| |
| /* |
| * 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_gpu.h" |
| |
| #include "SkTwoPointConicalGradient.h" |
| |
| #if SK_SUPPORT_GPU |
| #include "GrTBackendEffectFactory.h" |
| #include "gl/builders/GrGLProgramBuilder.h" |
| // For brevity |
| typedef GrGLProgramDataManager::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(-SkScalarMul(invDiffLen, diff.fY), |
| SkScalarMul(invDiffLen, diff.fX)); |
| invLMatrix->postConcat(rot); |
| } |
| } |
| |
| class GLEdge2PtConicalEffect; |
| |
| class Edge2PtConicalEffect : public GrGradientEffect { |
| public: |
| |
| static GrEffect* Create(GrContext* ctx, |
| const SkTwoPointConicalGradient& shader, |
| const SkMatrix& matrix, |
| SkShader::TileMode tm) { |
| return SkNEW_ARGS(Edge2PtConicalEffect, (ctx, shader, matrix, tm)); |
| } |
| |
| virtual ~Edge2PtConicalEffect() {} |
| |
| static const char* Name() { return "Two-Point Conical Gradient Edge Touching"; } |
| virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| |
| // 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; } |
| |
| typedef GLEdge2PtConicalEffect GLEffect; |
| |
| private: |
| virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE { |
| const Edge2PtConicalEffect& s = sBase.cast<Edge2PtConicalEffect>(); |
| return (INHERITED::onIsEqual(sBase) && |
| this->fCenterX1 == s.fCenterX1 && |
| this->fRadius0 == s.fRadius0 && |
| this->fDiffRadius == s.fDiffRadius); |
| } |
| |
| Edge2PtConicalEffect(GrContext* ctx, |
| const SkTwoPointConicalGradient& shader, |
| const SkMatrix& matrix, |
| SkShader::TileMode tm) |
| : INHERITED(ctx, shader, matrix, tm), |
| fCenterX1(shader.getCenterX1()), |
| fRadius0(shader.getStartRadius()), |
| fDiffRadius(shader.getDiffRadius()){ |
| // 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 |
| SkASSERT(SkScalarAbs(SkScalarAbs(fDiffRadius) - SkScalarAbs(fCenterX1)) < |
| kEdgeErrorTol * (fRadius0 < kErrorTol ? shader.getEndRadius() : fRadius0)); |
| |
| // 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 = SkScalarMul(fRadius0, fDiffRadius); |
| bMatrix[SkMatrix::kMScaleX] = -2 * (SkScalarMul(fCenterX1, bMatrix[SkMatrix::kMScaleX]) + |
| SkScalarMul(r0dr, bMatrix[SkMatrix::kMPersp0])); |
| bMatrix[SkMatrix::kMSkewX] = -2 * (SkScalarMul(fCenterX1, bMatrix[SkMatrix::kMSkewX]) + |
| SkScalarMul(r0dr, bMatrix[SkMatrix::kMPersp1])); |
| bMatrix[SkMatrix::kMTransX] = -2 * (SkScalarMul(fCenterX1, bMatrix[SkMatrix::kMTransX]) + |
| SkScalarMul(r0dr, bMatrix[SkMatrix::kMPersp2])); |
| this->addCoordTransform(&fBTransform); |
| } |
| |
| GR_DECLARE_EFFECT_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 GLEdge2PtConicalEffect : public GrGLGradientEffect { |
| public: |
| GLEdge2PtConicalEffect(const GrBackendEffectFactory& factory, const GrEffect&); |
| virtual ~GLEdge2PtConicalEffect() { } |
| |
| virtual void emitCode(GrGLProgramBuilder*, |
| const GrEffect&, |
| const GrEffectKey&, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray&, |
| const TextureSamplerArray&) SK_OVERRIDE; |
| virtual void setData(const GrGLProgramDataManager&, const GrEffect&) SK_OVERRIDE; |
| |
| static void GenKey(const GrEffect&, const GrGLCaps& caps, GrEffectKeyBuilder* b); |
| |
| protected: |
| UniformHandle fParamUni; |
| |
| const char* fVSVaryingName; |
| const char* fFSVaryingName; |
| |
| // @{ |
| /// Values last uploaded as uniforms |
| |
| SkScalar fCachedRadius; |
| SkScalar fCachedDiffRadius; |
| |
| // @} |
| |
| private: |
| typedef GrGLGradientEffect INHERITED; |
| |
| }; |
| |
| const GrBackendEffectFactory& Edge2PtConicalEffect::getFactory() const { |
| return GrTBackendEffectFactory<Edge2PtConicalEffect>::getInstance(); |
| } |
| |
| GR_DEFINE_EFFECT_TEST(Edge2PtConicalEffect); |
| |
| GrEffect* Edge2PtConicalEffect::TestCreate(SkRandom* random, |
| GrContext* context, |
| const GrDrawTargetCaps&, |
| GrTexture**) { |
| SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; |
| SkScalar radius1 = random->nextUScalar1(); |
| SkPoint center2; |
| SkScalar radius2; |
| do { |
| center2.set(random->nextUScalar1(), random->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; |
| |
| SkColor colors[kMaxRandomGradientColors]; |
| SkScalar stopsArray[kMaxRandomGradientColors]; |
