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mesa: fix assertion in _mesa_drawbuffers()

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Fixes failed assertion when _mesa_update_draw_buffers() was called
with GL_DRAW_BUFFER == GL_FRONT_AND_BACK.  The piglit gl30basic hit
this.

Cc: "10.2" <mesa-stable@lists.freedesktop.org>

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Brian Paul 2014-08-08 15:01:50 -06:00
parent dd8f15a553
commit 39b40ad144
1 changed files with 3 additions and 2 deletions
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5
src/mesa/main/buffers.c
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@ -494,10 +494,11 @@ _mesa_drawbuffers(struct gl_context *ctx, GLuint n, const GLenum *buffers,
}
/*
* If n==1, destMask[0] may have up to four bits set.
* destMask[0] may have up to four bits set
* (ex: glDrawBuffer(GL_FRONT_AND_BACK)).
* Otherwise, destMask[x] can only have one bit set.
*/
if (n == 1) {
if (_mesa_bitcount(destMask[0]) > 1) {
GLuint count = 0, destMask0 = destMask[0];
while (destMask0) {
GLint bufIndex = ffs(destMask0) - 1;