src/gpu/effects/GrBezierEffect.cpp

   1 /*
   2  * Copyright 2013 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "GrBezierEffect.h"
   9
  10 #include "gl/GrGLGeometryProcessor.h"
  11 #include "glsl/GrGLSLFragmentProcessor.h"
  12 #include "glsl/GrGLSLProgramBuilder.h"
  13 #include "glsl/GrGLSLProgramDataManager.h"
  14 #include "glsl/GrGLSLUtil.h"
  15
  16 class GrGLConicEffect : public GrGLGeometryProcessor {
  17 public:
  18     GrGLConicEffect(const GrGeometryProcessor&);
  19
  20     void onEmitCode(EmitArgs&, GrGPArgs*) override;
  21
  22     static inline void GenKey(const GrGeometryProcessor&,
  23                               const GrGLSLCaps&,
  24                               GrProcessorKeyBuilder*);
  25
  26     void setData(const GrGLSLProgramDataManager& pdman,
  27                  const GrPrimitiveProcessor& primProc) override {
  28         const GrConicEffect& ce = primProc.cast<GrConicEffect>();
  29
  30         if (!ce.viewMatrix().isIdentity() && !fViewMatrix.cheapEqualTo(ce.viewMatrix())) {
  31             fViewMatrix = ce.viewMatrix();
  32             float viewMatrix[3 * 3];
  33             GrGLSLGetMatrix<3>(viewMatrix, fViewMatrix);
  34             pdman.setMatrix3f(fViewMatrixUniform, viewMatrix);
  35         }
  36
  37         if (ce.color() != fColor) {
  38             float c[4];
  39             GrColorToRGBAFloat(ce.color(), c);
  40             pdman.set4fv(fColorUniform, 1, c);
  41             fColor = ce.color();
  42         }
  43
  44         if (ce.coverageScale() != 0xff && ce.coverageScale() != fCoverageScale) {
  45             pdman.set1f(fCoverageScaleUniform, GrNormalizeByteToFloat(ce.coverageScale()));
  46             fCoverageScale = ce.coverageScale();
  47         }
  48     }
  49
  50     void setTransformData(const GrPrimitiveProcessor& primProc,
  51                           const GrGLSLProgramDataManager& pdman,
  52                           int index,
  53                           const SkTArray<const GrCoordTransform*, true>& transforms) override {
  54         this->setTransformDataHelper<GrConicEffect>(primProc, pdman, index, transforms);
  55     }
  56
  57 private:
  58     SkMatrix fViewMatrix;
  59     GrColor fColor;
  60     uint8_t fCoverageScale;
  61     GrPrimitiveEdgeType fEdgeType;
  62     UniformHandle fColorUniform;
  63     UniformHandle fCoverageScaleUniform;
  64     UniformHandle fViewMatrixUniform;
  65
  66     typedef GrGLGeometryProcessor INHERITED;
  67 };
  68
  69 GrGLConicEffect::GrGLConicEffect(const GrGeometryProcessor& processor)
  70     : fViewMatrix(SkMatrix::InvalidMatrix()), fColor(GrColor_ILLEGAL), fCoverageScale(0xff) {
  71     const GrConicEffect& ce = processor.cast<GrConicEffect>();
  72     fEdgeType = ce.getEdgeType();
  73 }
  74
  75 void GrGLConicEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
  76     GrGLSLGPBuilder* pb = args.fPB;
  77     GrGLSLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
  78     const GrConicEffect& gp = args.fGP.cast<GrConicEffect>();
  79
  80     // emit attributes
  81     vsBuilder->emitAttributes(gp);
  82
  83     GrGLSLVertToFrag v(kVec4f_GrSLType);
  84     args.fPB->addVarying("ConicCoeffs", &v);
  85     vsBuilder->codeAppendf("%s = %s;", v.vsOut(), gp.inConicCoeffs()->fName);
  86
  87     // Setup pass through color
  88     if (!gp.colorIgnored()) {
  89         this->setupUniformColor(args.fPB, args.fOutputColor, &fColorUniform);
  90     }
  91
  92     // Setup position
  93     this->setupPosition(pb, gpArgs, gp.inPosition()->fName, gp.viewMatrix(), &fViewMatrixUniform);
  94
  95     // emit transforms with position
  96     this->emitTransforms(pb, gpArgs->fPositionVar, gp.inPosition()->fName, gp.localMatrix(),
