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| 1 /* | |
| 2 * Copyright 2012 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #ifndef GrTBackendEffectFactory_DEFINED | |
| 9 #define GrTBackendEffectFactory_DEFINED | |
| 10 | |
| 11 #include "GrBackendEffectFactory.h" | |
| 12 #include "gl/GrGLProgramEffects.h" | |
| 13 | |
| 14 /** | |
| 15 * Implements GrBackendEffectFactory for a GrEffect subclass as a singleton. Thi
s can be used by | |
| 16 * most GrEffect subclasses to implement the GrEffect::getFactory() method: | |
| 17 * | |
| 18 * const GrBackendEffectFactory& MyEffect::getFactory() const { | |
| 19 * return GrTBackendEffectFactory<MyEffect>::getInstance(); | |
| 20 * } | |
| 21 * | |
| 22 * Using this class requires that the GrEffect subclass always produces the same
GrGLEffect | |
| 23 * subclass. Additionally, It adds the following requirements to the GrEffect an
d GrGLEffect | |
| 24 * subclasses: | |
| 25 * | |
| 26 * 1. The GrGLEffect used by GrEffect subclass MyEffect must be named or typedef
'ed to | |
| 27 * MyEffect::GLEffect. | |
| 28 * 2. MyEffect::GLEffect must have a static function: | |
| 29 * EffectKey GenKey(const GrEffect, const GrGLCaps&) | |
| 30 * which generates a key that maps 1 to 1 with code variations emitted by | |
| 31 * MyEffect::GLEffect::emitCode(). | |
| 32 * 3. MyEffect must have a static function: | |
| 33 * const char* Name() | |
| 34 * which returns a human-readable name for the effect. | |
| 35 */ | |
| 36 template <typename EffectClass> | |
| 37 class GrTBackendEffectFactory : public GrBackendEffectFactory { | |
| 38 | |
| 39 public: | |
| 40 typedef typename EffectClass::GLEffect GLEffect; | |
| 41 | |
| 42 /** Returns a human-readable name for the effect. Implemented using GLEffect
::Name as described | |
| 43 * in this class's comment. */ | |
| 44 virtual const char* name() const SK_OVERRIDE { return EffectClass::Name(); } | |
| 45 | |
| 46 | |
| 47 /** Implemented using GLEffect::GenKey as described in this class's comment.
*/ | |
| 48 virtual void getGLEffectKey(const GrEffect& effect, | |
| 49 const GrGLCaps& caps, | |
| 50 GrEffectKeyBuilder* b) const SK_OVERRIDE { | |
| 51 GLEffect::GenKey(effect, caps, b); | |
| 52 } | |
| 53 | |
| 54 /** Returns a new instance of the appropriate *GL* implementation class | |
| 55 for the given GrEffect; caller is responsible for deleting | |
| 56 the object. */ | |
| 57 virtual GrGLEffect* createGLInstance(const GrEffect& effect) const SK_OVERRI
DE { | |
| 58 return SkNEW_ARGS(GLEffect, (*this, effect)); | |
| 59 } | |
| 60 | |
| 61 /** This class is a singleton. This function returns the single instance. */ | |
| 62 static const GrBackendEffectFactory& getInstance() { | |
| 63 static SkAlignedSTStorage<1, GrTBackendEffectFactory> gInstanceMem; | |
| 64 static const GrTBackendEffectFactory* gInstance; | |
| 65 if (!gInstance) { | |
| 66 gInstance = SkNEW_PLACEMENT(gInstanceMem.get(), | |
| 67 GrTBackendEffectFactory); | |
| 68 } | |
| 69 return *gInstance; | |
| 70 } | |
| 71 | |
| 72 protected: | |
| 73 GrTBackendEffectFactory() {} | |
| 74 }; | |
| 75 | |
| 76 #endif | |
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