vbo: remove redundant code in vbo_exec_fixup_vertex

[mesa.git] / src / mesa / vbo / vbo_exec_api.c

/**************************************************************************

Copyright 2002-2008 VMware, Inc.

All Rights Reserved.

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/*
 * Authors:
 *   Keith Whitwell <keithw@vmware.com>
 */

#include "main/glheader.h"
#include "main/bufferobj.h"
#include "main/context.h"
#include "main/macros.h"
#include "main/vtxfmt.h"
#include "main/dlist.h"
#include "main/eval.h"
#include "main/state.h"
#include "main/light.h"
#include "main/api_arrayelt.h"
#include "main/draw_validate.h"
#include "main/dispatch.h"
#include "util/bitscan.h"

#include "vbo_noop.h"
#include "vbo_private.h"


/** ID/name for immediate-mode VBO */
#define IMM_BUFFER_NAME 0xaabbccdd


static void
vbo_reset_all_attr(struct vbo_exec_context *exec);


/**
 * Close off the last primitive, execute the buffer, restart the
 * primitive.  This is called when we fill a vertex buffer before
 * hitting glEnd.
 */
static void
vbo_exec_wrap_buffers(struct vbo_exec_context *exec)
{
   if (exec->vtx.prim_count == 0) {
      exec->vtx.copied.nr = 0;
      exec->vtx.vert_count = 0;
      exec->vtx.buffer_ptr = exec->vtx.buffer_map;
   }
   else {
      struct _mesa_prim *last_prim = &exec->vtx.prim[exec->vtx.prim_count - 1];
      const GLuint last_begin = last_prim->begin;
      GLuint last_count;

      if (_mesa_inside_begin_end(exec->ctx)) {
         last_prim->count = exec->vtx.vert_count - last_prim->start;
      }

      last_count = last_prim->count;

      /* Special handling for wrapping GL_LINE_LOOP */
      if (last_prim->mode == GL_LINE_LOOP &&
          last_count > 0 &&
          !last_prim->end) {
         /* draw this section of the incomplete line loop as a line strip */
         last_prim->mode = GL_LINE_STRIP;
         if (!last_prim->begin) {
            /* This is not the first section of the line loop, so don't
             * draw the 0th vertex.  We're saving it until we draw the
             * very last section of the loop.
             */
            last_prim->start++;
            last_prim->count--;
         }
      }

      /* Execute the buffer and save copied vertices.
       */
      if (exec->vtx.vert_count)
         vbo_exec_vtx_flush(exec);
      else {
         exec->vtx.prim_count = 0;
         exec->vtx.copied.nr = 0;
      }

      /* Emit a glBegin to start the new list.
       */
      assert(exec->vtx.prim_count == 0);

      if (_mesa_inside_begin_end(exec->ctx)) {
         exec->vtx.prim[0].mode = exec->ctx->Driver.CurrentExecPrimitive;
         exec->vtx.prim[0].begin = 0;
         exec->vtx.prim[0].end = 0;
         exec->vtx.prim[0].start = 0;
         exec->vtx.prim[0].count = 0;
         exec->vtx.prim_count++;

         if (exec->vtx.copied.nr == last_count)
            exec->vtx.prim[0].begin = last_begin;
      }
   }
}


/**
 * Deal with buffer wrapping where provoked by the vertex buffer
 * filling up, as opposed to upgrade_vertex().
 */
static void
vbo_exec_vtx_wrap(struct vbo_exec_context *exec)
{
   unsigned numComponents;

   /* Run pipeline on current vertices, copy wrapped vertices
    * to exec->vtx.copied.
    */
   vbo_exec_wrap_buffers(exec);

   if (!exec->vtx.buffer_ptr) {
      /* probably ran out of memory earlier when allocating the VBO */
      return;
   }

   /* Copy stored stored vertices to start of new list.
    */
   assert(exec->vtx.max_vert - exec->vtx.vert_count > exec->vtx.copied.nr);

   numComponents = exec->vtx.copied.nr * exec->vtx.vertex_size;
   memcpy(exec->vtx.buffer_ptr,
          exec->vtx.copied.buffer,
          numComponents * sizeof(fi_type));
   exec->vtx.buffer_ptr += numComponents;
   exec->vtx.vert_count += exec->vtx.copied.nr;

   exec->vtx.copied.nr = 0;
}


/**
 * Copy the active vertex's values to the ctx->Current fields.
 */
static void
vbo_exec_copy_to_current(struct vbo_exec_context *exec)
{
   struct gl_context *ctx = exec->ctx;
   struct vbo_context *vbo = vbo_context(ctx);
   GLbitfield64 enabled = exec->vtx.enabled & (~BITFIELD64_BIT(VBO_ATTRIB_POS));

   while (enabled) {
      const int i = u_bit_scan64(&enabled);

      /* Note: the exec->vtx.current[i] pointers point into the
       * ctx->Current.Attrib and ctx->Light.Material.Attrib arrays.
       */
      GLfloat *current = (GLfloat *)vbo->current[i].Ptr;
      fi_type tmp[8]; /* space for doubles */
      int dmul = 1;

      if (exec->vtx.attr[i].type == GL_DOUBLE ||
          exec->vtx.attr[i].type == GL_UNSIGNED_INT64_ARB)
         dmul = 2;

      assert(exec->vtx.attr[i].size);

      if (exec->vtx.attr[i].type == GL_DOUBLE ||
          exec->vtx.attr[i].type == GL_UNSIGNED_INT64_ARB) {
         memset(tmp, 0, sizeof(tmp));
         memcpy(tmp, exec->vtx.attrptr[i], exec->vtx.attr[i].size * sizeof(GLfloat));
      } else {
         COPY_CLEAN_4V_TYPE_AS_UNION(tmp,
                                     exec->vtx.attr[i].size,
                                     exec->vtx.attrptr[i],
                                     exec->vtx.attr[i].type);
      }

      if (exec->vtx.attr[i].type != vbo->current[i].Format.Type ||
          memcmp(current, tmp, 4 * sizeof(GLfloat) * dmul) != 0) {
         memcpy(current, tmp, 4 * sizeof(GLfloat) * dmul);

