Enhances audio effects.Adds TitleScene.

GlyphsJuke.vcxproj

@@ -155,6 +155,7 @@
     <ClCompile Include="src\PlayScene.cc" />
     <ClCompile Include="src\ResultScene.cc" />
     <ClCompile Include="src\Texture.cc" />
+    <ClCompile Include="src\TitleScene.cc" />
     <ClCompile Include="src\Win32Console.cc" />
   </ItemGroup>
   <ItemGroup>
@@ -183,6 +184,7 @@
     <ClInclude Include="src\OffsetClock.h" />
     <ClInclude Include="src\Period.h" />
     <ClInclude Include="src\PlayScene.h" />
+    <ClInclude Include="src\GlitchPosteffect.h" />
     <ClInclude Include="src\Rasterbuffer.h" />
     <ClInclude Include="src\iConsole.h" />
     <ClInclude Include="src\iAllocator.h" />
@@ -197,6 +199,7 @@
     <ClInclude Include="src\Texture.h" />
     <ClInclude Include="src\TextureElement.h" />
     <ClInclude Include="src\TickingClock.h" />
+    <ClInclude Include="src\TitleScene.h" />
     <ClInclude Include="thirdparty\lauxlib.h" />
     <ClInclude Include="thirdparty\linalg.h" />
     <ClInclude Include="thirdparty\lua.h" />
@@ -204,6 +207,7 @@
     <ClInclude Include="thirdparty\luaconf.h" />
     <ClInclude Include="thirdparty\lualib.h" />
     <ClInclude Include="thirdparty\miniaudio.h" />
+    <ClInclude Include="thirdparty\picojson.h" />
     <ClInclude Include="thirdparty\stb_truetype.h" />
     <ClInclude Include="src\Win32Console.h" />
     <ClInclude Include="thirdparty\utf8.h" />

GlyphsJuke.vcxproj.filters

@@ -48,6 +48,9 @@
     <ClCompile Include="src\AudioDevice.cc">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="src\TitleScene.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="src\iConsole.h">
@@ -197,6 +200,15 @@
     <ClInclude Include="src\MusicElementFactory.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="src\TitleScene.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="thirdparty\picojson.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="src\GlitchPosteffect.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Library Include="thirdparty\lua5.1.lib" />

src/AudioDevice.cc

@@ -29,7 +29,7 @@ gj::AudioDevice::~AudioDevice() {
   }
 }
 
-void gj::AudioDevice::PlayMusic(const std::string& path) {
+void gj::AudioDevice::PlayMusic(const std::string& path, double offset) {
   std::lock_guard _(mtx_);
 
   if (playing_) {
@@ -39,6 +39,11 @@ void gj::AudioDevice::PlayMusic(const std::string& path) {
   if (ma_decoder_init_file(path.c_str(), &config, &dec_) != MA_SUCCESS) {
     Abort("AudioDevice decoder error: "+path);
   }
+
+  const uint64_t offset_frame = static_cast<uint64_t>(kSampleRate * offset);
+  if (ma_decoder_seek_to_pcm_frame(&dec_, offset_frame) != MA_SUCCESS) {
+    Abort("decoder seek failure");
+  }
   playing_ = true;
 }
 
@@ -54,6 +59,9 @@ void gj::AudioDevice::Callback_(ma_device* ma, void* out, const void* in, ma_uin
   AudioDevice* dev = reinterpret_cast<AudioDevice*>(ma->pUserData);
   std::lock_guard _(dev->mtx_);
 
+  const double amp = dev->amp_.load();
+  const double lpf = dev->lpf_coe_.load();
+
   float* dst = reinterpret_cast<float*>(out);
 
   size_t wrote = 0;
@@ -65,5 +73,11 @@ void gj::AudioDevice::Callback_(ma_device* ma, void* out, const void* in, ma_uin
     }
     wrote += n;
   }
+
+  for (size_t i = 0; i < static_cast<size_t>(framecnt)*kChannel; ++i) {
+    dst[i] = static_cast<float>(dst[i]*amp);
+    dst[i] = static_cast<float>(dev->lpf_prev_*lpf + dst[i]*(1-lpf));
+    dev->lpf_prev_ = dst[i];
+  }
   dev->time_.fetch_add(framecnt);
 }

src/AudioDevice.h

@@ -32,9 +32,16 @@ class AudioDevice : public iAudioDevice, public iClock {
   AudioDevice();
   ~AudioDevice();
 
