michael@0: /*
michael@0:  * Copyright 2013 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #include "GrBezierEffect.h"
michael@0: 
michael@0: #include "gl/GrGLEffect.h"
michael@0: #include "gl/GrGLSL.h"
michael@0: #include "gl/GrGLVertexEffect.h"
michael@0: #include "GrTBackendEffectFactory.h"
michael@0: 
michael@0: class GrGLConicEffect : public GrGLVertexEffect {
michael@0: public:
michael@0:     GrGLConicEffect(const GrBackendEffectFactory&, const GrDrawEffect&);
michael@0: 
michael@0:     virtual void emitCode(GrGLFullShaderBuilder* builder,
michael@0:                           const GrDrawEffect& drawEffect,
michael@0:                           EffectKey key,
michael@0:                           const char* outputColor,
michael@0:                           const char* inputColor,
michael@0:                           const TransformedCoordsArray&,
michael@0:                           const TextureSamplerArray&) SK_OVERRIDE;
michael@0: 
michael@0:     static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&);
michael@0: 
michael@0:     virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE {}
michael@0: 
michael@0: private:
michael@0:     GrEffectEdgeType fEdgeType;
michael@0: 
michael@0:     typedef GrGLVertexEffect INHERITED;
michael@0: };
michael@0: 
michael@0: GrGLConicEffect::GrGLConicEffect(const GrBackendEffectFactory& factory,
michael@0:                                  const GrDrawEffect& drawEffect)
michael@0:     : INHERITED (factory) {
michael@0:     const GrConicEffect& ce = drawEffect.castEffect<GrConicEffect>();
michael@0:     fEdgeType = ce.getEdgeType();
michael@0: }
michael@0: 
michael@0: void GrGLConicEffect::emitCode(GrGLFullShaderBuilder* builder,
michael@0:                                const GrDrawEffect& drawEffect,
michael@0:                                EffectKey key,
michael@0:                                const char* outputColor,
michael@0:                                const char* inputColor,
michael@0:                                const TransformedCoordsArray&,
michael@0:                                const TextureSamplerArray& samplers) {
michael@0:     const char *vsName, *fsName;
michael@0: 
michael@0:     builder->addVarying(kVec4f_GrSLType, "ConicCoeffs",
michael@0:                               &vsName, &fsName);
michael@0:     const SkString* attr0Name =
michael@0:         builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
michael@0:     builder->vsCodeAppendf("\t%s = %s;\n", vsName, attr0Name->c_str());
michael@0: 
michael@0:     builder->fsCodeAppend("\t\tfloat edgeAlpha;\n");
michael@0: 
michael@0:     switch (fEdgeType) {
michael@0:         case kHairlineAA_GrEffectEdgeType: {
michael@0:             SkAssertResult(builder->enableFeature(
michael@0:                     GrGLShaderBuilder::kStandardDerivatives_GLSLFeature));
michael@0:             builder->fsCodeAppendf("\t\tvec3 dklmdx = dFdx(%s.xyz);\n", fsName);
michael@0:             builder->fsCodeAppendf("\t\tvec3 dklmdy = dFdy(%s.xyz);\n", fsName);
michael@0:             builder->fsCodeAppendf("\t\tfloat dfdx =\n"
michael@0:                                    "\t\t\t2.0*%s.x*dklmdx.x - %s.y*dklmdx.z - %s.z*dklmdx.y;\n",
michael@0:                                    fsName, fsName, fsName);
michael@0:             builder->fsCodeAppendf("\t\tfloat dfdy =\n"
michael@0:                                    "\t\t\t2.0*%s.x*dklmdy.x - %s.y*dklmdy.z - %s.z*dklmdy.y;\n",
michael@0:                                    fsName, fsName, fsName);
michael@0:             builder->fsCodeAppend("\t\tvec2 gF = vec2(dfdx, dfdy);\n");
michael@0:             builder->fsCodeAppend("\t\tfloat gFM = sqrt(dot(gF, gF));\n");
michael@0:             builder->fsCodeAppendf("\t\tfloat func = %s.x*%s.x - %s.y*%s.z;\n", fsName, fsName,
michael@0:                                    fsName, fsName);
michael@0:             builder->fsCodeAppend("\t\tfunc = abs(func);\n");
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = func / gFM;\n");