         /* Given that we explicitly state size here, there is no need
          * for the COPY_CLEAN above, could just copy 16 bytes and be
          * done.  The only problem is when Mesa accesses ctx->Current
          * directly.
          */
         /* Size here is in components - not bytes */
         vbo_set_vertex_format(&vbo->current[i].Format,
                               exec->vtx.attr[i].size / dmul,
                               exec->vtx.attr[i].type);

         /* This triggers rather too much recalculation of Mesa state
          * that doesn't get used (eg light positions).
          */
         if (i >= VBO_ATTRIB_MAT_FRONT_AMBIENT &&
             i <= VBO_ATTRIB_MAT_BACK_INDEXES)
            ctx->NewState |= _NEW_LIGHT;

         ctx->NewState |= _NEW_CURRENT_ATTRIB;
      }
   }

   /* Colormaterial -- this kindof sucks.
    */
   if (ctx->Light.ColorMaterialEnabled &&
       exec->vtx.attr[VBO_ATTRIB_COLOR0].size) {
      _mesa_update_color_material(ctx,
                                  ctx->Current.Attrib[VBO_ATTRIB_COLOR0]);
   }
}


/**
 * Flush existing data, set new attrib size, replay copied vertices.
 * This is called when we transition from a small vertex attribute size
 * to a larger one.  Ex: glTexCoord2f -> glTexCoord4f.
 * We need to go back over the previous 2-component texcoords and insert
 * zero and one values.
 * \param attr  VBO_ATTRIB_x vertex attribute value
 */
static void
vbo_exec_wrap_upgrade_vertex(struct vbo_exec_context *exec,
                             GLuint attr, GLuint newSize)
{
   struct gl_context *ctx = exec->ctx;
   struct vbo_context *vbo = vbo_context(ctx);
   const GLint lastcount = exec->vtx.vert_count;
   fi_type *old_attrptr[VBO_ATTRIB_MAX];
   const GLuint old_vtx_size_no_pos = exec->vtx.vertex_size_no_pos;
   const GLuint old_vtx_size = exec->vtx.vertex_size; /* floats per vertex */
   const GLuint oldSize = exec->vtx.attr[attr].size;
   GLuint i;

   assert(attr < VBO_ATTRIB_MAX);

   /* Run pipeline on current vertices, copy wrapped vertices
    * to exec->vtx.copied.
    */
   vbo_exec_wrap_buffers(exec);

   if (unlikely(exec->vtx.copied.nr)) {
      /* We're in the middle of a primitive, keep the old vertex
       * format around to be able to translate the copied vertices to
       * the new format.
       */
      memcpy(old_attrptr, exec->vtx.attrptr, sizeof(old_attrptr));
   }

   /* Heuristic: Attempt to isolate attributes received outside
    * begin/end so that they don't bloat the vertices.
    */
   if (!_mesa_inside_begin_end(ctx) &&
       !oldSize && lastcount > 8 && exec->vtx.vertex_size) {
      vbo_exec_copy_to_current(exec);
      vbo_reset_all_attr(exec);
   }

   /* Fix up sizes:
    */
   exec->vtx.attr[attr].size = newSize;
   exec->vtx.vertex_size += newSize - oldSize;
   exec->vtx.vertex_size_no_pos = exec->vtx.vertex_size - exec->vtx.attr[0].size;
   exec->vtx.max_vert = vbo_compute_max_verts(exec);
   exec->vtx.vert_count = 0;
   exec->vtx.buffer_ptr = exec->vtx.buffer_map;
   exec->vtx.enabled |= BITFIELD64_BIT(attr);

   if (attr != 0) {
      if (unlikely(oldSize)) {
         unsigned offset = exec->vtx.attrptr[attr] - exec->vtx.vertex;

         /* If there are attribs after the resized attrib... */
         if (offset + oldSize < old_vtx_size_no_pos) {
            int size_diff = newSize - oldSize;
            fi_type *old_first = exec->vtx.attrptr[attr] + oldSize;
            fi_type *new_first = exec->vtx.attrptr[attr] + newSize;
            fi_type *old_last = exec->vtx.vertex + old_vtx_size_no_pos - 1;
            fi_type *new_last = exec->vtx.vertex + exec->vtx.vertex_size_no_pos - 1;

            if (size_diff < 0) {
               /* Decreasing the size: Copy from first to last to move
                * elements to the left.
                */
               fi_type *old_end = old_last + 1;
               fi_type *old = old_first;
               fi_type *new = new_first;

               do {
                  *new++ = *old++;
               } while (old != old_end);
            } else {
               /* Increasing the size: Copy from last to first to move
                * elements to the right.
                */
               fi_type *old_end = old_first - 1;
               fi_type *old = old_last;
               fi_type *new = new_last;

               do {
                  *new-- = *old--;
               } while (old != old_end);
            }

