mesa: rename gl_vertex_array_object::VertexBinding to BufferBinding
[mesa.git] / src / mesa / main / bufferobj.c
index 0e77f73cf1888c45f93d6855f18c7cde4f74a513..865b526eb8fb1918657fc6748840987c976a2754 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 "context.h"
 #include "bufferobj.h"
-#include "fbobject.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"
 
 
 /* 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_vdebug(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.
@@ -90,20 +122,35 @@ 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 ((ctx->API == API_OPENGL_CORE &&
+           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 +159,11 @@ 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;
@@ -244,7 +296,7 @@ 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)
 {
@@ -385,7 +437,7 @@ 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 *
@@ -403,15 +455,16 @@ _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 */
@@ -443,23 +496,10 @@ _mesa_reference_buffer_object_(struct gl_context *ctx,
       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
-
         assert(ctx->Driver.DeleteBuffer);
          ctx->Driver.DeleteBuffer(ctx, oldObj);
       }
@@ -479,10 +519,6 @@ _mesa_reference_buffer_object_(struct gl_context *ctx,
       }
       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);
@@ -490,6 +526,24 @@ _mesa_reference_buffer_object_(struct gl_context *ctx,
 }
 
 
+/**
+ * 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;
+}
+
+
 /**
  * Initialize a buffer object to default values.
  */
@@ -503,6 +557,9 @@ _mesa_initialize_buffer_object(struct gl_context *ctx,
    obj->RefCount = 1;
    obj->Name = name;
    obj->Usage = GL_STATIC_DRAW_ARB;
+
+   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;
 }
 
@@ -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 */
@@ -831,12 +890,24 @@ _mesa_init_buffer_objects( struct gl_context *ctx )
    _mesa_reference_buffer_object(ctx, &ctx->UniformBuffer,
                                 ctx->Shared->NullBufferObj);
 
+   _mesa_reference_buffer_object(ctx, &ctx->ShaderStorageBuffer,
+                                 ctx->Shared->NullBufferObj);
+
    _mesa_reference_buffer_object(ctx, &ctx->AtomicBuffer,
                                 ctx->Shared->NullBufferObj);
 
    _mesa_reference_buffer_object(ctx, &ctx->DrawIndirectBuffer,
                                 ctx->Shared->NullBufferObj);
 
+   _mesa_reference_buffer_object(ctx, &ctx->ParameterBuffer,
+                                ctx->Shared->NullBufferObj);
+
+   _mesa_reference_buffer_object(ctx, &ctx->DispatchIndirectBuffer,
+                                ctx->Shared->NullBufferObj);
+
+   _mesa_reference_buffer_object(ctx, &ctx->QueryBuffer,
+                                 ctx->Shared->NullBufferObj);
+
    for (i = 0; i < MAX_COMBINED_UNIFORM_BUFFERS; i++) {
       _mesa_reference_buffer_object(ctx,
                                    &ctx->UniformBufferBindings[i].BufferObject,
@@ -845,12 +916,20 @@ _mesa_init_buffer_objects( struct gl_context *ctx )
       ctx->UniformBufferBindings[i].Size = -1;
    }
 
+   for (i = 0; i < MAX_COMBINED_SHADER_STORAGE_BUFFERS; i++) {
+      _mesa_reference_buffer_object(ctx,
+                                    &ctx->ShaderStorageBufferBindings[i].BufferObject,
+                                    ctx->Shared->NullBufferObj);
+      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;
+      ctx->AtomicBufferBindings[i].Offset = 0;
+      ctx->AtomicBufferBindings[i].Size = 0;
    }
 }
 
@@ -867,16 +946,30 @@ _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 +980,13 @@ _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;
    }
@@ -929,7 +1021,8 @@ bind_buffer_object(struct gl_context *ctx, GLenum target, GLuint buffer)
 
    bindTarget = get_buffer_target(ctx, target);
    if (!bindTarget) {
-      _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferARB(target 0x%x)", target);
+      _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferARB(target %s)",
+                  _mesa_enum_to_string(target));
       return;
    }
 
@@ -950,11 +1043,20 @@ bind_buffer_object(struct gl_context *ctx, GLenum target, GLuint buffer)
    else {
       /* 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 */
+   switch (target) {
+   case GL_PIXEL_PACK_BUFFER:
+      newBufObj->UsageHistory |= USAGE_PIXEL_PACK_BUFFER;
+      break;
+   default:
+      break;
+   }
+
    /* bind new buffer */
    _mesa_reference_buffer_object(ctx, bindTarget, newBufObj);
 }
@@ -962,7 +1064,7 @@ 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
@@ -997,14 +1099,17 @@ _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,
@@ -1013,9 +1118,11 @@ _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;
 }
@@ -1093,11 +1200,13 @@ _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, ctx->Shared->NullBufferObj,
+                               vao->BufferBinding[index].Offset,
+                               vao->BufferBinding[index].Stride);
    }
 }
 
