4187a2fc71
git-svn-id: http://skia.googlecode.com/svn/trunk@6289 2bbb7eff-a529-9590-31e7-b0007b416f81
85 lines
2.8 KiB
C++
85 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 GrBackendEffectFactory_DEFINED
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#define GrBackendEffectFactory_DEFINED
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#include "GrTypes.h"
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#include "SkTemplates.h"
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#include "SkThread_platform.h"
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#include "GrNoncopyable.h"
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/** Given a GrEffect of a particular type, creates the corresponding graphics-backend-specific
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effect object. Also tracks equivalence of shaders generated via a key. Each factory instance
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is assigned a generation ID at construction. The ID of the return of GrEffect::getFactory()
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is used as a type identifier. Thus a GrEffect subclass must return a singleton from
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getFactory(). GrEffect subclasses should use the derived class GrTBackendEffectFactory that is
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templated on the GrEffect subclass as their factory object. It requires that the GrEffect
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subclass has a nested class (or typedef) GLEffect which is its GL implementation and a subclass
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of GrGLEffect.
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*/
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class GrEffect;
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class GrEffectStage;
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class GrGLEffect;
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class GrGLCaps;
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class GrBackendEffectFactory : public GrNoncopyable {
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public:
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typedef uint32_t EffectKey;
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enum {
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kEffectKeyBits = 12,
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/**
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* Some aspects of the generated code may be determined by the particular textures that are
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* associated with the effect. These manipulations are performed by GrGLShaderBuilder beyond
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* GrGLEffects' control. So there is a dedicated part of the key which is combined
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* automatically with the bits produced by GrGLEffect::GenKey().
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*/
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kTextureKeyBits = 6
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};
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virtual EffectKey glEffectKey(const GrEffectStage&, const GrGLCaps&) const = 0;
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virtual GrGLEffect* createGLInstance(const GrEffect&) const = 0;
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bool operator ==(const GrBackendEffectFactory& b) const {
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return fEffectClassID == b.fEffectClassID;
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}
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bool operator !=(const GrBackendEffectFactory& b) const {
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return !(*this == b);
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}
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virtual const char* name() const = 0;
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protected:
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enum {
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kIllegalEffectClassID = 0,
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};
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GrBackendEffectFactory() {
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fEffectClassID = kIllegalEffectClassID;
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}
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static EffectKey GenID() {
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GR_DEBUGCODE(static const int32_t kClassIDBits = 8 * sizeof(EffectKey) -
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kTextureKeyBits -
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kEffectKeyBits);
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// fCurrEffectClassID has been initialized to kIllegalEffectClassID. The
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// atomic inc returns the old value not the incremented value. So we add
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// 1 to the returned value.
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int32_t id = sk_atomic_inc(&fCurrEffectClassID) + 1;
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GrAssert(id < (1 << kClassIDBits));
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return static_cast<EffectKey>(id);
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}
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EffectKey fEffectClassID;
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private:
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static int32_t fCurrEffectClassID;
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};
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#endif
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