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Side by Side Diff: src/gpu/gl/GrGLEffect.h

Issue 577593003: Revert of removing GrDrawEffect (Closed) Base URL: https://skia.googlesource.com/skia.git@gp3
Patch Set: Created 6 years, 3 months ago
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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 GrGLEffect_DEFINED 8 #ifndef GrGLEffect_DEFINED
9 #define GrGLEffect_DEFINED 9 #define GrGLEffect_DEFINED
10 10
11 #include "GrBackendEffectFactory.h" 11 #include "GrBackendEffectFactory.h"
12 #include "GrGLProgramEffects.h" 12 #include "GrGLProgramEffects.h"
13 #include "GrGLShaderVar.h" 13 #include "GrGLShaderVar.h"
14 #include "GrGLSL.h" 14 #include "GrGLSL.h"
15 15
16 class GrGLShaderBuilder; 16 class GrGLShaderBuilder;
17 17
18 /** @file 18 /** @file
19 This file contains specializations for OpenGL of the shader stages declared in 19 This file contains specializations for OpenGL of the shader stages declared in
20 include/gpu/GrEffect.h. Objects of type GrGLEffect are responsible for emitt ing the 20 include/gpu/GrEffect.h. Objects of type GrGLEffect are responsible for emitt ing the
21 GLSL code that implements a GrEffect and for uploading uniforms at draw time . If they don't 21 GLSL code that implements a GrEffect and for uploading uniforms at draw time . If they don't
22 always emit the same GLSL code, they must have a function: 22 always emit the same GLSL code, they must have a function:
23 static inline void GenKey(const GrEffect&, const GrGLCaps&, GrEffectKeyB uilder*) 23 static inline void GenKey(const GrDrawEffect&, const GrGLCaps&, GrEffect KeyBuilder*)
24 that is used to implement a program cache. When two GrEffects produce the sa me key this means 24 that is used to implement a program cache. When two GrEffects produce the sa me key this means
25 that their GrGLEffects would emit the same GLSL code. 25 that their GrGLEffects would emit the same GLSL code.
26 26
27 The GrGLEffect subclass must also have a constructor of the form: 27 The GrGLEffect subclass must also have a constructor of the form:
28 EffectSubclass::EffectSubclass(const GrBackendEffectFactory&, const GrEf fect&) 28 EffectSubclass::EffectSubclass(const GrBackendEffectFactory&, const GrDr awEffect&)
29 The effect held by the GrDrawEffect is guaranteed to be of the type that gen erated the
30 GrGLEffect subclass instance.
29 31
30 These objects are created by the factory object returned by the GrEffect::ge tFactory(). 32 These objects are created by the factory object returned by the GrEffect::ge tFactory().
31 */ 33 */
32 34
35 class GrDrawEffect;
33 class GrGLTexture; 36 class GrGLTexture;
34 class GrGLGeometryProcessor; 37 class GrGLGeometryProcessor;
35 38
36 class GrGLEffect { 39 class GrGLEffect {
37 40
38 public: 41 public:
39 typedef GrGLProgramEffects::TransformedCoordsArray TransformedCoordsArray; 42 typedef GrGLProgramEffects::TransformedCoordsArray TransformedCoordsArray;
40 typedef GrGLProgramEffects::TextureSampler TextureSampler; 43 typedef GrGLProgramEffects::TextureSampler TextureSampler;
41 typedef GrGLProgramEffects::TextureSamplerArray TextureSamplerArray; 44 typedef GrGLProgramEffects::TextureSamplerArray TextureSamplerArray;
42 45
43 GrGLEffect(const GrBackendEffectFactory& factory) 46 GrGLEffect(const GrBackendEffectFactory& factory)
44 : fFactory(factory) 47 : fFactory(factory)
45 , fIsVertexEffect(false) { 48 , fIsVertexEffect(false) {
46 } 49 }
47 50
48 virtual ~GrGLEffect() {} 51 virtual ~GrGLEffect() {}
49 52
50 /** Called when the program stage should insert its code into the shaders. T he code in each 53 /** Called when the program stage should insert its code into the shaders. T he code in each
51 shader will be in its own block ({}) and so locally scoped names will no t collide across 54 shader will be in its own block ({}) and so locally scoped names will no t collide across
52 stages. 55 stages.
53 56
54 @param builder Interface used to emit code in the shaders. 57 @param builder Interface used to emit code in the shaders.
55 @param effect The effect that generated this program stage. 58 @param drawEffect A wrapper on the effect that generated this program stage.
