_buffer_range)
-         goto invalid_pname;
-      *params = bufObj->Mappings[MAP_USER].Offset;
+   if (!get_buffer_parameter(ctx, bufObj, pname, &parameter,
+                             "glGetBufferParameteri64v"))
+      return; /* Error already recorded. */
+
+   *params = parameter;
+}
+
+void GLAPIENTRY
+_mesa_GetNamedBufferParameteriv(GLuint buffer, GLenum pname, GLint *params)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
+   GLint64 parameter;
+
+   bufObj = _mesa_lookup_bufferobj_err(ctx, buffer,
+                                       "glGetNamedBufferParameteriv");
+   if (!bufObj)
       return;
-   case GL_BUFFER_MAP_LENGTH:
-      if (!ctx->Extensions.ARB_map_buffer_range)
-         goto invalid_pname;
-      *params = bufObj->Mappings[MAP_USER].Length;
+
+   if (!get_buffer_parameter(ctx, bufObj, pname, &parameter,
+                             "glGetNamedBufferParameteriv"))
+      return; /* Error already recorded. */
+
+   *params = (GLint) parameter;
+}
+
+void GLAPIENTRY
+_mesa_GetNamedBufferParameterivEXT(GLuint buffer, GLenum pname, GLint *params)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
+   GLint64 parameter;
+
+   if (!buffer) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glGetNamedBufferParameterivEXT: buffer=0");
       return;
-   case GL_BUFFER_IMMUTABLE_STORAGE:
-      if (!ctx->Extensions.ARB_buffer_storage)
-         goto invalid_pname;
-      *params = bufObj->Immutable;
+   }
+
+   bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
+                                     &bufObj, "glGetNamedBufferParameterivEXT"))
       return;
-   case GL_BUFFER_STORAGE_FLAGS:
-      if (!ctx->Extensions.ARB_buffer_storage)
-         goto invalid_pname;
-      *params = bufObj->StorageFlags;
+
+   if (!get_buffer_parameter(ctx, bufObj, pname, &parameter,
+                             "glGetNamedBufferParameterivEXT"))
+      return; /* Error already recorded. */
+
+   *params = (GLint) parameter;
+}
+
+void GLAPIENTRY
+_mesa_GetNamedBufferParameteri64v(GLuint buffer, GLenum pname,
+                                  GLint64 *params)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
+   GLint64 parameter;
+
+   bufObj = _mesa_lookup_bufferobj_err(ctx, buffer,
+                                       "glGetNamedBufferParameteri64v");
+   if (!bufObj)
       return;
-   default:
-      ; /* fall-through */
-   }
 
-invalid_pname:
-   _mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferParameteri64v(pname=%s)",
-               _mesa_lookup_enum_by_nr(pname));
+   if (!get_buffer_parameter(ctx, bufObj, pname, &parameter,
+                             "glGetNamedBufferParameteri64v"))
+      return; /* Error already recorded. */
+
+   *params = parameter;
 }
 
 
@@ -2130,14 +2928,15 @@ void GLAPIENTRY
 _mesa_GetBufferPointerv(GLenum target, GLenum pname, GLvoid **params)
 {
    GET_CURRENT_CONTEXT(ctx);
-   struct gl_buffer_object * bufObj;
+   struct gl_buffer_object *bufObj;
 
-   if (pname != GL_BUFFER_MAP_POINTER_ARB) {
-      _mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferPointervARB(pname)");
+   if (pname != GL_BUFFER_MAP_POINTER) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferPointerv(pname != "
+                  "GL_BUFFER_MAP_POINTER)");
       return;
    }
 
-   bufObj = get_buffer(ctx, "glGetBufferPointervARB", target,
+   bufObj = get_buffer(ctx, "glGetBufferPointerv", target,
                        GL_INVALID_OPERATION);
    if (!bufObj)
       return;
@@ -2145,13 +2944,55 @@ _mesa_GetBufferPointerv(GLenum target, GLenum pname, GLvoid **params)
    *params = bufObj->Mappings[MAP_USER].Pointer;
 }
 
+void GLAPIENTRY
+_mesa_GetNamedBufferPointerv(GLuint buffer, GLenum pname, GLvoid **params)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
 
-void
-_mesa_copy_buffer_sub_data(struct gl_context *ctx,
-                           struct gl_buffer_object *src,
-                           struct gl_buffer_object *dst,
-                           GLintptr readOffset, GLintptr writeOffset,
-                           GLsizeiptr size, const char *func)
+   if (pname != GL_BUFFER_MAP_POINTER) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetNamedBufferPointerv(pname != "
+                  "GL_BUFFER_MAP_POINTER)");
+      return;
+   }
+
+   bufObj = _mesa_lookup_bufferobj_err(ctx, buffer,
+                                       "glGetNamedBufferPointerv");
+   if (!bufObj)
+      return;
+
+   *params = bufObj->Mappings[MAP_USER].Pointer;
+}
+
+void GLAPIENTRY
+_mesa_GetNamedBufferPointervEXT(GLuint buffer, GLenum pname, GLvoid **params)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
+
+   if (!buffer) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glGetNamedBufferPointervEXT(buffer=0)");
+      return;
+   }
+   if (pname != GL_BUFFER_MAP_POINTER) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetNamedBufferPointervEXT(pname != "
+                  "GL_BUFFER_MAP_POINTER)");
+      return;
+   }
+
+   bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
+                                     &bufObj, "glGetNamedBufferPointervEXT"))
+      return;
+
+   *params = bufObj->Mappings[MAP_USER].Pointer;
+}
+
+static void
+copy_buffer_sub_data(struct gl_context *ctx, struct gl_buffer_object *src,
+                     struct gl_buffer_object *dst, GLintptr readOffset,
+                     GLintptr writeOffset, GLsizeiptr size, const char *func)
 {
    if (_mesa_check_disallowed_mapping(src)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
@@ -2212,9 +3053,29 @@ _mesa_copy_buffer_sub_data(struct gl_context *ctx,
       }
    }
 
+   dst->MinMaxCacheDirty = true;
+
    ctx->Driver.CopyBufferSubData(ctx, src, dst, readOffset, writeOffset, size);
 }
 
+void GLAPIENTRY
+_mesa_CopyBufferSubData_no_error(GLenum readTarget, GLenum writeTarget,
+                                 GLintptr readOffset, GLintptr writeOffset,
+                                 GLsizeiptr size)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   struct gl_buffer_object **src_ptr = get_buffer_target(ctx, readTarget);
+   struct gl_buffer_object *src = *src_ptr;
+
+   struct gl_buffer_object **dst_ptr = get_buffer_target(ctx, writeTarget);
+   struct gl_buffer_object *dst = *dst_ptr;
+
+   dst->MinMaxCacheDirty = true;
+   ctx->Driver.CopyBufferSubData(ctx, src, dst, readOffset, writeOffset,
+                                 size);
+}
+
 void GLAPIENTRY
 _mesa_CopyBufferSubData(GLenum readTarget, GLenum writeTarget,
                         GLintptr readOffset, GLintptr writeOffset,
@@ -2233,8 +3094,47 @@ _mesa_CopyBufferSubData(GLenum readTarget, GLenum writeTarget,
    if (!dst)
       return;
 
-   _mesa_copy_buffer_sub_data(ctx, src, dst, readOffset, writeOffset, size,
-                              "glCopyBufferSubData");
+   copy_buffer_sub_data(ctx, src, dst, readOffset, writeOffset, size,
+                        "glCopyBufferSubData");
+}
+
+void GLAPIENTRY
+_mesa_NamedCopyBufferSubDataEXT(GLuint readBuffer, GLuint writeBuffer,
+                                GLintptr readOffset, GLintptr writeOffset,
+                                GLsizeiptr size)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *src, *dst;
+
+   src = _mesa_lookup_bufferobj(ctx, readBuffer);
+   if (!_mesa_handle_bind_buffer_gen(ctx, readBuffer,
+                                     &src,
+                                     "glNamedCopyBufferSubDataEXT"))
+      return;
+
+   dst = _mesa_lookup_bufferobj(ctx, writeBuffer);
+   if (!_mesa_handle_bind_buffer_gen(ctx, writeBuffer,
+                                     &dst,
+                                     "glNamedCopyBufferSubDataEXT"))
+      return;
+
+   copy_buffer_sub_data(ctx, src, dst, readOffset, writeOffset, size,
+                        "glNamedCopyBufferSubDataEXT");
+}
+
+void GLAPIENTRY
+_mesa_CopyNamedBufferSubData_no_error(GLuint readBuffer, GLuint writeBuffer,
+                                      GLintptr readOffset,
+                                      GLintptr writeOffset, GLsizeiptr size)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   struct gl_buffer_object *src = _mesa_lookup_bufferobj(ctx, readBuffer);
+   struct gl_buffer_object *dst = _mesa_lookup_bufferobj(ctx, writeBuffer);
+
+   dst->MinMaxCacheDirty = true;
+   ctx->Driver.CopyBufferSubData(ctx, src, dst, readOffset, writeOffset,
+                                 size);
 }
 
 void GLAPIENTRY
@@ -2255,41 +3155,30 @@ _mesa_CopyNamedBufferSubData(GLuint readBuffer, GLuint writeBuffer,
    if (!dst)
       return;
 
-   _mesa_copy_buffer_sub_data(ctx, src, dst, readOffset, writeOffset, size,
-                              "glCopyNamedBufferSubData");
+   copy_buffer_sub_data(ctx, src, dst, readOffset, writeOffset, size,
+                        "glCopyNamedBufferSubData");
 }
 
-
-/**
- * See GL_ARB_map_buffer_range spec
- */
-void * GLAPIENTRY
-_mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
-                     GLbitfield access)
+static bool
+validate_map_buffer_range(struct gl_context *ctx,
+                          struct gl_buffer_object *bufObj, GLintptr offset,
+                          GLsizeiptr length, GLbitfield access,
+                          const char *func)
 {
-   GET_CURRENT_CONTEXT(ctx);
-   struct gl_buffer_object *bufObj;
-   void *map;
    GLbitfield allowed_access;
 
-   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, NULL);
-
-   if (!ctx->Extensions.ARB_map_buffer_range) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(extension not supported)");
-      return NULL;
-   }
+   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, false);
 
    if (offset < 0) {
       _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glMapBufferRange(offset = %ld)", (long)offset);
-      return NULL;
+                  "%s(offset %ld < 0)", func, (long) offset);
+      return false;
    }
 
    if (length < 0) {
       _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glMapBufferRange(length = %ld)", (long)length);
-      return NULL;
+                  "%s(length %ld < 0)", func, (long) length);
+      return false;
    }
 
    /* Page 38 of the PDF of the OpenGL ES 3.0 spec says:
@@ -2298,11 +3187,14 @@ _mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
     *     conditions:
     *
     *     * <length> is zero."
+    *
+    * Additionally, page 94 of the PDF of the OpenGL 4.5 core spec
+    * (30.10.2014) also says this, so it's no longer allowed for desktop GL,
+    * either.
     */
-   if (_mesa_is_gles(ctx) && length == 0) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(length = 0)");
-      return NULL;
+   if (length == 0) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "%s(length = 0)", func);
+      return false;
    }
 
    allowed_access = GL_MAP_READ_BIT |
@@ -2318,15 +3210,16 @@ _mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
    }
 
    if (access & ~allowed_access) {
-      /* generate an error if any other than allowed bit is set */
-      _mesa_error(ctx, GL_INVALID_VALUE, "glMapBufferRange(access)");
-      return NULL;
+      /* generate an error if any bits other than those allowed are set */
+      _mesa_error(ctx, GL_INVALID_VALUE,
+                  "%s(access has undefined bits set)", func);
+      return false;
    }
 
    if ((access & (GL_MAP_READ_BIT | GL_MAP_WRITE_BIT)) == 0) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(access indicates neither read or write)");
-      return NULL;
+                  "%s(access indicates neither read or write)", func);
+      return false;
    }
 
    if ((access & GL_MAP_READ_BIT) &&
@@ -2334,82 +3227,90 @@ _mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
                   GL_MAP_INVALIDATE_BUFFER_BIT |
                   GL_MAP_UNSYNCHRONIZED_BIT))) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(invalid access flags)");
-      return NULL;
+                  "%s(read access with disallowed bits)", func);
+      return false;
    }
 
    if ((access & GL_MAP_FLUSH_EXPLICIT_BIT) &&
        ((access & GL_MAP_WRITE_BIT) == 0)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(invalid access flags)");
-      return NULL;
+                  "%s(access has flush explicit without write)", func);
+      return false;
    }
 
