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Diffstat (limited to 'src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp')
| -rw-r--r-- | src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp | 1341 |
1 files changed, 1341 insertions, 0 deletions
diff --git a/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp b/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp new file mode 100644 index 0000000000..8402199362 --- /dev/null +++ b/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp @@ -0,0 +1,1341 @@ +/* + * Copyright 2014 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + + +#include "SkTwoPointConicalGradient.h" + +#if SK_SUPPORT_GPU +#include "GrCoordTransform.h" +#include "GrPaint.h" +#include "glsl/GrGLSLFragmentShaderBuilder.h" +#include "glsl/GrGLSLProgramDataManager.h" +#include "glsl/GrGLSLUniformHandler.h" +#include "SkTwoPointConicalGradient_gpu.h" + +// For brevity +typedef GrGLSLProgramDataManager::UniformHandle UniformHandle; + +static const SkScalar kErrorTol = 0.00001f; +static const SkScalar kEdgeErrorTol = 5.f * kErrorTol; + +/** + * We have three general cases for 2pt conical gradients. First we always assume that + * the start radius <= end radius. Our first case (kInside_) is when the start circle + * is completely enclosed by the end circle. The second case (kOutside_) is the case + * when the start circle is either completely outside the end circle or the circles + * overlap. The final case (kEdge_) is when the start circle is inside the end one, + * but the two are just barely touching at 1 point along their edges. + */ +enum ConicalType { + kInside_ConicalType, + kOutside_ConicalType, + kEdge_ConicalType, +}; + +////////////////////////////////////////////////////////////////////////////// + +static void set_matrix_edge_conical(const SkTwoPointConicalGradient& shader, + SkMatrix* invLMatrix) { + // Inverse of the current local matrix is passed in then, + // translate to center1, rotate so center2 is on x axis. + const SkPoint& center1 = shader.getStartCenter(); + const SkPoint& center2 = shader.getEndCenter(); + + invLMatrix->postTranslate(-center1.fX, -center1.fY); + + SkPoint diff = center2 - center1; + SkScalar diffLen = diff.length(); + if (0 != diffLen) { + SkScalar invDiffLen = SkScalarInvert(diffLen); + SkMatrix rot; + rot.setSinCos(-invDiffLen * diff.fY, invDiffLen * diff.fX); + invLMatrix->postConcat(rot); + } +} + +class Edge2PtConicalEffect : public GrGradientEffect { +public: + class GLSLEdge2PtConicalProcessor; + + static sk_sp<GrFragmentProcessor> Make(const CreateArgs& args) { + return sk_sp<GrFragmentProcessor>(new Edge2PtConicalEffect(args)); + } + + ~Edge2PtConicalEffect() override {} + + const char* name() const override { + return "Two-Point Conical Gradient Edge Touching"; + } + + // The radial gradient parameters can collapse to a linear (instead of quadratic) equation. + SkScalar center() const { return fCenterX1; } + SkScalar diffRadius() const { return fDiffRadius; } + SkScalar radius() const { return fRadius0; } + +private: + GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; + + void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override; + + bool onIsEqual(const GrFragmentProcessor& sBase) const override { + const Edge2PtConicalEffect& s = sBase.cast<Edge2PtConicalEffect>(); + return (INHERITED::onIsEqual(sBase) && + this->fCenterX1 == s.fCenterX1 && + this->fRadius0 == s.fRadius0 && + this->fDiffRadius == s.fDiffRadius); + } + + Edge2PtConicalEffect(const CreateArgs& args) + : INHERITED(args, false /* opaque: draws transparent black outside of the cone. */) { + const SkTwoPointConicalGradient& shader = + *static_cast<const SkTwoPointConicalGradient*>(args.fShader); + fCenterX1 = shader.getCenterX1(); + fRadius0 = shader.getStartRadius(); + fDiffRadius = shader.getDiffRadius(); + this->initClassID<Edge2PtConicalEffect>(); + // We should only be calling this shader if we are degenerate case with touching circles + // When deciding if we are in edge case, we scaled by the end radius for cases when the + // start radius was close to zero, otherwise we scaled by the start radius. In addition + // Our test for the edge case in set_matrix_circle_conical has a higher tolerance so we + // need the sqrt value below + SkASSERT(SkScalarAbs(SkScalarAbs(fDiffRadius) - fCenterX1) < + (fRadius0 < kErrorTol ? shader.getEndRadius() * kEdgeErrorTol : + fRadius0 * sqrt(kEdgeErrorTol))); + + // We pass the linear part of the quadratic as a varying. + // float b = -2.0 * (fCenterX1 * x + fRadius0 * fDiffRadius * z) + fBTransform = this->getCoordTransform(); + SkMatrix& bMatrix = *fBTransform.accessMatrix(); + SkScalar r0dr = fRadius0 * fDiffRadius; + bMatrix[SkMatrix::kMScaleX] = -2 * (fCenterX1 * bMatrix[SkMatrix::kMScaleX] + + r0dr * bMatrix[SkMatrix::kMPersp0]); + bMatrix[SkMatrix::kMSkewX] = -2 * (fCenterX1 * bMatrix[SkMatrix::kMSkewX] + + r0dr * bMatrix[SkMatrix::kMPersp1]); + bMatrix[SkMatrix::kMTransX] = -2 * (fCenterX1 * bMatrix[SkMatrix::kMTransX] + + r0dr * bMatrix[SkMatrix::kMPersp2]); + this->addCoordTransform(&fBTransform); + } + + GR_DECLARE_FRAGMENT_PROCESSOR_TEST; + + // @{ + // Cache of values - these can change arbitrarily, EXCEPT + // we shouldn't change between degenerate and non-degenerate?! + + GrCoordTransform fBTransform; + SkScalar fCenterX1; + SkScalar fRadius0; + SkScalar fDiffRadius; + + // @} + + typedef GrGradientEffect INHERITED; +}; + +class Edge2PtConicalEffect::GLSLEdge2PtConicalProcessor : public GrGradientEffect::GLSLProcessor { +public: + GLSLEdge2PtConicalProcessor(const GrProcessor&); + ~GLSLEdge2PtConicalProcessor() override {} + + virtual void emitCode(EmitArgs&) override; + + static void GenKey(const GrProcessor&, const GrShaderCaps& caps, GrProcessorKeyBuilder* b); + +protected: + void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override; + + UniformHandle fParamUni; + + const