Subversion Repositories Kolibri OS

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

 *

 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.

 * Copyright 2009 VMware, Inc.

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sub license, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.

 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR

 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 *

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

#include "main/glheader.h"

#include "main/context.h"

#include "main/state.h"

#include "main/api_validate.h"

#include "main/varray.h"

#include "main/bufferobj.h"

#include "main/enums.h"

#include "main/macros.h"

#include "vbo_context.h"

/**

 * Compute min and max elements by scanning the index buffer for

 * glDraw[Range]Elements() calls.

 * If primitive restart is enabled, we need to ignore restart

 * indexes when computing min/max.

 */

void

vbo_get_minmax_index(struct gl_context *ctx,

		     const struct _mesa_prim *prim,

		     const struct _mesa_index_buffer *ib,

		     GLuint *min_index, GLuint *max_index)

{

   const GLboolean restart = ctx->Array.PrimitiveRestart;

   const GLuint restartIndex = ctx->Array.RestartIndex;

   const GLuint count = prim->count;

   const void *indices;

   GLuint i;

   if (_mesa_is_bufferobj(ib->obj)) {

      const GLvoid *map =

         ctx->Driver.MapBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER_ARB,

                               GL_READ_ONLY, ib->obj);

      indices = ADD_POINTERS(map, ib->ptr);

   } else {

      indices = ib->ptr;

   }

   switch (ib->type) {

   case GL_UNSIGNED_INT: {

      const GLuint *ui_indices = (const GLuint *)indices;

      GLuint max_ui = 0;

      GLuint min_ui = ~0U;

      if (restart) {

         for (i = 0; i < count; i++) {

            if (ui_indices[i] != restartIndex) {

               if (ui_indices[i] > max_ui) max_ui = ui_indices[i];

               if (ui_indices[i] < min_ui) min_ui = ui_indices[i];

            }

         }

      }

      else {

         for (i = 0; i < count; i++) {

            if (ui_indices[i] > max_ui) max_ui = ui_indices[i];

            if (ui_indices[i] < min_ui) min_ui = ui_indices[i];

         }

      }

      *min_index = min_ui;

      *max_index = max_ui;

      break;

   }

   case GL_UNSIGNED_SHORT: {

      const GLushort *us_indices = (const GLushort *)indices;

      GLuint max_us = 0;

      GLuint min_us = ~0U;

      if (restart) {

         for (i = 0; i < count; i++) {

            if (us_indices[i] != restartIndex) {

               if (us_indices[i] > max_us) max_us = us_indices[i];

               if (us_indices[i] < min_us) min_us = us_indices[i];

            }

         }

      }

      else {

         for (i = 0; i < count; i++) {

            if (us_indices[i] > max_us) max_us = us_indices[i];

            if (us_indices[i] < min_us) min_us = us_indices[i];

         }

      }

      *min_index = min_us;

      *max_index = max_us;

      break;

   }

   case GL_UNSIGNED_BYTE: {

      const GLubyte *ub_indices = (const GLubyte *)indices;

      GLuint max_ub = 0;

      GLuint min_ub = ~0U;

      if (restart) {

         for (i = 0; i < count; i++) {

            if (ub_indices[i] != restartIndex) {

               if (ub_indices[i] > max_ub) max_ub = ub_indices[i];

               if (ub_indices[i] < min_ub) min_ub = ub_indices[i];

            }

         }

      }

      else {

         for (i = 0; i < count; i++) {

            if (ub_indices[i] > max_ub) max_ub = ub_indices[i];

            if (ub_indices[i] < min_ub) min_ub = ub_indices[i];

         }

      }

      *min_index = min_ub;

      *max_index = max_ub;

      break;

   }

   default:

      assert(0);

      break;

   }

   if (_mesa_is_bufferobj(ib->obj)) {

      ctx->Driver.UnmapBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER_ARB, ib->obj);

   }

}

/**

 * Check that element 'j' of the array has reasonable data.

 * Map VBO if needed.

 * For debugging purposes; not normally used.

 */

static void

check_array_data(struct gl_context *ctx, struct gl_client_array *array,

                 GLuint attrib, GLuint j)

{

   if (array->Enabled) {

      const void *data = array->Ptr;

      if (_mesa_is_bufferobj(array->BufferObj)) {

         if (!array->BufferObj->Pointer) {

            /* need to map now */

            array->BufferObj->Pointer =

               ctx->Driver.MapBuffer(ctx, GL_ARRAY_BUFFER_ARB,

                                     GL_READ_ONLY, array->BufferObj);

         }

         data = ADD_POINTERS(data, array->BufferObj->Pointer);

      }

      switch (array->Type) {

      case GL_FLOAT:

         {

            GLfloat *f = (GLfloat *) ((GLubyte *) data + array->StrideB * j);

