Revert of Preliminary attempt to remove batch tracker

src/gpu/effects/GrBezierEffect.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBezierEffect.h"
 
 #include "gl/GrGLProcessor.h"
 #include "gl/GrGLSL.h"
 #include "gl/GrGLGeometryProcessor.h"
 #include "gl/builders/GrGLProgramBuilder.h"
 
+struct ConicBatchTracker {
+    GrGPInput fInputColorType;
+    GrColor fColor;
+    uint8_t fCoverageScale;
+    bool fUsesLocalCoords;
+};
+
 class GrGLConicEffect : public GrGLGeometryProcessor {
 public:
     GrGLConicEffect(const GrGeometryProcessor&,
                     const GrBatchTracker&);
 
     void onEmitCode(EmitArgs&, GrGPArgs*) override;
 
     static inline void GenKey(const GrGeometryProcessor&,
                               const GrBatchTracker&,
                               const GrGLSLCaps&,
                               GrProcessorKeyBuilder*);
 
     virtual void setData(const GrGLProgramDataManager& pdman,
                          const GrPrimitiveProcessor& primProc,
                          const GrBatchTracker& bt) override {
         const GrConicEffect& ce = primProc.cast<GrConicEffect>();
         this->setUniformViewMatrix(pdman, ce.viewMatrix());
 
-        if (ce.color() != fColor) {
+        const ConicBatchTracker& local = bt.cast<ConicBatchTracker>();
+        if (kUniform_GrGPInput == local.fInputColorType && local.fColor != fColor) {
             GrGLfloat c[4];
-            GrColorToRGBAFloat(ce.color(), c);
+            GrColorToRGBAFloat(local.fColor, c);
             pdman.set4fv(fColorUniform, 1, c);
-            fColor = ce.color();
+            fColor = local.fColor;
         }
-
-        if (ce.coverageScale() != 0xff && ce.coverageScale() != fCoverageScale) {
-            pdman.set1f(fCoverageScaleUniform, GrNormalizeByteToFloat(ce.coverageScale()));
-            fCoverageScale = ce.coverageScale();
+        if (0xff != local.fCoverageScale && fCoverageScale != local.fCoverageScale) {
+            pdman.set1f(fCoverageScaleUniform, GrNormalizeByteToFloat(local.fCoverageScale));
+            fCoverageScale = local.fCoverageScale;
         }
     }
 
     void setTransformData(const GrPrimitiveProcessor& primProc,
                           const GrGLProgramDataManager& pdman,
                           int index,
                           const SkTArray<const GrCoordTransform*, true>& transforms) override {
         this->setTransformDataHelper<GrConicEffect>(primProc, pdman, index, transforms);
     }
 
@@ skipping 11 matching lines @@
                                  const GrBatchTracker& bt)
     : fColor(GrColor_ILLEGAL), fCoverageScale(0xff) {
     const GrConicEffect& ce = processor.cast<GrConicEffect>();
     fEdgeType = ce.getEdgeType();
 }
 
 void GrGLConicEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
     GrGLGPBuilder* pb = args.fPB;
     GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
     const GrConicEffect& gp = args.fGP.cast<GrConicEffect>();
+    const ConicBatchTracker& local = args.fBT.cast<ConicBatchTracker>();
 
     // emit attributes
     vsBuilder->emitAttributes(gp);
 
     GrGLVertToFrag v(kVec4f_GrSLType);
     args.fPB->addVarying("ConicCoeffs", &v);
     vsBuilder->codeAppendf("%s = %s;", v.vsOut(), gp.inConicCoeffs()->fName);
 
     // Setup pass through color
-    if (!gp.colorIgnored()) {
-        this->setupUniformColor(args.fPB, args.fOutputColor, &fColorUniform);
-    }
+    this->setupColorPassThrough(args.fPB, local.fInputColorType, args.fOutputColor, NULL,
+                                &fColorUniform);
 
     // Setup position
     this->setupPosition(pb, gpArgs, gp.inPosition()->fName, gp.viewMatrix());
 
