Add XferProcessor factory in GrPaint and GrDrawState.
In this CL the XP should have zero effect on the actual rendering pipeline.
BUG=skia:
Review URL: https://codereview.chromium.org/751283002
diff --git a/src/gpu/effects/GrPorterDuffXferProcessor.cpp b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
new file mode 100644
index 0000000..fdbcbbe
--- /dev/null
+++ b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
@@ -0,0 +1,76 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrPorterDuffXferProcessor.h"
+
+#include "GrBackendProcessorFactory.h"
+#include "GrDrawState.h"
+#include "GrInvariantOutput.h"
+#include "GrProcessor.h"
+#include "GrTBackendProcessorFactory.h"
+#include "GrTypes.h"
+#include "GrXferProcessor.h"
+#include "gl/GrGLProcessor.h"
+#include "gl/builders/GrGLFragmentShaderBuilder.h"
+#include "gl/builders/GrGLProgramBuilder.h"
+
+class GrGLPorterDuffXferProcessor : public GrGLXferProcessor {
+public:
+ GrGLPorterDuffXferProcessor(const GrBackendProcessorFactory& factory, const GrProcessor&)
+ : INHERITED(factory) {}
+
+ virtual ~GrGLPorterDuffXferProcessor() {}
+
+ virtual void emitCode(GrGLFPBuilder* builder,
+ const GrFragmentProcessor& fp,
+ const char* outputColor,
+ const char* inputColor,
+ const TransformedCoordsArray& coords,
+ const TextureSamplerArray& samplers) SK_OVERRIDE {
+ GrGLFPFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
+ fsBuilder->codeAppendf("%s = %s;", outputColor, inputColor);
+ }
+
+ virtual void setData(const GrGLProgramDataManager&, const GrProcessor&) SK_OVERRIDE {};
+
+ static void GenKey(const GrProcessor&, const GrGLCaps& caps, GrProcessorKeyBuilder* b) {};
+
+private:
+ typedef GrGLXferProcessor INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+GrPorterDuffXferProcessor::GrPorterDuffXferProcessor(GrBlendCoeff srcBlend, GrBlendCoeff dstBlend)
+ : fSrcBlend(srcBlend), fDstBlend(dstBlend) {}
+
+GrPorterDuffXferProcessor::~GrPorterDuffXferProcessor() {
+}
+
+const GrBackendFragmentProcessorFactory& GrPorterDuffXferProcessor::getFactory() const {
+ return GrTBackendFragmentProcessorFactory<GrPorterDuffXferProcessor>::getInstance();
+}
+
+void GrPorterDuffXferProcessor::onComputeInvariantOutput(GrInvariantOutput* inout) const {
+ inout->setToUnknown(GrInvariantOutput::kWillNot_ReadInput);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+const GrXferProcessor* GrPorterDuffXPFactory::createXferProcessor() const {
+ return GrPorterDuffXferProcessor::Create(fSrc, fDst);
+}
+
+bool GrPorterDuffXPFactory::supportsRGBCoverage(GrColor /*knownColor*/,
+ uint32_t knownColorFlags) const {
+ if (kOne_GrBlendCoeff == fSrc && kISA_GrBlendCoeff == fDst &&
+ kRGBA_GrColorComponentFlags == knownColorFlags) {
+ return true;
+ }
+ return false;
+}
+
diff --git a/src/gpu/effects/GrPorterDuffXferProcessor.h b/src/gpu/effects/GrPorterDuffXferProcessor.h
new file mode 100644
index 0000000..474285d
--- /dev/null
+++ b/src/gpu/effects/GrPorterDuffXferProcessor.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrPorterDuffXferProcessor_DEFINED
+#define GrPorterDuffXferProcessor_DEFINED
+
+#include "GrTypes.h"
+#include "GrXferProcessor.h"
+#include "SkXfermode.h"
+
+class GrBackendFragmentProcessorFactory;
+class GrDrawState;
+class GrGLPorterDuffXferProcessor;
+class GrInvariantOutput;
+
+class GrPorterDuffXferProcessor : public GrXferProcessor {
+public:
+ static GrXferProcessor* Create(GrBlendCoeff srcBlend, GrBlendCoeff dstBlend) {
+ return SkNEW_ARGS(GrPorterDuffXferProcessor, (srcBlend, dstBlend));
+ }
+
+ virtual ~GrPorterDuffXferProcessor();
+
+ virtual const GrBackendFragmentProcessorFactory& getFactory() const SK_OVERRIDE;
+
+ typedef GrGLPorterDuffXferProcessor GLProcessor;
+ static const char* Name() { return "Porter Duff"; }
+
+private:
+ GrPorterDuffXferProcessor(GrBlendCoeff srcBlend, GrBlendCoeff dstBlend);
+
+ virtual bool onIsEqual(const GrFragmentProcessor& fpBase) const SK_OVERRIDE {
+ const GrPorterDuffXferProcessor& xp = fpBase.cast<GrPorterDuffXferProcessor>();
+ if (fSrcBlend != xp.fSrcBlend || fDstBlend != xp.fDstBlend) {
+ return false;
+ }
+ return true;
+ }
+
+ virtual void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE;
+
+ GrBlendCoeff fSrcBlend;
+ GrBlendCoeff fDstBlend;
+
+ typedef GrXferProcessor INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+class GrPorterDuffXPFactory : public GrXPFactory {
+public:
+ static GrXPFactory* Create(SkXfermode::Coeff src, SkXfermode::Coeff dst) {
+ return SkNEW_ARGS(GrPorterDuffXPFactory, ((GrBlendCoeff)(src), (GrBlendCoeff)(dst)));
+ }
+
+ static GrXPFactory* Create(GrBlendCoeff src, GrBlendCoeff dst) {
+ return SkNEW_ARGS(GrPorterDuffXPFactory, (src, dst));
+ }
+
+ const GrXferProcessor* createXferProcessor() const SK_OVERRIDE;
+
+ bool supportsRGBCoverage(GrColor knownColor, uint32_t knownColorFlags) const SK_OVERRIDE;
+
+private:
+ GrPorterDuffXPFactory(GrBlendCoeff src, GrBlendCoeff dst)
+ : fSrc(src), fDst(dst) {}
+
+ GrBlendCoeff fSrc;
+ GrBlendCoeff fDst;
+
+ typedef GrXPFactory INHERITED;
+};
+
+#endif