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = max(1.0 - edgeAlpha, 0.0);\n");
michael@0:             // Add line below for smooth cubic ramp
michael@0:             // builder->fsCodeAppend("\t\tedgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);\n");
michael@0:             break;
michael@0:         }
michael@0:         case kFillAA_GrEffectEdgeType: {
michael@0:             SkAssertResult(builder->enableFeature(
michael@0:                     GrGLShaderBuilder::kStandardDerivatives_GLSLFeature));
michael@0:             builder->fsCodeAppendf("\t\tvec3 dklmdx = dFdx(%s.xyz);\n", fsName);
michael@0:             builder->fsCodeAppendf("\t\tvec3 dklmdy = dFdy(%s.xyz);\n", fsName);
michael@0:             builder->fsCodeAppendf("\t\tfloat dfdx =\n"
michael@0:                                    "\t\t\t2.0*%s.x*dklmdx.x - %s.y*dklmdx.z - %s.z*dklmdx.y;\n",
michael@0:                                    fsName, fsName, fsName);
michael@0:             builder->fsCodeAppendf("\t\tfloat dfdy =\n"
michael@0:                                    "\t\t\t2.0*%s.x*dklmdy.x - %s.y*dklmdy.z - %s.z*dklmdy.y;\n",
michael@0:                                    fsName, fsName, fsName);
michael@0:             builder->fsCodeAppend("\t\tvec2 gF = vec2(dfdx, dfdy);\n");
michael@0:             builder->fsCodeAppend("\t\tfloat gFM = sqrt(dot(gF, gF));\n");
michael@0:             builder->fsCodeAppendf("\t\tfloat func = %s.x*%s.x - %s.y*%s.z;\n", fsName, fsName,
michael@0:                                    fsName, fsName);
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = func / gFM;\n");
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = clamp(1.0 - edgeAlpha, 0.0, 1.0);\n");
michael@0:             // Add line below for smooth cubic ramp
michael@0:             // builder->fsCodeAppend("\t\tedgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);\n");
michael@0:             break;
michael@0:         }
michael@0:         case kFillBW_GrEffectEdgeType: {
michael@0:             builder->fsCodeAppendf("\t\tedgeAlpha = %s.x*%s.x - %s.y*%s.z;\n", fsName, fsName,
michael@0:                                    fsName, fsName);
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = float(edgeAlpha < 0.0);\n");
michael@0:             break;
michael@0:         }
michael@0:         default:
michael@0:             GrCrash("Shouldn't get here");
michael@0:     }
michael@0: 
michael@0:     builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
michael@0:                            (GrGLSLExpr4(inputColor) * GrGLSLExpr1("edgeAlpha")).c_str());
michael@0: }
michael@0: 
michael@0: GrGLEffect::EffectKey GrGLConicEffect::GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
michael@0:     const GrConicEffect& ce = drawEffect.castEffect<GrConicEffect>();
michael@0:     return ce.isAntiAliased() ? (ce.isFilled() ? 0x0 : 0x1) : 0x2;
michael@0: }
michael@0: 
michael@0: //////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: GrConicEffect::~GrConicEffect() {}
michael@0: 
michael@0: const GrBackendEffectFactory& GrConicEffect::getFactory() const {
michael@0:     return GrTBackendEffectFactory<GrConicEffect>::getInstance();
michael@0: }
michael@0: 
michael@0: GrConicEffect::GrConicEffect(GrEffectEdgeType edgeType) : GrVertexEffect() {
michael@0:     this->addVertexAttrib(kVec4f_GrSLType);
michael@0:     fEdgeType = edgeType;
michael@0: }
michael@0: 
michael@0: bool GrConicEffect::onIsEqual(const GrEffect& other) const {
michael@0:     const GrConicEffect& ce = CastEffect<GrConicEffect>(other);
michael@0:     return (ce.fEdgeType == fEdgeType);
michael@0: }
michael@0: 
michael@0: //////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: GR_DEFINE_EFFECT_TEST(GrConicEffect);
michael@0: 
michael@0: GrEffectRef* GrConicEffect::TestCreate(SkRandom* random,
michael@0:                                              GrContext*,
michael@0:                                              const GrDrawTargetCaps& caps,
michael@0:                                              GrTexture*[]) {
michael@0:     GrEffectRef* effect;
