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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.h"
#include "SkTypes.h"
#include "SkTArray.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 GrGLEffect;
class GrGLCaps;
class GrDrawEffect;
/**
* Used by effects to build their keys. It incorpates each per-effect key into a larger shader key.
*/
class GrEffectKeyBuilder {
public:
GrEffectKeyBuilder(SkTArray<unsigned char, true>* data) : fData(data), fCount(0) {
SkASSERT(0 == fData->count() % sizeof(uint32_t));
}
void add32(uint32_t v) {
++fCount;
fData->push_back_n(4, reinterpret_cast<uint8_t*>(&v));
}
size_t size() const { return sizeof(uint32_t) * fCount; }
private:
SkTArray<uint8_t, true>* fData; // unowned ptr to the larger key.
int fCount; // number of uint32_ts added to fData by the effect.
};
class GrBackendEffectFactory : SkNoncopyable {
public:
typedef uint32_t EffectKey;
virtual bool getGLEffectKey(const GrDrawEffect&, const GrGLCaps&, GrEffectKeyBuilder*) 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;
protected:
enum {
kIllegalEffectClassID = 0,
};
GrBackendEffectFactory() {
fEffectClassID = kIllegalEffectClassID;
}
virtual ~GrBackendEffectFactory() {}
static int32_t GenID() {
// 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;
return id;
}
int32_t fEffectClassID;
private:
static int32_t fCurrEffectClassID;
};
#endif
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