1 /*
2 * Copyright 2016 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 "SkNormalFlatSource.h"
9
10 #include "SkArenaAlloc.h"
11 #include "SkNormalSource.h"
12 #include "SkPoint3.h"
13 #include "SkReadBuffer.h"
14 #include "SkWriteBuffer.h"
15
16 #if SK_SUPPORT_GPU
17 #include "glsl/GrGLSLFragmentProcessor.h"
18 #include "glsl/GrGLSLFragmentShaderBuilder.h"
19
20 class NormalFlatFP : public GrFragmentProcessor {
21 public:
Make()22 static std::unique_ptr<GrFragmentProcessor> Make() {
23 return std::unique_ptr<GrFragmentProcessor>(new NormalFlatFP());
24 }
25
name() const26 const char* name() const override { return "NormalFlatFP"; }
27
clone() const28 std::unique_ptr<GrFragmentProcessor> clone() const override { return Make(); }
29
30 private:
31 class GLSLNormalFlatFP : public GrGLSLFragmentProcessor {
32 public:
GLSLNormalFlatFP()33 GLSLNormalFlatFP() {}
34
emitCode(EmitArgs & args)35 void emitCode(EmitArgs& args) override {
36 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
37
38 fragBuilder->codeAppendf("%s = half4(0, 0, 1, 0);", args.fOutputColor);
39 }
40
41 private:
onSetData(const GrGLSLProgramDataManager &,const GrFragmentProcessor &)42 void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override {}
43 };
44
NormalFlatFP()45 NormalFlatFP()
46 : INHERITED(kFlatNormalsFP_ClassID, kConstantOutputForConstantInput_OptimizationFlag) {
47 }
48
onGetGLSLProcessorKey(const GrShaderCaps & caps,GrProcessorKeyBuilder * b) const49 void onGetGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override {}
50
constantOutputForConstantInput(const SkPMColor4f &) const51 SkPMColor4f constantOutputForConstantInput(const SkPMColor4f&) const override {
52 return { 0, 0, 1, 0 };
53 }
onCreateGLSLInstance() const54 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override { return new GLSLNormalFlatFP; }
55
onIsEqual(const GrFragmentProcessor &) const56 bool onIsEqual(const GrFragmentProcessor&) const override { return true; }
57
58 typedef GrFragmentProcessor INHERITED;
59 };
60
asFragmentProcessor(const GrFPArgs &) const61 std::unique_ptr<GrFragmentProcessor> SkNormalFlatSourceImpl::asFragmentProcessor(
62 const GrFPArgs&) const {
63 return NormalFlatFP::Make();
64 }
65
66 #endif // SK_SUPPORT_GPU
67
68 ////////////////////////////////////////////////////////////////////////////
69
Provider()70 SkNormalFlatSourceImpl::Provider::Provider() {}
71
~Provider()72 SkNormalFlatSourceImpl::Provider::~Provider() {}
73
asProvider(const SkShaderBase::ContextRec & rec,SkArenaAlloc * alloc) const74 SkNormalSource::Provider* SkNormalFlatSourceImpl::asProvider(const SkShaderBase::ContextRec &rec,
75 SkArenaAlloc *alloc) const {
76 return alloc->make<Provider>();
77 }
78
fillScanLine(int x,int y,SkPoint3 output[],int count) const79 void SkNormalFlatSourceImpl::Provider::fillScanLine(int x, int y, SkPoint3 output[],
80 int count) const {
81 for (int i = 0; i < count; i++) {
82 output[i] = {0.0f, 0.0f, 1.0f};
83 }
84 }
85
86 ////////////////////////////////////////////////////////////////////////////////
87
CreateProc(SkReadBuffer & buf)88 sk_sp<SkFlattenable> SkNormalFlatSourceImpl::CreateProc(SkReadBuffer& buf) {
89 return sk_make_sp<SkNormalFlatSourceImpl>();
90 }
91
flatten(SkWriteBuffer & buf) const92 void SkNormalFlatSourceImpl::flatten(SkWriteBuffer& buf) const {
93 this->INHERITED::flatten(buf);
94 }
95
96 ////////////////////////////////////////////////////////////////////////////
97
MakeFlat()98 sk_sp<SkNormalSource> SkNormalSource::MakeFlat() {
99 return sk_make_sp<SkNormalFlatSourceImpl>();
100 }
101