| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef GrSkSLFP_DEFINED |
| #define GrSkSLFP_DEFINED |
| |
| #include "GrCaps.h" |
| #include "GrFragmentProcessor.h" |
| #include "GrCoordTransform.h" |
| #include "GrShaderCaps.h" |
| #include "SkSLCompiler.h" |
| #include "SkSLPipelineStageCodeGenerator.h" |
| #include "SkRefCnt.h" |
| #include "../private/GrSkSLFPFactoryCache.h" |
| #include <atomic> |
| |
| #if GR_TEST_UTILS |
| #define GR_FP_SRC_STRING const char* |
| #else |
| #define GR_FP_SRC_STRING static const char* |
| #endif |
| |
| class GrContext; |
| class GrSkSLFPFactory; |
| |
| class GrSkSLFP : public GrFragmentProcessor { |
| public: |
| /** |
| * Returns a new unique identifier. Each different SkSL fragment processor should call |
| * NewIndex once, statically, and use this index for all calls to Make. |
| */ |
| static int NewIndex() { |
| static std::atomic<int> nextIndex{0}; |
| return nextIndex++; |
| } |
| |
| /** |
| * Creates a new fragment processor from an SkSL source string and a struct of inputs to the |
| * program. The input struct's type is derived from the 'in' variables in the SkSL source, so |
| * e.g. the shader: |
| * |
| * in bool dither; |
| * in float x; |
| * in float y; |
| * .... |
| * |
| * would expect a pointer to a struct set up like: |
| * |
| * struct { |
| * bool dither; |
| * float x; |
| * float y; |
| * }; |
| * |
| * As turning SkSL into GLSL / SPIR-V / etc. is fairly expensive, and the output may differ |
| * based on the inputs, internally the process is divided into two steps: we first parse and |
| * semantically analyze the SkSL into an internal representation, and then "specialize" this |
| * internal representation based on the inputs. The unspecialized internal representation of |
| * the program is cached, so further specializations of the same code are much faster than the |
| * first call. |
| * |
| * This caching is based on the 'index' parameter, which should be derived by statically calling |
| * 'NewIndex()'. Each given SkSL string should have a single, statically defined index |
| * associated with it. |
| */ |
| static std::unique_ptr<GrSkSLFP> Make( |
| GrContext* context, |
| int index, |
| const char* name, |
| const char* sksl, |
| const void* inputs, |
| size_t inputSize); |
| |
| const char* name() const override; |
| |
| void addChild(std::unique_ptr<GrFragmentProcessor> child); |
| |
| std::unique_ptr<GrFragmentProcessor> clone() const override; |
| |
| private: |
| GrSkSLFP(sk_sp<GrSkSLFPFactoryCache> factoryCache, const GrShaderCaps* shaderCaps, int fIndex, |
| const char* name, const char* sksl, const void* inputs, size_t inputSize); |
| |
| GrSkSLFP(const GrSkSLFP& other); |
| |
| GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; |
| |
| void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override; |
| |
| bool onIsEqual(const GrFragmentProcessor&) const override; |
| |
| void createFactory() const; |
| |
| sk_sp<GrSkSLFPFactoryCache> fFactoryCache; |
| |
| const sk_sp<GrShaderCaps> fShaderCaps; |
| |
| mutable sk_sp<GrSkSLFPFactory> fFactory; |
| |
| int fIndex; |
| |
| const char* fName; |
| |
| const char* fSkSL; |
| |
| const std::unique_ptr<int8_t[]> fInputs; |
| |
| size_t fInputSize; |
| |
| mutable SkSL::String fKey; |
| |
| GR_DECLARE_FRAGMENT_PROCESSOR_TEST |
| |
| typedef GrFragmentProcessor INHERITED; |
| |
| friend class GrGLSLSkSLFP; |
| |
| friend class GrSkSLFPFactory; |
| }; |
| |
| /** |
| * Produces GrFragmentProcessors from SkSL code. As the shader code produced from the SkSL depends |
| * upon the inputs to the SkSL (static if's, etc.) we first create a factory for a given SkSL |
| * string, then use that to create the actual GrFragmentProcessor. |
| */ |
| class GrSkSLFPFactory : public SkNVRefCnt<GrSkSLFPFactory> { |
| public: |
| /** |
| * Constructs a GrSkSLFPFactory for a given SkSL source string. Creating a factory will |
| * preprocess the SkSL and determine which of its inputs are declared "key" (meaning they cause |
| * the produced shaders to differ), so it is important to reuse the same factory instance for |
| * the same shader in order to avoid repeatedly re-parsing the SkSL. |
| */ |
| GrSkSLFPFactory(const char* name, const GrShaderCaps* shaderCaps, const char* sksl); |
| |
| const SkSL::Program* getSpecialization(const SkSL::String& key, const void* inputs, |
| size_t inputSize); |
| |
| const char* fName; |
| |
| SkSL::Compiler fCompiler; |
| |
| std::shared_ptr<SkSL::Program> fBaseProgram; |
| |
| std::vector<const SkSL::Variable*> fInputVars; |
| |
| std::vector<const SkSL::Variable*> fKeyVars; |
| |
| std::unordered_map<SkSL::String, std::unique_ptr<const SkSL::Program>> fSpecializations; |
| |
| friend class GrSkSLFP; |
| }; |
| |
| #endif |