src/mesa/main/api_validate.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.0.1
   4  *
   5  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 #include "glheader.h"
  26 #include "api_validate.h"
  27 #include "context.h"
  28 #include "imports.h"
  29 #include "mtypes.h"
  30 #include "state.h"
  31
  32
  33 GLboolean
  34 _mesa_validate_DrawElements(GLcontext *ctx,
  35                             GLenum mode, GLsizei count, GLenum type,
  36                             const GLvoid *indices)
  37 {
  38    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx,  GL_FALSE);
  39
  40    if (count <= 0) {
  41       if (count < 0)
  42          _mesa_error(ctx, GL_INVALID_VALUE, "glDrawElements(count)" );
  43       return GL_FALSE;
  44    }
  45
  46    if (mode > GL_POLYGON) {
  47       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(mode)" );
  48       return GL_FALSE;
  49    }
  50
  51    if (type != GL_UNSIGNED_INT &&
  52        type != GL_UNSIGNED_BYTE &&
  53        type != GL_UNSIGNED_SHORT)
  54    {
  55       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(type)" );
  56       return GL_FALSE;
  57    }
  58
  59    if (ctx->NewState)
  60       _mesa_update_state(ctx);
  61
  62    /* Always need vertex positions */
  63    if (!ctx->Array.ArrayObj->Vertex.Enabled
  64        && !(ctx->VertexProgram._Enabled && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
  65       return GL_FALSE;
  66
  67    /* Vertex buffer object tests */
  68    if (ctx->Array.ElementArrayBufferObj->Name) {
  69       GLuint indexBytes;
  70
  71       /* use indices in the buffer object */
  72       if (!ctx->Array.ElementArrayBufferObj->Data) {
  73          _mesa_warning(ctx, "DrawElements with empty vertex elements buffer!");
  74          return GL_FALSE;
  75       }
  76
  77       /* make sure count doesn't go outside buffer bounds */
  78       if (type == GL_UNSIGNED_INT) {
  79          indexBytes = count * sizeof(GLuint);
  80       }
  81       else if (type == GL_UNSIGNED_BYTE) {
  82          indexBytes = count * sizeof(GLubyte);
  83       }
  84       else {
  85          ASSERT(type == GL_UNSIGNED_SHORT);
  86          indexBytes = count * sizeof(GLushort);
  87       }
  88
  89       if ((GLubyte *) indices + indexBytes >
  90           ctx->Array.ElementArrayBufferObj->Data +
  91           ctx->Array.ElementArrayBufferObj->Size) {
  92          _mesa_warning(ctx, "glDrawElements index out of buffer bounds");
  93          return GL_FALSE;
  94       }
  95
  96       /* Actual address is the sum of pointers.  Indices may be used below. */
  97       if (ctx->Const.CheckArrayBounds) {
  98          indices = (const GLvoid *)
  99             ADD_POINTERS(ctx->Array.ElementArrayBufferObj->Data,
 100                          (const GLubyte *) indices);
 101       }
 102    }
 103    else {
 104       /* not using a VBO */
 105       if (!indices)
 106          return GL_FALSE;
 107    }
 108
 109    if (ctx->Const.CheckArrayBounds) {
 110       /* find max array index */
 111       GLuint max = 0;
 112       GLint i;
 113       if (type == GL_UNSIGNED_INT) {
 114          for (i = 0; i < count; i++)
 115             if (((GLuint *) indices)[i] > max)
 116                max = ((GLuint *) indices)[i];
 117       }
 118       else if (type == GL_UNSIGNED_SHORT) {
 119          for (i = 0; i < count; i++)
 120             if (((GLushort *) indices)[i] > max)
 121                max = ((GLushort *) indices)[i];
 122       }
 123       else {
 124          ASSERT(type == GL_UNSIGNED_BYTE);
 125          for (i = 0; i < count; i++)
 126             if (((GLubyte *) indices)[i] > max)
 127                max = ((GLubyte *) indices)[i];
 128       }
 129       if (max >= ctx->Array._MaxElement) {
 130          /* the max element is out of bounds of one or more enabled arrays */