            GLint k;

            for (k = 0; k < array->Size; k++) {

               if (IS_INF_OR_NAN(f[k]) ||

                   f[k] >= 1.0e20 || f[k] <= -1.0e10) {

                  printf("Bad array data:\n");

                  printf("  Element[%u].%u = %f\n", j, k, f[k]);

                  printf("  Array %u at %p\n", attrib, (void* ) array);

                  printf("  Type 0x%x, Size %d, Stride %d\n",

			 array->Type, array->Size, array->Stride);

                  printf("  Address/offset %p in Buffer Object %u\n",

			 array->Ptr, array->BufferObj->Name);

                  f[k] = 1.0; /* XXX replace the bad value! */

               }

               /*assert(!IS_INF_OR_NAN(f[k]));*/

            }

         }

         break;

      default:

         ;

      }

   }

}

/**

 * Unmap the buffer object referenced by given array, if mapped.

 */

static void

unmap_array_buffer(struct gl_context *ctx, struct gl_client_array *array)

{

   if (array->Enabled &&

       _mesa_is_bufferobj(array->BufferObj) &&

       _mesa_bufferobj_mapped(array->BufferObj)) {

      ctx->Driver.UnmapBuffer(ctx, GL_ARRAY_BUFFER_ARB, array->BufferObj);

   }

}

/**

 * Examine the array's data for NaNs, etc.

 * For debug purposes; not normally used.

 */

static void

check_draw_elements_data(struct gl_context *ctx, GLsizei count, GLenum elemType,

                         const void *elements, GLint basevertex)

{

   struct gl_array_object *arrayObj = ctx->Array.ArrayObj;

   const void *elemMap;

   GLint i, k;

   if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) {

      elemMap = ctx->Driver.MapBuffer(ctx,

                                      GL_ELEMENT_ARRAY_BUFFER_ARB,

                                      GL_READ_ONLY,

                                      ctx->Array.ElementArrayBufferObj);

      elements = ADD_POINTERS(elements, elemMap);

   }

   for (i = 0; i < count; i++) {

      GLuint j;

      /* j = element[i] */

      switch (elemType) {

      case GL_UNSIGNED_BYTE:

         j = ((const GLubyte *) elements)[i];

         break;

      case GL_UNSIGNED_SHORT:

         j = ((const GLushort *) elements)[i];

         break;

      case GL_UNSIGNED_INT:

         j = ((const GLuint *) elements)[i];

         break;

      default:

         assert(0);

      }

      /* check element j of each enabled array */

      check_array_data(ctx, &arrayObj->Vertex, VERT_ATTRIB_POS, j);

      check_array_data(ctx, &arrayObj->Normal, VERT_ATTRIB_NORMAL, j);

      check_array_data(ctx, &arrayObj->Color, VERT_ATTRIB_COLOR0, j);

      check_array_data(ctx, &arrayObj->SecondaryColor, VERT_ATTRIB_COLOR1, j);

      for (k = 0; k < Elements(arrayObj->TexCoord); k++) {

         check_array_data(ctx, &arrayObj->TexCoord[k], VERT_ATTRIB_TEX0 + k, j);

      }

      for (k = 0; k < Elements(arrayObj->VertexAttrib); k++) {

         check_array_data(ctx, &arrayObj->VertexAttrib[k],

                          VERT_ATTRIB_GENERIC0 + k, j);

      }

   }

   if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) {

      ctx->Driver.UnmapBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER_ARB,

			      ctx->Array.ElementArrayBufferObj);

   }

   unmap_array_buffer(ctx, &arrayObj->Vertex);

   unmap_array_buffer(ctx, &arrayObj->Normal);

   unmap_array_buffer(ctx, &arrayObj->Color);

   for (k = 0; k < Elements(arrayObj->TexCoord); k++) {

      unmap_array_buffer(ctx, &arrayObj->TexCoord[k]);

   }

   for (k = 0; k < Elements(arrayObj->VertexAttrib); k++) {

      unmap_array_buffer(ctx, &arrayObj->VertexAttrib[k]);

   }

}

/**

 * Check array data, looking for NaNs, etc.

 */

static void

check_draw_arrays_data(struct gl_context *ctx, GLint start, GLsizei count)

{

   /* TO DO */

}

/**

 * Print info/data for glDrawArrays(), for debugging.