@@ -1115,14 +1224,14 @@ _mesa_init_buffer_object_functions(struct dd_function_table *driver)
    driver->BufferData = buffer_data_fallback;
    driver->BufferSubData = buffer_sub_data_fallback;
    driver->GetBufferSubData = _mesa_buffer_get_subdata;
-   driver->UnmapBuffer = _mesa_buffer_unmap;
+   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;
@@ -1154,9 +1263,10 @@ _mesa_BindBuffer(GLenum target, GLuint buffer)
 {
    GET_CURRENT_CONTEXT(ctx);
 
-   if (MESA_VERBOSE & VERBOSE_API)
+   if (MESA_VERBOSE & VERBOSE_API) {
       _mesa_debug(ctx, "glBindBuffer(%s, %u)\n",
-                  _mesa_lookup_enum_by_nr(target), buffer);
+                  _mesa_enum_to_string(target), buffer);
+   }
 
    bind_buffer_object(ctx, target, buffer);
 }
@@ -1164,7 +1274,7 @@ _mesa_BindBuffer(GLenum target, GLuint buffer)
 
 /**
  * Delete a set of buffer objects.
- * 
+ *
  * \param n      Number of buffer objects to delete.
  * \param ids    Array of \c n buffer object IDs.
  */
@@ -1180,10 +1290,11 @@ _mesa_DeleteBuffers(GLsizei n, const GLuint *ids)
       return;
    }
 
-   mtx_lock(&ctx->Shared->Mutex);
+   _mesa_HashLockMutex(ctx->Shared->BufferObjects);
 
    for (i = 0; i < n; i++) {
-      struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, ids[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;
@@ -1193,8 +1304,8 @@ _mesa_DeleteBuffers(GLsizei n, const GLuint *ids)
          _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);
+         for (j = 0; j < ARRAY_SIZE(vao->BufferBinding); j++) {
+            unbind(ctx, vao, j, bufObj);
          }
 
          if (ctx->Array.ArrayBufferObj == bufObj) {
@@ -1209,6 +1320,16 @@ _mesa_DeleteBuffers(GLsizei n, const GLuint *ids)
             _mesa_BindBuffer( GL_DRAW_INDIRECT_BUFFER, 0 );
          }
 
+         /* unbind ARB_indirect_parameters binding point */
+         if (ctx->ParameterBuffer == bufObj) {
+            _mesa_BindBuffer(GL_PARAMETER_BUFFER_ARB, 0);
+         }
+
+         /* unbind ARB_compute_shader binding point */
+         if (ctx->DispatchIndirectBuffer == bufObj) {
+            _mesa_BindBuffer(GL_DISPATCH_INDIRECT_BUFFER, 0);
+         }
+
          /* unbind ARB_copy_buffer binding points */
          if (ctx->CopyReadBuffer == bufObj) {
             _mesa_BindBuffer( GL_COPY_READ_BUFFER, 0 );
@@ -1238,6 +1359,17 @@ _mesa_DeleteBuffers(GLsizei n, const GLuint *ids)
             _mesa_BindBuffer( GL_UNIFORM_BUFFER, 0 );
          }
 
+         /* unbind SSBO binding points */
+         for (j = 0; j < ctx->Const.MaxShaderStorageBufferBindings; j++) {
+            if (ctx->ShaderStorageBufferBindings[j].BufferObject == bufObj) {
+               _mesa_BindBufferBase(GL_SHADER_STORAGE_BUFFER, j, 0);
+            }
+         }
+
+         if (ctx->ShaderStorageBuffer == bufObj) {
+            _mesa_BindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
+         }
+
          /* unbind Atomci Buffer binding points */
          for (j = 0; j < ctx->Const.MaxAtomicBufferBindings; j++) {
             if (ctx->AtomicBufferBindings[j].BufferObject == bufObj) {
@@ -1265,8 +1397,13 @@ _mesa_DeleteBuffers(GLsizei n, const GLuint *ids)
             _mesa_BindBuffer(GL_EXTERNAL_VIRTUAL_MEMORY_BUFFER_AMD, 0);
          }
 
+         /* unbind query buffer binding point */
+         if (ctx->QueryBuffer == bufObj) {
+            _mesa_BindBuffer(GL_QUERY_BUFFER, 0);
+         }
+
          /* The ID is immediately freed for re-use */
-         _mesa_HashRemove(ctx->Shared->BufferObjects, ids[i]);
+         _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().
@@ -1282,7 +1419,7 @@ _mesa_DeleteBuffers(GLsizei n, const GLuint *ids)
       }
    }
 
-   mtx_unlock(&ctx->Shared->Mutex);
+   _mesa_HashUnlockMutex(ctx->Shared->BufferObjects);
 }
 
 
@@ -1316,7 +1453,7 @@ create_buffers(GLsizei n, GLuint *buffers, bool dsa)
    /*
     * 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);
 
@@ -1331,16 +1468,17 @@ create_buffers(GLsizei n, GLuint *buffers, bool dsa)
          buf = ctx->Driver.NewBufferObject(ctx, buffers[i]);
          if (!buf) {
             _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func);
+            _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);
    }
 
