[add] Added Song and Implemented loading a list of songs.

.bin/.gitignore

@@ -1,3 +1,4 @@
 *
 !/.gitignore
 !/fonts
+!/songs

.bin/songs/list.json

@@ -0,0 +1,15 @@
+[
+  {
+    "name": "test-60bpm",
+    "bpm": 60,
+    "music":  "test-60bpm.ogg",
+    "script": "test-60bpm.sj",
+
+    "preview": {
+      "play-offset": 1000,
+      "play-loop": 2000,
+      "bg-inner-color": [0.8, 0.8, 0.8, 1],
+      "bg-outer-color": [0.8, 0.8, 0.8, 1]
+    }
+  }
+]

src/sj/Game.d

@@ -1,11 +1,17 @@
 /// License: MIT
 module sj.Game;
 
+import std.algorithm,
+       std.file,
+       std.json,
+       std.path;
+
 import sj.AbstractGame,
        sj.FontSet,
        sj.LobbyWorld,
        sj.ProgramSet,
        sj.SelectScene,
+       sj.Song,
        sj.TitleScene;
 
 ///
@@ -13,13 +19,19 @@ class Game : AbstractGame {
  public:
   ///
   this() {
+    const path = thisExePath.dirName;
+
+    const songs_dir  = buildPath(path, "songs");
+    const songs_list = buildPath(songs_dir, "list.json").readText;
+    songs_ = Song.CreateFromJson(songs_list.parseJSON, songs_dir);
+
     programs_ = new ProgramSet;
     fonts_    = new FontSet;
 
     lobby_ = new LobbyWorld(programs_);
 
     title_  = new TitleScene(lobby_, programs_);
-    select_ = new SelectScene(lobby_, programs_);
+    select_ = new SelectScene(lobby_, programs_, songs_);
 
     title_.SetupSceneDependency(select_);
     select_.SetupSceneDependency(title_);
@@ -35,9 +47,13 @@ class Game : AbstractGame {
 
     programs_.destroy();
     fonts_.destroy();
+
+    songs_.each!destroy();
   }
 
  private:
+  Song[] songs_;
+
   ProgramSet programs_;
 
   FontSet fonts_;

src/sj/SelectScene.d

@@ -12,6 +12,7 @@ import sj.KeyInput,
        sj.LobbyWorld,
        sj.ProgramSet,
        sj.SceneInterface,
+       sj.Song,
        sj.TitleScene,
        sj.util.Animation,
        sj.util.Easing,
@@ -22,8 +23,9 @@ class SelectScene : SceneInterface {
  public:
 
   ///
-  this(LobbyWorld lobby, ProgramSet program) {
+  this(LobbyWorld lobby, ProgramSet program, Song[] songs) {
     lobby_ = lobby;
+    songs_ = songs.dup;
 
     sound_ = sfSound_create();
     soundres_.Load();
@@ -80,12 +82,12 @@ class SelectScene : SceneInterface {
 
   LobbyWorld lobby_;
 
-  sfSound* sound_;
+  Song[] songs_;
 
+  sfSound*       sound_;
   SoundResources soundres_;
 
   FirstSetupState    first_state_;
-
   AbstractSceneState status_;
 }
 
@@ -145,7 +147,7 @@ private class FirstSetupState : AbstractSceneState {
     owner.lobby_.background.outer_color = bg_outer_ease_.Calculate(ratio);
 
     if (anime_.isFinished) {
-      stage_appear_state_.Initialize();
+      stage_appear_state_.Initialize(0);
       return CreateResult(stage_appear_state_);
     }
     return CreateResult(this);
@@ -170,8 +172,11 @@ private class StageAppearState : AbstractSceneState {
   enum AnimeFrames       = 30;
   enum CubeRotationSpeed = vec3(0, PI/500, 0);
 
-  void Initialize() {  // TODO: pass a stage data
+  void Initialize(size_t song_index) {
+    song_index_ = song_index;
+
     anime_ = Animation(AnimeFrames);
+
     cube_interval_ease_ = Easing!float(owner.lobby_.cube_interval, 0.005);
 
     sfSound_setBuffer(owner.sound_, owner.soundres_.spotlight);
@@ -187,6 +192,8 @@ private class StageAppearState : AbstractSceneState {
   }
 
  private:
+  size_t song_index_;
+
   Animation anime_;
 
   Easing!float cube_interval_ease_;

src/sj/Song.d

@@ -0,0 +1,96 @@
+/// License: MIT
+module sj.Song;
+
+import std.array,
+       std.conv,
+       std.exception,
+       std.json,
+       std.path,
+       std.string,
+       std.typecons;
+
+import derelict.sfml2.audio,
+       derelict.sfml2.system;
+
+import gl4d;
+
+static import sjplayer;
+
+///
+class Song {
+ public:
+  ///
+  static struct PreviewConfig {
+   public:
+    ///
+    size_t play_offset;
+
+    ///
+    Nullable!vec4 bg_inner_color;
+    ///
+    Nullable!vec4 bg_outer_color;
+  }
+
+  ///
+  static Song[] CreateFromJson(in JSONValue json, string basepath) {
+    auto result = appender!(Song[]);
+    result.reserve(json.array.length);
+
+    foreach (item; json.array) {
+      result ~= new Song(item, basepath);
+    }
+    return result[];
+  }
+
+  ///
+  this(in JSONValue json, string basepath) {
+    const music_path = buildPath(basepath, json["music"].str);
+
+    name_        = json["name"].str;
+    bpm_         = GetNumericAsFloatFromJson(json["bpm"]);
+    music_       = sfMusic_createFromFile(music_path.toStringz).enforce;
+    script_path_ = buildPath(basepath, json["script"].str);
+
+    // TODO: update preview config
+  }
+  ~this() {
+    sfMusic_destroy(music_);
+  }
+
+  ///
+  void PlayForGame() {
+    sfMusic_setPlayingOffset(music_, sfMilliseconds(0));
+    sfMusic_play(music_);
+  }
+  ///
+  void PlayForPreview() {
+    sfMusic_setPlayingOffset(
+        music_, sfMilliseconds(preview_.play_offset.to!int));
+    sfMusic_play(music_);
+  }
+
+  ///
+  sjplayer.Context CreatePlayerContext() const {
+    assert(false);  // TODO:
+  }
+
+  ///
+  @property ref const(PreviewConfig) preview() const {
+    return preview_;
+  }
+
+ private:
+  static float GetNumericAsFloatFromJson(in JSONValue json) {
+    return json.type == JSONType.float_? json.floating: json.integer;
+  }
+
+  string name_;
+
+  float bpm_;
+
+  sfMusic* music_;
+
+  string script_path_;
+
+  PreviewConfig preview_;
+}