     // emit transforms with position
     this->emitTransforms(pb, gpArgs->fPositionVar, gp.inPosition()->fName, gp.localMatrix(),
                          args.fTransformsIn, args.fTransformsOut);
 
     GrGLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
     fsBuilder->codeAppend("float edgeAlpha;");
@@ skipping 45 matching lines @@
         case kFillBW_GrProcessorEdgeType: {
             fsBuilder->codeAppendf("edgeAlpha = %s.x * %s.x - %s.y * %s.z;", v.fsIn(), v.fsIn(),
                                    v.fsIn(), v.fsIn());
             fsBuilder->codeAppend("edgeAlpha = float(edgeAlpha < 0.0);");
             break;
         }
         default:
             SkFAIL("Shouldn't get here");
     }
 
-    // TODO should we really be doing this?
-    if (gp.coverageScale() != 0xff) {
+    if (0xff != local.fCoverageScale) {
         const char* coverageScale;
         fCoverageScaleUniform = pb->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                                kFloat_GrSLType,
                                                kDefault_GrSLPrecision,
                                                "Coverage",
                                                &coverageScale);
         fsBuilder->codeAppendf("%s = vec4(%s * edgeAlpha);", args.fOutputCoverage, coverageScale);
     } else {
         fsBuilder->codeAppendf("%s = vec4(edgeAlpha);", args.fOutputCoverage);
     }
 }
 
 void GrGLConicEffect::GenKey(const GrGeometryProcessor& gp,
                              const GrBatchTracker& bt,
                              const GrGLSLCaps&,
                              GrProcessorKeyBuilder* b) {
     const GrConicEffect& ce = gp.cast<GrConicEffect>();
+    const ConicBatchTracker& local = bt.cast<ConicBatchTracker>();
     uint32_t key = ce.isAntiAliased() ? (ce.isFilled() ? 0x0 : 0x1) : 0x2;
-    key |= GrColor_ILLEGAL != ce.color() ? 0x4 : 0x0;
-    key |= 0xff != ce.coverageScale() ? 0x8 : 0x0;
-    key |= ce.usesLocalCoords() && ce.localMatrix().hasPerspective() ? 0x10 : 0x0;
+    key |= kUniform_GrGPInput == local.fInputColorType ? 0x4 : 0x0;
+    key |= 0xff != local.fCoverageScale ? 0x8 : 0x0;
+    key |= local.fUsesLocalCoords && ce.localMatrix().hasPerspective() ? 0x10 : 0x0;
     key |= ComputePosKey(ce.viewMatrix()) << 5;
     b->add32(key);
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 GrConicEffect::~GrConicEffect() {}
 
 void GrConicEffect::getGLProcessorKey(const GrBatchTracker& bt,
                                       const GrGLSLCaps& caps,
                                       GrProcessorKeyBuilder* b) const {
     GrGLConicEffect::GenKey(*this, bt, caps, b);
 }
 
 GrGLPrimitiveProcessor* GrConicEffect::createGLInstance(const GrBatchTracker& bt,
                                                         const GrGLSLCaps&) const {
     return SkNEW_ARGS(GrGLConicEffect, (*this, bt));
 }
 
 GrConicEffect::GrConicEffect(GrColor color, const SkMatrix& viewMatrix, uint8_t coverage,
-                             GrPrimitiveEdgeType edgeType, const SkMatrix& localMatrix,
-                             bool usesLocalCoords)
+                             GrPrimitiveEdgeType edgeType, const SkMatrix& localMatrix)
     : fColor(color)
     , fViewMatrix(viewMatrix)
     , fLocalMatrix(viewMatrix)
-    , fUsesLocalCoords(usesLocalCoords)
     , fCoverageScale(coverage)
     , fEdgeType(edgeType) {
     this->initClassID<GrConicEffect>();
     fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType));
     fInConicCoeffs = &this->addVertexAttrib(Attribute("inConicCoeffs",
-                                                      kVec4f_GrVertexAttribType));
+                                                        kVec4f_GrVertexAttribType));
+}
+
+void GrConicEffect::initBatchTracker(GrBatchTracker* bt, const GrPipelineInfo& init) const {
+    ConicBatchTracker* local = bt->cast<ConicBatchTracker>();
+    local->fInputColorType = GetColorInputType(&local->fColor, this->color(), init, false);
+    local->fCoverageScale = fCoverageScale;
+    local->fUsesLocalCoords = init.fUsesLocalCoords;
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrConicEffect);
 
