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1 /* | |
2 * Copyright 2013 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 GrGLProgramEffects_DEFINED | |
9 #define GrGLProgramEffects_DEFINED | |
10 | |
11 #include "GrBackendProcessorFactory.h" | |
12 #include "GrGLProgramDataManager.h" | |
13 #include "GrGpu.h" | |
14 #include "GrTexture.h" | |
15 #include "GrTextureAccess.h" | |
16 | |
17 class GrProcessor; | |
18 class GrProcessorStage; | |
19 class GrGLVertexProgramEffectsBuilder; | |
20 class GrGLProgramBuilder; | |
21 class GrGLFullProgramBuilder; | |
22 class GrGLFragmentOnlyProgramBuilder; | |
23 | |
24 /** | |
25 * This class encapsulates an array of GrGLProcessors and their supporting data
(coord transforms | |
26 * and textures). It is built with GrGLProgramEffectsBuilder, then used to manag
e the necessary GL | |
27 * state and shader uniforms. | |
28 */ | |
29 class GrGLProgramEffects : public SkRefCnt { | |
30 public: | |
31 typedef GrGLProgramDataManager::UniformHandle UniformHandle; | |
32 typedef GrGLProgramDataManager::VaryingHandle VaryingHandle; | |
33 virtual ~GrGLProgramEffects(); | |
34 | |
35 /** | |
36 * Assigns a texture unit to each sampler. It starts on *texUnitIdx and writ
es the next | |
37 * available unit to *texUnitIdx when it returns. | |
38 */ | |
39 void initSamplers(const GrGLProgramDataManager&, int* texUnitIdx); | |
40 | |
41 /** | |
42 * Calls setData() on each effect, and sets their transformation matrices an
d texture bindings. | |
43 */ | |
44 virtual void setData(GrGpuGL*, | |
45 GrGpu::DrawType, | |
46 const GrGLProgramDataManager&, | |
47 const GrGeometryStage* effectStages) { | |
48 SkFAIL("For geometry processor only"); | |
49 } | |
50 | |
51 virtual void setData(GrGpuGL*, | |
52 GrGpu::DrawType, | |
53 const GrGLProgramDataManager&, | |
54 const GrFragmentStage* effectStages[]) = 0; | |
55 | |
56 protected: | |
57 GrGLProgramEffects(int reserveCount) | |
58 : fGLProcessors(reserveCount) | |
59 , fSamplers(reserveCount) { | |
60 } | |
61 | |
62 /** | |
63 * Helper for setData(). Binds all the textures for an effect. | |
64 */ | |
65 void bindTextures(GrGpuGL*, const GrProcessor&, int effectIdx); | |
66 | |
67 struct Sampler { | |
68 SkDEBUGCODE(Sampler() : fTextureUnit(-1) {}) | |
69 UniformHandle fUniform; | |
70 int fTextureUnit; | |
71 }; | |
72 | |
73 /* | |
74 * Helpers for shader builders to build up program effects objects alongside
shader code | |
75 */ | |
76 void addEffect(GrGLProcessor* effect) { fGLProcessors.push_back(effect); } | |
77 SkTArray<Sampler, true>& addSamplers() { return fSamplers.push_back(); } | |
78 | |
79 SkTArray<GrGLProcessor*> fGLProcessors; | |
80 SkTArray<SkSTArray<4, Sampler, true> > fSamplers; | |
81 | |
82 private: | |
83 friend class GrGLProgramBuilder; | |
84 friend class GrGLFullProgramBuilder; | |
85 friend class GrGLFragmentOnlyShaderBuilder; | |
86 | |
87 typedef SkRefCnt INHERITED; | |
88 }; | |
89 | |
90 //////////////////////////////////////////////////////////////////////////////// | |
91 | |
92 /** | |
93 * This is a GrGLProgramEffects implementation that does coord transforms with t
he vertex shader. | |
94 */ | |
95 class GrGLVertexProgramEffects : public GrGLProgramEffects { | |
96 public: | |
97 virtual void setData(GrGpuGL*, | |
98 GrGpu::DrawType, | |
99 const GrGLProgramDataManager&, | |
100 const GrGeometryStage* effectStages) SK_OVERRIDE; | |
101 | |
102 virtual void setData(GrGpuGL*, | |
103 GrGpu::DrawType, | |
