c2f7824436
BUG=skia:2181 R=robertphillips@google.com, jvanverth@google.com Author: bsalomon@google.com Review URL: https://codereview.chromium.org/171413004 git-svn-id: http://skia.googlecode.com/svn/trunk@13498 2bbb7eff-a529-9590-31e7-b0007b416f81
90 lines
3.6 KiB
C++
90 lines
3.6 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 "GrDrawEffect.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.
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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 that is accessible via GrEffect or
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GrGLEffect and is consistent between the two of them.
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*/
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virtual const char* name() const SK_OVERRIDE { return EffectClass::Name(); }
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/** Returns a value that identifies the GLSL shader code generated by
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a GrEffect. This enables caching of generated shaders. Part of the
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id identifies the GrEffect subclass. The remainder is based
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on the aspects of the GrEffect object's configuration that affect
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GLSL code generation. */
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virtual EffectKey glEffectKey(const GrDrawEffect& drawEffect,
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const GrGLCaps& caps) const SK_OVERRIDE {
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SkASSERT(kIllegalEffectClassID != fEffectClassID);
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EffectKey effectKey = GLEffect::GenKey(drawEffect, caps);
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EffectKey textureKey = GrGLProgramEffects::GenTextureKey(drawEffect, caps);
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EffectKey transformKey = GrGLProgramEffects::GenTransformKey(drawEffect);
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EffectKey attribKey = GrGLProgramEffects::GenAttribKey(drawEffect);
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#ifdef SK_DEBUG
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static const EffectKey kIllegalEffectKeyMask = (uint16_t) (~((1U << kEffectKeyBits) - 1));
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SkASSERT(!(kIllegalEffectKeyMask & effectKey));
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static const EffectKey kIllegalTextureKeyMask = (uint16_t) (~((1U << kTextureKeyBits) - 1));
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SkASSERT(!(kIllegalTextureKeyMask & textureKey));
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static const EffectKey kIllegalTransformKeyMask = (uint16_t) (~((1U << kTransformKeyBits) - 1));
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SkASSERT(!(kIllegalTransformKeyMask & transformKey));
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static const EffectKey kIllegalAttribKeyMask = (uint16_t) (~((1U << kAttribKeyBits) - 1));
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SkASSERT(!(kIllegalAttribKeyMask & textureKey));
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static const EffectKey kIllegalClassIDMask = (uint16_t) (~((1U << kClassIDBits) - 1));
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SkASSERT(!(kIllegalClassIDMask & fEffectClassID));
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#endif
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return (fEffectClassID << (kEffectKeyBits+kTextureKeyBits+kTransformKeyBits+kAttribKeyBits)) |
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(attribKey << (kEffectKeyBits+kTextureKeyBits+kTransformKeyBits)) |
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(transformKey << (kEffectKeyBits+kTextureKeyBits)) |
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(textureKey << kEffectKeyBits) |
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(effectKey);
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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 GrDrawEffect& drawEffect) const SK_OVERRIDE {
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return SkNEW_ARGS(GLEffect, (*this, drawEffect));
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}
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/** This class is a singleton. This function returns the single instance.
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*/
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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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fEffectClassID = GenID();
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}
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};
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#endif
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