Move most of the transform logic into the primitive processors

src/gpu/GrGeometryProcessor.cpp

 /*
  * 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 "GrGeometryProcessor.h"
 
+#include "GrCoordTransform.h"
+#include "GrInvariantOutput.h"
 #include "gl/GrGLGeometryProcessor.h"
-#include "GrInvariantOutput.h"
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
+/**
+ * The key for an individual coord transform is made up of a matrix type, a precision, and a bit
+ * that indicates the source of the input coords.
+ */
+enum {
+    kMatrixTypeKeyBits   = 1,
+    kMatrixTypeKeyMask   = (1 << kMatrixTypeKeyBits) - 1,
+
+    kPrecisionBits       = 2,
+    kPrecisionShift      = kMatrixTypeKeyBits,
+
+    kPositionCoords_Flag = (1 << (kPrecisionShift + kPrecisionBits)),
+    kDeviceCoords_Flag   = kPositionCoords_Flag + kPositionCoords_Flag,
+
+    kTransformKeyBits    = kMatrixTypeKeyBits + kPrecisionBits + 2,
+};
+
+GR_STATIC_ASSERT(kHigh_GrSLPrecision < (1 << kPrecisionBits));
+
+/**
+ * We specialize the vertex code for each of these matrix types.
+ */
+enum MatrixType {
+    kNoPersp_MatrixType  = 0,
+    kGeneral_MatrixType  = 1,
+};
+
+uint32_t
+GrPrimitiveProcessor::getTransformKey(const SkTArray<const GrCoordTransform*, true>& coords) const {
+    uint32_t totalKey = 0;
+    for (int t = 0; t < coords.count(); ++t) {
+        uint32_t key = 0;
+        const GrCoordTransform* coordTransform = coords[t];
+        if (coordTransform->getMatrix().hasPerspective()) {
+            key |= kGeneral_MatrixType;
+        } else {
+            key |= kNoPersp_MatrixType;
+        }
+
+        if (kLocal_GrCoordSet == coordTransform->sourceCoords() &&
+            !this->hasExplicitLocalCoords()) {
+            key |= kPositionCoords_Flag;
+        } else if (kDevice_GrCoordSet == coordTransform->sourceCoords()) {
+            key |= kDeviceCoords_Flag;
+        }
+
+        GR_STATIC_ASSERT(kGrSLPrecisionCount <= (1 << kPrecisionBits));
+        key |= (coordTransform->precision() << kPrecisionShift);
+
+        key <<= kTransformKeyBits * t;
+
+        SkASSERT(0 == (totalKey & key)); // keys for each transform ought not to overlap
+        totalKey |= key;
+    }
+    return totalKey;
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
 void GrGeometryProcessor::getInvariantOutputColor(GrInitInvariantOutput* out) const {
     if (fHasVertexColor) {
         if (fOpaqueVertexColors) {
             out->setUnknownOpaqueFourComponents();
         } else {
             out->setUnknownFourComponents();
         }
     } else {
         out->setKnownFourComponents(fColor);
     }
     this->onGetInvariantOutputColor(out);
 }
 
 void GrGeometryProcessor::getInvariantOutputCoverage(GrInitInvariantOutput* out) const {
     this->onGetInvariantOutputCoverage(out);
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 #include "gl/builders/GrGLProgramBuilder.h"
 