 */

static void

print_draw_arrays(struct gl_context *ctx,

                  GLenum mode, GLint start, GLsizei count)

{

   struct vbo_context *vbo = vbo_context(ctx);

   struct vbo_exec_context *exec = &vbo->exec;

   int i;

   printf("vbo_exec_DrawArrays(mode 0x%x, start %d, count %d):\n",

	  mode, start, count);

   for (i = 0; i < 32; i++) {

      GLuint bufName = exec->array.inputs[i]->BufferObj->Name;

      GLint stride = exec->array.inputs[i]->Stride;

      printf("attr %2d: size %d stride %d  enabled %d  "

	     "ptr %p  Bufobj %u\n",

	     i,

	     exec->array.inputs[i]->Size,

	     stride,

	     /*exec->array.inputs[i]->Enabled,*/

	     exec->array.legacy_array[i]->Enabled,

	     exec->array.inputs[i]->Ptr,

	     bufName);

      if (bufName) {

         struct gl_buffer_object *buf = _mesa_lookup_bufferobj(ctx, bufName);

         GLubyte *p = ctx->Driver.MapBuffer(ctx, GL_ARRAY_BUFFER_ARB,

                                            GL_READ_ONLY_ARB, buf);

         int offset = (int) (GLintptr) exec->array.inputs[i]->Ptr;

         float *f = (float *) (p + offset);

         int *k = (int *) f;

         int i;

         int n = (count * stride) / 4;

         if (n > 32)

            n = 32;

         printf("  Data at offset %d:\n", offset);

         for (i = 0; i < n; i++) {

            printf("    float[%d] = 0x%08x %f\n", i, k[i], f[i]);

         }

         ctx->Driver.UnmapBuffer(ctx, GL_ARRAY_BUFFER_ARB, buf);

      }

   }

}

/**

 * Bind the VBO executor to the current vertex array object prior

 * to drawing.

 *

 * Just translate the arrayobj into a sane layout.

 */

static void

bind_array_obj(struct gl_context *ctx)

{

   struct vbo_context *vbo = vbo_context(ctx);

   struct vbo_exec_context *exec = &vbo->exec;

   struct gl_array_object *arrayObj = ctx->Array.ArrayObj;

   GLuint i;

   /* TODO: Fix the ArrayObj struct to keep legacy arrays in an array

    * rather than as individual named arrays.  Then this function can

    * go away.

    */

   exec->array.legacy_array[VERT_ATTRIB_POS] = &arrayObj->Vertex;

   exec->array.legacy_array[VERT_ATTRIB_WEIGHT] = &arrayObj->Weight;

   exec->array.legacy_array[VERT_ATTRIB_NORMAL] = &arrayObj->Normal;

   exec->array.legacy_array[VERT_ATTRIB_COLOR0] = &arrayObj->Color;

   exec->array.legacy_array[VERT_ATTRIB_COLOR1] = &arrayObj->SecondaryColor;

   exec->array.legacy_array[VERT_ATTRIB_FOG] = &arrayObj->FogCoord;

   exec->array.legacy_array[VERT_ATTRIB_COLOR_INDEX] = &arrayObj->Index;

   if (arrayObj->PointSize.Enabled) {

      /* this aliases COLOR_INDEX */

      exec->array.legacy_array[VERT_ATTRIB_POINT_SIZE] = &arrayObj->PointSize;

   }

   exec->array.legacy_array[VERT_ATTRIB_EDGEFLAG] = &arrayObj->EdgeFlag;

   for (i = 0; i < Elements(arrayObj->TexCoord); i++)

      exec->array.legacy_array[VERT_ATTRIB_TEX0 + i] = &arrayObj->TexCoord[i];

   for (i = 0; i < Elements(arrayObj->VertexAttrib); i++) {

      assert(i < Elements(exec->array.generic_array));

      exec->array.generic_array[i] = &arrayObj->VertexAttrib[i];

   }

   exec->array.array_obj = arrayObj->Name;

}

/**

 * Set the vbo->exec->inputs[] pointers to point to the enabled

 * vertex arrays.  This depends on the current vertex program/shader

 * being executed because of whether or not generic vertex arrays

 * alias the conventional vertex arrays.

 * For arrays that aren't enabled, we set the input[attrib] pointer

 * to point at a zero-stride current value "array".

 */

static void

recalculate_input_bindings(struct gl_context *ctx)

{

   struct vbo_context *vbo = vbo_context(ctx);

   struct vbo_exec_context *exec = &vbo->exec;

   const struct gl_client_array **inputs = &exec->array.inputs[0];

   GLbitfield const_inputs = 0x0;

   GLuint i;

   exec->array.program_mode = get_program_mode(ctx);

   exec->array.enabled_flags = ctx->Array.ArrayObj->_Enabled;

   switch (exec->array.program_mode) {

   case VP_NONE:

      /* When no vertex program is active (or the vertex program is generated

       * from fixed-function state).  We put the material values into the

       * generic slots.  This is the only situation where material values

       * are available as per-vertex attributes.

       */

      for (i = 0; i <= VERT_ATTRIB_TEX7; i++) {

	 if (exec->array.legacy_array[i]->Enabled)

	    inputs[i] = exec->array.legacy_array[i];

	 else {

	    inputs[i] = &vbo->legacy_currval[i];

            const_inputs |= 1 << i;

         }

      }

      for (i = 0; i < MAT_ATTRIB_MAX; i++) {

	 inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->mat_currval[i];

         const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);

      }

      /* Could use just about anything, just to fill in the empty

       * slots:

       */

      for (i = MAT_ATTRIB_MAX; i < VERT_ATTRIB_MAX - VERT_ATTRIB_GENERIC0; i++) {

	 inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->generic_currval[i];

         const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);

      }

      break;

   case VP_NV:

      /* NV_vertex_program - attribute arrays alias and override

       * conventional, legacy arrays.  No materials, and the generic

       * slots are vacant.

