Move Gpu ArithmeticMode xfer effect to _gpu files.

src/effects/SkArithmeticMode_gpu.cpp

Index: src/effects/SkArithmeticMode_gpu.cpp
diff --git a/src/effects/SkArithmeticMode_gpu.cpp b/src/effects/SkArithmeticMode_gpu.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6ccd63ba747e17c52177a4d9de5de10f126d953c
--- /dev/null
+++ b/src/effects/SkArithmeticMode_gpu.cpp
@@ -0,0 +1,174 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkArithmeticMode_gpu.h"
+
+#if SK_SUPPORT_GPU
+#include "GrContext.h"
+#include "GrFragmentProcessor.h"
+#include "GrInvariantOutput.h"
+#include "GrProcessor.h"
+#include "GrTexture.h"
+#include "gl/GrGLCaps.h"
+#include "gl/GrGLProcessor.h"
+#include "gl/GrGLProgramDataManager.h"
+#include "gl/builders/GrGLProgramBuilder.h"
+
+static const bool gUseUnpremul = false;
+
+class GLArithmeticFP : public GrGLFragmentProcessor {
+public:
+    GLArithmeticFP(const GrProcessor&);
+    virtual ~GLArithmeticFP();
+
+    virtual void emitCode(GrGLFPBuilder*,
+                          const GrFragmentProcessor&,
+                          const char* outputColor,
+                          const char* inputColor,
+                          const TransformedCoordsArray&,
+                          const TextureSamplerArray&) SK_OVERRIDE;
+
+    virtual void setData(const GrGLProgramDataManager&, const GrProcessor&) SK_OVERRIDE;
+
+    static void GenKey(const GrProcessor&, const GrGLCaps& caps, GrProcessorKeyBuilder* b);
+
+private:
+    GrGLProgramDataManager::UniformHandle fKUni;
+    bool fEnforcePMColor;
+
+    typedef GrGLFragmentProcessor INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+GrArithmeticFP::GrArithmeticFP(float k1, float k2, float k3, float k4,
+                               bool enforcePMColor, GrTexture* background)
+  : fK1(k1), fK2(k2), fK3(k3), fK4(k4), fEnforcePMColor(enforcePMColor) {
+    this->initClassID<GrArithmeticFP>();
+    if (background) {
+        fBackgroundTransform.reset(kLocal_GrCoordSet, background,
+                                   GrTextureParams::kNone_FilterMode);
+        this->addCoordTransform(&fBackgroundTransform);
+        fBackgroundAccess.reset(background);
+        this->addTextureAccess(&fBackgroundAccess);
+    } else {
+        this->setWillReadDstColor();
+    }
+}
+
+void GrArithmeticFP::getGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const {
+    GLArithmeticFP::GenKey(*this, caps, b);
+}
+
+GrGLFragmentProcessor* GrArithmeticFP::createGLInstance() const {
+    return SkNEW_ARGS(GLArithmeticFP, (*this));
+}
+
+bool GrArithmeticFP::onIsEqual(const GrFragmentProcessor& fpBase) const {
+    const GrArithmeticFP& fp = fpBase.cast<GrArithmeticFP>();
+    return fK1 == fp.fK1 &&
+           fK2 == fp.fK2 &&
+           fK3 == fp.fK3 &&
+           fK4 == fp.fK4 &&
+           fEnforcePMColor == fp.fEnforcePMColor;
+}
+
+void GrArithmeticFP::onComputeInvariantOutput(GrInvariantOutput* inout) const {
+    // TODO: optimize this
+    inout->setToUnknown(GrInvariantOutput::kWill_ReadInput);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+GLArithmeticFP::GLArithmeticFP(const GrProcessor&)
+   : fEnforcePMColor(true) {
+}
+
+GLArithmeticFP::~GLArithmeticFP() {
+}
+
+void GLArithmeticFP::emitCode(GrGLFPBuilder* builder,
+                              const GrFragmentProcessor& fp,