-   bufObj = get_buffer(ctx, "glMapBufferRange", target, GL_INVALID_OPERATION);
-   if (!bufObj)
-      return NULL;
-
    if (access & GL_MAP_READ_BIT &&
        !(bufObj->StorageFlags & GL_MAP_READ_BIT)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(invalid read flag)");
-      return NULL;
+                  "%s(buffer does not allow read access)", func);
+      return false;
    }
 
    if (access & GL_MAP_WRITE_BIT &&
        !(bufObj->StorageFlags & GL_MAP_WRITE_BIT)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(invalid write flag)");
-      return NULL;
+                  "%s(buffer does not allow write access)", func);
+      return false;
    }
 
    if (access & GL_MAP_COHERENT_BIT &&
        !(bufObj->StorageFlags & GL_MAP_COHERENT_BIT)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(invalid coherent flag)");
-      return NULL;
+                  "%s(buffer does not allow coherent access)", func);
+      return false;
    }
 
    if (access & GL_MAP_PERSISTENT_BIT &&
        !(bufObj->StorageFlags & GL_MAP_PERSISTENT_BIT)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(invalid persistent flag)");
-      return NULL;
+                  "%s(buffer does not allow persistent access)", func);
+      return false;
    }
 
    if (offset + length > bufObj->Size) {
       _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glMapBufferRange(offset + length > size)");
-      return NULL;
+                  "%s(offset %lu + length %lu > buffer_size %lu)", func,
+                  (unsigned long) offset, (unsigned long) length,
+                  (unsigned long) bufObj->Size);
+      return false;
    }
 
    if (_mesa_bufferobj_mapped(bufObj, MAP_USER)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(buffer already mapped)");
-      return NULL;
+                  "%s(buffer already mapped)", func);
+      return false;
    }
 
-   if (!bufObj->Size) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY,
-                  "glMapBufferRange(buffer size = 0)");
-      return NULL;
+   if (access & GL_MAP_WRITE_BIT) {
+      bufObj->NumMapBufferWriteCalls++;
+      if ((bufObj->Usage == GL_STATIC_DRAW ||
+           bufObj->Usage == GL_STATIC_COPY) &&
+          bufObj->NumMapBufferWriteCalls >= BUFFER_WARNING_CALL_COUNT) {
+         BUFFER_USAGE_WARNING(ctx,
+                              "using %s(buffer %u, offset %u, length %u) to "
+                              "update a %s buffer",
+                              func, bufObj->Name, offset, length,
+                              _mesa_enum_to_string(bufObj->Usage));
+      }
    }
 
-   /* Mapping zero bytes should return a non-null pointer. */
-   if (!length) {
-      static long dummy = 0;
-      bufObj->Mappings[MAP_USER].Pointer = &dummy;
-      bufObj->Mappings[MAP_USER].Length = length;
-      bufObj->Mappings[MAP_USER].Offset = offset;
-      bufObj->Mappings[MAP_USER].AccessFlags = access;
-      return bufObj->Mappings[MAP_USER].Pointer;
+   return true;
+}
+
+static void *
+map_buffer_range(struct gl_context *ctx, struct gl_buffer_object *bufObj,
+                 GLintptr offset, GLsizeiptr length, GLbitfield access,
+                 const char *func)
+{
+   if (!bufObj->Size) {
+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s(buffer size = 0)", func);
+      return NULL;
    }
 
    assert(ctx->Driver.MapBufferRange);
-   map = ctx->Driver.MapBufferRange(ctx, offset, length, access, bufObj,
-                                    MAP_USER);
+   void *map = ctx->Driver.MapBufferRange(ctx, offset, length, access, bufObj,
+                                          MAP_USER);
    if (!map) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glMapBufferARB(map failed)");
+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s(map failed)", func);
    }
    else {
       /* The driver callback should have set all these fields.
@@ -2422,502 +3323,415 @@ _mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
       assert(bufObj->Mappings[MAP_USER].AccessFlags == access);
    }
 
-   return map;
-}
-
-
-/**
- * See GL_ARB_map_buffer_range spec
- */
-void GLAPIENTRY
-_mesa_FlushMappedBufferRange(GLenum target, GLintptr offset, GLsizeiptr length)
-{
-   GET_CURRENT_CONTEXT(ctx);
-   struct gl_buffer_object *bufObj;
-
-   if (!ctx->Extensions.ARB_map_buffer_range) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glFlushMappedBufferRange(extension not supported)");
-      return;
-   }
-
-   if (offset < 0) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glFlushMappedBufferRange(offset = %ld)", (long)offset);
-      return;
-   }
-
-   if (length < 0) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glFlushMappedBufferRange(length = %ld)", (long)length);
-      return;
-   }
-
-   bufObj = get_buffer(ctx, "glFlushMappedBufferRange", target,
-                       GL_INVALID_OPERATION);
-   if (!bufObj)
-      return;
-
-   if (!_mesa_bufferobj_mapped(bufObj, MAP_USER)) {
-      /* buffer is not mapped */
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glFlushMappedBufferRange(buffer is not mapped)");
-      return;
+   if (access & GL_MAP_WRITE_BIT) {
+      bufObj->Written = GL_TRUE;
+      bufObj->MinMaxCacheDirty = true;
    }
 
-   if ((bufObj->Mappings[MAP_USER].AccessFlags &
-        GL_MAP_FLUSH_EXPLICIT_BIT) == 0) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glFlushMappedBufferRange(GL_MAP_FLUSH_EXPLICIT_BIT not set)");
-      return;
+#ifdef VBO_DEBUG
+   if (strstr(func, "Range") == NULL) { /* If not MapRange */
+      printf("glMapBuffer(%u, sz %ld, access 0x%x)\n",
+            bufObj->Name, bufObj->Size, access);
+      /* Access must be write only */
+      if ((access & GL_MAP_WRITE_BIT) && (!(access & ~GL_MAP_WRITE_BIT))) {
+         GLuint i;
+         GLubyte *b = (GLubyte *) bufObj->Pointer;
+         for (i = 0; i < bufObj->Size; i++)
+            b[i] = i & 0xff;
+      }
    }
+#endif
 
-   if (offset + length > bufObj->Mappings[MAP_USER].Length) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                 "glFlushMappedBufferRange(offset %ld + length %ld > mapped length %ld)",
-                 (long)offset, (long)length,
-                  (long)bufObj->Mappings[MAP_USER].Length);
-      return;
+#ifdef BOUNDS_CHECK
+   if (strstr(func, "Range") == NULL) { /* If not MapRange */
+      GLubyte *buf = (GLubyte *) bufObj->Pointer;
+      GLuint i;
+      /* buffer is 100 bytes larger than requested, fill with magic value */
+      for (i = 0; i < 100; i++) {
+         buf[bufObj->Size - i - 1] = 123;
+      }
    }
+#endif
 
-   assert(bufObj->Mappings[MAP_USER].AccessFlags & GL_MAP_WRITE_BIT);
-
-   if (ctx->Driver.FlushMappedBufferRange)
-      ctx->Driver.FlushMappedBufferRange(ctx, offset, length, bufObj,
-                                         MAP_USER);
+   return map;
 }
 
+void * GLAPIENTRY
+_mesa_MapBufferRange_no_error(GLenum target, GLintptr offset,
+                              GLsizeiptr length, GLbitfield access)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   struct gl_buffer_object **bufObjPtr = get_buffer_target(ctx, target);
+   struct gl_buffer_object *bufObj = *bufObjPtr;
 
-static GLenum
-buffer_object_purgeable(struct gl_context *ctx, GLuint name, GLenum option)
+   return map_buffer_range(ctx, bufObj, offset, length, access,
+                           "glMapBufferRange");
+}
+
+void * GLAPIENTRY
+_mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
+                     GLbitfield access)
 {
+   GET_CURRENT_CONTEXT(ctx);
    struct gl_buffer_object *bufObj;
-   GLenum retval;
-
-   bufObj = _mesa_lookup_bufferobj(ctx, name);
-   if (!bufObj) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glObjectPurgeable(name = 0x%x)", name);
-      return 0;
-   }
-   if (!_mesa_is_bufferobj(bufObj)) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "glObjectPurgeable(buffer 0)" );
-      return 0;
-   }
 
-   if (bufObj->Purgeable) {
+   if (!ctx->Extensions.ARB_map_buffer_range) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glObjectPurgeable(name = 0x%x) is already purgeable", name);
-      return GL_VOLATILE_APPLE;
+                  "glMapBufferRange(ARB_map_buffer_range not supported)");
+      return NULL;
    }
 
-   bufObj->Purgeable = GL_TRUE;
+   bufObj = get_buffer(ctx, "glMapBufferRange", target, GL_INVALID_OPERATION);
+   if (!bufObj)
+      return NULL;
 
-   retval = GL_VOLATILE_APPLE;
-   if (ctx->Driver.BufferObjectPurgeable)
-      retval = ctx->Driver.BufferObjectPurgeable(ctx, bufObj, option);
+   if (!validate_map_buffer_range(ctx, bufObj, offset, length, access,
+                                  "glMapBufferRange"))
+      return NULL;
 
-   return retval;
+   return map_buffer_range(ctx, bufObj, offset, length, access,
+                           "glMapBufferRange");
 }
 
-
-static GLenum
-renderbuffer_purgeable(struct gl_context *ctx, GLuint name, GLenum option)
+void * GLAPIENTRY
+_mesa_MapNamedBufferRange_no_error(GLuint buffer, GLintptr offset,
+                                   GLsizeiptr length, GLbitfield access)
 {
-   struct gl_renderbuffer *bufObj;
-   GLenum retval;
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, buffer);
 
-   bufObj = _mesa_lookup_renderbuffer(ctx, name);
-   if (!bufObj) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glObjectUnpurgeable(name = 0x%x)", name);
-      return 0;
-   }
+   return map_buffer_range(ctx, bufObj, offset, length, access,
+                           "glMapNamedBufferRange");
+}
+
+static void *
+map_named_buffer_range(GLuint buffer, GLintptr offset, GLsizeiptr length,
+                       GLbitfield access, bool dsa_ext, const char *func)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj = NULL;
 
-   if (bufObj->Purgeable) {
+   if (!ctx->Extensions.ARB_map_buffer_range) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glObjectPurgeable(name = 0x%x) is already purgeable", name);
-      return GL_VOLATILE_APPLE;
+                  "%s(ARB_map_buffer_range not supported)", func);
+      return NULL;
    }
 
-   bufObj->Purgeable = GL_TRUE;
+   if (dsa_ext) {
+      bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+      if (!_mesa_handle_bind_buffer_gen(ctx, buffer, &bufObj, func))
+         return NULL;
+   } else {
+      bufObj = _mesa_lookup_bufferobj_err(ctx, buffer, func);
+      if (!bufObj)
+         return NULL;
+   }
 
-   retval = GL_VOLATILE_APPLE;
-   if (ctx->Driver.RenderObjectPurgeable)
-      retval = ctx->Driver.RenderObjectPurgeable(ctx, bufObj, option);
+   if (!validate_map_buffer_range(ctx, bufObj, offset, length, access, func))
+      return NULL;
 
-   return retval;
+   return map_buffer_range(ctx, bufObj, offset, length, access, func);
 }
 
-
-static GLenum
-texture_object_purgeable(struct gl_context *ctx, GLuint name, GLenum option)
+void * GLAPIENTRY
+_mesa_MapNamedBufferRangeEXT(GLuint buffer, GLintptr offset, GLsizeiptr length,
+                             GLbitfield access)
 {
-   struct gl_texture_object *bufObj;
-   GLenum retval;
-
-   bufObj = _mesa_lookup_texture(ctx, name);
-   if (!bufObj) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glObjectPurgeable(name = 0x%x)", name);
-      return 0;
-   }
-
-   if (bufObj->Purgeable) {
+   GET_CURRENT_CONTEXT(ctx);
+   if (!buffer) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glObjectPurgeable(name = 0x%x) is already purgeable", name);
-      return GL_VOLATILE_APPLE;
+                  "glMapNamedBufferRangeEXT(buffer=0)");
+      return NULL;
    }
-
-   bufObj->Purgeable = GL_TRUE;
-
-   retval = GL_VOLATILE_APPLE;
-   if (ctx->Driver.TextureObjectPurgeable)
-      retval = ctx->Driver.TextureObjectPurgeable(ctx, bufObj, option);
-
-   return retval;
+   return map_named_buffer_range(buffer, offset, length, access, true,
+                                 "glMapNamedBufferRangeEXT");
 }
 
+void * GLAPIENTRY
+_mesa_MapNamedBufferRange(GLuint buffer, GLintptr offset, GLsizeiptr length,
+                          GLbitfield access)
+{
+   return map_named_buffer_range(buffer, offset, length, access, false,
+                                 "glMapNamedBufferRange");
+}
 
-GLenum GLAPIENTRY
-_mesa_ObjectPurgeableAPPLE(GLenum objectType, GLuint name, GLenum option)
+/**
+ * Converts GLenum access from MapBuffer and MapNamedBuffer into
+ * flags for input to map_buffer_range.
+ *
+ * \return true if the type of requested access is permissible.
+ */
+static bool
+get_map_buffer_access_flags(struct gl_context *ctx, GLenum access,
+                            GLbitfield *flags)
 {
-   GLenum retval;
+   switch (access) {
+   case GL_READ_ONLY_ARB:
+      *flags = GL_MAP_READ_BIT;
+      return _mesa_is_desktop_gl(ctx);
+   case GL_WRITE_ONLY_ARB:
+      *flags = GL_MAP_WRITE_BIT;
+      return true;
+   case GL_READ_WRITE_ARB:
+      *flags = GL_MAP_READ_BIT | GL_MAP_WRITE_BIT;
+      return _mesa_is_desktop_gl(ctx);
+   default:
+      *flags = 0;
+      return false;
+   }
+}
 
