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    GLboolean mapped = GL_FALSE;
  39    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx,  GL_FALSE);
  40
  41    if (count <= 0) {
  42       if (count < 0)
  43          _mesa_error(ctx, GL_INVALID_VALUE, "glDrawElements(count)" );
  44       return GL_FALSE;
  45    }
  46
  47    if (mode > GL_POLYGON) {
  48       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(mode)" );
  49       return GL_FALSE;
  50    }
  51
  52    if (type != GL_UNSIGNED_INT &&
  53        type != GL_UNSIGNED_BYTE &&
  54        type != GL_UNSIGNED_SHORT)
  55    {
  56       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(type)" );
  57       return GL_FALSE;
  58    }
  59
  60    if (ctx->NewState)
  61       _mesa_update_state(ctx);
  62
  63    /* Always need vertex positions */
  64    if (!ctx->Array.ArrayObj->Vertex.Enabled
  65        && !(ctx->VertexProgram._Enabled && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
  66       return GL_FALSE;
  67
  68    /* Vertex buffer object tests */
  69    if (ctx->Array.ElementArrayBufferObj->Name) {
  70       GLuint indexBytes;
  71       const GLvoid *map = ctx->Driver.MapBuffer(ctx,
  72                                                 GL_ELEMENT_ARRAY_BUFFER_ARB,
  73                                                 GL_READ_ONLY,
  74                                                 ctx->Array.ElementArrayBufferObj);
  75
  76       /* use indices in the buffer object */
  77       if (!map) {
  78          _mesa_warning(ctx, "DrawElements with empty vertex elements buffer!");
  79          return GL_FALSE;
  80       }
  81
  82       mapped = GL_TRUE;
  83
  84       /* make sure count doesn't go outside buffer bounds */
  85       if (type == GL_UNSIGNED_INT) {
  86          indexBytes = count * sizeof(GLuint);
  87       }
  88       else if (type == GL_UNSIGNED_BYTE) {
  89          indexBytes = count * sizeof(GLubyte);
  90       }
  91       else {
  92          ASSERT(type == GL_UNSIGNED_SHORT);
  93          indexBytes = count * sizeof(GLushort);
  94       }
  95
  96       if (ADD_POINTERS(map, indices) + indexBytes >
  97           (GLubyte *)map + ctx->Array.ElementArrayBufferObj->Size) {
  98          _mesa_warning(ctx, "glDrawElements index out of buffer bounds");
  99          ctx->Driver.UnmapBuffer(ctx,
 100                                  GL_ELEMENT_ARRAY_BUFFER_ARB,
 101                                  ctx->Array.ElementArrayBufferObj);
 102          return GL_FALSE;
 103       }
 104
 105       /* Actual address is the sum of pointers.  Indices may be used below. */
 106       if (ctx->Const.CheckArrayBounds) {
 107          indices = ADD_POINTERS(map, indices);
 108       }
 109    }
 110    else {
 111       /* not using a VBO */
 112       if (!indices)
 113          return GL_FALSE;
 114    }
 115
 116    if (ctx->Const.CheckArrayBounds) {
 117       /* find max array index */
 118       GLuint max = 0;
 119       GLint i;
 120       if (type == GL_UNSIGNED_INT) {
 121          for (i = 0; i < count; i++)
 122             if (((GLuint *) indices)[i] > max)
 123                max = ((GLuint *) indices)[i];
 124       }
 125       else if (type == GL_UNSIGNED_SHORT) {
 126          for (i = 0; i < count; i++)
 127             if (((GLushort *) indices)[i] > max)
 128                max = ((GLushort *) indices)[i];
 129       }
 130       else {
 131          ASSERT(type == GL_UNSIGNED_BYTE);
 132          for (i = 0; i < count; i++)
 133             if (((GLubyte *) indices)[i] > max)
 134                max = ((GLubyte *) indices)[i];
 135       }
 136
 137       if (max >= ctx->Array._MaxElement) {
 138          /* the max element is out of bounds of one or more enabled arrays */
 139          if (mapped) {
 140             ctx->Driver.UnmapBuffer(ctx,
 141                                     GL_ELEMENT_ARRAY_BUFFER_ARB,
 142                                     ctx->Array.ElementArrayBufferObj);
 143          }
 144
