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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrBackendEffectFactory_DEFINED
#define GrBackendEffectFactory_DEFINED
#include "GrTypes.h"
#include "SkTemplates.h"
#include "SkThread_platform.h"
#include "SkTypes.h"
/** Given a GrEffect of a particular type, creates the corresponding graphics-backend-specific
effect object. Also tracks equivalence of shaders generated via a key. Each factory instance
is assigned a generation ID at construction. The ID of the return of GrEffect::getFactory()
is used as a type identifier. Thus a GrEffect subclass must return a singleton from
getFactory(). GrEffect subclasses should use the derived class GrTBackendEffectFactory that is
templated on the GrEffect subclass as their factory object. It requires that the GrEffect
subclass has a nested class (or typedef) GLEffect which is its GL implementation and a subclass
of GrGLEffect.
*/
class GrEffectRef;
class GrGLEffect;
class GrGLCaps;
class GrDrawEffect;
class GrBackendEffectFactory : public SkNoncopyable {
public:
typedef uint32_t EffectKey;
enum {
kNoEffectKey = 0,
kEffectKeyBits = 10,
/**
* The framework automatically includes coord transforms and texture accesses in their
* effect's EffectKey, so effects don't need to account for them in GenKey().
*/
kTextureKeyBits = 4,
kTransformKeyBits = 6,
kAttribKeyBits = 6,
kClassIDBits = 6
};
virtual EffectKey glEffectKey(const GrDrawEffect&, const GrGLCaps&) const = 0;
virtual GrGLEffect* createGLInstance(const GrDrawEffect&) const = 0;
bool operator ==(const GrBackendEffectFactory& b) const {
return fEffectClassID == b.fEffectClassID;
}
bool operator !=(const GrBackendEffectFactory& b) const {
return !(*this == b);
}
virtual const char* name() const = 0;
static EffectKey GetTransformKey(EffectKey key) {
return key >> (kEffectKeyBits + kTextureKeyBits) & ((1U << kTransformKeyBits) - 1);
}
protected:
enum {
kIllegalEffectClassID = 0,
};
GrBackendEffectFactory() {
fEffectClassID = kIllegalEffectClassID;
}
virtual ~GrBackendEffectFactory() {}
static EffectKey GenID() {
SkDEBUGCODE(static const int32_t kClassIDBits = 8 * sizeof(EffectKey) -
kTextureKeyBits - kEffectKeyBits - kAttribKeyBits);
// fCurrEffectClassID has been initialized to kIllegalEffectClassID. The
// atomic inc returns the old value not the incremented value. So we add
// 1 to the returned value.
int32_t id = sk_atomic_inc(&fCurrEffectClassID) + 1;
SkASSERT(id < (1 << kClassIDBits));
return static_cast<EffectKey>(id);
}
EffectKey fEffectClassID;
private:
static int32_t fCurrEffectClassID;
};
#endif
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