vbo: minor clean-up in vbo_exec_api.c

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

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

Copyright 2002-2008 VMware, Inc.

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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/api_validate.h"
#include "main/dispatch.h"
#include "util/bitscan.h"

#include "vbo_context.h"
#include "vbo_noop.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, GL_FALSE );
      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->currval[i].Ptr;
      fi_type tmp[8]; /* space for doubles */
      int dmul = exec->vtx.attrtype[i] == GL_DOUBLE ? 2 : 1;

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

      if (exec->vtx.attrtype[i] == GL_DOUBLE) {
         memset(tmp, 0, sizeof(tmp));
         memcpy(tmp, exec->vtx.attrptr[i], exec->vtx.attrsz[i] * sizeof(GLfloat));
      } else {
         COPY_CLEAN_4V_TYPE_AS_UNION(tmp,
                                     exec->vtx.attrsz[i],
                                     exec->vtx.attrptr[i],
                                     exec->vtx.attrtype[i]);
      }

      if (exec->vtx.attrtype[i] != vbo->currval[i].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->currval[i].Size = exec->vtx.attrsz[i] / dmul;
         vbo->currval[i]._ElementSize = vbo->currval[i].Size * sizeof(GLfloat) * dmul;
         vbo->currval[i].Type = exec->vtx.attrtype[i];
         vbo->currval[i].Integer =
            vbo_attrtype_to_integer_flag(exec->vtx.attrtype[i]);
         vbo->currval[i].Doubles =
            vbo_attrtype_to_double_flag(exec->vtx.attrtype[i]);

         /* 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.attrsz[VBO_ATTRIB_COLOR0]) {
      _mesa_update_color_material(ctx, 
                                  ctx->Current.Attrib[VBO_ATTRIB_COLOR0]);
   }
}


/**
 * Copy current vertex attribute values into the current vertex.
 */
static void
vbo_exec_copy_from_current(struct vbo_exec_context *exec)
{
   struct gl_context *ctx = exec->ctx;
   struct vbo_context *vbo = vbo_context(ctx);
   GLint i;

   for (i = VBO_ATTRIB_POS + 1; i < VBO_ATTRIB_MAX; i++) {
      if (exec->vtx.attrtype[i] == GL_DOUBLE) {
         memcpy(exec->vtx.attrptr[i], vbo->currval[i].Ptr, exec->vtx.attrsz[i] * sizeof(GLfloat));
      } else {
         const fi_type *current = (fi_type *) vbo->currval[i].Ptr;
         switch (exec->vtx.attrsz[i]) {
         case 4: exec->vtx.attrptr[i][3] = current[3];
         case 3: exec->vtx.attrptr[i][2] = current[2];
         case 2: exec->vtx.attrptr[i][1] = current[1];
         case 1: exec->vtx.attrptr[i][0] = current[0];
            break;
         }
      }
   }
}


/**
 * 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.
 */ 
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 = exec->vtx.vertex_size; /* floats per vertex */
   const GLuint oldSize = exec->vtx.attrsz[attr];
   GLuint i;

   /* 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));
   }

   if (unlikely(oldSize)) {
      /* Do a COPY_TO_CURRENT to ensure back-copying works for the
       * case when the attribute already exists in the vertex and is
       * having its size increased.
       */
      vbo_exec_copy_to_current( exec );
   }

   /* 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.attrsz[attr] = newSize;
   exec->vtx.vertex_size += newSize - oldSize;
   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 (unlikely(oldSize)) {
      /* Size changed, recalculate all the attrptr[] values
       */
      fi_type *tmp = exec->vtx.vertex;

      for (i = 0 ; i < VBO_ATTRIB_MAX ; i++) {
         if (exec->vtx.attrsz[i]) {
            exec->vtx.attrptr[i] = tmp;
            tmp += exec->vtx.attrsz[i];
         }
         else
            exec->vtx.attrptr[i] = NULL; /* will not be dereferenced */
      }

      /* Copy from current to repopulate the vertex with correct
       * values.
       */
      vbo_exec_copy_from_current( exec );
   }
   else {
      /* Just have to append the new attribute at the end */
      exec->vtx.attrptr[attr] = exec->vtx.vertex +
        exec->vtx.vertex_size - newSize;
   }

