diff --git a/sjplayer/src/sjplayer/Context.d b/sjplayer/src/sjplayer/Context.d
index 016cd2c..94b3e88 100644
--- a/sjplayer/src/sjplayer/Context.d
+++ b/sjplayer/src/sjplayer/Context.d
@@ -28,10 +28,9 @@ import sjplayer.Actor,
 class Context {
  public:
   ///
-  this(ParametersBlock[] params, vec2i window_size, ProgramSet programs) {
+  this(ParametersBlock[] params, PostEffect posteffect, ProgramSet programs) {
     actor_      = new Actor(programs.Get!ActorProgram);
     background_ = new Background(programs.Get!BackgroundProgram);
-    posteffect_ = new PostEffect(programs.Get!PostEffectProgram, window_size);
 
     auto builder  = new Builder;
     auto varstore = new VarStore(actor_);
@@ -47,7 +46,7 @@ class Context {
         ),
         tuple(
           "posteffect",
-          PostEffectControllerFactory(varstore, posteffect_),
+          PostEffectControllerFactory(varstore, posteffect),
         ),
 
         tuple(
@@ -94,7 +93,6 @@ class Context {
     drawers_.each!destroy;
     elements_.each!destroy;
 
-    posteffect_.destroy();
     background_.destroy();
     actor_.destroy();
   }
@@ -116,10 +114,6 @@ class Context {
     controllers_.each!(x => x.Operate(time));
   }
 
-  ///
-  void StartDrawing() {
-    posteffect_.BindFramebuffer();
-  }
   ///
   void DrawBackground() {
     background_.Draw();
@@ -132,11 +126,6 @@ class Context {
   void DrawActor() {
     actor_.Draw();
   }
-  ///
-  void EndDrawing() {
-    posteffect_.UnbindFramebuffer();
-    posteffect_.DrawFramebuffer();
-  }
 
   ///
   @property inout(ActorControllerInterface) actor() inout {
@@ -170,7 +159,6 @@ class Context {
 
   Actor      actor_;
   Background background_;
-  PostEffect posteffect_;
 
   ElementInterface[]             elements_;
   ElementDrawerInterface[]       drawers_;
diff --git a/sjplayer/src/sjplayer/PostEffect.d b/sjplayer/src/sjplayer/PostEffect.d
index 39038c2..bd2e59f 100644
--- a/sjplayer/src/sjplayer/PostEffect.d
+++ b/sjplayer/src/sjplayer/PostEffect.d
@@ -28,6 +28,7 @@ class PostEffect {
     program_ = program;
     fb_      = Framebuffer.Create();
     tex_     = TextureRect.Create();
+    depth_   = Renderbuffer.Create();
     sampler_ = Sampler.Create();
 
     with (TextureRectAllocator()) {
@@ -38,7 +39,11 @@ class PostEffect {
       data           = null;
       Allocate(tex_);
     }
-
+    with (RenderbufferAllocator()) {
+      format = GL_DEPTH_COMPONENT;
+      size   = sz;
+      Allocate(depth_);
+    }
     with (SamplerConfigurer()) {
       filterMin = GL_NEAREST;
       filterMag = GL_NEAREST;
@@ -48,6 +53,9 @@ class PostEffect {
     fb_.Bind();
     fb_.attachment!(GL_COLOR_ATTACHMENT0, 0, GL_TEXTURE_RECTANGLE) = tex_;
     fb_.attachmentOrder = [GL_COLOR_ATTACHMENT0];
+
+    fb_.attachment!GL_DEPTH_ATTACHMENT = depth_;
+
     fb_.Validate();
     fb_.Unbind();
   }
@@ -78,6 +86,8 @@ class PostEffect {
 
   TextureRectRef tex_;
 
+  RenderbufferRef depth_;
+
   SamplerRef sampler_;
 }
 
diff --git a/sjplayer/src/sjplayer/package.d b/sjplayer/src/sjplayer/package.d
index ae563c8..5f5682c 100644
--- a/sjplayer/src/sjplayer/package.d
+++ b/sjplayer/src/sjplayer/package.d
@@ -9,16 +9,17 @@ public {
   import sjscript : ScriptException;
 
   import sjplayer.Context,
+         sjplayer.PostEffect,
          sjplayer.ProgramSet,
          sjplayer.ScriptRuntimeException;
 }
 
 ///
-Context CreateContextFromText(string src, vec2i window_size, ProgramSet programs) {
-  return src.CreateScriptAst().CreateContextFromScriptAst(window_size, programs);
+Context CreateContextFromText(string src, PostEffect posteffect, ProgramSet programs) {
+  return src.CreateScriptAst().CreateContextFromScriptAst(posteffect, programs);
 }
 ///
 Context CreateContextFromScriptAst(
-    ParametersBlock[] params, vec2i window_size, ProgramSet programs) {
-  return new Context(params, window_size, programs);
+    ParametersBlock[] params, PostEffect posteffect, ProgramSet programs) {
+  return new Context(params, posteffect, programs);
 }
diff --git a/src/main.d b/src/main.d
index b33624b..ccd7ca9 100644
--- a/src/main.d
+++ b/src/main.d
@@ -94,8 +94,6 @@ private auto CreateWindow(ref in Args args) {
   sfWindow_setActive(win, true).enforce;
 
   gl.ApplyContext();
-  gl.Enable(GL_BLEND);
-  gl.BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
   static struct Window {
    public:
diff --git a/src/sj/AbstractGame.d b/src/sj/AbstractGame.d
index 4ae41a3..ec86e92 100644
--- a/src/sj/AbstractGame.d
+++ b/src/sj/AbstractGame.d
@@ -21,7 +21,6 @@ class AbstractGame {
   }
   ///
   void Draw() {
-    gl.Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     scene_.Draw();
   }
 
diff --git a/src/sj/Game.d b/src/sj/Game.d
index ac4fa60..6836b6a 100644
--- a/src/sj/Game.d
+++ b/src/sj/Game.d
@@ -7,6 +7,10 @@ import std.algorithm,
        std.json,
        std.path;
 
