src/mesa/main/api_validate.c

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  5.1
   5  *
   6  * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #include "glheader.h"
  27 #include "api_validate.h"
  28 #include "context.h"
  29 #include "imports.h"
  30 #include "mtypes.h"
  31 #include "state.h"
  32
  33
  34 GLboolean
  35 _mesa_validate_DrawElements(GLcontext *ctx,
  36                             GLenum mode, GLsizei count, GLenum type,
  37                             const GLvoid *indices)
  38 {
  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.Vertex.Enabled
  65        && !(ctx->VertexProgram.Enabled && ctx->Array.VertexAttrib[0].Enabled))
  66       return GL_FALSE;
  67
  68    /* Vertex buffer object tests */
  69    if (ctx->Array.ElementArrayBufferObj->Name) {
  70       GLuint indexBytes;
  71
  72       /* use indices in the buffer object */
  73       if (!ctx->Array.ElementArrayBufferObj->Data) {
  74          _mesa_warning(ctx, "DrawElements with empty vertex elements buffer!");
  75          return GL_FALSE;
  76       }
  77
  78       /* make sure count doesn't go outside buffer bounds */
  79       if (type == GL_UNSIGNED_INT) {
  80          indexBytes = count * sizeof(GLuint);
  81       }
  82       else if (type == GL_UNSIGNED_BYTE) {
  83          indexBytes = count * sizeof(GLubyte);
  84       }
  85       else {
  86          ASSERT(type == GL_UNSIGNED_SHORT);
  87          indexBytes = count * sizeof(GLushort);
  88       }
  89
  90       if ((GLubyte *) indices + indexBytes >
  91           ctx->Array.ElementArrayBufferObj->Data +
  92           ctx->Array.ElementArrayBufferObj->Size) {
  93          _mesa_warning(ctx, "glDrawElements index out of buffer bounds");
  94          return GL_FALSE;
  95       }
  96
  97       /* Actual address is the sum of pointers.  Indices may be used below. */
  98       if (ctx->Const.CheckArrayBounds) {
  99          indices = (const GLvoid *)
 100             ADD_POINTERS(ctx->Array.ElementArrayBufferObj->Data,
 101                          (const GLubyte *) indices);
 102       }
 103    }
 104
 105    if (ctx->Const.CheckArrayBounds) {
 106       /* find max array index */
 107       GLuint max = 0;
 108       GLint i;
 109       if (type == GL_UNSIGNED_INT) {
 110          for (i = 0; i < count; i++)
 111             if (((GLuint *) indices)[i] > max)
 112                max = ((GLuint *) indices)[i];
 113       }
 114       else if (type == GL_UNSIGNED_SHORT) {
 115          for (i = 0; i < count; i++)
 116             if (((GLushort *) indices)[i] > max)
 117                max = ((GLushort *) indices)[i];
 118       }
 119       else {
 120          ASSERT(type == GL_UNSIGNED_BYTE);
 121          for (i = 0; i < count; i++)
 122             if (((GLubyte *) indices)[i] > max)
 123                max = ((GLubyte *) indices)[i];
 124       }
 125       if (max >= ctx->Array._MaxElement) {
 126          /* the max element is out of bounds of one or more enabled arrays */
 127          return GL_FALSE;
 128       }
 129    }
 130
 131    return GL_TRUE;
 132 }
 133
 134
 135 GLboolean
 136 _mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
 137                                  GLuint start, GLuint end,
 138                                  GLsizei count, GLenum type,
 139                                  const GLvoid *indices)
 140 {
 141    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 142
 143    if (count <= 0) {
 144       if (count < 0)
 145          _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(count)" );
 146       return GL_FALSE;
 147    }
 148
 149    if (mode > GL_POLYGON) {
 150       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );
 151       return GL_FALSE;
 152    }
 153
 154    if (end < start) {
 155       _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
 156       return GL_FALSE;
 157    }
 158
 159    if (type != GL_UNSIGNED_INT &&
 160        type != GL_UNSIGNED_BYTE &&
 161        type != GL_UNSIGNED_SHORT) {
 162       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(type)" );
 163       return GL_FALSE;
 164    }
 165
 166    if (ctx->NewState)
 167       _mesa_update_state(ctx);
 168
 169    /* Always need vertex positions */
 170    if (!ctx->Array.Vertex.Enabled
 171        && !(ctx->VertexProgram.Enabled && ctx->Array.VertexAttrib[0].Enabled))
 172       return GL_FALSE;
 173
 174    if (ctx->Const.CheckArrayBounds) {
 175       /* Find max array index.
 176        * We don't trust the user's start and end values.
 177        */
 178       GLuint max = 0;
 179       GLint i;
 180       if (type == GL_UNSIGNED_INT) {
 181          for (i = 0; i < count; i++)
 182             if (((GLuint *) indices)[i] > max)
 183                max = ((GLuint *) indices)[i];
 184       }
 185       else if (type == GL_UNSIGNED_SHORT) {
 186          for (i = 0; i < count; i++)
 187             if (((GLushort *) indices)[i] > max)
 188                max = ((GLushort *) indices)[i];
 189       }
 190       else {
 191          ASSERT(type == GL_UNSIGNED_BYTE);
 192          for (i = 0; i < count; i++)
 193             if (((GLubyte *) indices)[i] > max)
 194                max = ((GLubyte *) indices)[i];
 195       }
 196       if (max >= ctx->Array._MaxElement) {
 197          /* the max element is out of bounds of one or more enabled arrays */
 198          return GL_FALSE;
 199       }
 200    }
 201
 202    return GL_TRUE;
 203 }
 204
 205
 206 /**
 207  * Called from the tnl module to error check the function parameters and
 208  * verify that we really can draw something.
 209  */
 210 GLboolean
 211 _mesa_validate_DrawArrays(GLcontext *ctx,
 212                           GLenum mode, GLint start, GLsizei count)
 213 {
 214    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 215
 216    if (count < 0) {
 217       _mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" );
 218       return GL_FALSE;
 219    }
 220
 221    if (mode > GL_POLYGON) {
 222       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
 223       return GL_FALSE;
 224    }
 225
 226    if (ctx->NewState)
 227       _mesa_update_state(ctx);
 228
 229    /* Always need vertex positions */
 230    if (!ctx->Array.Vertex.Enabled && !ctx->Array.VertexAttrib[0].Enabled)
 231       return GL_FALSE;
 232
 233    if (ctx->Const.CheckArrayBounds) {
 234       if (start + count > (GLint) ctx->Array._MaxElement)
 235          return GL_FALSE;
 236    }
 237
 238    return GL_TRUE;
 239 }