56 @param key The key that was computed by GenKey() from the gener ating GrEffect. 59 @param key The key that was computed by GenKey() from the gener ating GrEffect.
57 @param outputColor A predefined vec4 in the FS in which the stage shoul d place its output 60 @param outputColor A predefined vec4 in the FS in which the stage shoul d place its output
58 color (or coverage). 61 color (or coverage).
59 @param inputColor A vec4 that holds the input color to the stage in th e FS. This may be 62 @param inputColor A vec4 that holds the input color to the stage in th e FS. This may be
60 NULL in which case the implied input is solid white (all ones). 63 NULL in which case the implied input is solid white (all ones).
61 TODO: Better system for communicating optimization i nfo (e.g. input 64 TODO: Better system for communicating optimization i nfo (e.g. input
62 color is solid white, trans black, known to be opaqu e, etc.) that allows 65 color is solid white, trans black, known to be opaqu e, etc.) that allows
63 the effect to communicate back similar known info ab out its output. 66 the effect to communicate back similar known info ab out its output.
64 @param samplers One entry for each GrTextureAccess of the GrEffect t hat generated the 67 @param samplers One entry for each GrTextureAccess of the GrEffect t hat generated the
65 GrGLEffect. These can be passed to the builder to em it texture 68 GrGLEffect. These can be passed to the builder to em it texture
66 reads in the generated code. 69 reads in the generated code.
67 */ 70 */
68 virtual void emitCode(GrGLProgramBuilder* builder, 71 virtual void emitCode(GrGLProgramBuilder* builder,
69 const GrEffect& effect, 72 const GrDrawEffect& drawEffect,
70 const GrEffectKey& key, 73 const GrEffectKey& key,
71 const char* outputColor, 74 const char* outputColor,
72 const char* inputColor, 75 const char* inputColor,
73 const TransformedCoordsArray& coords, 76 const TransformedCoordsArray& coords,
74 const TextureSamplerArray& samplers) = 0; 77 const TextureSamplerArray& samplers) = 0;
75 78
76 /** A GrGLEffect instance can be reused with any GrEffect that produces the same stage 79 /** A GrGLEffect instance can be reused with any GrEffect that produces the same stage
77 key; this function reads data from a GrEffect and uploads any uniform va riables required 80 key; this function reads data from a GrEffect and uploads any uniform va riables required
78 by the shaders created in emitCode(). The GrEffect is 81 by the shaders created in emitCode(). The GrEffect installed in the GrDr awEffect is
79 guaranteed to be of the same type that created this GrGLEffect and to ha ve an identical 82 guaranteed to be of the same type that created this GrGLEffect and to ha ve an identical
80 effect key as the one that created this GrGLEffect. Effects that use loc al coords have 83 effect key as the one that created this GrGLEffect. Effects that use loc al coords have
81 to consider whether the GrEffectStage's coord change matrix should be us ed. When explicit 84 to consider whether the GrEffectStage's coord change matrix should be us ed. When explicit
82 local coordinates are used it can be ignored. */ 85 local coordinates are used it can be ignored. */
83 virtual void setData(const GrGLProgramDataManager&, const GrEffect&) {} 86 virtual void setData(const GrGLProgramDataManager&, const GrDrawEffect&) {}
84 87
85 const char* name() const { return fFactory.name(); } 88 const char* name() const { return fFactory.name(); }
86 89
87 static void GenKey(const GrEffect&, const GrGLCaps&, GrEffectKeyBuilder*) {} 90 static void GenKey(const GrDrawEffect&, const GrGLCaps&, GrEffectKeyBuilder* ) {}
88 91
89 /** Used by the system when generating shader code, to see if this effect ca n be downcasted to 92 /** Used by the system when generating shader code, to see if this effect ca n be downcasted to
90 the internal GrGLGeometryProcessor type */ 93 the internal GrGLGeometryProcessor type */
91 bool isVertexEffect() const { return fIsVertexEffect; } 94 bool isVertexEffect() const { return fIsVertexEffect; }
92 95
93 protected: 96 protected:
94 const GrBackendEffectFactory& fFactory; 97 const GrBackendEffectFactory& fFactory;
95 98
96 private: 99 private:
97 friend class GrGLGeometryProcessor; // to set fIsVertexEffect 100 friend class GrGLGeometryProcessor; // to set fIsVertexEffect
98 101
99 bool fIsVertexEffect; 102 bool fIsVertexEffect;
100 }; 103 };
101 104
102 #endif 105 #endif
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