gm/shadowmaps.cpp

   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
   9 #include "gm.h"
  10 #include "sk_tool_utils.h"
  11 #include "SkPathEffect.h"
  12 #include "SkPictureRecorder.h"
  13 #include "SkShadowPaintFilterCanvas.h"
  14 #include "SkShadowShader.h"
  15 #include "SkSurface.h"
  16
  17 #ifdef SK_EXPERIMENTAL_SHADOWING
  18
  19
  20 static sk_sp<SkPicture> make_test_picture(int width, int height) {
  21     SkPictureRecorder recorder;
  22
  23     // LONG RANGE TODO: eventually add SkBBHFactory (bounding box factory)
  24     SkCanvas* canvas = recorder.beginRecording(SkRect::MakeIWH(width, height));
  25
  26     SkASSERT(canvas->getTotalMatrix().isIdentity());
  27     SkPaint paint;
  28     paint.setColor(SK_ColorGRAY);
  29
  30     // LONG RANGE TODO: tag occluders
  31     // LONG RANGE TODO: track number of IDs we need (hopefully less than 256)
  32     //                  and determinate the mapping from z to id
  33
  34     // universal receiver, "ground"
  35     canvas->drawRect(SkRect::MakeIWH(width, height), paint);
  36
  37     // TODO: Maybe add the ID here along with the depth
  38
  39     paint.setColor(0xFFEE8888);
  40
  41     canvas->translateZ(80);
  42     canvas->drawRect(SkRect::MakeLTRB(200,150,350,300), paint);
  43
  44     paint.setColor(0xFF88EE88);
  45
  46     canvas->translateZ(80);
  47     canvas->drawRect(SkRect::MakeLTRB(150,200,300,350), paint);
  48
  49     paint.setColor(0xFF8888EE);
  50
  51     canvas->translateZ(80);
  52     canvas->drawRect(SkRect::MakeLTRB(100,100,250,250), paint);
  53     // TODO: Add an assert that Z order matches painter's order
  54     // TODO: think about if the Z-order always matching painting order is too strict
  55
  56     return recorder.finishRecordingAsPicture();
  57 }
  58
  59 namespace skiagm {
  60
  61 class ShadowMapsGM : public GM {
  62 public:
  63     ShadowMapsGM() {
  64         this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
  65     }
  66
  67     void onOnceBeforeDraw() override {
  68         // Create a light set consisting of
  69         //   - bluish directional light pointing more right than down
  70         //   - reddish directional light pointing more down than right
  71         //   - soft white ambient light
  72
  73         SkLights::Builder builder;
  74         builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(0.2f, 0.3f, 0.4f),
  75                                                      SkVector3::Make(0.2f, 0.1f, 1.0f)));
  76         builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(0.4f, 0.3f, 0.2f),
  77                                                      SkVector3::Make(0.1f, 0.2f, 1.0f)));
  78         builder.setAmbientLightColor(SkColor3f::Make(0.4f, 0.4f, 0.4f));
  79         fLights = builder.finish();
  80
  81         fShadowParams.fShadowRadius = 4.0f;
  82         fShadowParams.fBiasingConstant = 0.3f;
  83         fShadowParams.fMinVariance = 1024;
  84         fShadowParams.fType = SkShadowParams::kVariance_ShadowType;
  85     }
  86
  87 protected:
  88     static constexpr int kWidth = 400;
  89     static constexpr int kHeight = 400;
  90
  91     SkString onShortName() override {
  92         return SkString("shadowmaps");
  93     }
  94
  95     SkISize onISize() override {
  96         return SkISize::Make(kWidth, kHeight);
  97     }
  98
  99     void onDraw(SkCanvas* canvas) override {
 100         // This picture stores the picture of the scene.
 101         // It's used to generate the depth maps.
 102         sk_sp<SkPicture> pic(make_test_picture(kWidth, kHeight));
 103         canvas->setLights(fLights);
 104         canvas->drawShadowedPicture(pic, nullptr, nullptr, fShadowParams);
 105     }
 106
 107 private:
 108     sk_sp<SkLights> fLights;
 109     SkShadowParams fShadowParams;
 110     typedef GM INHERITED;
 111 };
 112
 113 //////////////////////////////////////////////////////////////////////////////
 114
 115 DEF_GM(return new ShadowMapsGM;)
 116 }
 117
 118 #endif