Disable blending when there is an effect that reads the dst and draw state blend is 1,0.
R=robertphillips@google.com
Review URL: https://codereview.chromium.org/15199008
git-svn-id: http://skia.googlecode.com/svn/trunk@9147 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrDrawState.cpp b/src/gpu/GrDrawState.cpp
index 591e157..a3850b0 100644
--- a/src/gpu/GrDrawState.cpp
+++ b/src/gpu/GrDrawState.cpp
@@ -371,6 +371,13 @@
return kCoverageAsAlpha_BlendOptFlag;
}
}
+ if (kOne_GrBlendCoeff == *srcCoeff &&
+ kZero_GrBlendCoeff == *dstCoeff &&
+ this->willEffectReadDstColor()) {
+ // In this case the shader will fully resolve the color, coverage, and dst and we don't
+ // need blending.
+ return kDisableBlend_BlendOptFlag;
+ }
return kNone_BlendOpt;
}
diff --git a/src/gpu/gl/GrGLProgramDesc.cpp b/src/gpu/gl/GrGLProgramDesc.cpp
index 532923a..e8812fa 100644
--- a/src/gpu/gl/GrGLProgramDesc.cpp
+++ b/src/gpu/gl/GrGLProgramDesc.cpp
@@ -178,8 +178,8 @@
desc->fFirstCoverageStage = firstCoverageStage;
}
} else if (readsDst &&
- kOne_GrBlendCoeff == drawState.getSrcBlendCoeff() &&
- kZero_GrBlendCoeff == drawState.getDstBlendCoeff()) {
+ kOne_GrBlendCoeff == srcCoeff &&
+ kZero_GrBlendCoeff == dstCoeff) {
desc->fCoverageOutput = kCombineWithDst_CoverageOutput;
desc->fFirstCoverageStage = firstCoverageStage;
}