-void GrGLGeometryProcessor::setupColorPassThrough(GrGLGPBuilder* pb,
-                                                  GrGPInput inputType,
-                                                  const char* outputName,
-                                                  const GrGeometryProcessor::GrAttribute* colorAttr,
-                                                  UniformHandle* colorUniform) {
+SkMatrix GrGLPrimitiveProcessor::GetTransformMatrix(const SkMatrix& localMatrix,
+                                                    const GrCoordTransform& coordTransform) {
+    SkMatrix combined;
+    // We only apply the localmatrix to localcoords
+    if (kLocal_GrCoordSet == coordTransform.sourceCoords()) {
+        combined.setConcat(coordTransform.getMatrix(), localMatrix);
+    } else {
+        combined = coordTransform.getMatrix();
+    }
+    if (coordTransform.reverseY()) {
+        // combined.postScale(1,-1);
+        // combined.postTranslate(0,1);
+        combined.set(SkMatrix::kMSkewY,
+            combined[SkMatrix::kMPersp0] - combined[SkMatrix::kMSkewY]);
+        combined.set(SkMatrix::kMScaleY,
+            combined[SkMatrix::kMPersp1] - combined[SkMatrix::kMScaleY]);
+        combined.set(SkMatrix::kMTransY,
+            combined[SkMatrix::kMPersp2] - combined[SkMatrix::kMTransY]);
+    }
+    return combined;
+}
+
+void
+GrGLPrimitiveProcessor::setupColorPassThrough(GrGLGPBuilder* pb,
+                                              GrGPInput inputType,
+                                              const char* outputName,
+                                              const GrGeometryProcessor::GrAttribute* colorAttr,
+                                              UniformHandle* colorUniform) {
     GrGLGPFragmentBuilder* fs = pb->getFragmentShaderBuilder();
     if (kUniform_GrGPInput == inputType) {
         SkASSERT(colorUniform);
         const char* stagedLocalVarName;
         *colorUniform = pb->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                        kVec4f_GrSLType,
                                        kDefault_GrSLPrecision,
                                        "Color",
                                        &stagedLocalVarName);
         fs->codeAppendf("%s = %s;", outputName, stagedLocalVarName);
     } else if (kAttribute_GrGPInput == inputType) {
         SkASSERT(colorAttr);
         pb->addPassThroughAttribute(colorAttr, outputName);
     } else if (kAllOnes_GrGPInput == inputType) {
         fs->codeAppendf("%s = vec4(1);", outputName);
     }
 }
 
-void GrGLGeometryProcessor::addUniformViewMatrix(GrGLGPBuilder* pb) {
+void GrGLPrimitiveProcessor::addUniformViewMatrix(GrGLGPBuilder* pb) {
     fViewMatrixUniform = pb->addUniform(GrGLProgramBuilder::kVertex_Visibility,
                                         kMat33f_GrSLType, kDefault_GrSLPrecision,
                                         "uViewM",
                                         &fViewMatrixName);
 }
 
-void GrGLGeometryProcessor::setUniformViewMatrix(const GrGLProgramDataManager& pdman,
-                                                 const SkMatrix& viewMatrix) {
+void GrGLPrimitiveProcessor::setUniformViewMatrix(const GrGLProgramDataManager& pdman,
+                                                  const SkMatrix& viewMatrix) {
     if (!fViewMatrix.cheapEqualTo(viewMatrix)) {
         SkASSERT(fViewMatrixUniform.isValid());
         fViewMatrix = viewMatrix;
 