+void * GLAPIENTRY
+_mesa_MapBuffer_no_error(GLenum target, GLenum access)
+{
    GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
-
-   if (name == 0) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glObjectPurgeable(name = 0x%x)", name);
-      return 0;
-   }
 
-   switch (option) {
-   case GL_VOLATILE_APPLE:
-   case GL_RELEASED_APPLE:
-      /* legal */
-      break;
-   default:
-      _mesa_error(ctx, GL_INVALID_ENUM,
-                  "glObjectPurgeable(name = 0x%x) invalid option: %d",
-                  name, option);
-      return 0;
-   }
+   GLbitfield accessFlags;
+   get_map_buffer_access_flags(ctx, access, &accessFlags);
 
-   switch (objectType) {
-   case GL_TEXTURE:
-      retval = texture_object_purgeable(ctx, name, option);
-      break;
-   case GL_RENDERBUFFER_EXT:
-      retval = renderbuffer_purgeable(ctx, name, option);
-      break;
-   case GL_BUFFER_OBJECT_APPLE:
-      retval = buffer_object_purgeable(ctx, name, option);
-      break;
-   default:
-      _mesa_error(ctx, GL_INVALID_ENUM,
-                  "glObjectPurgeable(name = 0x%x) invalid type: %d",
-                  name, objectType);
-      return 0;
-   }
+   struct gl_buffer_object **bufObjPtr = get_buffer_target(ctx, target);
+   struct gl_buffer_object *bufObj = *bufObjPtr;
 
-   /* In strict conformance to the spec, we must only return VOLATILE when
-    * when passed the VOLATILE option. Madness.
-    *
-    * XXX First fix the spec, then fix me.
-    */
-   return option == GL_VOLATILE_APPLE ? GL_VOLATILE_APPLE : retval;
+   return map_buffer_range(ctx, bufObj, 0, bufObj->Size, accessFlags,
+                           "glMapBuffer");
 }
 
-
-static GLenum
-buffer_object_unpurgeable(struct gl_context *ctx, GLuint name, GLenum option)
+void * GLAPIENTRY
+_mesa_MapBuffer(GLenum target, GLenum access)
 {
+   GET_CURRENT_CONTEXT(ctx);
    struct gl_buffer_object *bufObj;
-   GLenum retval;
-
-   bufObj = _mesa_lookup_bufferobj(ctx, name);
-   if (!bufObj) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glObjectUnpurgeable(name = 0x%x)", name);
-      return 0;
-   }
+   GLbitfield accessFlags;
 
-   if (! bufObj->Purgeable) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glObjectUnpurgeable(name = 0x%x) object is "
-                  " already \"unpurged\"", name);
-      return 0;
+   if (!get_map_buffer_access_flags(ctx, access, &accessFlags)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glMapBuffer(invalid access)");
+      return NULL;
    }
 
-   bufObj->Purgeable = GL_FALSE;
+   bufObj = get_buffer(ctx, "glMapBuffer", target, GL_INVALID_OPERATION);
+   if (!bufObj)
+      return NULL;
 
-   retval = option;
-   if (ctx->Driver.BufferObjectUnpurgeable)
-      retval = ctx->Driver.BufferObjectUnpurgeable(ctx, bufObj, option);
+   if (!validate_map_buffer_range(ctx, bufObj, 0, bufObj->Size, accessFlags,
+                                  "glMapBuffer"))
+      return NULL;
 
-   return retval;
+   return map_buffer_range(ctx, bufObj, 0, bufObj->Size, accessFlags,
+                           "glMapBuffer");
 }
 
-
-static GLenum
-renderbuffer_unpurgeable(struct gl_context *ctx, GLuint name, GLenum option)
+void * GLAPIENTRY
+_mesa_MapNamedBuffer_no_error(GLuint buffer, GLenum access)
 {
-   struct gl_renderbuffer *bufObj;
-   GLenum retval;
-
-   bufObj = _mesa_lookup_renderbuffer(ctx, name);
-   if (!bufObj) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glObjectUnpurgeable(name = 0x%x)", name);
-      return 0;
-   }
-
-   if (! bufObj->Purgeable) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glObjectUnpurgeable(name = 0x%x) object is "
-                  " already \"unpurged\"", name);
-      return 0;
-   }
+   GET_CURRENT_CONTEXT(ctx);
 
-   bufObj->Purgeable = GL_FALSE;
+   GLbitfield accessFlags;
+   get_map_buffer_access_flags(ctx, access, &accessFlags);
 
-   retval = option;
-   if (ctx->Driver.RenderObjectUnpurgeable)
-      retval = ctx->Driver.RenderObjectUnpurgeable(ctx, bufObj, option);
+   struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, buffer);
 
-   return retval;
+   return map_buffer_range(ctx, bufObj, 0, bufObj->Size, accessFlags,
+                           "glMapNamedBuffer");
 }
 
-
-static GLenum
-texture_object_unpurgeable(struct gl_context *ctx, GLuint name, GLenum option)
+void * GLAPIENTRY
+_mesa_MapNamedBuffer(GLuint buffer, GLenum access)
 {
-   struct gl_texture_object *bufObj;
-   GLenum retval;
-
-   bufObj = _mesa_lookup_texture(ctx, name);
-   if (!bufObj) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glObjectUnpurgeable(name = 0x%x)", name);
-      return 0;
-   }
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
+   GLbitfield accessFlags;
 
-   if (! bufObj->Purgeable) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glObjectUnpurgeable(name = 0x%x) object is"
-                  " already \"unpurged\"", name);
-      return 0;
+   if (!get_map_buffer_access_flags(ctx, access, &accessFlags)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glMapNamedBuffer(invalid access)");
+      return NULL;
    }
 
-   bufObj->Purgeable = GL_FALSE;
+   bufObj = _mesa_lookup_bufferobj_err(ctx, buffer, "glMapNamedBuffer");
+   if (!bufObj)
+      return NULL;
 
-   retval = option;
-   if (ctx->Driver.TextureObjectUnpurgeable)
-      retval = ctx->Driver.TextureObjectUnpurgeable(ctx, bufObj, option);
+   if (!validate_map_buffer_range(ctx, bufObj, 0, bufObj->Size, accessFlags,
+                                  "glMapNamedBuffer"))
+      return NULL;
 
-   return retval;
+   return map_buffer_range(ctx, bufObj, 0, bufObj->Size, accessFlags,
+                           "glMapNamedBuffer");
 }
 
-
-GLenum GLAPIENTRY
-_mesa_ObjectUnpurgeableAPPLE(GLenum objectType, GLuint name, GLenum option)
+void * GLAPIENTRY
+_mesa_MapNamedBufferEXT(GLuint buffer, GLenum access)
 {
    GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
 
-   if (name == 0) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glObjectUnpurgeable(name = 0x%x)", name);
-      return 0;
+   GLbitfield accessFlags;
+   if (!buffer) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glMapNamedBufferEXT(buffer=0)");
+      return NULL;
    }
-
-   switch (option) {
-   case GL_RETAINED_APPLE:
-   case GL_UNDEFINED_APPLE:
-      /* legal */
-      break;
-   default:
-      _mesa_error(ctx, GL_INVALID_ENUM,
-                  "glObjectUnpurgeable(name = 0x%x) invalid option: %d",
-                  name, option);
-      return 0;
-   }
-
-   switch (objectType) {
-   case GL_BUFFER_OBJECT_APPLE:
-      return buffer_object_unpurgeable(ctx, name, option);
-   case GL_TEXTURE:
-      return texture_object_unpurgeable(ctx, name, option);
-   case GL_RENDERBUFFER_EXT:
-      return renderbuffer_unpurgeable(ctx, name, option);
-   default:
-      _mesa_error(ctx, GL_INVALID_ENUM,
-                  "glObjectUnpurgeable(name = 0x%x) invalid type: %d",
-                  name, objectType);
-      return 0;
+   if (!get_map_buffer_access_flags(ctx, access, &accessFlags)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glMapNamedBufferEXT(invalid access)");
+      return NULL;
    }
-}
 
+   struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
+                                     &bufObj, "glMapNamedBufferEXT"))
+      return NULL;
+
+   if (!validate_map_buffer_range(ctx, bufObj, 0, bufObj->Size, accessFlags,
+                                  "glMapNamedBufferEXT"))
+      return NULL;
+
+   return map_buffer_range(ctx, bufObj, 0, bufObj->Size, accessFlags,
+                           "glMapNamedBufferEXT");
+}
 
 static void
-get_buffer_object_parameteriv(struct gl_context *ctx, GLuint name,
-                              GLenum pname, GLint *params)
+flush_mapped_buffer_range(struct gl_context *ctx,
+                          struct gl_buffer_object *bufObj,
+                          GLintptr offset, GLsizeiptr length,
+                          const char *func)
 {
-   struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, name);
-   if (!bufObj) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glGetObjectParameteriv(name = 0x%x) invalid object", name);
+   if (!ctx->Extensions.ARB_map_buffer_range) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "%s(ARB_map_buffer_range not supported)", func);
       return;
    }
 
-   switch (pname) {
-   case GL_PURGEABLE_APPLE:
-      *params = bufObj->Purgeable;
-      break;
-   default:
-      _mesa_error(ctx, GL_INVALID_ENUM,
-                  "glGetObjectParameteriv(name = 0x%x) invalid enum: %d",
-                  name, pname);
-      break;
+   if (offset < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE,
+                  "%s(offset %ld < 0)", func, (long) offset);
+      return;
    }
-}
-
 
-static void
-get_renderbuffer_parameteriv(struct gl_context *ctx, GLuint name,
-                             GLenum pname, GLint *params)
-{
-   struct gl_renderbuffer *rb = _mesa_lookup_renderbuffer(ctx, name);
-   if (!rb) {
+   if (length < 0) {
       _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glObjectUnpurgeable(name = 0x%x)", name);
+                  "%s(length %ld < 0)", func, (long) length);
       return;
    }
 
-   switch (pname) {
-   case GL_PURGEABLE_APPLE:
-      *params = rb->Purgeable;
-      break;
-   default:
-      _mesa_error(ctx, GL_INVALID_ENUM,
-                  "glGetObjectParameteriv(name = 0x%x) invalid enum: %d",
-                  name, pname);
-      break;
+   if (!_mesa_bufferobj_mapped(bufObj, MAP_USER)) {
+      /* buffer is not mapped */
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "%s(buffer is not mapped)", func);
+      return;
    }
-}
 
+   if ((bufObj->Mappings[MAP_USER].AccessFlags &
+        GL_MAP_FLUSH_EXPLICIT_BIT) == 0) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "%s(GL_MAP_FLUSH_EXPLICIT_BIT not set)", func);
+      return;
+   }
 
-static void
-get_texture_object_parameteriv(struct gl_context *ctx, GLuint name,
-                               GLenum pname, GLint *params)
-{
-   struct gl_texture_object *texObj = _mesa_lookup_texture(ctx, name);
-   if (!texObj) {
+   if (offset + length > bufObj->Mappings[MAP_USER].Length) {
       _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glObjectUnpurgeable(name = 0x%x)", name);
+                  "%s(offset %ld + length %ld > mapped length %ld)", func,
+                  (long) offset, (long) length,
+                  (long) bufObj->Mappings[MAP_USER].Length);
       return;
    }
 
-   switch (pname) {
-   case GL_PURGEABLE_APPLE:
-      *params = texObj->Purgeable;
-      break;
-   default:
-      _mesa_error(ctx, GL_INVALID_ENUM,
-                  "glGetObjectParameteriv(name = 0x%x) invalid enum: %d",
-                  name, pname);
-      break;
-   }
+   assert(bufObj->Mappings[MAP_USER].AccessFlags & GL_MAP_WRITE_BIT);
+
+   if (ctx->Driver.FlushMappedBufferRange)
+      ctx->Driver.FlushMappedBufferRange(ctx, offset, length, bufObj,
+                                         MAP_USER);
 }
 
+void GLAPIENTRY
+_mesa_FlushMappedBufferRange_no_error(GLenum target, GLintptr offset,
+                                      GLsizeiptr length)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object **bufObjPtr = get_buffer_target(ctx, target);
+   struct gl_buffer_object *bufObj = *bufObjPtr;
+
+   if (ctx->Driver.FlushMappedBufferRange)
+      ctx->Driver.FlushMappedBufferRange(ctx, offset, length, bufObj,
+                                         MAP_USER);
+}
 
 void GLAPIENTRY
-_mesa_GetObjectParameterivAPPLE(GLenum objectType, GLuint name, GLenum pname,
-                                GLint *params)
+_mesa_FlushMappedBufferRange(GLenum target, GLintptr offset,
+                             GLsizeiptr length)
 {
    GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
 