michael@0:     do {
michael@0:         GrEffectEdgeType edgeType = static_cast<GrEffectEdgeType>(
michael@0:                                                     random->nextULessThan(kGrEffectEdgeTypeCnt));
michael@0:         effect = GrConicEffect::Create(edgeType, caps);
michael@0:     } while (NULL == effect);
michael@0:     return effect;
michael@0: }
michael@0: 
michael@0: //////////////////////////////////////////////////////////////////////////////
michael@0: // Quad
michael@0: //////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: class GrGLQuadEffect : public GrGLVertexEffect {
michael@0: public:
michael@0:     GrGLQuadEffect(const GrBackendEffectFactory&, const GrDrawEffect&);
michael@0: 
michael@0:     virtual void emitCode(GrGLFullShaderBuilder* builder,
michael@0:                           const GrDrawEffect& drawEffect,
michael@0:                           EffectKey key,
michael@0:                           const char* outputColor,
michael@0:                           const char* inputColor,
michael@0:                           const TransformedCoordsArray&,
michael@0:                           const TextureSamplerArray&) SK_OVERRIDE;
michael@0: 
michael@0:     static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&);
michael@0: 
michael@0:     virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE {}
michael@0: 
michael@0: private:
michael@0:     GrEffectEdgeType fEdgeType;
michael@0: 
michael@0:     typedef GrGLVertexEffect INHERITED;
michael@0: };
michael@0: 
michael@0: GrGLQuadEffect::GrGLQuadEffect(const GrBackendEffectFactory& factory,
michael@0:                                  const GrDrawEffect& drawEffect)
michael@0:     : INHERITED (factory) {
michael@0:     const GrQuadEffect& ce = drawEffect.castEffect<GrQuadEffect>();
michael@0:     fEdgeType = ce.getEdgeType();
michael@0: }
michael@0: 
michael@0: void GrGLQuadEffect::emitCode(GrGLFullShaderBuilder* builder,
michael@0:                               const GrDrawEffect& drawEffect,
michael@0:                               EffectKey key,
michael@0:                               const char* outputColor,
michael@0:                               const char* inputColor,
michael@0:                               const TransformedCoordsArray&,
michael@0:                               const TextureSamplerArray& samplers) {
michael@0:     const char *vsName, *fsName;
michael@0: 
michael@0:     const SkString* attrName =
michael@0:         builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
michael@0:     builder->fsCodeAppendf("\t\tfloat edgeAlpha;\n");
michael@0: 
michael@0:     builder->addVarying(kVec4f_GrSLType, "HairQuadEdge", &vsName, &fsName);
michael@0: 
michael@0:     switch (fEdgeType) {
michael@0:         case kHairlineAA_GrEffectEdgeType: {
michael@0:             SkAssertResult(builder->enableFeature(
michael@0:                     GrGLShaderBuilder::kStandardDerivatives_GLSLFeature));
michael@0:             builder->fsCodeAppendf("\t\tvec2 duvdx = dFdx(%s.xy);\n", fsName);
michael@0:             builder->fsCodeAppendf("\t\tvec2 duvdy = dFdy(%s.xy);\n", fsName);
michael@0:             builder->fsCodeAppendf("\t\tvec2 gF = vec2(2.0*%s.x*duvdx.x - duvdx.y,\n"
michael@0:                                    "\t\t               2.0*%s.x*duvdy.x - duvdy.y);\n",
michael@0:                                    fsName, fsName);
michael@0:             builder->fsCodeAppendf("\t\tedgeAlpha = (%s.x*%s.x - %s.y);\n", fsName, fsName,
michael@0:                                    fsName);
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = sqrt(edgeAlpha*edgeAlpha / dot(gF, gF));\n");
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = max(1.0 - edgeAlpha, 0.0);\n");
michael@0:             // Add line below for smooth cubic ramp
michael@0:             // builder->fsCodeAppend("\t\tedgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);\n");
michael@0:             break;
michael@0:         }
michael@0:         case kFillAA_GrEffectEdgeType: {