            /* Update pointers to attribs, because we moved them. */
            GLbitfield64 enabled = exec->vtx.enabled &
                                   ~BITFIELD64_BIT(VBO_ATTRIB_POS) &
                                   ~BITFIELD64_BIT(attr);
            while (enabled) {
               unsigned i = u_bit_scan64(&enabled);

               if (exec->vtx.attrptr[i] > exec->vtx.attrptr[attr])
                  exec->vtx.attrptr[i] += size_diff;
            }
         }
      } else {
         /* Just have to append the new attribute at the end */
         exec->vtx.attrptr[attr] = exec->vtx.vertex +
           exec->vtx.vertex_size_no_pos - newSize;
      }
   }

   /* The position is always last. */
   exec->vtx.attrptr[0] = exec->vtx.vertex + exec->vtx.vertex_size_no_pos;

   /* Replay stored vertices to translate them
    * to new format here.
    *
    * -- No need to replay - just copy piecewise
    */
   if (unlikely(exec->vtx.copied.nr)) {
      fi_type *data = exec->vtx.copied.buffer;
      fi_type *dest = exec->vtx.buffer_ptr;

      assert(exec->vtx.buffer_ptr == exec->vtx.buffer_map);

      for (i = 0 ; i < exec->vtx.copied.nr ; i++) {
         GLbitfield64 enabled = exec->vtx.enabled;
         while (enabled) {
            const int j = u_bit_scan64(&enabled);
            GLuint sz = exec->vtx.attr[j].size;
            GLint old_offset = old_attrptr[j] - exec->vtx.vertex;
            GLint new_offset = exec->vtx.attrptr[j] - exec->vtx.vertex;

            assert(sz);

            if (j == attr) {
               if (oldSize) {
                  fi_type tmp[4];
                  COPY_CLEAN_4V_TYPE_AS_UNION(tmp, oldSize,
                                              data + old_offset,
                                              exec->vtx.attr[j].type);
                  COPY_SZ_4V(dest + new_offset, newSize, tmp);
               } else {
                  fi_type *current = (fi_type *)vbo->current[j].Ptr;
                  COPY_SZ_4V(dest + new_offset, sz, current);
               }
            }
            else {
               COPY_SZ_4V(dest + new_offset, sz, data + old_offset);
            }
         }

         data += old_vtx_size;
         dest += exec->vtx.vertex_size;
      }

      exec->vtx.buffer_ptr = dest;
      exec->vtx.vert_count += exec->vtx.copied.nr;
      exec->vtx.copied.nr = 0;
   }
}


/**
 * This is when a vertex attribute transitions to a different size.
 * For example, we saw a bunch of glTexCoord2f() calls and now we got a
 * glTexCoord4f() call.  We promote the array from size=2 to size=4.
 * \param newSize  size of new vertex (number of 32-bit words).
 * \param attr  VBO_ATTRIB_x vertex attribute value
 */
static void
vbo_exec_fixup_vertex(struct gl_context *ctx, GLuint attr,
                      GLuint newSize, GLenum newType)
{
   struct vbo_exec_context *exec = &vbo_context(ctx)->exec;

   assert(attr < VBO_ATTRIB_MAX);

   if (newSize > exec->vtx.attr[attr].size ||
       newType != exec->vtx.attr[attr].type) {
      /* New size is larger.  Need to flush existing vertices and get
       * an enlarged vertex format.
       */
      vbo_exec_wrap_upgrade_vertex(exec, attr, newSize);
   }
   else if (newSize < exec->vtx.attr[attr].active_size) {
      GLuint i;
      const fi_type *id =
            vbo_get_default_vals_as_union(exec->vtx.attr[attr].type);

      /* New size is smaller - just need to fill in some
       * zeros.  Don't need to flush or wrap.
       */
      for (i = newSize; i <= exec->vtx.attr[attr].size; i++)
         exec->vtx.attrptr[attr][i-1] = id[i-1];
   }

   exec->vtx.attr[attr].active_size = newSize;
   exec->vtx.attr[attr].type = newType;
}


/**
 * If index=0, does glVertexAttrib*() alias glVertex() to emit a vertex?
 * It depends on a few things, including whether we're inside or outside
 * of glBegin/glEnd.
 */
static inline bool
is_vertex_position(const struct gl_context *ctx, GLuint index)
{
   return (index == 0 &&
           _mesa_attr_zero_aliases_vertex(ctx) &&
           _mesa_inside_begin_end(ctx));
}

/* Write a 64-bit value into a 32-bit pointer by preserving endianness. */
#if UTIL_ARCH_LITTLE_ENDIAN
   #define SET_64BIT(dst32, u64) do { \
         *(dst32)++ = (u64); \
         *(dst32)++ = (uint64_t)(u64) >> 32; \
      } while (0)
#else
   #define SET_64BIT(dst32, u64) do { \
         *(dst32)++ = (uint64_t)(u64) >> 32; \
         *(dst32)++ = (u64); \
      } while (0)
#endif