  97                          args.fTransformsIn, args.fTransformsOut);
  98
  99     GrGLSLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
 100     fsBuilder->codeAppend("float edgeAlpha;");
 101
 102     switch (fEdgeType) {
 103         case kHairlineAA_GrProcessorEdgeType: {
 104             SkAssertResult(fsBuilder->enableFeature(
 105                     GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 106             fsBuilder->codeAppendf("vec3 dklmdx = dFdx(%s.xyz);", v.fsIn());
 107             fsBuilder->codeAppendf("vec3 dklmdy = dFdy(%s.xyz);", v.fsIn());
 108             fsBuilder->codeAppendf("float dfdx ="
 109                                    "2.0 * %s.x * dklmdx.x - %s.y * dklmdx.z - %s.z * dklmdx.y;",
 110                                    v.fsIn(), v.fsIn(), v.fsIn());
 111             fsBuilder->codeAppendf("float dfdy ="
 112                                    "2.0 * %s.x * dklmdy.x - %s.y * dklmdy.z - %s.z * dklmdy.y;",
 113                                    v.fsIn(), v.fsIn(), v.fsIn());
 114             fsBuilder->codeAppend("vec2 gF = vec2(dfdx, dfdy);");
 115             fsBuilder->codeAppend("float gFM = sqrt(dot(gF, gF));");
 116             fsBuilder->codeAppendf("float func = %s.x*%s.x - %s.y*%s.z;", v.fsIn(), v.fsIn(),
 117                                    v.fsIn(), v.fsIn());
 118             fsBuilder->codeAppend("func = abs(func);");
 119             fsBuilder->codeAppend("edgeAlpha = func / gFM;");
 120             fsBuilder->codeAppend("edgeAlpha = max(1.0 - edgeAlpha, 0.0);");
 121             // Add line below for smooth cubic ramp
 122             // fsBuilder->codeAppend("edgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);");
 123             break;
 124         }
 125         case kFillAA_GrProcessorEdgeType: {
 126             SkAssertResult(fsBuilder->enableFeature(
 127                     GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 128             fsBuilder->codeAppendf("vec3 dklmdx = dFdx(%s.xyz);", v.fsIn());
 129             fsBuilder->codeAppendf("vec3 dklmdy = dFdy(%s.xyz);", v.fsIn());
 130             fsBuilder->codeAppendf("float dfdx ="
 131                                    "2.0 * %s.x * dklmdx.x - %s.y * dklmdx.z - %s.z * dklmdx.y;",
 132                                    v.fsIn(), v.fsIn(), v.fsIn());
 133             fsBuilder->codeAppendf("float dfdy ="
 134                                    "2.0 * %s.x * dklmdy.x - %s.y * dklmdy.z - %s.z * dklmdy.y;",
 135                                    v.fsIn(), v.fsIn(), v.fsIn());
 136             fsBuilder->codeAppend("vec2 gF = vec2(dfdx, dfdy);");
 137             fsBuilder->codeAppend("float gFM = sqrt(dot(gF, gF));");
 138             fsBuilder->codeAppendf("float func = %s.x * %s.x - %s.y * %s.z;", v.fsIn(), v.fsIn(),
 139                                    v.fsIn(), v.fsIn());
 140             fsBuilder->codeAppend("edgeAlpha = func / gFM;");
 141             fsBuilder->codeAppend("edgeAlpha = clamp(1.0 - edgeAlpha, 0.0, 1.0);");
 142             // Add line below for smooth cubic ramp
 143             // fsBuilder->codeAppend("edgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);");
 144             break;
 145         }
 146         case kFillBW_GrProcessorEdgeType: {
 147             fsBuilder->codeAppendf("edgeAlpha = %s.x * %s.x - %s.y * %s.z;", v.fsIn(), v.fsIn(),
 148                                    v.fsIn(), v.fsIn());
 149             fsBuilder->codeAppend("edgeAlpha = float(edgeAlpha < 0.0);");
 150             break;
 151         }
 152         default:
 153             SkFAIL("Shouldn't get here");
 154     }
 155
 156     // TODO should we really be doing this?