         GrGLfloat viewMatrix[3 * 3];
         GrGLGetMatrix<3>(viewMatrix, fViewMatrix);
         pdman.setMatrix3f(fViewMatrixUniform, viewMatrix);
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
+
+void GrGLGeometryProcessor::emitCode(EmitArgs& args) {
+    GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
+    vsBuilder->codeAppendf("vec3 %s;", this->position());
+    this->onEmitCode(args);
+    vsBuilder->transformToNormalizedDeviceSpace(this->position());
+}
+
+void GrGLGeometryProcessor::emitTransforms(GrGLGPBuilder* pb,
+                                           const char* position,
+                                           const char* localCoords,
+                                           const SkMatrix& localMatrix,
+                                           const TransformsIn& tin,
+                                           TransformsOut* tout) {
+    GrGLVertexBuilder* vb = pb->getVertexShaderBuilder();
+    tout->push_back_n(tin.count());
+    fInstalledTransforms.push_back_n(tin.count());
+    for (int i = 0; i < tin.count(); i++) {
+        const ProcCoords& coordTransforms = tin[i];
+        fInstalledTransforms[i].push_back_n(coordTransforms.count());
+        for (int t = 0; t < coordTransforms.count(); t++) {
+            SkString strUniName("StageMatrix");
+            strUniName.appendf("_%i_%i", i, t);
+            GrSLType varyingType;
+
+            GrCoordSet coordType = coordTransforms[t]->sourceCoords();
+            uint32_t type = coordTransforms[t]->getMatrix().getType();
+            if (kLocal_GrCoordSet == coordType) {
+                type |= localMatrix.getType();
+            }
+            varyingType = SkToBool(SkMatrix::kPerspective_Mask & type) ? kVec3f_GrSLType :
+                                                                         kVec2f_GrSLType;
+            GrSLPrecision precision = coordTransforms[t]->precision();
+
+            const char* uniName;
+            fInstalledTransforms[i][t].fHandle =
+                    pb->addUniform(GrGLProgramBuilder::kVertex_Visibility,
+                                   kMat33f_GrSLType, precision,
+                                   strUniName.c_str(),
+                                   &uniName).toShaderBuilderIndex();
+
+            SkString strVaryingName("MatrixCoord");
+            strVaryingName.appendf("_%i_%i", i, t);
+
+            GrGLVertToFrag v(varyingType);
+            pb->addVarying(strVaryingName.c_str(), &v, precision);
+
+            SkASSERT(kVec2f_GrSLType == varyingType || kVec3f_GrSLType == varyingType);
+            SkNEW_APPEND_TO_TARRAY(&(*tout)[i], GrGLProcessor::TransformedCoords,
+                                   (SkString(v.fsIn()), varyingType));
+
+            // varying = matrix * coords (logically)
+            if (kDevice_GrCoordSet == coordType) {
+                if (kVec2f_GrSLType == varyingType) {
+                    vb->codeAppendf("%s = (%s * %s).xy;", v.vsOut(), uniName, position);
+                } else {
+                    vb->codeAppendf("%s = %s * %s;", v.vsOut(), uniName, position);
+                }
+            } else {
+                if (kVec2f_GrSLType == varyingType) {
+                    vb->codeAppendf("%s = (%s * vec3(%s, 1)).xy;", v.vsOut(), uniName, localCoords);
+                } else {
+                    vb->codeAppendf("%s = %s * vec3(%s, 1);", v.vsOut(), uniName, localCoords);
+                }
+            }
+        }
+    }
+}
+
+
+void
+GrGLGeometryProcessor::setTransformData(const GrPrimitiveProcessor* primProc,
+                                        const GrGLProgramDataManager& pdman,
+                                        int index,
+                                        const SkTArray<const GrCoordTransform*, true>& transforms) {
+    SkSTArray<2, Transform, true>& procTransforms = fInstalledTransforms[index];
+    int numTransforms = transforms.count();
+    for (int t = 0; t < numTransforms; ++t) {
+        SkASSERT(procTransforms[t].fHandle.isValid());
+        const SkMatrix& transform = GetTransformMatrix(primProc->localMatrix(), *transforms[t]);
+        if (!procTransforms[t].fCurrentValue.cheapEqualTo(transform)) {
+            pdman.setSkMatrix(procTransforms[t].fHandle.convertToUniformHandle(), transform);
+            procTransforms[t].fCurrentValue = transform;
+        }
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+#include "gl/GrGLGpu.h"
+#include "gl/GrGLPathRendering.h"
+
 struct PathBatchTracker {
     GrGPInput fInputColorType;
     GrGPInput fInputCoverageType;
     GrColor fColor;
     bool fUsesLocalCoords;
 };
 
