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1 /* | |
2 * Copyright 2014 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 GrGLFullProgramBuilder_DEFINED | |
9 #define GrGLFullProgramBuilder_DEFINED | |
10 | |
11 #include "GrGLProgramBuilder.h" | |
12 #include "../GrGLGeometryProcessor.h" | |
13 | |
14 class GrGLVertexProgramEffects; | |
15 | |
16 class GrGLFullProgramBuilder : public GrGLProgramBuilder { | |
17 public: | |
18 GrGLFullProgramBuilder(GrGpuGL*, const GrOptDrawState&, const GrGLProgramDes
c&); | |
19 | |
20 /** Add a varying variable to the current program to pass values between vert
ex and fragment | |
21 shaders. If the last two parameters are non-NULL, they are filled in wit
h the name | |
22 generated. */ | |
23 void addVarying(GrSLType type, | |
24 const char* name, | |
25 const char** vsOutName = NULL, | |
26 const char** fsInName = NULL, | |
27 GrGLShaderVar::Precision fsPrecision=GrGLShaderVar::kDefault
_Precision); | |
28 | |
29 /** Add a separable varying input variable to the current program. | |
30 * A separable varying (fragment shader input) is a varying that can be used
also when vertex | |
31 * shaders are not used. With a vertex shader, the operation is same as with
other | |
32 * varyings. Without a vertex shader, such as with NV_path_rendering, GL API
s are used to | |
33 * populate the variable. The APIs can refer to the variable through the ret
urned handle. | |
34 */ | |
35 VaryingHandle addSeparableVarying(GrSLType type, | |
36 const char* name, | |
37 const char** vsOutName, | |
38 const char** fsInName); | |
39 | |
40 GrGLVertexShaderBuilder* getVertexShaderBuilder() { return &fVS; } | |
41 | |
42 /* | |
43 * This non-virtual call will hide the parent call to prevent GPs from acces
sing fragment shader | |
44 * functionality they shouldn't be using | |
45 */ | |
46 GrGLProcessorFragmentShaderBuilder* getFragmentShaderBuilder() { return &fFS
; } | |
47 | |
48 private: | |
49 virtual void createAndEmitEffects(const GrGeometryStage* geometryProcessor, | |
50 const GrFragmentStage* colorStages[], | |
51 const GrFragmentStage* coverageStages[], | |
52 GrGLSLExpr4* inputColor, | |
53 GrGLSLExpr4* inputCoverage) SK_OVERRIDE; | |
54 | |
55 GrGLProgramEffects* onCreateAndEmitEffects(const GrFragmentStage* effectStag
es[], | |
56 int effectCnt, | |
57 const GrGLProgramDesc::EffectKeyP
rovider&, | |
58 GrGLSLExpr4* inOutFSColor); | |
59 | |
60 class GrGLGeometryProcessorEmitter : public GrGLProgramBuilder::GrGLProcesso
rEmitterInterface { | |
61 public: | |
62 GrGLGeometryProcessorEmitter(GrGLFullProgramBuilder* builder) | |
63 : fBuilder(builder) | |
64 , fGeometryProcessor(NULL) | |
65 , fGLGeometryProcessor(NULL) {} | |
66 virtual ~GrGLGeometryProcessorEmitter() {} | |
67 void set(const GrGeometryProcessor* gp) { | |
68 SkASSERT(NULL == fGeometryProcessor); | |
69 fGeometryProcessor = gp; | |
70 } | |
71 virtual GrGLProcessor* createGLInstance() { | |
72 SkASSERT(fGeometryProcessor); | |
73 SkASSERT(NULL == fGLGeometryProcessor); | |
74 fGLGeometryProcessor = | |
75 fGeometryProcessor->getFactory().createGLInstance(*fGeom
etryProcessor); | |
76 return fGLGeometryProcessor; | |
77 } | |
78 virtual void emit(const GrProcessorKey& key, | |
79 const char* outColor, | |
80 const char* inColor, | |
81 const GrGLProcessor::TransformedCoordsArray& coord
s, | |
82 const GrGLProcessor::TextureSamplerArray& samplers
) { | |
83 SkASSERT(fGeometryProcessor); | |
84 SkASSERT(fGLGeometryProcessor); | |
85 fGLGeometryProcessor->emitCode(fBuilder, *fGeometryProcessor, ke
y, outColor, | |
86 inColor, coords, samplers); | |
87 // this will not leak because it has already been used by create
GLInstance | |
88 fGLGeometryProcessor = NULL; | |
89 fGeometryProcessor = NULL; | |
90 } | |
91 private: | |
92 GrGLFullProgramBuilder* fBuilder; | |
93 const GrGeometryProcessor* fGeometryProcessor; | |
94 GrGLGeometryProcessor* fGLGeometryProcessor; | |
95 }; | |
96 | |
97 virtual void emitEffect(const GrProcessorStage& stage, | |
98 const GrProcessorKey& key, | |
99 const char* outColor, | |
100 const char* inColor, | |
101 int stageIndex) SK_OVERRIDE; | |
102 | |
103 /** | |
104 * Helper for emitEffect(). Emits code to implement an effect's coord transf
orms in the VS. | |
105 * Varyings are added as an outputs of the VS and inputs to the FS. The vary
ings may be either a | |
106 * vec2f or vec3f depending upon whether perspective interpolation is requir
ed or not. The names | |
107 * of the varyings in the VS and FS as well their types are appended to the | |
108 * TransformedCoordsArray* object, which is in turn passed to the effect's e
mitCode() function. | |
109 */ | |
110 void emitTransforms(const GrProcessorStage& effectStage, | |
111 GrGLProcessor::TransformedCoordsArray* outCoords); | |
112 | |
113 virtual bool compileAndAttachShaders(GrGLuint programId, | |
114 SkTDArray<GrGLuint>* shaderIds) const S
K_OVERRIDE; | |
115 | |
116 virtual void bindProgramLocations(GrGLuint programId) SK_OVERRIDE; | |
117 | |
118 virtual GrGLProgramEffects* getProgramEffects() SK_OVERRIDE { return fProgra
mEffects.get(); } | |
119 | |
120 typedef GrGLProgramDesc::EffectKeyProvider EffectKeyProvider; | |
121 | |
122 GrGLGeometryProcessorEmitter fGLGeometryProcessorEmitter; | |
123 GrGLGeometryShaderBuilder fGS; | |
124 GrGLVertexShaderBuilder fVS; | |
125 SkAutoTDelete<GrGLVertexProgramEffects> fProgramEffects; | |
126 | |
127 typedef GrGLProgramBuilder INHERITED; | |
128 }; | |
129 | |
130 #endif | |
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