 157     if (gp.coverageScale() != 0xff) {
 158         const char* coverageScale;
 159         fCoverageScaleUniform = pb->addUniform(GrGLSLProgramBuilder::kFragment_Visibility,
 160                                                kFloat_GrSLType,
 161                                                kDefault_GrSLPrecision,
 162                                                "Coverage",
 163                                                &coverageScale);
 164         fsBuilder->codeAppendf("%s = vec4(%s * edgeAlpha);", args.fOutputCoverage, coverageScale);
 165     } else {
 166         fsBuilder->codeAppendf("%s = vec4(edgeAlpha);", args.fOutputCoverage);
 167     }
 168 }
 169
 170 void GrGLConicEffect::GenKey(const GrGeometryProcessor& gp,
 171                              const GrGLSLCaps&,
 172                              GrProcessorKeyBuilder* b) {
 173     const GrConicEffect& ce = gp.cast<GrConicEffect>();
 174     uint32_t key = ce.isAntiAliased() ? (ce.isFilled() ? 0x0 : 0x1) : 0x2;
 175     key |= GrColor_ILLEGAL != ce.color() ? 0x4 : 0x0;
 176     key |= 0xff != ce.coverageScale() ? 0x8 : 0x0;
 177     key |= ce.usesLocalCoords() && ce.localMatrix().hasPerspective() ? 0x10 : 0x0;
 178     key |= ComputePosKey(ce.viewMatrix()) << 5;
 179     b->add32(key);
 180 }
 181
 182 //////////////////////////////////////////////////////////////////////////////
 183
 184 GrConicEffect::~GrConicEffect() {}
 185
 186 void GrConicEffect::getGLProcessorKey(const GrGLSLCaps& caps,
 187                                       GrProcessorKeyBuilder* b) const {
 188     GrGLConicEffect::GenKey(*this, caps, b);
 189 }
 190
 191 GrGLPrimitiveProcessor* GrConicEffect::createGLInstance(const GrGLSLCaps&) const {
 192     return new GrGLConicEffect(*this);
 193 }
 194
 195 GrConicEffect::GrConicEffect(GrColor color, const SkMatrix& viewMatrix, uint8_t coverage,
 196                              GrPrimitiveEdgeType edgeType, const SkMatrix& localMatrix,
 197                              bool usesLocalCoords)
 198     : fColor(color)
 199     , fViewMatrix(viewMatrix)
 200     , fLocalMatrix(viewMatrix)
 201     , fUsesLocalCoords(usesLocalCoords)
 202     , fCoverageScale(coverage)
 203     , fEdgeType(edgeType) {
 204     this->initClassID<GrConicEffect>();
 205     fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType,
 206                                                    kHigh_GrSLPrecision));
 207     fInConicCoeffs = &this->addVertexAttrib(Attribute("inConicCoeffs",
 208                                                       kVec4f_GrVertexAttribType));
 209 }
 210
 211 //////////////////////////////////////////////////////////////////////////////
 212
 213 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrConicEffect);
 214
 215 const GrGeometryProcessor* GrConicEffect::TestCreate(GrProcessorTestData* d) {
 216     GrGeometryProcessor* gp;
 217     do {
 218         GrPrimitiveEdgeType edgeType =
 219                 static_cast<GrPrimitiveEdgeType>(
 220                         d->fRandom->nextULessThan(kGrProcessorEdgeTypeCnt));
 221         gp = GrConicEffect::Create(GrRandomColor(d->fRandom), GrTest::TestMatrix(d->fRandom),
 222                                    edgeType, *d->fCaps,
 223                                    GrTest::TestMatrix(d->fRandom), d->fRandom->nextBool());
 224     } while (nullptr == gp);
 225     return gp;
 226 }
 227
 228 //////////////////////////////////////////////////////////////////////////////
 229 // Quad
 230 //////////////////////////////////////////////////////////////////////////////
 231
 232 class GrGLQuadEffect : public GrGLGeometryProcessor {
 233 public:
 234     GrGLQuadEffect(const GrGeometryProcessor&);
 235
 236     void onEmitCode(EmitArgs&, GrGPArgs*) override;
 237
 238     static inline void GenKey(const GrGeometryProcessor&,
 239                               const GrGLSLCaps&,
 240                               GrProcessorKeyBuilder*);
 241