-  void PlayMusic(const std::string& path) override;
+  void PlayMusic(const std::string& path, double offset) override;
   void StopMusic() override;
 
+  void SetVolume(double amp) override {
+    amp_.store(amp);
+  }
+  void SetLpfIntensity(double v) override {
+    lpf_coe_.store(v);
+  }
+
   uint64_t now() const override {
     return time_.load() * 1000 / kSampleRate;
   }
@@ -47,6 +54,11 @@ class AudioDevice : public iAudioDevice, public iClock {
   bool playing_ = false;
   ma_decoder dec_{0};
 
+  std::atomic<double> amp_ = 1;
+
+  std::atomic<double> lpf_coe_  = 0;
+  float               lpf_prev_ = 0;
+
   std::atomic<uint64_t> time_;
 
   static void Callback_(ma_device* ma, void* out, const void* in, ma_uint32 framecnt);

src/Font.h

@@ -14,7 +14,7 @@
 namespace gj {
 
 
- class Font {
+class Font {
  public:
   Font() = delete;
   Font(Font&&) = delete;

src/Game.cc

@@ -1,5 +1,7 @@
 #include "Game.h"
-#include "PlayScene.h"
+
+#include "iScene.h"
+#include "TitleScene.h"
 
 
 gj::Game::Game(gj::Game::Param&& p) :
@@ -8,10 +10,9 @@ gj::Game::Game(gj::Game::Param&& p) :
     logger_(p.h),
     w_(p.w), h_(p.h),
     frame_(p.w, p.h, kReserveDrawable, kReserveWritable) {
-  gj::PlayScene::Param param;
+  gj::iScene::Param param;
   param.alloc = alloc_;
   param.clock = &clock_;
   param.audio = p.audio;
-  param.score = "test";  /* TODO test */
-  scene_ = alloc_->MakeUniq<gj::iScene, gj::PlayScene>(std::move(param));
+  scene_ = alloc_->MakeUniq<gj::iScene, gj::TitleScene>(param);
 }

src/GlitchPosteffect.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <cstring>
+#include <cmath>
+
+#include "iDrawable.h"
+
+
+namespace gj {
+
+
+class GlitchPosteffect : public iDrawable {
+ public:
+  GlitchPosteffect(GlitchPosteffect&&) = delete;
+  GlitchPosteffect(const GlitchPosteffect&) = delete;
+
+  GlitchPosteffect& operator=(GlitchPosteffect&&) = delete;
+  GlitchPosteffect& operator=(const GlitchPosteffect&) = delete;
+  
+  GlitchPosteffect() {
+  }
+
+  void Draw(Colorbuffer& fb) const override {
+    const int32_t w = static_cast<int32_t>(fb.width());
+    const int32_t h = static_cast<int32_t>(fb.height());
+
+    float* ptr = fb.ptr();
+
+    for (int32_t y = 0; y < h; ++y) {
+      const double shift = (XorShift(seed+y)%100/100.*2-1)*maxShift;
+      const int32_t s = static_cast<int32_t>(w*shift);
+      if (std::abs(shift) > 1) continue;
+      
+      const size_t offset = static_cast<size_t>(y) * w;
+      float* src = ptr + offset;
+      float* dst = ptr + offset + s;
+      if (src > dst) std::swap(src, dst);
+
+      std::memmove(dst, src, static_cast<size_t>(w) - std::abs(s));
+    }
+  }
+
+  uint64_t seed     = 1;
+  double   maxShift = 0;
+};
+
+
+}

src/GlyphElementFactory.h

@@ -42,7 +42,7 @@ class GlyphElementFactory : public iElementFactory {
     if (found != fonts_.end()) {
       return *found->second;
     }
-    auto f   = alloc_->MakeUniq<Font>(alloc_, "res/font/"+name);
+    auto f   = alloc_->MakeUniq<Font>(alloc_, name);
     auto ptr = f.get();
     fonts_[name] = std::move(f);
     return *ptr;

src/HiraganaMatcher.cc

@@ -189,10 +189,9 @@ bool gj::HiraganaMatcher::Input_(wchar_t c, bool force_cut) {
         if (itr.size() == newbuf.size()) {
           comp_match = i;
           if (force_cut) {
-            buffer_ = {c};
+            buffer_ = L"";
             state_.match += i;
-            UpdateExpects_();
-            return true;
+            return Input_(c, false);
           }
         } else {
           part_match = i;
@@ -248,6 +247,8 @@ void gj::HiraganaMatcher::UpdateExpects_() {
       }
       remain = remain.substr(len);
     }
-    if (prev == remain.size()) Abort("invalid pattern for InputWin");
+    if (prev == remain.size()) {
+      Abort("invalid pattern for InputWin");
+    }
   }
 }

src/Lua.cc

@@ -1,5 +1,7 @@
 #include "Lua.h"
 