-   mtx_unlock(&ctx->Shared->Mutex);
+   _mesa_HashUnlockMutex(ctx->Shared->BufferObjects);
 }
 
 /**
@@ -1370,9 +1508,9 @@ _mesa_CreateBuffers(GLsizei n, GLuint *buffers)
 
 /**
  * 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
@@ -1382,9 +1520,7 @@ _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;
 }
@@ -1435,6 +1571,7 @@ _mesa_buffer_storage(struct gl_context *ctx, struct gl_buffer_object *bufObj,
 
    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,
@@ -1494,12 +1631,13 @@ _mesa_buffer_data(struct gl_context *ctx, struct gl_buffer_object *bufObj,
 {
    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));
+                  _mesa_enum_to_string(usage));
+   }
 
    if (size < 0) {
       _mesa_error(ctx, GL_INVALID_VALUE, "%s(size < 0)", func);
@@ -1532,7 +1670,7 @@ _mesa_buffer_data(struct gl_context *ctx, struct gl_buffer_object *bufObj,
 
    if (!valid_usage) {
       _mesa_error(ctx, GL_INVALID_ENUM, "%s(invalid usage: %s)", func,
-                  _mesa_lookup_enum_by_nr(usage));
+                  _mesa_enum_to_string(usage));
       return;
    }
 
@@ -1547,6 +1685,7 @@ _mesa_buffer_data(struct gl_context *ctx, struct gl_buffer_object *bufObj,
    FLUSH_VERTICES(ctx, _NEW_BUFFER_OBJECT);
 
    bufObj->Written = GL_TRUE;
+   bufObj->MinMaxCacheDirty = true;
 
 #ifdef VBO_DEBUG
    printf("glBufferDataARB(%u, sz %ld, from %p, usage 0x%x)\n",
@@ -1629,21 +1768,37 @@ _mesa_buffer_sub_data(struct gl_context *ctx, struct gl_buffer_object *bufObj,
                       const char *func)
 {
    if (!buffer_object_subdata_range_good(ctx, bufObj, offset, size,
-                                         false, func)) {
+                                         true, func)) {
       /* error already recorded */
       return;
    }
 
    if (bufObj->Immutable &&
        !(bufObj->StorageFlags & GL_DYNAMIC_STORAGE_BIT)) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, func);
+      _mesa_error(ctx, GL_INVALID_OPERATION, "%s", func);
       return;
    }
 
    if (size == 0)
       return;
 
+   bufObj->NumSubDataCalls++;
+
+   if ((bufObj->Usage == GL_STATIC_DRAW ||
+        bufObj->Usage == GL_STATIC_COPY) &&
+       bufObj->NumSubDataCalls >= BUFFER_WARNING_CALL_COUNT) {
+      /* 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));
+   }
+
    bufObj->Written = GL_TRUE;
+   bufObj->MinMaxCacheDirty = true;
 
    assert(ctx->Driver.BufferSubData);
    ctx->Driver.BufferSubData(ctx, offset, size, data, bufObj);
@@ -1697,9 +1852,31 @@ _mesa_GetBufferSubData(GLenum target, GLintptr offset,
    }
 
    assert(ctx->Driver.GetBufferSubData);
-   ctx->Driver.GetBufferSubData( ctx, offset, size, data, bufObj );
+   ctx->Driver.GetBufferSubData(ctx, offset, size, data, bufObj);
+}
+
+void GLAPIENTRY
+_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,
+                                       "glGetNamedBufferSubData");
+   if (!bufObj)
+      return;
+
+   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);
 }
 
+
 /**
  * \param subdata   true if caller is *SubData, false if *Data
  */
@@ -1737,12 +1914,16 @@ _mesa_clear_buffer_sub_data(struct gl_context *ctx,
       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;
    }
 
@@ -1751,10 +1932,8 @@ _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);
 }
 
 void GLAPIENTRY
@@ -1828,130 +2007,16 @@ _mesa_ClearNamedBufferSubData(GLuint buffer, GLenum internalformat,
 }
 
 
-void * GLAPIENTRY
-_mesa_MapBuffer(GLenum target, GLenum access)
-{
-   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;
-
-#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
-
-#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
-
-   return bufObj->Mappings[MAP_USER].Pointer;
-}
-
-
-GLboolean GLAPIENTRY
-_mesa_UnmapBuffer(GLenum target)
+GLboolean
+_mesa_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;
    }
 
@@ -2000,129 +2065,164 @@ _mesa_UnmapBuffer(GLenum target)
    return status;
 }
 
+GLboolean GLAPIENTRY
+_mesa_UnmapBuffer(GLenum target)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
 
-void GLAPIENTRY
-_mesa_GetBufferParameteriv(GLenum target, GLenum pname, GLint *params)
+   bufObj = get_buffer(ctx, "glUnmapBuffer", target, GL_INVALID_OPERATION);
+   if (!bufObj)
+      return GL_FALSE;
+
+   return _mesa_unmap_buffer(ctx, bufObj, "glUnmapBuffer");
+}
+
+GLboolean GLAPIENTRY
+_mesa_UnmapNamedBuffer(GLuint buffer)
 {
    GET_CURRENT_CONTEXT(ctx);
    struct gl_buffer_object *bufObj;
 