-class GrGLPathProcessor : public GrGLGeometryProcessor {
+GrGLPathProcessor::GrGLPathProcessor(const GrPathProcessor&, const GrBatchTracker&)
+    : fColor(GrColor_ILLEGAL) {}
+
+void GrGLPathProcessor::emitCode(EmitArgs& args) {
+    GrGLGPBuilder* pb = args.fPB;
+    GrGLGPFragmentBuilder* fs = args.fPB->getFragmentShaderBuilder();
+    const PathBatchTracker& local = args.fBT.cast<PathBatchTracker>();
+
+    // emit transforms
+    this->emitTransforms(args.fPB, args.fTransformsIn, args.fTransformsOut);
+
+    // Setup uniform color
+    if (kUniform_GrGPInput == local.fInputColorType) {
+        const char* stagedLocalVarName;
+        fColorUniform = pb->addUniform(GrGLProgramBuilder::kFragment_Visibility,
+                                       kVec4f_GrSLType,
+                                       kDefault_GrSLPrecision,
+                                       "Color",
+                                       &stagedLocalVarName);
+        fs->codeAppendf("%s = %s;", args.fOutputColor, stagedLocalVarName);
+    }
+
+    // setup constant solid coverage
+    if (kAllOnes_GrGPInput == local.fInputCoverageType) {
+        fs->codeAppendf("%s = vec4(1);", args.fOutputCoverage);
+    }
+}
+
+void GrGLPathProcessor::GenKey(const GrPathProcessor&,
+                               const GrBatchTracker& bt,
+                               const GrGLCaps&,
+                               GrProcessorKeyBuilder* b) {
+    const PathBatchTracker& local = bt.cast<PathBatchTracker>();
+    b->add32(local.fInputColorType | local.fInputCoverageType << 16);
+}
+
+void GrGLPathProcessor::setData(const GrGLProgramDataManager& pdman,
+                                const GrPrimitiveProcessor& primProc,
+                                const GrBatchTracker& bt) {
+    const PathBatchTracker& local = bt.cast<PathBatchTracker>();
+    if (kUniform_GrGPInput == local.fInputColorType && local.fColor != fColor) {
+        GrGLfloat c[4];
+        GrColorToRGBAFloat(local.fColor, c);
+        pdman.set4fv(fColorUniform, 1, c);
+        fColor = local.fColor;
+    }
+}
+
+class GrGLLegacyPathProcessor : public GrGLPathProcessor {
 public:
-    GrGLPathProcessor(const GrPathProcessor&, const GrBatchTracker&)
-        : fColor(GrColor_ILLEGAL) {}
-
-    void emitCode(const EmitArgs& args) SK_OVERRIDE {
-        GrGLGPBuilder* pb = args.fPB;
-        GrGLGPFragmentBuilder* fs = args.fPB->getFragmentShaderBuilder();
-        const PathBatchTracker& local = args.fBT.cast<PathBatchTracker>();
-
-        // Setup uniform color
-        if (kUniform_GrGPInput == local.fInputColorType) {
-            const char* stagedLocalVarName;
-            fColorUniform = pb->addUniform(GrGLProgramBuilder::kFragment_Visibility,
-                                           kVec4f_GrSLType,
-                                           kDefault_GrSLPrecision,
-                                           "Color",
-                                           &stagedLocalVarName);
-            fs->codeAppendf("%s = %s;", args.fOutputColor, stagedLocalVarName);
-        }
-
-        // setup constant solid coverage
-        if (kAllOnes_GrGPInput == local.fInputCoverageType) {
-            fs->codeAppendf("%s = vec4(1);", args.fOutputCoverage);
-        }
-    }
-
-    static inline void GenKey(const GrPathProcessor&,
-                              const GrBatchTracker& bt,
-                              const GrGLCaps&,
