Added --deepColor option to SampleApp, triggers creation of a ten-bit/channel buffer on Windows.

src/gpu/effects/GrColorSpaceEffect.cpp

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrColorSpaceEffect.h"
+
+#include "GrContext.h"
+#include "GrCoordTransform.h"
+#include "GrFragmentProcessor.h"
+#include "GrInvariantOutput.h"
+#include "GrProcessor.h"
+#include "SkColorSpace.h"
+#include "glsl/GrGLSLFragmentProcessor.h"
+#include "glsl/GrGLSLFragmentShaderBuilder.h"
+
+class GrGLColorSpaceEffect : public GrGLSLFragmentProcessor {
+public:
+    void emitCode(EmitArgs& args) override {
+        const GrColorSpaceEffect& cse = args.fFp.cast<GrColorSpaceEffect>();
+        GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
+        GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
+
+        const char* gammaUniName = nullptr;
+        if (cse.manualDstGamma() && !cse.gammaIsSRGB()) {
+            fGammaUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kVec3f_GrSLType,
+                                                   kDefault_GrSLPrecision, "Gamma", &gammaUniName);
+        }
+
+        GrGLSLShaderVar tmpVar("tmpColor", kVec4f_GrSLType, 0, kHigh_GrSLPrecision);
+        SkString tmpDecl;
+        tmpVar.appendDecl(args.fGLSLCaps, &tmpDecl);
+
+        if (cse.manualDstGamma()) {
+            SkString srgbFuncName;
+            if (cse.gammaIsSRGB()) {
+                static const GrGLSLShaderVar gSrgbArgs[] = {
+                    GrGLSLShaderVar("x", kFloat_GrSLType),
+                };
+
+                fragBuilder->emitFunction(kFloat_GrSLType,
+                                          "linear_to_srgb",
+                                          SK_ARRAY_COUNT(gSrgbArgs),
+                                          gSrgbArgs,
+                                          "return (x <= 0.0031308f) ? (x * 12.92f) "
+                                          ": (1.055f * pow(x, 0.416666667f) - 0.055f);",
+                                          &srgbFuncName);
+            }
+
+            fragBuilder->codeAppendf("%s;", tmpDecl.c_str());
+
+            fragBuilder->codeAppendf("%s = ", tmpVar.c_str());
+            fragBuilder->appendTextureLookup(args.fTexSamplers[0], args.fCoords[0].c_str(),
+                                                args.fCoords[0].getType());
+            fragBuilder->codeAppend(";");
+
+            if (cse.gammaIsSRGB()) {
+                fragBuilder->codeAppendf("%s = vec4(%s(%s.r), %s(%s.g), %s(%s.b), %s.a);",
+                                         args.fOutputColor,
+                                         srgbFuncName.c_str(), tmpVar.c_str(),
+                                         srgbFuncName.c_str(), tmpVar.c_str(),
+                                         srgbFuncName.c_str(), tmpVar.c_str(),
+                                         tmpVar.c_str());
+            } else {
+                fragBuilder->codeAppendf("%s = vec4(pow(%s.rgb, %s.rgb), %s.a);",
+                                         args.fOutputColor, tmpVar.c_str(), gammaUniName,
+                                         tmpVar.c_str());
+            }
+        } else {
+            // Pass-through case:
+            fragBuilder->codeAppendf("%s = %s;", args.fOutputColor, tmpVar.c_str());
+        }
+    }
+
+    void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor& proc) {
+        const GrColorSpaceEffect& cse = proc.cast<GrColorSpaceEffect>();
+        if (cse.manualDstGamma() && !cse.gammaIsSRGB()) {
+            SkFloat3 gamma = cse.gamma();
+            pdman.set3fv(fGammaUni, 1, &gamma.fVec[0]);
+        }
+    }
+
+    static inline void GenKey(const GrProcessor& processor, const GrGLSLCaps&,
+                              GrProcessorKeyBuilder* b) {
+        const GrColorSpaceEffect& cse = processor.cast<GrColorSpaceEffect>();
+        uint32_t key = cse.manualDstGamma() ? 0x1 : 0x0;
+        key |= cse.gammaIsSRGB() << 1;
+        b->add32(key);
+    }
+
+private:
+    GrGLSLProgramDataManager::UniformHandle fGammaUni;
+
+    typedef GrGLSLFragmentProcessor INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+static inline float invert_gamma(float x) {
+    // TODO: What's the deal with kDevice_Named? (It has gamma == 0).