 242     void setData(const GrGLSLProgramDataManager& pdman,
 243                  const GrPrimitiveProcessor& primProc) override {
 244         const GrQuadEffect& qe = primProc.cast<GrQuadEffect>();
 245
 246         if (!qe.viewMatrix().isIdentity() && !fViewMatrix.cheapEqualTo(qe.viewMatrix())) {
 247             fViewMatrix = qe.viewMatrix();
 248             float viewMatrix[3 * 3];
 249             GrGLSLGetMatrix<3>(viewMatrix, fViewMatrix);
 250             pdman.setMatrix3f(fViewMatrixUniform, viewMatrix);
 251         }
 252
 253         if (qe.color() != fColor) {
 254             float c[4];
 255             GrColorToRGBAFloat(qe.color(), c);
 256             pdman.set4fv(fColorUniform, 1, c);
 257             fColor = qe.color();
 258         }
 259
 260         if (qe.coverageScale() != 0xff && qe.coverageScale() != fCoverageScale) {
 261             pdman.set1f(fCoverageScaleUniform, GrNormalizeByteToFloat(qe.coverageScale()));
 262             fCoverageScale = qe.coverageScale();
 263         }
 264     }
 265
 266     void setTransformData(const GrPrimitiveProcessor& primProc,
 267                           const GrGLSLProgramDataManager& pdman,
 268                           int index,
 269                           const SkTArray<const GrCoordTransform*, true>& transforms) override {
 270         this->setTransformDataHelper<GrQuadEffect>(primProc, pdman, index, transforms);
 271     }
 272
 273 private:
 274     SkMatrix fViewMatrix;
 275     GrColor fColor;
 276     uint8_t fCoverageScale;
 277     GrPrimitiveEdgeType fEdgeType;
 278     UniformHandle fColorUniform;
 279     UniformHandle fCoverageScaleUniform;
 280     UniformHandle fViewMatrixUniform;
 281
 282     typedef GrGLGeometryProcessor INHERITED;
 283 };
 284
 285 GrGLQuadEffect::GrGLQuadEffect(const GrGeometryProcessor& processor)
 286     : fViewMatrix(SkMatrix::InvalidMatrix()), fColor(GrColor_ILLEGAL), fCoverageScale(0xff) {
 287     const GrQuadEffect& ce = processor.cast<GrQuadEffect>();
 288     fEdgeType = ce.getEdgeType();
 289 }
 290
 291 void GrGLQuadEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
 292     GrGLSLGPBuilder* pb = args.fPB;
 293     GrGLSLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
 294     const GrQuadEffect& gp = args.fGP.cast<GrQuadEffect>();
 295
 296     // emit attributes
 297     vsBuilder->emitAttributes(gp);
 298
 299     GrGLSLVertToFrag v(kVec4f_GrSLType);
 300     args.fPB->addVarying("HairQuadEdge", &v);
 301     vsBuilder->codeAppendf("%s = %s;", v.vsOut(), gp.inHairQuadEdge()->fName);
 302
 303     // Setup pass through color
 304     if (!gp.colorIgnored()) {
 305         this->setupUniformColor(args.fPB, args.fOutputColor, &fColorUniform);
 306     }
 307
 308     // Setup position
 309     this->setupPosition(pb, gpArgs, gp.inPosition()->fName, gp.viewMatrix(), &fViewMatrixUniform);
 310
 311     // emit transforms with position
 312     this->emitTransforms(pb, gpArgs->fPositionVar, gp.inPosition()->fName, gp.localMatrix(),
 313                          args.fTransformsIn, args.fTransformsOut);
 314
 315     GrGLSLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
 316     fsBuilder->codeAppendf("float edgeAlpha;");
 317
 318     switch (fEdgeType) {
 319         case kHairlineAA_GrProcessorEdgeType: {
 320             SkAssertResult(fsBuilder->enableFeature(
 321                     GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 322             fsBuilder->codeAppendf("vec2 duvdx = dFdx(%s.xy);", v.fsIn());
 323             fsBuilder->codeAppendf("vec2 duvdy = dFdy(%s.xy);", v.fsIn());
 324             fsBuilder->codeAppendf("vec2 gF = vec2(2.0 * %s.x * duvdx.x - duvdx.y,"
 325                                    "               2.0 * %s.x * duvdy.x - duvdy.y);",
 326                                    v.fsIn(), v.fsIn());
 327             fsBuilder->codeAppendf("edgeAlpha = (%s.x * %s.x - %s.y);", v.fsIn(), v.fsIn(), v.fsIn());
 328             fsBuilder->codeAppend("edgeAlpha = sqrt(edgeAlpha * edgeAlpha / dot(gF, gF));");
 329             fsBuilder->codeAppend("edgeAlpha = max(1.0 - edgeAlpha, 0.0);");
 330             // Add line below for smooth cubic ramp
 331             // fsBuilder->codeAppend("edgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);");
 332             break;
 333         }
 334         case kFillAA_GrProcessorEdgeType: {
 335             SkAssertResult(fsBuilder->enableFeature(
 336                     GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 337             fsBuilder->codeAppendf("vec2 duvdx = dFdx(%s.xy);", v.fsIn());
 338             fsBuilder->codeAppendf("vec2 duvdy = dFdy(%s.xy);", v.fsIn());
 339             fsBuilder->codeAppendf("vec2 gF = vec2(2.0 * %s.x * duvdx.x - duvdx.y,"
 340                                    "               2.0 * %s.x * duvdy.x - duvdy.y);",
 341                                    v.fsIn(), v.fsIn());
 342             fsBuilder->codeAppendf("edgeAlpha = (%s.x * %s.x - %s.y);", v.fsIn(), v.fsIn(), v.fsIn());
 343             fsBuilder->codeAppend("edgeAlpha = edgeAlpha / sqrt(dot(gF, gF));");
 344             fsBuilder->codeAppend("edgeAlpha = clamp(1.0 - edgeAlpha, 0.0, 1.0);");
 345             // Add line below for smooth cubic ramp
 346             // fsBuilder->codeAppend("edgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);");
 347             break;
 348         }
 349         case kFillBW_GrProcessorEdgeType: {
 350             fsBuilder->codeAppendf("edgeAlpha = (%s.x * %s.x - %s.y);", v.fsIn(), v.fsIn(), v.fsIn());
 351             fsBuilder->codeAppend("edgeAlpha = float(edgeAlpha < 0.0);");
 352             break;
 353         }
 354         default:
 355             SkFAIL("Shouldn't get here");
 356     }
 357
 358     if (0xff != gp.coverageScale()) {
 359         const char* coverageScale;
 360         fCoverageScaleUniform = pb->addUniform(GrGLSLProgramBuilder::kFragment_Visibility,
 361                                           kFloat_GrSLType,
 362                                           kDefault_GrSLPrecision,
 363                                           "Coverage",
 364                                           &coverageScale);
 365         fsBuilder->codeAppendf("%s = vec4(%s * edgeAlpha);", args.fOutputCoverage, coverageScale);
 366     } else {
 367         fsBuilder->codeAppendf("%s = vec4(edgeAlpha);", args.fOutputCoverage);
 368     }
 369 }
 370
 371 void GrGLQuadEffect::GenKey(const GrGeometryProcessor& gp,
 372                             const GrGLSLCaps&,
 373                             GrProcessorKeyBuilder* b) {
 374     const GrQuadEffect& ce = gp.cast<GrQuadEffect>();
 375     uint32_t key = ce.isAntiAliased() ? (ce.isFilled() ? 0x0 : 0x1) : 0x2;
 376     key |= ce.color() != GrColor_ILLEGAL ? 0x4 : 0x0;
 377     key |= ce.coverageScale() != 0xff ? 0x8 : 0x0;
 378     key |= ce.usesLocalCoords() && ce.localMatrix().hasPerspective() ? 0x10 : 0x0;
 379     key |= ComputePosKey(ce.viewMatrix()) << 5;
 380     b->add32(key);
 381 }
 382
 383 //////////////////////////////////////////////////////////////////////////////
 384
 385 GrQuadEffect::~GrQuadEffect() {}
 386
 387 void GrQuadEffect::getGLProcessorKey(const GrGLSLCaps& caps,
 388                                      GrProcessorKeyBuilder* b) const {
 389     GrGLQuadEffect::GenKey(*this, caps, b);
 390 }
 391
 392 GrGLPrimitiveProcessor* GrQuadEffect::createGLInstance(const GrGLSLCaps&) const {
 393     return new GrGLQuadEffect(*this);
 394 }
 395
 396 GrQuadEffect::GrQuadEffect(GrColor color, const SkMatrix& viewMatrix, uint8_t coverage,
 397                            GrPrimitiveEdgeType edgeType, const SkMatrix& localMatrix,
 398                            bool usesLocalCoords)
 399     : fColor(color)
 400     , fViewMatrix(viewMatrix)
 401     , fLocalMatrix(localMatrix)
 402     , fUsesLocalCoords(usesLocalCoords)
 403     , fCoverageScale(coverage)
 404     , fEdgeType(edgeType) {
 405     this->initClassID<GrQuadEffect>();