 GrGeometryProcessor* GrConicEffect::TestCreate(SkRandom* random,
                                                GrContext*,
                                                const GrDrawTargetCaps& caps,
                                                GrTexture*[]) {
     GrGeometryProcessor* gp;
     do {
         GrPrimitiveEdgeType edgeType = static_cast<GrPrimitiveEdgeType>(
                                                     random->nextULessThan(kGrProcessorEdgeTypeCnt));
         gp = GrConicEffect::Create(GrRandomColor(random), GrTest::TestMatrix(random),
                                    edgeType, caps,
-                                   GrTest::TestMatrix(random), random->nextBool());
+                                   GrTest::TestMatrix(random));
     } while (NULL == gp);
     return gp;
 }
 
 //////////////////////////////////////////////////////////////////////////////
 // Quad
 //////////////////////////////////////////////////////////////////////////////
 
+struct QuadBatchTracker {
+    GrGPInput fInputColorType;
+    GrColor fColor;
+    uint8_t fCoverageScale;
+    bool fUsesLocalCoords;
+};
+
 class GrGLQuadEffect : public GrGLGeometryProcessor {
 public:
     GrGLQuadEffect(const GrGeometryProcessor&,
                    const GrBatchTracker&);
 
     void onEmitCode(EmitArgs&, GrGPArgs*) override;
 
     static inline void GenKey(const GrGeometryProcessor&,
                               const GrBatchTracker&,
                               const GrGLSLCaps&,
                               GrProcessorKeyBuilder*);
 
     virtual void setData(const GrGLProgramDataManager& pdman,
                          const GrPrimitiveProcessor& primProc,
                          const GrBatchTracker& bt) override {
         const GrQuadEffect& qe = primProc.cast<GrQuadEffect>();
         this->setUniformViewMatrix(pdman, qe.viewMatrix());
 
-        if (qe.color() != fColor) {
+        const QuadBatchTracker& local = bt.cast<QuadBatchTracker>();
+        if (kUniform_GrGPInput == local.fInputColorType && local.fColor != fColor) {
             GrGLfloat c[4];
-            GrColorToRGBAFloat(qe.color(), c);
+            GrColorToRGBAFloat(local.fColor, c);
             pdman.set4fv(fColorUniform, 1, c);
-            fColor = qe.color();
+            fColor = local.fColor;
         }
-
-        if (qe.coverageScale() != 0xff && qe.coverageScale() != fCoverageScale) {
-            pdman.set1f(fCoverageScaleUniform, GrNormalizeByteToFloat(qe.coverageScale()));
-            fCoverageScale = qe.coverageScale();
+        if (0xff != local.fCoverageScale && local.fCoverageScale != fCoverageScale) {
+            pdman.set1f(fCoverageScaleUniform, GrNormalizeByteToFloat(local.fCoverageScale));
+            fCoverageScale = local.fCoverageScale;
         }
     }
 
     void setTransformData(const GrPrimitiveProcessor& primProc,
                           const GrGLProgramDataManager& pdman,
                           int index,
                           const SkTArray<const GrCoordTransform*, true>& transforms) override {
         this->setTransformDataHelper<GrQuadEffect>(primProc, pdman, index, transforms);
     }
 
@@ skipping 11 matching lines @@
                                const GrBatchTracker& bt)
     : fColor(GrColor_ILLEGAL), fCoverageScale(0xff) {
     const GrQuadEffect& ce = processor.cast<GrQuadEffect>();
     fEdgeType = ce.getEdgeType();
 }
 
 void GrGLQuadEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
     GrGLGPBuilder* pb = args.fPB;
     GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
     const GrQuadEffect& gp = args.fGP.cast<GrQuadEffect>();
+    const QuadBatchTracker& local = args.fBT.cast<QuadBatchTracker>();
 