104 const GrGLProgramDataManager&, | |
105 const GrFragmentStage* effectStages[]) SK_OVERRIDE; | |
106 | |
107 private: | |
108 GrGLVertexProgramEffects(int reserveCount, bool explicitLocalCoords) | |
109 : INHERITED(reserveCount) | |
110 , fTransforms(reserveCount) | |
111 , fHasExplicitLocalCoords(explicitLocalCoords) { | |
112 } | |
113 | |
114 struct Transform { | |
115 Transform() { fCurrentValue = SkMatrix::InvalidMatrix(); } | |
116 UniformHandle fHandle; | |
117 SkMatrix fCurrentValue; | |
118 }; | |
119 | |
120 struct PathTransform { | |
121 PathTransform() { fCurrentValue = SkMatrix::InvalidMatrix(); } | |
122 VaryingHandle fHandle; | |
123 SkMatrix fCurrentValue; | |
124 GrSLType fType; | |
125 }; | |
126 | |
127 /* | |
128 * These functions are used by the builders to build up program effects alon
g side the shader | |
129 * code itself | |
130 */ | |
131 SkSTArray<2, Transform, true>& addTransforms() { return fTransforms.push_bac
k(); } | |
132 SkTArray<PathTransform, true>& addPathTransforms() { return fPathTransforms.
push_back(); } | |
133 | |
134 /** | |
135 * Helper for setData(). Sets all the transform matrices for an effect. | |
136 */ | |
137 void setDataInternal(GrGpuGL* gpu, | |
138 GrGpu::DrawType drawType, | |
139 const GrGLProgramDataManager& programDataManager, | |
140 const GrProcessorStage& effectStage, | |
141 int index); | |
142 void setTransformData(GrGpuGL* gpu, const GrGLProgramDataManager&, const GrP
rocessorStage&, | |
143 int effectIdx); | |
144 void setPathTransformData(GrGpuGL* gpu, const GrGLProgramDataManager&, | |
145 const GrProcessorStage&, int effectIdx); | |
146 | |
147 | |
148 SkTArray<SkSTArray<2, Transform, true> > fTransforms; | |
149 SkTArray<SkTArray<PathTransform, true> > fPathTransforms; | |
150 bool fHasExplicitLocalCoords; | |
151 | |
152 friend class GrGLFullProgramBuilder; | |
153 | |
154 typedef GrGLProgramEffects INHERITED; | |
155 }; | |
156 | |
157 //////////////////////////////////////////////////////////////////////////////// | |
158 | |
159 /** | |
160 * This is a GrGLProgramEffects implementation that does coord transforms with | |
161 * the the NV_path_rendering PathTexGen functionality. | |
162 */ | |
163 class GrGLPathTexGenProgramEffects : public GrGLProgramEffects { | |
164 public: | |
165 virtual void setData(GrGpuGL*, | |
166 GrGpu::DrawType, | |
167 const GrGLProgramDataManager&, | |
168 const GrFragmentStage* effectStages[]) SK_OVERRIDE; | |
169 | |
170 private: | |
171 GrGLPathTexGenProgramEffects(int reserveCount) | |
172 : INHERITED(reserveCount) | |
173 , fTransforms(reserveCount) { | |
174 } | |
175 | |
176 /** | |
177 * Helper for setData(). Sets the PathTexGen state for each transform in an
effect. | |
178 */ | |
179 void setPathTexGenState(GrGpuGL*, const GrProcessorStage&, int effectIdx); | |
180 | |
181 struct Transforms { | |
182 Transforms(int texCoordIndex) | |
183 : fTexCoordIndex(texCoordIndex) {} | |
184 int fTexCoordIndex; | |
185 }; | |
186 | |
187 /* | |
188 * Helper for fragment only shader builder to build up the program effects a
longside the shader | |
189 */ | |
190 void addTransforms(int coordIndex) { | |
191 fTransforms.push_back(Transforms(coordIndex)); | |
192 } | |
193 | |
194 SkTArray<Transforms> fTransforms; | |
195 | |
196 friend class GrGLFragmentOnlyProgramBuilder; | |
197 | |
198 typedef GrGLProgramEffects INHERITED; | |
199 }; | |
200 | |
201 #endif | |
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