+    return SkScalarNearlyZero(x) ? 1.0f : (1.0f / x);
+}
+
+GrColorSpaceEffect::GrColorSpaceEffect(GrTexture* texture,
+                                       const SkColorSpace* srcColorSpace,
+                                       const SkColorSpace* dstColorSpace,
+                                       uint32_t colorSpaceOpsFlags)
+    : INHERITED(texture, GrCoordTransform::MakeDivByTextureWHMatrix(texture))
+    , fManualDstGamma(SkToBool(colorSpaceOpsFlags & GrContext::kManualDstGamma_ColorSpaceOpsFlag)) {
+    this->initClassID<GrColorSpaceEffect>();
+
+    fGamma = dstColorSpace->gamma();
+
+    // TODO: Add an isSRGB (or isSRGBGamma) on SkColorSpace
+    fGammaIsSRGB =
+        SkScalarNearlyEqual(fGamma.fVec[0], 2.2f) &&
+        SkScalarNearlyEqual(fGamma.fVec[1], 2.2f) &&
+        SkScalarNearlyEqual(fGamma.fVec[2], 2.2f);
+
+    // Store inverse destination gamma, for use in shader
+    fGamma.fVec[0] = invert_gamma(fGamma.fVec[0]);
+    fGamma.fVec[1] = invert_gamma(fGamma.fVec[1]);
+    fGamma.fVec[2] = invert_gamma(fGamma.fVec[2]);
+
+    // TODO: Actually read out the color matrices, do the concat, inject that in the shader
+    SkASSERT(srcColorSpace == dstColorSpace);
+}
+
+bool GrColorSpaceEffect::onIsEqual(const GrFragmentProcessor& s) const {
+    const GrColorSpaceEffect& other = s.cast<GrColorSpaceEffect>();
+    // Conservative implemenation. Gamma doesn't matter if manual-gamma flag isn't set.
+    return
+        other.fManualDstGamma == fManualDstGamma &&
+        other.fGammaIsSRGB == fGammaIsSRGB &&
+        other.fGamma.fVec[0] == fGamma.fVec[0] &&
+        other.fGamma.fVec[1] == fGamma.fVec[1] &&
+        other.fGamma.fVec[2] == fGamma.fVec[2];
+}
+
+void GrColorSpaceEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const {
+    inout->setToUnknown(GrInvariantOutput::kWill_ReadInput);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrColorSpaceEffect);
+
+const GrFragmentProcessor* GrColorSpaceEffect::TestCreate(GrProcessorTestData* d) {
+    sk_sp<SkColorSpace> srgb = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
+    bool doManualGamma = d->fRandom->nextBool();
+    uint32_t opsFlags = doManualGamma ? GrContext::kManualDstGamma_ColorSpaceOpsFlag : 0;
+    return new GrColorSpaceEffect(d->fTextures[GrProcessorUnitTest::kSkiaPMTextureIdx],
+                                  srgb.get(), srgb.get(), opsFlags);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+void GrColorSpaceEffect::onGetGLSLProcessorKey(const GrGLSLCaps& caps,
+                                               GrProcessorKeyBuilder* b) const {
+    GrGLColorSpaceEffect::GenKey(*this, caps, b);
+}
+
+GrGLSLFragmentProcessor* GrColorSpaceEffect::onCreateGLSLInstance() const {
+    return new GrGLColorSpaceEffect();
+}
+
+const GrFragmentProcessor* GrColorSpaceEffect::Create(GrTexture* texture,
+                                                      const SkColorSpace* srcColorSpace,
+                                                      const SkColorSpace* dstColorSpace,
+                                                      uint32_t colorSpaceOpsFlags) {
+    return new GrColorSpaceEffect(texture, srcColorSpace, dstColorSpace, colorSpaceOpsFlags);
+}