86b0de4745
Too much depends on SkThread being in include/core in Chrome build.
This reverts commit b1aec17df6.
NOTREECHECKS=true
NOTRY=true
R=reed@google.com, mtklein@google.com
TBR=reed
BUG=skia:
Author: mtklein@chromium.org
Review URL: https://codereview.chromium.org/303813003
git-svn-id: http://skia.googlecode.com/svn/trunk@14934 2bbb7eff-a529-9590-31e7-b0007b416f81
91 lines
2.9 KiB
C++
91 lines
2.9 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.h"
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#include "SkTypes.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 GrEffectRef;
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class GrGLEffect;
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class GrGLCaps;
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class GrDrawEffect;
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class GrBackendEffectFactory : SkNoncopyable {
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public:
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typedef uint32_t EffectKey;
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enum {
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kNoEffectKey = 0,
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kEffectKeyBits = 10,
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/**
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* The framework automatically includes coord transforms and texture accesses in their
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* effect's EffectKey, so effects don't need to account for them in GenKey().
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*/
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kTextureKeyBits = 4,
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kTransformKeyBits = 6,
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kAttribKeyBits = 6,
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kClassIDBits = 6
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};
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virtual EffectKey glEffectKey(const GrDrawEffect&, const GrGLCaps&) const = 0;
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virtual GrGLEffect* createGLInstance(const GrDrawEffect&) 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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static EffectKey GetTransformKey(EffectKey key) {
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return key >> (kEffectKeyBits + kTextureKeyBits) & ((1U << kTransformKeyBits) - 1);
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}
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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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virtual ~GrBackendEffectFactory() {}
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static EffectKey GenID() {
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SkDEBUGCODE(static const int32_t kClassIDBits = 8 * sizeof(EffectKey) -
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kTextureKeyBits - kEffectKeyBits - kAttribKeyBits);
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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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SkASSERT(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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