   /* 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.attrsz[j];
            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.attrtype[j]);
                  COPY_SZ_4V(dest + new_offset, newSize, tmp);
               } else {
                  fi_type *current = (fi_type *)vbo->currval[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).
 */
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;

   if (newSize > exec->vtx.attrsz[attr] ||
       newType != exec->vtx.attrtype[attr]) {
      /* 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.active_sz[attr]) {
      GLuint i;
      const fi_type *id =
            vbo_get_default_vals_as_union(exec->vtx.attrtype[attr]);

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

   exec->vtx.active_sz[attr] = newSize;
   exec->vtx.attrtype[attr] = newType;

   /* Does setting NeedFlush belong here?  Necessitates resetting
    * vtxfmt on each flush (otherwise flags won't get reset
    * afterwards).
    */
   if (attr == 0) 
      ctx->Driver.NeedFlush |= FLUSH_STORED_VERTICES;
}


/**
 * Called upon first glVertex, glColor, glTexCoord, etc.
 */
static void
vbo_exec_begin_vertices(struct gl_context *ctx)
{
   struct vbo_exec_context *exec = &vbo_context(ctx)->exec;

   vbo_exec_vtx_map( exec );

   assert((ctx->Driver.NeedFlush & FLUSH_UPDATE_CURRENT) == 0);
   assert(exec->begin_vertices_flags);

   ctx->Driver.NeedFlush |= exec->begin_vertices_flags;
}


/**
 * This macro is used to implement all the glVertex, glColor, glTexCoord,
 * glVertexAttrib, etc functions.
 * \param A  attribute index
 * \param N  attribute size (1..4)
 * \param T  type (GL_FLOAT, GL_DOUBLE, GL_INT, GL_UNSIGNED_INT)
 * \param C  cast type (fi_type or double)
 * \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.active_sz[A] != N * sz) ||                    \
       unlikely(exec->vtx.attrtype[A] != T)) {                          \
      vbo_exec_fixup_vertex(ctx, A, N * sz, T);                         \
   }                                                                    \
                                                                        \
   /* store vertex attribute in vertex buffer */                        \
   {                                                                    \
      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.attrtype[A] == T);                               \
   }                                                                    \
                                                                        \
   if ((A) == 0) {                                                      \
      /* This is a glVertex call */                                     \
      GLuint i;                                                         \
                                                                        \
      if (unlikely((ctx->Driver.NeedFlush & FLUSH_UPDATE_CURRENT) == 0)) { \
         vbo_exec_begin_vertices(ctx);                                  \
      }                                                                 \
                                                                        \
      if (unlikely(!exec->vtx.buffer_ptr)) {                            \
         vbo_exec_vtx_map(exec);                                        \
      }                                                                 \
      assert(exec->vtx.buffer_ptr);                                     \
                                                                        \
      /* copy 32-bit words */                                           \
      for (i = 0; i < exec->vtx.vertex_size; i++)                       \
         exec->vtx.buffer_ptr[i] = exec->vtx.vertex[i];                 \
                                                                        \
      exec->vtx.buffer_ptr += exec->vtx.vertex_size;                    \
                                                                        \
      /* Set FLUSH_STORED_VERTICES to indicate that there's now */      \
      /* something to draw (not just updating a color or texcoord).*/   \
      ctx->Driver.NeedFlush |= FLUSH_STORED_VERTICES;                   \
                                                                        \
      if (++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_##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_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  unmap - leave VBO unmapped after flushing?
 */
static void
vbo_exec_FlushVertices_internal(struct vbo_exec_context *exec, GLboolean unmap)
{
   if (exec->vtx.vert_count || unmap) {
      vbo_exec_vtx_flush( exec, unmap );
   }

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


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.active_sz[i] != 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.active_sz[i] != 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.active_sz[VBO_ATTRIB_NORMAL] != 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_exec_context *exec = &vbo_context(ctx)->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;
   }

   vbo_draw_method(vbo_context(ctx), DRAW_BEGIN_END);

   if (ctx->NewState) {
      _mesa_update_state( ctx );

      CALL_Begin(ctx->Exec, (mode));
      return;
   }

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

   /* Heuristic: attempt to isolate attributes occurring outside
    * begin/end pairs.
    */
   if (exec->vtx.vertex_size && !exec->vtx.attrsz[0])
      vbo_exec_FlushVertices_internal(exec, GL_FALSE);

   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].weak = 0;
   exec->vtx.prim[i].pad = 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;
   exec->vtx.prim[i].is_indirect = 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->CurrentDispatch == ctx->OutsideBeginEnd) {
      ctx->CurrentDispatch = ctx->BeginEnd;
      _glapi_set_dispatch(ctx->CurrentDispatch);
   } else {
      assert(ctx->CurrentDispatch == 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->CurrentDispatch == ctx->BeginEnd) {
      ctx->CurrentDispatch = ctx->OutsideBeginEnd;
      _glapi_set_dispatch(ctx->CurrentDispatch);
   }

