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Unified Diff: src/gpu/effects/GrGammaEffect.cpp

Issue 1919993002: Added --deepColor option to SampleApp, triggers creation of a ten-bit/channel buffer on Windows. (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Rebase Created 4 years, 7 months ago
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Index: src/gpu/effects/GrGammaEffect.cpp
diff --git a/src/gpu/effects/GrGammaEffect.cpp b/src/gpu/effects/GrGammaEffect.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..b2aa48aad2dcee5c772d419c99863886a2c3ebdf
--- /dev/null
+++ b/src/gpu/effects/GrGammaEffect.cpp
@@ -0,0 +1,136 @@
+/*
+ * 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 "GrGammaEffect.h"
+
+#include "GrContext.h"
+#include "GrCoordTransform.h"
+#include "GrFragmentProcessor.h"
+#include "GrInvariantOutput.h"
+#include "GrProcessor.h"
+#include "glsl/GrGLSLFragmentProcessor.h"
+#include "glsl/GrGLSLFragmentShaderBuilder.h"
+
+class GrGLGammaEffect : public GrGLSLFragmentProcessor {
+public:
+ void emitCode(EmitArgs& args) override {
+ const GrGammaEffect& ge = args.fFp.cast<GrGammaEffect>();
+ GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
+ GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
+
+ const char* gammaUniName = nullptr;
+ if (!ge.gammaIsSRGB()) {
+ fGammaUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kFloat_GrSLType,
+ kDefault_GrSLPrecision, "Gamma", &gammaUniName);
+ }
+
+ GrGLSLShaderVar tmpVar("tmpColor", kVec4f_GrSLType, 0, kHigh_GrSLPrecision);
+ SkString tmpDecl;
+ tmpVar.appendDecl(args.fGLSLCaps, &tmpDecl);
+
+ SkString srgbFuncName;
+ if (ge.gammaIsSRGB()) {
+ static const GrGLSLShaderVar gSrgbArgs[] = {
+ GrGLSLShaderVar("x", kFloat_GrSLType),
+ };
+
+ fragBuilder->emitFunction(kFloat_GrSLType,
+ "linear_to_srgb",
+ SK_ARRAY_COUNT(gSrgbArgs),
+ gSrgbArgs,
+ "return (x <= 0.0031308) ? (x * 12.92) "
+ ": (1.055 * pow(x, 0.416666667) - 0.055);",
+ &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 (ge.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, vec3(%s)), %s.a);",
+ args.fOutputColor, tmpVar.c_str(), gammaUniName,
+ tmpVar.c_str());
+ }
+ }
+
+ void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor& proc) override {
+ const GrGammaEffect& ge = proc.cast<GrGammaEffect>();
+ if (!ge.gammaIsSRGB()) {
+ pdman.set1f(fGammaUni, ge.gamma());
+ }
+ }
+
+ static inline void GenKey(const GrProcessor& processor, const GrGLSLCaps&,
+ GrProcessorKeyBuilder* b) {
+ const GrGammaEffect& ge = processor.cast<GrGammaEffect>();
+ uint32_t key = ge.gammaIsSRGB() ? 0x1 : 0x0;
+ b->add32(key);
+ }
+
+private:
+ GrGLSLProgramDataManager::UniformHandle fGammaUni;
+
+ typedef GrGLSLFragmentProcessor INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+GrGammaEffect::GrGammaEffect(GrTexture* texture, SkScalar gamma)
+ : INHERITED(texture, GrCoordTransform::MakeDivByTextureWHMatrix(texture)) {
+ this->initClassID<GrGammaEffect>();
+
+ fGamma = gamma;
+ fGammaIsSRGB = SkScalarNearlyEqual(gamma, 1.0f / 2.2f);
+}
+
+bool GrGammaEffect::onIsEqual(const GrFragmentProcessor& s) const {
+ const GrGammaEffect& other = s.cast<GrGammaEffect>();
+ return
+ other.fGammaIsSRGB == fGammaIsSRGB &&
+ other.fGamma == fGamma;
+}
+
+void GrGammaEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const {
+ inout->setToUnknown(GrInvariantOutput::kWill_ReadInput);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrGammaEffect);
+
+const GrFragmentProcessor* GrGammaEffect::TestCreate(GrProcessorTestData* d) {
+ // We want to be sure and test sRGB sometimes
+ bool srgb = d->fRandom->nextBool();
+ return new GrGammaEffect(d->fTextures[GrProcessorUnitTest::kSkiaPMTextureIdx],
+ srgb ? 1.0f / 2.2f : d->fRandom->nextRangeScalar(0.5f, 2.0f));
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+void GrGammaEffect::onGetGLSLProcessorKey(const GrGLSLCaps& caps,
+ GrProcessorKeyBuilder* b) const {
+ GrGLGammaEffect::GenKey(*this, caps, b);
+}
+
+GrGLSLFragmentProcessor* GrGammaEffect::onCreateGLSLInstance() const {
+ return new GrGLGammaEffect();
+}
+
+const GrFragmentProcessor* GrGammaEffect::Create(GrTexture* texture, SkScalar gamma) {
+ return new GrGammaEffect(texture, gamma);
+}
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