1
2/*
3 * Copyright 2015 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8#include "SampleCode.h"
9#include "Resources.h"
10
11#include "SkCanvas.h"
12#include "SkImageDecoder.h"
13#include "SkLightingShader.h"
14#include "SkPoint3.h"
15
16static const SkLightingShader::Lights* 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    SkLightingShader::Lights::Builder builder;
23
24    builder.add(SkLight(SkColor3f::Make(1.0f, 1.0f, blue), dir));
25    builder.add(SkLight(SkColor3f::Make(0.1f, 0.1f, 0.1f)));
26
27    return builder.finish();
28}
29
30////////////////////////////////////////////////////////////////////////////
31
32class LightingView : public SampleView {
33public:
34    SkAutoTUnref<SkShader> fShader;
35    SkBitmap               fDiffuseBitmap;
36    SkBitmap               fNormalBitmap;
37    SkScalar               fLightAngle;
38    SkScalar               fColorFactor;
39
40    LightingView() {
41        SkString diffusePath = GetResourcePath("brickwork-texture.jpg");
42        SkImageDecoder::DecodeFile(diffusePath.c_str(), &fDiffuseBitmap);
43        SkString normalPath = GetResourcePath("brickwork_normal-map.jpg");
44        SkImageDecoder::DecodeFile(normalPath.c_str(), &fNormalBitmap);
45
46        fLightAngle = 0.0f;
47        fColorFactor = 0.0f;
48
49        SkAutoTUnref<const SkLightingShader::Lights> lights(create_lights(fLightAngle, 1.0f));
50
51        fShader.reset(SkLightingShader::Create(fDiffuseBitmap, fNormalBitmap,
52                                               lights, SkVector::Make(1.0f, 0.0f),
53                                               nullptr, nullptr));
54    }
55
56    virtual ~LightingView() {}
57
58protected:
59    // overrides from SkEventSink
60    bool onQuery(SkEvent* evt) override {
61        if (SampleCode::TitleQ(*evt)) {
62            SampleCode::TitleR(evt, "Lighting");
63            return true;
64        }
65        return this->INHERITED::onQuery(evt);
66    }
67
68    void onDrawContent(SkCanvas* canvas) override {
69        fLightAngle += 0.015f;
70        fColorFactor += 0.01f;
71        if (fColorFactor > 1.0f) {
72            fColorFactor = 0.0f;
73        }
74
75        SkAutoTUnref<const SkLightingShader::Lights> lights(create_lights(fLightAngle,
76                                                                          fColorFactor));
77
78        fShader.reset(SkLightingShader::Create(fDiffuseBitmap, fNormalBitmap,
79                                               lights, SkVector::Make(1.0f, 0.0f),
80                                               nullptr, nullptr));
81
82        SkPaint paint;
83        paint.setShader(fShader);
84        paint.setColor(SK_ColorBLACK);
85
86        SkRect r = SkRect::MakeWH((SkScalar)fDiffuseBitmap.width(),
87                                  (SkScalar)fDiffuseBitmap.height());
88        canvas->drawRect(r, paint);
89
90        // so we're constantly updating
91        this->inval(nullptr);
92    }
93
94    SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
95        this->inval(nullptr);
96        return this->INHERITED::onFindClickHandler(x, y, modi);
97    }
98
99private:
100    typedef SampleView INHERITED;
101};
102
103//////////////////////////////////////////////////////////////////////////////
104
105static SkView* MyFactory() { return new LightingView; }
106static SkViewRegister reg(MyFactory);
107