/**
 * This macro is used to implement all the glVertex, glColor, glTexCoord,
 * glVertexAttrib, etc functions.
 * \param A  VBO_ATTRIB_x attribute index
 * \param N  attribute size (1..4)
 * \param T  type (GL_FLOAT, GL_DOUBLE, GL_INT, GL_UNSIGNED_INT)
 * \param C  cast type (uint32_t or uint64_t)
 * \param V0, V1, v2, V3  attribute value
 */
#define ATTR_UNION(A, N, T, C, V0, V1, V2, V3)                          \
do {                                                                    \
   struct vbo_exec_context *exec = &vbo_context(ctx)->exec;             \
   int sz = (sizeof(C) / sizeof(GLfloat));                              \
                                                                        \
   assert(sz == 1 || sz == 2);                                          \
                                                                        \
   /* check if attribute size or type is changing */                    \
   if (unlikely(exec->vtx.attr[A].active_size != N * sz ||              \
                exec->vtx.attr[A].type != T)) {                         \
      vbo_exec_fixup_vertex(ctx, A, N * sz, T);                         \
   }                                                                    \
                                                                        \
   /* store a copy of the attribute in exec except for glVertex */      \
   if ((A) != 0) {                                                      \
      C *dest = (C *)exec->vtx.attrptr[A];                              \
      if (N>0) dest[0] = V0;                                            \
      if (N>1) dest[1] = V1;                                            \
      if (N>2) dest[2] = V2;                                            \
      if (N>3) dest[3] = V3;                                            \
      assert(exec->vtx.attr[A].type == T);                              \
   }                                                                    \
                                                                        \
   if ((A) == 0) {                                                      \
      /* This is a glVertex call */                                     \
      uint32_t *dst = (uint32_t *)exec->vtx.buffer_ptr;                 \
      uint32_t *src = (uint32_t *)exec->vtx.vertex;                     \
      unsigned vertex_size_no_pos = exec->vtx.vertex_size_no_pos;       \
                                                                        \
      /* Copy over attributes from exec. */                             \
      for (unsigned i = 0; i < vertex_size_no_pos; i++)                 \
         *dst++ = *src++;                                               \
                                                                        \
      /* Store the position, which is always last and can have 32 or */ \
      /* 64 bits per channel. */                                        \
      if (sizeof(C) == 4) {                                             \
         if (N > 0) *dst++ = V0;                                        \
         if (N > 1) *dst++ = V1;                                        \
         if (N > 2) *dst++ = V2;                                        \
         if (N > 3) *dst++ = V3;                                        \
      } else {                                                          \
         /* 64 bits: dst can be unaligned, so copy each 4-byte word */  \
         /* separately */                                               \
         if (N > 0) SET_64BIT(dst, V0);                                 \
         if (N > 1) SET_64BIT(dst, V1);                                 \
         if (N > 2) SET_64BIT(dst, V2);                                 \
         if (N > 3) SET_64BIT(dst, V3);                                 \
      }                                                                 \
                                                                        \
      /* dst now points at the beginning of the next vertex */          \
      exec->vtx.buffer_ptr = (fi_type*)dst;                             \
                                                                        \
      /* Don't set FLUSH_UPDATE_CURRENT because */                      \
      /* Current.Attrib[VBO_ATTRIB_POS] is never used. */               \
                                                                        \
      if (unlikely(++exec->vtx.vert_count >= exec->vtx.max_vert))       \
         vbo_exec_vtx_wrap(exec);                                       \
   } else {                                                             \
      /* we now have accumulated per-vertex attributes */               \
      ctx->Driver.NeedFlush |= FLUSH_UPDATE_CURRENT;                    \
   }                                                                    \
} while (0)


#undef ERROR
#define ERROR(err) _mesa_error(ctx, err, __func__)
#define TAG(x) vbo_exec_##x

#include "vbo_attrib_tmp.h"



/**
 * Execute a glMaterial call.  Note that if GL_COLOR_MATERIAL is enabled,
 * this may be a (partial) no-op.
 */
static void GLAPIENTRY
vbo_exec_Materialfv(GLenum face, GLenum pname, const GLfloat *params)
{
   GLbitfield updateMats;
   GET_CURRENT_CONTEXT(ctx);

   /* This function should be a no-op when it tries to update material
    * attributes which are currently tracking glColor via glColorMaterial.
    * The updateMats var will be a mask of the MAT_BIT_FRONT/BACK_x bits
    * indicating which material attributes can actually be updated below.
    */
   if (ctx->Light.ColorMaterialEnabled) {
      updateMats = ~ctx->Light._ColorMaterialBitmask;
   }
   else {
      /* GL_COLOR_MATERIAL is disabled so don't skip any material updates */
      updateMats = ALL_MATERIAL_BITS;
   }

   if (ctx->API == API_OPENGL_COMPAT && face == GL_FRONT) {
      updateMats &= FRONT_MATERIAL_BITS;
   }
   else if (ctx->API == API_OPENGL_COMPAT && face == GL_BACK) {
      updateMats &= BACK_MATERIAL_BITS;
   }
   else if (face != GL_FRONT_AND_BACK) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glMaterial(invalid face)");
      return;
   }