 406     fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType,
 407                                                    kHigh_GrSLPrecision));
 408     fInHairQuadEdge = &this->addVertexAttrib(Attribute("inHairQuadEdge",
 409                                                         kVec4f_GrVertexAttribType));
 410 }
 411
 412 //////////////////////////////////////////////////////////////////////////////
 413
 414 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrQuadEffect);
 415
 416 const GrGeometryProcessor* GrQuadEffect::TestCreate(GrProcessorTestData* d) {
 417     GrGeometryProcessor* gp;
 418     do {
 419         GrPrimitiveEdgeType edgeType = static_cast<GrPrimitiveEdgeType>(
 420                 d->fRandom->nextULessThan(kGrProcessorEdgeTypeCnt));
 421         gp = GrQuadEffect::Create(GrRandomColor(d->fRandom),
 422                                   GrTest::TestMatrix(d->fRandom),
 423                                   edgeType, *d->fCaps,
 424                                   GrTest::TestMatrix(d->fRandom),
 425                                   d->fRandom->nextBool());
 426     } while (nullptr == gp);
 427     return gp;
 428 }
 429
 430 //////////////////////////////////////////////////////////////////////////////
 431 // Cubic
 432 //////////////////////////////////////////////////////////////////////////////
 433
 434 class GrGLCubicEffect : public GrGLGeometryProcessor {
 435 public:
 436     GrGLCubicEffect(const GrGeometryProcessor&);
 437
 438     void onEmitCode(EmitArgs&, GrGPArgs*) override;
 439
 440     static inline void GenKey(const GrGeometryProcessor&,
 441                               const GrGLSLCaps&,
 442                               GrProcessorKeyBuilder*);
 443
 444     void setData(const GrGLSLProgramDataManager& pdman,
 445                  const GrPrimitiveProcessor& primProc) override {
 446         const GrCubicEffect& ce = primProc.cast<GrCubicEffect>();
 447
 448         if (!ce.viewMatrix().isIdentity() && !fViewMatrix.cheapEqualTo(ce.viewMatrix())) {
 449             fViewMatrix = ce.viewMatrix();
 450             float viewMatrix[3 * 3];
 451             GrGLSLGetMatrix<3>(viewMatrix, fViewMatrix);
 452             pdman.setMatrix3f(fViewMatrixUniform, viewMatrix);
 453         }
 454
 455         if (ce.color() != fColor) {
 456             float c[4];
 457             GrColorToRGBAFloat(ce.color(), c);
 458             pdman.set4fv(fColorUniform, 1, c);
 459             fColor = ce.color();
 460         }
 461     }
 462
 463 private:
 464     SkMatrix fViewMatrix;
 465     GrColor fColor;
 466     GrPrimitiveEdgeType fEdgeType;
 467     UniformHandle fColorUniform;
 468     UniformHandle fViewMatrixUniform;
 469
 470     typedef GrGLGeometryProcessor INHERITED;
 471 };
 472
 473 GrGLCubicEffect::GrGLCubicEffect(const GrGeometryProcessor& processor)
 474     : fViewMatrix(SkMatrix::InvalidMatrix()), fColor(GrColor_ILLEGAL) {
 475     const GrCubicEffect& ce = processor.cast<GrCubicEffect>();
 476     fEdgeType = ce.getEdgeType();
 477 }
 478
 479 void GrGLCubicEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
 480     GrGLSLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
 481     const GrCubicEffect& gp = args.fGP.cast<GrCubicEffect>();
 482
 483     // emit attributes
 484     vsBuilder->emitAttributes(gp);
 485
 486     GrGLSLVertToFrag v(kVec4f_GrSLType);
 487     args.fPB->addVarying("CubicCoeffs", &v, kHigh_GrSLPrecision);
 488     vsBuilder->codeAppendf("%s = %s;", v.vsOut(), gp.inCubicCoeffs()->fName);
 489
 490     // Setup pass through color
 491     if (!gp.colorIgnored()) {
 492         this->setupUniformColor(args.fPB, args.fOutputColor, &fColorUniform);
 493     }
 494
 495     // Setup position
 496     this->setupPosition(args.fPB, gpArgs, gp.inPosition()->fName, gp.viewMatrix(),
 497                         &fViewMatrixUniform);
 498
 499     // emit transforms with position
 500     this->emitTransforms(args.fPB, gpArgs->fPositionVar, gp.inPosition()->fName, args.fTransformsIn,