     // emit attributes
     vsBuilder->emitAttributes(gp);
 
     GrGLVertToFrag v(kVec4f_GrSLType);
     args.fPB->addVarying("HairQuadEdge", &v);
     vsBuilder->codeAppendf("%s = %s;", v.vsOut(), gp.inHairQuadEdge()->fName);
 
     // Setup pass through color
-    if (!gp.colorIgnored()) {
-        this->setupUniformColor(args.fPB, args.fOutputColor, &fColorUniform);
-    }
+    this->setupColorPassThrough(args.fPB, local.fInputColorType, args.fOutputColor, NULL,
+                                &fColorUniform);
 
     // Setup position
     this->setupPosition(pb, gpArgs, gp.inPosition()->fName, gp.viewMatrix());
 
     // emit transforms with position
     this->emitTransforms(pb, gpArgs->fPositionVar, gp.inPosition()->fName, gp.localMatrix(),
                          args.fTransformsIn, args.fTransformsOut);
 
     GrGLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
     fsBuilder->codeAppendf("float edgeAlpha;");
@@ skipping 31 matching lines @@
         }
         case kFillBW_GrProcessorEdgeType: {
             fsBuilder->codeAppendf("edgeAlpha = (%s.x * %s.x - %s.y);", v.fsIn(), v.fsIn(), v.fsIn());
             fsBuilder->codeAppend("edgeAlpha = float(edgeAlpha < 0.0);");
             break;
         }
         default:
             SkFAIL("Shouldn't get here");
     }
 
-    if (0xff != gp.coverageScale()) {
+    if (0xff != local.fCoverageScale) {
         const char* coverageScale;
         fCoverageScaleUniform = pb->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                           kFloat_GrSLType,
                                           kDefault_GrSLPrecision,
                                           "Coverage",
                                           &coverageScale);
         fsBuilder->codeAppendf("%s = vec4(%s * edgeAlpha);", args.fOutputCoverage, coverageScale);
     } else {
         fsBuilder->codeAppendf("%s = vec4(edgeAlpha);", args.fOutputCoverage);
     }
 }
 
 void GrGLQuadEffect::GenKey(const GrGeometryProcessor& gp,
                             const GrBatchTracker& bt,
                             const GrGLSLCaps&,
                             GrProcessorKeyBuilder* b) {
     const GrQuadEffect& ce = gp.cast<GrQuadEffect>();
+    const QuadBatchTracker& local = bt.cast<QuadBatchTracker>();
     uint32_t key = ce.isAntiAliased() ? (ce.isFilled() ? 0x0 : 0x1) : 0x2;
-    key |= ce.color() != GrColor_ILLEGAL ? 0x4 : 0x0;
-    key |= ce.coverageScale() != 0xff ? 0x8 : 0x0;
-    key |= ce.usesLocalCoords() && ce.localMatrix().hasPerspective() ? 0x10 : 0x0;
+    key |= kUniform_GrGPInput == local.fInputColorType ? 0x4 : 0x0;
+    key |= 0xff != local.fCoverageScale ? 0x8 : 0x0;
+    key |= local.fUsesLocalCoords && ce.localMatrix().hasPerspective() ? 0x10 : 0x0;
     key |= ComputePosKey(ce.viewMatrix()) << 5;
     b->add32(key);
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 GrQuadEffect::~GrQuadEffect() {}
 
 void GrQuadEffect::getGLProcessorKey(const GrBatchTracker& bt,
                                      const GrGLSLCaps& caps,
                                      GrProcessorKeyBuilder* b) const {
     GrGLQuadEffect::GenKey(*this, bt, caps, b);
 }
 
 GrGLPrimitiveProcessor* GrQuadEffect::createGLInstance(const GrBatchTracker& bt,
                                                        const GrGLSLCaps&) const {
     return SkNEW_ARGS(GrGLQuadEffect, (*this, bt));
 }
 