-   if (name == 0) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glGetObjectParameteriv(name = 0x%x)", name);
+   bufObj = get_buffer(ctx, "glFlushMappedBufferRange", target,
+                       GL_INVALID_OPERATION);
+   if (!bufObj)
       return;
-   }
 
-   switch (objectType) {
-   case GL_TEXTURE:
-      get_texture_object_parameteriv(ctx, name, pname, params);
-      break;
-   case GL_BUFFER_OBJECT_APPLE:
-      get_buffer_object_parameteriv(ctx, name, pname, params);
-      break;
-   case GL_RENDERBUFFER_EXT:
-      get_renderbuffer_parameteriv(ctx, name, pname, params);
-      break;
-   default:
-      _mesa_error(ctx, GL_INVALID_ENUM,
-                  "glGetObjectParameteriv(name = 0x%x) invalid type: %d",
-                  name, objectType);
-   }
+   flush_mapped_buffer_range(ctx, bufObj, offset, length,
+                             "glFlushMappedBufferRange");
 }
 
-/**
- * Binds a buffer object to a uniform buffer binding point.
- *
- * The caller is responsible for flushing vertices and updating
- * NewDriverState.
- */
-static void
-set_ubo_binding(struct gl_context *ctx,
-                struct gl_uniform_buffer_binding *binding,
-                struct gl_buffer_object *bufObj,
-                GLintptr offset,
-                GLsizeiptr size,
-                GLboolean autoSize)
+void GLAPIENTRY
+_mesa_FlushMappedNamedBufferRange_no_error(GLuint buffer, GLintptr offset,
+                                           GLsizeiptr length)
 {
-   _mesa_reference_buffer_object(ctx, &binding->BufferObject, bufObj);
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, buffer);
 
-   binding->Offset = offset;
-   binding->Size = size;
-   binding->AutomaticSize = autoSize;
+   if (ctx->Driver.FlushMappedBufferRange)
+      ctx->Driver.FlushMappedBufferRange(ctx, offset, length, bufObj,
+                                         MAP_USER);
+}
+
+void GLAPIENTRY
+_mesa_FlushMappedNamedBufferRange(GLuint buffer, GLintptr offset,
+                                  GLsizeiptr length)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
+
+   bufObj = _mesa_lookup_bufferobj_err(ctx, buffer,
+                                       "glFlushMappedNamedBufferRange");
+   if (!bufObj)
+      return;
 
-   /* If this is a real buffer object, mark it has having been used
-    * at some point as a UBO.
-    */
-   if (size >= 0)
-      bufObj->UsageHistory |= USAGE_UNIFORM_BUFFER;
+   flush_mapped_buffer_range(ctx, bufObj, offset, length,
+                             "glFlushMappedNamedBufferRange");
 }
 
-/**
- * Binds a buffer object to a uniform buffer binding point.
- *
- * Unlike set_ubo_binding(), this function also flushes vertices
- * and updates NewDriverState.  It also checks if the binding
- * has actually changed before updating it.
- */
-static void
-bind_uniform_buffer(struct gl_context *ctx,
-                    GLuint index,
-                    struct gl_buffer_object *bufObj,
-                    GLintptr offset,
-                    GLsizeiptr size,
-                    GLboolean autoSize)
+void GLAPIENTRY
+_mesa_FlushMappedNamedBufferRangeEXT(GLuint buffer, GLintptr offset,
+                                     GLsizeiptr length)
 {
-   struct gl_uniform_buffer_binding *binding =
-      &ctx->UniformBufferBindings[index];
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
 
-   if (binding->BufferObject == bufObj &&
-       binding->Offset == offset &&
-       binding->Size == size &&
-       binding->AutomaticSize == autoSize) {
+   if (!buffer) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glFlushMappedNamedBufferRangeEXT(buffer=0)");
       return;
    }
 
-   FLUSH_VERTICES(ctx, 0);
-   ctx->NewDriverState |= ctx->DriverFlags.NewUniformBuffer;
+   bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
+                                     &bufObj, "glFlushMappedNamedBufferRangeEXT"))
+      return;
+
+   flush_mapped_buffer_range(ctx, bufObj, offset, length,
+                             "glFlushMappedNamedBufferRangeEXT");
+}
 
-   set_ubo_binding(ctx, binding, bufObj, offset, size, autoSize);
+static void
+bind_buffer_range_uniform_buffer(struct gl_context *ctx, GLuint index,
+                                 struct gl_buffer_object *bufObj,
+                                 GLintptr offset, GLsizeiptr size)
+{
+   if (!bufObj) {
+      offset = -1;
+      size = -1;
+   }
+
+   _mesa_reference_buffer_object(ctx, &ctx->UniformBuffer, bufObj);
+   bind_uniform_buffer(ctx, index, bufObj, offset, size, GL_FALSE);
 }
 
 /**
@@ -2928,11 +3742,9 @@ bind_uniform_buffer(struct gl_context *ctx,
  * \param size  size of the buffer object region
  */
 static void
-bind_buffer_range_uniform_buffer(struct gl_context *ctx,
-                                GLuint index,
-                                struct gl_buffer_object *bufObj,
-                                GLintptr offset,
-                                GLsizeiptr size)
+bind_buffer_range_uniform_buffer_err(struct gl_context *ctx, GLuint index,
+                                     struct gl_buffer_object *bufObj,
+                                     GLintptr offset, GLsizeiptr size)
 {
    if (index >= ctx->Const.MaxUniformBufferBindings) {
       _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(index=%d)", index);
@@ -2946,106 +3758,93 @@ bind_buffer_range_uniform_buffer(struct gl_context *ctx,
       return;
    }
 
-   if (bufObj == ctx->Shared->NullBufferObj) {
+   bind_buffer_range_uniform_buffer(ctx, index, bufObj, offset, size);
+}
+
+static void
+bind_buffer_range_shader_storage_buffer(struct gl_context *ctx,
+                                        GLuint index,
+                                        struct gl_buffer_object *bufObj,
+                                        GLintptr offset,
+                                        GLsizeiptr size)
+{
+   if (!bufObj) {
       offset = -1;
       size = -1;
    }
 
-   _mesa_reference_buffer_object(ctx, &ctx->UniformBuffer, bufObj);
-   bind_uniform_buffer(ctx, index, bufObj, offset, size, GL_FALSE);
+   _mesa_reference_buffer_object(ctx, &ctx->ShaderStorageBuffer, bufObj);
+   bind_shader_storage_buffer(ctx, index, bufObj, offset, size, GL_FALSE);
 }
 
-
 /**
- * Bind a buffer object to a uniform block binding point.
- * As above, but offset = 0.
+ * Bind a region of a buffer object to a shader storage block binding point.
+ * \param index  the shader storage buffer binding point index
+ * \param bufObj  the buffer object
+ * \param offset  offset to the start of buffer object region
+ * \param size  size of the buffer object region
  */
 static void
-bind_buffer_base_uniform_buffer(struct gl_context *ctx,
-                               GLuint index,
-                               struct gl_buffer_object *bufObj)
+bind_buffer_range_shader_storage_buffer_err(struct gl_context *ctx,
+                                            GLuint index,
+                                            struct gl_buffer_object *bufObj,
+                                            GLintptr offset, GLsizeiptr size)
 {
-   if (index >= ctx->Const.MaxUniformBufferBindings) {
-      _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferBase(index=%d)", index);
+   if (index >= ctx->Const.MaxShaderStorageBufferBindings) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(index=%d)", index);
       return;
    }
 
-   _mesa_reference_buffer_object(ctx, &ctx->UniformBuffer, bufObj);
+   if (offset & (ctx->Const.ShaderStorageBufferOffsetAlignment - 1)) {
+      _mesa_error(ctx, GL_INVALID_VALUE,
+                  "glBindBufferRange(offset misaligned %d/%d)", (int) offset,
+                  ctx->Const.ShaderStorageBufferOffsetAlignment);
+      return;
+   }
 
-   if (bufObj == ctx->Shared->NullBufferObj)
-      bind_uniform_buffer(ctx, index, bufObj, -1, -1, GL_TRUE);
-   else
-      bind_uniform_buffer(ctx, index, bufObj, 0, 0, GL_TRUE);
+   bind_buffer_range_shader_storage_buffer(ctx, index, bufObj, offset, size);
 }
 
-/**
- * Binds a buffer object to an atomic buffer binding point.
- *
- * The caller is responsible for validating the offset,
- * flushing the vertices and updating NewDriverState.
- */
 static void
-set_atomic_buffer_binding(struct gl_context *ctx,
-                          struct gl_atomic_buffer_binding *binding,
-                          struct gl_buffer_object *bufObj,
-                          GLintptr offset,
-                          GLsizeiptr size)
+bind_buffer_range_atomic_buffer(struct gl_context *ctx, GLuint index,
+                                 struct gl_buffer_object *bufObj,
+                                 GLintptr offset, GLsizeiptr size)
 {
-   _mesa_reference_buffer_object(ctx, &binding->BufferObject, bufObj);
-
-   if (bufObj == ctx->Shared->NullBufferObj) {
-      binding->Offset = -1;
-      binding->Size = -1;
-   } else {
-      binding->Offset = offset;
-      binding->Size = size;
-      bufObj->UsageHistory |= USAGE_ATOMIC_COUNTER_BUFFER;
+   if (!bufObj) {
+      offset = -1;
+      size = -1;
    }
+
+   _mesa_reference_buffer_object(ctx, &ctx->AtomicBuffer, bufObj);
+   bind_atomic_buffer(ctx, index, bufObj, offset, size, GL_FALSE);
 }
 
 /**
- * Binds a buffer object to an atomic buffer binding point.
- *
- * Unlike set_atomic_buffer_binding(), this function also validates the
- * index and offset, flushes vertices, and updates NewDriverState.
- * It also checks if the binding has actually changing before
- * updating it.
+ * Bind a region of a buffer object to an atomic storage block binding point.
+ * \param index  the shader storage buffer binding point index
+ * \param bufObj  the buffer object
+ * \param offset  offset to the start of buffer object region
+ * \param size  size of the buffer object region
  */
 static void
-bind_atomic_buffer(struct gl_context *ctx,
-                   unsigned index,
-                   struct gl_buffer_object *bufObj,
-                   GLintptr offset,
-                   GLsizeiptr size,
-                   const char *name)
+bind_buffer_range_atomic_buffer_err(struct gl_context *ctx,
+                                    GLuint index,
+                                    struct gl_buffer_object *bufObj,
+                                    GLintptr offset, GLsizeiptr size)
 {
-   struct gl_atomic_buffer_binding *binding;
-
    if (index >= ctx->Const.MaxAtomicBufferBindings) {
-      _mesa_error(ctx, GL_INVALID_VALUE, "%s(index=%d)", name, index);
+      _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(index=%d)", index);
       return;
    }
 
    if (offset & (ATOMIC_COUNTER_SIZE - 1)) {
       _mesa_error(ctx, GL_INVALID_VALUE,
-                  "%s(offset misaligned %d/%d)", name, (int) offset,
-                  ATOMIC_COUNTER_SIZE);
-      return;
-   }
-
-   _mesa_reference_buffer_object(ctx, &ctx->AtomicBuffer, bufObj);
-
-   binding = &ctx->AtomicBufferBindings[index];
-   if (binding->BufferObject == bufObj &&
-       binding->Offset == offset &&
-       binding->Size == size) {
+                 "glBindBufferRange(offset misaligned %d/%d)", (int) offset,
+                 ATOMIC_COUNTER_SIZE);
       return;
    }
 
-   FLUSH_VERTICES(ctx, 0);
-   ctx->NewDriverState |= ctx->DriverFlags.NewAtomicBuffer;
-
-   set_atomic_buffer_binding(ctx, binding, bufObj, offset, size);
+   bind_buffer_range_atomic_buffer(ctx, index, bufObj, offset, size);
 }
 
 static inline bool
@@ -3055,11 +3854,11 @@ bind_buffers_check_offset_and_size(struct gl_context *ctx,
                                    const GLsizeiptr *sizes)
 {
    if (offsets[index] < 0) {
-     /* The ARB_multi_bind spec says:
-      *
-      *    "An INVALID_VALUE error is generated by BindBuffersRange if any
-      *     value in <offsets> is less than zero (per binding)."
-      */
+      /* The ARB_multi_bind spec says:
+       *
+       *    "An INVALID_VALUE error is generated by BindBuffersRange if any
+       *     value in <offsets> is less than zero (per binding)."
+       */
       _mesa_error(ctx, GL_INVALID_VALUE,
                   "glBindBuffersRange(offsets[%u]=%" PRId64 " < 0)",
                   index, (int64_t) offsets[index]);
@@ -3067,11 +3866,11 @@ bind_buffers_check_offset_and_size(struct gl_context *ctx,
    }
 
    if (sizes[index] <= 0) {
-     /* The ARB_multi_bind spec says:
-      *
-      *     "An INVALID_VALUE error is generated by BindBuffersRange if any
-      *      value in <sizes> is less than or equal to zero (per binding)."
-      */
+      /* The ARB_multi_bind spec says:
+       *
+       *     "An INVALID_VALUE error is generated by BindBuffersRange if any
+       *      value in <sizes> is less than or equal to zero (per binding)."
+       */
       _mesa_error(ctx, GL_INVALID_VALUE,
                   "glBindBuffersRange(sizes[%u]=%" PRId64 " <= 0)",
                   index, (int64_t) sizes[index]);
@@ -3110,6 +3909,35 @@ error_check_bind_uniform_buffers(struct gl_context *ctx,
    return true;
 }
 