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

      last_prim->end = 1;
      last_prim->count = exec->vtx.vert_count - last_prim->start;

      /* 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, GL_FALSE );

   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;

   vfmt->ArrayElement = _ae_ArrayElement;

   vfmt->Begin = vbo_exec_Begin;
   vfmt->End = vbo_exec_End;
   vfmt->PrimitiveRestartNV = vbo_exec_PrimitiveRestartNV;

   vfmt->CallList = _mesa_CallList;
   vfmt->CallLists = _mesa_CallLists;

   vfmt->EvalCoord1f = vbo_exec_EvalCoord1f;
   vfmt->EvalCoord1fv = vbo_exec_EvalCoord1fv;
   vfmt->EvalCoord2f = vbo_exec_EvalCoord2f;
   vfmt->EvalCoord2fv = vbo_exec_EvalCoord2fv;
   vfmt->EvalPoint1 = vbo_exec_EvalPoint1;
   vfmt->EvalPoint2 = vbo_exec_EvalPoint2;

   /* from attrib_tmp.h:
    */
   vfmt->Color3f = vbo_Color3f;
   vfmt->Color3fv = vbo_Color3fv;
   vfmt->Color4f = vbo_Color4f;
   vfmt->Color4fv = vbo_Color4fv;
   vfmt->FogCoordfEXT = vbo_FogCoordfEXT;
   vfmt->FogCoordfvEXT = vbo_FogCoordfvEXT;
   vfmt->MultiTexCoord1fARB = vbo_MultiTexCoord1f;
   vfmt->MultiTexCoord1fvARB = vbo_MultiTexCoord1fv;
   vfmt->MultiTexCoord2fARB = vbo_MultiTexCoord2f;
   vfmt->MultiTexCoord2fvARB = vbo_MultiTexCoord2fv;
   vfmt->MultiTexCoord3fARB = vbo_MultiTexCoord3f;
   vfmt->MultiTexCoord3fvARB = vbo_MultiTexCoord3fv;
   vfmt->MultiTexCoord4fARB = vbo_MultiTexCoord4f;
   vfmt->MultiTexCoord4fvARB = vbo_MultiTexCoord4fv;
   vfmt->Normal3f = vbo_Normal3f;
   vfmt->Normal3fv = vbo_Normal3fv;
   vfmt->SecondaryColor3fEXT = vbo_SecondaryColor3fEXT;
   vfmt->SecondaryColor3fvEXT = vbo_SecondaryColor3fvEXT;
   vfmt->TexCoord1f = vbo_TexCoord1f;
   vfmt->TexCoord1fv = vbo_TexCoord1fv;
   vfmt->TexCoord2f = vbo_TexCoord2f;
   vfmt->TexCoord2fv = vbo_TexCoord2fv;
   vfmt->TexCoord3f = vbo_TexCoord3f;
   vfmt->TexCoord3fv = vbo_TexCoord3fv;
   vfmt->TexCoord4f = vbo_TexCoord4f;
   vfmt->TexCoord4fv = vbo_TexCoord4fv;
   vfmt->Vertex2f = vbo_Vertex2f;
   vfmt->Vertex2fv = vbo_Vertex2fv;
   vfmt->Vertex3f = vbo_Vertex3f;
   vfmt->Vertex3fv = vbo_Vertex3fv;
   vfmt->Vertex4f = vbo_Vertex4f;
   vfmt->Vertex4fv = vbo_Vertex4fv;
   
   if (ctx->API == API_OPENGLES2) {
      vfmt->VertexAttrib1fARB = _es_VertexAttrib1f;
      vfmt->VertexAttrib1fvARB = _es_VertexAttrib1fv;
      vfmt->VertexAttrib2fARB = _es_VertexAttrib2f;
      vfmt->VertexAttrib2fvARB = _es_VertexAttrib2fv;
      vfmt->VertexAttrib3fARB = _es_VertexAttrib3f;
      vfmt->VertexAttrib3fvARB = _es_VertexAttrib3fv;
      vfmt->VertexAttrib4fARB = _es_VertexAttrib4f;
      vfmt->VertexAttrib4fvARB = _es_VertexAttrib4fv;
   } else {
      vfmt->VertexAttrib1fARB = vbo_VertexAttrib1fARB;
      vfmt->VertexAttrib1fvARB = vbo_VertexAttrib1fvARB;
      vfmt->VertexAttrib2fARB = vbo_VertexAttrib2fARB;
      vfmt->VertexAttrib2fvARB = vbo_VertexAttrib2fvARB;
      vfmt->VertexAttrib3fARB = vbo_VertexAttrib3fARB;
      vfmt->VertexAttrib3fvARB = vbo_VertexAttrib3fvARB;
      vfmt->VertexAttrib4fARB = vbo_VertexAttrib4fARB;
      vfmt->VertexAttrib4fvARB = vbo_VertexAttrib4fvARB;
   }

