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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 #include "GrEllipseEdgeEffect.h" | |
9 #include "gl/GrGLEffect.h" | |
10 #include "gl/GrGLSL.h" | |
11 #include "GrTBackendEffectFactory.h" | |
12 | |
13 class GrGLEllipseEdgeEffect : public GrGLEffect { | |
14 public: | |
15 GrGLEllipseEdgeEffect(const GrBackendEffectFactory& factory, const GrDrawEff
ect&) | |
16 : INHERITED (factory) {} | |
17 | |
18 virtual void emitCode(GrGLShaderBuilder* builder, | |
19 const GrDrawEffect& drawEffect, | |
20 EffectKey key, | |
21 const char* outputColor, | |
22 const char* inputColor, | |
23 const TextureSamplerArray& samplers) SK_OVERRIDE { | |
24 const GrEllipseEdgeEffect& ellipseEffect = drawEffect.castEffect<GrEllip
seEdgeEffect>(); | |
25 | |
26 const char *vsCenterName, *fsCenterName; | |
27 const char *vsEdgeName, *fsEdgeName; | |
28 | |
29 builder->addVarying(kVec2f_GrSLType, "EllipseCenter", &vsCenterName, &fs
CenterName); | |
30 const SkString* attr0Name = | |
31 builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[
0]); | |
32 builder->vsCodeAppendf("\t%s = %s;\n", vsCenterName, attr0Name->c_str())
; | |
33 | |
34 builder->addVarying(kVec4f_GrSLType, "EllipseEdge", &vsEdgeName, &fsEdge
Name); | |
35 const SkString* attr1Name = | |
36 builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[
1]); | |
37 builder->vsCodeAppendf("\t%s = %s;\n", vsEdgeName, attr1Name->c_str()); | |
38 | |
39 // translate to origin | |
40 builder->fsCodeAppendf("\tvec2 outerOffset = (%s.xy - %s.xy);\n", | |
41 builder->fragmentPosition(), fsCenterName); | |
42 builder->fsCodeAppend("\tvec2 innerOffset = outerOffset;\n"); | |
43 // scale y by xRadius/yRadius | |
44 builder->fsCodeAppendf("\touterOffset.y *= %s.y;\n", fsEdgeName); | |
45 builder->fsCodeAppend("\tfloat dOuter = length(outerOffset);\n"); | |
46 // compare outer lengths against xOuterRadius | |
47 builder->fsCodeAppendf("\tfloat edgeAlpha = clamp(%s.x-dOuter, 0.0, 1.0)
;\n", fsEdgeName); | |
48 | |
49 if (ellipseEffect.isStroked()) { | |
50 builder->fsCodeAppendf("\tinnerOffset.y *= %s.w;\n", fsEdgeName); | |
51 builder->fsCodeAppend("\tfloat dInner = length(innerOffset);\n"); | |
52 | |
53 // compare inner lengths against xInnerRadius | |
54 builder->fsCodeAppendf("\tfloat innerAlpha = clamp(dInner-%s.z, 0.0,
1.0);\n", fsEdgeName); | |
55 builder->fsCodeAppend("\tedgeAlpha *= innerAlpha;\n"); | |
56 } | |
57 | |
58 SkString modulate; | |
59 GrGLSLModulate4f(&modulate, inputColor, "edgeAlpha"); | |
60 builder->fsCodeAppendf("\t%s = %s;\n", outputColor, modulate.c_str()); | |
61 } | |
62 | |
63 static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCap
s&) { | |
64 const GrEllipseEdgeEffect& ellipseEffect = drawEffect.castEffect<GrEllip
seEdgeEffect>(); | |
65 | |
66 return ellipseEffect.isStroked() ? 0x1 : 0x0; | |
67 } | |
68 | |
69 virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVER
RIDE { | |
70 } | |
71 | |
72 private: | |
73 typedef GrGLEffect INHERITED; | |
74 }; | |
75 | |
76 /////////////////////////////////////////////////////////////////////////////// | |
77 | |
78 GrEllipseEdgeEffect::GrEllipseEdgeEffect(bool stroke) : GrEffect() { | |
79 this->addVertexAttrib(kVec2f_GrSLType); | |
80 this->addVertexAttrib(kVec4f_GrSLType); | |
81 | |
82 fStroke = stroke; | |
83 } | |
84 | |
85 void GrEllipseEdgeEffect::getConstantColorComponents(GrColor* color, uint32_t* v
alidFlags) const { | |
86 *validFlags = 0; | |
87 } | |
88 | |
89 const GrBackendEffectFactory& GrEllipseEdgeEffect::getFactory() const { | |
90 return GrTBackendEffectFactory<GrEllipseEdgeEffect>::getInstance(); | |
91 } | |
92 | |
93 /////////////////////////////////////////////////////////////////////////////// | |
94 | |
95 GR_DEFINE_EFFECT_TEST(GrEllipseEdgeEffect); | |
96 | |
97 GrEffectRef* GrEllipseEdgeEffect::TestCreate(SkMWCRandom* random, | |
98 GrContext* context, | |
99 const GrDrawTargetCaps&, | |
100 GrTexture* textures[]) { | |
101 return GrEllipseEdgeEffect::Create(random->nextBool()); | |
102 } | |
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