   switch (pname) {
   case GL_EMISSION:
      if (updateMats & MAT_BIT_FRONT_EMISSION)
         MAT_ATTR(VBO_ATTRIB_MAT_FRONT_EMISSION, 4, params);
      if (updateMats & MAT_BIT_BACK_EMISSION)
         MAT_ATTR(VBO_ATTRIB_MAT_BACK_EMISSION, 4, params);
      break;
   case GL_AMBIENT:
      if (updateMats & MAT_BIT_FRONT_AMBIENT)
         MAT_ATTR(VBO_ATTRIB_MAT_FRONT_AMBIENT, 4, params);
      if (updateMats & MAT_BIT_BACK_AMBIENT)
         MAT_ATTR(VBO_ATTRIB_MAT_BACK_AMBIENT, 4, params);
      break;
   case GL_DIFFUSE:
      if (updateMats & MAT_BIT_FRONT_DIFFUSE)
         MAT_ATTR(VBO_ATTRIB_MAT_FRONT_DIFFUSE, 4, params);
      if (updateMats & MAT_BIT_BACK_DIFFUSE)
         MAT_ATTR(VBO_ATTRIB_MAT_BACK_DIFFUSE, 4, params);
      break;
   case GL_SPECULAR:
      if (updateMats & MAT_BIT_FRONT_SPECULAR)
         MAT_ATTR(VBO_ATTRIB_MAT_FRONT_SPECULAR, 4, params);
      if (updateMats & MAT_BIT_BACK_SPECULAR)
         MAT_ATTR(VBO_ATTRIB_MAT_BACK_SPECULAR, 4, params);
      break;
   case GL_SHININESS:
      if (*params < 0 || *params > ctx->Const.MaxShininess) {
         _mesa_error(ctx, GL_INVALID_VALUE,
                     "glMaterial(invalid shininess: %f out range [0, %f])",
                     *params, ctx->Const.MaxShininess);
         return;
      }
      if (updateMats & MAT_BIT_FRONT_SHININESS)
         MAT_ATTR(VBO_ATTRIB_MAT_FRONT_SHININESS, 1, params);
      if (updateMats & MAT_BIT_BACK_SHININESS)
         MAT_ATTR(VBO_ATTRIB_MAT_BACK_SHININESS, 1, params);
      break;
   case GL_COLOR_INDEXES:
      if (ctx->API != API_OPENGL_COMPAT) {
         _mesa_error(ctx, GL_INVALID_ENUM, "glMaterialfv(pname)");
         return;
      }
      if (updateMats & MAT_BIT_FRONT_INDEXES)
         MAT_ATTR(VBO_ATTRIB_MAT_FRONT_INDEXES, 3, params);
      if (updateMats & MAT_BIT_BACK_INDEXES)
         MAT_ATTR(VBO_ATTRIB_MAT_BACK_INDEXES, 3, params);
      break;
   case GL_AMBIENT_AND_DIFFUSE:
      if (updateMats & MAT_BIT_FRONT_AMBIENT)
         MAT_ATTR(VBO_ATTRIB_MAT_FRONT_AMBIENT, 4, params);
      if (updateMats & MAT_BIT_FRONT_DIFFUSE)
         MAT_ATTR(VBO_ATTRIB_MAT_FRONT_DIFFUSE, 4, params);
      if (updateMats & MAT_BIT_BACK_AMBIENT)
         MAT_ATTR(VBO_ATTRIB_MAT_BACK_AMBIENT, 4, params);
      if (updateMats & MAT_BIT_BACK_DIFFUSE)
         MAT_ATTR(VBO_ATTRIB_MAT_BACK_DIFFUSE, 4, params);
      break;
   default:
      _mesa_error(ctx, GL_INVALID_ENUM, "glMaterialfv(pname)");
      return;
   }
}


/**
 * Flush (draw) vertices.
 *
 * \param flags  bitmask of FLUSH_STORED_VERTICES, FLUSH_UPDATE_CURRENT
 */
static void
vbo_exec_FlushVertices_internal(struct vbo_exec_context *exec, unsigned flags)
{
   struct gl_context *ctx = exec->ctx;

   if (flags & FLUSH_STORED_VERTICES) {
      if (exec->vtx.vert_count) {
         vbo_exec_vtx_flush(exec);
      }

      if (exec->vtx.vertex_size) {
         vbo_exec_copy_to_current(exec);
         vbo_reset_all_attr(exec);
      }

      /* All done. */
      ctx->Driver.NeedFlush = 0;
   } else {
      assert(flags == FLUSH_UPDATE_CURRENT);

      /* Note that the vertex size is unchanged.
       * (vbo_reset_all_attr isn't called)
       */
      vbo_exec_copy_to_current(exec);

      /* Only FLUSH_UPDATE_CURRENT is done. */
      ctx->Driver.NeedFlush = ~FLUSH_UPDATE_CURRENT;
   }
}


static void GLAPIENTRY
vbo_exec_EvalCoord1f(GLfloat u)
{
   GET_CURRENT_CONTEXT(ctx);
   struct vbo_exec_context *exec = &vbo_context(ctx)->exec;

   {
      GLint i;
      if (exec->eval.recalculate_maps)
         vbo_exec_eval_update(exec);

      for (i = 0; i <= VBO_ATTRIB_TEX7; i++) {
         if (exec->eval.map1[i].map)
            if (exec->vtx.attr[i].active_size != exec->eval.map1[i].sz)
               vbo_exec_fixup_vertex(ctx, i, exec->eval.map1[i].sz, GL_FLOAT);
      }
   }

   memcpy(exec->vtx.copied.buffer, exec->vtx.vertex,
          exec->vtx.vertex_size * sizeof(GLfloat));

   vbo_exec_do_EvalCoord1f(exec, u);

   memcpy(exec->vtx.vertex, exec->vtx.copied.buffer,
          exec->vtx.vertex_size * sizeof(GLfloat));
}


static void GLAPIENTRY
vbo_exec_EvalCoord2f(GLfloat u, GLfloat v)
{
   GET_CURRENT_CONTEXT(ctx);
   struct vbo_exec_context *exec = &vbo_context(ctx)->exec;

