Added API for Bevel NormalSource.

src/core/SkNormalSource.cpp

Index: src/core/SkNormalSource.cpp
diff --git a/src/core/SkNormalSource.cpp b/src/core/SkNormalSource.cpp
index 7dc8bc1aea7be24ea6ddfc4583fbdce37988d32b..6055f83f8b639bdbfdb74e2f8eebef3261e32a1c 100644
--- a/src/core/SkNormalSource.cpp
+++ b/src/core/SkNormalSource.cpp
@@ -472,6 +472,182 @@ sk_sp<SkNormalSource> SkNormalSource::MakeFlat() {
 
 ////////////////////////////////////////////////////////////////////////////
 
+class SK_API NormalBevelSourceImpl : public SkNormalSource {
+public:
+    NormalBevelSourceImpl(BevelType type, SkScalar width, SkScalar height)

[robertphillips, 2016/07/13 14:39:02]

These seem over tabbed

[dvonbeck, 2016/07/13 16:09:17]

Done.

+            : fType(type)
+            , fWidth(width)
+            , fHeight(height) {}
+
+#if SK_SUPPORT_GPU
+    sk_sp<GrFragmentProcessor> asFragmentProcessor(GrContext*,
+                                                   const SkMatrix& viewM,
+                                                   const SkMatrix* localMatrix,
+                                                   SkFilterQuality,
+                                                   SkSourceGammaTreatment) 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(NormalBevelSourceImpl)
+
+protected:
+    void flatten(SkWriteBuffer& buf) const override;
+
+private:
+    class Provider : public SkNormalSource::Provider {
+    public:
+        Provider(const NormalBevelSourceImpl& source);
+
+        virtual ~Provider();
+
+        void fillScanLine(int x, int y, SkPoint3 output[], int count) const override;
+
+    private:
+        const NormalBevelSourceImpl& fSource;
+
+        typedef SkNormalSource::Provider INHERITED;
+    };
+
+    SkNormalSource::BevelType fType;
+    SkScalar fWidth;
+    SkScalar fHeight;
+
+    typedef SkNormalSource INHERITED;
+};
+
+////////////////////////////////////////////////////////////////////////////
+
+#if SK_SUPPORT_GPU
+
+class NormalBevelFP : public GrFragmentProcessor {
+public:
+    NormalBevelFP(SkNormalSource::BevelType type, SkScalar width, SkScalar height)
+            : fType(type)
+            , fWidth(width)
+            , fHeight(height) {
+        this->initClassID<NormalBevelFP>();
+    }
+
+    class GLSLNormalBevelFP : public GrGLSLFragmentProcessor {
+    public:

[robertphillips, 2016/07/13 14:39:02]

Need to init your member variables to something here.

[dvonbeck, 2016/07/13 16:09:16]

Done. Why?

[robertphillips, 2016/07/13 16:16:55]

Normally, in onSetData you have some code like:

if (fPrevType != normalBevelFP.fType) {
   // upload new bevel type as a uniform
   fPrevType = normalBevelFP.fType;
}

if you don't initialize fPrevType in the constructor then the comparison that
uses it is rather dodgy on the first call to onSetData. For this reason the
GL*FP classes usually initialize their fPrev* member variables to invalid values
for each type.

+        GLSLNormalBevelFP() {}
+
+        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 {
+            const NormalBevelFP& normalBevelFP = proc.cast<NormalBevelFP>();
+
+            fType   = normalBevelFP.fType;
+            fWidth  = normalBevelFP.fWidth;
+            fHeight = normalBevelFP.fHeight;
+        }
+
+    private:

[robertphillips, 2016/07/13 14:39:02]

Usually these would be named fPrevType, fPrevWidth ...

[dvonbeck, 2016/07/13 16:09:17]

Done.

+        SkNormalSource::BevelType fType;
+        SkScalar fWidth;
+        SkScalar fHeight;
+    };
+
+    void onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override {
+        GLSLNormalBevelFP::GenKey(*this, caps, b);
+    }
+
+    const char* name() const override { return "NormalBevelFP"; }
+
+    void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
+        inout->setToUnknown(GrInvariantOutput::ReadInput::kWillNot_ReadInput);
+    }
+
+private:
+    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override { return new GLSLNormalBevelFP; }
+
+    bool onIsEqual(const GrFragmentProcessor& proc) const override {
+        const NormalBevelFP& normalBevelFP = proc.cast<NormalBevelFP>();
+        return fType   == normalBevelFP.fType &&
+               fWidth  == normalBevelFP.fWidth &&
+               fHeight == normalBevelFP.fHeight;
+    }
+
+    SkNormalSource::BevelType fType;
+    SkScalar fWidth;
+    SkScalar fHeight;
+};
+
+sk_sp<GrFragmentProcessor> NormalBevelSourceImpl::asFragmentProcessor(
+        GrContext *context,
+        const SkMatrix &viewM,
+        const SkMatrix *localMatrix,
+        SkFilterQuality filterQuality,
+        SkSourceGammaTreatment gammaTreatment) const {
+
+    return sk_make_sp<NormalBevelFP>(fType, fWidth, fHeight);
+}
+
+#endif // SK_SUPPORT_GPU
+
+////////////////////////////////////////////////////////////////////////////
+
+NormalBevelSourceImpl::Provider::Provider(const NormalBevelSourceImpl& source)

[robertphillips, 2016/07/13 14:39:02]

Over tabbed

[dvonbeck, 2016/07/13 16:09:16]

Done.

+        : fSource(source) {}
+
+NormalBevelSourceImpl::Provider::~Provider() {}
+
+SkNormalSource::Provider* NormalBevelSourceImpl::asProvider(const SkShader::ContextRec &rec,
+                                                            void *storage) const {
+    return new (storage) Provider(*this);
+}
+
+size_t NormalBevelSourceImpl::providerSize(const SkShader::ContextRec&) const {
+    return sizeof(Provider);
+}
+
+void NormalBevelSourceImpl::Provider::fillScanLine(int x, int y, SkPoint3 output[],
+                                                   int count) const {

[robertphillips, 2016/07/13 14:39:02]

I think we're leaning to always having auto as the loop variable

[dvonbeck, 2016/07/13 16:09:16]

I don't feel like it's appropriate here, being an int and not an iterator or
reference to the element.

+    for (int i = 0; i < count; i++) {
+        output[i] = {0, 0, 1.0};
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+sk_sp<SkFlattenable> NormalBevelSourceImpl::CreateProc(SkReadBuffer& buf) {
+
+    auto type = static_cast<SkNormalSource::BevelType>(buf.readInt());
+    SkScalar width = buf.readScalar();
+    SkScalar height = buf.readScalar();
+
+    return sk_make_sp<NormalBevelSourceImpl>(type, width, height);
+}
+
+void NormalBevelSourceImpl::flatten(SkWriteBuffer& buf) const {
+    this->INHERITED::flatten(buf);
+
+    buf.writeInt(static_cast<int>(fType));
+    buf.writeScalar(fWidth);
+    buf.writeScalar(fHeight);
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+sk_sp<SkNormalSource> SkNormalSource::MakeBevel(BevelType type, SkScalar width, SkScalar height) {
+    return sk_make_sp<NormalBevelSourceImpl>(type, width, height);
+}
+
+////////////////////////////////////////////////////////////////////////////
+
 ////////////////////////////////////////////////////////////////////////////
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkNormalSource)