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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrCircleEdgeEffect.h"
#include "gl/GrGLEffect.h"
#include "gl/GrGLSL.h"
#include "GrTBackendEffectFactory.h"
class GrGLCircleEdgeEffect : public GrGLEffect {
public:
GrGLCircleEdgeEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
: INHERITED (factory) {}
virtual void emitCode(GrGLShaderBuilder* builder,
const GrDrawEffect& drawEffect,
EffectKey key,
const char* outputColor,
const char* inputColor,
const TextureSamplerArray& samplers) SK_OVERRIDE {
const GrCircleEdgeEffect& circleEffect = drawEffect.castEffect<GrCircleEdgeEffect>();
const char *vsName, *fsName;
builder->addVarying(kVec4f_GrSLType, "CircleEdge", &vsName, &fsName);
const SkString* attrName =
builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
builder->vsCodeAppendf("\t%s = %s;\n", vsName, attrName->c_str());
builder->fsCodeAppendf("\tfloat d = distance(%s.xy, %s.xy);\n",
builder->fragmentPosition(), fsName);
builder->fsCodeAppendf("\tfloat edgeAlpha = clamp(%s.z - d, 0.0, 1.0);\n", fsName);
if (circleEffect.isStroked()) {
builder->fsCodeAppendf("\tfloat innerAlpha = clamp(d - %s.w, 0.0, 1.0);\n", fsName);
builder->fsCodeAppend("\tedgeAlpha *= innerAlpha;\n");
}
SkString modulate;
GrGLSLModulate4f(&modulate, inputColor, "edgeAlpha");
builder->fsCodeAppendf("\t%s = %s;\n", outputColor, modulate.c_str());
}
static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
const GrCircleEdgeEffect& circleEffect = drawEffect.castEffect<GrCircleEdgeEffect>();
return circleEffect.isStroked() ? 0x1 : 0x0;
}
virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE {
}
private:
typedef GrGLEffect INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
GrCircleEdgeEffect::GrCircleEdgeEffect(bool stroke) : GrEffect() {
this->addVertexAttrib(kVec4f_GrSLType);
fStroke = stroke;
}
void GrCircleEdgeEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
*validFlags = 0;
}
const GrBackendEffectFactory& GrCircleEdgeEffect::getFactory() const {
return GrTBackendEffectFactory<GrCircleEdgeEffect>::getInstance();
}
///////////////////////////////////////////////////////////////////////////////
GR_DEFINE_EFFECT_TEST(GrCircleEdgeEffect);
GrEffectRef* GrCircleEdgeEffect::TestCreate(SkMWCRandom* random,
GrContext* context,
GrTexture* textures[]) {
return GrCircleEdgeEffect::Create(random->nextBool());
}
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