char* fVSVaryingName; + const char* fFSVaryingName; + + // @{ + /// Values last uploaded as uniforms + + SkScalar fCachedRadius; + SkScalar fCachedDiffRadius; + + // @} + +private: + typedef GrGradientEffect::GLSLProcessor INHERITED; + +}; + +void Edge2PtConicalEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps, + GrProcessorKeyBuilder* b) const { + Edge2PtConicalEffect::GLSLEdge2PtConicalProcessor::GenKey(*this, caps, b); +} + +GrGLSLFragmentProcessor* Edge2PtConicalEffect::onCreateGLSLInstance() const { + return new Edge2PtConicalEffect::GLSLEdge2PtConicalProcessor(*this); +} + +GR_DEFINE_FRAGMENT_PROCESSOR_TEST(Edge2PtConicalEffect); + +/* + * All Two point conical gradient test create functions may occasionally create edge case shaders + */ +#if GR_TEST_UTILS +sk_sp<GrFragmentProcessor> Edge2PtConicalEffect::TestCreate(GrProcessorTestData* d) { + SkPoint center1 = {d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()}; + SkScalar radius1 = d->fRandom->nextUScalar1(); + SkPoint center2; + SkScalar radius2; + do { + center2.set(d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()); + // If the circles are identical the factory will give us an empty shader. + // This will happen if we pick identical centers + } while (center1 == center2); + + // Below makes sure that circle one is contained within circle two + // and both circles are touching on an edge + SkPoint diff = center2 - center1; + SkScalar diffLen = diff.length(); + radius2 = radius1 + diffLen; + + RandomGradientParams params(d->fRandom); + auto shader = params.fUseColors4f ? + SkGradientShader::MakeTwoPointConical(center1, radius1, center2, radius2, + params.fColors4f, params.fColorSpace, params.fStops, + params.fColorCount, params.fTileMode) : + SkGradientShader::MakeTwoPointConical(center1, radius1, center2, radius2, + params.fColors, params.fStops, + params.fColorCount, params.fTileMode); + GrTest::TestAsFPArgs asFPArgs(d); + sk_sp<GrFragmentProcessor> fp = as_SB(shader)->asFragmentProcessor(asFPArgs.args()); + GrAlwaysAssert(fp); + return fp; +} +#endif + +Edge2PtConicalEffect::GLSLEdge2PtConicalProcessor::GLSLEdge2PtConicalProcessor(const GrProcessor&) + : fVSVaryingName(nullptr) + , fFSVaryingName(nullptr) + , fCachedRadius(-SK_ScalarMax) + , fCachedDiffRadius(-SK_ScalarMax) {} + +void Edge2PtConicalEffect::GLSLEdge2PtConicalProcessor::emitCode(EmitArgs& args) { + const Edge2PtConicalEffect& ge = args.fFp.cast<Edge2PtConicalEffect>(); + GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; + this->emitUniforms(uniformHandler, ge); + fParamUni = uniformHandler->addUniform(kFragment_GrShaderFlag, + kVec3f_GrSLType, kDefault_GrSLPrecision, + "Conical2FSParams"); + + SkString cName("c"); + SkString tName("t"); + SkString p0; // start radius + SkString p1; // start radius squared + SkString p2; // difference in radii (r1 - r0) + + + p0.appendf("%s.x", uniformHandler->getUniformVariable(fParamUni).getName().c_str()); + p1.appendf("%s.y", uniformHandler->getUniformVariable(fParamUni).getName().c_str()); + p2.appendf("%s.z", uniformHandler->getUniformVariable(fParamUni).getName().c_str()); + + // We interpolate the linear component in coords[1]. + SkASSERT(args.fTransformedCoords[0].getType() == args.fTransformedCoords[1].getType()); + const char* coords2D; + SkString bVar; + GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; + if (kVec3f_GrSLType == args.fTransformedCoords[0].getType()) { + fragBuilder->codeAppendf("\tvec3 interpolants = vec3(%s.xy / %s.z, %s.x / %s.z);\n", + args.fTransformedCoords[0].c_str(), + args.fTransformedCoords[0].c_str(), + args.fTransformedCoords[1].c_str(), + args.fTransformedCoords[1].c_str()); + coords2D = "interpolants.xy"; + bVar = "interpolants.z"; + } else { + coords2D = args.fTransformedCoords[0].c_str(); + bVar.printf("%s.x", args.fTransformedCoords[1].c_str()); + } + + // output will default to transparent black (we simply won't write anything + // else to it if invalid, instead of discarding or returning prematurely) + fragBuilder->codeAppendf("\t%s = vec4(0.0,0.0,0.0,0.0);\n", args.fOutputColor); + + // c = (x^2)+(y^2) - params[1] + fragBuilder->codeAppendf("\tfloat %s = dot(%s, %s) - %s;\n", + cName.c_str(), coords2D, coords2D, p1.c_str()); + + // linear case: t = -c/b + fragBuilder->codeAppendf("\tfloat %s = -(%s / %s);\n", tName.c_str(), + cName.c_str(), bVar.c_str()); + + // if r(t) > 0, then t will be the x coordinate + fragBuilder->codeAppendf("\tif (%s * %s + %s > 0.0) {\n", tName.c_str(), + p2.c_str(), p0.c_str()); + fragBuilder->codeAppend("\t"); + this->emitColor(fragBuilder, + uniformHandler, + args.fShaderCaps, + ge, + tName.c_str(), + args.fOutputColor, + args.fInputColor, + args.fTexSamplers); + fragBuilder->codeAppend("\t}\n"); +} + +void Edge2PtConicalEffect::GLSLEdge2PtConicalProcessor::onSetData( + const GrGLSLProgramDataManager& pdman, const GrFragmentProcessor& processor) { + INHERITED::onSetData(pdman, processor); + const Edge2PtConicalEffect& data = processor.cast<Edge2PtConicalEffect>(); + SkScalar radius0 = data.radius(); + SkScalar diffRadius = data.diffRadius(); + + if (fCachedRadius != radius0 || + fCachedDiffRadius != diffRadius) { + + pdman.set3f(fParamUni, radius0, radius0 * radius0, diffRadius); + fCachedRadius = radius0; + fCachedDiffRadius = diffRadius; + } +} + +void Edge2PtConicalEffect::GLSLEdge2PtConicalProcessor::GenKey(const GrProcessor& processor, + const GrShaderCaps&, GrProcessorKeyBuilder* b) { + b->add32(GenBaseGradientKey(processor)); +} + +////////////////////////////////////////////////////////////////////////////// +// Focal Conical Gradients +////////////////////////////////////////////////////////////////////////////// + +static ConicalType set_matrix_focal_conical(const SkTwoPointConicalGradient& shader, + SkMatrix* invLMatrix, SkScalar* focalX) { + // Inverse of the current local matrix is passed in then, + // translate, scale, and