       */

      for (i = 0; i <= VERT_ATTRIB_TEX7; i++) {

	 if (exec->array.generic_array[i]->Enabled)

	    inputs[i] = exec->array.generic_array[i];

	 else if (exec->array.legacy_array[i]->Enabled)

	    inputs[i] = exec->array.legacy_array[i];

	 else {

	    inputs[i] = &vbo->legacy_currval[i];

            const_inputs |= 1 << i;

         }

      }

      /* Could use just about anything, just to fill in the empty

       * slots:

       */

      for (i = VERT_ATTRIB_GENERIC0; i < VERT_ATTRIB_MAX; i++) {

	 inputs[i] = &vbo->generic_currval[i - VERT_ATTRIB_GENERIC0];

         const_inputs |= 1 << i;

      }

      break;

   case VP_ARB:

      /* GL_ARB_vertex_program or GLSL vertex shader - Only the generic[0]

       * attribute array aliases and overrides the legacy position array.

       *

       * Otherwise, legacy attributes available in the legacy slots,

       * generic attributes in the generic slots and materials are not

       * available as per-vertex attributes.

       */

      if (exec->array.generic_array[0]->Enabled)

	 inputs[0] = exec->array.generic_array[0];

      else if (exec->array.legacy_array[0]->Enabled)

	 inputs[0] = exec->array.legacy_array[0];

      else {

	 inputs[0] = &vbo->legacy_currval[0];

         const_inputs |= 1 << 0;

      }

      for (i = 1; i <= VERT_ATTRIB_TEX7; i++) {

	 if (exec->array.legacy_array[i]->Enabled)

	    inputs[i] = exec->array.legacy_array[i];

	 else {

	    inputs[i] = &vbo->legacy_currval[i];

            const_inputs |= 1 << i;

         }

      }

      for (i = 0; i < MAX_VERTEX_GENERIC_ATTRIBS; i++) {

	 if (exec->array.generic_array[i]->Enabled)

	    inputs[VERT_ATTRIB_GENERIC0 + i] = exec->array.generic_array[i];

	 else {

	    inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->generic_currval[i];

            const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);

         }

      }

      break;

   }

   _mesa_set_varying_vp_inputs( ctx, ~const_inputs );

}

/**

 * Examine the enabled vertex arrays to set the exec->array.inputs[] values.

 * These will point to the arrays to actually use for drawing.  Some will

 * be user-provided arrays, other will be zero-stride const-valued arrays.

 * Note that this might set the _NEW_ARRAY dirty flag so state validation

 * must be done after this call.

 */

static void

bind_arrays(struct gl_context *ctx)

{

   bind_array_obj(ctx);

   recalculate_input_bindings(ctx);

}

/**

 * Helper function called by the other DrawArrays() functions below.

 * This is where we handle primitive restart for drawing non-indexed

 * arrays.  If primitive restart is enabled, it typically means

 * splitting one DrawArrays() into two.

 */

static void

vbo_draw_arrays(struct gl_context *ctx, GLenum mode, GLint start,

                GLsizei count, GLuint numInstances)

{

   struct vbo_context *vbo = vbo_context(ctx);

   struct vbo_exec_context *exec = &vbo->exec;

   struct _mesa_prim prim[2];

   bind_arrays(ctx);

   /* Again... because we may have changed the bitmask of per-vertex varying

    * attributes.  If we regenerate the fixed-function vertex program now

    * we may be able to prune down the number of vertex attributes which we

    * need in the shader.

    */

   if (ctx->NewState)

      _mesa_update_state(ctx);

   prim[0].begin = 1;

   prim[0].end = 1;

   prim[0].weak = 0;

   prim[0].pad = 0;

   prim[0].mode = mode;

   prim[0].start = 0; /* filled in below */

   prim[0].count = 0; /* filled in below */

   prim[0].indexed = 0;

   prim[0].basevertex = 0;

   prim[0].num_instances = numInstances;

   /* Implement the primitive restart index */

   if (ctx->Array.PrimitiveRestart && ctx->Array.RestartIndex < count) {

      GLuint primCount = 0;

      if (ctx->Array.RestartIndex == start) {

         /* special case: RestartIndex at beginning */

         if (count > 1) {

            prim[0].start = start + 1;

            prim[0].count = count - 1;

            primCount = 1;

         }

      }

      else if (ctx->Array.RestartIndex == start + count - 1) {

         /* special case: RestartIndex at end */

         if (count > 1) {

            prim[0].start = start;

            prim[0].count = count - 1;

            primCount = 1;

