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vbo: clamp DrawElements start/end to max possible values

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Some apps are sloppy with their start/end values.  Clamp them to
max possible values to prevent problems later.
This commit is contained in:
Brian Paul 2010-01-26 12:47:51 -07:00
parent af1e9403e7
commit 645e297a00
1 changed files with 10 additions and 0 deletions
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10
src/mesa/vbo/vbo_exec_array.c
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@ -688,6 +688,16 @@ vbo_exec_DrawRangeElementsBaseVertex(GLenum mode,
* or we can read/write out of memory in several different places!
*/
/* Catch/fix some potential user errors */
if (type == GL_UNSIGNED_BYTE) {
start = MIN2(start, 0xff);
end = MIN2(end, 0xff);
}
else if (type == GL_UNSIGNED_SHORT) {
start = MIN2(start, 0xffff);
end = MIN2(end, 0xffff);
}
if (end >= ctx->Array.ArrayObj->_MaxElement) {
/* the max element is out of bounds of one or more enabled arrays */
warnCount++;