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      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 "Sample.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 Sample {
     33 public:
     34     LightingView() : fLightAngle(0.0f) , fColorFactor(0.0f) {
     35         {
     36             SkBitmap diffuseBitmap;
     37             SkAssertResult(GetResourceAsBitmap("images/brickwork-texture.jpg", &diffuseBitmap));
     38 
     39             fRect = SkRect::MakeIWH(diffuseBitmap.width(), diffuseBitmap.height());
     40 
     41             fDiffuseShader = SkShader::MakeBitmapShader(diffuseBitmap,
     42                                                         SkShader::kClamp_TileMode,
     43                                                         SkShader::kClamp_TileMode,
     44                                                         nullptr);
     45         }
     46 
     47         {
     48             SkBitmap normalBitmap;
     49             SkAssertResult(GetResourceAsBitmap("images/brickwork_normal-map.jpg", &normalBitmap));
     50 
     51             sk_sp<SkShader> normalMap = SkShader::MakeBitmapShader(normalBitmap,
     52                                                                    SkShader::kClamp_TileMode,
     53                                                                    SkShader::kClamp_TileMode,
     54                                                                    nullptr);
     55             fNormalSource = SkNormalSource::MakeFromNormalMap(std::move(normalMap), SkMatrix::I());
     56         }
     57     }
     58 
     59 protected:
     60     bool onQuery(Sample::Event* evt) override {
     61         if (Sample::TitleQ(*evt)) {
     62             Sample::TitleR(evt, "Lighting");
     63             return true;
     64         }
     65         return this->INHERITED::onQuery(evt);
     66     }
     67 
     68     void onDrawContent(SkCanvas* canvas) override {
     69         sk_sp<SkLights> lights(create_lights(fLightAngle, fColorFactor));
     70 
     71         SkPaint paint;
     72         paint.setShader(SkLightingShader::Make(fDiffuseShader,
     73                                                fNormalSource,
     74                                                std::move(lights)));
     75         paint.setColor(SK_ColorBLACK);
     76 
     77         canvas->drawRect(fRect, paint);
     78     }
     79 
     80     Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
     81         return this->INHERITED::onFindClickHandler(x, y, modi);
     82     }
     83 
     84     bool onAnimate(const SkAnimTimer& timer) override {
     85         fLightAngle += 0.015f;
     86         fColorFactor += 0.01f;
     87         if (fColorFactor > 1.0f) {
     88             fColorFactor = 0.0f;
     89         }
     90 
     91         return true;
     92     }
     93 
     94 private:
     95     SkRect                fRect;
     96     sk_sp<SkShader>       fDiffuseShader;
     97     sk_sp<SkNormalSource> fNormalSource;
     98 
     99     SkScalar              fLightAngle;
    100     SkScalar              fColorFactor;
    101 
    102     typedef Sample INHERITED;
    103 };
    104 
    105 //////////////////////////////////////////////////////////////////////////////
    106 
    107 DEF_SAMPLE( return new LightingView(); )
    108