rotate such that endCircle is unit circle on x-axis, + // and focal point is at the origin. + ConicalType conicalType; + const SkPoint& focal = shader.getStartCenter(); + const SkPoint& centerEnd = shader.getEndCenter(); + SkScalar radius = shader.getEndRadius(); + SkScalar invRadius = 1.f / radius; + + SkMatrix matrix; + + matrix.setTranslate(-centerEnd.fX, -centerEnd.fY); + matrix.postScale(invRadius, invRadius); + + SkPoint focalTrans; + matrix.mapPoints(&focalTrans, &focal, 1); + *focalX = focalTrans.length(); + + if (0.f != *focalX) { + SkScalar invFocalX = SkScalarInvert(*focalX); + SkMatrix rot; + rot.setSinCos(-invFocalX * focalTrans.fY, invFocalX * focalTrans.fX); + matrix.postConcat(rot); + } + + matrix.postTranslate(-(*focalX), 0.f); + + // If the focal point is touching the edge of the circle it will + // cause a degenerate case that must be handled separately + // kEdgeErrorTol = 5 * kErrorTol was picked after manual testing the + // stability trade off versus the linear approx used in the Edge Shader + if (SkScalarAbs(1.f - (*focalX)) < kEdgeErrorTol) { + return kEdge_ConicalType; + } + + // Scale factor 1 / (1 - focalX * focalX) + SkScalar oneMinusF2 = 1.f - *focalX * *focalX; + SkScalar s = SkScalarInvert(oneMinusF2); + + + if (s >= 0.f) { + conicalType = kInside_ConicalType; + matrix.postScale(s, s * SkScalarSqrt(oneMinusF2)); + } else { + conicalType = kOutside_ConicalType; + matrix.postScale(s, s); + } + + invLMatrix->postConcat(matrix); + + return conicalType; +} + +////////////////////////////////////////////////////////////////////////////// + +class FocalOutside2PtConicalEffect : public GrGradientEffect { +public: + class GLSLFocalOutside2PtConicalProcessor; + + static sk_sp<GrFragmentProcessor> Make(const CreateArgs& args, SkScalar focalX) { + return sk_sp<GrFragmentProcessor>( + new FocalOutside2PtConicalEffect(args, focalX)); + } + + ~FocalOutside2PtConicalEffect() override {} + + const char* name() const override { + return "Two-Point Conical Gradient Focal Outside"; + } + + bool isFlipped() const { return fIsFlipped; } + SkScalar focal() const { return fFocalX; } + +private: + GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; + + void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override; + + bool onIsEqual(const GrFragmentProcessor& sBase) const override { + const FocalOutside2PtConicalEffect& s = sBase.cast<FocalOutside2PtConicalEffect>(); + return (INHERITED::onIsEqual(sBase) && + this->fFocalX == s.fFocalX && + this->fIsFlipped == s.fIsFlipped); + } + + static bool IsFlipped(const CreateArgs& args) { + // eww. + return static_cast<const SkTwoPointConicalGradient*>(args.fShader)->isFlippedGrad(); + } + + FocalOutside2PtConicalEffect(const CreateArgs& args, SkScalar focalX) + : INHERITED(args, false /* opaque: draws transparent black outside of the cone. */) + , fFocalX(focalX) + , fIsFlipped(IsFlipped(args)) { + this->initClassID<FocalOutside2PtConicalEffect>(); + } + + GR_DECLARE_FRAGMENT_PROCESSOR_TEST; + + SkScalar fFocalX; + bool fIsFlipped; + + typedef GrGradientEffect INHERITED; +}; + +class FocalOutside2PtConicalEffect::GLSLFocalOutside2PtConicalProcessor + : public GrGradientEffect::GLSLProcessor { +public: + GLSLFocalOutside2PtConicalProcessor(const GrProcessor&); + ~GLSLFocalOutside2PtConicalProcessor() override {} + + virtual void emitCode(EmitArgs&) override; + + static void GenKey(const GrProcessor&, const GrShaderCaps& caps, GrProcessorKeyBuilder* b); + +protected: + void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override; + + UniformHandle fParamUni; + + const char* fVSVaryingName; + const char* fFSVaryingName; + + bool fIsFlipped; + + // @{ + /// Values last uploaded as uniforms + + SkScalar fCachedFocal; + + // @} + +private: + typedef GrGradientEffect::GLSLProcessor INHERITED; + +}; + +void FocalOutside2PtConicalEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps, + GrProcessorKeyBuilder* b) const { + FocalOutside2PtConicalEffect::GLSLFocalOutside2PtConicalProcessor::GenKey(*this, caps, b); +} + +GrGLSLFragmentProcessor* FocalOutside2PtConicalEffect::onCreateGLSLInstance() const { + return new FocalOutside2PtConicalEffect::GLSLFocalOutside2PtConicalProcessor(*this); +} + +GR_DEFINE_FRAGMENT_PROCESSOR_TEST(FocalOutside2PtConicalEffect); + +/* + * All Two point conical gradient test create functions may occasionally create edge case shaders + */ +#if GR_TEST_UTILS +sk_sp<GrFragmentProcessor> FocalOutside2PtConicalEffect::TestCreate(GrProcessorTestData* d) { + SkPoint center1 = {d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()}; + SkScalar radius1 = 0.f; + SkPoint center2; + SkScalar radius2; + do { + center2.set(d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()); + // Need to make sure the centers are not the same or else focal point will be inside + } while (center1 == center2); + + SkPoint diff = center2 - center1; + SkScalar diffLen = diff.length(); + // Below makes sure that the focal point is not contained within circle two + radius2 = d->fRandom->nextRangeF(0.f, diffLen); + + RandomGradientParams params(d->fRandom); + auto shader = params.fUseColors4f ? + SkGradientShader::MakeTwoPointConical(center1, radius1, center2, radius2, + params.fColors4f, params.fColorSpace, params.fStops, + params.fColorCount, params.fTileMode) : + SkGradientShader::MakeTwoPointConical(center1, radius1, center2, radius2, + params.fColors, params.fStops, + params.fColorCount, params.fTileMode); + GrTest::TestAsFPArgs asFPArgs(d); + sk_sp<GrFragmentProcessor> fp = as_SB(shader)->asFragmentProcessor(asFPArgs.args()); + GrAlwaysAssert(fp); + return fp; +} +#endif + +FocalOutside2PtConicalEffect::GLSLFocalOutside2PtConicalProcessor + ::GLSLFocalOutside2PtConicalProcessor(const GrProcessor& processor) + : fVSVaryingName(nullptr) + , fFSVaryingName(nullptr) + , fCachedFocal(SK_ScalarMax) { + const FocalOutside2PtConicalEffect& data = processor.cast<FocalOutside2PtConicalEffect>(); + fIsFlipped = data.isFlipped(); +} + +void FocalOutside2PtConicalEffect::GLSLFocalOutside2PtConicalProcessor::emitCode(EmitArgs& args) { + const FocalOutside2PtConicalEffect& ge = args.fFp.cast<FocalOutside2PtConicalEffect>(); + GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; + this->emitUniforms(uniformHandler, ge); + fParamUni = uniformHandler->addUniform(kFragment_GrShaderFlag, + kVec2f_GrSLType, kDefault_GrSLPrecision, + "Conical2FSParams"); + SkString tName("t"); + SkString p0; // focalX + SkString p1; // 1 - focalX * focalX + + p0.appendf("%s.x", uniformHandler->getUniformVariable(fParamUni).getName().c_str()); + p1.appendf("%s.y", uniformHandler->getUniformVariable(fParamUni).getName().c_str()); + + // if we have a vec3 from being in perspective, convert it to a vec2 first + GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; + SkString coords2DString = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]); + const char* coords2D = coords2DString.c_str(); + + // t = p.x * focal.x +/- sqrt(p.x^2 + (1 - focal.x^2) * p.y^2) + + // output will default to transparent black (we simply won't write anything + // else to it if invalid, instead of discarding or returning prematurely) + fragBuilder->codeAppendf("\t%s = vec4(0.0,0.0,0.0,0.0);\n", args.fOutputColor); + + fragBuilder->codeAppendf("\tfloat xs = %s.x * %s.x;\n", coords2D, coords2D); + fragBuilder->codeAppendf("\tfloat ys = %s.y * %s.y;\n", coords2D, coords2D); + fragBuilder->codeAppendf("\tfloat d = xs + %s * ys;\n", p1.c_str()); + + // Must check to see if we flipped the circle order (to make sure start radius < end radius) + // If so we must also flip sign on sqrt + if (!fIsFlipped) { + fragBuilder->codeAppendf("\tfloat %s = %s.x * %s + sqrt(d);\n", tName.c_str(), + coords2D, p0.c_str()); + } else { + fragBuilder->codeAppendf("\tfloat %s = %s.x * %s - sqrt(d);\n", tName.c_str(), + coords2D, p0.c_str()); + } + + fragBuilder->codeAppendf("\tif (%s >= 0.0 && d >= 0.0) {\n", tName.c_str()); + fragBuilder->codeAppend("\t\t"); + this->emitColor(fragBuilder, + uniformHandler, + args.fShaderCaps, + ge, + tName.c_str(), + args.fOutputColor, + args.fInputColor, + args.fTexSamplers); + fragBuilder->codeAppend("\t}\n"); +} + +void FocalOutside2PtConicalEffect::GLSLFocalOutside2PtConicalProcessor::onSetData( + const GrGLSLProgramDataManager& pdman, const GrFragmentProcessor& processor) { + INHERITED::onSetData(pdman, processor); + const FocalOutside2PtConicalEffect& data = processor.cast<FocalOutside2PtConicalEffect>(); + SkASSERT(data.isFlipped() == fIsFlipped); + SkScalar focal = data.focal(); + + if (fCachedFocal != focal) { + SkScalar oneMinus2F = 1.f - focal * focal; + + pdman.set2f(fParamUni, SkScalarToFloat(focal), SkScalarToFloat(oneMinus2F)); + fCachedFocal = focal; + } +} + +void FocalOutside2PtConicalEffect::GLSLFocalOutside2PtConicalProcessor::GenKey( + const GrProcessor& processor, + const GrShaderCaps&, GrProcessorKeyBuilder* b) { + uint32_t* key = b->add32n(2); + key[0] = GenBaseGradientKey(processor); + key[1] = processor.cast<FocalOutside2PtConicalEffect>().isFlipped(); +} + +////////////////////////////////////////////////////////////////////////////// + +class FocalInside2PtConicalEffect : public GrGradientEffect { +public: + class GLSLFocalInside2PtConicalProcessor; + + static sk_sp<GrFragmentProcessor> Make(const CreateArgs& args, SkScalar focalX) { + return sk_sp<GrFragmentProcessor>( + new FocalInside2PtConicalEffect(args, focalX)); + } + + ~FocalInside2PtConicalEffect() override {} + + const char* name() const override { + return "Two-Point Conical Gradient Focal Inside"; + } + + SkScalar focal() const { return fFocalX; } + + typedef FocalInside2PtConicalEffect::GLSLFocalInside2PtConicalProcessor GLSLProcessor; + +private: + GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; + + void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override; + + bool onIsEqual(const GrFragmentProcessor& sBase) const override { + const FocalInside2PtConicalEffect& s = sBase.cast<FocalInside2PtConicalEffect>(); + return (INHERITED::onIsEqual(sBase) && + this->fFocalX == s.fFocalX); + } + + FocalInside2PtConicalEffect(const CreateArgs& args, SkScalar focalX) + : INHERITED(args, args.fShader->colorsAreOpaque()), fFocalX(focalX) { + this->initClassID<FocalInside2PtConicalEffect>(); + } + + GR_DECLARE_FRAGMENT_PROCESSOR_TEST; + + SkScalar fFocalX; + + typedef GrGradientEffect INHERITED; +}; + +class FocalInside2PtConicalEffect::GLSLFocalInside2PtConicalProcessor + : public GrGradientEffect::GLSLProcessor { +public: + GLSLFocalInside2PtConicalProcessor(const GrProcessor&); + ~GLSLFocalInside2PtConicalProcessor() override {} + + virtual void emitCode(EmitArgs&) override; + + static void GenKey(const GrProcessor&, const GrShaderCaps& caps, GrProcessorKeyBuilder* b); + +protected: + void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override; + + UniformHandle fFocalUni; + + const char* fVSVaryingName; + const char* fFSVaryingName; + + // @{ + /// Values last uploaded as uniforms + + SkScalar fCachedFocal; + + // @} + +private: + typedef GrGradientEffect::GLSLProcessor INHERITED; + +}; + +void FocalInside2PtConicalEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps, + GrProcessorKeyBuilder* b) const { + FocalInside2PtConicalEffect::GLSLFocalInside2PtConicalProcessor::GenKey(*this, caps, b); +} + +GrGLSLFragmentProcessor* FocalInside2PtConicalEffect::onCreateGLSLInstance() const { + return new FocalInside2PtConicalEffect::GLSLFocalInside2PtConicalProcessor(*this); +} + +GR_DEFINE_FRAGMENT_PROCESSOR_TEST(FocalInside2PtConicalEffect); + +/* + * All Two point conical gradient test create functions may occasionally create edge case shaders + */ +#if GR_TEST_UTILS +sk_sp<GrFragmentProcessor> FocalInside2PtConicalEffect::TestCreate(GrProcessorTestData* d) { + SkPoint