49586bec73
BUG=skia: Committed: https://skia.googlesource.com/skia/+/8ddbe8b9366c8c59c4fb55f01f253de8a0b37d6e R=bsalomon@google.com Author: joshualitt@chromium.org Review URL: https://codereview.chromium.org/571163002
77 lines
2.8 KiB
C++
77 lines
2.8 KiB
C++
/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef GrTBackendEffectFactory_DEFINED
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#define GrTBackendEffectFactory_DEFINED
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#include "GrBackendEffectFactory.h"
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#include "gl/GrGLProgramEffects.h"
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/**
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* Implements GrBackendEffectFactory for a GrEffect subclass as a singleton. This can be used by
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* most GrEffect subclasses to implement the GrEffect::getFactory() method:
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*
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* const GrBackendEffectFactory& MyEffect::getFactory() const {
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* return GrTBackendEffectFactory<MyEffect>::getInstance();
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* }
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*
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* Using this class requires that the GrEffect subclass always produces the same GrGLEffect
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* subclass. Additionally, It adds the following requirements to the GrEffect and GrGLEffect
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* subclasses:
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*
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* 1. The GrGLEffect used by GrEffect subclass MyEffect must be named or typedef'ed to
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* MyEffect::GLEffect.
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* 2. MyEffect::GLEffect must have a static function:
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* EffectKey GenKey(const GrEffect, const GrGLCaps&)
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* which generates a key that maps 1 to 1 with code variations emitted by
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* MyEffect::GLEffect::emitCode().
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* 3. MyEffect must have a static function:
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* const char* Name()
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* which returns a human-readable name for the effect.
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*/
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template <typename EffectClass>
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class GrTBackendEffectFactory : public GrBackendEffectFactory {
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public:
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typedef typename EffectClass::GLEffect GLEffect;
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/** Returns a human-readable name for the effect. Implemented using GLEffect::Name as described
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* in this class's comment. */
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virtual const char* name() const SK_OVERRIDE { return EffectClass::Name(); }
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/** Implemented using GLEffect::GenKey as described in this class's comment. */
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virtual void getGLEffectKey(const GrEffect& effect,
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const GrGLCaps& caps,
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GrEffectKeyBuilder* b) const SK_OVERRIDE {
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GLEffect::GenKey(effect, caps, b);
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}
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/** Returns a new instance of the appropriate *GL* implementation class
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for the given GrEffect; caller is responsible for deleting
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the object. */
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virtual GrGLEffect* createGLInstance(const GrEffect& effect) const SK_OVERRIDE {
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return SkNEW_ARGS(GLEffect, (*this, effect));
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}
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/** This class is a singleton. This function returns the single instance. */
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static const GrBackendEffectFactory& getInstance() {
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static SkAlignedSTStorage<1, GrTBackendEffectFactory> gInstanceMem;
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static const GrTBackendEffectFactory* gInstance;
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if (!gInstance) {
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gInstance = SkNEW_PLACEMENT(gInstanceMem.get(),
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GrTBackendEffectFactory);
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}
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return *gInstance;
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}
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protected:
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GrTBackendEffectFactory() {}
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};
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#endif
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