| SkScalar* stops = stopsArray; |
| SkShader::TileMode tm; |
| int colorCount = RandomGradientParams(random, colors, &stops, &tm); |
| SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, |
| center2, radius2, |
| colors, stops, colorCount, |
| tm)); |
| SkPaint paint; |
| GrEffect* effect; |
| GrColor paintColor; |
| SkAssertResult(shader->asNewEffect(context, paint, NULL, &paintColor, &effect)); |
| return effect; |
| } |
| |
| GLEdge2PtConicalEffect::GLEdge2PtConicalEffect(const GrBackendEffectFactory& factory, |
| const GrEffect& effect) |
| : INHERITED(factory) |
| , fVSVaryingName(NULL) |
| , fFSVaryingName(NULL) |
| , fCachedRadius(-SK_ScalarMax) |
| , fCachedDiffRadius(-SK_ScalarMax) {} |
| |
| void GLEdge2PtConicalEffect::emitCode(GrGLProgramBuilder* builder, |
| const GrEffect&, |
| const GrEffectKey& key, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray& coords, |
| const TextureSamplerArray& samplers) { |
| uint32_t baseKey = key.get32(0); |
| this->emitUniforms(builder, baseKey); |
| fParamUni = builder->addUniformArray(GrGLProgramBuilder::kFragment_Visibility, |
| kFloat_GrSLType, "Conical2FSParams", 3); |
| |
| SkString cName("c"); |
| SkString tName("t"); |
| SkString p0; // start radius |
| SkString p1; // start radius squared |
| SkString p2; // difference in radii (r1 - r0) |
| |
| builder->getUniformVariable(fParamUni).appendArrayAccess(0, &p0); |
| builder->getUniformVariable(fParamUni).appendArrayAccess(1, &p1); |
| builder->getUniformVariable(fParamUni).appendArrayAccess(2, &p2); |
| |
| // We interpolate the linear component in coords[1]. |
| SkASSERT(coords[0].type() == coords[1].type()); |
| const char* coords2D; |
| SkString bVar; |
| GrGLFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder(); |
| if (kVec3f_GrSLType == coords[0].type()) { |
| fsBuilder->codeAppendf("\tvec3 interpolants = vec3(%s.xy / %s.z, %s.x / %s.z);\n", |
| coords[0].c_str(), coords[0].c_str(), coords[1].c_str(), |
| coords[1].c_str()); |
| coords2D = "interpolants.xy"; |
| bVar = "interpolants.z"; |
| } else { |
| coords2D = coords[0].c_str(); |
| bVar.printf("%s.x", coords[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) |
| fsBuilder->codeAppendf("\t%s = vec4(0.0,0.0,0.0,0.0);\n", outputColor); |
| |
| // c = (x^2)+(y^2) - params[1] |
| fsBuilder->codeAppendf("\tfloat %s = dot(%s, %s) - %s;\n", |
| cName.c_str(), coords2D, coords2D, p1.c_str()); |
| |
| // linear case: t = -c/b |
| fsBuilder->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 |
| fsBuilder->codeAppendf("\tif (%s * %s + %s > 0.0) {\n", tName.c_str(), |
| p2.c_str(), p0.c_str()); |
| fsBuilder->codeAppend("\t"); |
| this->emitColor(builder, tName.c_str(), baseKey, outputColor, inputColor, samplers); |
| fsBuilder->codeAppend("\t}\n"); |
| } |
| |
| void GLEdge2PtConicalEffect::setData(const GrGLProgramDataManager& pdman, |
| const GrEffect& effect) { |
| INHERITED::setData(pdman, effect); |
| const Edge2PtConicalEffect& data = effect.cast<Edge2PtConicalEffect>(); |
| SkScalar radius0 = data.radius(); |
| SkScalar diffRadius = data.diffRadius(); |
| |
| if (fCachedRadius != radius0 || |
| fCachedDiffRadius != diffRadius) { |
| |
| float values[3] = { |
| SkScalarToFloat(radius0), |
| SkScalarToFloat(SkScalarMul(radius0, radius0)), |
| SkScalarToFloat(diffRadius) |
| }; |
| |
| pdman.set1fv(fParamUni, 3, values); |
| fCachedRadius = radius0; |
| fCachedDiffRadius = diffRadius; |
| } |
| } |
| |
| void GLEdge2PtConicalEffect::GenKey(const GrEffect& effect, |
| const GrGLCaps&, GrEffectKeyBuilder* b) { |
| b->add32(GenBaseGradientKey(effect)); |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // 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(-SkScalarMul(invFocalX, focalTrans.fY), |
| SkScalarMul(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 - SkScalarMul(*focalX, *focalX); |
| SkScalar s = SkScalarDiv(1.f, 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 GLFocalOutside2PtConicalEffect; |
| |
| class FocalOutside2PtConicalEffect : public GrGradientEffect { |
| public: |
| |
| static GrEffect* Create(GrContext* ctx, |
| const SkTwoPointConicalGradient& shader, |
| const SkMatrix& matrix, |
| SkShader::TileMode tm, |
| SkScalar focalX) { |