michael@0:             SkAssertResult(builder->enableFeature(
michael@0:                     GrGLShaderBuilder::kStandardDerivatives_GLSLFeature));
michael@0:             builder->fsCodeAppendf("\t\tvec2 duvdx = dFdx(%s.xy);\n", fsName);
michael@0:             builder->fsCodeAppendf("\t\tvec2 duvdy = dFdy(%s.xy);\n", fsName);
michael@0:             builder->fsCodeAppendf("\t\tvec2 gF = vec2(2.0*%s.x*duvdx.x - duvdx.y,\n"
michael@0:                                    "\t\t               2.0*%s.x*duvdy.x - duvdy.y);\n",
michael@0:                                    fsName, fsName);
michael@0:             builder->fsCodeAppendf("\t\tedgeAlpha = (%s.x*%s.x - %s.y);\n", fsName, fsName,
michael@0:                                    fsName);
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = edgeAlpha / sqrt(dot(gF, gF));\n");
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = clamp(1.0 - edgeAlpha, 0.0, 1.0);\n");
michael@0:             // Add line below for smooth cubic ramp
michael@0:             // builder->fsCodeAppend("\t\tedgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);\n");
michael@0:             break;
michael@0:         }
michael@0:         case kFillBW_GrEffectEdgeType: {
michael@0:             builder->fsCodeAppendf("\t\tedgeAlpha = (%s.x*%s.x - %s.y);\n", fsName, fsName,
michael@0:                                    fsName);
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = float(edgeAlpha < 0.0);\n");
michael@0:             break;
michael@0:         }
michael@0:         default:
michael@0:             GrCrash("Shouldn't get here");
michael@0:     }
michael@0: 
michael@0:     builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
michael@0:                            (GrGLSLExpr4(inputColor) * GrGLSLExpr1("edgeAlpha")).c_str());
michael@0: 
michael@0: 
michael@0:     builder->vsCodeAppendf("\t%s = %s;\n", vsName, attrName->c_str());
michael@0: }
michael@0: 
michael@0: GrGLEffect::EffectKey GrGLQuadEffect::GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
michael@0:     const GrQuadEffect& ce = drawEffect.castEffect<GrQuadEffect>();
michael@0:     return ce.isAntiAliased() ? (ce.isFilled() ? 0x0 : 0x1) : 0x2;
michael@0: }
michael@0: 
michael@0: //////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: GrQuadEffect::~GrQuadEffect() {}
michael@0: 
michael@0: const GrBackendEffectFactory& GrQuadEffect::getFactory() const {
michael@0:     return GrTBackendEffectFactory<GrQuadEffect>::getInstance();
michael@0: }
michael@0: 
michael@0: GrQuadEffect::GrQuadEffect(GrEffectEdgeType edgeType) : GrVertexEffect() {
michael@0:     this->addVertexAttrib(kVec4f_GrSLType);
michael@0:     fEdgeType = edgeType;
michael@0: }
michael@0: 
michael@0: bool GrQuadEffect::onIsEqual(const GrEffect& other) const {
michael@0:     const GrQuadEffect& ce = CastEffect<GrQuadEffect>(other);
michael@0:     return (ce.fEdgeType == fEdgeType);
michael@0: }
michael@0: 
michael@0: //////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: GR_DEFINE_EFFECT_TEST(GrQuadEffect);
michael@0: 
michael@0: GrEffectRef* GrQuadEffect::TestCreate(SkRandom* random,
michael@0:                                              GrContext*,
michael@0:                                              const GrDrawTargetCaps& caps,
michael@0:                                              GrTexture*[]) {
michael@0:     GrEffectRef* effect;
michael@0:     do {
michael@0:         GrEffectEdgeType edgeType = static_cast<GrEffectEdgeType>(
michael@0:                                                     random->nextULessThan(kGrEffectEdgeTypeCnt));
michael@0:         effect = GrQuadEffect::Create(edgeType, caps);
michael@0:     } while (NULL == effect);
michael@0:     return effect;
michael@0: }
michael@0: 
michael@0: //////////////////////////////////////////////////////////////////////////////
michael@0: // Cubic
michael@0: //////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: class GrGLCubicEffect : public GrGLVertexEffect {
michael@0: public:
michael@0:     GrGLCubicEffect(const GrBackendEffectFactory&, const GrDrawEffect&);
