src/mesa/main/api_validate.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.1
   4  *
   5  * Copyright (C) 1999-2003  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
 104    if (ctx->Const.CheckArrayBounds) {
 105       /* find max array index */
 106       GLuint max = 0;
 107       GLint i;
 108       if (type == GL_UNSIGNED_INT) {
 109          for (i = 0; i < count; i++)
 110             if (((GLuint *) indices)[i] > max)
 111                max = ((GLuint *) indices)[i];
 112       }
 113       else if (type == GL_UNSIGNED_SHORT) {
 114          for (i = 0; i < count; i++)
 115             if (((GLushort *) indices)[i] > max)
 116                max = ((GLushort *) indices)[i];
 117       }
 118       else {
 119          ASSERT(type == GL_UNSIGNED_BYTE);
 120          for (i = 0; i < count; i++)
 121             if (((GLubyte *) indices)[i] > max)
 122                max = ((GLubyte *) indices)[i];
 123       }
 124       if (max >= ctx->Array._MaxElement) {
 125          /* the max element is out of bounds of one or more enabled arrays */
 126          return GL_FALSE;
 127       }
 128    }
 129
 130    return GL_TRUE;
 131 }
 132
 133
 134 GLboolean
 135 _mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
 136                                  GLuint start, GLuint end,
 137                                  GLsizei count, GLenum type,
 138                                  const GLvoid *indices)
 139 {
 140    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 141
 142    if (count <= 0) {
 143       if (count < 0)
 144          _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(count)" );
 145       return GL_FALSE;
 146    }
 147
 148    if (mode > GL_POLYGON) {
 149       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );
 150       return GL_FALSE;
 151    }
 152
 153    if (end < start) {
 154       _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
 155       return GL_FALSE;
 156    }
 157
 158    if (type != GL_UNSIGNED_INT &&
 159        type != GL_UNSIGNED_BYTE &&
 160        type != GL_UNSIGNED_SHORT) {
 161       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(type)" );
 162       return GL_FALSE;
 163    }
 164
 165    if (ctx->NewState)
 166       _mesa_update_state(ctx);
 167
 168    /* Always need vertex positions */
 169    if (!ctx->Array.ArrayObj->Vertex.Enabled
 170        && !(ctx->VertexProgram._Enabled && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
 171       return GL_FALSE;
 172
 173    if (ctx->Const.CheckArrayBounds) {
 174       /* Find max array index.
 175        * We don't trust the user's start and end values.
 176        */
 177       GLuint max = 0;
 178       GLint i;
 179       if (type == GL_UNSIGNED_INT) {
 180          for (i = 0; i < count; i++)
 181             if (((GLuint *) indices)[i] > max)
 182                max = ((GLuint *) indices)[i];
 183       }
 184       else if (type == GL_UNSIGNED_SHORT) {
 185          for (i = 0; i < count; i++)
 186             if (((GLushort *) indices)[i] > max)
 187                max = ((GLushort *) indices)[i];
 188       }
 189       else {
 190          ASSERT(type == GL_UNSIGNED_BYTE);
 191          for (i = 0; i < count; i++)
 192             if (((GLubyte *) indices)[i] > max)
 193                max = ((GLubyte *) indices)[i];
 194       }
 195       if (max >= ctx->Array._MaxElement) {
 196          /* the max element is out of bounds of one or more enabled arrays */
 197          return GL_FALSE;
 198       }
 199    }
 200
 201    return GL_TRUE;
 202 }
 203
 204
 205 /**
 206  * Called from the tnl module to error check the function parameters and
 207  * verify that we really can draw something.
 208  */
 209 GLboolean
 210 _mesa_validate_DrawArrays(GLcontext *ctx,
 211                           GLenum mode, GLint start, GLsizei count)
 212 {
 213    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 214
 215    if (count < 0) {
 216       _mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" );
 217       return GL_FALSE;
 218    }
 219
 220    if (mode > GL_POLYGON) {
 221       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
 222       return GL_FALSE;
 223    }
 224
 225    if (ctx->NewState)
 226       _mesa_update_state(ctx);
 227
 228    /* Always need vertex positions */
 229    if (!ctx->Array.ArrayObj->Vertex.Enabled && !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
 230       return GL_FALSE;
 231
 232    if (ctx->Const.CheckArrayBounds) {
 233       if (start + count > (GLint) ctx->Array._MaxElement)
 234          return GL_FALSE;
 235    }
 236
 237    return GL_TRUE;
 238 }