Added API for Bevel NormalSource.

src/core/SkNormalSource.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-#include "SkError.h"
-#include "SkErrorInternals.h"
-#include "SkLightingShader.h"
-#include "SkMatrix.h"
+#include "SkNormalBevelSource.h"
+#include "SkNormalFlatSource.h"
+#include "SkNormalMapSource.h"
 #include "SkNormalSource.h"
-#include "SkPM4f.h"
-#include "SkReadBuffer.h"
-#include "SkWriteBuffer.h"
 
-// Genretating vtable
+// Generating vtable
 SkNormalSource::~SkNormalSource() {}
 
-///////////////////////////////////////////////////////////////////////////////
-
-class NormalMapSourceImpl : public SkNormalSource {
-public:
-    NormalMapSourceImpl(sk_sp<SkShader> mapShader, const SkMatrix& invCTM)
-        : fMapShader(std::move(mapShader))
-        , fInvCTM(invCTM) {}
-
-#if SK_SUPPORT_GPU
-    sk_sp<GrFragmentProcessor> asFragmentProcessor(const SkShader::AsFPArgs&) const override;
-#endif
-
-    SkNormalSource::Provider* asProvider(const SkShader::ContextRec& rec,
-                                                         void* storage) const override;
-
-    size_t providerSize(const SkShader::ContextRec& rec) const override;
-    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(NormalMapSourceImpl)
-
-protected:
-    void flatten(SkWriteBuffer& buf) const override;
-
-    bool computeNormTotalInverse(const SkShader::ContextRec& rec, SkMatrix* normTotalInverse) const;
-
-private:
-    class Provider : public SkNormalSource::Provider {
-    public:
-        Provider(const NormalMapSourceImpl& source, SkShader::Context* mapContext,
-                 SkPaint* overridePaint);
-
-        virtual ~Provider() override;
-
-        void fillScanLine(int x, int y, SkPoint3 output[], int count) const override;
-
-    private:
-        const NormalMapSourceImpl& fSource;
-        SkShader::Context* fMapContext;
-
-        SkPaint* fOverridePaint;
-
-        typedef SkNormalSource::Provider INHERITED;
-    };
-
-    sk_sp<SkShader> fMapShader;
-    SkMatrix        fInvCTM; // Inverse of the canvas total matrix, used for rotating normals.
-
-    friend class SkNormalSource;
-
-    typedef SkNormalSource INHERITED;
-};
-
-////////////////////////////////////////////////////////////////////////////
-
-#if SK_SUPPORT_GPU
-
-#include "GrCoordTransform.h"
-#include "GrInvariantOutput.h"
-#include "GrTextureParams.h"
-#include "glsl/GrGLSLFragmentProcessor.h"
-#include "glsl/GrGLSLFragmentShaderBuilder.h"
-#include "SkGr.h"
-
-class NormalMapFP : public GrFragmentProcessor {
-public:
-    NormalMapFP(sk_sp<GrFragmentProcessor> mapFP, const SkMatrix& invCTM)
-        : fInvCTM(invCTM) {
-        this->registerChildProcessor(mapFP);
-
-        this->initClassID<NormalMapFP>();
-    }
-
-    class GLSLNormalMapFP : public GrGLSLFragmentProcessor {
-    public:
-        GLSLNormalMapFP()
-            : fColumnMajorInvCTM22{0.0f} {}
-
-        void emitCode(EmitArgs& args) override {
-            GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
-            GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
-
-            // add uniform
-            const char* xformUniName = nullptr;
-            fXformUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kMat22f_GrSLType,
-                                                   kDefault_GrSLPrecision, "Xform", &xformUniName);
-
-            SkString dstNormalColorName("dstNormalColor");
-            this->emitChild(0, nullptr, &dstNormalColorName, args);
-            fragBuilder->codeAppendf("vec3 normal = normalize(%s.rgb - vec3(0.5));",
-                                     dstNormalColorName.c_str());
-
-            // If there's no x & y components, return (0, 0, +/- 1) instead to avoid division by 0
-            fragBuilder->codeAppend( "if (abs(normal.z) > 0.999) {");
-            fragBuilder->codeAppendf("    %s = normalize(vec4(0.0, 0.0, normal.z, 0.0));",
-                    args.fOutputColor);
-            // Else, Normalizing the transformed X and Y, while keeping constant both Z and the
-            // vector's angle in the XY plane. This maintains the "slope" for the surface while
-            // appropriately rotating the normal regardless of any anisotropic scaling that occurs.
