1 /*
2 * Copyright 2015 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 "include/core/SkCanvas.h"
9 #include "include/core/SkPoint3.h"
10 #include "samplecode/DecodeFile.h"
11 #include "samplecode/Sample.h"
12 #include "src/core/SkNormalSource.h"
13 #include "src/shaders/SkLightingShader.h"
14 #include "tools/Resources.h"
15
create_lights(SkScalar angle,SkScalar blue)16 static sk_sp<SkLights> create_lights(SkScalar angle, SkScalar blue) {
17
18 const SkVector3 dir = SkVector3::Make(SkScalarSin(angle)*SkScalarSin(SK_ScalarPI*0.25f),
19 SkScalarCos(angle)*SkScalarSin(SK_ScalarPI*0.25f),
20 SkScalarCos(SK_ScalarPI*0.25f));
21
22 SkLights::Builder builder;
23
24 builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(1.0f, 1.0f, blue), dir));
25 builder.setAmbientLightColor(SkColor3f::Make(0.1f, 0.1f, 0.1f));
26
27 return builder.finish();
28 }
29
30 ////////////////////////////////////////////////////////////////////////////
31
32 class LightingView : public Sample {
33 public:
LightingView()34 LightingView() : fLightAngle(0.0f), fColorFactor(0.0f) {}
35
36 protected:
name()37 SkString name() override { return SkString("Lighting"); }
38
onOnceBeforeDraw()39 void onOnceBeforeDraw() override {
40 {
41 SkBitmap diffuseBitmap;
42 SkAssertResult(GetResourceAsBitmap("images/brickwork-texture.jpg", &diffuseBitmap));
43
44 fRect = SkRect::MakeIWH(diffuseBitmap.width(), diffuseBitmap.height());
45
46 fDiffuseShader = diffuseBitmap.makeShader();
47 }
48
49 {
50 SkBitmap normalBitmap;
51 SkAssertResult(GetResourceAsBitmap("images/brickwork_normal-map.jpg", &normalBitmap));
52
53 sk_sp<SkShader> normalMap = normalBitmap.makeShader();
54 fNormalSource = SkNormalSource::MakeFromNormalMap(std::move(normalMap), SkMatrix::I());
55 }
56 }
57
onDrawContent(SkCanvas * canvas)58 void onDrawContent(SkCanvas* canvas) override {
59 sk_sp<SkLights> lights(create_lights(fLightAngle, fColorFactor));
60
61 SkPaint paint;
62 paint.setShader(SkLightingShader::Make(fDiffuseShader,
63 fNormalSource,
64 std::move(lights)));
65 paint.setColor(SK_ColorBLACK);
66
67 canvas->drawRect(fRect, paint);
68 }
69
onFindClickHandler(SkScalar x,SkScalar y,ModifierKey modi)70 Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey modi) override {
71 return this->INHERITED::onFindClickHandler(x, y, modi);
72 }
73
onAnimate(double nanos)74 bool onAnimate(double nanos) override {
75 fLightAngle += 0.015f;
76 fColorFactor += 0.01f;
77 if (fColorFactor > 1.0f) {
78 fColorFactor = 0.0f;
79 }
80
81 return true;
82 }
83
84 private:
85 SkRect fRect;
86 sk_sp<SkShader> fDiffuseShader;
87 sk_sp<SkNormalSource> fNormalSource;
88
89 SkScalar fLightAngle;
90 SkScalar fColorFactor;
91
92 typedef Sample INHERITED;
93 };
94
95 //////////////////////////////////////////////////////////////////////////////
96
97 DEF_SAMPLE( return new LightingView(); )
98