         }

      }

      else {

         /* general case: RestartIndex in middle, split into two prims */

         prim[0].start = start;

         prim[0].count = ctx->Array.RestartIndex - start;

         prim[1] = prim[0];

         prim[1].start = ctx->Array.RestartIndex + 1;

         prim[1].count = count - prim[1].start;

         primCount = 2;

      }

      if (primCount > 0) {

         /* draw one or two prims */

         vbo->draw_prims(ctx, exec->array.inputs, prim, primCount, NULL,

                         GL_TRUE, start, start + count - 1);

      }

   }

   else {

      /* no prim restart */

      prim[0].start = start;

      prim[0].count = count;

      vbo->draw_prims(ctx, exec->array.inputs, prim, 1, NULL,

                      GL_TRUE, start, start + count - 1);

   }

}

/**

 * Called from glDrawArrays when in immediate mode (not display list mode).

 */

static void GLAPIENTRY

vbo_exec_DrawArrays(GLenum mode, GLint start, GLsizei count)

{

   GET_CURRENT_CONTEXT(ctx);

   if (MESA_VERBOSE & VERBOSE_DRAW)

      _mesa_debug(ctx, "glDrawArrays(%s, %d, %d)\n",

                  _mesa_lookup_enum_by_nr(mode), start, count);

   if (!_mesa_validate_DrawArrays( ctx, mode, start, count ))

      return;

   FLUSH_CURRENT( ctx, 0 );

   if (!_mesa_valid_to_render(ctx, "glDrawArrays")) {

      return;

   }

   if (0)

      check_draw_arrays_data(ctx, start, count);

   vbo_draw_arrays(ctx, mode, start, count, 1);

   if (0)

      print_draw_arrays(ctx, mode, start, count);

}

/**

 * Called from glDrawArraysInstanced when in immediate mode (not

 * display list mode).

 */

static void GLAPIENTRY

vbo_exec_DrawArraysInstanced(GLenum mode, GLint start, GLsizei count,

                             GLsizei primcount)

{

   GET_CURRENT_CONTEXT(ctx);

   if (MESA_VERBOSE & VERBOSE_DRAW)

      _mesa_debug(ctx, "glDrawArraysInstanced(%s, %d, %d, %d)\n",

                  _mesa_lookup_enum_by_nr(mode), start, count, primcount);

   if (!_mesa_validate_DrawArraysInstanced(ctx, mode, start, count, primcount))

      return;

   FLUSH_CURRENT( ctx, 0 );

   if (!_mesa_valid_to_render(ctx, "glDrawArraysInstanced")) {

      return;

   }

   if (0)

      check_draw_arrays_data(ctx, start, count);

   vbo_draw_arrays(ctx, mode, start, count, primcount);

   if (0)

      print_draw_arrays(ctx, mode, start, count);

}

/**

 * Map GL_ELEMENT_ARRAY_BUFFER and print contents.

 * For debugging.

 */

static void

dump_element_buffer(struct gl_context *ctx, GLenum type)

{

   const GLvoid *map = ctx->Driver.MapBuffer(ctx,

                                             GL_ELEMENT_ARRAY_BUFFER_ARB,

                                             GL_READ_ONLY,

                                             ctx->Array.ElementArrayBufferObj);

   switch (type) {

   case GL_UNSIGNED_BYTE:

      {

         const GLubyte *us = (const GLubyte *) map;

         GLint i;

         for (i = 0; i < ctx->Array.ElementArrayBufferObj->Size; i++) {

            printf("%02x ", us[i]);

            if (i % 32 == 31)

               printf("\n");

         }

         printf("\n");

      }

      break;

   case GL_UNSIGNED_SHORT:

      {

         const GLushort *us = (const GLushort *) map;

         GLint i;

         for (i = 0; i < ctx->Array.ElementArrayBufferObj->Size / 2; i++) {

            printf("%04x ", us[i]);

            if (i % 16 == 15)

               printf("\n");

         }

         printf("\n");

      }

      break;

   case GL_UNSIGNED_INT:

      {

         const GLuint *us = (const GLuint *) map;

         GLint i;

         for (i = 0; i < ctx->Array.ElementArrayBufferObj->Size / 4; i++) {

            printf("%08x ", us[i]);

            if (i % 8 == 7)

               printf("\n");

         }

         printf("\n");

      }

      break;

   default:

      ;

   }

   ctx->Driver.UnmapBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER_ARB,

                           ctx->Array.ElementArrayBufferObj);

}

/**

 * Inner support for both _mesa_DrawElements and _mesa_DrawRangeElements.

 * Do the rendering for a glDrawElements or glDrawRangeElements call after

 * we've validated buffer bounds, etc.