| return SkNEW_ARGS(FocalOutside2PtConicalEffect, (ctx, shader, matrix, tm, focalX)); |
| } |
| |
| virtual ~FocalOutside2PtConicalEffect() { } |
| |
| static const char* Name() { return "Two-Point Conical Gradient Focal Outside"; } |
| virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| |
| bool isFlipped() const { return fIsFlipped; } |
| SkScalar focal() const { return fFocalX; } |
| |
| typedef GLFocalOutside2PtConicalEffect GLEffect; |
| |
| private: |
| virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE { |
| const FocalOutside2PtConicalEffect& s = sBase.cast<FocalOutside2PtConicalEffect>(); |
| return (INHERITED::onIsEqual(sBase) && |
| this->fFocalX == s.fFocalX && |
| this->fIsFlipped == s.fIsFlipped); |
| } |
| |
| FocalOutside2PtConicalEffect(GrContext* ctx, |
| const SkTwoPointConicalGradient& shader, |
| const SkMatrix& matrix, |
| SkShader::TileMode tm, |
| SkScalar focalX) |
| : INHERITED(ctx, shader, matrix, tm), fFocalX(focalX), fIsFlipped(shader.isFlippedGrad()) {} |
| |
| GR_DECLARE_EFFECT_TEST; |
| |
| SkScalar fFocalX; |
| bool fIsFlipped; |
| |
| typedef GrGradientEffect INHERITED; |
| }; |
| |
| class GLFocalOutside2PtConicalEffect : public GrGLGradientEffect { |
| public: |
| GLFocalOutside2PtConicalEffect(const GrBackendEffectFactory& factory, const GrEffect&); |
| virtual ~GLFocalOutside2PtConicalEffect() { } |
| |
| virtual void emitCode(GrGLProgramBuilder*, |
| const GrEffect&, |
| const GrEffectKey&, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray&, |
| const TextureSamplerArray&) SK_OVERRIDE; |
| virtual void setData(const GrGLProgramDataManager&, const GrEffect&) SK_OVERRIDE; |
| |
| static void GenKey(const GrEffect&, const GrGLCaps& caps, GrEffectKeyBuilder* b); |
| |
| protected: |
| UniformHandle fParamUni; |
| |
| const char* fVSVaryingName; |
| const char* fFSVaryingName; |
| |
| bool fIsFlipped; |
| |
| // @{ |
| /// Values last uploaded as uniforms |
| |
| SkScalar fCachedFocal; |
| |
| // @} |
| |
| private: |
| typedef GrGLGradientEffect INHERITED; |
| |
| }; |
| |
| const GrBackendEffectFactory& FocalOutside2PtConicalEffect::getFactory() const { |
| return GrTBackendEffectFactory<FocalOutside2PtConicalEffect>::getInstance(); |
| } |
| |
| GR_DEFINE_EFFECT_TEST(FocalOutside2PtConicalEffect); |
| |
| GrEffect* FocalOutside2PtConicalEffect::TestCreate(SkRandom* random, |
| GrContext* context, |
| const GrDrawTargetCaps&, |
| GrTexture**) { |
| SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; |
| SkScalar radius1 = 0.f; |
| SkPoint center2; |
| SkScalar radius2; |
| do { |
| center2.set(random->nextUScalar1(), random->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 = random->nextRangeF(0.f, diffLen); |
| |
| SkColor colors[kMaxRandomGradientColors]; |
| SkScalar stopsArray[kMaxRandomGradientColors]; |
| SkScalar* stops = stopsArray; |
| SkShader::TileMode tm; |
| int colorCount = RandomGradientParams(random, colors, &stops, &tm); |
| SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, |
| center2, radius2, |
| colors, stops, colorCount, |
| tm)); |
| SkPaint paint; |
| GrEffect* effect; |
| GrColor paintColor; |
| SkAssertResult(shader->asNewEffect(context, paint, NULL, &paintColor, &effect)); |
| return effect; |
| } |
| |
| GLFocalOutside2PtConicalEffect::GLFocalOutside2PtConicalEffect(const GrBackendEffectFactory& factory, |
| const GrEffect& effect) |
| : INHERITED(factory) |
| , fVSVaryingName(NULL) |
| , fFSVaryingName(NULL) |
| , fCachedFocal(SK_ScalarMax) { |
| const FocalOutside2PtConicalEffect& data = effect.cast<FocalOutside2PtConicalEffect>(); |
| fIsFlipped = data.isFlipped(); |
| } |
| |
| void GLFocalOutside2PtConicalEffect::emitCode(GrGLProgramBuilder* builder, |
| const GrEffect&, |
| const GrEffectKey& key, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray& coords, |
| const TextureSamplerArray& samplers) { |
| uint32_t baseKey = key.get32(0); |
| this->emitUniforms(builder, baseKey); |
| fParamUni = builder->addUniformArray(GrGLProgramBuilder::kFragment_Visibility, |
| kFloat_GrSLType, "Conical2FSParams", 2); |
| SkString tName("t"); |
| SkString p0; // focalX |
| SkString p1; // 1 - focalX * focalX |
| |