-   bufObj = get_buffer(ctx, "glGetBufferParameterivARB", target,
-                       GL_INVALID_OPERATION);
+   bufObj = _mesa_lookup_bufferobj_err(ctx, buffer, "glUnmapNamedBuffer");
    if (!bufObj)
-      return;
+      return GL_FALSE;
 
+   return _mesa_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;
-      return;
-   case GL_BUFFER_MAP_LENGTH:
-      if (!ctx->Extensions.ARB_map_buffer_range)
-         goto invalid_pname;
-      *params = bufObj->Mappings[MAP_USER].Length;
-      return;
-   case GL_BUFFER_IMMUTABLE_STORAGE:
-      if (!ctx->Extensions.ARB_buffer_storage)
-         goto invalid_pname;
-      *params = bufObj->Immutable;
+   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_STORAGE_FLAGS:
-      if (!ctx->Extensions.ARB_buffer_storage)
-         goto invalid_pname;
-      *params = bufObj->StorageFlags;
+
+   if (!get_buffer_parameter(ctx, bufObj, pname, &parameter,
+                             "glGetNamedBufferParameteriv"))
+      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 +2230,15 @@ 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;
@@ -2145,6 +2246,26 @@ _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;
+
+   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
 _mesa_copy_buffer_sub_data(struct gl_context *ctx,
@@ -2212,6 +2333,8 @@ _mesa_copy_buffer_sub_data(struct gl_context *ctx,
       }
    }
 
+   dst->MinMaxCacheDirty = true;
+
    ctx->Driver.CopyBufferSubData(ctx, src, dst, readOffset, writeOffset, size);
 }
 
@@ -2260,35 +2383,26 @@ _mesa_CopyNamedBufferSubData(GLuint readBuffer, GLuint writeBuffer,
 }
 
 
-/**
- * See GL_ARB_map_buffer_range spec
- */
-void * GLAPIENTRY
-_mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
-                     GLbitfield access)
+void *
+_mesa_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;
-   }
-
    if (offset < 0) {
       _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glMapBufferRange(offset = %ld)", (long)offset);
+                  "%s(offset %ld < 0)", func, (long) offset);
       return NULL;
    }
 
    if (length < 0) {
       _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glMapBufferRange(length = %ld)", (long)length);
+                  "%s(length %ld < 0)", func, (long) length);
       return NULL;
    }
 
@@ -2298,10 +2412,13 @@ _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)");
+   if (length == 0) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "%s(length = 0)", func);
       return NULL;
    }
 
@@ -2318,14 +2435,15 @@ _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)");
+      /* 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 NULL;
    }
 
    if ((access & (GL_MAP_READ_BIT | GL_MAP_WRITE_BIT)) == 0) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(access indicates neither read or write)");
+                  "%s(access indicates neither read or write)", func);
       return NULL;
    }
 
@@ -2334,82 +2452,82 @@ _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)");
+                  "%s(read access with disallowed bits)", func);
       return NULL;
    }
 
    if ((access & GL_MAP_FLUSH_EXPLICIT_BIT) &&
        ((access & GL_MAP_WRITE_BIT) == 0)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(invalid access flags)");
+                  "%s(access has flush explicit without write)", func);
       return NULL;
    }
 
-   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)");
+                  "%s(buffer does not allow read access)", func);
       return NULL;
    }
 
    if (access & GL_MAP_WRITE_BIT &&
        !(bufObj->StorageFlags & GL_MAP_WRITE_BIT)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(invalid write flag)");
+                  "%s(buffer does not allow write access)", func);
       return NULL;
    }
 
    if (access & GL_MAP_COHERENT_BIT &&
        !(bufObj->StorageFlags & GL_MAP_COHERENT_BIT)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(invalid coherent flag)");
+                  "%s(buffer does not allow coherent access)", func);
       return NULL;
    }
 
    if (access & GL_MAP_PERSISTENT_BIT &&
        !(bufObj->StorageFlags & GL_MAP_PERSISTENT_BIT)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(invalid persistent flag)");
+                  "%s(buffer does not allow persistent access)", func);
       return NULL;
    }
 
    if (offset + length > bufObj->Size) {
       _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glMapBufferRange(offset + length > size)");
+                  "%s(offset %lu + length %lu > buffer_size %lu)", func,
+                  (unsigned long) offset, (unsigned long) length,
+                  (unsigned long) bufObj->Size);
       return NULL;
    }
 
    if (_mesa_bufferobj_mapped(bufObj, MAP_USER)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glMapBufferRange(buffer already mapped)");
+                  "%s(buffer already mapped)", func);
       return NULL;
    }
 
    if (!bufObj->Size) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY,
-                  "glMapBufferRange(buffer size = 0)");
+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s(buffer size = 0)", func);
       return NULL;
    }
 