 145          return GL_FALSE;
 146       }
 147    }
 148
 149    if (mapped) {
 150       ctx->Driver.UnmapBuffer(ctx,
 151                               GL_ELEMENT_ARRAY_BUFFER_ARB,
 152                               ctx->Array.ElementArrayBufferObj);
 153    }
 154
 155    return GL_TRUE;
 156 }
 157
 158
 159 GLboolean
 160 _mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
 161                                  GLuint start, GLuint end,
 162                                  GLsizei count, GLenum type,
 163                                  const GLvoid *indices)
 164 {
 165    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 166
 167    if (count <= 0) {
 168       if (count < 0)
 169          _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(count)" );
 170       return GL_FALSE;
 171    }
 172
 173    if (mode > GL_POLYGON) {
 174       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );
 175       return GL_FALSE;
 176    }
 177
 178    if (end < start) {
 179       _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
 180       return GL_FALSE;
 181    }
 182
 183    if (type != GL_UNSIGNED_INT &&
 184        type != GL_UNSIGNED_BYTE &&
 185        type != GL_UNSIGNED_SHORT) {
 186       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(type)" );
 187       return GL_FALSE;
 188    }
 189
 190    if (ctx->NewState)
 191       _mesa_update_state(ctx);
 192
 193    /* Always need vertex positions */
 194    if (!ctx->Array.ArrayObj->Vertex.Enabled
 195        && !(ctx->VertexProgram._Enabled && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
 196       return GL_FALSE;
 197
 198    /* Vertex buffer object tests */
 199    if (ctx->Array.ElementArrayBufferObj->Name) {
 200       /* XXX re-use code from above? */
 201    }
 202    else {
 203       /* not using VBO */
 204       if (!indices)
 205          return GL_FALSE;
 206    }
 207
 208    if (ctx->Const.CheckArrayBounds) {
 209       /* Find max array index.
 210        * We don't trust the user's start and end values.
 211        */
 212       GLuint max = 0;
 213       GLint i;
 214       if (type == GL_UNSIGNED_INT) {
 215          for (i = 0; i < count; i++)
 216             if (((GLuint *) indices)[i] > max)
 217                max = ((GLuint *) indices)[i];
 218       }
 219       else if (type == GL_UNSIGNED_SHORT) {
 220          for (i = 0; i < count; i++)
 221             if (((GLushort *) indices)[i] > max)
 222                max = ((GLushort *) indices)[i];
 223       }
 224       else {
 225          ASSERT(type == GL_UNSIGNED_BYTE);
 226          for (i = 0; i < count; i++)
 227             if (((GLubyte *) indices)[i] > max)
 228                max = ((GLubyte *) indices)[i];
 229       }
 230       if (max >= ctx->Array._MaxElement) {
 231          /* the max element is out of bounds of one or more enabled arrays */
 232          return GL_FALSE;
 233       }
 234    }
 235
 236    return GL_TRUE;
 237 }
 238
 239
 240 /**
 241  * Called from the tnl module to error check the function parameters and
 242  * verify that we really can draw something.
 243  */
 244 GLboolean
 245 _mesa_validate_DrawArrays(GLcontext *ctx,
 246                           GLenum mode, GLint start, GLsizei count)
 247 {
 248    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 249
 250    if (count < 0) {
 251       _mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" );
 252       return GL_FALSE;
 253    }
 254
 255    if (mode > GL_POLYGON) {
 256       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
 257       return GL_FALSE;
 258    }
 259
 260    if (ctx->NewState)
 261       _mesa_update_state(ctx);
 262
 263    /* Always need vertex positions */
 264    if (!ctx->Array.ArrayObj->Vertex.Enabled && !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
 265       return GL_FALSE;
 266
 267    if (ctx->Const.CheckArrayBounds) {
 268       if (start + count > (GLint) ctx->Array._MaxElement)
 269          return GL_FALSE;
 270    }
 271
 272    return GL_TRUE;
 273 }