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 "GrDrawEffect.h" 13 #include "gl/GrGLProgramEffects.h" 14 15 /** 16 * Implements GrBackendEffectFactory for a GrEffect subclass as a singleton. 17 */ 18 template <typename EffectClass> 19 class GrTBackendEffectFactory : public GrBackendEffectFactory { 20 21 public: 22 typedef typename EffectClass::GLEffect GLEffect; 23 24 /** Returns a human-readable name that is accessible via GrEffect or 25 GrGLEffect and is consistent between the two of them. 26 */ name()27 virtual const char* name() const SK_OVERRIDE { return EffectClass::Name(); } 28 29 /** Returns a value that identifies the GLSL shader code generated by 30 a GrEffect. This enables caching of generated shaders. Part of the 31 id identifies the GrEffect subclass. The remainder is based 32 on the aspects of the GrEffect object's configuration that affect 33 GLSL code generation. */ glEffectKey(const GrDrawEffect & drawEffect,const GrGLCaps & caps)34 virtual EffectKey glEffectKey(const GrDrawEffect& drawEffect, 35 const GrGLCaps& caps) const SK_OVERRIDE { 36 SkASSERT(kIllegalEffectClassID != fEffectClassID); 37 EffectKey effectKey = GLEffect::GenKey(drawEffect, caps); 38 EffectKey textureKey = GrGLProgramEffects::GenTextureKey(drawEffect, caps); 39 EffectKey transformKey = GrGLProgramEffects::GenTransformKey(drawEffect); 40 EffectKey attribKey = GrGLProgramEffects::GenAttribKey(drawEffect); 41 #ifdef SK_DEBUG 42 static const EffectKey kIllegalEffectKeyMask = (uint16_t) (~((1U << kEffectKeyBits) - 1)); 43 SkASSERT(!(kIllegalEffectKeyMask & effectKey)); 44 45 static const EffectKey kIllegalTextureKeyMask = (uint16_t) (~((1U << kTextureKeyBits) - 1)); 46 SkASSERT(!(kIllegalTextureKeyMask & textureKey)); 47 48 static const EffectKey kIllegalTransformKeyMask = (uint16_t) (~((1U << kTransformKeyBits) - 1)); 49 SkASSERT(!(kIllegalTransformKeyMask & transformKey)); 50 51 static const EffectKey kIllegalAttribKeyMask = (uint16_t) (~((1U << kAttribKeyBits) - 1)); 52 SkASSERT(!(kIllegalAttribKeyMask & textureKey)); 53 54 static const EffectKey kIllegalClassIDMask = (uint16_t) (~((1U << kClassIDBits) - 1)); 55 SkASSERT(!(kIllegalClassIDMask & fEffectClassID)); 56 #endif 57 return (fEffectClassID << (kEffectKeyBits+kTextureKeyBits+kTransformKeyBits+kAttribKeyBits)) | 58 (attribKey << (kEffectKeyBits+kTextureKeyBits+kTransformKeyBits)) | 59 (transformKey << (kEffectKeyBits+kTextureKeyBits)) | 60 (textureKey << kEffectKeyBits) | 61 (effectKey); 62 } 63 64 /** Returns a new instance of the appropriate *GL* implementation class 65 for the given GrEffect; caller is responsible for deleting 66 the object. */ createGLInstance(const GrDrawEffect & drawEffect)67 virtual GrGLEffect* createGLInstance(const GrDrawEffect& drawEffect) const SK_OVERRIDE { 68 return SkNEW_ARGS(GLEffect, (*this, drawEffect)); 69 } 70 71 /** This class is a singleton. This function returns the single instance. 72 */ getInstance()73 static const GrBackendEffectFactory& getInstance() { 74 static SkAlignedSTStorage<1, GrTBackendEffectFactory> gInstanceMem; 75 static const GrTBackendEffectFactory* gInstance; 76 if (!gInstance) { 77 gInstance = SkNEW_PLACEMENT(gInstanceMem.get(), 78 GrTBackendEffectFactory); 79 } 80 return *gInstance; 81 } 82 83 protected: GrTBackendEffectFactory()84 GrTBackendEffectFactory() { 85 fEffectClassID = GenID(); 86 } 87 }; 88 89 #endif 90