| builder->getUniformVariable(fParamUni).appendArrayAccess(0, &p0); |
| builder->getUniformVariable(fParamUni).appendArrayAccess(1, &p1); |
| |
| // if we have a vec3 from being in perspective, convert it to a vec2 first |
| GrGLFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder(); |
| SkString coords2DString = fsBuilder->ensureFSCoords2D(coords, 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) |
| fsBuilder->codeAppendf("\t%s = vec4(0.0,0.0,0.0,0.0);\n", outputColor); |
| |
| fsBuilder->codeAppendf("\tfloat xs = %s.x * %s.x;\n", coords2D, coords2D); |
| fsBuilder->codeAppendf("\tfloat ys = %s.y * %s.y;\n", coords2D, coords2D); |
| fsBuilder->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) { |
| fsBuilder->codeAppendf("\tfloat %s = %s.x * %s + sqrt(d);\n", tName.c_str(), |
| coords2D, p0.c_str()); |
| } else { |
| fsBuilder->codeAppendf("\tfloat %s = %s.x * %s - sqrt(d);\n", tName.c_str(), |
| coords2D, p0.c_str()); |
| } |
| |
| fsBuilder->codeAppendf("\tif (%s >= 0.0 && d >= 0.0) {\n", tName.c_str()); |
| fsBuilder->codeAppend("\t\t"); |
| this->emitColor(builder, tName.c_str(), baseKey, outputColor, inputColor, samplers); |
| fsBuilder->codeAppend("\t}\n"); |
| } |
| |
| void GLFocalOutside2PtConicalEffect::setData(const GrGLProgramDataManager& pdman, |
| const GrEffect& effect) { |
| INHERITED::setData(pdman, effect); |
| const FocalOutside2PtConicalEffect& data = effect.cast<FocalOutside2PtConicalEffect>(); |
| SkASSERT(data.isFlipped() == fIsFlipped); |
| SkScalar focal = data.focal(); |
| |
| if (fCachedFocal != focal) { |
| SkScalar oneMinus2F = 1.f - SkScalarMul(focal, focal); |
| |
| float values[2] = { |
| SkScalarToFloat(focal), |
| SkScalarToFloat(oneMinus2F), |
| }; |
| |
| pdman.set1fv(fParamUni, 2, values); |
| fCachedFocal = focal; |
| } |
| } |
| |
| void GLFocalOutside2PtConicalEffect::GenKey(const GrEffect& effect, |
| const GrGLCaps&, GrEffectKeyBuilder* b) { |
| uint32_t* key = b->add32n(2); |
| key[0] = GenBaseGradientKey(effect); |
| key[1] = effect.cast<FocalOutside2PtConicalEffect>().isFlipped(); |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| class GLFocalInside2PtConicalEffect; |
| |
| class FocalInside2PtConicalEffect : public GrGradientEffect { |
| public: |
| |
| static GrEffect* Create(GrContext* ctx, |
| const SkTwoPointConicalGradient& shader, |
| const SkMatrix& matrix, |
| SkShader::TileMode tm, |
| SkScalar focalX) { |
| return SkNEW_ARGS(FocalInside2PtConicalEffect, (ctx, shader, matrix, tm, focalX)); |
| } |
| |
| virtual ~FocalInside2PtConicalEffect() {} |
| |
| static const char* Name() { return "Two-Point Conical Gradient Focal Inside"; } |
| virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| |
| SkScalar focal() const { return fFocalX; } |
| |
| typedef GLFocalInside2PtConicalEffect GLEffect; |
| |
| private: |
| virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE { |
| const FocalInside2PtConicalEffect& s = sBase.cast<FocalInside2PtConicalEffect>(); |
| return (INHERITED::onIsEqual(sBase) && |
| this->fFocalX == s.fFocalX); |
| } |
| |
| FocalInside2PtConicalEffect(GrContext* ctx, |
| const SkTwoPointConicalGradient& shader, |
| const SkMatrix& matrix, |
| SkShader::TileMode tm, |
| SkScalar focalX) |
| : INHERITED(ctx, shader, matrix, tm), fFocalX(focalX) {} |
| |
| GR_DECLARE_EFFECT_TEST; |
| |
| SkScalar fFocalX; |
| |
| typedef GrGradientEffect INHERITED; |
| }; |
| |
| class GLFocalInside2PtConicalEffect : public GrGLGradientEffect { |
| public: |
| GLFocalInside2PtConicalEffect(const GrBackendEffectFactory& factory, const GrEffect&); |
| virtual ~GLFocalInside2PtConicalEffect() {} |
| |
| virtual void emitCode(GrGLProgramBuilder*, |
| const GrEffect&, |
| const GrEffectKey&, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray&, |
| const TextureSamplerArray&) SK_OVERRIDE; |
| virtual void setData(const GrGLProgramDataManager&, const GrEffect&) SK_OVERRIDE; |
| |
| static void GenKey(const GrEffect&, const GrGLCaps& caps, GrEffectKeyBuilder* b); |
| |
| protected: |
| UniformHandle fFocalUni; |
| |
| const char* fVSVaryingName; |
| const char* fFSVaryingName; |
| |
| // @{ |
| /// Values last uploaded as uniforms |
| |
| SkScalar fCachedFocal; |
| |
| // @} |
| |
| private: |
