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i965/gen6: Fix segfault in prepare_blend_state()

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Don't dereference the color buffer if one isn't attached.

This fixes the following Piglit tests in my experimental HiZ branch:
    glean/logicOp
    glean/paths

Note: This is a candidate for the stable branches.
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Chad Versace <chad@chad-versace.us>
This commit is contained in:
Chad Versace 2011-10-08 20:00:50 -07:00
parent 8c7c589c4e
commit b48e02383e
1 changed files with 1 additions and 1 deletions
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src/mesa/drivers/dri/i965/gen6_cc.c
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@ -64,7 +64,7 @@ prepare_blend_state(struct brw_context *brw)
/* Floating point RTs should have no effect from LogicOp,
* except for disabling of blending
*/
if (_mesa_get_format_datatype(rb->Format) != GL_FLOAT) {
if (rb && _mesa_get_format_datatype(rb->Format) != GL_FLOAT) {
blend[b].blend1.logic_op_enable = 1;
blend[b].blend1.logic_op_func =
intel_translate_logic_op(ctx->Color.LogicOp);