-   /* 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;
+   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));
+      }
    }
 
    assert(ctx->Driver.MapBufferRange);
    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.
@@ -2422,446 +2540,234 @@ _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;
 }
 
-
-static GLenum
-buffer_object_purgeable(struct gl_context *ctx, GLuint name, GLenum option)
+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;
-
-   retval = GL_VOLATILE_APPLE;
-   if (ctx->Driver.BufferObjectPurgeable)
-      retval = ctx->Driver.BufferObjectPurgeable(ctx, bufObj, option);
+   bufObj = get_buffer(ctx, "glMapBufferRange", target, GL_INVALID_OPERATION);
+   if (!bufObj)
+      return NULL;
 
-   return retval;
+   return _mesa_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(GLuint buffer, GLintptr offset, GLsizeiptr length,
+                          GLbitfield 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;
-   }
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
 
-   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;
+                  "glMapNamedBufferRange("
+                  "ARB_map_buffer_range not supported)");
+      return NULL;
    }
 
-   bufObj->Purgeable = GL_TRUE;
-
-   retval = GL_VOLATILE_APPLE;
-   if (ctx->Driver.RenderObjectPurgeable)
-      retval = ctx->Driver.RenderObjectPurgeable(ctx, bufObj, option);
+   bufObj = _mesa_lookup_bufferobj_err(ctx, buffer, "glMapNamedBufferRange");
+   if (!bufObj)
+      return NULL;
 
-   return retval;
+   return _mesa_map_buffer_range(ctx, bufObj, offset, length, access,
+                                 "glMapNamedBufferRange");
 }
 
-
-static GLenum
-texture_object_purgeable(struct gl_context *ctx, GLuint name, GLenum option)
+/**
+ * Converts GLenum access from MapBuffer and MapNamedBuffer into
+ * flags for input to _mesa_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)
 {
-   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) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glObjectPurgeable(name = 0x%x) is already purgeable", name);
-      return GL_VOLATILE_APPLE;
+   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:
+      return false;
    }
-
-   bufObj->Purgeable = GL_TRUE;
-
-   retval = GL_VOLATILE_APPLE;
-   if (ctx->Driver.TextureObjectPurgeable)
-      retval = ctx->Driver.TextureObjectPurgeable(ctx, bufObj, option);
-
-   return retval;
 }
 
-
-GLenum GLAPIENTRY
-_mesa_ObjectPurgeableAPPLE(GLenum objectType, GLuint name, GLenum option)
+void * GLAPIENTRY
+_mesa_MapBuffer(GLenum target, GLenum access)
 {
-   GLenum retval;
-
    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;
-   }
+   struct gl_buffer_object *bufObj;
+   GLbitfield accessFlags;
 
-   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;
+   if (!get_map_buffer_access_flags(ctx, access, &accessFlags)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glMapBuffer(invalid access)");
+      return NULL;
    }
 
-   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;
-   }
+   bufObj = get_buffer(ctx, "glMapBuffer", target, GL_INVALID_OPERATION);
+   if (!bufObj)
+      return NULL;
 
-   /* 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 _mesa_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_MapNamedBuffer(GLuint buffer, 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, "glMapNamedBuffer(invalid access)");
+      return NULL;
    }
 
-   bufObj->Purgeable = GL_FALSE;
-
-   retval = option;
-   if (ctx->Driver.BufferObjectUnpurgeable)
-      retval = ctx->Driver.BufferObjectUnpurgeable(ctx, bufObj, option);
+   bufObj = _mesa_lookup_bufferobj_err(ctx, buffer, "glMapNamedBuffer");
+   if (!bufObj)
+      return NULL;
 
-   return retval;
+   return _mesa_map_buffer_range(ctx, bufObj, 0, bufObj->Size, accessFlags,
+                                 "glMapNamedBuffer");
 }
 
 
-static GLenum
-renderbuffer_unpurgeable(struct gl_context *ctx, GLuint name, GLenum option)
+void
+_mesa_flush_mapped_buffer_range(struct gl_context *ctx,
+                                struct gl_buffer_object *bufObj,
+                                GLintptr offset, GLsizeiptr length,
+                                const char *func)
 {
-   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) {
+   if (!ctx->Extensions.ARB_map_buffer_range) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glObjectUnpurgeable(name = 0x%x) object is "
-                  " already \"unpurged\"", name);
-      return 0;
+                  "%s(ARB_map_buffer_range not supported)", func);
+      return;
    }
 
-   bufObj->Purgeable = GL_FALSE;
-
-   retval = option;
-   if (ctx->Driver.RenderObjectUnpurgeable)
-      retval = ctx->Driver.RenderObjectUnpurgeable(ctx, bufObj, option);
-
-   return retval;
-}
-
-
-static GLenum
-texture_object_unpurgeable(struct gl_context *ctx, GLuint name, GLenum option)
-{
-   struct gl_texture_object *bufObj;
-   GLenum retval;
-
-   bufObj = _mesa_lookup_texture(ctx, name);
-   if (!bufObj) {
+   if (offset < 0) {
       _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;
+                  "%s(offset %ld < 0)", func, (long) offset);
+      return;
    }
 