| typedef GrGLGradientEffect INHERITED; |
| |
| }; |
| |
| const GrBackendEffectFactory& FocalInside2PtConicalEffect::getFactory() const { |
| return GrTBackendEffectFactory<FocalInside2PtConicalEffect>::getInstance(); |
| } |
| |
| GR_DEFINE_EFFECT_TEST(FocalInside2PtConicalEffect); |
| |
| GrEffect* FocalInside2PtConicalEffect::TestCreate(SkRandom* random, |
| GrContext* context, |
| const GrDrawTargetCaps&, |
| GrTexture**) { |
| SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; |
| SkScalar radius1 = 0.f; |
| SkPoint center2; |
| SkScalar radius2; |
| do { |
| center2.set(random->nextUScalar1(), random->nextUScalar1()); |
| // Below makes sure radius2 is larger enouch such that the focal point |
| // is inside the end circle |
| SkScalar increase = random->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); |
| |
| SkColor colors[kMaxRandomGradientColors]; |
| SkScalar stopsArray[kMaxRandomGradientColors]; |
| SkScalar* stops = stopsArray; |
| SkShader::TileMode tm; |
| int colorCount = RandomGradientParams(random, colors, &stops, &tm); |
| SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, |
| center2, radius2, |
| colors, stops, colorCount, |
| tm)); |
| SkPaint paint; |
| GrColor paintColor; |
| GrEffect* effect; |
| SkAssertResult(shader->asNewEffect(context, paint, NULL, &paintColor, &effect)); |
| return effect; |
| } |
| |
| GLFocalInside2PtConicalEffect::GLFocalInside2PtConicalEffect(const GrBackendEffectFactory& factory, |
| const GrEffect& effect) |
| : INHERITED(factory) |
| , fVSVaryingName(NULL) |
| , fFSVaryingName(NULL) |
| , fCachedFocal(SK_ScalarMax) {} |
| |
| void GLFocalInside2PtConicalEffect::emitCode(GrGLProgramBuilder* builder, |
| const GrEffect&, |
| const GrEffectKey& key, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray& coords, |
| const TextureSamplerArray& samplers) { |
| uint32_t baseKey = key.get32(0); |
| this->emitUniforms(builder, baseKey); |
| fFocalUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kFloat_GrSLType, "Conical2FSParams"); |
| SkString tName("t"); |
| |
| // this is the distance along x-axis from the end center to focal point in |
| // transformed coordinates |
| GrGLShaderVar focal = builder->getUniformVariable(fFocalUni); |
| |
| // if we have a vec3 from being in perspective, convert it to a vec2 first |
| GrGLFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder(); |
| SkString coords2DString = fsBuilder->ensureFSCoords2D(coords, 0); |
| const char* coords2D = coords2DString.c_str(); |
| |
| // t = p.x * focalX + length(p) |
| fsBuilder->codeAppendf("\tfloat %s = %s.x * %s + length(%s);\n", tName.c_str(), |
| coords2D, focal.c_str(), coords2D); |
| |
| this->emitColor(builder, tName.c_str(), baseKey, outputColor, inputColor, samplers); |
| } |
| |
| void GLFocalInside2PtConicalEffect::setData(const GrGLProgramDataManager& pdman, |
| const GrEffect& effect) { |
| INHERITED::setData(pdman, effect); |
| const FocalInside2PtConicalEffect& data = effect.cast<FocalInside2PtConicalEffect>(); |
| SkScalar focal = data.focal(); |
| |
| if (fCachedFocal != focal) { |
| pdman.set1f(fFocalUni, SkScalarToFloat(focal)); |
| fCachedFocal = focal; |
| } |
| } |
| |
| void GLFocalInside2PtConicalEffect::GenKey(const GrEffect& effect, |
| const GrGLCaps&, GrEffectKeyBuilder* b) { |
| b->add32(GenBaseGradientKey(effect)); |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // 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 GLCircleInside2PtConicalEffect; |
| |
| class CircleInside2PtConicalEffect : public GrGradientEffect { |
| public: |
| |
| static GrEffect* Create(GrContext* ctx, |
| const SkTwoPointConicalGradient& shader, |
| const SkMatrix& matrix, |
| SkShader::TileMode tm, |
| const CircleConicalInfo& info) { |
| return SkNEW_ARGS(CircleInside2PtConicalEffect, (ctx, shader, matrix, tm, info)); |
| } |
| |
| virtual ~CircleInside2PtConicalEffect() {} |
| |
| static const char* Name() { return "Two-Point Conical Gradient Inside"; } |
| virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| |
| 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; } |
| |
| typedef GLCircleInside2PtConicalEffect GLEffect; |
| |
| private: |
