1 /* 2 * Copyright 2020 Google LLC 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef GrMatrixEffect_DEFINED 9 #define GrMatrixEffect_DEFINED 10 11 #include "include/core/SkM44.h" 12 #include "include/core/SkTypes.h" 13 14 #include "src/gpu/GrFragmentProcessor.h" 15 16 class GrMatrixEffect : public GrFragmentProcessor { 17 public: Make(const SkMatrix & matrix,std::unique_ptr<GrFragmentProcessor> child)18 static std::unique_ptr<GrFragmentProcessor> Make(const SkMatrix& matrix, 19 std::unique_ptr<GrFragmentProcessor> child) { 20 if (matrix.isIdentity()) { 21 return child; 22 } 23 return std::unique_ptr<GrFragmentProcessor>(new GrMatrixEffect(matrix, std::move(child))); 24 } 25 usesExplicitReturn()26 bool usesExplicitReturn() const override { return true; } 27 std::unique_ptr<GrFragmentProcessor> clone() const override; name()28 const char* name() const override { return "MatrixEffect"; } matrix()29 const SkMatrix& matrix() const { return fMatrix; } 30 31 private: 32 GrMatrixEffect(const GrMatrixEffect& src); 33 GrMatrixEffect(SkMatrix matrix,std::unique_ptr<GrFragmentProcessor> child)34 GrMatrixEffect(SkMatrix matrix, std::unique_ptr<GrFragmentProcessor> child) 35 : INHERITED(kGrMatrixEffect_ClassID, ProcessorOptimizationFlags(child.get())) 36 , fMatrix(matrix) { 37 SkASSERT(child); 38 this->registerChild(std::move(child), 39 SkSL::SampleUsage::UniformMatrix("matrix", matrix.hasPerspective())); 40 } 41 42 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; 43 void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override; 44 bool onIsEqual(const GrFragmentProcessor&) const override; constantOutputForConstantInput(const SkPMColor4f & inputColor)45 SkPMColor4f constantOutputForConstantInput(const SkPMColor4f& inputColor) const override { 46 return ConstantOutputForConstantInput(this->childProcessor(0), inputColor); 47 } 48 49 SkMatrix fMatrix; 50 51 GR_DECLARE_FRAGMENT_PROCESSOR_TEST 52 using INHERITED = GrFragmentProcessor; 53 }; 54 #endif 55