-   bufObj->Purgeable = GL_FALSE;
-
-   retval = option;
-   if (ctx->Driver.TextureObjectUnpurgeable)
-      retval = ctx->Driver.TextureObjectUnpurgeable(ctx, bufObj, option);
-
-   return retval;
-}
-
-
-GLenum GLAPIENTRY
-_mesa_ObjectUnpurgeableAPPLE(GLenum objectType, GLuint name, GLenum option)
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
-
-   if (name == 0) {
+   if (length < 0) {
       _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glObjectUnpurgeable(name = 0x%x)", name);
-      return 0;
-   }
-
-   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;
+                  "%s(length %ld < 0)", func, (long) length);
+      return;
    }
-}
 
-
-static void
-get_buffer_object_parameteriv(struct gl_context *ctx, GLuint name,
-                              GLenum pname, GLint *params)
-{
-   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 (!_mesa_bufferobj_mapped(bufObj, MAP_USER)) {
+      /* buffer is not mapped */
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "%s(buffer is not mapped)", 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 ((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_renderbuffer_parameteriv(struct gl_context *ctx, GLuint name,
-                             GLenum pname, GLint *params)
-{
-   struct gl_renderbuffer *rb = _mesa_lookup_renderbuffer(ctx, name);
-   if (!rb) {
+   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 = rb->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);
+}
 
-static void
-get_texture_object_parameteriv(struct gl_context *ctx, GLuint name,
-                               GLenum pname, GLint *params)
+void GLAPIENTRY
+_mesa_FlushMappedBufferRange(GLenum target, GLintptr offset,
+                             GLsizeiptr length)
 {
-   struct gl_texture_object *texObj = _mesa_lookup_texture(ctx, name);
-   if (!texObj) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glObjectUnpurgeable(name = 0x%x)", name);
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_buffer_object *bufObj;
+
+   bufObj = get_buffer(ctx, "glFlushMappedBufferRange", target,
+                       GL_INVALID_OPERATION);
+   if (!bufObj)
       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;
-   }
+   _mesa_flush_mapped_buffer_range(ctx, bufObj, offset, length,
+                                   "glFlushMappedBufferRange");
 }
 
-
 void GLAPIENTRY
-_mesa_GetObjectParameterivAPPLE(GLenum objectType, GLuint name, GLenum pname,
-                                GLint *params)
+_mesa_FlushMappedNamedBufferRange(GLuint buffer, 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 = _mesa_lookup_bufferobj_err(ctx, buffer,
+                                       "glFlushMappedNamedBufferRange");
+   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);
-   }
+   _mesa_flush_mapped_buffer_range(ctx, bufObj, offset, length,
+                                   "glFlushMappedNamedBufferRange");
 }
 
+
 /**
  * Binds a buffer object to a uniform buffer binding point.
  *
@@ -2889,6 +2795,33 @@ set_ubo_binding(struct gl_context *ctx,
       bufObj->UsageHistory |= USAGE_UNIFORM_BUFFER;
 }
 
+/**
+ * Binds a buffer object to a shader storage buffer binding point.
+ *
+ * The caller is responsible for flushing vertices and updating
+ * NewDriverState.
+ */
+static void
+set_ssbo_binding(struct gl_context *ctx,
+                 struct gl_shader_storage_buffer_binding *binding,
+                 struct gl_buffer_object *bufObj,
+                 GLintptr offset,
+                 GLsizeiptr size,
+                 GLboolean autoSize)
+{
+   _mesa_reference_buffer_object(ctx, &binding->BufferObject, bufObj);
+
+   binding->Offset = offset;
+   binding->Size = size;
+   binding->AutomaticSize = autoSize;
+
+   /* If this is a real buffer object, mark it has having been used
+    * at some point as a SSBO.
+    */
+   if (size >= 0)
+      bufObj->UsageHistory |= USAGE_SHADER_STORAGE_BUFFER;
+}
+
 /**
  * Binds a buffer object to a uniform buffer binding point.
  *
@@ -2904,8 +2837,39 @@ bind_uniform_buffer(struct gl_context *ctx,
                     GLsizeiptr size,
                     GLboolean autoSize)
 {
-   struct gl_uniform_buffer_binding *binding =
-      &ctx->UniformBufferBindings[index];
+   struct gl_uniform_buffer_binding *binding =
+      &ctx->UniformBufferBindings[index];
+
+   if (binding->BufferObject == bufObj &&
+       binding->Offset == offset &&
+       binding->Size == size &&
+       binding->AutomaticSize == autoSize) {
+      return;
+   }
+
+   FLUSH_VERTICES(ctx, 0);
+   ctx->NewDriverState |= ctx->DriverFlags.NewUniformBuffer;
+
+   set_ubo_binding(ctx, binding, bufObj, offset, size, autoSize);
+}
+
+/**
+ * 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)
+{
+   struct gl_shader_storage_buffer_binding *binding =
+      &ctx->ShaderStorageBufferBindings[index];
 
    if (binding->BufferObject == bufObj &&
        binding->Offset == offset &&
@@ -2915,9 +2879,9 @@ bind_uniform_buffer(struct gl_context *ctx,
    }
 