+#include "thirdparty/lualib.h"
+
 
 struct LuaPusher {
   LuaPusher() = delete;
@@ -142,6 +144,7 @@ gj::Lua::Lua(iAllocator* alloc, ElementStore* store, const FactoryMap& factory,
   if (L == nullptr) {
     Abort("lua_newstate failure");
   }
+  luaopen_math(L);
 
   for (const auto& f : factory) {
     lua_pushstring(L, f.first.c_str());

src/MusicElement.h

@@ -12,6 +12,17 @@ namespace gj {
 
 class MusicElement : public iElement {
 public:
+  struct Param {
+    iAudioDevice* audio;
+
+    Period period;
+
+    std::string path;
+    double      offset;
+
+    UniqPtr<iElementDriver> driver;
+  };
+
   MusicElement() = delete;
   MusicElement(MusicElement&&) = delete;
   MusicElement(const MusicElement&) = delete;
@@ -19,13 +30,24 @@ public:
   MusicElement& operator=(MusicElement&&) = delete;
   MusicElement& operator=(const MusicElement&) = delete;
 
-  MusicElement(const Period& p, iAudioDevice* audio, const std::string& name) :
-      iElement(p), audio_(audio), path_("res/music/"+name) {
+  MusicElement(Param&& p) :
+      iElement(p.period), audio_(p.audio), path_(p.path), offset_(p.offset),
+      drv_(std::move(p.driver)) {
+    param_["volume"] = 0.;
+    param_["lpf"]    = 0.;
   }
 
   void Update(Frame& frame, double t) override {
+    drv_->Update(param_, t);
+
+    const double volume = std::get<double>(param_["volume"]);
+    const double lpf    = std::get<double>(param_["lpf"]);
+
+    audio_->SetVolume(volume);
+    audio_->SetLpfIntensity(lpf);
+
     if (first_) {
-      audio_->PlayMusic(path_);
+      audio_->PlayMusic(path_, offset_);
       first_ = false;
     }
   }
@@ -41,6 +63,11 @@ public:
   std::string   path_;
 
   bool first_ = true;
+
+  double offset_;
+
+  UniqPtr<iElementDriver> drv_;
+  iElementDriver::Param   param_;
 };
 
 

src/MusicElementFactory.h

@@ -22,11 +22,18 @@ class MusicElementFactory : public iElementFactory {
   }
 
   UniqPtr<iElement> Create(Param&& param) override {
-    if (param.custom.size() != 1) return nullptr;
+    if (param.custom.size() != 2) return nullptr;
 
-    const std::string name = std::get<std::string>(param.custom[0]);
+    const std::string path   = std::get<std::string>(param.custom[0]);
+    const double      offset = std::get<double>(param.custom[1]);
 
-    return alloc_->MakeUniq<iElement, MusicElement>(param.period, audio_, name);
+    MusicElement::Param p;
+    p.audio  = audio_;
+    p.period = param.period;
+    p.path   = path;
+    p.offset = offset;
+    p.driver = std::move(param.driver);
+    return alloc_->MakeUniq<iElement, MusicElement>(std::move(p));
   }
 
  private:

src/PlayScene.cc

@@ -7,29 +7,28 @@
 #include "ResultScene.h"
 
 
-gj::PlayScene::PlayScene(Param&& p) :
-    alloc_(p.alloc), audio_(p.audio),
-    clock_(p.clock), store_(&clock_, 256) {
+gj::PlayScene::PlayScene(const Param& p, const std::string& title, const std::string& path) :
+    param_(p), clock_(p.clock), store_(&clock_, 256) {
 
-  GlyphElementFactory       glyph(alloc_);
-  InputWindowElementFactory inputWin(alloc_, &sb_);
-  MusicElementFactory       music(alloc_, audio_);
+  GlyphElementFactory       glyph(p.alloc);
+  InputWindowElementFactory inputWin(p.alloc, &sb_);
+  MusicElementFactory       music(p.alloc, p.audio);
 
