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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGLProgramEffects_DEFINED
#define GrGLProgramEffects_DEFINED
#include "GrBackendProcessorFactory.h"
#include "GrGLProgramDataManager.h"
#include "GrGpu.h"
#include "GrTexture.h"
#include "GrTextureAccess.h"
class GrProcessor;
class GrProcessorStage;
class GrGLVertexProgramEffectsBuilder;
class GrGLProgramBuilder;
class GrGLFullProgramBuilder;
class GrGLFragmentOnlyProgramBuilder;
/**
* This class encapsulates an array of GrGLProcessors and their supporting data (coord transforms
* and textures). It is built with GrGLProgramEffectsBuilder, then used to manage the necessary GL
* state and shader uniforms.
*/
class GrGLProgramEffects : public SkRefCnt {
public:
typedef GrGLProgramDataManager::UniformHandle UniformHandle;
typedef GrGLProgramDataManager::VaryingHandle VaryingHandle;
virtual ~GrGLProgramEffects();
/**
* Assigns a texture unit to each sampler. It starts on *texUnitIdx and writes the next
* available unit to *texUnitIdx when it returns.
*/
void initSamplers(const GrGLProgramDataManager&, int* texUnitIdx);
/**
* Calls setData() on each effect, and sets their transformation matrices and texture bindings.
*/
virtual void setData(GrGpuGL*,
GrGpu::DrawType,
const GrGLProgramDataManager&,
const GrGeometryStage* effectStages) {
SkFAIL("For geometry processor only");
}
virtual void setData(GrGpuGL*,
GrGpu::DrawType,
const GrGLProgramDataManager&,
const GrFragmentStage* effectStages[]) = 0;
protected:
GrGLProgramEffects(int reserveCount)
: fGLProcessors(reserveCount)
, fSamplers(reserveCount) {
}
/**
* Helper for setData(). Binds all the textures for an effect.
*/
void bindTextures(GrGpuGL*, const GrProcessor&, int effectIdx);
struct Sampler {
SkDEBUGCODE(Sampler() : fTextureUnit(-1) {})
UniformHandle fUniform;
int fTextureUnit;
};
/*
* Helpers for shader builders to build up program effects objects alongside shader code
*/
void addEffect(GrGLProcessor* effect) { fGLProcessors.push_back(effect); }
SkTArray<Sampler, true>& addSamplers() { return fSamplers.push_back(); }
SkTArray<GrGLProcessor*> fGLProcessors;
SkTArray<SkSTArray<4, Sampler, true> > fSamplers;
private:
friend class GrGLProgramBuilder;
friend class GrGLFullProgramBuilder;
friend class GrGLFragmentOnlyShaderBuilder;
typedef SkRefCnt INHERITED;
};
////////////////////////////////////////////////////////////////////////////////
/**
* This is a GrGLProgramEffects implementation that does coord transforms with the vertex shader.
*/
class GrGLVertexProgramEffects : public GrGLProgramEffects {
public:
virtual void setData(GrGpuGL*,
GrGpu::DrawType,
const GrGLProgramDataManager&,
const GrGeometryStage* effectStages) SK_OVERRIDE;
virtual void setData(GrGpuGL*,
GrGpu::DrawType,
const GrGLProgramDataManager&,
const GrFragmentStage* effectStages[]) SK_OVERRIDE;
private:
GrGLVertexProgramEffects(int reserveCount, bool explicitLocalCoords)
: INHERITED(reserveCount)
, fTransforms(reserveCount)
, fHasExplicitLocalCoords(explicitLocalCoords) {
}
struct Transform {
Transform() { fCurrentValue = SkMatrix::InvalidMatrix(); }
UniformHandle fHandle;
SkMatrix fCurrentValue;
};
struct PathTransform {
PathTransform() { fCurrentValue = SkMatrix::InvalidMatrix(); }
VaryingHandle fHandle;
SkMatrix fCurrentValue;
GrSLType fType;
};
/*
* These functions are used by the builders to build up program effects along side the shader
* code itself
*/
SkSTArray<2, Transform, true>& addTransforms() { return fTransforms.push_back(); }
SkTArray<PathTransform, true>& addPathTransforms() { return fPathTransforms.push_back(); }
/**
* Helper for setData(). Sets all the transform matrices for an effect.
*/
void setDataInternal(GrGpuGL* gpu,
GrGpu::DrawType drawType,
const GrGLProgramDataManager& programDataManager,
const GrProcessorStage& effectStage,
int index);
void setTransformData(GrGpuGL* gpu, const GrGLProgramDataManager&, const GrProcessorStage&,
int effectIdx);
void setPathTransformData(GrGpuGL* gpu, const GrGLProgramDataManager&,
const GrProcessorStage&, int effectIdx);
SkTArray<SkSTArray<2, Transform, true> > fTransforms;
SkTArray<SkTArray<PathTransform, true> > fPathTransforms;
bool fHasExplicitLocalCoords;
friend class GrGLFullProgramBuilder;
typedef GrGLProgramEffects INHERITED;
};
////////////////////////////////////////////////////////////////////////////////
/**
* This is a GrGLProgramEffects implementation that does coord transforms with
* the the NV_path_rendering PathTexGen functionality.
*/
class GrGLPathTexGenProgramEffects : public GrGLProgramEffects {
public:
virtual void setData(GrGpuGL*,
GrGpu::DrawType,
const GrGLProgramDataManager&,
const GrFragmentStage* effectStages[]) SK_OVERRIDE;
private:
GrGLPathTexGenProgramEffects(int reserveCount)
: INHERITED(reserveCount)
, fTransforms(reserveCount) {
}
/**
* Helper for setData(). Sets the PathTexGen state for each transform in an effect.
*/
void setPathTexGenState(GrGpuGL*, const GrProcessorStage&, int effectIdx);
struct Transforms {
Transforms(int texCoordIndex)
: fTexCoordIndex(texCoordIndex) {}
int fTexCoordIndex;
};
/*
* Helper for fragment only shader builder to build up the program effects alongside the shader
*/
void addTransforms(int coordIndex) {
fTransforms.push_back(Transforms(coordIndex));
}
SkTArray<Transforms> fTransforms;
friend class GrGLFragmentOnlyProgramBuilder;
typedef GrGLProgramEffects INHERITED;
};
#endif
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