 131          return GL_FALSE;
 132       }
 133    }
 134
 135    return GL_TRUE;
 136 }
 137
 138
 139 GLboolean
 140 _mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
 141                                  GLuint start, GLuint end,
 142                                  GLsizei count, GLenum type,
 143                                  const GLvoid *indices)
 144 {
 145    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 146
 147    if (count <= 0) {
 148       if (count < 0)
 149          _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(count)" );
 150       return GL_FALSE;
 151    }
 152
 153    if (mode > GL_POLYGON) {
 154       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );
 155       return GL_FALSE;
 156    }
 157
 158    if (end < start) {
 159       _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
 160       return GL_FALSE;
 161    }
 162
 163    if (type != GL_UNSIGNED_INT &&
 164        type != GL_UNSIGNED_BYTE &&
 165        type != GL_UNSIGNED_SHORT) {
 166       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(type)" );
 167       return GL_FALSE;
 168    }
 169
 170    if (ctx->NewState)
 171       _mesa_update_state(ctx);
 172
 173    /* Always need vertex positions */
 174    if (!ctx->Array.ArrayObj->Vertex.Enabled
 175        && !(ctx->VertexProgram._Enabled && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
 176       return GL_FALSE;
 177
 178    /* Vertex buffer object tests */
 179    if (ctx->Array.ElementArrayBufferObj->Name) {
 180       /* XXX re-use code from above? */
 181    }
 182    else {
 183       /* not using VBO */
 184       if (!indices)
 185          return GL_FALSE;
 186    }
 187
 188    if (ctx->Const.CheckArrayBounds) {
 189       /* Find max array index.
 190        * We don't trust the user's start and end values.
 191        */
 192       GLuint max = 0;
 193       GLint i;
 194       if (type == GL_UNSIGNED_INT) {
 195          for (i = 0; i < count; i++)
 196             if (((GLuint *) indices)[i] > max)
 197                max = ((GLuint *) indices)[i];
 198       }
 199       else if (type == GL_UNSIGNED_SHORT) {
 200          for (i = 0; i < count; i++)
 201             if (((GLushort *) indices)[i] > max)
 202                max = ((GLushort *) indices)[i];
 203       }
 204       else {
 205          ASSERT(type == GL_UNSIGNED_BYTE);
 206          for (i = 0; i < count; i++)
 207             if (((GLubyte *) indices)[i] > max)
 208                max = ((GLubyte *) indices)[i];
 209       }
 210       if (max >= ctx->Array._MaxElement) {
 211          /* the max element is out of bounds of one or more enabled arrays */
 212          return GL_FALSE;
 213       }
 214    }
 215
 216    return GL_TRUE;
 217 }
 218
 219
 220 /**
 221  * Called from the tnl module to error check the function parameters and
 222  * verify that we really can draw something.
 223  */
 224 GLboolean
 225 _mesa_validate_DrawArrays(GLcontext *ctx,
 226                           GLenum mode, GLint start, GLsizei count)
 227 {
 228    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 229
 230    if (count < 0) {
 231       _mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" );
 232       return GL_FALSE;
 233    }
 234
 235    if (mode > GL_POLYGON) {
 236       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
 237       return GL_FALSE;
 238    }
 239
 240    if (ctx->NewState)
 241       _mesa_update_state(ctx);
 242
 243    /* Always need vertex positions */
 244    if (!ctx->Array.ArrayObj->Vertex.Enabled && !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
 245       return GL_FALSE;
 246
 247    if (ctx->Const.CheckArrayBounds) {
 248       if (start + count > (GLint) ctx->Array._MaxElement)
 249          return GL_FALSE;
 250    }
 251
 252    return GL_TRUE;
 253 }