center1 = {d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()}; + SkScalar radius1 = 0.f; + SkPoint center2; + SkScalar radius2; + do { + center2.set(d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()); + // Below makes sure radius2 is larger enouch such that the focal point + // is inside the end circle + SkScalar increase = d->fRandom->nextUScalar1(); + SkPoint diff = center2 - center1; + SkScalar diffLen = diff.length(); + radius2 = diffLen + increase; + // If the circles are identical the factory will give us an empty shader. + } while (radius1 == radius2 && center1 == center2); + + RandomGradientParams params(d->fRandom); + auto shader = params.fUseColors4f ? + SkGradientShader::MakeTwoPointConical(center1, radius1, center2, radius2, + params.fColors4f, params.fColorSpace, params.fStops, + params.fColorCount, params.fTileMode) : + SkGradientShader::MakeTwoPointConical(center1, radius1, center2, radius2, + params.fColors, params.fStops, + params.fColorCount, params.fTileMode); + GrTest::TestAsFPArgs asFPArgs(d); + sk_sp<GrFragmentProcessor> fp = as_SB(shader)->asFragmentProcessor(asFPArgs.args()); + GrAlwaysAssert(fp); + return fp; +} +#endif + +FocalInside2PtConicalEffect::GLSLFocalInside2PtConicalProcessor + ::GLSLFocalInside2PtConicalProcessor(const GrProcessor&) + : fVSVaryingName(nullptr) + , fFSVaryingName(nullptr) + , fCachedFocal(SK_ScalarMax) {} + +void FocalInside2PtConicalEffect::GLSLFocalInside2PtConicalProcessor::emitCode(EmitArgs& args) { + const FocalInside2PtConicalEffect& ge = args.fFp.cast<FocalInside2PtConicalEffect>(); + GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; + this->emitUniforms(uniformHandler, ge); + fFocalUni = uniformHandler->addUniform(kFragment_GrShaderFlag, + kFloat_GrSLType, kDefault_GrSLPrecision, + "Conical2FSParams"); + SkString tName("t"); + + // this is the distance along x-axis from the end center to focal point in + // transformed coordinates + GrShaderVar focal = uniformHandler->getUniformVariable(fFocalUni); + + // if we have a vec3 from being in perspective, convert it to a vec2 first + GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; + SkString coords2DString = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]); + const char* coords2D = coords2DString.c_str(); + + // t = p.x * focalX + length(p) + fragBuilder->codeAppendf("\tfloat %s = %s.x * %s + length(%s);\n", tName.c_str(), + coords2D, focal.c_str(), coords2D); + + this->emitColor(fragBuilder, + uniformHandler, + args.fShaderCaps, + ge, + tName.c_str(), + args.fOutputColor, + args.fInputColor, + args.fTexSamplers); +} + +void FocalInside2PtConicalEffect::GLSLFocalInside2PtConicalProcessor::onSetData( + const GrGLSLProgramDataManager& pdman, const GrFragmentProcessor& processor) { + INHERITED::onSetData(pdman, processor); + const FocalInside2PtConicalEffect& data = processor.cast<FocalInside2PtConicalEffect>(); + SkScalar focal = data.focal(); + + if (fCachedFocal != focal) { + pdman.set1f(fFocalUni, SkScalarToFloat(focal)); + fCachedFocal = focal; + } +} + +void FocalInside2PtConicalEffect::GLSLFocalInside2PtConicalProcessor::GenKey( + const GrProcessor& processor, + const GrShaderCaps&, GrProcessorKeyBuilder* b) { + b->add32(GenBaseGradientKey(processor)); +} + +////////////////////////////////////////////////////////////////////////////// +// Circle Conical Gradients +////////////////////////////////////////////////////////////////////////////// + +struct CircleConicalInfo { + SkPoint fCenterEnd; + SkScalar fA; + SkScalar fB; + SkScalar fC; +}; + +// Returns focal distance along x-axis in transformed coords +static ConicalType set_matrix_circle_conical(const SkTwoPointConicalGradient& shader, + SkMatrix* invLMatrix, CircleConicalInfo* info) { + // Inverse of the current local matrix is passed in then, + // translate and scale such that start circle is on the origin and has radius 1 + const SkPoint& centerStart = shader.getStartCenter(); + const SkPoint& centerEnd = shader.getEndCenter(); + SkScalar radiusStart = shader.getStartRadius(); + SkScalar radiusEnd = shader.getEndRadius(); + + SkMatrix matrix; + + matrix.setTranslate(-centerStart.fX, -centerStart.fY); + + SkScalar invStartRad = 1.f / radiusStart; + matrix.postScale(invStartRad, invStartRad); + + radiusEnd /= radiusStart; + + SkPoint centerEndTrans; + matrix.mapPoints(¢erEndTrans, ¢erEnd, 1); + + SkScalar A = centerEndTrans.fX * centerEndTrans.fX + centerEndTrans.fY * centerEndTrans.fY + - radiusEnd * radiusEnd + 2 * radiusEnd - 1; + + // Check to see if start circle is inside end circle with edges touching. + // If touching we return that it is of kEdge_ConicalType, and leave the matrix setting + // to the edge shader. kEdgeErrorTol = 5 * kErrorTol was picked after manual testing + // so that C = 1 / A is stable, and the linear approximation used in the Edge shader is + // still accurate. + if (SkScalarAbs(A) < kEdgeErrorTol) { + return kEdge_ConicalType; + } + + SkScalar C = 1.f / A; + SkScalar B = (radiusEnd - 1.f) * C; + + matrix.postScale(C, C); + + invLMatrix->postConcat(matrix); + + info->fCenterEnd = centerEndTrans; + info->fA = A; + info->fB = B; + info->fC = C; + + // if A ends up being negative, the start circle is contained completely inside the end cirlce + if (A < 0.f) { + return kInside_ConicalType; + } + return kOutside_ConicalType; +} + +class CircleInside2PtConicalEffect : public GrGradientEffect { +public: + class GLSLCircleInside2PtConicalProcessor; + + static sk_sp<GrFragmentProcessor> Make(const CreateArgs& args, const CircleConicalInfo& info) { + return sk_sp<GrFragmentProcessor>( + new CircleInside2PtConicalEffect(args, info)); + } + + ~CircleInside2PtConicalEffect() override {} + + const char* name() const override { return "Two-Point Conical Gradient Inside"; } + + SkScalar centerX() const { return fInfo.fCenterEnd.fX; } + SkScalar centerY() const { return fInfo.fCenterEnd.fY; } + SkScalar