src/mesa/main/api_validate.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   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 /**
  34  * Find the max index in the given element/index buffer
  35  */
  36 static GLuint
  37 max_buffer_index(GLcontext *ctx, GLuint count, GLenum type,
  38                  const void *indices,
  39                  struct gl_buffer_object *elementBuf)
  40 {
  41    const GLubyte *map = NULL;
  42    GLuint max = 0;
  43    GLint i;
  44
  45    if (elementBuf->Name) {
  46       /* elements are in a user-defined buffer object.  need to map it */
  47       map = ctx->Driver.MapBuffer(ctx,
  48                                   GL_ELEMENT_ARRAY_BUFFER_ARB,
  49                                   GL_READ_ONLY,
  50                                   elementBuf);
  51       /* Actual address is the sum of pointers */
  52       indices = (const GLvoid *) ADD_POINTERS(map, (const GLubyte *) indices);
  53    }
  54
  55    if (type == GL_UNSIGNED_INT) {
  56       for (i = 0; i < count; i++)
  57          if (((GLuint *) indices)[i] > max)
  58             max = ((GLuint *) indices)[i];
  59    }
  60    else if (type == GL_UNSIGNED_SHORT) {
  61       for (i = 0; i < count; i++)
  62          if (((GLushort *) indices)[i] > max)
  63             max = ((GLushort *) indices)[i];
  64    }
  65    else {
  66       ASSERT(type == GL_UNSIGNED_BYTE);
  67       for (i = 0; i < count; i++)
  68          if (((GLubyte *) indices)[i] > max)
  69             max = ((GLubyte *) indices)[i];
  70    }
  71
  72    if (map) {
  73       ctx->Driver.UnmapBuffer(ctx,
  74                               GL_ELEMENT_ARRAY_BUFFER_ARB,
  75                               ctx->Array.ElementArrayBufferObj);
  76    }
  77
  78    return max;
  79 }
  80
  81
  82 GLboolean
  83 _mesa_validate_DrawElements(GLcontext *ctx,
  84                             GLenum mode, GLsizei count, GLenum type,
  85                             const GLvoid *indices)
  86 {
  87    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx,  GL_FALSE);
  88
  89    if (count <= 0) {
  90       if (count < 0)
  91          _mesa_error(ctx, GL_INVALID_VALUE, "glDrawElements(count)" );
  92       return GL_FALSE;
  93    }
  94
  95    if (mode > GL_POLYGON) {
  96       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(mode)" );
  97       return GL_FALSE;
  98    }
  99
 100    if (type != GL_UNSIGNED_INT &&
 101        type != GL_UNSIGNED_BYTE &&
 102        type != GL_UNSIGNED_SHORT)
 103    {
 104       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(type)" );
 105       return GL_FALSE;
 106    }
 107
 108    if (ctx->NewState)
 109       _mesa_update_state(ctx);
 110
 111    /* Always need vertex positions, unless a vertex program is in use */
 112    if (!ctx->VertexProgram._Current &&
 113        !ctx->Array.ArrayObj->Vertex.Enabled &&
 114        !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
 115       return GL_FALSE;
 116
 117    /* Vertex buffer object tests */
 118    if (ctx->Array.ElementArrayBufferObj->Name) {
 119       /* use indices in the buffer object */
 120       GLuint indexBytes;
 121
 122       if (!ctx->Array.ElementArrayBufferObj->Size) {
 123          _mesa_warning(ctx,
 124                        "glDrawElements called with empty array elements buffer");
 125          return GL_FALSE;
 126       }
 127
 128       if (type == GL_UNSIGNED_INT) {
 129          indexBytes = count * sizeof(GLuint);
 130       }
 131       else if (type == GL_UNSIGNED_BYTE) {
 132          indexBytes = count * sizeof(GLubyte);
 133       }
 134       else {
 135          ASSERT(type == GL_UNSIGNED_SHORT);
 136          indexBytes = count * sizeof(GLushort);
 137       }
 138
 139       /* make sure count doesn't go outside buffer bounds */
 140       if (indexBytes > (GLuint) ctx->Array.ElementArrayBufferObj->Size) {
 141          _mesa_warning(ctx, "glDrawElements index out of buffer bounds");
 142          return GL_FALSE;
 143       }
 144    }
 145    else {
 146       /* not using a VBO */
 147       if (!indices)
 148          return GL_FALSE;
 149    }
 150
 151    if (ctx->Const.CheckArrayBounds) {
 152       /* find max array index */