   {
      GLint i;
      if (exec->eval.recalculate_maps)
         vbo_exec_eval_update(exec);

      for (i = 0; i <= VBO_ATTRIB_TEX7; i++) {
         if (exec->eval.map2[i].map)
            if (exec->vtx.attr[i].active_size != exec->eval.map2[i].sz)
               vbo_exec_fixup_vertex(ctx, i, exec->eval.map2[i].sz, GL_FLOAT);
      }

      if (ctx->Eval.AutoNormal)
         if (exec->vtx.attr[VBO_ATTRIB_NORMAL].active_size != 3)
            vbo_exec_fixup_vertex(ctx, VBO_ATTRIB_NORMAL, 3, GL_FLOAT);
   }

   memcpy(exec->vtx.copied.buffer, exec->vtx.vertex,
          exec->vtx.vertex_size * sizeof(GLfloat));

   vbo_exec_do_EvalCoord2f(exec, u, v);

   memcpy(exec->vtx.vertex, exec->vtx.copied.buffer,
          exec->vtx.vertex_size * sizeof(GLfloat));
}


static void GLAPIENTRY
vbo_exec_EvalCoord1fv(const GLfloat *u)
{
   vbo_exec_EvalCoord1f(u[0]);
}


static void GLAPIENTRY
vbo_exec_EvalCoord2fv(const GLfloat *u)
{
   vbo_exec_EvalCoord2f(u[0], u[1]);
}


static void GLAPIENTRY
vbo_exec_EvalPoint1(GLint i)
{
   GET_CURRENT_CONTEXT(ctx);
   GLfloat du = ((ctx->Eval.MapGrid1u2 - ctx->Eval.MapGrid1u1) /
                 (GLfloat) ctx->Eval.MapGrid1un);
   GLfloat u = i * du + ctx->Eval.MapGrid1u1;

   vbo_exec_EvalCoord1f(u);
}


static void GLAPIENTRY
vbo_exec_EvalPoint2(GLint i, GLint j)
{
   GET_CURRENT_CONTEXT(ctx);
   GLfloat du = ((ctx->Eval.MapGrid2u2 - ctx->Eval.MapGrid2u1) /
                 (GLfloat) ctx->Eval.MapGrid2un);
   GLfloat dv = ((ctx->Eval.MapGrid2v2 - ctx->Eval.MapGrid2v1) /
                 (GLfloat) ctx->Eval.MapGrid2vn);
   GLfloat u = i * du + ctx->Eval.MapGrid2u1;
   GLfloat v = j * dv + ctx->Eval.MapGrid2v1;

   vbo_exec_EvalCoord2f(u, v);
}


/**
 * Called via glBegin.
 */
static void GLAPIENTRY
vbo_exec_Begin(GLenum mode)
{
   GET_CURRENT_CONTEXT(ctx);
   struct vbo_context *vbo = vbo_context(ctx);
   struct vbo_exec_context *exec = &vbo->exec;
   int i;

   if (_mesa_inside_begin_end(ctx)) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glBegin");
      return;
   }

   if (!_mesa_valid_prim_mode(ctx, mode, "glBegin")) {
      return;
   }

   if (!_mesa_valid_to_render(ctx, "glBegin")) {
      return;
   }

   /* Heuristic: attempt to isolate attributes occurring outside
    * begin/end pairs.
    *
    * Use FLUSH_STORED_VERTICES, because it updates current attribs and
    * sets vertex_size to 0. (FLUSH_UPDATE_CURRENT doesn't change vertex_size)
    */
   if (exec->vtx.vertex_size && !exec->vtx.attr[VBO_ATTRIB_POS].size)
      vbo_exec_FlushVertices_internal(exec, FLUSH_STORED_VERTICES);

   i = exec->vtx.prim_count++;
   exec->vtx.prim[i].mode = mode;
   exec->vtx.prim[i].begin = 1;
   exec->vtx.prim[i].end = 0;
   exec->vtx.prim[i].indexed = 0;
   exec->vtx.prim[i].start = exec->vtx.vert_count;
   exec->vtx.prim[i].count = 0;
   exec->vtx.prim[i].num_instances = 1;
   exec->vtx.prim[i].base_instance = 0;

   ctx->Driver.CurrentExecPrimitive = mode;

   ctx->Exec = ctx->BeginEnd;

   /* We may have been called from a display list, in which case we should
    * leave dlist.c's dispatch table in place.
    */
   if (ctx->CurrentClientDispatch == ctx->MarshalExec) {
      ctx->CurrentServerDispatch = ctx->Exec;
   } else if (ctx->CurrentClientDispatch == ctx->OutsideBeginEnd) {
      ctx->CurrentClientDispatch = ctx->Exec;
      _glapi_set_dispatch(ctx->CurrentClientDispatch);
   } else {
      assert(ctx->CurrentClientDispatch == ctx->Save);
   }
}


/**
 * Try to merge / concatenate the two most recent VBO primitives.
 */
static void
try_vbo_merge(struct vbo_exec_context *exec)
{
   struct _mesa_prim *cur =  &exec->vtx.prim[exec->vtx.prim_count - 1];

   assert(exec->vtx.prim_count >= 1);

   vbo_try_prim_conversion(cur);

   if (exec->vtx.prim_count >= 2) {
      struct _mesa_prim *prev = &exec->vtx.prim[exec->vtx.prim_count - 2];
      assert(prev == cur - 1);

      if (vbo_can_merge_prims(prev, cur)) {
         assert(cur->begin);
         assert(cur->end);
         assert(prev->begin);
         assert(prev->end);
         vbo_merge_prims(prev, cur);
         exec->vtx.prim_count--;  /* drop the last primitive */
      }
   }
}


