ae81d5c4aa
Effects can ask the builder for local coords which may or may not be distinct from positions. GrEffectStage tracks changes to relationship between pos and local coords. GrGLEffectMatrix and GrSingleTextureEffect can use either pos or textures as intput coords GrSimpleTextureEffect now allows for an explicit texture coords attribute. Review URL: https://codereview.chromium.org/12531015 git-svn-id: http://skia.googlecode.com/svn/trunk@8264 2bbb7eff-a529-9590-31e7-b0007b416f81
88 lines
2.9 KiB
C++
88 lines
2.9 KiB
C++
/*
|
|
* 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 "GrNoncopyable.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 GrNoncopyable {
|
|
public:
|
|
typedef uint32_t EffectKey;
|
|
enum {
|
|
kNoEffectKey = 0,
|
|
kEffectKeyBits = 16,
|
|
/**
|
|
* Some aspects of the generated code may be determined by the particular textures that are
|
|
* associated with the effect. These manipulations are performed by GrGLShaderBuilder beyond
|
|
* GrGLEffects' control. So there is a dedicated part of the key which is combined
|
|
* automatically with the bits produced by GrGLEffect::GenKey().
|
|
*/
|
|
kTextureKeyBits = 6,
|
|
kAttribKeyBits = 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;
|
|
|
|
protected:
|
|
enum {
|
|
kIllegalEffectClassID = 0,
|
|
};
|
|
|
|
GrBackendEffectFactory() {
|
|
fEffectClassID = kIllegalEffectClassID;
|
|
}
|
|
virtual ~GrBackendEffectFactory() {}
|
|
|
|
static EffectKey GenID() {
|
|
GR_DEBUGCODE(static const int32_t kClassIDBits = 8 * sizeof(EffectKey) -
|
|
kTextureKeyBits -
|
|
kEffectKeyBits);
|
|
// 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;
|
|
GrAssert(id < (1 << kClassIDBits));
|
|
return static_cast<EffectKey>(id);
|
|
}
|
|
|
|
EffectKey fEffectClassID;
|
|
|
|
private:
|
|
static int32_t fCurrEffectClassID;
|
|
};
|
|
|
|
#endif
|