michael@0: 
michael@0:     virtual void emitCode(GrGLFullShaderBuilder* builder,
michael@0:                           const GrDrawEffect& drawEffect,
michael@0:                           EffectKey key,
michael@0:                           const char* outputColor,
michael@0:                           const char* inputColor,
michael@0:                           const TransformedCoordsArray&,
michael@0:                           const TextureSamplerArray&) SK_OVERRIDE;
michael@0: 
michael@0:     static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&);
michael@0: 
michael@0:     virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE {}
michael@0: 
michael@0: private:
michael@0:     GrEffectEdgeType fEdgeType;
michael@0: 
michael@0:     typedef GrGLVertexEffect INHERITED;
michael@0: };
michael@0: 
michael@0: GrGLCubicEffect::GrGLCubicEffect(const GrBackendEffectFactory& factory,
michael@0:                                  const GrDrawEffect& drawEffect)
michael@0:     : INHERITED (factory) {
michael@0:     const GrCubicEffect& ce = drawEffect.castEffect<GrCubicEffect>();
michael@0:     fEdgeType = ce.getEdgeType();
michael@0: }
michael@0: 
michael@0: void GrGLCubicEffect::emitCode(GrGLFullShaderBuilder* builder,
michael@0:                                const GrDrawEffect& drawEffect,
michael@0:                                EffectKey key,
michael@0:                                const char* outputColor,
michael@0:                                const char* inputColor,
michael@0:                                const TransformedCoordsArray&,
michael@0:                                const TextureSamplerArray& samplers) {
michael@0:     const char *vsName, *fsName;
michael@0: 
michael@0:     builder->addVarying(kVec4f_GrSLType, "CubicCoeffs",
michael@0:                               &vsName, &fsName);
michael@0:     const SkString* attr0Name =
michael@0:         builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
michael@0:     builder->vsCodeAppendf("\t%s = %s;\n", vsName, attr0Name->c_str());
michael@0: 
michael@0:     builder->fsCodeAppend("\t\tfloat edgeAlpha;\n");
michael@0: 
michael@0:     switch (fEdgeType) {
michael@0:         case kHairlineAA_GrEffectEdgeType: {
michael@0:             SkAssertResult(builder->enableFeature(
michael@0:                     GrGLShaderBuilder::kStandardDerivatives_GLSLFeature));
michael@0:             builder->fsCodeAppendf("\t\tvec3 dklmdx = dFdx(%s.xyz);\n", fsName);
michael@0:             builder->fsCodeAppendf("\t\tvec3 dklmdy = dFdy(%s.xyz);\n", fsName);
michael@0:             builder->fsCodeAppendf("\t\tfloat dfdx =\n"
michael@0:                                    "\t\t3.0*%s.x*%s.x*dklmdx.x - %s.y*dklmdx.z - %s.z*dklmdx.y;\n",
michael@0:                                    fsName, fsName, fsName, fsName);
michael@0:             builder->fsCodeAppendf("\t\tfloat dfdy =\n"
michael@0:                                    "\t\t3.0*%s.x*%s.x*dklmdy.x - %s.y*dklmdy.z - %s.z*dklmdy.y;\n",
michael@0:                                    fsName, fsName, fsName, fsName);
michael@0:             builder->fsCodeAppend("\t\tvec2 gF = vec2(dfdx, dfdy);\n");
michael@0:             builder->fsCodeAppend("\t\tfloat gFM = sqrt(dot(gF, gF));\n");
michael@0:             builder->fsCodeAppendf("\t\tfloat func = %s.x*%s.x*%s.x - %s.y*%s.z;\n",
michael@0:                                    fsName, fsName, fsName, fsName, fsName);
michael@0:             builder->fsCodeAppend("\t\tfunc = abs(func);\n");
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = func / gFM;\n");
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = max(1.0 - edgeAlpha, 0.0);\n");
michael@0:             // Add line below for smooth cubic ramp
michael@0:             // builder->fsCodeAppend("\t\tedgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);\n");
michael@0:             break;
michael@0:         }
michael@0:         case kFillAA_GrEffectEdgeType: {
michael@0:             SkAssertResult(builder->enableFeature(