+static bool
+error_check_bind_shader_storage_buffers(struct gl_context *ctx,
+                                        GLuint first, GLsizei count,
+                                        const char *caller)
+{
+   if (!ctx->Extensions.ARB_shader_storage_buffer_object) {
+      _mesa_error(ctx, GL_INVALID_ENUM,
+                  "%s(target=GL_SHADER_STORAGE_BUFFER)", caller);
+      return false;
+   }
+
+   /* The ARB_multi_bind_spec says:
+    *
+    *     "An INVALID_OPERATION error is generated if <first> + <count> is
+    *      greater than the number of target-specific indexed binding points,
+    *      as described in section 6.7.1."
+    */
+   if (first + count > ctx->Const.MaxShaderStorageBufferBindings) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "%s(first=%u + count=%d > the value of "
+                  "GL_MAX_SHADER_STORAGE_BUFFER_BINDINGS=%u)",
+                  caller, first, count,
+                  ctx->Const.MaxShaderStorageBufferBindings);
+      return false;
+   }
+
+   return true;
+}
+
 /**
  * Unbind all uniform buffers in the range
  * <first> through <first>+<count>-1
@@ -3117,21 +3945,32 @@ error_check_bind_uniform_buffers(struct gl_context *ctx,
 static void
 unbind_uniform_buffers(struct gl_context *ctx, GLuint first, GLsizei count)
 {
-   struct gl_buffer_object *bufObj = ctx->Shared->NullBufferObj;
-   GLint i;
-
-   for (i = 0; i < count; i++)
-      set_ubo_binding(ctx, &ctx->UniformBufferBindings[first + i],
-                      bufObj, -1, -1, GL_TRUE);
+   for (int i = 0; i < count; i++)
+      set_buffer_binding(ctx, &ctx->UniformBufferBindings[first + i],
+                         NULL, -1, -1, GL_TRUE, 0);
 }
 
+/**
+ * Unbind all shader storage buffers in the range
+ * <first> through <first>+<count>-1
+ */
 static void
-bind_uniform_buffers_base(struct gl_context *ctx, GLuint first, GLsizei count,
-                          const GLuint *buffers)
+unbind_shader_storage_buffers(struct gl_context *ctx, GLuint first,
+                              GLsizei count)
 {
-   GLint i;
+   for (int i = 0; i < count; i++)
+      set_buffer_binding(ctx, &ctx->ShaderStorageBufferBindings[first + i],
+                         NULL, -1, -1, GL_TRUE, 0);
+}
 
-   if (!error_check_bind_uniform_buffers(ctx, first, count, "glBindBuffersBase"))
+static void
+bind_uniform_buffers(struct gl_context *ctx, GLuint first, GLsizei count,
+                     const GLuint *buffers,
+                     bool range,
+                     const GLintptr *offsets, const GLsizeiptr *sizes,
+                     const char *caller)
+{
+   if (!error_check_bind_uniform_buffers(ctx, first, count, caller))
       return;
 
    /* Assume that at least one binding will be changed */
@@ -3141,8 +3980,11 @@ bind_uniform_buffers_base(struct gl_context *ctx, GLuint first, GLsizei count,
    if (!buffers) {
       /* The ARB_multi_bind spec says:
        *
-       *   "If <buffers> is NULL, all bindings from <first> through
-       *    <first>+<count>-1 are reset to their unbound (zero) state."
+       *    "If <buffers> is NULL, all bindings from <first> through
+       *     <first>+<count>-1 are reset to their unbound (zero) state.
+       *     In this case, the offsets and sizes associated with the
+       *     binding points are set to default values, ignoring
+       *     <offsets> and <sizes>."
        */
       unbind_uniform_buffers(ctx, first, count);
       return;
@@ -3167,44 +4009,74 @@ bind_uniform_buffers_base(struct gl_context *ctx, GLuint first, GLsizei count,
     *       parameters are valid and no other error occurs."
     */
 
-   _mesa_begin_bufferobj_lookups(ctx);
+   _mesa_HashLockMutex(ctx->Shared->BufferObjects);
 
-   for (i = 0; i < count; i++) {
-      struct gl_uniform_buffer_binding *binding =
-          &ctx->UniformBufferBindings[first + i];
-      struct gl_buffer_object *bufObj;
+   for (int i = 0; i < count; i++) {
+      struct gl_buffer_binding *binding =
+         &ctx->UniformBufferBindings[first + i];
+      GLintptr offset = 0;
+      GLsizeiptr size = 0;
 
-      if (binding->BufferObject && binding->BufferObject->Name == buffers[i])
-         bufObj = binding->BufferObject;
-      else
-         bufObj = _mesa_multi_bind_lookup_bufferobj(ctx, buffers, i,
-                                                    "glBindBuffersBase");
+      if (range) {
+         if (!bind_buffers_check_offset_and_size(ctx, i, offsets, sizes))
+            continue;
 
-      if (bufObj) {
-         if (bufObj == ctx->Shared->NullBufferObj)
-            set_ubo_binding(ctx, binding, bufObj, -1, -1, GL_TRUE);
-         else
-            set_ubo_binding(ctx, binding, bufObj, 0, 0, GL_TRUE);
+         /* The ARB_multi_bind spec says:
+          *
+          *     "An INVALID_VALUE error is generated by BindBuffersRange if any
+          *      pair of values in <offsets> and <sizes> does not respectively
+          *      satisfy the constraints described for those parameters for the
+          *      specified target, as described in section 6.7.1 (per binding)."
+          *
+          * Section 6.7.1 refers to table 6.5, which says:
+          *
+          *     "┌───────────────────────────────────────────────────────────────┐
+          *      │ Uniform buffer array bindings (see sec. 7.6)                  │
+          *      ├─────────────────────┬─────────────────────────────────────────┤
+          *      │  ...                │  ...                                    │
+          *      │  offset restriction │  multiple of value of UNIFORM_BUFFER_-  │
+          *      │                     │  OFFSET_ALIGNMENT                       │
+          *      │  ...                │  ...                                    │
+          *      │  size restriction   │  none                                   │
+          *      └─────────────────────┴─────────────────────────────────────────┘"
+          */
+         if (offsets[i] & (ctx->Const.UniformBufferOffsetAlignment - 1)) {
+            _mesa_error(ctx, GL_INVALID_VALUE,
+                        "glBindBuffersRange(offsets[%u]=%" PRId64
+                        " is misaligned; it must be a multiple of the value of "
+                        "GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT=%u when "
+                        "target=GL_UNIFORM_BUFFER)",
+                        i, (int64_t) offsets[i],
+                        ctx->Const.UniformBufferOffsetAlignment);
+            continue;
+         }
+
+         offset = offsets[i];
+         size = sizes[i];
       }
+
+      set_buffer_multi_binding(ctx, buffers, i, caller,
+                               binding, offset, size, range,
+                               USAGE_UNIFORM_BUFFER);
    }
 
-   _mesa_end_bufferobj_lookups(ctx);
+   _mesa_HashUnlockMutex(ctx->Shared->BufferObjects);
 }
 
 static void
-bind_uniform_buffers_range(struct gl_context *ctx, GLuint first, GLsizei count,
-                           const GLuint *buffers,
-                           const GLintptr *offsets, const GLsizeiptr *sizes)
+bind_shader_storage_buffers(struct gl_context *ctx, GLuint first,
+                            GLsizei count, const GLuint *buffers,
+                            bool range,
+                            const GLintptr *offsets,
+                            const GLsizeiptr *sizes,
+                            const char *caller)
 {
-   GLint i;
-
-   if (!error_check_bind_uniform_buffers(ctx, first, count,
-                                         "glBindBuffersRange"))
+   if (!error_check_bind_shader_storage_buffers(ctx, first, count, caller))
       return;
 
    /* Assume that at least one binding will be changed */
    FLUSH_VERTICES(ctx, 0);
-   ctx->NewDriverState |= ctx->DriverFlags.NewUniformBuffer;
+   ctx->NewDriverState |= ctx->DriverFlags.NewShaderStorageBuffer;
 
    if (!buffers) {
       /* The ARB_multi_bind spec says:
@@ -3215,7 +4087,7 @@ bind_uniform_buffers_range(struct gl_context *ctx, GLuint first, GLsizei count,
        *     binding points are set to default values, ignoring
        *     <offsets> and <sizes>."
        */
-      unbind_uniform_buffers(ctx, first, count);
+      unbind_shader_storage_buffers(ctx, first, count);
       return;
    }
 
@@ -3238,62 +4110,58 @@ bind_uniform_buffers_range(struct gl_context *ctx, GLuint first, GLsizei count,
     *       parameters are valid and no other error occurs."
     */
 
-   _mesa_begin_bufferobj_lookups(ctx);
-
-   for (i = 0; i < count; i++) {
-      struct gl_uniform_buffer_binding *binding =
-         &ctx->UniformBufferBindings[first + i];
-      struct gl_buffer_object *bufObj;
+   _mesa_HashLockMutex(ctx->Shared->BufferObjects);
 
-      if (!bind_buffers_check_offset_and_size(ctx, i, offsets, sizes))
-         continue;
+   for (int i = 0; i < count; i++) {
+      struct gl_buffer_binding *binding =
+         &ctx->ShaderStorageBufferBindings[first + i];
+      GLintptr offset = 0;
+      GLsizeiptr size = 0;
+
+      if (range) {
+         if (!bind_buffers_check_offset_and_size(ctx, i, offsets, sizes))
+            continue;
+
+         /* The ARB_multi_bind spec says:
+         *
+         *     "An INVALID_VALUE error is generated by BindBuffersRange if any
+         *      pair of values in <offsets> and <sizes> does not respectively
+         *      satisfy the constraints described for those parameters for the
+         *      specified target, as described in section 6.7.1 (per binding)."
+         *
+         * Section 6.7.1 refers to table 6.5, which says:
+         *
+         *     "┌───────────────────────────────────────────────────────────────┐
+         *      │ Shader storage buffer array bindings (see sec. 7.8)           │
+         *      ├─────────────────────┬─────────────────────────────────────────┤
+         *      │  ...                │  ...                                    │
+         *      │  offset restriction │  multiple of value of SHADER_STORAGE_-  │
+         *      │                     │  BUFFER_OFFSET_ALIGNMENT                │
+         *      │  ...                │  ...                                    │
+         *      │  size restriction   │  none                                   │
+         *      └─────────────────────┴─────────────────────────────────────────┘"
+         */
+         if (offsets[i] & (ctx->Const.ShaderStorageBufferOffsetAlignment - 1)) {
+            _mesa_error(ctx, GL_INVALID_VALUE,
+                        "glBindBuffersRange(offsets[%u]=%" PRId64
+                        " is misaligned; it must be a multiple of the value of "
+                        "GL_SHADER_STORAGE_BUFFER_OFFSET_ALIGNMENT=%u when "
+                        "target=GL_SHADER_STORAGE_BUFFER)",
+                        i, (int64_t) offsets[i],
+                        ctx->Const.ShaderStorageBufferOffsetAlignment);
+            continue;
+         }
 
-      /* The ARB_multi_bind spec says:
-       *
-       *     "An INVALID_VALUE error is generated by BindBuffersRange if any
-       *      pair of values in <offsets> and <sizes> does not respectively
-       *      satisfy the constraints described for those parameters for the
-       *      specified target, as described in section 6.7.1 (per binding)."
-       *
-       * Section 6.7.1 refers to table 6.5, which says:
-       *
-       *     "┌───────────────────────────────────────────────────────────────┐
-       *      │ Uniform buffer array bindings (see sec. 7.6)                  │
-       *      ├─────────────────────┬─────────────────────────────────────────┤
-       *      │  ...                │  ...                                    │
-       *      │  offset restriction │  multiple of value of UNIFORM_BUFFER_-  │
-       *      │                     │  OFFSET_ALIGNMENT                       │
-       *      │  ...                │  ...                                    │
-       *      │  size restriction   │  none                                   │
-       *      └─────────────────────┴─────────────────────────────────────────┘"
-       */
-      if (offsets[i] & (ctx->Const.UniformBufferOffsetAlignment - 1)) {
-         _mesa_error(ctx, GL_INVALID_VALUE,
-                     "glBindBuffersRange(offsets[%u]=%" PRId64
-                     " is misaligned; it must be a multiple of the value of "
-                     "GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT=%u when "
-                     "target=GL_UNIFORM_BUFFER)",
-                     i, (int64_t) offsets[i],
-                     ctx->Const.UniformBufferOffsetAlignment);
-         continue;
+         offset = offsets[i];
+         size = sizes[i];
       }
 