/**
 * Called via glEnd.
 */
static void GLAPIENTRY
vbo_exec_End(void)
{
   GET_CURRENT_CONTEXT(ctx);
   struct vbo_exec_context *exec = &vbo_context(ctx)->exec;

   if (!_mesa_inside_begin_end(ctx)) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glEnd");
      return;
   }

   ctx->Exec = ctx->OutsideBeginEnd;

   if (ctx->CurrentClientDispatch == ctx->MarshalExec) {
      ctx->CurrentServerDispatch = ctx->Exec;
   } else if (ctx->CurrentClientDispatch == ctx->BeginEnd) {
      ctx->CurrentClientDispatch = ctx->Exec;
      _glapi_set_dispatch(ctx->CurrentClientDispatch);
   }

   if (exec->vtx.prim_count > 0) {
      /* close off current primitive */
      struct _mesa_prim *last_prim = &exec->vtx.prim[exec->vtx.prim_count - 1];
      unsigned count = exec->vtx.vert_count - last_prim->start;

      last_prim->end = 1;
      last_prim->count = count;

      if (count)
         ctx->Driver.NeedFlush |= FLUSH_STORED_VERTICES;

      /* Special handling for GL_LINE_LOOP */
      if (last_prim->mode == GL_LINE_LOOP && last_prim->begin == 0) {
         /* We're finishing drawing a line loop.  Append 0th vertex onto
          * end of vertex buffer so we can draw it as a line strip.
          */
         const fi_type *src = exec->vtx.buffer_map +
            last_prim->start * exec->vtx.vertex_size;
         fi_type *dst = exec->vtx.buffer_map +
            exec->vtx.vert_count * exec->vtx.vertex_size;

         /* copy 0th vertex to end of buffer */
         memcpy(dst, src, exec->vtx.vertex_size * sizeof(fi_type));

         last_prim->start++;  /* skip vertex0 */
         /* note that last_prim->count stays unchanged */
         last_prim->mode = GL_LINE_STRIP;

         /* Increment the vertex count so the next primitive doesn't
          * overwrite the last vertex which we just added.
          */
         exec->vtx.vert_count++;
         exec->vtx.buffer_ptr += exec->vtx.vertex_size;
      }

      try_vbo_merge(exec);
   }

   ctx->Driver.CurrentExecPrimitive = PRIM_OUTSIDE_BEGIN_END;

   if (exec->vtx.prim_count == VBO_MAX_PRIM)
      vbo_exec_vtx_flush(exec);

   if (MESA_DEBUG_FLAGS & DEBUG_ALWAYS_FLUSH) {
      _mesa_flush(ctx);
   }
}


/**
 * Called via glPrimitiveRestartNV()
 */
static void GLAPIENTRY
vbo_exec_PrimitiveRestartNV(void)
{
   GLenum curPrim;
   GET_CURRENT_CONTEXT(ctx);

   curPrim = ctx->Driver.CurrentExecPrimitive;

   if (curPrim == PRIM_OUTSIDE_BEGIN_END) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glPrimitiveRestartNV");
   }
   else {
      vbo_exec_End();
      vbo_exec_Begin(curPrim);
   }
}


static void
vbo_exec_vtxfmt_init(struct vbo_exec_context *exec)
{
   struct gl_context *ctx = exec->ctx;
   GLvertexformat *vfmt = &exec->vtxfmt;

#define NAME_AE(x) _ae_##x
#define NAME_CALLLIST(x) _mesa_##x
#define NAME(x) vbo_exec_##x
#define NAME_ES(x) _es_##x

#include "vbo_init_tmp.h"
}


static void
vbo_reset_all_attr(struct vbo_exec_context *exec)
{
   while (exec->vtx.enabled) {
      const int i = u_bit_scan64(&exec->vtx.enabled);

      /* Reset the vertex attribute by setting its size to zero. */
      exec->vtx.attr[i].size = 0;
      exec->vtx.attr[i].type = GL_FLOAT;
      exec->vtx.attr[i].active_size = 0;
      exec->vtx.attrptr[i] = NULL;
   }

   exec->vtx.vertex_size = 0;
}


void
vbo_exec_vtx_init(struct vbo_exec_context *exec, bool use_buffer_objects)
{
   struct gl_context *ctx = exec->ctx;

   if (use_buffer_objects) {
      /* Use buffer objects for immediate mode. */
      struct vbo_exec_context *exec = &vbo_context(ctx)->exec;

      exec->vtx.bufferobj = ctx->Driver.NewBufferObject(ctx, IMM_BUFFER_NAME);

      /* Map the buffer. */
      vbo_exec_vtx_map(exec);
      assert(exec->vtx.buffer_ptr);
   } else {
      /* Use allocated memory for immediate mode. */
      _mesa_reference_buffer_object(ctx,
                                    &exec->vtx.bufferobj,
                                    ctx->Shared->NullBufferObj);

      exec->vtx.buffer_map = _mesa_align_malloc(VBO_VERT_BUFFER_SIZE, 64);
      exec->vtx.buffer_ptr = exec->vtx.buffer_map;
   }

   vbo_exec_vtxfmt_init(exec);
   _mesa_noop_vtxfmt_init(ctx, &exec->vtxfmt_noop);

   exec->vtx.enabled = u_bit_consecutive64(0, VBO_ATTRIB_MAX); /* reset all */
   vbo_reset_all_attr(exec);
}


void
vbo_exec_vtx_destroy(struct vbo_exec_context *exec)
{
   /* using a real VBO for vertex data */
   struct gl_context *ctx = exec->ctx;