michael@0:                     GrGLShaderBuilder::kStandardDerivatives_GLSLFeature));
michael@0:             builder->fsCodeAppendf("\t\tvec3 dklmdx = dFdx(%s.xyz);\n", fsName);
michael@0:             builder->fsCodeAppendf("\t\tvec3 dklmdy = dFdy(%s.xyz);\n", fsName);
michael@0:             builder->fsCodeAppendf("\t\tfloat dfdx =\n"
michael@0:                                    "\t\t3.0*%s.x*%s.x*dklmdx.x - %s.y*dklmdx.z - %s.z*dklmdx.y;\n",
michael@0:                                    fsName, fsName, fsName, fsName);
michael@0:             builder->fsCodeAppendf("\t\tfloat dfdy =\n"
michael@0:                                    "\t\t3.0*%s.x*%s.x*dklmdy.x - %s.y*dklmdy.z - %s.z*dklmdy.y;\n",
michael@0:                                    fsName, fsName, fsName, fsName);
michael@0:             builder->fsCodeAppend("\t\tvec2 gF = vec2(dfdx, dfdy);\n");
michael@0:             builder->fsCodeAppend("\t\tfloat gFM = sqrt(dot(gF, gF));\n");
michael@0:             builder->fsCodeAppendf("\t\tfloat func = %s.x*%s.x*%s.x - %s.y*%s.z;\n",
michael@0:                                    fsName, fsName, fsName, fsName, fsName);
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = func / gFM;\n");
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = clamp(1.0 - edgeAlpha, 0.0, 1.0);\n");
michael@0:             // Add line below for smooth cubic ramp
michael@0:             // builder->fsCodeAppend("\t\tedgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);\n");
michael@0:             break;
michael@0:         }
michael@0:         case kFillBW_GrEffectEdgeType: {
michael@0:             builder->fsCodeAppendf("\t\tedgeAlpha = %s.x*%s.x*%s.x - %s.y*%s.z;\n",
michael@0:                                    fsName, fsName, fsName, fsName, fsName);
michael@0:             builder->fsCodeAppend("\t\tedgeAlpha = float(edgeAlpha < 0.0);\n");
michael@0:             break;
michael@0:         }
michael@0:         default:
michael@0:             GrCrash("Shouldn't get here");
michael@0:     }
michael@0: 
michael@0:     builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
michael@0:                            (GrGLSLExpr4(inputColor) * GrGLSLExpr1("edgeAlpha")).c_str());
michael@0: }
michael@0: 
michael@0: GrGLEffect::EffectKey GrGLCubicEffect::GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
michael@0:     const GrCubicEffect& ce = drawEffect.castEffect<GrCubicEffect>();
michael@0:     return ce.isAntiAliased() ? (ce.isFilled() ? 0x0 : 0x1) : 0x2;
michael@0: }
michael@0: 
michael@0: //////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: GrCubicEffect::~GrCubicEffect() {}
michael@0: 
michael@0: const GrBackendEffectFactory& GrCubicEffect::getFactory() const {
michael@0:     return GrTBackendEffectFactory<GrCubicEffect>::getInstance();
michael@0: }
michael@0: 
michael@0: GrCubicEffect::GrCubicEffect(GrEffectEdgeType edgeType) : GrVertexEffect() {
michael@0:     this->addVertexAttrib(kVec4f_GrSLType);
michael@0:     fEdgeType = edgeType;
michael@0: }
michael@0: 
michael@0: bool GrCubicEffect::onIsEqual(const GrEffect& other) const {
michael@0:     const GrCubicEffect& ce = CastEffect<GrCubicEffect>(other);
michael@0:     return (ce.fEdgeType == fEdgeType);
michael@0: }
michael@0: 
michael@0: //////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: GR_DEFINE_EFFECT_TEST(GrCubicEffect);
michael@0: 
michael@0: GrEffectRef* GrCubicEffect::TestCreate(SkRandom* random,
michael@0:                                              GrContext*,
michael@0:                                              const GrDrawTargetCaps& caps,
michael@0:                                              GrTexture*[]) {
michael@0:     GrEffectRef* effect;
michael@0:     do {
michael@0:         GrEffectEdgeType edgeType = static_cast<GrEffectEdgeType>(
michael@0:                                                     random->nextULessThan(kGrEffectEdgeTypeCnt));
michael@0:         effect = GrCubicEffect::Create(edgeType, caps);
michael@0:     } while (NULL == effect);
michael@0:     return effect;
michael@0: }