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1 /* | 1 /* |
2 * Copyright 2014 Google Inc. | 2 * Copyright 2014 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 #include "GrDitherEffect.h" | 8 #include "GrDitherEffect.h" |
9 | 9 |
10 #include "gl/GrGLEffect.h" | 10 #include "gl/GrGLEffect.h" |
11 #include "gl/GrGLSL.h" | 11 #include "gl/GrGLSL.h" |
12 #include "GrTBackendEffectFactory.h" | 12 #include "GrTBackendEffectFactory.h" |
13 | 13 |
14 #include "SkRect.h" | 14 #include "SkRect.h" |
15 | 15 |
16 ////////////////////////////////////////////////////////////////////////////// | 16 ////////////////////////////////////////////////////////////////////////////// |
17 | 17 |
18 class GLDitherEffect; | 18 class GLDitherEffect; |
19 | 19 |
20 class DitherEffect : public GrEffect { | 20 class DitherEffect : public GrEffect { |
21 public: | 21 public: |
22 static GrEffectRef* Create() { | 22 static GrEffect* Create() { |
23 GR_CREATE_STATIC_EFFECT(gDitherEffect, DitherEffect, ()) | 23 GR_CREATE_STATIC_EFFECT(gDitherEffect, DitherEffect, ()) |
24 return SkRef(gDitherEffect); | 24 return SkRef(gDitherEffect); |
25 } | 25 } |
26 | 26 |
27 virtual ~DitherEffect() {}; | 27 virtual ~DitherEffect() {}; |
28 static const char* Name() { return "Dither"; } | 28 static const char* Name() { return "Dither"; } |
29 | 29 |
30 typedef GLDitherEffect GLEffect; | 30 typedef GLDitherEffect GLEffect; |
31 | 31 |
32 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags
) const SK_OVERRIDE; | 32 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags
) const SK_OVERRIDE; |
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49 }; | 49 }; |
50 | 50 |
51 void DitherEffect::getConstantColorComponents(GrColor* color, uint32_t* validFla
gs) const { | 51 void DitherEffect::getConstantColorComponents(GrColor* color, uint32_t* validFla
gs) const { |
52 *validFlags = 0; | 52 *validFlags = 0; |
53 } | 53 } |
54 | 54 |
55 ////////////////////////////////////////////////////////////////////////////// | 55 ////////////////////////////////////////////////////////////////////////////// |
56 | 56 |
57 GR_DEFINE_EFFECT_TEST(DitherEffect); | 57 GR_DEFINE_EFFECT_TEST(DitherEffect); |
58 | 58 |
59 GrEffectRef* DitherEffect::TestCreate(SkRandom*, | 59 GrEffect* DitherEffect::TestCreate(SkRandom*, |
60 GrContext*, | 60 GrContext*, |
61 const GrDrawTargetCaps&, | 61 const GrDrawTargetCaps&, |
62 GrTexture*[]) { | 62 GrTexture*[]) { |
63 return DitherEffect::Create(); | 63 return DitherEffect::Create(); |
64 } | 64 } |
65 | 65 |
66 ////////////////////////////////////////////////////////////////////////////// | 66 ////////////////////////////////////////////////////////////////////////////// |
67 | 67 |
68 class GLDitherEffect : public GrGLEffect { | 68 class GLDitherEffect : public GrGLEffect { |
69 public: | 69 public: |
70 GLDitherEffect(const GrBackendEffectFactory&, const GrDrawEffect&); | 70 GLDitherEffect(const GrBackendEffectFactory&, const GrDrawEffect&); |
71 | 71 |
72 virtual void emitCode(GrGLShaderBuilder* builder, | 72 virtual void emitCode(GrGLShaderBuilder* builder, |
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104 // it up or let it remain constant during quantization. | 104 // it up or let it remain constant during quantization. |
105 builder->fsCodeAppendf("\t\tfloat r = " | 105 builder->fsCodeAppendf("\t\tfloat r = " |
106 "fract(sin(dot(%s.xy ,vec2(12.9898,78.233))) * 43758.
5453);\n", | 106 "fract(sin(dot(%s.xy ,vec2(12.9898,78.233))) * 43758.
5453);\n", |
107 builder->fragmentPosition()); | 107 builder->fragmentPosition()); |
108 builder->fsCodeAppendf("\t\t%s = (1.0/255.0) * vec4(r, r, r, r) + %s;\n", | 108 builder->fsCodeAppendf("\t\t%s = (1.0/255.0) * vec4(r, r, r, r) + %s;\n", |
109 outputColor, GrGLSLExpr4(inputColor).c_str()); | 109 outputColor, GrGLSLExpr4(inputColor).c_str()); |
110 } | 110 } |
111 | 111 |
112 ////////////////////////////////////////////////////////////////////////////// | 112 ////////////////////////////////////////////////////////////////////////////// |
113 | 113 |
114 GrEffectRef* GrDitherEffect::Create() { | 114 GrEffect* GrDitherEffect::Create() { return DitherEffect::Create(); } |
115 return DitherEffect::Create(); | |
116 } | |
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