| virtual bool onIsEqual(const GrEffect& sBase) const SK_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(GrContext* ctx, |
| const SkTwoPointConicalGradient& shader, |
| const SkMatrix& matrix, |
| SkShader::TileMode tm, |
| const CircleConicalInfo& info) |
| : INHERITED(ctx, shader, matrix, tm), fInfo(info) {} |
| |
| GR_DECLARE_EFFECT_TEST; |
| |
| const CircleConicalInfo fInfo; |
| |
| typedef GrGradientEffect INHERITED; |
| }; |
| |
| class GLCircleInside2PtConicalEffect : public GrGLGradientEffect { |
| public: |
| GLCircleInside2PtConicalEffect(const GrBackendEffectFactory& factory, const GrEffect&); |
| virtual ~GLCircleInside2PtConicalEffect() {} |
| |
| virtual void emitCode(GrGLProgramBuilder*, |
| const GrEffect&, |
| const GrEffectKey&, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray&, |
| const TextureSamplerArray&) SK_OVERRIDE; |
| virtual void setData(const GrGLProgramDataManager&, const GrEffect&) SK_OVERRIDE; |
| |
| static void GenKey(const GrEffect&, const GrGLCaps& caps, GrEffectKeyBuilder* b); |
| |
| protected: |
| 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 GrGLGradientEffect INHERITED; |
| |
| }; |
| |
| const GrBackendEffectFactory& CircleInside2PtConicalEffect::getFactory() const { |
| return GrTBackendEffectFactory<CircleInside2PtConicalEffect>::getInstance(); |
| } |
| |
| GR_DEFINE_EFFECT_TEST(CircleInside2PtConicalEffect); |
| |
| GrEffect* CircleInside2PtConicalEffect::TestCreate(SkRandom* random, |
| GrContext* context, |
| const GrDrawTargetCaps&, |
| GrTexture**) { |
| SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; |
| SkScalar radius1 = random->nextUScalar1() + 0.0001f; // make sure radius1 != 0 |
| SkPoint center2; |
| SkScalar radius2; |
| do { |
| center2.set(random->nextUScalar1(), random->nextUScalar1()); |
| // Below makes sure that circle one is contained within circle two |
| SkScalar increase = random->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); |
| |
| SkColor colors[kMaxRandomGradientColors]; |
| SkScalar stopsArray[kMaxRandomGradientColors]; |
| SkScalar* stops = stopsArray; |
| SkShader::TileMode tm; |
| int colorCount = RandomGradientParams(random, colors, &stops, &tm); |
| SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, |
| center2, radius2, |
| colors, stops, colorCount, |
| tm)); |
| SkPaint paint; |
| GrColor paintColor; |
| GrEffect* effect; |
| SkAssertResult(shader->asNewEffect(context, paint, NULL, &paintColor, &effect)); |
| return effect; |
| } |
| |
| GLCircleInside2PtConicalEffect::GLCircleInside2PtConicalEffect(const GrBackendEffectFactory& factory, |
| const GrEffect& effect) |
| : INHERITED(factory) |
| , fVSVaryingName(NULL) |
| , fFSVaryingName(NULL) |
| , fCachedCenterX(SK_ScalarMax) |
| , fCachedCenterY(SK_ScalarMax) |
| , fCachedA(SK_ScalarMax) |
| , fCachedB(SK_ScalarMax) |
| , fCachedC(SK_ScalarMax) {} |
| |
| void GLCircleInside2PtConicalEffect::emitCode(GrGLProgramBuilder* builder, |
| const GrEffect&, |
| const GrEffectKey& key, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray& coords, |
| const TextureSamplerArray& samplers) { |
| uint32_t baseKey = key.get32(0); |
| this->emitUniforms(builder, baseKey); |
| fCenterUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec2f_GrSLType, "Conical2FSCenter"); |
| fParamUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec3f_GrSLType, "Conical2FSParams"); |
| SkString tName("t"); |
| |
| GrGLShaderVar center = builder->getUniformVariable(fCenterUni); |
| // params.x = A |
| // params.y = B |
| // params.z = C |
| GrGLShaderVar params = builder->getUniformVariable(fParamUni); |
| |
| // if we have a vec3 from being in perspective, convert it to a vec2 first |
| GrGLFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder(); |
| SkString coords2DString = fsBuilder->ensureFSCoords2D(coords, 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) |
| fsBuilder->codeAppendf("\tfloat pDotp = dot(%s, %s);\n", coords2D, coords2D); |
| fsBuilder->codeAppendf("\tfloat d = dot(%s, %s) + %s.y;\n", coords2D, center.c_str(), |
| params.c_str()); |
| fsBuilder->codeAppendf("\tfloat %s = d + sqrt(d * d - %s.x * pDotp + %s.z);\n", |
| tName.c_str(), params.c_str(), params.c_str()); |
| |