    FLUSH_VERTICES(ctx, 0);
-   ctx->NewDriverState |= ctx->DriverFlags.NewUniformBuffer;
+   ctx->NewDriverState |= ctx->DriverFlags.NewShaderStorageBuffer;
 
-   set_ubo_binding(ctx, binding, bufObj, offset, size, autoSize);
+   set_ssbo_binding(ctx, binding, bufObj, offset, size, autoSize);
 }
 
 /**
@@ -2955,6 +2919,40 @@ bind_buffer_range_uniform_buffer(struct gl_context *ctx,
    bind_uniform_buffer(ctx, index, bufObj, offset, size, GL_FALSE);
 }
 
+/**
+ * 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_range_shader_storage_buffer(struct gl_context *ctx,
+                                        GLuint index,
+                                        struct gl_buffer_object *bufObj,
+                                        GLintptr offset,
+                                        GLsizeiptr size)
+{
+   if (index >= ctx->Const.MaxShaderStorageBufferBindings) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(index=%d)", index);
+      return;
+   }
+
+   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) {
+      offset = -1;
+      size = -1;
+   }
+
+   _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.
@@ -2978,6 +2976,28 @@ bind_buffer_base_uniform_buffer(struct gl_context *ctx,
       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 == ctx->Shared->NullBufferObj)
+      bind_shader_storage_buffer(ctx, index, bufObj, -1, -1, GL_TRUE);
+   else
+      bind_shader_storage_buffer(ctx, index, bufObj, 0, 0, GL_TRUE);
+}
+
 /**
  * Binds a buffer object to an atomic buffer binding point.
  *
@@ -2994,8 +3014,8 @@ set_atomic_buffer_binding(struct gl_context *ctx,
    _mesa_reference_buffer_object(ctx, &binding->BufferObject, bufObj);
 
    if (bufObj == ctx->Shared->NullBufferObj) {
-      binding->Offset = -1;
-      binding->Size = -1;
+      binding->Offset = 0;
+      binding->Size = 0;
    } else {
       binding->Offset = offset;
       binding->Size = size;
@@ -3110,6 +3130,35 @@ 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
@@ -3125,13 +3174,32 @@ unbind_uniform_buffers(struct gl_context *ctx, GLuint first, GLsizei count)
                       bufObj, -1, -1, GL_TRUE);
 }
 
+/**
+ * Unbind all shader storage buffers in the range
+ * <first> through <first>+<count>-1
+ */
+static void
+unbind_shader_storage_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_ssbo_binding(ctx, &ctx->ShaderStorageBufferBindings[first + i],
+                       bufObj, -1, -1, GL_TRUE);
+}
+
 static void
-bind_uniform_buffers_base(struct gl_context *ctx, GLuint first, GLsizei count,
-                          const GLuint *buffers)
+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)
 {
    GLint i;
 
-   if (!error_check_bind_uniform_buffers(ctx, first, count, "glBindBuffersBase"))
+   if (!error_check_bind_uniform_buffers(ctx, first, count, caller))
       return;
 
    /* Assume that at least one binding will be changed */
@@ -3141,8 +3209,11 @@ 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;
@@ -3171,20 +3242,59 @@ bind_uniform_buffers_base(struct gl_context *ctx, GLuint first, GLsizei count,
 
    for (i = 0; i < count; i++) {
       struct gl_uniform_buffer_binding *binding =
-          &ctx->UniformBufferBindings[first + i];
+         &ctx->UniformBufferBindings[first + i];
       struct gl_buffer_object *bufObj;
+      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:
+          *
+          *     "┌───────────────────────────────────────────────────────────────┐
+          *      │ 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,
-                                                    "glBindBuffersBase");
+         bufObj = _mesa_multi_bind_lookup_bufferobj(ctx, buffers, i, caller);
 
       if (bufObj) {
          if (bufObj == ctx->Shared->NullBufferObj)
-            set_ubo_binding(ctx, binding, bufObj, -1, -1, GL_TRUE);
+            set_ubo_binding(ctx, binding, bufObj, -1, -1, !range);
          else
-            set_ubo_binding(ctx, binding, bufObj, 0, 0, GL_TRUE);
+            set_ubo_binding(ctx, binding, bufObj, offset, size, !range);
       }
    }
 
@@ -3192,19 +3302,21 @@ bind_uniform_buffers_base(struct gl_context *ctx, GLuint first, GLsizei count,
 }
 
 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 +3327,7 @@ 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;
    }
 
