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| 1 /* | 1 /* |
| 2 * Copyright 2012 Google Inc. | 2 * Copyright 2012 Google Inc. |
| 3 * | 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
| 6 */ | 6 */ |
| 7 | 7 |
| 8 #ifndef GrBackendProcessorFactory_DEFINED | 8 #ifndef GrBackendProcessorFactory_DEFINED |
| 9 #define GrBackendProcessorFactory_DEFINED | 9 #define GrBackendProcessorFactory_DEFINED |
| 10 | 10 |
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| 42 } | 42 } |
| 43 | 43 |
| 44 size_t size() const { return sizeof(uint32_t) * fCount; } | 44 size_t size() const { return sizeof(uint32_t) * fCount; } |
| 45 | 45 |
| 46 private: | 46 private: |
| 47 SkTArray<uint8_t, true>* fData; // unowned ptr to the larger key. | 47 SkTArray<uint8_t, true>* fData; // unowned ptr to the larger key. |
| 48 int fCount; // number of uint32_ts added to fData by the
processor. | 48 int fCount; // number of uint32_ts added to fData by the
processor. |
| 49 }; | 49 }; |
| 50 | 50 |
| 51 /** | 51 /** |
| 52 * This class is used to pass the key that was created for a GrGLProcessor back
to it | |
| 53 * when it emits code. It may allow the emit step to skip calculations that were | |
| 54 * performed when computing the key. | |
| 55 */ | |
| 56 class GrProcessorKey { | |
| 57 public: | |
| 58 GrProcessorKey(const uint32_t* key, int count) : fKey(key), fCount(count) { | |
| 59 SkASSERT(0 == reinterpret_cast<intptr_t>(key) % sizeof(uint32_t)); | |
| 60 } | |
| 61 | |
| 62 /** Gets the uint32_t values that the processor inserted into the key. */ | |
| 63 uint32_t get32(int index) const { | |
| 64 SkASSERT(index >=0 && index < fCount); | |
| 65 return fKey[index]; | |
| 66 } | |
| 67 | |
| 68 /** Gets the number of uint32_t values that the processor inserted into the
key. */ | |
| 69 int count32() const { return fCount; } | |
| 70 | |
| 71 private: | |
| 72 const uint32_t* fKey; // unowned ptr into the larger key. | |
| 73 int fCount; // number of uint32_ts inserted by the proce
ssor into its key. | |
| 74 }; | |
| 75 | |
| 76 /** | |
| 77 * Given a GrProcessor of a particular type, creates the corresponding graphics-
backend-specific | 52 * Given a GrProcessor of a particular type, creates the corresponding graphics-
backend-specific |
| 78 * processor object. It also tracks equivalence of shaders generated via a key.
The factory for an | 53 * processor object. It also tracks equivalence of shaders generated via a key.
The factory for an |
| 79 * processor is accessed via GrProcessor::getFactory(). Each factory instance is
assigned an ID at | 54 * processor is accessed via GrProcessor::getFactory(). Each factory instance is
assigned an ID at |
| 80 * construction. The ID of GrProcessor::getFactory() is used as a type identifie
r. Thus, a | 55 * construction. The ID of GrProcessor::getFactory() is used as a type identifie
r. Thus, a |
| 81 * GrProcessor subclass must always return the same object from getFactory() and
that factory object | 56 * GrProcessor subclass must always return the same object from getFactory() and
that factory object |
| 82 * must be unique to the GrProcessor subclass (and unique from any further deriv
ed subclasses). | 57 * must be unique to the GrProcessor subclass (and unique from any further deriv
ed subclasses). |
| 83 * | 58 * |
| 84 * Rather than subclassing this class themselves, it is recommended that GrProce
ssor authors use | 59 * Rather than subclassing this class themselves, it is recommended that GrProce
ssor authors use |
| 85 * the templated subclass GrTBackendProcessorFactory by writing their getFactory
() method as: | 60 * the templated subclass GrTBackendProcessorFactory by writing their getFactory
() method as: |
| 86 * | 61 * |
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| 160 class GrBackendGeometryProcessorFactory : public GrBackendProcessorFactory { | 135 class GrBackendGeometryProcessorFactory : public GrBackendProcessorFactory { |
| 161 public: | 136 public: |
| 162 /** | 137 /** |
| 163 * Creates a GrGLProcessor instance that is used both to generate code for t
he GrProcessor in a | 138 * Creates a GrGLProcessor instance that is used both to generate code for t
he GrProcessor in a |
| 164 * GLSL program and to manage updating uniforms for the program when it is u
sed. | 139 * GLSL program and to manage updating uniforms for the program when it is u
sed. |
| 165 */ | 140 */ |
| 166 virtual GrGLGeometryProcessor* createGLInstance(const GrGeometryProcessor&)
const = 0; | 141 virtual GrGLGeometryProcessor* createGLInstance(const GrGeometryProcessor&)
const = 0; |
| 167 }; | 142 }; |
| 168 | 143 |
| 169 #endif | 144 #endif |
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