-      if (binding->BufferObject && binding->BufferObject->Name == buffers[i])
-         bufObj = binding->BufferObject;
-      else
-         bufObj = _mesa_multi_bind_lookup_bufferobj(ctx, buffers, i,
-                                                    "glBindBuffersRange");
-
-      if (bufObj) {
-         if (bufObj == ctx->Shared->NullBufferObj)
-            set_ubo_binding(ctx, binding, bufObj, -1, -1, GL_FALSE);
-         else
-            set_ubo_binding(ctx, binding, bufObj,
-                            offsets[i], sizes[i], GL_FALSE);
-      }
+      set_buffer_multi_binding(ctx, buffers, i, caller,
+                               binding, offset, size, range,
+                               USAGE_SHADER_STORAGE_BUFFER);
    }
 
-   _mesa_end_bufferobj_lookups(ctx);
+   _mesa_HashUnlockMutex(ctx->Shared->BufferObjects);
 }
 
 static bool
@@ -3322,123 +4190,54 @@ error_check_bind_xfb_buffers(struct gl_context *ctx,
       _mesa_error(ctx, GL_INVALID_OPERATION,
                   "%s(Changing transform feedback buffers while "
                   "transform feedback is active)", caller);
-      return false;
-   }
-
-   /* The ARB_multi_bind_spec says:
-    *
-    *     "An INVALID_OPERATION error is generated if <first> + <count> is
-    *      greater than the number of target-specific indexed binding points,
-    *      as described in section 6.7.1."
-    */
-   if (first + count > ctx->Const.MaxTransformFeedbackBuffers) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "%s(first=%u + count=%d > the value of "
-                  "GL_MAX_TRANSFORM_FEEDBACK_BUFFERS=%u)",
-                  caller, first, count,
-                  ctx->Const.MaxTransformFeedbackBuffers);
-      return false;
-   }
-
-   return true;
-}
-
-/**
- * Unbind all transform feedback buffers in the range
- * <first> through <first>+<count>-1
- */
-static void
-unbind_xfb_buffers(struct gl_context *ctx,
-                   struct gl_transform_feedback_object *tfObj,
-                   GLuint first, GLsizei count)
-{
-   struct gl_buffer_object * const bufObj = ctx->Shared->NullBufferObj;
-   GLint i;
-
-   for (i = 0; i < count; i++)
-      _mesa_set_transform_feedback_binding(ctx, tfObj, first + i,
-                                           bufObj, 0, 0);
-}
-
-static void
-bind_xfb_buffers_base(struct gl_context *ctx,
-                      GLuint first, GLsizei count,
-                      const GLuint *buffers)
-{
-   struct gl_transform_feedback_object *tfObj =
-      ctx->TransformFeedback.CurrentObject;
-   GLint i;
-
-   if (!error_check_bind_xfb_buffers(ctx, tfObj, first, count,
-                                     "glBindBuffersBase"))
-      return;
-
-   /* Assume that at least one binding will be changed */
-   FLUSH_VERTICES(ctx, 0);
-   ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedback;
-
-   if (!buffers) {
-      /* The ARB_multi_bind spec says:
-       *
-       *   "If <buffers> is NULL, all bindings from <first> through
-       *    <first>+<count>-1 are reset to their unbound (zero) state."
-       */
-      unbind_xfb_buffers(ctx, tfObj, first, count);
-      return;
-   }
-
-   /* Note that the error semantics for multi-bind commands differ from
-    * those of other GL commands.
-    *
-    * The Issues section in the ARB_multi_bind spec says:
-    *
-    *    "(11) Typically, OpenGL specifies that if an error is generated by a
-    *          command, that command has no effect.  This is somewhat
-    *          unfortunate for multi-bind commands, because it would require a
-    *          first pass to scan the entire list of bound objects for errors
-    *          and then a second pass to actually perform the bindings.
-    *          Should we have different error semantics?
-    *
-    *       RESOLVED:  Yes.  In this specification, when the parameters for
-    *       one of the <count> binding points are invalid, that binding point
-    *       is not updated and an error will be generated.  However, other
-    *       binding points in the same command will be updated if their
-    *       parameters are valid and no other error occurs."
-    */
-
-   _mesa_begin_bufferobj_lookups(ctx);
-
-   for (i = 0; i < count; i++) {
-      struct gl_buffer_object * const boundBufObj = tfObj->Buffers[first + i];
-      struct gl_buffer_object *bufObj;
-
-      if (boundBufObj && boundBufObj->Name == buffers[i])
-         bufObj = boundBufObj;
-      else
-         bufObj = _mesa_multi_bind_lookup_bufferobj(ctx, buffers, i,
-                                                    "glBindBuffersBase");
+      return false;
+   }
 
-      if (bufObj)
-         _mesa_set_transform_feedback_binding(ctx, tfObj, first + i,
-                                              bufObj, 0, 0);
+   /* The ARB_multi_bind_spec says:
+    *
+    *     "An INVALID_OPERATION error is generated if <first> + <count> is
+    *      greater than the number of target-specific indexed binding points,
+    *      as described in section 6.7.1."
+    */
+   if (first + count > ctx->Const.MaxTransformFeedbackBuffers) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "%s(first=%u + count=%d > the value of "
+                  "GL_MAX_TRANSFORM_FEEDBACK_BUFFERS=%u)",
+                  caller, first, count,
+                  ctx->Const.MaxTransformFeedbackBuffers);
+      return false;
    }
 
-   _mesa_end_bufferobj_lookups(ctx);
+   return true;
+}
+
+/**
+ * Unbind all transform feedback buffers in the range
+ * <first> through <first>+<count>-1
+ */
+static void
+unbind_xfb_buffers(struct gl_context *ctx,
+                   struct gl_transform_feedback_object *tfObj,
+                   GLuint first, GLsizei count)
+{
+   for (int i = 0; i < count; i++)
+      _mesa_set_transform_feedback_binding(ctx, tfObj, first + i,
+                                           NULL, 0, 0);
 }
 
 static void
-bind_xfb_buffers_range(struct gl_context *ctx,
-                       GLuint first, GLsizei count,
-                       const GLuint *buffers,
-                       const GLintptr *offsets,
-                       const GLsizeiptr *sizes)
+bind_xfb_buffers(struct gl_context *ctx,
+                 GLuint first, GLsizei count,
+                 const GLuint *buffers,
+                 bool range,
+                 const GLintptr *offsets,
+                 const GLsizeiptr *sizes,
+                 const char *caller)
 {
    struct gl_transform_feedback_object *tfObj =
        ctx->TransformFeedback.CurrentObject;
-   GLint i;
 
-   if (!error_check_bind_xfb_buffers(ctx, tfObj, first, count,
-                                     "glBindBuffersRange"))
+   if (!error_check_bind_xfb_buffers(ctx, tfObj, first, count, caller))
       return;
 
    /* Assume that at least one binding will be changed */
@@ -3477,64 +4276,74 @@ bind_xfb_buffers_range(struct gl_context *ctx,
     *       parameters are valid and no other error occurs."
     */
 
-   _mesa_begin_bufferobj_lookups(ctx);
+   _mesa_HashLockMutex(ctx->Shared->BufferObjects);
 
-   for (i = 0; i < count; i++) {
+   for (int i = 0; i < count; i++) {
       const GLuint index = first + i;
       struct gl_buffer_object * const boundBufObj = tfObj->Buffers[index];
       struct gl_buffer_object *bufObj;
+      GLintptr offset = 0;
+      GLsizeiptr size = 0;
 
-      if (!bind_buffers_check_offset_and_size(ctx, i, offsets, sizes))
-         continue;
+      if (range) {
+         if (!bind_buffers_check_offset_and_size(ctx, i, offsets, sizes))
+            continue;
 
-      /* The ARB_multi_bind spec says:
-       *
-       *     "An INVALID_VALUE error is generated by BindBuffersRange if any
-       *      pair of values in <offsets> and <sizes> does not respectively
-       *      satisfy the constraints described for those parameters for the
-       *      specified target, as described in section 6.7.1 (per binding)."
-       *
-       * Section 6.7.1 refers to table 6.5, which says:
-       *
-       *     "┌───────────────────────────────────────────────────────────────┐
-       *      │ Transform feedback array bindings (see sec. 13.2.2)           │
-       *      ├───────────────────────┬───────────────────────────────────────┤
-       *      │    ...                │    ...                                │
-       *      │    offset restriction │    multiple of 4                      │
-       *      │    ...                │    ...                                │
-       *      │    size restriction   │    multiple of 4                      │
-       *      └───────────────────────┴───────────────────────────────────────┘"
-       */
-      if (offsets[i] & 0x3) {
-         _mesa_error(ctx, GL_INVALID_VALUE,
-                     "glBindBuffersRange(offsets[%u]=%" PRId64
-                     " is misaligned; it must be a multiple of 4 when "
-                     "target=GL_TRANSFORM_FEEDBACK_BUFFER)",
-                     i, (int64_t) offsets[i]);
-         continue;
-      }
+         /* The ARB_multi_bind spec says:
+          *
+          *     "An INVALID_VALUE error is generated by BindBuffersRange if any
+          *      pair of values in <offsets> and <sizes> does not respectively
+          *      satisfy the constraints described for those parameters for the
+          *      specified target, as described in section 6.7.1 (per binding)."
+          *
+          * Section 6.7.1 refers to table 6.5, which says:
+          *
+          *     "┌───────────────────────────────────────────────────────────────┐
+          *      │ Transform feedback array bindings (see sec. 13.2.2)           │
+          *      ├───────────────────────┬───────────────────────────────────────┤
+          *      │    ...                │    ...                                │
+          *      │    offset restriction │    multiple of 4                      │
+          *      │    ...                │    ...                                │
+          *      │    size restriction   │    multiple of 4                      │
+          *      └───────────────────────┴───────────────────────────────────────┘"
+          */
+         if (offsets[i] & 0x3) {
+            _mesa_error(ctx, GL_INVALID_VALUE,
+                        "glBindBuffersRange(offsets[%u]=%" PRId64
+                        " is misaligned; it must be a multiple of 4 when "
+                        "target=GL_TRANSFORM_FEEDBACK_BUFFER)",
+                        i, (int64_t) offsets[i]);
+            continue;
+         }
 
-      if (sizes[i] & 0x3) {
-         _mesa_error(ctx, GL_INVALID_VALUE,
-                     "glBindBuffersRange(sizes[%u]=%" PRId64
-                     " is misaligned; it must be a multiple of 4 when "
-                     "target=GL_TRANSFORM_FEEDBACK_BUFFER)",
-                     i, (int64_t) sizes[i]);
-         continue;
+         if (sizes[i] & 0x3) {
+            _mesa_error(ctx, GL_INVALID_VALUE,
+                        "glBindBuffersRange(sizes[%u]=%" PRId64
+                        " is misaligned; it must be a multiple of 4 when "
+                        "target=GL_TRANSFORM_FEEDBACK_BUFFER)",
+                        i, (int64_t) sizes[i]);
+            continue;
+         }
+
+         offset = offsets[i];
+         size = sizes[i];
       }
 
       if (boundBufObj && boundBufObj->Name == buffers[i])
          bufObj = boundBufObj;
-      else
-         bufObj = _mesa_multi_bind_lookup_bufferobj(ctx, buffers, i,
-                                                    "glBindBuffersRange");
+      else {
+         bool error;
+         bufObj = _mesa_multi_bind_lookup_bufferobj(ctx, buffers, i, caller,
+                                                    &error);
+         if (error)
+            continue;
+      }
 
-      if (bufObj)
-         _mesa_set_transform_feedback_binding(ctx, tfObj, index, bufObj,
-                                              offsets[i], sizes[i]);
+      _mesa_set_transform_feedback_binding(ctx, tfObj, index, bufObj,
+                                           offset, size);
    }
 
