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Side by Side Diff: src/gpu/effects/GrRectEffect.cpp

Issue 13521006: First pass at Rect Effect (Closed) Base URL: http://skia.googlecode.com/svn/trunk/
Patch Set: fixed overlength lines Created 7 years, 8 months ago
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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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