Home | History | Annotate | Download | only in samplecode 
      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 "DecodeFile.h"
      9 #include "SampleCode.h"
     10 #include "Resources.h"
     11 #include "SkCanvas.h"
     12 #include "SkLightingShader.h"
     13 #include "SkNormalSource.h"
     14 #include "SkPoint3.h"
     15 
     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 SampleView {
     33 public:
     34     SkBitmap        fDiffuseBitmap;
     35     SkBitmap        fNormalBitmap;
     36     SkScalar        fLightAngle;
     37     SkScalar        fColorFactor;
     38 
     39     LightingView() {
     40         SkString diffusePath = GetResourcePath("brickwork-texture.jpg");
     41         decode_file(diffusePath.c_str(), &fDiffuseBitmap);
     42         SkString normalPath = GetResourcePath("brickwork_normal-map.jpg");
     43         decode_file(normalPath.c_str(), &fNormalBitmap);
     44 
     45         fLightAngle = 0.0f;
     46         fColorFactor = 0.0f;
     47     }
     48 
     49 protected:
     50     // overrides from SkEventSink
     51     bool onQuery(SkEvent* evt) override {
     52         if (SampleCode::TitleQ(*evt)) {
     53             SampleCode::TitleR(evt, "Lighting");
     54             return true;
     55         }
     56         return this->INHERITED::onQuery(evt);
     57     }
     58 
     59     void onDrawContent(SkCanvas* canvas) override {
     60         fLightAngle += 0.015f;
     61         fColorFactor += 0.01f;
     62         if (fColorFactor > 1.0f) {
     63             fColorFactor = 0.0f;
     64         }
     65 
     66         sk_sp<SkLights> lights(create_lights(fLightAngle, fColorFactor));
     67         SkPaint paint;
     68         sk_sp<SkShader> normalMap = SkShader::MakeBitmapShader(fNormalBitmap,
     69             SkShader::kClamp_TileMode, SkShader::kClamp_TileMode, nullptr);
     70         sk_sp<SkNormalSource> normalSource = SkNormalSource::MakeFromNormalMap(
     71                 std::move(normalMap), SkMatrix::I());
     72         sk_sp<SkShader> diffuseShader = SkShader::MakeBitmapShader(fDiffuseBitmap,
     73                 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode, nullptr);
     74         paint.setShader(SkLightingShader::Make(std::move(diffuseShader), std::move(normalSource),
     75                                                std::move(lights)));
     76         paint.setColor(SK_ColorBLACK);
     77 
     78         SkRect r = SkRect::MakeWH((SkScalar)fDiffuseBitmap.width(),
     79                                   (SkScalar)fDiffuseBitmap.height());
     80         canvas->drawRect(r, paint);
     81 
     82         // so we're constantly updating
     83         this->inval(nullptr);
     84     }
     85 
     86     SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
     87         this->inval(nullptr);
     88         return this->INHERITED::onFindClickHandler(x, y, modi);
     89     }
     90 
     91 private:
     92     typedef SampleView INHERITED;
     93 };
     94 
     95 //////////////////////////////////////////////////////////////////////////////
     96 
     97 static SkView* MyFactory() { return new LightingView; }
     98 static SkViewRegister reg(MyFactory);
     99