 GrQuadEffect::GrQuadEffect(GrColor color, const SkMatrix& viewMatrix, uint8_t coverage,
-                           GrPrimitiveEdgeType edgeType, const SkMatrix& localMatrix,
-                           bool usesLocalCoords)
+                           GrPrimitiveEdgeType edgeType, const SkMatrix& localMatrix)
     : fColor(color)
     , fViewMatrix(viewMatrix)
     , fLocalMatrix(localMatrix)
-    , fUsesLocalCoords(usesLocalCoords)
     , fCoverageScale(coverage)
     , fEdgeType(edgeType) {
     this->initClassID<GrQuadEffect>();
     fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType));
     fInHairQuadEdge = &this->addVertexAttrib(Attribute("inHairQuadEdge",
                                                         kVec4f_GrVertexAttribType));
 }
 
+void GrQuadEffect::initBatchTracker(GrBatchTracker* bt, const GrPipelineInfo& init) const {
+    QuadBatchTracker* local = bt->cast<QuadBatchTracker>();
+    local->fInputColorType = GetColorInputType(&local->fColor, this->color(), init, false);
+    local->fCoverageScale = fCoverageScale;
+    local->fUsesLocalCoords = init.fUsesLocalCoords;
+}
+
 //////////////////////////////////////////////////////////////////////////////
 
 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrQuadEffect);
 
 GrGeometryProcessor* GrQuadEffect::TestCreate(SkRandom* random,
                                               GrContext*,
                                               const GrDrawTargetCaps& caps,
                                               GrTexture*[]) {
     GrGeometryProcessor* gp;
     do {
         GrPrimitiveEdgeType edgeType = static_cast<GrPrimitiveEdgeType>(
                 random->nextULessThan(kGrProcessorEdgeTypeCnt));
         gp = GrQuadEffect::Create(GrRandomColor(random),
                                   GrTest::TestMatrix(random),
                                   edgeType, caps,
-                                  GrTest::TestMatrix(random),
-                                  random->nextBool());
+                                  GrTest::TestMatrix(random));
     } while (NULL == gp);
     return gp;
 }
 
 //////////////////////////////////////////////////////////////////////////////
 // Cubic
 //////////////////////////////////////////////////////////////////////////////
 
+struct CubicBatchTracker {
+    GrGPInput fInputColorType;
+    GrColor fColor;
+    bool fUsesLocalCoords;
+};
+
 class GrGLCubicEffect : public GrGLGeometryProcessor {
 public:
     GrGLCubicEffect(const GrGeometryProcessor&,
                     const GrBatchTracker&);
 
     void onEmitCode(EmitArgs&, GrGPArgs*) override;
 
     static inline void GenKey(const GrGeometryProcessor&,
                               const GrBatchTracker&,
                               const GrGLSLCaps&,
                               GrProcessorKeyBuilder*);
 
     virtual void setData(const GrGLProgramDataManager& pdman,
                          const GrPrimitiveProcessor& primProc,
                          const GrBatchTracker& bt) override {
         const GrCubicEffect& ce = primProc.cast<GrCubicEffect>();
         this->setUniformViewMatrix(pdman, ce.viewMatrix());
 
-        if (ce.color() != fColor) {
+        const CubicBatchTracker& local = bt.cast<CubicBatchTracker>();
+        if (kUniform_GrGPInput == local.fInputColorType && local.fColor != fColor) {
             GrGLfloat c[4];
-            GrColorToRGBAFloat(ce.color(), c);
+            GrColorToRGBAFloat(local.fColor, c);
             pdman.set4fv(fColorUniform, 1, c);
-            fColor = ce.color();
+            fColor = local.fColor;
         }
     }
 
 private:
     GrColor fColor;
     GrPrimitiveEdgeType fEdgeType;
     UniformHandle fColorUniform;
 
     typedef GrGLGeometryProcessor INHERITED;
 };
 