   /* Note that VertexAttrib4fNV is used from dlist.c and api_arrayelt.c so
    * they can have a single entrypoint for updating any of the legacy
    * attribs.
    */
   vfmt->VertexAttrib1fNV = vbo_VertexAttrib1fNV;
   vfmt->VertexAttrib1fvNV = vbo_VertexAttrib1fvNV;
   vfmt->VertexAttrib2fNV = vbo_VertexAttrib2fNV;
   vfmt->VertexAttrib2fvNV = vbo_VertexAttrib2fvNV;
   vfmt->VertexAttrib3fNV = vbo_VertexAttrib3fNV;
   vfmt->VertexAttrib3fvNV = vbo_VertexAttrib3fvNV;
   vfmt->VertexAttrib4fNV = vbo_VertexAttrib4fNV;
   vfmt->VertexAttrib4fvNV = vbo_VertexAttrib4fvNV;

   /* integer-valued */
   vfmt->VertexAttribI1i = vbo_VertexAttribI1i;
   vfmt->VertexAttribI2i = vbo_VertexAttribI2i;
   vfmt->VertexAttribI3i = vbo_VertexAttribI3i;
   vfmt->VertexAttribI4i = vbo_VertexAttribI4i;
   vfmt->VertexAttribI2iv = vbo_VertexAttribI2iv;
   vfmt->VertexAttribI3iv = vbo_VertexAttribI3iv;
   vfmt->VertexAttribI4iv = vbo_VertexAttribI4iv;

   /* unsigned integer-valued */
   vfmt->VertexAttribI1ui = vbo_VertexAttribI1ui;
   vfmt->VertexAttribI2ui = vbo_VertexAttribI2ui;
   vfmt->VertexAttribI3ui = vbo_VertexAttribI3ui;
   vfmt->VertexAttribI4ui = vbo_VertexAttribI4ui;
   vfmt->VertexAttribI2uiv = vbo_VertexAttribI2uiv;
   vfmt->VertexAttribI3uiv = vbo_VertexAttribI3uiv;
   vfmt->VertexAttribI4uiv = vbo_VertexAttribI4uiv;

   vfmt->Materialfv = vbo_Materialfv;

   vfmt->EdgeFlag = vbo_EdgeFlag;
   vfmt->Indexf = vbo_Indexf;
   vfmt->Indexfv = vbo_Indexfv;

   /* ARB_vertex_type_2_10_10_10_rev */
   vfmt->VertexP2ui = vbo_VertexP2ui;
   vfmt->VertexP2uiv = vbo_VertexP2uiv;
   vfmt->VertexP3ui = vbo_VertexP3ui;
   vfmt->VertexP3uiv = vbo_VertexP3uiv;
   vfmt->VertexP4ui = vbo_VertexP4ui;
   vfmt->VertexP4uiv = vbo_VertexP4uiv;

   vfmt->TexCoordP1ui = vbo_TexCoordP1ui;
   vfmt->TexCoordP1uiv = vbo_TexCoordP1uiv;
   vfmt->TexCoordP2ui = vbo_TexCoordP2ui;
   vfmt->TexCoordP2uiv = vbo_TexCoordP2uiv;
   vfmt->TexCoordP3ui = vbo_TexCoordP3ui;
   vfmt->TexCoordP3uiv = vbo_TexCoordP3uiv;
   vfmt->TexCoordP4ui = vbo_TexCoordP4ui;
   vfmt->TexCoordP4uiv = vbo_TexCoordP4uiv;

   vfmt->MultiTexCoordP1ui = vbo_MultiTexCoordP1ui;
   vfmt->MultiTexCoordP1uiv = vbo_MultiTexCoordP1uiv;
   vfmt->MultiTexCoordP2ui = vbo_MultiTexCoordP2ui;
   vfmt->MultiTexCoordP2uiv = vbo_MultiTexCoordP2uiv;
   vfmt->MultiTexCoordP3ui = vbo_MultiTexCoordP3ui;
   vfmt->MultiTexCoordP3uiv = vbo_MultiTexCoordP3uiv;
   vfmt->MultiTexCoordP4ui = vbo_MultiTexCoordP4ui;
   vfmt->MultiTexCoordP4uiv = vbo_MultiTexCoordP4uiv;
   