A() const { return fInfo.fA; } + SkScalar B() const { return fInfo.fB; } + SkScalar C() const { return fInfo.fC; } + +private: + GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; + + virtual void onGetGLSLProcessorKey(const GrShaderCaps& caps, + GrProcessorKeyBuilder* b) const override; + + bool onIsEqual(const GrFragmentProcessor& sBase) const override { + const CircleInside2PtConicalEffect& s = sBase.cast<CircleInside2PtConicalEffect>(); + return (INHERITED::onIsEqual(sBase) && + this->fInfo.fCenterEnd == s.fInfo.fCenterEnd && + this->fInfo.fA == s.fInfo.fA && + this->fInfo.fB == s.fInfo.fB && + this->fInfo.fC == s.fInfo.fC); + } + + CircleInside2PtConicalEffect(const CreateArgs& args, const CircleConicalInfo& info) + : INHERITED(args, args.fShader->colorsAreOpaque()), fInfo(info) { + this->initClassID<CircleInside2PtConicalEffect>(); + } + + GR_DECLARE_FRAGMENT_PROCESSOR_TEST; + + const CircleConicalInfo fInfo; + + typedef GrGradientEffect INHERITED; +}; + +class CircleInside2PtConicalEffect::GLSLCircleInside2PtConicalProcessor + : public GrGradientEffect::GLSLProcessor { +public: + GLSLCircleInside2PtConicalProcessor(const GrProcessor&); + ~GLSLCircleInside2PtConicalProcessor() override {} + + virtual void emitCode(EmitArgs&) override; + + static void GenKey(const GrProcessor&, const GrShaderCaps& caps, GrProcessorKeyBuilder* b); + +protected: + void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override; + + UniformHandle fCenterUni; + UniformHandle fParamUni; + + const char* fVSVaryingName; + const char* fFSVaryingName; + + // @{ + /// Values last uploaded as uniforms + + SkScalar fCachedCenterX; + SkScalar fCachedCenterY; + SkScalar fCachedA; + SkScalar fCachedB; + SkScalar fCachedC; + + // @} + +private: + typedef GrGradientEffect::GLSLProcessor INHERITED; + +}; + +void CircleInside2PtConicalEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps, + GrProcessorKeyBuilder* b) const { + CircleInside2PtConicalEffect::GLSLCircleInside2PtConicalProcessor::GenKey(*this, caps, b); +} + +GrGLSLFragmentProcessor* CircleInside2PtConicalEffect::onCreateGLSLInstance() const { + return new CircleInside2PtConicalEffect::GLSLCircleInside2PtConicalProcessor(*this); +} + +GR_DEFINE_FRAGMENT_PROCESSOR_TEST(CircleInside2PtConicalEffect); + +/* + * All Two point conical gradient test create functions may occasionally create edge case shaders + */ +#if GR_TEST_UTILS +sk_sp<GrFragmentProcessor> CircleInside2PtConicalEffect::TestCreate(GrProcessorTestData* d) { + SkPoint center1 = {d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()}; + SkScalar radius1 = d->fRandom->nextUScalar1() + 0.0001f; // make sure radius1 != 0 + SkPoint center2; + SkScalar radius2; + do { + center2.set(d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()); + // Below makes sure that circle one is contained within circle two + SkScalar increase = d->fRandom->nextUScalar1(); + SkPoint diff = center2 - center1; + SkScalar diffLen = diff.length(); + radius2 = radius1 + diffLen + increase; + // If the circles are identical the factory will give us an empty shader. + } while (radius1 == radius2 && center1 == center2); + + RandomGradientParams params(d->fRandom); + auto shader = params.fUseColors4f ? + SkGradientShader::MakeTwoPointConical(center1, radius1, center2, radius2, + params.fColors4f, params.fColorSpace, params.fStops, + params.fColorCount, params.fTileMode) : + SkGradientShader::MakeTwoPointConical(center1, radius1, center2, radius2, + params.fColors, params.fStops, + params.fColorCount, params.fTileMode); + GrTest::TestAsFPArgs asFPArgs(d); + sk_sp<GrFragmentProcessor> fp = as_SB(shader)->asFragmentProcessor(asFPArgs.args()); + GrAlwaysAssert(fp); + return fp; +} +#endif + +CircleInside2PtConicalEffect::GLSLCircleInside2PtConicalProcessor + ::GLSLCircleInside2PtConicalProcessor(const GrProcessor& processor) + : fVSVaryingName(nullptr) + , fFSVaryingName(nullptr) + , fCachedCenterX(SK_ScalarMax) + , fCachedCenterY(SK_ScalarMax) + , fCachedA(SK_ScalarMax) + , fCachedB(SK_ScalarMax) + , fCachedC(SK_ScalarMax) {} + +void CircleInside2PtConicalEffect::GLSLCircleInside2PtConicalProcessor::emitCode(EmitArgs& args) { + const CircleInside2PtConicalEffect& ge = args.fFp.cast<CircleInside2PtConicalEffect>(); + GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; + this->emitUniforms(uniformHandler, ge); + fCenterUni = uniformHandler->addUniform(kFragment_GrShaderFlag, + kVec2f_GrSLType, kDefault_GrSLPrecision, + "Conical2FSCenter"); + fParamUni = uniformHandler->addUniform(kFragment_GrShaderFlag, + kVec3f_GrSLType, kDefault_GrSLPrecision, + "Conical2FSParams"); + SkString tName("t"); + + GrShaderVar center = uniformHandler->getUniformVariable(fCenterUni); + // params.x = A + // params.y = B + // params.z = C + GrShaderVar params = uniformHandler->getUniformVariable(fParamUni); + + // if we have a vec3 from being in perspective, convert it to a vec2 first + GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; + SkString coords2DString = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]); + const char* coords2D = coords2DString.c_str(); + + // p = coords2D + // e = center end + // r = radius end + // A = dot(e, e) - r^2 + 2 * r - 1 + // B = (r -1) / A + // C = 1 / A + // d = dot(e, p) + B + // t = d +/- sqrt(d^2 - A * dot(p, p) + C) + fragBuilder->codeAppendf("\tfloat pDotp = dot(%s, %s);\n", coords2D, coords2D); + fragBuilder->codeAppendf("\tfloat d = dot(%s, %s) + %s.y;\n", coords2D, center.c_str(), + params.c_str()); + fragBuilder->codeAppendf("\tfloat %s = d + sqrt(d * d - %s.x * pDotp + %s.z);\n", + tName.c_str(), params.c_str(), params.c_str()); + + this->emitColor(fragBuilder, + uniformHandler, + args.fShaderCaps, + ge, + tName.c_str(), + args.fOutputColor, + args.fInputColor, + args.fTexSamplers); +} + +void CircleInside2PtConicalEffect::GLSLCircleInside2PtConicalProcessor::onSetData( + const