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intel/i965: Disable SampleAlphaToOne if dual source blending enabled

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From SandyBridge PRM, volume 2 Part 1, section 12.2.3, BLEND_STATE:
DWord 1, Bit 30 (AlphaToOne Enable):
"If Dual Source Blending is enabled, this bit must be disabled"

Note: This is a candidate for stable branches.

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Anuj Phogat 2012-09-21 15:16:38 -07:00
parent 9549e55f11
commit ea0d088727
1 changed files with 11 additions and 2 deletions
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13
src/mesa/drivers/dri/i965/gen6_cc.c
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@ -174,8 +174,17 @@ gen6_upload_blend_state(struct brw_context *brw)
/* _NEW_MULTISAMPLE */
blend[b].blend1.alpha_to_coverage =
ctx->Multisample._Enabled && ctx->Multisample.SampleAlphaToCoverage;
blend[b].blend1.alpha_to_one =
ctx->Multisample._Enabled && ctx->Multisample.SampleAlphaToOne;
/* From SandyBridge PRM, volume 2 Part 1, section 8.2.3, BLEND_STATE:
* DWord 1, Bit 30 (AlphaToOne Enable):
* "If Dual Source Blending is enabled, this bit must be disabled"
*/
if (ctx->Color.Blend[b]._UsesDualSrc)
blend[b].blend1.alpha_to_one = false;
else
blend[b].blend1.alpha_to_one =
ctx->Multisample._Enabled && ctx->Multisample.SampleAlphaToOne;
blend[b].blend1.alpha_to_coverage_dither = (brw->intel.gen >= 7);
}
else {