-  sb_.title = ConvertStrToWstr(p.score);
+  sb_.title = ConvertStrToWstr(title);
 
   Lua::FactoryMap map = {
     { "Glyph",    &glyph },
     { "InputWin", &inputWin },
     { "Music",    &music },
   };
-  lua_ = alloc_->MakeUniq<Lua>(
-    alloc_, &store_, map, "res/score/" + p.score + ".lua");
+  lua_ = p.alloc->MakeUniq<Lua>(
+    p.alloc, &store_, map, path);
 }
 
 
 gj::UniqPtr<gj::iScene> gj::PlayScene::Update(Frame& f) {
   if (store_.IsEmpty()) {
-    return alloc_->MakeUniq<iScene, ResultScene>(alloc_, clock_.parent(), sb_);
+    return param_.alloc->MakeUniq<iScene, ResultScene>(param_, sb_);
   }
 
   store_.Update(f);

src/PlayScene.h

@@ -2,10 +2,6 @@
 
 
 #include "ElementStore.h"
-#include "Frame.h"
-#include "iAllocator.h"
-#include "iAudioDevice.h"
-#include "iLogger.h"
 #include "iScene.h"
 #include "Lua.h"
 #include "OffsetClock.h"
@@ -17,14 +13,6 @@ namespace gj {
 
 class PlayScene : public iScene {
  public:
-  struct Param {
-    iAllocator*   alloc;
-    iAudioDevice* audio;
-    const iClock* clock;
-
-    std::string score;
-  };
-
   PlayScene() = delete;
   PlayScene(PlayScene&&) = delete;
   PlayScene(const PlayScene&) = delete;
@@ -32,13 +20,12 @@ class PlayScene : public iScene {
   PlayScene& operator=(PlayScene&&) = delete;
   PlayScene& operator=(const PlayScene&) = delete;
 
-  PlayScene(Param&& p);
+  PlayScene(const Param& p, const std::string& title, const std::string& path);
 
   UniqPtr<iScene> Update(Frame& f) override;
 
  private:
-  iAllocator*   alloc_;
-  iAudioDevice* audio_;
+  Param param_;
 
   OffsetClock clock_;
 

src/ResultScene.cc

@@ -1,8 +1,10 @@
 #include "ResultScene.h"
 
+#include "TitleScene.h"
 
-gj::ResultScene::ResultScene(iAllocator* alloc, const iClock* clock, const Scoreboard& sb) :
-      alloc_(alloc), clock_(clock), sb_(sb),
+
+gj::ResultScene::ResultScene(const Param& p, const Scoreboard& sb) :
+      param_(p), clock_(p.clock), sb_(sb),
       title_(sb.title),
       correct_label_(L"CORRECT TYPES"),
       correct_num_(std::to_wstring(sb.correct)),
@@ -10,7 +12,7 @@ gj::ResultScene::ResultScene(iAllocator* alloc, const iClock* clock, const Score
       line_label_(L"COMPLETE LINES"),
       line_num_(std::to_wstring(sb.completeLines)),
       line_den_(std::to_wstring(sb.lines)),
-      guide_(L"~ PRESS ENTER ~") {
+      guide_(L"~ PRESS SPACE ~") {
 }
 
 gj::UniqPtr<gj::iScene> gj::ResultScene::Update(Frame& f) {
@@ -51,5 +53,9 @@ gj::UniqPtr<gj::iScene> gj::ResultScene::Update(Frame& f) {
   guide_.SetPosition((w-guide_.width())/2, static_cast<int32_t>(h*.8));
   f.Add(&guide_);
 
+  if (f.input.find(' ') != std::string::npos) {
+    return param_.alloc->MakeUniq<iScene, TitleScene>(param_);
+  }
+
   return nullptr;
 }

src/ResultScene.h

@@ -1,8 +1,5 @@
 #pragma once
 
-#include "ElementStore.h"
-#include "Frame.h"
-#include "iAllocator.h"
 #include "iScene.h"
 #include "OffsetClock.h"
 #include "Scoreboard.h"
@@ -21,12 +18,13 @@ class ResultScene : public iScene {
   ResultScene& operator=(ResultScene&&) = delete;
   ResultScene& operator=(const ResultScene&) = delete;
 