 153       GLuint max = max_buffer_index(ctx, count, type, indices,
 154                                     ctx->Array.ElementArrayBufferObj);
 155       if (max >= ctx->Array._MaxElement) {
 156          /* the max element is out of bounds of one or more enabled arrays */
 157          return GL_FALSE;
 158       }
 159    }
 160
 161    return GL_TRUE;
 162 }
 163
 164
 165 GLboolean
 166 _mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
 167                                  GLuint start, GLuint end,
 168                                  GLsizei count, GLenum type,
 169                                  const GLvoid *indices)
 170 {
 171    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 172
 173    if (count <= 0) {
 174       if (count < 0)
 175          _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(count)" );
 176       return GL_FALSE;
 177    }
 178
 179    if (mode > GL_POLYGON) {
 180       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );
 181       return GL_FALSE;
 182    }
 183
 184    if (end < start) {
 185       _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
 186       return GL_FALSE;
 187    }
 188
 189    if (type != GL_UNSIGNED_INT &&
 190        type != GL_UNSIGNED_BYTE &&
 191        type != GL_UNSIGNED_SHORT) {
 192       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(type)" );
 193       return GL_FALSE;
 194    }
 195
 196    if (ctx->NewState)
 197       _mesa_update_state(ctx);
 198
 199    /* Always need vertex positions, unless a vertex program is in use */
 200    if (!ctx->VertexProgram._Current &&
 201        !ctx->Array.ArrayObj->Vertex.Enabled &&
 202        !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
 203       return GL_FALSE;
 204
 205    /* Vertex buffer object tests */
 206    if (ctx->Array.ElementArrayBufferObj->Name) {
 207       /* use indices in the buffer object */
 208       GLuint indexBytes;
 209
 210       if (type == GL_UNSIGNED_INT) {
 211          indexBytes = count * sizeof(GLuint);
 212       }
 213       else if (type == GL_UNSIGNED_BYTE) {
 214          indexBytes = count * sizeof(GLubyte);
 215       }
 216       else {
 217          ASSERT(type == GL_UNSIGNED_SHORT);
 218          indexBytes = count * sizeof(GLushort);
 219       }
 220
 221       /* make sure count doesn't go outside buffer bounds */
 222       if (indexBytes > ctx->Array.ElementArrayBufferObj->Size) {
 223          _mesa_warning(ctx, "glDrawRangeElements index out of buffer bounds");
 224          return GL_FALSE;
 225       }
 226    }
 227    else {
 228       /* not using a VBO */
 229       if (!indices)
 230          return GL_FALSE;
 231    }
 232
 233    if (ctx->Const.CheckArrayBounds) {
 234       GLuint max = max_buffer_index(ctx, count, type, indices,
 235                                     ctx->Array.ElementArrayBufferObj);
 236       if (max >= ctx->Array._MaxElement) {
 237          /* the max element is out of bounds of one or more enabled arrays */
 238          return GL_FALSE;
 239       }
 240    }
 241
 242    return GL_TRUE;
 243 }
 244
 245
 246 /**
 247  * Called from the tnl module to error check the function parameters and
 248  * verify that we really can draw something.
 249  */
 250 GLboolean
 251 _mesa_validate_DrawArrays(GLcontext *ctx,
 252                           GLenum mode, GLint start, GLsizei count)
 253 {
 254    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 255
 256    if (count <= 0) {
 257       if (count < 0)
 258          _mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" );
 259       return GL_FALSE;
 260    }
 261
 262    if (mode > GL_POLYGON) {
 263       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
 264       return GL_FALSE;
 265    }
 266
 267    if (ctx->NewState)
 268       _mesa_update_state(ctx);
 269
 270    /* Always need vertex positions, unless a vertex program is in use */
 271    if (!ctx->VertexProgram._Current &&
 272        !ctx->Array.ArrayObj->Vertex.Enabled &&
 273        !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
 274       return GL_FALSE;
 275
 276    if (ctx->Const.CheckArrayBounds) {
 277       if (start + count > (GLint) ctx->Array._MaxElement)
 278          return GL_FALSE;
 279    }
 280
 281    return GL_TRUE;
 282 }