77af6805e5
Adds a GrCoordTransform class and updates the framework to handle coord transforms similar to how it handles textures with GrTextureAccess. Renames GrGLEffectMatrix to GrGLCoordTransform and slightly repurposes it to be used by the framework instead of effects. R=bsalomon@google.com, robertphillips@google.com Review URL: https://codereview.chromium.org/24853002 git-svn-id: http://skia.googlecode.com/svn/trunk@11569 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_platform.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 : public 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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