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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"
#include "glsl/GrGLSLFragmentProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLProgramBuilder.h"
#include "GrTexture.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;
auto edgeType = _outer.edgeType();
(void)edgeType;
auto center = _outer.center();
(void)center;
auto radii = _outer.radii();
(void)radii;
prevRadii = float2(-1.0);
useScale = !sk_Caps.floatIs32Bits;
fEllipseVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kFloat4_GrSLType,
kDefault_GrSLPrecision, "ellipse");
if (useScale) {
fScaleVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kFloat2_GrSLType,
kDefault_GrSLPrecision, "scale");
}
fragBuilder->codeAppendf(
"float2 prevCenter;\nfloat2 prevRadii = float2(%f, %f);\nbool useScale = "
"%s;\nfloat2 d = sk_FragCoord.xy - %s.xy;\n@if (useScale) {\n d *= "
"%s.y;\n}\nfloat2 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}\nhalf alpha;\n@switch (%d) {\n case 0:\n alpha = "
"half(approx_dist > 0.0 ? 0.0 : 1.0);\n break;\n case 1:\n ",
prevRadii.fX, prevRadii.fY, (useScale ? "true" : "false"),
args.fUniformHandler->getUniformCStr(fEllipseVar),
fScaleVar.isValid() ? args.fUniformHandler->getUniformCStr(fScaleVar) : "float2(0)",
args.fUniformHandler->getUniformCStr(fEllipseVar),
fScaleVar.isValid() ? args.fUniformHandler->getUniformCStr(fScaleVar) : "float2(0)",
(int)_outer.edgeType());
fragBuilder->codeAppendf(
" alpha = half(clamp(0.5 - approx_dist, 0.0, 1.0));\n break;\n case "
"2:\n alpha = half(approx_dist > 0.0 ? 1.0 : 0.0);\n break;\n "
"case 3:\n alpha = half(clamp(0.5 + approx_dist, 0.0, 1.0));\n "
"break;\n default:\n discard;\n}\n%s = %s * alpha;\n",
args.fOutputColor, args.fInputColor ? args.fInputColor : "half4(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 we're using a scale factor to work around precision issues, choose the larger
// radius as the scale factor. The inv radii need to be pre-adjusted by the scale
// factor.
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 = float2(0);
SkPoint prevRadii = float2(0);
bool useScale = false;
UniformHandle fEllipseVar;
UniformHandle fScaleVar;
};
GrGLSLFragmentProcessor* GrEllipseEffect::onCreateGLSLInstance() const {
return new GrGLSLEllipseEffect();
}
void GrEllipseEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps,
GrProcessorKeyBuilder* b) const {
b->add32((int32_t)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;
}
GrEllipseEffect::GrEllipseEffect(const GrEllipseEffect& src)
: INHERITED(kGrEllipseEffect_ClassID, src.optimizationFlags())
, fEdgeType(src.fEdgeType)
, fCenter(src.fCenter)
, fRadii(src.fRadii) {}
std::unique_ptr<GrFragmentProcessor> GrEllipseEffect::clone() const {
return std::unique_ptr<GrFragmentProcessor>(new GrEllipseEffect(*this));
}
GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrEllipseEffect);
#if GR_TEST_UTILS
std::unique_ptr<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);
GrClipEdgeType et;
do {
et = (GrClipEdgeType)testData->fRandom->nextULessThan(kGrClipEdgeTypeCnt);
} while (GrClipEdgeType::kHairlineAA == et);
return GrEllipseEffect::Make(et, center, SkPoint::Make(rx, ry),
*testData->caps()->shaderCaps());
}
#endif
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