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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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Chromium Code Reviews
Issue 13344002:
Move edge GrEffects to locally defined classes (Closed)
Base URL: http://skia.googlecode.com/svn/trunk/