-   _mesa_end_bufferobj_lookups(ctx);
+   _mesa_HashUnlockMutex(ctx->Shared->BufferObjects);
 }
 
 static bool
@@ -3572,91 +4381,22 @@ error_check_bind_atomic_buffers(struct gl_context *ctx,
 static void
 unbind_atomic_buffers(struct gl_context *ctx, GLuint first, GLsizei count)
 {
-   struct gl_buffer_object * const bufObj = ctx->Shared->NullBufferObj;
-   GLint i;
-
-   for (i = 0; i < count; i++)
-      set_atomic_buffer_binding(ctx, &ctx->AtomicBufferBindings[first + i],
-                                bufObj, -1, -1);
-}
-
-static void
-bind_atomic_buffers_base(struct gl_context *ctx,
-                         GLuint first,
-                         GLsizei count,
-                         const GLuint *buffers)
-{
-   GLint i;
-
-   if (!error_check_bind_atomic_buffers(ctx, first, count,
-                                        "glBindBuffersBase"))
-     return;
-
-   /* Assume that at least one binding will be changed */
-   FLUSH_VERTICES(ctx, 0);
-   ctx->NewDriverState |= ctx->DriverFlags.NewAtomicBuffer;
-
-   if (!buffers) {
-      /* The ARB_multi_bind spec says:
-       *
-       *   "If <buffers> is NULL, all bindings from <first> through
-       *    <first>+<count>-1 are reset to their unbound (zero) state."
-       */
-      unbind_atomic_buffers(ctx, first, count);
-      return;
-   }
-
-   /* Note that the error semantics for multi-bind commands differ from
-    * those of other GL commands.
-    *
-    * The Issues section in the ARB_multi_bind spec says:
-    *
-    *    "(11) Typically, OpenGL specifies that if an error is generated by a
-    *          command, that command has no effect.  This is somewhat
-    *          unfortunate for multi-bind commands, because it would require a
-    *          first pass to scan the entire list of bound objects for errors
-    *          and then a second pass to actually perform the bindings.
-    *          Should we have different error semantics?
-    *
-    *       RESOLVED:  Yes.  In this specification, when the parameters for
-    *       one of the <count> binding points are invalid, that binding point
-    *       is not updated and an error will be generated.  However, other
-    *       binding points in the same command will be updated if their
-    *       parameters are valid and no other error occurs."
-    */
-
-   _mesa_begin_bufferobj_lookups(ctx);
-
-   for (i = 0; i < count; i++) {
-      struct gl_atomic_buffer_binding *binding =
-         &ctx->AtomicBufferBindings[first + i];
-      struct gl_buffer_object *bufObj;
-
-      if (binding->BufferObject && binding->BufferObject->Name == buffers[i])
-         bufObj = binding->BufferObject;
-      else
-         bufObj = _mesa_multi_bind_lookup_bufferobj(ctx, buffers, i,
-                                                    "glBindBuffersBase");
-
-      if (bufObj)
-         set_atomic_buffer_binding(ctx, binding, bufObj, 0, 0);
-   }
-
-   _mesa_end_bufferobj_lookups(ctx);
+   for (int i = 0; i < count; i++)
+      set_buffer_binding(ctx, &ctx->AtomicBufferBindings[first + i],
+                         NULL, -1, -1, GL_TRUE, 0);
 }
 
 static void
-bind_atomic_buffers_range(struct gl_context *ctx,
-                          GLuint first,
-                          GLsizei count,
-                          const GLuint *buffers,
-                          const GLintptr *offsets,
-                          const GLsizeiptr *sizes)
+bind_atomic_buffers(struct gl_context *ctx,
+                    GLuint first,
+                    GLsizei count,
+                    const GLuint *buffers,
+                    bool range,
+                    const GLintptr *offsets,
+                    const GLsizeiptr *sizes,
+                    const char *caller)
 {
-   GLint i;
-
-   if (!error_check_bind_atomic_buffers(ctx, first, count,
-                                        "glBindBuffersRange"))
+   if (!error_check_bind_atomic_buffers(ctx, first, count, caller))
      return;
 
    /* Assume that at least one binding will be changed */
@@ -3695,123 +4435,181 @@ bind_atomic_buffers_range(struct gl_context *ctx,
     *       parameters are valid and no other error occurs."
     */
 
-   _mesa_begin_bufferobj_lookups(ctx);
+   _mesa_HashLockMutex(ctx->Shared->BufferObjects);
 
-   for (i = 0; i < count; i++) {
-      struct gl_atomic_buffer_binding *binding =
+   for (int i = 0; i < count; i++) {
+      struct gl_buffer_binding *binding =
          &ctx->AtomicBufferBindings[first + i];
-      struct gl_buffer_object *bufObj;
+      GLintptr offset = 0;
+      GLsizeiptr size = 0;
 
-      if (!bind_buffers_check_offset_and_size(ctx, i, offsets, sizes))
-         continue;
+      if (range) {
+         if (!bind_buffers_check_offset_and_size(ctx, i, offsets, sizes))
+            continue;
 
-      /* The ARB_multi_bind spec says:
-       *
-       *     "An INVALID_VALUE error is generated by BindBuffersRange if any
-       *      pair of values in <offsets> and <sizes> does not respectively
-       *      satisfy the constraints described for those parameters for the
-       *      specified target, as described in section 6.7.1 (per binding)."
-       *
-       * Section 6.7.1 refers to table 6.5, which says:
-       *
-       *     "┌───────────────────────────────────────────────────────────────┐
-       *      │ Atomic counter array bindings (see sec. 7.7.2)                │
-       *      ├───────────────────────┬───────────────────────────────────────┤
-       *      │    ...                │    ...                                │
-       *      │    offset restriction │    multiple of 4                      │
-       *      │    ...                │    ...                                │
-       *      │    size restriction   │    none                               │
-       *      └───────────────────────┴───────────────────────────────────────┘"
-       */
-      if (offsets[i] & (ATOMIC_COUNTER_SIZE - 1)) {
-         _mesa_error(ctx, GL_INVALID_VALUE,
-                     "glBindBuffersRange(offsets[%u]=%" PRId64
-                     " is misaligned; it must be a multiple of %d when "
-                     "target=GL_ATOMIC_COUNTER_BUFFER)",
-                     i, (int64_t) offsets[i], ATOMIC_COUNTER_SIZE);
-         continue;
-      }
+         /* The ARB_multi_bind spec says:
+          *
+          *     "An INVALID_VALUE error is generated by BindBuffersRange if any
+          *      pair of values in <offsets> and <sizes> does not respectively
+          *      satisfy the constraints described for those parameters for the
+          *      specified target, as described in section 6.7.1 (per binding)."
+          *
+          * Section 6.7.1 refers to table 6.5, which says:
+          *
+          *     "┌───────────────────────────────────────────────────────────────┐
+          *      │ Atomic counter array bindings (see sec. 7.7.2)                │
+          *      ├───────────────────────┬───────────────────────────────────────┤
+          *      │    ...                │    ...                                │
+          *      │    offset restriction │    multiple of 4                      │
+          *      │    ...                │    ...                                │
+          *      │    size restriction   │    none                               │
+          *      └───────────────────────┴───────────────────────────────────────┘"
+          */
+         if (offsets[i] & (ATOMIC_COUNTER_SIZE - 1)) {
+            _mesa_error(ctx, GL_INVALID_VALUE,
+                        "glBindBuffersRange(offsets[%u]=%" PRId64
+                        " is misaligned; it must be a multiple of %d when "
+                        "target=GL_ATOMIC_COUNTER_BUFFER)",
+                        i, (int64_t) offsets[i], ATOMIC_COUNTER_SIZE);
+            continue;
+         }
 
-      if (binding->BufferObject && binding->BufferObject->Name == buffers[i])
-         bufObj = binding->BufferObject;
-      else
-         bufObj = _mesa_multi_bind_lookup_bufferobj(ctx, buffers, i,
-                                                    "glBindBuffersRange");
+         offset = offsets[i];
+         size = sizes[i];
+      }
 
-      if (bufObj)
-         set_atomic_buffer_binding(ctx, binding, bufObj, offsets[i], sizes[i]);
+      set_buffer_multi_binding(ctx, buffers, i, caller,
+                               binding, offset, size, range,
+                               USAGE_ATOMIC_COUNTER_BUFFER);
    }
 
-   _mesa_end_bufferobj_lookups(ctx);
+   _mesa_HashUnlockMutex(ctx->Shared->BufferObjects);
 }
 
-void GLAPIENTRY
-_mesa_BindBufferRange(GLenum target, GLuint index,
-                      GLuint buffer, GLintptr offset, GLsizeiptr size)
+static ALWAYS_INLINE void
+bind_buffer_range(GLenum target, GLuint index, GLuint buffer, GLintptr offset,
+                  GLsizeiptr size, bool no_error)
 {
    GET_CURRENT_CONTEXT(ctx);
    struct gl_buffer_object *bufObj;
 
+   if (MESA_VERBOSE & VERBOSE_API) {
+      _mesa_debug(ctx, "glBindBufferRange(%s, %u, %u, %lu, %lu)\n",
+                  _mesa_enum_to_string(target), index, buffer,
+                  (unsigned long) offset, (unsigned long) size);
+   }
+
    if (buffer == 0) {
-      bufObj = ctx->Shared->NullBufferObj;
+      bufObj = NULL;
    } else {
       bufObj = _mesa_lookup_bufferobj(ctx, buffer);
-   }
-   if (!_mesa_handle_bind_buffer_gen(ctx, target, buffer,
-                                     &bufObj, "glBindBufferRange"))
-      return;
+      if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
+                                        &bufObj, "glBindBufferRange"))
+         return;
 
-   if (!bufObj) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glBindBufferRange(invalid buffer=%u)", buffer);
-      return;
+      if (!no_error && !bufObj) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "glBindBufferRange(invalid buffer=%u)", buffer);
+         return;
+      }
    }
 
-   if (buffer != 0) {
-      if (size <= 0) {
-         _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(size=%d)",
-                     (int) size);
+   if (no_error) {
+      switch (target) {
+      case GL_TRANSFORM_FEEDBACK_BUFFER:
+         _mesa_bind_buffer_range_xfb(ctx, ctx->TransformFeedback.CurrentObject,
+                                     index, bufObj, offset, size);
+         return;
+      case GL_UNIFORM_BUFFER:
+         bind_buffer_range_uniform_buffer(ctx, index, bufObj, offset, size);
          return;
+      case GL_SHADER_STORAGE_BUFFER:
+         bind_buffer_range_shader_storage_buffer(ctx, index, bufObj, offset,
+                                                 size);
+         return;
+      case GL_ATOMIC_COUNTER_BUFFER:
+         bind_buffer_range_atomic_buffer(ctx, index, bufObj, offset, size);
+         return;
+      default:
+         unreachable("invalid BindBufferRange target with KHR_no_error");
+      }
+   } else {
+      if (buffer != 0) {
+         if (size <= 0) {
+            _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(size=%d)",
+                        (int) size);
+            return;
+         }
       }
-   }
 
-   switch (target) {
-   case GL_TRANSFORM_FEEDBACK_BUFFER:
-      _mesa_bind_buffer_range_transform_feedback(ctx, index, bufObj,
-                                                offset, size);
-      return;
-   case GL_UNIFORM_BUFFER:
-      bind_buffer_range_uniform_buffer(ctx, index, bufObj, offset, size);
-      return;
-   case GL_ATOMIC_COUNTER_BUFFER:
-      bind_atomic_buffer(ctx, index, bufObj, offset, size,
-                         "glBindBufferRange");
-      return;
-   default:
-      _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferRange(target)");
-      return;
+      switch (target) {
+      case GL_TRANSFORM_FEEDBACK_BUFFER:
+         if (!_mesa_validate_buffer_range_xfb(ctx,
+                                              ctx->TransformFeedback.CurrentObject,
+                                              index, bufObj, offset, size,
+                                              false))
+            return;
+
+         _mesa_bind_buffer_range_xfb(ctx, ctx->TransformFeedback.CurrentObject,
+                                     index, bufObj, offset, size);
+         return;
+      case GL_UNIFORM_BUFFER:
+         bind_buffer_range_uniform_buffer_err(ctx, index, bufObj, offset,
+                                              size);
+         return;
+      case GL_SHADER_STORAGE_BUFFER:
+         bind_buffer_range_shader_storage_buffer_err(ctx, index, bufObj,
+                                                     offset, size);
+         return;
+      case GL_ATOMIC_COUNTER_BUFFER:
+         bind_buffer_range_atomic_buffer_err(ctx, index, bufObj,
+                                             offset, size);
+         return;
+      default:
+         _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferRange(target)");
+         return;
+      }
    }
 }
 
+void GLAPIENTRY
+_mesa_BindBufferRange_no_error(GLenum target, GLuint index, GLuint buffer,
+                               GLintptr offset, GLsizeiptr size)
+{
+   bind_buffer_range(target, index, buffer, offset, size, true);
+}
+
+void GLAPIENTRY
+_mesa_BindBufferRange(GLenum target, GLuint index,
+                      GLuint buffer, GLintptr offset, GLsizeiptr size)
+{
+   bind_buffer_range(target, index, buffer, offset, size, false);
+}
+
 void GLAPIENTRY
 _mesa_BindBufferBase(GLenum target, GLuint index, GLuint buffer)
 {
    GET_CURRENT_CONTEXT(ctx);
    struct gl_buffer_object *bufObj;
 