 501                          args.fTransformsOut);
 502
 503     GrGLSLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
 504
 505     GrGLSLShaderVar edgeAlpha("edgeAlpha", kFloat_GrSLType, 0, kHigh_GrSLPrecision);
 506     GrGLSLShaderVar dklmdx("dklmdx", kVec3f_GrSLType, 0, kHigh_GrSLPrecision);
 507     GrGLSLShaderVar dklmdy("dklmdy", kVec3f_GrSLType, 0, kHigh_GrSLPrecision);
 508     GrGLSLShaderVar dfdx("dfdx", kFloat_GrSLType, 0, kHigh_GrSLPrecision);
 509     GrGLSLShaderVar dfdy("dfdy", kFloat_GrSLType, 0, kHigh_GrSLPrecision);
 510     GrGLSLShaderVar gF("gF", kVec2f_GrSLType, 0, kHigh_GrSLPrecision);
 511     GrGLSLShaderVar gFM("gFM", kFloat_GrSLType, 0, kHigh_GrSLPrecision);
 512     GrGLSLShaderVar func("func", kFloat_GrSLType, 0, kHigh_GrSLPrecision);
 513
 514     fsBuilder->declAppend(edgeAlpha);
 515     fsBuilder->declAppend(dklmdx);
 516     fsBuilder->declAppend(dklmdy);
 517     fsBuilder->declAppend(dfdx);
 518     fsBuilder->declAppend(dfdy);
 519     fsBuilder->declAppend(gF);
 520     fsBuilder->declAppend(gFM);
 521     fsBuilder->declAppend(func);
 522
 523     switch (fEdgeType) {
 524         case kHairlineAA_GrProcessorEdgeType: {
 525             SkAssertResult(fsBuilder->enableFeature(
 526                     GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 527             fsBuilder->codeAppendf("%s = dFdx(%s.xyz);", dklmdx.c_str(), v.fsIn());
 528             fsBuilder->codeAppendf("%s = dFdy(%s.xyz);", dklmdy.c_str(), v.fsIn());
 529             fsBuilder->codeAppendf("%s = 3.0 * %s.x * %s.x * %s.x - %s.y * %s.z - %s.z * %s.y;",
 530                                    dfdx.c_str(), v.fsIn(), v.fsIn(), dklmdx.c_str(), v.fsIn(),
 531                                    dklmdx.c_str(), v.fsIn(), dklmdx.c_str());
 532             fsBuilder->codeAppendf("%s = 3.0 * %s.x * %s.x * %s.x - %s.y * %s.z - %s.z * %s.y;",
 533                                    dfdy.c_str(), v.fsIn(), v.fsIn(), dklmdy.c_str(), v.fsIn(),
 534                                    dklmdy.c_str(), v.fsIn(), dklmdy.c_str());
 535             fsBuilder->codeAppendf("%s = vec2(%s, %s);", gF.c_str(), dfdx.c_str(), dfdy.c_str());
 536             fsBuilder->codeAppendf("%s = sqrt(dot(%s, %s));", gFM.c_str(), gF.c_str(), gF.c_str());
 537             fsBuilder->codeAppendf("%s = %s.x * %s.x * %s.x - %s.y * %s.z;",
 538                                    func.c_str(), v.fsIn(), v.fsIn(), v.fsIn(), v.fsIn(), v.fsIn());
 539             fsBuilder->codeAppendf("%s = abs(%s);", func.c_str(), func.c_str());
 540             fsBuilder->codeAppendf("%s = %s / %s;",
 541                                    edgeAlpha.c_str(), func.c_str(), gFM.c_str());
 542             fsBuilder->codeAppendf("%s = max(1.0 - %s, 0.0);",
 543                                    edgeAlpha.c_str(), edgeAlpha.c_str());
 544             // Add line below for smooth cubic ramp
 545             // fsBuilder->codeAppendf("%s = %s * %s * (3.0 - 2.0 * %s);",
 546             //                        edgeAlpha.c_str(), edgeAlpha.c_str(), edgeAlpha.c_str(),
 547             //                        edgeAlpha.c_str());
 548             break;
 549         }
 550         case kFillAA_GrProcessorEdgeType: {
 551             SkAssertResult(fsBuilder->enableFeature(
 552                     GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 553             fsBuilder->codeAppendf("%s = dFdx(%s.xyz);", dklmdx.c_str(), v.fsIn());
 554             fsBuilder->codeAppendf("%s = dFdy(%s.xyz);", dklmdy.c_str(), v.fsIn());
 555             fsBuilder->codeAppendf("%s ="
 556                                    "3.0 * %s.x * %s.x * %s.x - %s.y * %s.z - %s.z * %s.y;",
 557                                    dfdx.c_str(), v.fsIn(), v.fsIn(), dklmdx.c_str(), v.fsIn(),
 558                                    dklmdx.c_str(), v.fsIn(), dklmdx.c_str());
 559             fsBuilder->codeAppendf("%s = 3.0 * %s.x * %s.x * %s.x - %s.y * %s.z - %s.z * %s.y;",