GrGLSLProgramDataManager& pdman, const GrFragmentProcessor& processor) { + INHERITED::onSetData(pdman, processor); + const CircleInside2PtConicalEffect& data = processor.cast<CircleInside2PtConicalEffect>(); + SkScalar centerX = data.centerX(); + SkScalar centerY = data.centerY(); + SkScalar A = data.A(); + SkScalar B = data.B(); + SkScalar C = data.C(); + + if (fCachedCenterX != centerX || fCachedCenterY != centerY || + fCachedA != A || fCachedB != B || fCachedC != C) { + + pdman.set2f(fCenterUni, SkScalarToFloat(centerX), SkScalarToFloat(centerY)); + pdman.set3f(fParamUni, SkScalarToFloat(A), SkScalarToFloat(B), SkScalarToFloat(C)); + + fCachedCenterX = centerX; + fCachedCenterY = centerY; + fCachedA = A; + fCachedB = B; + fCachedC = C; + } +} + +void CircleInside2PtConicalEffect::GLSLCircleInside2PtConicalProcessor::GenKey( + const GrProcessor& processor, + const GrShaderCaps&, GrProcessorKeyBuilder* b) { + b->add32(GenBaseGradientKey(processor)); +} + +////////////////////////////////////////////////////////////////////////////// + +class CircleOutside2PtConicalEffect : public GrGradientEffect { +public: + class GLSLCircleOutside2PtConicalProcessor; + + static sk_sp<GrFragmentProcessor> Make(const CreateArgs& args, const CircleConicalInfo& info) { + return sk_sp<GrFragmentProcessor>( + new CircleOutside2PtConicalEffect(args, info)); + } + + ~CircleOutside2PtConicalEffect() override {} + + const char* name() const override { return "Two-Point Conical Gradient Outside"; } + + SkScalar centerX() const { return fInfo.fCenterEnd.fX; } + SkScalar centerY() const { return fInfo.fCenterEnd.fY; } + SkScalar A() const { return fInfo.fA; } + SkScalar B() const { return fInfo.fB; } + SkScalar C() const { return fInfo.fC; } + SkScalar tLimit() const { return fTLimit; } + bool isFlipped() const { return fIsFlipped; } + +private: + GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; + + void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override; + + bool onIsEqual(const GrFragmentProcessor& sBase) const override { + const CircleOutside2PtConicalEffect& s = sBase.cast<CircleOutside2PtConicalEffect>(); + return (INHERITED::onIsEqual(sBase) && + this->fInfo.fCenterEnd == s.fInfo.fCenterEnd && + this->fInfo.fA == s.fInfo.fA && + this->fInfo.fB == s.fInfo.fB && + this->fInfo.fC == s.fInfo.fC && + this->fTLimit == s.fTLimit && + this->fIsFlipped == s.fIsFlipped); + } + + CircleOutside2PtConicalEffect(const CreateArgs& args, const CircleConicalInfo& info) + : INHERITED(args, false /* opaque: draws transparent black outside of the cone. */) + , fInfo(info) { + this->initClassID<CircleOutside2PtConicalEffect>(); + const SkTwoPointConicalGradient& shader = + *static_cast<const SkTwoPointConicalGradient*>(args.fShader); + if (shader.getStartRadius() != shader.getEndRadius()) { + fTLimit = shader.getStartRadius() / (shader.getStartRadius() - shader.getEndRadius()); + } else { + fTLimit = SK_ScalarMin; + } + + fIsFlipped = shader.isFlippedGrad(); + } + + GR_DECLARE_FRAGMENT_PROCESSOR_TEST; + + const CircleConicalInfo fInfo; + SkScalar fTLimit; + bool fIsFlipped; + + typedef GrGradientEffect INHERITED; +}; + +class CircleOutside2PtConicalEffect::GLSLCircleOutside2PtConicalProcessor + : public GrGradientEffect::GLSLProcessor { +public: + GLSLCircleOutside2PtConicalProcessor(const GrProcessor&); + ~GLSLCircleOutside2PtConicalProcessor() override {} + + virtual void emitCode(EmitArgs&) override; + + static void GenKey(const GrProcessor&, const GrShaderCaps& caps, GrProcessorKeyBuilder* b); + +protected: + void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override; + + UniformHandle fCenterUni; + UniformHandle fParamUni; + + const char* fVSVaryingName; + const char* fFSVaryingName; + + bool fIsFlipped; + + // @{ + /// Values last uploaded as uniforms + + SkScalar fCachedCenterX; + SkScalar fCachedCenterY; + SkScalar fCachedA; + SkScalar fCachedB; + SkScalar fCachedC; + SkScalar fCachedTLimit; + + // @} + +private: + typedef GrGradientEffect::GLSLProcessor INHERITED; + +}; + +void CircleOutside2PtConicalEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps, + GrProcessorKeyBuilder* b) const { + CircleOutside2PtConicalEffect::GLSLCircleOutside2PtConicalProcessor::GenKey(*this, caps, b); +} + +GrGLSLFragmentProcessor* CircleOutside2PtConicalEffect::onCreateGLSLInstance() const { + return new CircleOutside2PtConicalEffect::GLSLCircleOutside2PtConicalProcessor(*this); +} + +GR_DEFINE_FRAGMENT_PROCESSOR_TEST(CircleOutside2PtConicalEffect); + +/* + * All Two point conical gradient test create functions may occasionally create edge case shaders + */ +#if GR_TEST_UTILS +sk_sp<GrFragmentProcessor> CircleOutside2PtConicalEffect::TestCreate(GrProcessorTestData* d) { + SkPoint center1 = {d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()}; + SkScalar radius1 = d->fRandom->nextUScalar1() + 0.0001f; // make sure radius1 != 0 + SkPoint center2; + SkScalar radius2; + SkScalar diffLen; + do { + center2.set(d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()); + // If the circles share a center than we can't be in the outside case + } while (center1 == center2); + SkPoint diff = center2 - center1; + diffLen = diff.length(); + // Below makes sure that circle one is not contained within circle two + // and have radius2 >= radius to match sorting on cpu side + radius2 = radius1 + d->fRandom->nextRangeF(0.f, diffLen); + + RandomGradientParams params(d->fRandom); + auto shader = params.fUseColors4f ? + SkGradientShader::MakeTwoPointConical(center1, radius1, center2, radius2, + params.fColors4f, params.fColorSpace, params.fStops, + params.fColorCount, params.fTileMode) : + SkGradientShader::MakeTwoPointConical(center1, radius1, center2, radius2, + params.fColors, params.fStops, + params.fColorCount, params.fTileMode); + GrTest::TestAsFPArgs asFPArgs(d); + sk_sp<GrFragmentProcessor> fp = as_SB(shader)->asFragmentProcessor(asFPArgs.args()); + GrAlwaysAssert(fp); + return fp; +} +#endif + +CircleOutside2PtConicalEffect::GLSLCircleOutside2PtConicalProcessor + ::GLSLCircleOutside2PtConicalProcessor(const GrProcessor& processor) + : fVSVaryingName(nullptr) + , fFSVaryingName(nullptr) + , fCachedCenterX(SK_ScalarMax) + , fCachedCenterY(SK_ScalarMax) + , fCachedA(SK_ScalarMax) + , fCachedB(SK_ScalarMax) + , fCachedC(SK_ScalarMax) + , fCachedTLimit(SK_ScalarMax) { + const CircleOutside2PtConicalEffect& data = processor.cast<CircleOutside2PtConicalEffect>(); + fIsFlipped = data.isFlipped(); + } + +void CircleOutside2PtConicalEffect::GLSLCircleOutside2PtConicalProcessor::emitCode(EmitArgs& args) { + const CircleOutside2PtConicalEffect& ge = args.fFp.cast<CircleOutside2PtConicalEffect>(); + GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; + this->emitUniforms(uniformHandler, ge); + fCenterUni = uniformHandler->addUniform(kFragment_GrShaderFlag, + kVec2f_GrSLType, kDefault_GrSLPrecision, + "Conical2FSCenter"); + fParamUni = uniformHandler->addUniform(kFragment_GrShaderFlag, + kVec4f_GrSLType, kDefault_GrSLPrecision, + "Conical2FSParams"); + SkString tName("t"); + + GrShaderVar center = uniformHandler->getUniformVariable(fCenterUni); + // params.x = A + // params.y = B + // params.z = C + GrShaderVar params = uniformHandler->getUniformVariable(fParamUni); + + // if we have a vec3 from being in perspective, convert it to a vec2 first + GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; + SkString coords2DString = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]); + const char* coords2D = coords2DString.c_str(); + + // output will default to transparent black (we simply won't write anything + // else to it if invalid, instead of discarding or returning prematurely) + fragBuilder->codeAppendf("\t%s = vec4(0.0,0.0,0.0,0.0);\n", args.fOutputColor); + + // p = coords2D + // e = center end + // r = radius end + // A = dot(e, e) - r^2 + 2 * r - 1 + // B = (r -1) / A + // C = 1 / A + // d = dot(e, p) + B + // t = d +/- sqrt(d^2 - A * dot(p, p) + C) + + fragBuilder->codeAppendf("\tfloat pDotp = dot(%s, %s);\n", coords2D, coords2D); + fragBuilder->codeAppendf("\tfloat d = dot(%s, %s) + %s.y;\n", coords2D, center.c_str(), + params.c_str()); + fragBuilder->codeAppendf("\tfloat deter = d * d - %s.x * pDotp + %s.z;\n", params.c_str(), + params.c_str()); + + // Must check to see if we flipped the circle order (to make sure start radius < end radius) + // If so we must also flip sign on sqrt + if (!fIsFlipped) { + fragBuilder->codeAppendf("\tfloat %s = d + sqrt(deter);\n", tName.c_str()); + } else { + fragBuilder->codeAppendf("\tfloat %s = d - sqrt(deter);\n", tName.c_str()); + } + + fragBuilder->codeAppendf("\tif (%s >= %s.w && deter >= 0.0) {\n", + tName.c_str(), params.c_str()); + fragBuilder->codeAppend("\t\t"); + this->emitColor(fragBuilder, + uniformHandler, + args.fShaderCaps, + ge, + tName.c_str(), + args.fOutputColor, + args.fInputColor, + args.fTexSamplers); + fragBuilder->codeAppend("\t}\n"); +} + +void CircleOutside2PtConicalEffect::GLSLCircleOutside2PtConicalProcessor::onSetData( + const GrGLSLProgramDataManager& pdman, const GrFragmentProcessor& processor) { + INHERITED::onSetData(pdman, processor); + const CircleOutside2PtConicalEffect& data = processor.cast<CircleOutside2PtConicalEffect>(); + SkASSERT(data.isFlipped() == fIsFlipped); + SkScalar centerX = data.centerX(); + SkScalar centerY = data.centerY(); + SkScalar A = data.A(); + SkScalar B = data.B(); + SkScalar C = data.C(); + SkScalar tLimit = data.tLimit(); + + if (fCachedCenterX != centerX || fCachedCenterY != centerY || + fCachedA != A || fCachedB != B || fCachedC != C || fCachedTLimit != tLimit) { + + pdman.set2f(fCenterUni, SkScalarToFloat(centerX), SkScalarToFloat(centerY)); + pdman.set4f(fParamUni, SkScalarToFloat(A), SkScalarToFloat(B), SkScalarToFloat(C), + SkScalarToFloat(tLimit)); + + fCachedCenterX = centerX; + fCachedCenterY = centerY; + fCachedA = A; + fCachedB = B; + fCachedC = C; + fCachedTLimit = tLimit; + } +} + +void CircleOutside2PtConicalEffect::GLSLCircleOutside2PtConicalProcessor::GenKey( + const GrProcessor& processor, + const GrShaderCaps&, GrProcessorKeyBuilder* b) { + uint32_t* key = b->add32n(2); + key[0] = GenBaseGradientKey(processor); + key[1] = processor.cast<CircleOutside2PtConicalEffect>().isFlipped(); +} + +////////////////////////////////////////////////////////////////////////////// + +sk_sp<GrFragmentProcessor> Gr2PtConicalGradientEffect::Make( + const GrGradientEffect::CreateArgs& args) { + const SkTwoPointConicalGradient& shader = + *static_cast<const SkTwoPointConicalGradient*>(args.fShader); + + SkMatrix matrix; + if (!shader.getLocalMatrix().invert(&matrix)) { + return nullptr; + } + if (args.fMatrix) { + SkMatrix inv; + if (!args.fMatrix->invert(&inv)) { + return nullptr; + } + matrix.postConcat(inv); + } + + GrGradientEffect::CreateArgs newArgs(args.fContext, args.fShader, &matrix, args.fTileMode, + std::move(args.fColorSpaceXform), args.fGammaCorrect); + + if (shader.getStartRadius() < kErrorTol) { + SkScalar focalX; + ConicalType type = set_matrix_focal_conical(shader, &matrix, &focalX); + if (type == kInside_ConicalType) { + return FocalInside2PtConicalEffect::Make(newArgs, focalX); + } else if(type == kEdge_ConicalType) { + set_matrix_edge_conical(shader, &matrix); + return Edge2PtConicalEffect::Make(newArgs); + } else { + return FocalOutside2PtConicalEffect::Make(newArgs, focalX); + } + } + + CircleConicalInfo info; + ConicalType type = set_matrix_circle_conical(shader, &matrix, &info); + + if (type == kInside_ConicalType) { + return CircleInside2PtConicalEffect::Make(newArgs, info); + } else if (type == kEdge_ConicalType) { + set_matrix_edge_conical(shader, &matrix); + return Edge2PtConicalEffect::Make(newArgs); + } else { + return CircleOutside2PtConicalEffect::Make(newArgs, info); + } +} + +#endif |