| this->emitColor(builder, tName.c_str(), baseKey, outputColor, inputColor, samplers); |
| } |
| |
| void GLCircleInside2PtConicalEffect::setData(const GrGLProgramDataManager& pdman, |
| const GrEffect& effect) { |
| INHERITED::setData(pdman, effect); |
| const CircleInside2PtConicalEffect& data = effect.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 GLCircleInside2PtConicalEffect::GenKey(const GrEffect& effect, |
| const GrGLCaps&, GrEffectKeyBuilder* b) { |
| b->add32(GenBaseGradientKey(effect)); |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| class GLCircleOutside2PtConicalEffect; |
| |
| class CircleOutside2PtConicalEffect : public GrGradientEffect { |
| public: |
| |
| static GrEffect* Create(GrContext* ctx, |
| const SkTwoPointConicalGradient& shader, |
| const SkMatrix& matrix, |
| SkShader::TileMode tm, |
| const CircleConicalInfo& info) { |
| return SkNEW_ARGS(CircleOutside2PtConicalEffect, (ctx, shader, matrix, tm, info)); |
| } |
| |
| virtual ~CircleOutside2PtConicalEffect() {} |
| |
| static const char* Name() { return "Two-Point Conical Gradient Outside"; } |
| virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| |
| 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; } |
| |
| typedef GLCircleOutside2PtConicalEffect GLEffect; |
| |
| private: |
| virtual bool onIsEqual(const GrEffect& sBase) const SK_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(GrContext* ctx, |
| const SkTwoPointConicalGradient& shader, |
| const SkMatrix& matrix, |
| SkShader::TileMode tm, |
| const CircleConicalInfo& info) |
| : INHERITED(ctx, shader, matrix, tm), fInfo(info) { |
| if (shader.getStartRadius() != shader.getEndRadius()) { |
| fTLimit = SkScalarDiv(shader.getStartRadius(), |
| (shader.getStartRadius() - shader.getEndRadius())); |
| } else { |
| fTLimit = SK_ScalarMin; |
| } |
| |
| fIsFlipped = shader.isFlippedGrad(); |
| } |
| |
| GR_DECLARE_EFFECT_TEST; |
| |
| const CircleConicalInfo fInfo; |
| SkScalar fTLimit; |
| bool fIsFlipped; |
| |
| typedef GrGradientEffect INHERITED; |
| }; |
| |
| class GLCircleOutside2PtConicalEffect : public GrGLGradientEffect { |
| public: |
| GLCircleOutside2PtConicalEffect(const GrBackendEffectFactory& factory, const GrEffect&); |
| virtual ~GLCircleOutside2PtConicalEffect() {} |
| |
| virtual void emitCode(GrGLProgramBuilder*, |
| const GrEffect&, |
| const GrEffectKey&, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray&, |
| const TextureSamplerArray&) SK_OVERRIDE; |
| virtual void setData(const GrGLProgramDataManager&, const GrEffect&) SK_OVERRIDE; |
| |
| static void GenKey(const GrEffect&, const GrGLCaps& caps, GrEffectKeyBuilder* b); |
| |
| protected: |
| 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 GrGLGradientEffect INHERITED; |
| |
| }; |
| |
| const GrBackendEffectFactory& CircleOutside2PtConicalEffect::getFactory() const { |
| return GrTBackendEffectFactory<CircleOutside2PtConicalEffect>::getInstance(); |
| } |
| |
| GR_DEFINE_EFFECT_TEST(CircleOutside2PtConicalEffect); |
| |
| GrEffect* CircleOutside2PtConicalEffect::TestCreate(SkRandom* random, |
| GrContext* context, |
| const GrDrawTargetCaps&, |
| GrTexture**) { |
| SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; |
| SkScalar radius1 = random->nextUScalar1() + 0.0001f; // make sure radius1 != 0 |
| SkPoint center2; |
| SkScalar radius2; |
| SkScalar diffLen; |
| do { |
| center2.set(random->nextUScalar1(), random->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 + random->nextRangeF(0.f, diffLen); |
| |
| SkColor colors[kMaxRandomGradientColors]; |
| SkScalar stopsArray[kMaxRandomGradientColors]; |
| SkScalar* stops = stopsArray; |
| SkShader::TileMode tm; |
| int colorCount = RandomGradientParams(random, colors, &stops, &tm); |
| SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, |
| center2, radius2, |
| colors, stops, colorCount, |
| tm)); |
| SkPaint paint; |
| GrColor paintColor; |
| GrEffect* effect; |
| SkAssertResult(shader->asNewEffect(context, paint, NULL, &paintColor, &effect)); |
| return effect; |
| } |
| |
| GLCircleOutside2PtConicalEffect::GLCircleOutside2PtConicalEffect(const GrBackendEffectFactory& factory, |
| const GrEffect& effect) |
| : INHERITED(factory) |
| , fVSVaryingName(NULL) |
| , fFSVaryingName(NULL) |