-            // Here, we call 'scaling factor' the number that must divide the transformed X and Y so
-            // that the normal's length remains equal to 1.
-            fragBuilder->codeAppend( "} else {");
-            fragBuilder->codeAppendf("    vec2 transformed = %s * normal.xy;",
-                    xformUniName);
-            fragBuilder->codeAppend( "    float scalingFactorSquared = "
-                                                 "( (transformed.x * transformed.x) "
-                                                   "+ (transformed.y * transformed.y) )"
-                                                 "/(1.0 - (normal.z * normal.z));");
-            fragBuilder->codeAppendf("    %s = vec4(transformed*inversesqrt(scalingFactorSquared),"
-                                                   "normal.z, 0.0);",
-                    args.fOutputColor);
-            fragBuilder->codeAppend( "}");
-        }
-
-        static void GenKey(const GrProcessor& proc, const GrGLSLCaps&,
-                           GrProcessorKeyBuilder* b) {
-            b->add32(0x0);
-        }
-
-    protected:
-        void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor& proc) override {
-            const NormalMapFP& normalMapFP = proc.cast<NormalMapFP>();
-
-            const SkMatrix& invCTM = normalMapFP.invCTM();
-            fColumnMajorInvCTM22[0] = invCTM.get(SkMatrix::kMScaleX);
-            fColumnMajorInvCTM22[1] = invCTM.get(SkMatrix::kMSkewY);
-            fColumnMajorInvCTM22[2] = invCTM.get(SkMatrix::kMSkewX);
-            fColumnMajorInvCTM22[3] = invCTM.get(SkMatrix::kMScaleY);
-            pdman.setMatrix2f(fXformUni, fColumnMajorInvCTM22);
-        }
-
-    private:
-        float fColumnMajorInvCTM22[4];
-        GrGLSLProgramDataManager::UniformHandle fXformUni;
-    };
-
-    void onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override {
-        GLSLNormalMapFP::GenKey(*this, caps, b);
-    }
-
-    const char* name() const override { return "NormalMapFP"; }
-
-    void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
-        inout->setToUnknown(GrInvariantOutput::ReadInput::kWillNot_ReadInput);
-    }
-
-    const SkMatrix& invCTM() const { return fInvCTM; }
-
-private:
-    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override { return new GLSLNormalMapFP; }
-
-    bool onIsEqual(const GrFragmentProcessor& proc) const override {
-        const NormalMapFP& normalMapFP = proc.cast<NormalMapFP>();
-        return fInvCTM == normalMapFP.fInvCTM;
-    }
-
-    SkMatrix fInvCTM;
-};
-
-sk_sp<GrFragmentProcessor> NormalMapSourceImpl::asFragmentProcessor(
-        const SkShader::AsFPArgs& args) const {
-    sk_sp<GrFragmentProcessor> mapFP = fMapShader->asFragmentProcessor(args);
-    if (!mapFP) {
-        return nullptr;
-    }
-
-    return sk_make_sp<NormalMapFP>(std::move(mapFP), fInvCTM);
-}
-
-#endif // SK_SUPPORT_GPU
-
-////////////////////////////////////////////////////////////////////////////
-
-NormalMapSourceImpl::Provider::Provider(const NormalMapSourceImpl& source,
-                                        SkShader::Context* mapContext,
-                                        SkPaint* overridePaint)
-    : fSource(source)
-    , fMapContext(mapContext)
-    , fOverridePaint(overridePaint) {}
-
-NormalMapSourceImpl::Provider::~Provider() {
-    fMapContext->~Context();
-    fOverridePaint->~SkPaint();
-}
-
-SkNormalSource::Provider* NormalMapSourceImpl::asProvider(
-        const SkShader::ContextRec &rec, void *storage) const {
-    SkMatrix normTotalInv;
-    if (!this->computeNormTotalInverse(rec, &normTotalInv)) {
-        return nullptr;
-    }
-
-    // Overriding paint's alpha because we need the normal map's RGB channels to be unpremul'd
-    void* paintStorage = (char*)storage + sizeof(Provider);
-    SkPaint* overridePaint = new (paintStorage) SkPaint(*(rec.fPaint));
-    overridePaint->setAlpha(0xFF);
-    SkShader::ContextRec overrideRec(*overridePaint, *(rec.fMatrix), rec.fLocalMatrix,
-                                     rec.fPreferredDstType);
-
-    void* mapContextStorage = (char*) paintStorage + sizeof(SkPaint);