 */

static void

vbo_validated_drawrangeelements(struct gl_context *ctx, GLenum mode,

				GLboolean index_bounds_valid,

				GLuint start, GLuint end,

				GLsizei count, GLenum type,

				const GLvoid *indices,

				GLint basevertex, GLint primcount)

{

   struct vbo_context *vbo = vbo_context(ctx);

   struct vbo_exec_context *exec = &vbo->exec;

   struct _mesa_index_buffer ib;

   struct _mesa_prim prim[1];

   FLUSH_CURRENT( ctx, 0 );

   if (!_mesa_valid_to_render(ctx, "glDraw[Range]Elements")) {

      return;

   }

   bind_arrays( ctx );

   /* check for dirty state again */

   if (ctx->NewState)

      _mesa_update_state( ctx );

   ib.count = count;

   ib.type = type;

   ib.obj = ctx->Array.ElementArrayBufferObj;

   ib.ptr = indices;

   prim[0].begin = 1;

   prim[0].end = 1;

   prim[0].weak = 0;

   prim[0].pad = 0;

   prim[0].mode = mode;

   prim[0].start = 0;

   prim[0].count = count;

   prim[0].indexed = 1;

   prim[0].basevertex = basevertex;

   prim[0].num_instances = primcount;

   /* Need to give special consideration to rendering a range of

    * indices starting somewhere above zero.  Typically the

    * application is issuing multiple DrawRangeElements() to draw

    * successive primitives layed out linearly in the vertex arrays.

    * Unless the vertex arrays are all in a VBO (or locked as with

    * CVA), the OpenGL semantics imply that we need to re-read or

    * re-upload the vertex data on each draw call.

    *

    * In the case of hardware tnl, we want to avoid starting the

    * upload at zero, as it will mean every draw call uploads an

    * increasing amount of not-used vertex data.  Worse - in the

    * software tnl module, all those vertices might be transformed and

    * lit but never rendered.

    *

    * If we just upload or transform the vertices in start..end,

    * however, the indices will be incorrect.

    *

    * At this level, we don't know exactly what the requirements of

    * the backend are going to be, though it will likely boil down to

    * either:

    *

    * 1) Do nothing, everything is in a VBO and is processed once

    *       only.

    *

    * 2) Adjust the indices and vertex arrays so that start becomes

    *    zero.

    *

    * Rather than doing anything here, I'll provide a helper function

    * for the latter case elsewhere.

    */

   vbo->draw_prims( ctx, exec->array.inputs, prim, 1, &ib,

		    index_bounds_valid, start, end );

}

/**

 * Called by glDrawRangeElementsBaseVertex() in immediate mode.

 */

static void GLAPIENTRY

vbo_exec_DrawRangeElementsBaseVertex(GLenum mode,

				     GLuint start, GLuint end,

				     GLsizei count, GLenum type,

				     const GLvoid *indices,

				     GLint basevertex)

{

   static GLuint warnCount = 0;

   GET_CURRENT_CONTEXT(ctx);

   if (MESA_VERBOSE & VERBOSE_DRAW)

      _mesa_debug(ctx,

                "glDrawRangeElementsBaseVertex(%s, %u, %u, %d, %s, %p, %d)\n",

                _mesa_lookup_enum_by_nr(mode), start, end, count,

                _mesa_lookup_enum_by_nr(type), indices, basevertex);

   if (!_mesa_validate_DrawRangeElements( ctx, mode, start, end, count,

                                          type, indices, basevertex ))

      return;

   /* NOTE: It's important that 'end' is a reasonable value.

    * in _tnl_draw_prims(), we use end to determine how many vertices

    * to transform.  If it's too large, we can unnecessarily split prims

    * or we can read/write out of memory in several different places!

    */

   /* Catch/fix some potential user errors */

   if (type == GL_UNSIGNED_BYTE) {

      start = MIN2(start, 0xff);

      end = MIN2(end, 0xff);

   }

   else if (type == GL_UNSIGNED_SHORT) {

      start = MIN2(start, 0xffff);

      end = MIN2(end, 0xffff);

   }

   if (end >= ctx->Array.ArrayObj->_MaxElement) {

      /* the max element is out of bounds of one or more enabled arrays */

      warnCount++;

      if (warnCount < 10) {

         _mesa_warning(ctx, "glDraw[Range]Elements(start %u, end %u, count %d, "

                       "type 0x%x, indices=%p)\n"

                       "\tend is out of bounds (max=%u)  "

                       "Element Buffer %u (size %d)\n"

                       "\tThis should probably be fixed in the application.",

                       start, end, count, type, indices,

                       ctx->Array.ArrayObj->_MaxElement - 1,

                       ctx->Array.ElementArrayBufferObj->Name,

                       (int) ctx->Array.ElementArrayBufferObj->Size);

      }

      if (0)

         dump_element_buffer(ctx, type);

      if (0)

         _mesa_print_arrays(ctx);

#ifdef DEBUG

      /* 'end' was out of bounds, but now let's check the actual array

       * indexes to see if any of them are out of bounds.