+                              const char* outputColor,
+                              const char* inputColor,
+                              const TransformedCoordsArray& coords,
+                              const TextureSamplerArray& samplers) {
+
+    GrTexture* backgroundTex = fp.cast<GrArithmeticFP>().backgroundTexture();
+    GrGLFPFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
+    const char* dstColor;
+    if (backgroundTex) {
+        fsBuilder->codeAppend("\t\tvec4 bgColor = ");
+        fsBuilder->appendTextureLookup(samplers[0], coords[0].c_str(), coords[0].getType());
+        fsBuilder->codeAppendf(";\n");
+        dstColor = "bgColor";
+    } else {
+        dstColor = fsBuilder->dstColor();
+    }
+
+    SkASSERT(dstColor);
+    fKUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
+                                kVec4f_GrSLType, kDefault_GrSLPrecision,
+                                "k");
+    const char* kUni = builder->getUniformCStr(fKUni);
+
+    // We don't try to optimize for this case at all
+    if (NULL == inputColor) {
+        fsBuilder->codeAppendf("\t\tconst vec4 src = vec4(1);\n");
+    } else {
+        fsBuilder->codeAppendf("\t\tvec4 src = %s;\n", inputColor);
+        if (gUseUnpremul) {
+            fsBuilder->codeAppendf("\t\tsrc.rgb = clamp(src.rgb / src.a, 0.0, 1.0);\n");
+        }
+    }
+
+    fsBuilder->codeAppendf("\t\tvec4 dst = %s;\n", dstColor);
+    if (gUseUnpremul) {
+        fsBuilder->codeAppendf("\t\tdst.rgb = clamp(dst.rgb / dst.a, 0.0, 1.0);\n");
+    }
+
+    fsBuilder->codeAppendf("\t\t%s = %s.x * src * dst + %s.y * src + %s.z * dst + %s.w;\n", outputColor, kUni, kUni, kUni, kUni);
+    fsBuilder->codeAppendf("\t\t%s = clamp(%s, 0.0, 1.0);\n", outputColor, outputColor);
+    if (gUseUnpremul) {
+        fsBuilder->codeAppendf("\t\t%s.rgb *= %s.a;\n", outputColor, outputColor);
+    } else if (fEnforcePMColor) {
+        fsBuilder->codeAppendf("\t\t%s.rgb = min(%s.rgb, %s.a);\n", outputColor, outputColor, outputColor);
+    }
+}
+
+void GLArithmeticFP::setData(const GrGLProgramDataManager& pdman, const GrProcessor& processor) {
+    const GrArithmeticFP& arith = processor.cast<GrArithmeticFP>();
+    pdman.set4f(fKUni, arith.k1(), arith.k2(), arith.k3(), arith.k4());
+    fEnforcePMColor = arith.enforcePMColor();
+}
+
+void GLArithmeticFP::GenKey(const GrProcessor& processor, const GrGLCaps&,
+                            GrProcessorKeyBuilder* b) {
+    const GrArithmeticFP& arith = processor.cast<GrArithmeticFP>();
+    uint32_t key = arith.enforcePMColor() ? 1 : 0;
+    if (arith.backgroundTexture()) {
+        key |= 2;
+    }
+    b->add32(key);
+}
+
+GrFragmentProcessor* GrArithmeticFP::TestCreate(SkRandom* rand,
+                                                    GrContext*,
+                                                    const GrDrawTargetCaps&,
+                                                    GrTexture*[]) {
+    float k1 = rand->nextF();
+    float k2 = rand->nextF();
+    float k3 = rand->nextF();
+    float k4 = rand->nextF();
+    bool enforcePMColor = rand->nextBool();
+
+    return SkNEW_ARGS(GrArithmeticFP, (k1, k2, k3, k4, enforcePMColor, NULL));
+}
+
+GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrArithmeticFP);
+
+#endif