   vfmt->NormalP3ui = vbo_NormalP3ui;
   vfmt->NormalP3uiv = vbo_NormalP3uiv;

   vfmt->ColorP3ui = vbo_ColorP3ui;
   vfmt->ColorP3uiv = vbo_ColorP3uiv;
   vfmt->ColorP4ui = vbo_ColorP4ui;
   vfmt->ColorP4uiv = vbo_ColorP4uiv;

   vfmt->SecondaryColorP3ui = vbo_SecondaryColorP3ui;
   vfmt->SecondaryColorP3uiv = vbo_SecondaryColorP3uiv;

   vfmt->VertexAttribP1ui = vbo_VertexAttribP1ui;
   vfmt->VertexAttribP1uiv = vbo_VertexAttribP1uiv;
   vfmt->VertexAttribP2ui = vbo_VertexAttribP2ui;
   vfmt->VertexAttribP2uiv = vbo_VertexAttribP2uiv;
   vfmt->VertexAttribP3ui = vbo_VertexAttribP3ui;
   vfmt->VertexAttribP3uiv = vbo_VertexAttribP3uiv;
   vfmt->VertexAttribP4ui = vbo_VertexAttribP4ui;
   vfmt->VertexAttribP4uiv = vbo_VertexAttribP4uiv;

   vfmt->VertexAttribL1d = vbo_VertexAttribL1d;
   vfmt->VertexAttribL2d = vbo_VertexAttribL2d;
   vfmt->VertexAttribL3d = vbo_VertexAttribL3d;
   vfmt->VertexAttribL4d = vbo_VertexAttribL4d;

   vfmt->VertexAttribL1dv = vbo_VertexAttribL1dv;
   vfmt->VertexAttribL2dv = vbo_VertexAttribL2dv;
   vfmt->VertexAttribL3dv = vbo_VertexAttribL3dv;
   vfmt->VertexAttribL4dv = vbo_VertexAttribL4dv;
}


/**
 * Tell the VBO module to use a real OpenGL vertex buffer object to
 * store accumulated immediate-mode vertex data.
 * This replaces the malloced buffer which was created in
 * vb_exec_vtx_init() below.
 */
void vbo_use_buffer_objects(struct gl_context *ctx)
{
   struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
   /* Any buffer name but 0 can be used here since this bufferobj won't
    * go into the bufferobj hashtable.
    */
   GLuint bufName = IMM_BUFFER_NAME;
   GLenum target = GL_ARRAY_BUFFER_ARB;
   GLenum usage = GL_STREAM_DRAW_ARB;
   GLsizei size = VBO_VERT_BUFFER_SIZE;

   /* Make sure this func is only used once */
   assert(exec->vtx.bufferobj == ctx->Shared->NullBufferObj);

   _mesa_align_free(exec->vtx.buffer_map);
   exec->vtx.buffer_map = NULL;
   exec->vtx.buffer_ptr = NULL;

   /* Allocate a real buffer object now */
   _mesa_reference_buffer_object(ctx, &exec->vtx.bufferobj, NULL);
   exec->vtx.bufferobj = ctx->Driver.NewBufferObject(ctx, bufName);
   if (!ctx->Driver.BufferData(ctx, target, size, NULL, usage,
                               GL_MAP_WRITE_BIT |
                               GL_DYNAMIC_STORAGE_BIT |
                               GL_CLIENT_STORAGE_BIT,
                               exec->vtx.bufferobj)) {
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
   }
}


/**
 * If this function is called, all VBO buffers will be unmapped when
 * we flush.
 * Otherwise, if a simple command like glColor3f() is called and we flush,
 * the current VBO may be left mapped.
 */
void
vbo_always_unmap_buffers(struct gl_context *ctx)
{
   struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
   exec->begin_vertices_flags |= FLUSH_STORED_VERTICES;
}


void vbo_exec_vtx_init( struct vbo_exec_context *exec )
{
   struct gl_context *ctx = exec->ctx;
   struct vbo_context *vbo = vbo_context(ctx);
   GLuint i;