-  ResultScene(iAllocator* alloc, const iClock* clock, const Scoreboard& sb);
+  ResultScene(const Param& p, const Scoreboard& sb);
 
   UniqPtr<iScene> Update(Frame& f) override;
 
  private:
-  iAllocator* alloc_;
+  Param param_;
+
   OffsetClock clock_;
   Scoreboard  sb_;
 

src/Texture.cc

@@ -81,7 +81,7 @@ void gj::Texture::Draw(Colorbuffer& fb) const {
       if (dstx < 0 || w <= dstx) continue;
       if (dsty < 0 || h <= dsty) continue;
 
-      dst[dstx + w*dsty] = src[srcx + srcw*srcy] * alpha_;
+      dst[dstx + w*dsty] += src[srcx + srcw*srcy] * alpha_;
     }
   }
 }

src/TitleScene.cc

@@ -0,0 +1,129 @@
+#include "TitleScene.h"
+
+#include <cinttypes>
+#include <fstream>
+#include <iostream>
+#include <sstream>
+#include <string>
+
+#include "thirdparty/picojson.h"
+
+#include "common.h"
+#include "Font.h"
+#include "PlayScene.h"
+
+
+gj::TitleScene::TitleScene(const Param& p) :
+    param_(p),
+    score_(L"penguin: you didn't see anything..."),
+    next_(L"> L"), prev_(L"H <"),
+    guide_(L"H:PREV / SPACE:PLAY / L:NEXT"),
+    logo_(Colorbuffer(p.alloc, 1, 1)) {
+  /* load score list */
+  std::ifstream ifs(kListPath);
+  if (!ifs) Abort(std::string(kListPath)+" is missing");
+
+  ::picojson::value root;
+  const std::string err = ::picojson::parse(root, ifs);
+  ifs.close();
+
+  if (err.size()) Abort(std::string(kListPath)+": "+err);
+
+  std::string line;
+  auto& list = root.get<::picojson::array>();
+  for (auto& e : list) {
+    auto& obj = e.get<::picojson::object>();
+
+    Score s;
+
+    s.displayName = obj["displayName"].get<std::string>();
+    s.music       = obj["music"].get<std::string>();
+    s.score       = obj["score"].get<std::string>();
+    s.playOffset  = static_cast<uint64_t>(obj["playOffset"].get<double>());
+
+    list_.push_back(s);
+  }
+  if (list_.size() == 0) Abort("no score is registered");
+
+  SelectScore_(0);
+
+  /* render logo */
+  Font font(param_.alloc, "res/font/shippori.ttf");
+  logo_ = Texture(font.RenderGlyphs(L"GlyphsJuke", 64));
+}
+
+gj::UniqPtr<gj::iScene> gj::TitleScene::Update(Frame& frame) {
+  for (const auto c : frame.input) {
+    switch (c) {
+    case 'h':
+      SelectScore_(select_index_? select_index_-1: list_.size()-1);
+      break;
+    case 'l':
+      SelectScore_((select_index_+1)%list_.size());
+      break;
+    case ' ':
+      return param_.alloc->MakeUniq<iScene, PlayScene>(
+        param_, list_[select_index_].displayName, list_[select_index_].score);
+    }
+  }
+
+  const uint64_t now = param_.clock->now();
+
+  const int32_t w = static_cast<int32_t>(frame.w);
+  const int32_t h = static_cast<int32_t>(frame.h);
+
+  const int32_t selector_y = static_cast<int32_t>(h*.75);
+
+  const uint64_t period1 = XorShift(now/1000+1)%1000 + 500;
+  const uint64_t period2 = XorShift(now/1000+5)%1000 + 500;
+  logo_.SetAlpha(static_cast<float>(XorShift(now/period1+1)%100/100.*.4+.4));
+
+  const double shift_x = (XorShift(now/period1+1)%100/100.*2 - 1)*.05;
+  const double shift_y = (XorShift(now/period2+3)%100/100.*2 - 1)*.05;
+  const double scale_x = (XorShift(now/period1+3)%100/100.*2 - 1)*.1;
+  
+  const double theta = (XorShift(now/period2+13)%100/100.*2 - 1)*.01*kPi*2;
+
+  const double c = cos(theta), s = sin(theta);
+  auto M = mat3{
+    {1+scale_x, 0, 0},
+    {0, .8, 0},
+    {shift_x, shift_y+.4, 1}
+  };
+  auto Mr = mat3{
+    {c, -s, 0},
+    {s, c, 0},
+    {0, 0, 1},
+  };
+  M = ::linalg::mul(Mr, M);
+  logo_.SetMatrix(M);
+  frame.Add(&logo_);
+
+  next_.SetPosition(static_cast<int32_t>(w*.8-next_.width()), selector_y);
+  frame.Add(&next_);
+
+  prev_.SetPosition(static_cast<int32_t>(w*.2), selector_y);
+  frame.Add(&prev_);
+  
+  score_.SetPosition((w-score_.width())/2, selector_y);
+  frame.Add(&score_);
+
+  guide_.SetPosition((w-guide_.width())/2, selector_y+3);
+  frame.Add(&guide_);
+
+  pe_.seed     = XorShift(now/period1+10);
+  pe_.maxShift = (XorShift(now/period1+7)%100/100.*2 - 1)*.1;
+  frame.Add(&pe_);
+
+  return nullptr;
+}
+
+void gj::TitleScene::SelectScore_(size_t index) {
+  const auto& s = list_[index];
+  score_        = Text(ConvertStrToWstr(s.displayName));
+  select_index_ = index;
+  
+  param_.audio->SetVolume(.2);
+  param_.audio->SetLpfIntensity(.99);
+  param_.audio->PlayMusic(s.music, s.playOffset);
+}