-    SkShader::Context* context = fMapShader->createContext(overrideRec, mapContextStorage);
-    if (!context) {
-        return nullptr;
-    }
-
-    return new (storage) Provider(*this, context, overridePaint);
-}
-
-size_t NormalMapSourceImpl::providerSize(const SkShader::ContextRec& rec) const {
-    return sizeof(Provider) + sizeof(SkPaint) + fMapShader->contextSize(rec);
-}
-
-bool NormalMapSourceImpl::computeNormTotalInverse(const SkShader::ContextRec& rec,
-                                                  SkMatrix* normTotalInverse) const {
-    SkMatrix total;
-    total.setConcat(*rec.fMatrix, fMapShader->getLocalMatrix());
-
-    const SkMatrix* m = &total;
-    if (rec.fLocalMatrix) {
-        total.setConcat(*m, *rec.fLocalMatrix);
-        m = &total;
-    }
-    return m->invert(normTotalInverse);
-}
-
-#define BUFFER_MAX 16
-void NormalMapSourceImpl::Provider::fillScanLine(int x, int y, SkPoint3 output[],
-                                                 int count) const {
-    SkPMColor tmpNormalColors[BUFFER_MAX];
-
-    do {
-        int n = SkTMin(count, BUFFER_MAX);
-
-        fMapContext->shadeSpan(x, y, tmpNormalColors, n);
-
-        for (int i = 0; i < n; i++) {
-            SkPoint3 tempNorm;
-
-            tempNorm.set(SkIntToScalar(SkGetPackedR32(tmpNormalColors[i])) - 127.0f,
-                         SkIntToScalar(SkGetPackedG32(tmpNormalColors[i])) - 127.0f,
-                         SkIntToScalar(SkGetPackedB32(tmpNormalColors[i])) - 127.0f);
-
-            tempNorm.normalize();
-
-
-            if (!SkScalarNearlyEqual(SkScalarAbs(tempNorm.fZ), 1.0f)) {
-                SkVector transformed = fSource.fInvCTM.mapVector(tempNorm.fX, tempNorm.fY);
-
-                // Normalizing the transformed X and Y, while keeping constant both Z and the
-                // vector's angle in the XY plane. This maintains the "slope" for the surface while
-                // appropriately rotating the normal for any anisotropic scaling that occurs.
-                // Here, we call scaling factor the number that must divide the transformed X and Y
-                // so that the normal's length remains equal to 1.
-                SkScalar scalingFactorSquared =
-                        (SkScalarSquare(transformed.fX) + SkScalarSquare(transformed.fY))
-                        / (1.0f - SkScalarSquare(tempNorm.fZ));
-                SkScalar invScalingFactor = SkScalarInvert(SkScalarSqrt(scalingFactorSquared));
-
-                output[i].fX = transformed.fX * invScalingFactor;
-                output[i].fY = transformed.fY * invScalingFactor;
-                output[i].fZ = tempNorm.fZ;
-            } else {
-                output[i] = {0.0f, 0.0f, tempNorm.fZ};
-                output[i].normalize();
-            }
-
-            SkASSERT(SkScalarNearlyEqual(output[i].length(), 1.0f));
-        }
-
-        output += n;
-        x += n;
-        count -= n;
-    } while (count > 0);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-sk_sp<SkFlattenable> NormalMapSourceImpl::CreateProc(SkReadBuffer& buf) {
-
-    sk_sp<SkShader> mapShader = buf.readFlattenable<SkShader>();
-
-    SkMatrix invCTM;
-    buf.readMatrix(&invCTM);
-
-    return sk_make_sp<NormalMapSourceImpl>(std::move(mapShader), invCTM);
-}
-
-void NormalMapSourceImpl::flatten(SkWriteBuffer& buf) const {
-    this->INHERITED::flatten(buf);
-
-    buf.writeFlattenable(fMapShader.get());
-    buf.writeMatrix(fInvCTM);
-}
-
-////////////////////////////////////////////////////////////////////////////
-
-sk_sp<SkNormalSource> SkNormalSource::MakeFromNormalMap(sk_sp<SkShader> map, const SkMatrix& ctm) {
-    SkMatrix invCTM;
-
-    if (!ctm.invert(&invCTM) || !map) {
-        return nullptr;
-    }
-
-    return sk_make_sp<NormalMapSourceImpl>(std::move(map), invCTM);
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-class SK_API NormalFlatSourceImpl : public SkNormalSource {
-public:
-    NormalFlatSourceImpl(){}
-
-#if SK_SUPPORT_GPU
-    sk_sp<GrFragmentProcessor> asFragmentProcessor(const SkShader::AsFPArgs&) const override;
-#endif
-
-    SkNormalSource::Provider* asProvider(const SkShader::ContextRec& rec,
-                                         void* storage) const override;