   /* Allocate a buffer object.  Will just reuse this object
    * continuously, unless vbo_use_buffer_objects() is called to enable
    * use of real VBOs.
    */
   _mesa_reference_buffer_object(ctx,
                                 &exec->vtx.bufferobj,
                                 ctx->Shared->NullBufferObj);

   assert(!exec->vtx.buffer_map);
   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(&exec->vtxfmt_noop);

   exec->vtx.enabled = 0;
   for (i = 0 ; i < VBO_ATTRIB_MAX ; i++) {
      assert(i < ARRAY_SIZE(exec->vtx.attrsz));
      exec->vtx.attrsz[i] = 0;
      assert(i < ARRAY_SIZE(exec->vtx.attrtype));
      exec->vtx.attrtype[i] = GL_FLOAT;
      assert(i < ARRAY_SIZE(exec->vtx.active_sz));
      exec->vtx.active_sz[i] = 0;
   }
   for (i = 0 ; i < VERT_ATTRIB_MAX; i++) {
      assert(i < ARRAY_SIZE(exec->vtx.inputs));
      assert(i < ARRAY_SIZE(exec->vtx.arrays));
      exec->vtx.inputs[i] = &exec->vtx.arrays[i];
   }
   
   {
      struct gl_client_array *arrays = exec->vtx.arrays;
      unsigned i;

      memcpy(arrays, &vbo->currval[VBO_ATTRIB_POS],
             VERT_ATTRIB_FF_MAX * sizeof(arrays[0]));
      for (i = 0; i < VERT_ATTRIB_FF_MAX; ++i) {
         struct gl_client_array *array;
         array = &arrays[VERT_ATTRIB_FF(i)];
         array->BufferObj = NULL;
         _mesa_reference_buffer_object(ctx, &array->BufferObj,
                                 vbo->currval[VBO_ATTRIB_POS+i].BufferObj);
      }

      memcpy(arrays + VERT_ATTRIB_GENERIC(0),
             &vbo->currval[VBO_ATTRIB_GENERIC0],
             VERT_ATTRIB_GENERIC_MAX * sizeof(arrays[0]));

      for (i = 0; i < VERT_ATTRIB_GENERIC_MAX; ++i) {
         struct gl_client_array *array;
         array = &arrays[VERT_ATTRIB_GENERIC(i)];
         array->BufferObj = NULL;
         _mesa_reference_buffer_object(ctx, &array->BufferObj,
                           vbo->currval[VBO_ATTRIB_GENERIC0+i].BufferObj);
      }
   }

   exec->vtx.vertex_size = 0;

   exec->begin_vertices_flags = FLUSH_UPDATE_CURRENT;
}


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

   /* 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;
      }
   }

   /* Drop any outstanding reference to the vertex buffer
    */
   for (i = 0; i < ARRAY_SIZE(exec->vtx.arrays); i++) {
      _mesa_reference_buffer_object(ctx,
                                    &exec->vtx.arrays[i].BufferObj,
                                    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;

#ifdef DEBUG
   /* 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! */
#ifdef DEBUG
      exec->flush_call_depth--;
      assert(exec->flush_call_depth == 0);
#endif
      return;
   }

   /* Flush (draw), and make sure VBO is left unmapped when done */
   vbo_exec_FlushVertices_internal(exec, GL_TRUE);

   /* Need to do this to ensure vbo_exec_begin_vertices gets called again:
    */
   ctx->Driver.NeedFlush &= ~(FLUSH_UPDATE_CURRENT | flags);

#ifdef DEBUG
   exec->flush_call_depth--;
   assert(exec->flush_call_depth == 0);
#endif
}

/**
 * Reset the vertex attribute by setting its size to zero.
 */
static void
vbo_reset_attr(struct vbo_exec_context *exec, GLuint attr)
{
   exec->vtx.attrsz[attr] = 0;
   exec->vtx.attrtype[attr] = GL_FLOAT;
   exec->vtx.active_sz[attr] = 0;
}

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

   exec->vtx.vertex_size = 0;
}
      

void GLAPIENTRY
_es_Color4f(GLfloat r, GLfloat g, GLfloat b, GLfloat a)
{
   vbo_Color4f(r, g, b, a);
}


void GLAPIENTRY
_es_Normal3f(GLfloat x, GLfloat y, GLfloat z)
{
   vbo_Normal3f(x, y, z);
}


void GLAPIENTRY
_es_MultiTexCoord4f(GLenum target, GLfloat s, GLfloat t, GLfloat r, GLfloat q)
{
   vbo_MultiTexCoord4f(target, s, t, r, q);
}


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