-                              GrProcessorKeyBuilder* b) {
-        const PathBatchTracker& local = bt.cast<PathBatchTracker>();
-        b->add32(local.fInputColorType | local.fInputCoverageType << 16);
-    }
-
-    void setData(const GrGLProgramDataManager& pdman,
-                 const GrPrimitiveProcessor& primProc,
-                 const GrBatchTracker& bt) SK_OVERRIDE {
-        const PathBatchTracker& local = bt.cast<PathBatchTracker>();
-        if (kUniform_GrGPInput == local.fInputColorType && local.fColor != fColor) {
-            GrGLfloat c[4];
-            GrColorToRGBAFloat(local.fColor, c);
-            pdman.set4fv(fColorUniform, 1, c);
-            fColor = local.fColor;
-        }
+    GrGLLegacyPathProcessor(const GrPathProcessor& pathProc, const GrBatchTracker& bt,
+                            int maxTexCoords)
+        : INHERITED(pathProc, bt)
+        , fMaxTexCoords(maxTexCoords)
+        , fTexCoordSetCnt(0) {}
+
+    int addTexCoordSets(int count) {
+        int firstFreeCoordSet = fTexCoordSetCnt;
+        fTexCoordSetCnt += count;
+        SkASSERT(fMaxTexCoords >= fTexCoordSetCnt);
+        return firstFreeCoordSet;
+    }
+
+    void emitTransforms(GrGLGPBuilder*, const TransformsIn& tin, TransformsOut* tout) SK_OVERRIDE {
+        tout->push_back_n(tin.count());
+        fInstalledTransforms.push_back_n(tin.count());
+        for (int i = 0; i < tin.count(); i++) {
+            const ProcCoords& coordTransforms = tin[i];
+            int texCoordIndex = this->addTexCoordSets(coordTransforms.count());
+
+            // Use the first uniform location as the texcoord index.
+            fInstalledTransforms[i].push_back_n(1);
+            fInstalledTransforms[i][0].fHandle = ShaderVarHandle(texCoordIndex);
+
+            SkString name;
+            for (int t = 0; t < coordTransforms.count(); ++t) {
+                GrSLType type = coordTransforms[t]->getMatrix().hasPerspective() ? kVec3f_GrSLType :
+                                                                                   kVec2f_GrSLType;
+
+                name.printf("%s(gl_TexCoord[%i])", GrGLSLTypeString(type), texCoordIndex++);
+                SkNEW_APPEND_TO_TARRAY(&(*tout)[i], GrGLProcessor::TransformedCoords, (name, type));
+            }
+        }
+    }
+
+    void setTransformData(const GrPrimitiveProcessor* primProc,
+                          int index,
+                          const SkTArray<const GrCoordTransform*, true>& transforms,
+                          GrGLPathRendering* glpr,
+                          GrGLuint) SK_OVERRIDE {
+        // We've hidden the texcoord index in the first entry of the transforms array for each
+        // effect
+        int texCoordIndex = fInstalledTransforms[index][0].fHandle.handle();
+        for (int t = 0; t < transforms.count(); ++t) {
+            const SkMatrix& transform = GetTransformMatrix(primProc->localMatrix(), *transforms[t]);
+            GrGLPathRendering::PathTexGenComponents components =
+                    GrGLPathRendering::kST_PathTexGenComponents;
+            if (transform.hasPerspective()) {
+                components = GrGLPathRendering::kSTR_PathTexGenComponents;
+            }
+            glpr->enablePathTexGen(texCoordIndex++, components, transform);
+        }
+    }
+
+    void didSetData(GrGLPathRendering* glpr) SK_OVERRIDE {
+        glpr->flushPathTexGenSettings(fTexCoordSetCnt);
     }
 
