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