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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 GrTBackendProcessorFactory_DEFINED |
| 9 #define GrTBackendProcessorFactory_DEFINED |
| 10 |
| 11 #include "GrBackendProcessorFactory.h" |
| 12 #include "gl/GrGLProgramEffects.h" |
| 13 |
| 14 /** |
| 15 * Implements GrBackendEffectFactory for a GrProcessor subclass as a singleton.
This can be used by |
| 16 * most GrProcessor subclasses to implement the GrProcessor::getFactory() method
: |
| 17 * |
| 18 * const GrBackendEffectFactory& MyEffect::getFactory() const { |
| 19 * return GrTBackendEffectFactory<MyEffect>::getInstance(); |
| 20 * } |
| 21 * |
| 22 * Using this class requires that the GrProcessor subclass always produces the s
ame GrGLProcessor |
| 23 * subclass. Additionally, it adds the following requirements to the GrProcessor
and GrGLProcessor |
| 24 * subclasses: |
| 25 * |
| 26 * 1. The GrGLProcessor used by GrProcessor subclass MyEffect must be named or t
ypedef'ed to |
| 27 * MyEffect::GLProcessor. |
| 28 * 2. MyEffect::GLProcessor must have a static function: |
| 29 * EffectKey GenKey(const GrProcessor, const GrGLCaps&) |
| 30 * which generates a key that maps 1 to 1 with code variations emitted by |
| 31 * MyEffect::GLProcessor::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 <class ProcessorClass, class BackEnd, class ProcessorBase, class GLProc
essorBase> |
| 37 class GrTBackendProcessorFactory : public BackEnd { |
| 38 public: |
| 39 typedef typename ProcessorClass::GLProcessor GLProcessor; |
| 40 |
| 41 /** Returns a human-readable name for the effect. Implemented using GLProces
sor::Name as |
| 42 * described in this class's comment. */ |
| 43 virtual const char* name() const SK_OVERRIDE { return ProcessorClass::Name()
; } |
| 44 |
| 45 |
| 46 /** Implemented using GLProcessor::GenKey as described in this class's comme
nt. */ |
| 47 virtual void getGLProcessorKey(const GrProcessor& effect, |
| 48 const GrGLCaps& caps, |
| 49 GrProcessorKeyBuilder* b) const SK_OVERRIDE { |
| 50 GLProcessor::GenKey(effect, caps, b); |
| 51 } |
| 52 |
| 53 /** Returns a new instance of the appropriate *GL* implementation class |
| 54 for the given GrProcessor; caller is responsible for deleting |
| 55 the object. */ |
| 56 virtual GLProcessorBase* createGLInstance(const ProcessorBase& effect) const
SK_OVERRIDE { |
| 57 return SkNEW_ARGS(GLProcessor, (*this, effect)); |
| 58 } |
| 59 |
| 60 /** This class is a singleton. This function returns the single instance. */ |
| 61 static const BackEnd& getInstance() { |
| 62 static SkAlignedSTStorage<1, GrTBackendProcessorFactory> gInstanceMem; |
| 63 static const GrTBackendProcessorFactory* gInstance; |
| 64 if (!gInstance) { |
| 65 gInstance = SkNEW_PLACEMENT(gInstanceMem.get(), |
| 66 GrTBackendProcessorFactory); |
| 67 } |
| 68 return *gInstance; |
| 69 } |
| 70 |
| 71 protected: |
| 72 GrTBackendProcessorFactory() {} |
| 73 }; |
| 74 |
| 75 /* |
| 76 * Every effect so far derives from one of the following subclasses of GrTBacken
dProcessorFactory. |
| 77 * All of this machinery is necessary to ensure that creatGLInstace is typesafe
and does not |
| 78 * require any casting |
| 79 */ |
| 80 template <class ProcessorClass> |
| 81 class GrTBackendGeometryProcessorFactory |
| 82 : public GrTBackendProcessorFactory<ProcessorClass, |
| 83 GrBackendGeometryProcessorFactory, |
| 84 GrGeometryProcessor, |
| 85 GrGLGeometryProcessor> { |
| 86 protected: |
| 87 GrTBackendGeometryProcessorFactory() {} |
| 88 }; |
| 89 |
| 90 template <class ProcessorClass> |
| 91 class GrTBackendFragmentProcessorFactory |
| 92 : public GrTBackendProcessorFactory<ProcessorClass, |
| 93 GrBackendFragmentProcessorFactory, |
| 94 GrFragmentProcessor, |
| 95 GrGLFragmentProcessor> { |
| 96 protected: |
| 97 GrTBackendFragmentProcessorFactory() {} |
| 98 }; |
| 99 |
| 100 |
| 101 #endif |
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