 GrGLCubicEffect::GrGLCubicEffect(const GrGeometryProcessor& processor,
                                  const GrBatchTracker&)
     : fColor(GrColor_ILLEGAL) {
     const GrCubicEffect& ce = processor.cast<GrCubicEffect>();
     fEdgeType = ce.getEdgeType();
 }
 
 void GrGLCubicEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
     GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
     const GrCubicEffect& gp = args.fGP.cast<GrCubicEffect>();
+    const CubicBatchTracker& local = args.fBT.cast<CubicBatchTracker>();
 
     // emit attributes
     vsBuilder->emitAttributes(gp);
 
     GrGLVertToFrag v(kVec4f_GrSLType);
     args.fPB->addVarying("CubicCoeffs", &v, kHigh_GrSLPrecision);
     vsBuilder->codeAppendf("%s = %s;", v.vsOut(), gp.inCubicCoeffs()->fName);
 
     // Setup pass through color
-    if (!gp.colorIgnored()) {
-        this->setupUniformColor(args.fPB, args.fOutputColor, &fColorUniform);
-    }
+    this->setupColorPassThrough(args.fPB, local.fInputColorType, args.fOutputColor, NULL,
+                                &fColorUniform);
 
     // Setup position
     this->setupPosition(args.fPB, gpArgs, gp.inPosition()->fName, gp.viewMatrix());
 
     // emit transforms with position
     this->emitTransforms(args.fPB, gpArgs->fPositionVar, gp.inPosition()->fName, args.fTransformsIn,
                          args.fTransformsOut);
 
     GrGLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
 
@@ skipping 80 matching lines @@
 
 
     fsBuilder->codeAppendf("%s = vec4(%s);", args.fOutputCoverage, edgeAlpha.c_str());
 }
 
 void GrGLCubicEffect::GenKey(const GrGeometryProcessor& gp,
                              const GrBatchTracker& bt,
                              const GrGLSLCaps&,
                              GrProcessorKeyBuilder* b) {
     const GrCubicEffect& ce = gp.cast<GrCubicEffect>();
+    const CubicBatchTracker& local = bt.cast<CubicBatchTracker>();
     uint32_t key = ce.isAntiAliased() ? (ce.isFilled() ? 0x0 : 0x1) : 0x2;
-    key |= ce.color() != GrColor_ILLEGAL ? 0x4 : 0x8;
+    key |= kUniform_GrGPInput == local.fInputColorType ? 0x4 : 0x8;
     key |= ComputePosKey(ce.viewMatrix()) << 5;
     b->add32(key);
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 GrCubicEffect::~GrCubicEffect() {}
 
 void GrCubicEffect::getGLProcessorKey(const GrBatchTracker& bt,
                                       const GrGLSLCaps& caps,
@@ skipping 10 matching lines @@
                              GrPrimitiveEdgeType edgeType)
     : fColor(color)
     , fViewMatrix(viewMatrix)
     , fEdgeType(edgeType) {
     this->initClassID<GrCubicEffect>();
     fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType));
     fInCubicCoeffs = &this->addVertexAttrib(Attribute("inCubicCoeffs",
                                                         kVec4f_GrVertexAttribType));
 }
 
+void GrCubicEffect::initBatchTracker(GrBatchTracker* bt, const GrPipelineInfo& init) const {
+    CubicBatchTracker* local = bt->cast<CubicBatchTracker>();
+    local->fInputColorType = GetColorInputType(&local->fColor, this->color(), init, false);
+    local->fUsesLocalCoords = init.fUsesLocalCoords;
+}
+
 //////////////////////////////////////////////////////////////////////////////
 
 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrCubicEffect);
 
 GrGeometryProcessor* GrCubicEffect::TestCreate(SkRandom* random,
                                                GrContext*,
                                                const GrDrawTargetCaps& caps,
                                                GrTexture*[]) {
     GrGeometryProcessor* gp;
     do {
         GrPrimitiveEdgeType edgeType = static_cast<GrPrimitiveEdgeType>(
                                                     random->nextULessThan(kGrProcessorEdgeTypeCnt));
         gp = GrCubicEffect::Create(GrRandomColor(random),
                                    GrTest::TestMatrix(random), edgeType, caps);
     } while (NULL == gp);
     return gp;
 }