-    size_t providerSize(const SkShader::ContextRec& rec) const override;
-
-    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(NormalFlatSourceImpl)
-
-protected:
-    void flatten(SkWriteBuffer& buf) const override;
-
-private:
-    class Provider : public SkNormalSource::Provider {
-    public:
-        Provider();
-
-        virtual ~Provider();
-
-        void fillScanLine(int x, int y, SkPoint3 output[], int count) const override;
-
-    private:
-        typedef SkNormalSource::Provider INHERITED;
-    };
-
-    friend class SkNormalSource;
-
-    typedef SkNormalSource INHERITED;
-};
-
-////////////////////////////////////////////////////////////////////////////
-
-#if SK_SUPPORT_GPU
-
-class NormalFlatFP : public GrFragmentProcessor {
-public:
-    NormalFlatFP() {
-        this->initClassID<NormalFlatFP>();
-    }
-
-    class GLSLNormalFlatFP : public GrGLSLFragmentProcessor {
-    public:
-        GLSLNormalFlatFP() {}
-
-        void emitCode(EmitArgs& args) override {
-            GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
-
-            fragBuilder->codeAppendf("%s = vec4(0, 0, 1, 0);", args.fOutputColor);
-        }
-
-        static void GenKey(const GrProcessor& proc, const GrGLSLCaps&,
-                           GrProcessorKeyBuilder* b) {
-            b->add32(0x0);
-        }
-
-    protected:
-        void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor& proc) override {}
-    };
-
-    void onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override {
-        GLSLNormalFlatFP::GenKey(*this, caps, b);
-    }
-
-    const char* name() const override { return "NormalFlatFP"; }
-
-    void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
-        inout->setToUnknown(GrInvariantOutput::ReadInput::kWillNot_ReadInput);
-    }
-
-private:
-    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override { return new GLSLNormalFlatFP; }
-
-    bool onIsEqual(const GrFragmentProcessor& proc) const override {
-        return true;
-    }
-};
-
-sk_sp<GrFragmentProcessor> NormalFlatSourceImpl::asFragmentProcessor(
-        const SkShader::AsFPArgs&) const {
-
-    return sk_make_sp<NormalFlatFP>();
-}
-
-#endif // SK_SUPPORT_GPU
-
-////////////////////////////////////////////////////////////////////////////
-
-NormalFlatSourceImpl::Provider::Provider() {}
-
-NormalFlatSourceImpl::Provider::~Provider() {}
-
-SkNormalSource::Provider* NormalFlatSourceImpl::asProvider(const SkShader::ContextRec &rec,
-                                                           void *storage) const {
-    return new (storage) Provider();
-}
-
-size_t NormalFlatSourceImpl::providerSize(const SkShader::ContextRec&) const {
-    return sizeof(Provider);
-}
-
-void NormalFlatSourceImpl::Provider::fillScanLine(int x, int y, SkPoint3 output[],
-                                                  int count) const {
-    for (int i = 0; i < count; i++) {
-        output[i] = {0.0f, 0.0f, 1.0f};
-    }
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-sk_sp<SkFlattenable> NormalFlatSourceImpl::CreateProc(SkReadBuffer& buf) {
-    return sk_make_sp<NormalFlatSourceImpl>();
-}
-
-void NormalFlatSourceImpl::flatten(SkWriteBuffer& buf) const {
-    this->INHERITED::flatten(buf);
-}
-
-////////////////////////////////////////////////////////////////////////////
-
-sk_sp<SkNormalSource> SkNormalSource::MakeFlat() {
-    return sk_make_sp<NormalFlatSourceImpl>();
-}
-
-////////////////////////////////////////////////////////////////////////////
-
 ////////////////////////////////////////////////////////////////////////////
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkNormalSource)
-    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(NormalMapSourceImpl)
-    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(NormalFlatSourceImpl)
+SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkNormalMapSourceImpl)
+SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkNormalFlatSourceImpl)
+SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkNormalBevelSourceImpl)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
 
 ////////////////////////////////////////////////////////////////////////////