 560                                    dfdy.c_str(), v.fsIn(), v.fsIn(), dklmdy.c_str(), v.fsIn(),
 561                                    dklmdy.c_str(), v.fsIn(), dklmdy.c_str());
 562             fsBuilder->codeAppendf("%s = vec2(%s, %s);", gF.c_str(), dfdx.c_str(), dfdy.c_str());
 563             fsBuilder->codeAppendf("%s = sqrt(dot(%s, %s));", gFM.c_str(), gF.c_str(), gF.c_str());
 564             fsBuilder->codeAppendf("%s = %s.x * %s.x * %s.x - %s.y * %s.z;",
 565                                    func.c_str(), v.fsIn(), v.fsIn(), v.fsIn(), v.fsIn(), v.fsIn());
 566             fsBuilder->codeAppendf("%s = %s / %s;",
 567                                    edgeAlpha.c_str(), func.c_str(), gFM.c_str());
 568             fsBuilder->codeAppendf("%s = clamp(1.0 - %s, 0.0, 1.0);",
 569                                    edgeAlpha.c_str(), edgeAlpha.c_str());
 570             // Add line below for smooth cubic ramp
 571             // fsBuilder->codeAppendf("%s = %s * %s * (3.0 - 2.0 * %s);",
 572             //                        edgeAlpha.c_str(), edgeAlpha.c_str(), edgeAlpha.c_str(),
 573             //                        edgeAlpha.c_str());
 574             break;
 575         }
 576         case kFillBW_GrProcessorEdgeType: {
 577             fsBuilder->codeAppendf("%s = %s.x * %s.x * %s.x - %s.y * %s.z;",
 578                                    edgeAlpha.c_str(), v.fsIn(), v.fsIn(), v.fsIn(), v.fsIn(), v.fsIn());
 579             fsBuilder->codeAppendf("%s = float(%s < 0.0);", edgeAlpha.c_str(), edgeAlpha.c_str());
 580             break;
 581         }
 582         default:
 583             SkFAIL("Shouldn't get here");
 584     }
 585
 586
 587     fsBuilder->codeAppendf("%s = vec4(%s);", args.fOutputCoverage, edgeAlpha.c_str());
 588 }
 589
 590 void GrGLCubicEffect::GenKey(const GrGeometryProcessor& gp,
 591                              const GrGLSLCaps&,
 592                              GrProcessorKeyBuilder* b) {
 593     const GrCubicEffect& ce = gp.cast<GrCubicEffect>();
 594     uint32_t key = ce.isAntiAliased() ? (ce.isFilled() ? 0x0 : 0x1) : 0x2;
 595     key |= ce.color() != GrColor_ILLEGAL ? 0x4 : 0x8;
 596     key |= ComputePosKey(ce.viewMatrix()) << 5;
 597     b->add32(key);
 598 }
 599
 600 //////////////////////////////////////////////////////////////////////////////
 601
 602 GrCubicEffect::~GrCubicEffect() {}
 603
 604 void GrCubicEffect::getGLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const {
 605     GrGLCubicEffect::GenKey(*this, caps, b);
 606 }
 607
 608 GrGLPrimitiveProcessor* GrCubicEffect::createGLInstance(const GrGLSLCaps&) const {
 609     return new GrGLCubicEffect(*this);
 610 }
 611
 612 GrCubicEffect::GrCubicEffect(GrColor color, const SkMatrix& viewMatrix,
 613                              GrPrimitiveEdgeType edgeType)
 614     : fColor(color)
 615     , fViewMatrix(viewMatrix)
 616     , fEdgeType(edgeType) {
 617     this->initClassID<GrCubicEffect>();
 618     fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType,
 619                                                    kHigh_GrSLPrecision));
 620     fInCubicCoeffs = &this->addVertexAttrib(Attribute("inCubicCoeffs",
 621                                                         kVec4f_GrVertexAttribType));
 622 }
 623
 624 //////////////////////////////////////////////////////////////////////////////
 625
 626 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrCubicEffect);
 627
 628 const GrGeometryProcessor* GrCubicEffect::TestCreate(GrProcessorTestData* d) {
 629     GrGeometryProcessor* gp;
 630     do {
 631         GrPrimitiveEdgeType edgeType =
 632                 static_cast<GrPrimitiveEdgeType>(
 633                         d->fRandom->nextULessThan(kGrProcessorEdgeTypeCnt));
 634         gp = GrCubicEffect::Create(GrRandomColor(d->fRandom),
 635                                    GrTest::TestMatrix(d->fRandom), edgeType, *d->fCaps);
 636     } while (nullptr == gp);
 637     return gp;
 638 }
 639