| , fCachedCenterX(SK_ScalarMax) |
| , fCachedCenterY(SK_ScalarMax) |
| , fCachedA(SK_ScalarMax) |
| , fCachedB(SK_ScalarMax) |
| , fCachedC(SK_ScalarMax) |
| , fCachedTLimit(SK_ScalarMax) { |
| const CircleOutside2PtConicalEffect& data = effect.cast<CircleOutside2PtConicalEffect>(); |
| fIsFlipped = data.isFlipped(); |
| } |
| |
| void GLCircleOutside2PtConicalEffect::emitCode(GrGLProgramBuilder* builder, |
| const GrEffect&, |
| const GrEffectKey& key, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray& coords, |
| const TextureSamplerArray& samplers) { |
| uint32_t baseKey = key.get32(0); |
| this->emitUniforms(builder, baseKey); |
| fCenterUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec2f_GrSLType, "Conical2FSCenter"); |
| fParamUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec4f_GrSLType, "Conical2FSParams"); |
| SkString tName("t"); |
| |
| GrGLShaderVar center = builder->getUniformVariable(fCenterUni); |
| // params.x = A |
| // params.y = B |
| // params.z = C |
| GrGLShaderVar params = builder->getUniformVariable(fParamUni); |
| |
| // if we have a vec3 from being in perspective, convert it to a vec2 first |
| GrGLFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder(); |
| SkString coords2DString = fsBuilder->ensureFSCoords2D(coords, 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) |
| fsBuilder->codeAppendf("\t%s = vec4(0.0,0.0,0.0,0.0);\n", outputColor); |
| |
| // 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) |
| |
| fsBuilder->codeAppendf("\tfloat pDotp = dot(%s, %s);\n", coords2D, coords2D); |
| fsBuilder->codeAppendf("\tfloat d = dot(%s, %s) + %s.y;\n", coords2D, center.c_str(), |
| params.c_str()); |
| fsBuilder->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) { |
| fsBuilder->codeAppendf("\tfloat %s = d + sqrt(deter);\n", tName.c_str()); |
| } else { |
| fsBuilder->codeAppendf("\tfloat %s = d - sqrt(deter);\n", tName.c_str()); |
| } |
| |
| fsBuilder->codeAppendf("\tif (%s >= %s.w && deter >= 0.0) {\n", tName.c_str(), params.c_str()); |
| fsBuilder->codeAppend("\t\t"); |
| this->emitColor(builder, tName.c_str(), baseKey, outputColor, inputColor, samplers); |
| fsBuilder->codeAppend("\t}\n"); |
| } |
| |
| void GLCircleOutside2PtConicalEffect::setData(const GrGLProgramDataManager& pdman, |
| const GrEffect& effect) { |
| INHERITED::setData(pdman, effect); |
| const CircleOutside2PtConicalEffect& data = effect.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 GLCircleOutside2PtConicalEffect::GenKey(const GrEffect& effect, |
| const GrGLCaps&, GrEffectKeyBuilder* b) { |
| uint32_t* key = b->add32n(2); |
| key[0] = GenBaseGradientKey(effect); |
| key[1] = effect.cast<CircleOutside2PtConicalEffect>().isFlipped(); |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| GrEffect* Gr2PtConicalGradientEffect::Create(GrContext* ctx, |
| const SkTwoPointConicalGradient& shader, |
| SkShader::TileMode tm, |
| const SkMatrix* localMatrix) { |
| SkMatrix matrix; |
| if (!shader.getLocalMatrix().invert(&matrix)) { |
| return NULL; |
| } |
| if (localMatrix) { |
| SkMatrix inv; |
| if (!localMatrix->invert(&inv)) { |
| return NULL; |
| } |
| matrix.postConcat(inv); |
| } |
| |
| if (shader.getStartRadius() < kErrorTol) { |
| SkScalar focalX; |
| ConicalType type = set_matrix_focal_conical(shader, &matrix, &focalX); |
| if (type == kInside_ConicalType) { |
| return FocalInside2PtConicalEffect::Create(ctx, shader, matrix, tm, focalX); |
| } else if(type == kEdge_ConicalType) { |
| set_matrix_edge_conical(shader, &matrix); |
| return Edge2PtConicalEffect::Create(ctx, shader, matrix, tm); |
| } else { |
| return FocalOutside2PtConicalEffect::Create(ctx, shader, matrix, tm, focalX); |
| } |
| } |
| |
| CircleConicalInfo info; |
| ConicalType type = set_matrix_circle_conical(shader, &matrix, &info); |
| |
| if (type == kInside_ConicalType) { |
| return CircleInside2PtConicalEffect::Create(ctx, shader, matrix, tm, info); |
| } else if (type == kEdge_ConicalType) { |
| set_matrix_edge_conical(shader, &matrix); |
| return Edge2PtConicalEffect::Create(ctx, shader, matrix, tm); |
| } else { |
| return CircleOutside2PtConicalEffect::Create(ctx, shader, matrix, tm, info); |
| } |
| } |
| |
| #endif |