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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
* This file was autogenerated from GrEllipseEffect.fp; do not modify.
*/
#include "GrEllipseEffect.h"
#if SK_SUPPORT_GPU
#include "glsl/GrGLSLColorSpaceXformHelper.h"
#include "glsl/GrGLSLFragmentProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLProgramBuilder.h"
#include "SkSLCPP.h"
#include "SkSLUtil.h"
class GrGLSLEllipseEffect : public GrGLSLFragmentProcessor {
public:
GrGLSLEllipseEffect() {}
void emitCode(EmitArgs& args) override {
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
const GrEllipseEffect& _outer = args.fFp.cast<GrEllipseEffect>();
(void)_outer;
prevRadii = vec2(-1.0);
useScale = sk_Caps.floatPrecisionVaries;
fEllipseVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kVec4f_GrSLType,
kHigh_GrSLPrecision, "ellipse");
if (useScale) {
fScaleVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kVec2f_GrSLType,
kDefault_GrSLPrecision, "scale");
}
fragBuilder->codeAppendf(
"vec2 prevCenter;\nvec2 prevRadii = vec2(%f, %f);\nbool useScale = %s;\nvec2 d = "
"sk_FragCoord.xy - %s.xy;\n@if (useScale) {\n d *= %s.y;\n}\nvec2 Z = d * "
"%s.zw;\nfloat implicit = dot(Z, d) - 1.0;\nfloat grad_dot = 4.0 * dot(Z, "
"Z);\ngrad_dot = max(grad_dot, 0.0001);\nfloat approx_dist = implicit * "
"inversesqrt(grad_dot);\n@if (useScale) {\n approx_dist *= %s.x;\n}\nfloat "
"alpha;\n@switch (%d) {\n case 0:\n alpha = approx_dist > 0.0 ? 0.0 : "
"1.0;\n break;\n case 1:\n alpha = clamp(0.5 - approx_dist, 0.0, "
"1.0);\n break;\n case 2:\n alpha = approx_dist > 0.0 ? 1.0 : "
"0.0;\n break;\n case 3:\n alpha = clamp(0.5 + approx_dist, 0.0, "
"1.0);\n break;\n default:\n discard;\n}\n%s = %s * alpha;\n",
prevRadii.fX, prevRadii.fY, (useScale ? "true" : "false"),
args.fUniformHandler->getUniformCStr(fEllipseVar),
fScaleVar.isValid() ? args.fUniformHandler->getUniformCStr(fScaleVar) : "vec2(0.0)",
args.fUniformHandler->getUniformCStr(fEllipseVar),
fScaleVar.isValid() ? args.fUniformHandler->getUniformCStr(fScaleVar) : "vec2(0.0)",
_outer.edgeType(), args.fOutputColor,
args.fInputColor ? args.fInputColor : "vec4(1)");
}
private:
void onSetData(const GrGLSLProgramDataManager& pdman,
const GrFragmentProcessor& _proc) override {
const GrEllipseEffect& _outer = _proc.cast<GrEllipseEffect>();
auto edgeType = _outer.edgeType();
(void)edgeType;
auto center = _outer.center();
(void)center;
auto radii = _outer.radii();
(void)radii;
UniformHandle& ellipse = fEllipseVar;
(void)ellipse;
UniformHandle& scale = fScaleVar;
(void)scale;
if (radii != prevRadii || center != prevCenter) {
float invRXSqd;
float invRYSqd;
if (scale.isValid()) {
if (radii.fX > radii.fY) {
invRXSqd = 1.f;
invRYSqd = (radii.fX * radii.fX) / (radii.fY * radii.fY);
pdman.set2f(scale, radii.fX, 1.f / radii.fX);
} else {
invRXSqd = (radii.fY * radii.fY) / (radii.fX * radii.fX);
invRYSqd = 1.f;
pdman.set2f(scale, radii.fY, 1.f / radii.fY);
}
} else {
invRXSqd = 1.f / (radii.fX * radii.fX);
invRYSqd = 1.f / (radii.fY * radii.fY);
}
pdman.set4f(ellipse, center.fX, center.fY, invRXSqd, invRYSqd);
prevCenter = center;
prevRadii = radii;
}
}
SkPoint prevCenter;
SkPoint prevRadii;
bool useScale;
UniformHandle fEllipseVar;
UniformHandle fScaleVar;
};
GrGLSLFragmentProcessor* GrEllipseEffect::onCreateGLSLInstance() const {
return new GrGLSLEllipseEffect();
}
void GrEllipseEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps,
GrProcessorKeyBuilder* b) const {
b->add32(fEdgeType);
}
bool GrEllipseEffect::onIsEqual(const GrFragmentProcessor& other) const {
const GrEllipseEffect& that = other.cast<GrEllipseEffect>();
(void)that;
if (fEdgeType != that.fEdgeType) return false;
if (fCenter != that.fCenter) return false;
if (fRadii != that.fRadii) return false;
return true;
}
GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrEllipseEffect);
#if GR_TEST_UTILS
sk_sp<GrFragmentProcessor> GrEllipseEffect::TestCreate(GrProcessorTestData* testData) {
SkPoint center;
center.fX = testData->fRandom->nextRangeScalar(0.f, 1000.f);
center.fY = testData->fRandom->nextRangeScalar(0.f, 1000.f);
SkScalar rx = testData->fRandom->nextRangeF(0.f, 1000.f);
SkScalar ry = testData->fRandom->nextRangeF(0.f, 1000.f);
GrPrimitiveEdgeType et;
do {
et = (GrPrimitiveEdgeType)testData->fRandom->nextULessThan(kGrProcessorEdgeTypeCnt);
} while (kHairlineAA_GrProcessorEdgeType == et);
return GrEllipseEffect::Make(et, center, SkPoint::Make(rx, ry));
}
#endif
#endif
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