src/TitleScene.h

@@ -0,0 +1,53 @@
+#pragma once
+
+#include "common.h"
+#include "GlitchPosteffect.h"
+#include "iScene.h"
+#include "Text.h"
+#include "Texture.h"
+
+namespace gj {
+
+
+class TitleScene : public iScene {
+ public:
+  static constexpr auto kListPath = "res/list.json";
+
+  TitleScene() = delete;
+  TitleScene(TitleScene&&) = delete;
+  TitleScene(const TitleScene&) = delete;
+
+  TitleScene& operator=(TitleScene&&) = delete;
+  TitleScene& operator=(const TitleScene&) = delete;
+
+  TitleScene(const Param& p);
+
+  UniqPtr<iScene> Update(Frame& frame) override;
+
+ private:
+  struct Score {
+    std::string displayName;
+    std::string score;
+    std::string music;
+    double      playOffset;
+  };
+
+  Param param_;
+
+  Text score_;
+  Text next_;
+  Text prev_;
+  Text guide_;
+
+  Texture logo_;
+  
+  size_t select_index_;
+  std::vector<Score> list_;
+
+  GlitchPosteffect pe_;
+
+  void SelectScore_(size_t index);
+};
+
+
+}

src/common.h

@@ -17,6 +17,8 @@ namespace gj {
 using mat3 = ::linalg::mat<double, 3, 3>;
 using vec3 = ::linalg::vec<double, 3>;
 
+constexpr double kPi = 3.14159265358979323846264338327950288;
+
 
 static inline std::wstring ConvertStrToWstr(const std::string& str) {
   std::wstring ret;
@@ -38,6 +40,12 @@ static inline size_t CountWstrBytes(const std::wstring& str) {
   return n;
 }
 
+static inline uint64_t XorShift(uint64_t x) {
+  x = x ^ (x << 13);
+  x = x ^ (x >>  7);
+  return x ^ (x << 17);
+}
+
 
 [[noreturn]]
 static inline void Abort(const std::string& msg) {

src/iAudioDevice.h

@@ -18,8 +18,11 @@ public:
 
   virtual ~iAudioDevice() = default;
 
-  virtual void PlayMusic(const std::string& path) = 0;
+  virtual void PlayMusic(const std::string& path, double offset) = 0;
   virtual void StopMusic() = 0;
+
+  virtual void SetVolume(double amp) = 0;
+  virtual void SetLpfIntensity(double v) = 0;
 };
 
 

src/iScene.h

@@ -4,6 +4,8 @@
 
 #include "Frame.h"
 #include "iAllocator.h"
+#include "iAudioDevice.h"
+#include "iClock.h"
 #include "iDrawable.h"
 #include "iWritable.h"
 
@@ -13,6 +15,12 @@ namespace gj {
 
 class iScene {
  public:
+  struct Param {
+    iAllocator*   alloc;
+    iAudioDevice* audio;
+    const iClock* clock;
+  };
+
   iScene() = default;
   iScene(iScene&&) = default;
   iScene(const iScene&) = default;