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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 "GrRectEffect.h" | |
9 #include "gl/GrGLEffect.h" | |
10 #include "gl/GrGLEffectMatrix.h" | |
11 #include "gl/GrGLSL.h" | |
12 #include "gl/GrGLTexture.h" | |
13 #include "GrTBackendEffectFactory.h" | |
14 #include "GrTexture.h" | |
15 | |
16 class GrGLRectEffect : public GrGLEffect { | |
17 public: | |
18 GrGLRectEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&) | |
19 : INHERITED (factory) {} | |
20 | |
21 virtual void emitCode(GrGLShaderBuilder* builder, | |
22 const GrDrawEffect& drawEffect, | |
23 EffectKey key, | |
24 const char* outputColor, | |
25 const char* inputColor, | |
26 const TextureSamplerArray& samplers) SK_OVERRIDE { | |
27 // setup the varying for the center point and the unit vector | |
28 // that points down the height of the rect | |
29 const char *vsRectEdgeName, *fsRectEdgeName; | |
30 builder->addVarying(kVec4f_GrSLType, "RectEdge", | |
31 &vsRectEdgeName, &fsRectEdgeName); | |
32 const SkString* attr0Name = | |
33 builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[ 0]); | |
34 builder->vsCodeAppendf("\t%s = %s;\n", vsRectEdgeName, attr0Name->c_str( )); | |
35 | |
36 // setup the varying for width/2+.5 and height/2+.5 | |
37 const char *vsWidthHeightName, *fsWidthHeightName; | |
38 builder->addVarying(kVec2f_GrSLType, "WidthHeight", | |
39 &vsWidthHeightName, &fsWidthHeightName); | |
40 const SkString* attr1Name = | |
41 builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[ 1]); | |
42 builder->vsCodeAppendf("\t%s = %s;\n", vsWidthHeightName, attr1Name->c_s tr()); | |
43 | |
44 // These scale factors adjust the coverage for < 1 pixel wide/high rects | |
45 builder->fsCodeAppendf("\tfloat wScale = max(1.0, 2.0/(0.5+%s.x));\n", f sWidthHeightName); | |
bsalomon
2013/04/08 15:48:39
Do you think it makes sense to do this in the VS?
robertphillips
2013/04/08 19:33:20
Yes but I would like to delay to the next revision
| |
46 builder->fsCodeAppendf("\tfloat hScale = max(1.0, 2.0/(0.5+%s.y));\n", f sWidthHeightName); | |
47 | |
48 // Compute the coverage for the rect's width | |
49 builder->fsCodeAppendf("\tvec2 offset = %s.xy - %s.xy;\n", | |
50 builder->fragmentPosition(), fsRectEdgeName); | |
51 builder->fsCodeAppendf("\tfloat perpDot = abs(offset.x * %s.w - offset.y * %s.z);\n", | |
52 fsRectEdgeName, fsRectEdgeName); | |
53 builder->fsCodeAppendf("\tfloat coverage = clamp(wScale*(%s.x-perpDot), 0.0, 1.0);\n", | |
54 fsWidthHeightName); | |
55 | |
56 // Compute the coverage for the rect's height and merge with the width | |
57 builder->fsCodeAppendf("\tperpDot = abs(dot(offset, %s.zw));\n", | |
58 fsRectEdgeName); | |
59 builder->fsCodeAppendf("\tcoverage = min(coverage, clamp(hScale*(%s.y-pe rpDot), 0.0, 1.0));\n", | |
60 fsWidthHeightName); | |
61 | |
62 SkString modulate; | |
63 GrGLSLModulate4f(&modulate, inputColor, "coverage"); | |
64 builder->fsCodeAppendf("\t%s = %s;\n", outputColor, modulate.c_str()); | |
65 } | |
66 | |
67 static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCap s&) { | |
68 return 0; | |
69 } | |
70 | |
71 virtual void setData(const GrGLUniformManager& uman, const GrDrawEffect&) SK _OVERRIDE { | |
72 } | |
73 | |
74 private: | |
75 typedef GrGLEffect INHERITED; | |
76 }; | |
77 | |
78 /////////////////////////////////////////////////////////////////////////////// | |
79 | |
80 GrRectEffect::GrRectEffect() : GrEffect() { | |
81 this->addVertexAttrib(kVec4f_GrSLType); | |
82 this->addVertexAttrib(kVec2f_GrSLType); | |
83 } | |
84 | |
85 void GrRectEffect::getConstantColorComponents(GrColor* color, uint32_t* validFla gs) const { | |
86 *validFlags = 0; | |
87 } | |
88 | |
89 const GrBackendEffectFactory& GrRectEffect::getFactory() const { | |
90 return GrTBackendEffectFactory<GrRectEffect>::getInstance(); | |
91 } | |
92 | |
93 /////////////////////////////////////////////////////////////////////////////// | |
94 | |
95 GR_DEFINE_EFFECT_TEST(GrRectEffect); | |
96 | |
97 GrEffectRef* GrRectEffect::TestCreate(SkMWCRandom* random, | |
98 GrContext* context, | |
99 const GrDrawTargetCaps&, | |
100 GrTexture* textures[]) { | |
101 return GrRectEffect::Create(); | |
102 } | |
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