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Unified Diff: src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp

Issue 896163003: Revert "Move DstCopy on gpu into the GrXferProcessor." (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Fix revert Created 5 years, 10 months ago
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Index: src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp
diff --git a/src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp b/src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp
index 86c622d45686693b8ec25df5a705db14a00b45d8..61932f3084bbd290b301b50a0b1f2cc3ccab4590 100644
--- a/src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp
@@ -179,9 +179,56 @@ const char* GrGLFragmentShaderBuilder::dstColor() {
fbFetchColorName = declared_color_output_name();
}
return fbFetchColorName;
- } else {
+ } else if (fProgramBuilder->fUniformHandles.fDstCopySamplerUni.isValid()) {
return kDstCopyColorName;
- }
+ } else {
+ return "";
+ }
+}
+
+void GrGLFragmentShaderBuilder::emitCodeToReadDstTexture() {
+ bool topDown = SkToBool(kTopLeftOrigin_DstReadKeyBit & fProgramBuilder->header().fDstReadKey);
+ const char* dstCopyTopLeftName;
+ const char* dstCopyCoordScaleName;
+ const char* dstCopySamplerName;
+ uint32_t configMask;
+ if (SkToBool(kUseAlphaConfig_DstReadKeyBit & fProgramBuilder->header().fDstReadKey)) {
+ configMask = kA_GrColorComponentFlag;
+ } else {
+ configMask = kRGBA_GrColorComponentFlags;
+ }
+ fProgramBuilder->fUniformHandles.fDstCopySamplerUni =
+ fProgramBuilder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
+ kSampler2D_GrSLType,
+ kDefault_GrSLPrecision,
+ "DstCopySampler",
+ &dstCopySamplerName);
+ fProgramBuilder->fUniformHandles.fDstCopyTopLeftUni =
+ fProgramBuilder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
+ kVec2f_GrSLType,
+ kDefault_GrSLPrecision,
+ "DstCopyUpperLeft",
+ &dstCopyTopLeftName);
+ fProgramBuilder->fUniformHandles.fDstCopyScaleUni =
+ fProgramBuilder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
+ kVec2f_GrSLType,
+ kDefault_GrSLPrecision,
+ "DstCopyCoordScale",
+ &dstCopyCoordScaleName);
+ const char* fragPos = this->fragmentPosition();
+
+ this->codeAppend("// Read color from copy of the destination.\n");
+ this->codeAppendf("vec2 _dstTexCoord = (%s.xy - %s) * %s;",
+ fragPos, dstCopyTopLeftName, dstCopyCoordScaleName);
+ if (!topDown) {
+ this->codeAppend("_dstTexCoord.y = 1.0 - _dstTexCoord.y;");
+ }
+ this->codeAppendf("vec4 %s = ", GrGLFragmentShaderBuilder::kDstCopyColorName);
+ this->appendTextureLookup(dstCopySamplerName,
+ "_dstTexCoord",
+ configMask,
+ "rgba");
+ this->codeAppend(";");
}
void GrGLFragmentShaderBuilder::enableCustomOutput() {
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