1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/gpu/GrTBackendEffectFactory.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,89 @@
1.4 +/*
1.5 + * Copyright 2012 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef GrTBackendEffectFactory_DEFINED
1.12 +#define GrTBackendEffectFactory_DEFINED
1.13 +
1.14 +#include "GrBackendEffectFactory.h"
1.15 +#include "GrDrawEffect.h"
1.16 +#include "gl/GrGLProgramEffects.h"
1.17 +
1.18 +/**
1.19 + * Implements GrBackendEffectFactory for a GrEffect subclass as a singleton.
1.20 + */
1.21 +template <typename EffectClass>
1.22 +class GrTBackendEffectFactory : public GrBackendEffectFactory {
1.23 +
1.24 +public:
1.25 + typedef typename EffectClass::GLEffect GLEffect;
1.26 +
1.27 + /** Returns a human-readable name that is accessible via GrEffect or
1.28 + GrGLEffect and is consistent between the two of them.
1.29 + */
1.30 + virtual const char* name() const SK_OVERRIDE { return EffectClass::Name(); }
1.31 +
1.32 + /** Returns a value that identifies the GLSL shader code generated by
1.33 + a GrEffect. This enables caching of generated shaders. Part of the
1.34 + id identifies the GrEffect subclass. The remainder is based
1.35 + on the aspects of the GrEffect object's configuration that affect
1.36 + GLSL code generation. */
1.37 + virtual EffectKey glEffectKey(const GrDrawEffect& drawEffect,
1.38 + const GrGLCaps& caps) const SK_OVERRIDE {
1.39 + SkASSERT(kIllegalEffectClassID != fEffectClassID);
1.40 + EffectKey effectKey = GLEffect::GenKey(drawEffect, caps);
1.41 + EffectKey textureKey = GrGLProgramEffects::GenTextureKey(drawEffect, caps);
1.42 + EffectKey transformKey = GrGLProgramEffects::GenTransformKey(drawEffect);
1.43 + EffectKey attribKey = GrGLProgramEffects::GenAttribKey(drawEffect);
1.44 +#ifdef SK_DEBUG
1.45 + static const EffectKey kIllegalEffectKeyMask = (uint16_t) (~((1U << kEffectKeyBits) - 1));
1.46 + SkASSERT(!(kIllegalEffectKeyMask & effectKey));
1.47 +
1.48 + static const EffectKey kIllegalTextureKeyMask = (uint16_t) (~((1U << kTextureKeyBits) - 1));
1.49 + SkASSERT(!(kIllegalTextureKeyMask & textureKey));
1.50 +
1.51 + static const EffectKey kIllegalTransformKeyMask = (uint16_t) (~((1U << kTransformKeyBits) - 1));
1.52 + SkASSERT(!(kIllegalTransformKeyMask & transformKey));
1.53 +
1.54 + static const EffectKey kIllegalAttribKeyMask = (uint16_t) (~((1U << kAttribKeyBits) - 1));
1.55 + SkASSERT(!(kIllegalAttribKeyMask & textureKey));
1.56 +
1.57 + static const EffectKey kIllegalClassIDMask = (uint16_t) (~((1U << kClassIDBits) - 1));
1.58 + SkASSERT(!(kIllegalClassIDMask & fEffectClassID));
1.59 +#endif
1.60 + return (fEffectClassID << (kEffectKeyBits+kTextureKeyBits+kTransformKeyBits+kAttribKeyBits)) |
1.61 + (attribKey << (kEffectKeyBits+kTextureKeyBits+kTransformKeyBits)) |
1.62 + (transformKey << (kEffectKeyBits+kTextureKeyBits)) |
1.63 + (textureKey << kEffectKeyBits) |
1.64 + (effectKey);
1.65 + }
1.66 +
1.67 + /** Returns a new instance of the appropriate *GL* implementation class
1.68 + for the given GrEffect; caller is responsible for deleting
1.69 + the object. */
1.70 + virtual GrGLEffect* createGLInstance(const GrDrawEffect& drawEffect) const SK_OVERRIDE {
1.71 + return SkNEW_ARGS(GLEffect, (*this, drawEffect));
1.72 + }
1.73 +
1.74 + /** This class is a singleton. This function returns the single instance.
1.75 + */
1.76 + static const GrBackendEffectFactory& getInstance() {
1.77 + static SkAlignedSTStorage<1, GrTBackendEffectFactory> gInstanceMem;
1.78 + static const GrTBackendEffectFactory* gInstance;
1.79 + if (!gInstance) {
1.80 + gInstance = SkNEW_PLACEMENT(gInstanceMem.get(),
1.81 + GrTBackendEffectFactory);
1.82 + }
1.83 + return *gInstance;
1.84 + }
1.85 +
1.86 +protected:
1.87 + GrTBackendEffectFactory() {
1.88 + fEffectClassID = GenID();
1.89 + }
1.90 +};
1.91 +
1.92 +#endif
