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* Copyright 2018 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#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>
#define GR_FP_SRC_STRING const char*
#define GR_FP_SRC_STRING static const char*
class GrContext_Base;
class GrSkSLFPFactory;
class GrSkSLFP : public GrFragmentProcessor {
* 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_Base* context,
int index,
const char* name,
const char* sksl,
const void* inputs,
size_t inputSize,
SkSL::Program::Kind kind = SkSL::Program::kPipelineStage_Kind);
static std::unique_ptr<GrSkSLFP> Make(
GrContext_Base* context,
int index,
const char* name,
SkString sksl,
const void* inputs,
size_t inputSize,
SkSL::Program::Kind kind = SkSL::Program::kPipelineStage_Kind);
const char* name() const override;
void addChild(std::unique_ptr<GrFragmentProcessor> child);
std::unique_ptr<GrFragmentProcessor> clone() const override;
GrSkSLFP(sk_sp<GrSkSLFPFactoryCache> factoryCache, const GrShaderCaps* shaderCaps,
SkSL::Program::Kind kind, int fIndex, const char* name, const char* sksl,
SkString skslString, 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;
SkSL::Program::Kind fKind;
int fIndex;
const char* fName;
// For object lifetime purposes, we have fields for the SkSL as both a const char* and a
// SkString. The const char* is the one we actually use, but it may point to the SkString's
// bytes. Since GrSkSLFPs are frequently created from constant strings, this allows us to
// generally avoid the overhead of copying the bytes into an SkString (in which case fSkSLString
// is the empty string), while still allowing the GrSkSLFP to manage the string's lifetime when
// needed.
SkString fSkSLString;
const char* fSkSL;
const std::unique_ptr<int8_t[]> fInputs;
size_t fInputSize;
mutable SkSL::String fKey;
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> {
* 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,
SkSL::Program::Kind kind = SkSL::Program::kPipelineStage_Kind);
const SkSL::Program* getSpecialization(const SkSL::String& key, const void* inputs,
size_t inputSize);
SkSL::Program::Kind fKind;
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;