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OpenGL2: Fix world VAO cache drawing when glIndex_t is unsigned short

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OpenGL ES is only required to support unsigned short for element buffer
values.

R_DrawElements() firstIndex argument was glIndex_t which caused element
indexes to wrap around to 0 when glIndex_t is an unsigned short.
(glIndex_t is an index into the vertexes buffer, not element buffer.)
Change it to 'int' like tess.firstIndex which is passed to
R_DrawElements().

World VAO cache buffer size allowed storing more vertexes than unsigned
short glIndex_t could reference. This resulted in the vertex indexes in
the element buffer wrapping around to 0.
This commit is contained in:
Zack Middleton 2018-07-20 23:40:31 -05:00
parent 658165cfbb
commit 14cc4cc6cb
3 changed files with 7 additions and 2 deletions
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2
code/renderergl2/tr_shade.c
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@ -38,7 +38,7 @@ R_DrawElements
==================
*/
void R_DrawElements( int numIndexes, glIndex_t firstIndex)
void R_DrawElements( int numIndexes, int firstIndex )
{
qglDrawElements(GL_TRIANGLES, numIndexes, GL_INDEX_TYPE, BUFFER_OFFSET(firstIndex * sizeof(glIndex_t)));
}