 private:
-    UniformHandle fColorUniform;
-    GrColor fColor;
-
-    typedef GrGLGeometryProcessor INHERITED;
+    int fMaxTexCoords;
+    int fTexCoordSetCnt;
+
+    typedef GrGLPathProcessor INHERITED;
 };
 
+class GrGLNormalPathProcessor : public GrGLPathProcessor {
+public:
+    GrGLNormalPathProcessor(const GrPathProcessor& pathProc, const GrBatchTracker& bt)
+        : INHERITED(pathProc, bt) {}
+
+    void emitTransforms(GrGLGPBuilder* pb, const TransformsIn& tin,
+                        TransformsOut* tout) SK_OVERRIDE {
+        tout->push_back_n(tin.count());
+        fInstalledTransforms.push_back_n(tin.count());
+        for (int i = 0; i < tin.count(); i++) {
+            const ProcCoords& coordTransforms = tin[i];
+            fInstalledTransforms[i].push_back_n(coordTransforms.count());
+            for (int t = 0; t < coordTransforms.count(); t++) {
+                GrSLType varyingType =
+                        coordTransforms[t]->getMatrix().hasPerspective() ? kVec3f_GrSLType :
+                                                                           kVec2f_GrSLType;
+
+                const char* varyingName = "MatrixCoord";
+                SkString suffixedVaryingName;
+                if (0 != t) {
+                    suffixedVaryingName.append(varyingName);
+                    suffixedVaryingName.appendf("_%i", t);
+                    varyingName = suffixedVaryingName.c_str();
+                }
+                GrGLVertToFrag v(varyingType);
+                pb->addVarying(varyingName, &v);
+                SeparableVaryingInfo& varyingInfo = fSeparableVaryingInfos.push_back();
+                varyingInfo.fVariable = pb->getFragmentShaderBuilder()->fInputs.back();
+                varyingInfo.fLocation = fSeparableVaryingInfos.count() - 1;
+                varyingInfo.fType = varyingType;
+                fInstalledTransforms[i][t].fHandle = ShaderVarHandle(varyingInfo.fLocation);
+                fInstalledTransforms[i][t].fType = varyingType;
+
+                SkNEW_APPEND_TO_TARRAY(&(*tout)[i], GrGLProcessor::TransformedCoords,
+                                       (SkString(v.fsIn()), varyingType));
+            }
+        }
+    }
+
+    void resolveSeparableVaryings(GrGLGpu* gpu, GrGLuint programId) {
+        int count = fSeparableVaryingInfos.count();
+        for (int i = 0; i < count; ++i) {
+            GrGLint location;
+            GR_GL_CALL_RET(gpu->glInterface(),
+                           location,
+                           GetProgramResourceLocation(programId,
+                                                      GR_GL_FRAGMENT_INPUT,
+                                                      fSeparableVaryingInfos[i].fVariable.c_str()));
+            fSeparableVaryingInfos[i].fLocation = location;
+        }
+    }
+
+    void setTransformData(const GrPrimitiveProcessor* primProc,
+                          int index,
+                          const SkTArray<const GrCoordTransform*, true>& coordTransforms,
+                          GrGLPathRendering* glpr,
+                          GrGLuint programID) SK_OVERRIDE {
+        SkSTArray<2, Transform, true>& transforms = fInstalledTransforms[index];
+        int numTransforms = transforms.count();
+        for (int t = 0; t < numTransforms; ++t) {
+            SkASSERT(transforms[t].fHandle.isValid());
+            const SkMatrix& transform = GetTransformMatrix(primProc->localMatrix(),
+                                                           *coordTransforms[t]);
+            if (transforms[t].fCurrentValue.cheapEqualTo(transform)) {
+                continue;
+            }
+            transforms[t].fCurrentValue = transform;
+            const SeparableVaryingInfo& fragmentInput =
+                    fSeparableVaryingInfos[transforms[t].fHandle.handle()];
+            SkASSERT(transforms[t].fType == kVec2f_GrSLType ||
+                     transforms[t].fType == kVec3f_GrSLType);
+            unsigned components = transforms[t].fType == kVec2f_GrSLType ? 2 : 3;
+            glpr->setProgramPathFragmentInputTransform(programID,
+                                                       fragmentInput.fLocation,
+                                                       GR_GL_OBJECT_LINEAR,
+                                                       components,
+                                                       transform);
+        }
+    }
+
+private:
+    struct SeparableVaryingInfo {
+        GrSLType      fType;
+        GrGLShaderVar fVariable;
+        GrGLint       fLocation;
+    };
+
+
+    typedef SkSTArray<8, SeparableVaryingInfo, true> SeparableVaryingInfoArray;
+
+    SeparableVaryingInfoArray fSeparableVaryingInfos;
+
+    typedef GrGLPathProcessor INHERITED;
+};
+
 GrPathProcessor::GrPathProcessor(GrColor color,
                                  const SkMatrix& viewMatrix,
                                  const SkMatrix& localMatrix)
     : INHERITED(viewMatrix, localMatrix)
     , fColor(color) {
     this->initClassID<GrPathProcessor>();
 }
 
 void GrPathProcessor::getInvariantOutputColor(GrInitInvariantOutput* out) const {
     out->setKnownFourComponents(fColor);
@@ skipping 38 matching lines @@
            CanCombineOutput(mine.fInputCoverageType, 0xff,
                             theirs.fInputCoverageType, 0xff);
 }
 
 void GrPathProcessor::getGLProcessorKey(const GrBatchTracker& bt,
                                         const GrGLCaps& caps,
                                         GrProcessorKeyBuilder* b) const {
     GrGLPathProcessor::GenKey(*this, bt, caps, b);
 }
 
-GrGLGeometryProcessor* GrPathProcessor::createGLInstance(const GrBatchTracker& bt) const {
-    return SkNEW_ARGS(GrGLPathProcessor, (*this, bt));
+GrGLPrimitiveProcessor* GrPathProcessor::createGLInstance(const GrBatchTracker& bt,
+                                                          const GrGLCaps& caps) const {
+    SkASSERT(caps.nvprSupport() != GrGLCaps::kNone_NvprSupport);
+    if (caps.nvprSupport() == GrGLCaps::kLegacy_NvprSupport) {
+        return SkNEW_ARGS(GrGLLegacyPathProcessor, (*this, bt,
+                                                    caps.maxFixedFunctionTextureCoords()));
+    } else {
+        return SkNEW_ARGS(GrGLNormalPathProcessor, (*this, bt));
+    }
 }
+