+   if (MESA_VERBOSE & VERBOSE_API) {
+      _mesa_debug(ctx, "glBindBufferBase(%s, %u, %u)\n",
+                  _mesa_enum_to_string(target), index, buffer);
+   }
+
    if (buffer == 0) {
-      bufObj = ctx->Shared->NullBufferObj;
+      bufObj = NULL;
    } else {
       bufObj = _mesa_lookup_bufferobj(ctx, buffer);
-   }
-   if (!_mesa_handle_bind_buffer_gen(ctx, target, buffer,
-                                     &bufObj, "glBindBufferBase"))
-      return;
+      if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
+                                        &bufObj, "glBindBufferBase"))
+         return;
 
-   if (!bufObj) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glBindBufferBase(invalid buffer=%u)", buffer);
-      return;
+      if (!bufObj) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "glBindBufferBase(invalid buffer=%u)", buffer);
+         return;
+      }
    }
 
    /* Note that there's some oddness in the GL 3.1-GL 3.3 specifications with
@@ -3842,14 +4640,18 @@ _mesa_BindBufferBase(GLenum target, GLuint index, GLuint buffer)
 
    switch (target) {
    case GL_TRANSFORM_FEEDBACK_BUFFER:
-      _mesa_bind_buffer_base_transform_feedback(ctx, index, bufObj);
+      _mesa_bind_buffer_base_transform_feedback(ctx,
+                                                ctx->TransformFeedback.CurrentObject,
+                                                index, bufObj, false);
       return;
    case GL_UNIFORM_BUFFER:
       bind_buffer_base_uniform_buffer(ctx, index, bufObj);
       return;
+   case GL_SHADER_STORAGE_BUFFER:
+      bind_buffer_base_shader_storage_buffer(ctx, index, bufObj);
+      return;
    case GL_ATOMIC_COUNTER_BUFFER:
-      bind_atomic_buffer(ctx, index, bufObj, 0, 0,
-                         "glBindBufferBase");
+      bind_buffer_base_atomic_buffer(ctx, index, bufObj);
       return;
    default:
       _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferBase(target)");
@@ -3864,20 +4666,32 @@ _mesa_BindBuffersRange(GLenum target, GLuint first, GLsizei count,
 {
    GET_CURRENT_CONTEXT(ctx);
 
+   if (MESA_VERBOSE & VERBOSE_API) {
+      _mesa_debug(ctx, "glBindBuffersRange(%s, %u, %d, %p, %p, %p)\n",
+                  _mesa_enum_to_string(target), first, count,
+                  buffers, offsets, sizes);
+   }
+
    switch (target) {
    case GL_TRANSFORM_FEEDBACK_BUFFER:
-      bind_xfb_buffers_range(ctx, first, count, buffers, offsets, sizes);
+      bind_xfb_buffers(ctx, first, count, buffers, true, offsets, sizes,
+                       "glBindBuffersRange");
       return;
    case GL_UNIFORM_BUFFER:
-      bind_uniform_buffers_range(ctx, first, count, buffers, offsets, sizes);
+      bind_uniform_buffers(ctx, first, count, buffers, true, offsets, sizes,
+                           "glBindBuffersRange");
+      return;
+   case GL_SHADER_STORAGE_BUFFER:
+      bind_shader_storage_buffers(ctx, first, count, buffers, true, offsets, sizes,
+                                  "glBindBuffersRange");
       return;
    case GL_ATOMIC_COUNTER_BUFFER:
-      bind_atomic_buffers_range(ctx, first, count, buffers,
-                                offsets, sizes);
+      bind_atomic_buffers(ctx, first, count, buffers, true, offsets, sizes,
+                          "glBindBuffersRange");
       return;
    default:
       _mesa_error(ctx, GL_INVALID_ENUM, "glBindBuffersRange(target=%s)",
-                  _mesa_lookup_enum_by_nr(target));
+                  _mesa_enum_to_string(target));
       break;
    }
 }
@@ -3888,23 +4702,54 @@ _mesa_BindBuffersBase(GLenum target, GLuint first, GLsizei count,
 {
    GET_CURRENT_CONTEXT(ctx);
 
+   if (MESA_VERBOSE & VERBOSE_API) {
+      _mesa_debug(ctx, "glBindBuffersBase(%s, %u, %d, %p)\n",
+                  _mesa_enum_to_string(target), first, count, buffers);
+   }
+
    switch (target) {
    case GL_TRANSFORM_FEEDBACK_BUFFER:
-      bind_xfb_buffers_base(ctx, first, count, buffers);
+      bind_xfb_buffers(ctx, first, count, buffers, false, NULL, NULL,
+                       "glBindBuffersBase");
       return;
    case GL_UNIFORM_BUFFER:
-      bind_uniform_buffers_base(ctx, first, count, buffers);
+      bind_uniform_buffers(ctx, first, count, buffers, false, NULL, NULL,
+                           "glBindBuffersBase");
+      return;
+   case GL_SHADER_STORAGE_BUFFER:
+      bind_shader_storage_buffers(ctx, first, count, buffers, false, NULL, NULL,
+                                  "glBindBuffersBase");
       return;
    case GL_ATOMIC_COUNTER_BUFFER:
-      bind_atomic_buffers_base(ctx, first, count, buffers);
+      bind_atomic_buffers(ctx, first, count, buffers, false, NULL, NULL,
+                          "glBindBuffersBase");
       return;
    default:
       _mesa_error(ctx, GL_INVALID_ENUM, "glBindBuffersBase(target=%s)",
-                  _mesa_lookup_enum_by_nr(target));
+                  _mesa_enum_to_string(target));
       break;
    }
 }
 
+static ALWAYS_INLINE void
+invalidate_buffer_subdata(struct gl_context *ctx,
+                          struct gl_buffer_object *bufObj, GLintptr offset,
+                          GLsizeiptr length)
+{
+   if (ctx->Driver.InvalidateBufferSubData)
+      ctx->Driver.InvalidateBufferSubData(ctx, bufObj, offset, length);
+}
+
+void GLAPIENTRY
+_mesa_InvalidateBufferSubData_no_error(GLuint buffer, GLintptr offset,
+                                       GLsizeiptr length)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   invalidate_buffer_subdata(ctx, bufObj, offset, length);
+}
+
 void GLAPIENTRY
 _mesa_InvalidateBufferSubData(GLuint buffer, GLintptr offset,
                               GLsizeiptr length)
@@ -3913,10 +4758,16 @@ _mesa_InvalidateBufferSubData(GLuint buffer, GLintptr offset,
    struct gl_buffer_object *bufObj;
    const GLintptr end = offset + length;
 
+   /* Section 6.5 (Invalidating Buffer Data) of the OpenGL 4.5 (Compatibility
+    * Profile) spec says:
+    *
+    *     "An INVALID_VALUE error is generated if buffer is zero or is not the
+    *     name of an existing buffer object."
+    */
    bufObj = _mesa_lookup_bufferobj(ctx, buffer);
-   if (!bufObj) {
+   if (!bufObj || bufObj == &DummyBufferObject) {
       _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glInvalidateBufferSubData(name = 0x%x) invalid object",
+                  "glInvalidateBufferSubData(name = %u) invalid object",
                   buffer);
       return;
    }
@@ -3927,7 +4778,7 @@ _mesa_InvalidateBufferSubData(GLuint buffer, GLintptr offset,
     *     negative, or if <offset> + <length> is greater than the value of
     *     BUFFER_SIZE."
     */
-   if (end < 0 || end > bufObj->Size) {
+   if (offset < 0 || length < 0 || end > bufObj->Size) {
       _mesa_error(ctx, GL_INVALID_VALUE,
                   "glInvalidateBufferSubData(invalid offset or length)");
       return;
@@ -3948,10 +4799,16 @@ _mesa_InvalidateBufferSubData(GLuint buffer, GLintptr offset,
       return;
    }
 
-   /* We don't actually do anything for this yet.  Just return after
-    * validating the parameters and generating the required errors.
-    */
-   return;
+   invalidate_buffer_subdata(ctx, bufObj, offset, length);
+}
+
+void GLAPIENTRY
+_mesa_InvalidateBufferData_no_error(GLuint buffer)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   struct gl_buffer_object *bufObj =_mesa_lookup_bufferobj(ctx, buffer);
+   invalidate_buffer_subdata(ctx, bufObj, 0, bufObj->Size);
 }
 
 void GLAPIENTRY
@@ -3960,10 +4817,16 @@ _mesa_InvalidateBufferData(GLuint buffer)
    GET_CURRENT_CONTEXT(ctx);
    struct gl_buffer_object *bufObj;
 
+   /* Section 6.5 (Invalidating Buffer Data) of the OpenGL 4.5 (Compatibility
+    * Profile) spec says:
+    *
+    *     "An INVALID_VALUE error is generated if buffer is zero or is not the
+    *     name of an existing buffer object."
+    */
    bufObj = _mesa_lookup_bufferobj(ctx, buffer);
-   if (!bufObj) {
+   if (!bufObj || bufObj == &DummyBufferObject) {
       _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glInvalidateBufferData(name = 0x%x) invalid object",
+                  "glInvalidateBufferData(name = %u) invalid object",
                   buffer);
       return;
    }
@@ -3982,8 +4845,111 @@ _mesa_InvalidateBufferData(GLuint buffer)
       return;
    }
 
-   /* We don't actually do anything for this yet.  Just return after
-    * validating the parameters and generating the required errors.
+   invalidate_buffer_subdata(ctx, bufObj, 0, bufObj->Size);
+}
+
+static void
+buffer_page_commitment(struct gl_context *ctx,
+                       struct gl_buffer_object *bufferObj,
+                       GLintptr offset, GLsizeiptr size,
+                       GLboolean commit, const char *func)
+{
+   if (!(bufferObj->StorageFlags & GL_SPARSE_STORAGE_BIT_ARB)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "%s(not a sparse buffer object)",
+                  func);
+      return;
+   }
+
+   if (size < 0 || size > bufferObj->Size ||
+       offset < 0 || offset > bufferObj->Size - size) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "%s(out of bounds)",
+                  func);
+      return;
+   }
+
+   /* The GL_ARB_sparse_buffer extension specification says:
+    *
+    *     "INVALID_VALUE is generated by BufferPageCommitmentARB if <offset> is
+    *     not an integer multiple of SPARSE_BUFFER_PAGE_SIZE_ARB, or if <size>
+    *     is not an integer multiple of SPARSE_BUFFER_PAGE_SIZE_ARB and does
+    *     not extend to the end of the buffer's data store."
     */
-   return;
+   if (offset % ctx->Const.SparseBufferPageSize != 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "%s(offset not aligned to page size)",
+                  func);
+      return;
+   }
+
+   if (size % ctx->Const.SparseBufferPageSize != 0 &&
+       offset + size != bufferObj->Size) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "%s(size not aligned to page size)",
+                  func);
+      return;
+   }
+
+   ctx->Driver.BufferPageCommitment(ctx, bufferObj, offset, size, commit);
+}
+
+void GLAPIENTRY
+_mesa_BufferPageCommitmentARB(GLenum target, GLintptr offset, GLsizeiptr size,
+                              GLboolean commit)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufferObj;
+
+   bufferObj = get_buffer(ctx, "glBufferPageCommitmentARB", target,
+                          GL_INVALID_ENUM);
+   if (!bufferObj)
+      return;
+
+   buffer_page_commitment(ctx, bufferObj, offset, size, commit,
+                          "glBufferPageCommitmentARB");
+}
+
+void GLAPIENTRY
+_mesa_NamedBufferPageCommitmentARB(GLuint buffer, GLintptr offset,
+                                   GLsizeiptr size, GLboolean commit)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufferObj;
+
+   bufferObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (!bufferObj || bufferObj == &DummyBufferObject) {
+      /* Note: the extension spec is not clear about the excpected error value. */
+      _mesa_error(ctx, GL_INVALID_VALUE,
+                  "glNamedBufferPageCommitmentARB(name = %u) invalid object",
+                  buffer);
+      return;
+   }
+
+   buffer_page_commitment(ctx, bufferObj, offset, size, commit,
+                          "glNamedBufferPageCommitmentARB");
+}
+
+void GLAPIENTRY
+_mesa_NamedBufferPageCommitmentEXT(GLuint buffer, GLintptr offset,
+                                   GLsizeiptr size, GLboolean commit)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufferObj;
+
+   /* Use NamedBuffer* functions logic from EXT_direct_state_access */
+   if (buffer != 0) {
+      bufferObj = _mesa_lookup_bufferobj(ctx, buffer);
+      if (!_mesa_handle_bind_buffer_gen(ctx, buffer, &bufferObj,
+                                        "glNamedBufferPageCommitmentEXT"))
+         return;
+   } else {
+      /* GL_EXT_direct_state_access says about NamedBuffer* functions:
+       *
+       *   There is no buffer corresponding to the name zero, these commands
+       *   generate the INVALID_OPERATION error if the buffer parameter is
+       *   zero.
+       */
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glNamedBufferPageCommitmentEXT(buffer = 0)");
+      return;
+   }
+   buffer_page_commitment(ctx, bufferObj, offset, size, commit,
+                          "glNamedBufferPageCommitmentEXT");
 }