@@ -3241,55 +3353,60 @@ bind_uniform_buffers_range(struct gl_context *ctx, GLuint first, GLsizei count,
    _mesa_begin_bufferobj_lookups(ctx);
 
    for (i = 0; i < count; i++) {
-      struct gl_uniform_buffer_binding *binding =
-         &ctx->UniformBufferBindings[first + i];
+      struct gl_shader_storage_buffer_binding *binding =
+         &ctx->ShaderStorageBufferBindings[first + i];
       struct gl_buffer_object *bufObj;
+      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;
+         }
 
-      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:
-       *
-       *     "┌───────────────────────────────────────────────────────────────┐
-       *      │ 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");
+         bufObj = _mesa_multi_bind_lookup_bufferobj(ctx, buffers, i, caller);
 
       if (bufObj) {
          if (bufObj == ctx->Shared->NullBufferObj)
-            set_ubo_binding(ctx, binding, bufObj, -1, -1, GL_FALSE);
+            set_ssbo_binding(ctx, binding, bufObj, -1, -1, !range);
          else
-            set_ubo_binding(ctx, binding, bufObj,
-                            offsets[i], sizes[i], GL_FALSE);
+            set_ssbo_binding(ctx, binding, bufObj, offset, size, !range);
       }
    }
 
@@ -3361,84 +3478,19 @@ unbind_xfb_buffers(struct gl_context *ctx,
 }
 
 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");
-
-      if (bufObj)
-         _mesa_set_transform_feedback_binding(ctx, tfObj, first + i,
-                                              bufObj, 0, 0);
-   }
-
-   _mesa_end_bufferobj_lookups(ctx);
-}
-
-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 */
@@ -3483,55 +3535,64 @@ bind_xfb_buffers_range(struct gl_context *ctx,
       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) {
+         offset = offsets[i];
+         size = sizes[i];
 
-      /* 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 (!bind_buffers_check_offset_and_size(ctx, i, offsets, sizes))
+            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;
+         /* 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;
+         }
+
+         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");
+         bufObj = _mesa_multi_bind_lookup_bufferobj(ctx, buffers, i, caller);
 
       if (bufObj)
          _mesa_set_transform_feedback_binding(ctx, tfObj, index, bufObj,
-                                              offsets[i], sizes[i]);
+                                              offset, size);
    }
 
    _mesa_end_bufferobj_lookups(ctx);
@@ -3581,82 +3642,18 @@ unbind_atomic_buffers(struct gl_context *ctx, GLuint first, GLsizei count)
 }
 
 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);
-}
-
-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 */
@@ -3701,45 +3698,51 @@ bind_atomic_buffers_range(struct gl_context *ctx,
       struct gl_atomic_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;
+         }
+
+         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");
+         bufObj = _mesa_multi_bind_lookup_bufferobj(ctx, buffers, i, caller);
 
       if (bufObj)
-         set_atomic_buffer_binding(ctx, binding, bufObj, offsets[i], sizes[i]);
+         set_atomic_buffer_binding(ctx, binding, bufObj, offset, size);
    }
 
    _mesa_end_bufferobj_lookups(ctx);
@@ -3752,12 +3755,18 @@ _mesa_BindBufferRange(GLenum target, GLuint index,
    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;
    } else {
       bufObj = _mesa_lookup_bufferobj(ctx, buffer);
    }
-   if (!_mesa_handle_bind_buffer_gen(ctx, target, buffer,
+   if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
                                      &bufObj, "glBindBufferRange"))
       return;
 
@@ -3777,12 +3786,17 @@ _mesa_BindBufferRange(GLenum target, GLuint index,
 
    switch (target) {
    case GL_TRANSFORM_FEEDBACK_BUFFER:
-      _mesa_bind_buffer_range_transform_feedback(ctx, index, bufObj,
-                                                offset, size);
+      _mesa_bind_buffer_range_transform_feedback(ctx,
+                                                 ctx->TransformFeedback.CurrentObject,
+                                                 index, bufObj, offset, size,
+                                                 false);
       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_atomic_buffer(ctx, index, bufObj, offset, size,
                          "glBindBufferRange");
@@ -3799,12 +3813,17 @@ _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;
    } else {
       bufObj = _mesa_lookup_bufferobj(ctx, buffer);
    }
-   if (!_mesa_handle_bind_buffer_gen(ctx, target, buffer,
+   if (!_mesa_handle_bind_buffer_gen(ctx, buffer,
                                      &bufObj, "glBindBufferBase"))
       return;
 
@@ -3842,11 +3861,16 @@ _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");
@@ -3864,20 +3888,32 @@ _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;
    }
 }
@@ -3888,19 +3924,31 @@ _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;
    }
 }
@@ -3913,10 +3961,16 @@ _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 +3981,7 @@ _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 +4002,8 @@ _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;
+   if (ctx->Driver.InvalidateBufferSubData)
+      ctx->Driver.InvalidateBufferSubData(ctx, bufObj, offset, length);
 }
 
 void GLAPIENTRY
@@ -3960,10 +4012,16 @@ _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 +4040,6 @@ _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.
-    */
-   return;
+   if (ctx->Driver.InvalidateBufferSubData)
+      ctx->Driver.InvalidateBufferSubData(ctx, bufObj, 0, bufObj->Size);
 }