   /* True VBOs should already be unmapped
    */
   if (exec->vtx.buffer_map) {
      assert(exec->vtx.bufferobj->Name == 0 ||
             exec->vtx.bufferobj->Name == IMM_BUFFER_NAME);
      if (exec->vtx.bufferobj->Name == 0) {
         _mesa_align_free(exec->vtx.buffer_map);
         exec->vtx.buffer_map = NULL;
         exec->vtx.buffer_ptr = NULL;
      }
   }

   /* Free the vertex buffer.  Unmap first if needed.
    */
   if (_mesa_bufferobj_mapped(exec->vtx.bufferobj, MAP_INTERNAL)) {
      ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
   }
   _mesa_reference_buffer_object(ctx, &exec->vtx.bufferobj, NULL);
}


/**
 * If inside glBegin()/glEnd(), it should assert(0).  Otherwise, if
 * FLUSH_STORED_VERTICES bit in \p flags is set flushes any buffered
 * vertices, if FLUSH_UPDATE_CURRENT bit is set updates
 * __struct gl_contextRec::Current and gl_light_attrib::Material
 *
 * Note that the default T&L engine never clears the
 * FLUSH_UPDATE_CURRENT bit, even after performing the update.
 *
 * \param flags  bitmask of FLUSH_STORED_VERTICES, FLUSH_UPDATE_CURRENT
 */
void
vbo_exec_FlushVertices(struct gl_context *ctx, GLuint flags)
{
   struct vbo_exec_context *exec = &vbo_context(ctx)->exec;

#ifndef NDEBUG
   /* debug check: make sure we don't get called recursively */
   exec->flush_call_depth++;
   assert(exec->flush_call_depth == 1);
#endif

   if (_mesa_inside_begin_end(ctx)) {
      /* We've had glBegin but not glEnd! */
#ifndef NDEBUG
      exec->flush_call_depth--;
      assert(exec->flush_call_depth == 0);
#endif
      return;
   }

   /* Flush (draw). */
   vbo_exec_FlushVertices_internal(exec, flags);

#ifndef NDEBUG
   exec->flush_call_depth--;
   assert(exec->flush_call_depth == 0);
#endif
}


void GLAPIENTRY
_es_Color4f(GLfloat r, GLfloat g, GLfloat b, GLfloat a)
{
   vbo_exec_Color4f(r, g, b, a);
}


void GLAPIENTRY
_es_Normal3f(GLfloat x, GLfloat y, GLfloat z)
{
   vbo_exec_Normal3f(x, y, z);
}


void GLAPIENTRY
_es_MultiTexCoord4f(GLenum target, GLfloat s, GLfloat t, GLfloat r, GLfloat q)
{
   vbo_exec_MultiTexCoord4f(target, s, t, r, q);
}


void GLAPIENTRY
_es_Materialfv(GLenum face, GLenum pname, const GLfloat *params)
{
   vbo_exec_Materialfv(face, pname, params);
}


void GLAPIENTRY
_es_Materialf(GLenum face, GLenum pname, GLfloat param)
{
   GLfloat p[4];
   p[0] = param;
   p[1] = p[2] = p[3] = 0.0F;
   vbo_exec_Materialfv(face, pname, p);
}


/**
 * A special version of glVertexAttrib4f that does not treat index 0 as
 * VBO_ATTRIB_POS.
 */
static void
VertexAttrib4f_nopos(GLuint index, GLfloat x, GLfloat y, GLfloat z, GLfloat w)
{
   GET_CURRENT_CONTEXT(ctx);
   if (index < MAX_VERTEX_GENERIC_ATTRIBS)
      ATTRF(VBO_ATTRIB_GENERIC0 + index, 4, x, y, z, w);
   else
      ERROR(GL_INVALID_VALUE);
}

void GLAPIENTRY
_es_VertexAttrib4f(GLuint index, GLfloat x, GLfloat y, GLfloat z, GLfloat w)
{
   VertexAttrib4f_nopos(index, x, y, z, w);
}


void GLAPIENTRY
_es_VertexAttrib1f(GLuint indx, GLfloat x)
{
   VertexAttrib4f_nopos(indx, x, 0.0f, 0.0f, 1.0f);
}


void GLAPIENTRY
_es_VertexAttrib1fv(GLuint indx, const GLfloat* values)
{
   VertexAttrib4f_nopos(indx, values[0], 0.0f, 0.0f, 1.0f);
}


void GLAPIENTRY
_es_VertexAttrib2f(GLuint indx, GLfloat x, GLfloat y)
{
   VertexAttrib4f_nopos(indx, x, y, 0.0f, 1.0f);
}


void GLAPIENTRY
_es_VertexAttrib2fv(GLuint indx, const GLfloat* values)
{
   VertexAttrib4f_nopos(indx, values[0], values[1], 0.0f, 1.0f);
}


void GLAPIENTRY
_es_VertexAttrib3f(GLuint indx, GLfloat x, GLfloat y, GLfloat z)
{
   VertexAttrib4f_nopos(indx, x, y, z, 1.0f);
}


void GLAPIENTRY
_es_VertexAttrib3fv(GLuint indx, const GLfloat* values)
{
   VertexAttrib4f_nopos(indx, values[0], values[1], values[2], 1.0f);
}


void GLAPIENTRY
_es_VertexAttrib4fv(GLuint indx, const GLfloat* values)
{
   VertexAttrib4f_nopos(indx, values[0], values[1], values[2], values[3]);
}