       */

      {

         GLuint max = _mesa_max_buffer_index(ctx, count, type, indices,

                                             ctx->Array.ElementArrayBufferObj);

         if (max >= ctx->Array.ArrayObj->_MaxElement) {

            if (warnCount < 10) {

               _mesa_warning(ctx, "glDraw[Range]Elements(start %u, end %u, "

                             "count %d, type 0x%x, indices=%p)\n"

                             "\tindex=%u is out of bounds (max=%u)  "

                             "Element Buffer %u (size %d)\n"

                             "\tSkipping the glDrawRangeElements() call",

                             start, end, count, type, indices, max,

                             ctx->Array.ArrayObj->_MaxElement - 1,

                             ctx->Array.ElementArrayBufferObj->Name,

                             (int) ctx->Array.ElementArrayBufferObj->Size);

            }

         }

         /* XXX we could also find the min index and compare to 'start'

          * to see if start is correct.  But it's more likely to get the

          * upper bound wrong.

          */

      }

#endif

      /* Set 'end' to the max possible legal value */

      assert(ctx->Array.ArrayObj->_MaxElement >= 1);

      end = ctx->Array.ArrayObj->_MaxElement - 1;

   }

   else if (0) {

      printf("glDraw[Range]Elements{,BaseVertex}"

	     "(start %u, end %u, type 0x%x, count %d) ElemBuf %u, "

	     "base %d\n",

	     start, end, type, count,

	     ctx->Array.ElementArrayBufferObj->Name,

	     basevertex);

   }

#if 0

   check_draw_elements_data(ctx, count, type, indices);

#else

   (void) check_draw_elements_data;

#endif

   vbo_validated_drawrangeelements(ctx, mode, GL_TRUE, start, end,

				   count, type, indices, basevertex, 1);

}

/**

 * Called by glDrawRangeElements() in immediate mode.

 */

static void GLAPIENTRY

vbo_exec_DrawRangeElements(GLenum mode, GLuint start, GLuint end,

                           GLsizei count, GLenum type, const GLvoid *indices)

{

   GET_CURRENT_CONTEXT(ctx);

   if (MESA_VERBOSE & VERBOSE_DRAW)

      _mesa_debug(ctx,

                  "glDrawRangeElements(%s, %u, %u, %d, %s, %p)\n",

                  _mesa_lookup_enum_by_nr(mode), start, end, count,

                  _mesa_lookup_enum_by_nr(type), indices);

   vbo_exec_DrawRangeElementsBaseVertex(mode, start, end, count, type,

					indices, 0);

}

/**

 * Called by glDrawElements() in immediate mode.

 */

static void GLAPIENTRY

vbo_exec_DrawElements(GLenum mode, GLsizei count, GLenum type,

                      const GLvoid *indices)

{

   GET_CURRENT_CONTEXT(ctx);

   if (MESA_VERBOSE & VERBOSE_DRAW)

      _mesa_debug(ctx, "glDrawElements(%s, %u, %s, %p)\n",

                  _mesa_lookup_enum_by_nr(mode), count,

                  _mesa_lookup_enum_by_nr(type), indices);

   if (!_mesa_validate_DrawElements( ctx, mode, count, type, indices, 0 ))

      return;

   vbo_validated_drawrangeelements(ctx, mode, GL_FALSE, ~0, ~0,

				   count, type, indices, 0, 1);

}

/**

 * Called by glDrawElementsBaseVertex() in immediate mode.

 */

static void GLAPIENTRY

vbo_exec_DrawElementsBaseVertex(GLenum mode, GLsizei count, GLenum type,

				const GLvoid *indices, GLint basevertex)

{

   GET_CURRENT_CONTEXT(ctx);

   if (MESA_VERBOSE & VERBOSE_DRAW)

      _mesa_debug(ctx, "glDrawElementsBaseVertex(%s, %d, %s, %p, %d)\n",

                  _mesa_lookup_enum_by_nr(mode), count,

                  _mesa_lookup_enum_by_nr(type), indices, basevertex);

   if (!_mesa_validate_DrawElements( ctx, mode, count, type, indices,

				     basevertex ))

      return;

   vbo_validated_drawrangeelements(ctx, mode, GL_FALSE, ~0, ~0,

				   count, type, indices, basevertex, 1);

}

/**

 * Called by glDrawElementsInstanced() in immediate mode.

 */

static void GLAPIENTRY

vbo_exec_DrawElementsInstanced(GLenum mode, GLsizei count, GLenum type,

                               const GLvoid *indices, GLsizei primcount)

{

   GET_CURRENT_CONTEXT(ctx);

   if (MESA_VERBOSE & VERBOSE_DRAW)

      _mesa_debug(ctx, "glDrawElementsInstanced(%s, %d, %s, %p, %d)\n",

                  _mesa_lookup_enum_by_nr(mode), count,

                  _mesa_lookup_enum_by_nr(type), indices, primcount);

   if (!_mesa_validate_DrawElementsInstanced(ctx, mode, count, type, indices,

                                             primcount))

      return;

   vbo_validated_drawrangeelements(ctx, mode, GL_FALSE, ~0, ~0,

				   count, type, indices, 0, primcount);

}

/**

 * Inner support for both _mesa_MultiDrawElements() and

 * _mesa_MultiDrawRangeElements().

 * This does the actual rendering after we've checked array indexes, etc.

 */

static void

vbo_validated_multidrawelements(struct gl_context *ctx, GLenum mode,

				const GLsizei *count, GLenum type,

				const GLvoid **indices, GLsizei primcount,

				const GLint *basevertex)

{

   struct vbo_context *vbo = vbo_context(ctx);

   struct vbo_exec_context *exec = &vbo->exec;

   struct _mesa_index_buffer ib;

   struct _mesa_prim *prim;

   unsigned int index_type_size = 0;

   uintptr_t min_index_ptr, max_index_ptr;

   GLboolean fallback = GL_FALSE;

   int i;

   if (primcount == 0)

      return;

   FLUSH_CURRENT( ctx, 0 );

   if (!_mesa_valid_to_render(ctx, "glMultiDrawElements")) {

      return;

   }

   prim = calloc(1, primcount * sizeof(*prim));

   if (prim == NULL) {

      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glMultiDrawElements");

      return;

   }

   /* Decide if we can do this all as one set of primitives sharing the

    * same index buffer, or if we have to reset the index pointer per

    * primitive.

    */

   bind_arrays( ctx );

   /* check for dirty state again */

   if (ctx->NewState)

      _mesa_update_state( ctx );

   switch (type) {

   case GL_UNSIGNED_INT:

      index_type_size = 4;

      break;

   case GL_UNSIGNED_SHORT:

      index_type_size = 2;

      break;

   case GL_UNSIGNED_BYTE:

      index_type_size = 1;

      break;

   default:

      assert(0);

   }

   min_index_ptr = (uintptr_t)indices[0];

   max_index_ptr = 0;

   for (i = 0; i < primcount; i++) {

      min_index_ptr = MIN2(min_index_ptr, (uintptr_t)indices[i]);

      max_index_ptr = MAX2(max_index_ptr, (uintptr_t)indices[i] +

			   index_type_size * count[i]);

   }

   /* Check if we can handle this thing as a bunch of index offsets from the

    * same index pointer.  If we can't, then we have to fall back to doing

    * a draw_prims per primitive.

    * Check that the difference between each prim's indexes is a multiple of

    * the index/element size.

    */

   if (index_type_size != 1) {

      for (i = 0; i < primcount; i++) {

	 if ((((uintptr_t)indices[i] - min_index_ptr) % index_type_size) != 0) {

	    fallback = GL_TRUE;

	    break;

	 }

      }

   }

   /* If the index buffer isn't in a VBO, then treating the application's

    * subranges of the index buffer as one large index buffer may lead to

    * us reading unmapped memory.

    */

   if (!_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj))

      fallback = GL_TRUE;

   if (!fallback) {

      ib.count = (max_index_ptr - min_index_ptr) / index_type_size;

      ib.type = type;

      ib.obj = ctx->Array.ElementArrayBufferObj;

      ib.ptr = (void *)min_index_ptr;

      for (i = 0; i < primcount; i++) {

	 prim[i].begin = (i == 0);

	 prim[i].end = (i == primcount - 1);

	 prim[i].weak = 0;

	 prim[i].pad = 0;

	 prim[i].mode = mode;

	 prim[i].start = ((uintptr_t)indices[i] - min_index_ptr) / index_type_size;

	 prim[i].count = count[i];

	 prim[i].indexed = 1;

         prim[i].num_instances = 1;

	 if (basevertex != NULL)

	    prim[i].basevertex = basevertex[i];

	 else

	    prim[i].basevertex = 0;

      }

      vbo->draw_prims(ctx, exec->array.inputs, prim, primcount, &ib,

		      GL_FALSE, ~0, ~0);

   } else {

      /* render one prim at a time */

      for (i = 0; i < primcount; i++) {

	 ib.count = count[i];

	 ib.type = type;

	 ib.obj = ctx->Array.ElementArrayBufferObj;

	 ib.ptr = indices[i];

	 prim[0].begin = 1;

	 prim[0].end = 1;

	 prim[0].weak = 0;

	 prim[0].pad = 0;

	 prim[0].mode = mode;

	 prim[0].start = 0;

	 prim[0].count = count[i];

	 prim[0].indexed = 1;

         prim[0].num_instances = 1;

	 if (basevertex != NULL)

	    prim[0].basevertex = basevertex[i];