+import gl4d;
+
+static import sjplayer;
+
 import sj.AbstractGame,
        sj.Args,
        sj.FontSet,
@@ -35,11 +39,15 @@ class Game : AbstractGame {
     fonts_    = new FontSet;
     programs_ = new ProgramSet;
 
+    posteffect_ = new sjplayer.PostEffect(
+        programs_.Get!(sjplayer.PostEffectProgram),
+        vec2i(args.window_size, args.window_size));
+
     lobby_ = new LobbyWorld(programs_);
 
     title_  = new TitleScene(lobby_, programs_);
     select_ = new SelectScene(lobby_, programs_, fonts_, music_list_);
-    load_   = new LoadingScene(args, lobby_, programs_, fonts_);
+    load_   = new LoadingScene(lobby_, posteffect_, programs_, fonts_);
     play_   = new PlayScene;
     result_ = new ResultScene(lobby_, programs_, fonts_);
 
@@ -59,6 +67,11 @@ class Game : AbstractGame {
       title_.Initialize();
       super(title_);
     }
+
+    // setup OpenGL
+    gl.Enable(GL_BLEND);
+    gl.BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    gl.Disable(GL_DEPTH_TEST);
   }
 
   ~this() {
@@ -69,6 +82,7 @@ class Game : AbstractGame {
     result_.destroy();
 
     lobby_.destroy();
+    posteffect_.destroy();
 
     fonts_.destroy();
     programs_.destroy();
@@ -76,13 +90,26 @@ class Game : AbstractGame {
     music_list_.each!destroy();
   }
 
+  override void Draw() {
+    gl.Clear(GL_COLOR_BUFFER_BIT);
+
+    posteffect_.BindFramebuffer();
+    gl.Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    super.Draw();
+    posteffect_.UnbindFramebuffer();
+
+    posteffect_.DrawFramebuffer();
+  }
+
  private:
   Music[] music_list_;
 
   FontSet    fonts_;
   ProgramSet programs_;
 
-  LobbyWorld lobby_;
+  sjplayer.PostEffect posteffect_;
+  LobbyWorld          lobby_;
 
   TitleScene   title_;
   SelectScene  select_;
diff --git a/src/sj/LoadingScene.d b/src/sj/LoadingScene.d
index bfc5789..1130983 100644
--- a/src/sj/LoadingScene.d
+++ b/src/sj/LoadingScene.d
@@ -3,8 +3,9 @@ module sj.LoadingScene;
 
 import gl4d;
 
-import sj.Args,
-       sj.FontSet,
+static import sjplayer;
+
+import sj.FontSet,
        sj.KeyInput,
        sj.LobbyWorld,
        sj.Music,
@@ -17,14 +18,14 @@ class LoadingScene : SceneInterface {
  public:
   ///
   this(
-      in ref Args args,
-      LobbyWorld  lobby,
-      ProgramSet  programs,
-      FontSet     fonts) {
-    args_     = args;
-    lobby_    = lobby;
-    programs_ = programs;
-    fonts_    = fonts;
+      LobbyWorld          lobby,
+      sjplayer.PostEffect posteffect,
+      ProgramSet          programs,
+      FontSet             fonts) {
+    lobby_      = lobby;
+    posteffect_ = posteffect;
+    programs_   = programs;
+    fonts_      = fonts;
   }
   ~this() {
   }
@@ -44,8 +45,7 @@ class LoadingScene : SceneInterface {
   override SceneInterface Update(KeyInput input) {
     if (first_drawn_) {
       // TODO: parallelize context creation
-      auto context = music_.CreatePlayerContext(
-          vec2i(args_.window_size, args_.window_size), programs_.player);
+      auto context = music_.CreatePlayerContext(posteffect_, programs_.player);
       play_scene_.Initialize(music_, context, offset_beat_);
       return play_scene_;
     }
@@ -57,9 +57,7 @@ class LoadingScene : SceneInterface {
   }
 
  private:
-  const Args args_;
-
-  PlayScene play_scene_;
+  sjplayer.PostEffect posteffect_;
 
   ProgramSet programs_;
 
@@ -67,6 +65,8 @@ class LoadingScene : SceneInterface {
 
   LobbyWorld lobby_;
 
+  PlayScene play_scene_;
+
   Music music_;
   float offset_beat_;
 
diff --git a/src/sj/LobbyWorld.d b/src/sj/LobbyWorld.d
index 9658e8d..a91507a 100644
--- a/src/sj/LobbyWorld.d
+++ b/src/sj/LobbyWorld.d
@@ -37,15 +37,13 @@ class LobbyWorld {
 
   ///
   void Draw() {
-    gl.Disable(GL_DEPTH_TEST);
-    gl.DepthMask(false);
     background_.Draw();
 
     gl.Enable(GL_DEPTH_TEST);
-    gl.DepthMask(true);
     cube_program_.Draw(
         CreateCubes(cube_matrix.Create(), cube_interval)[],
         Projection, view.Create(), light_pos, cube_material);
+    gl.Disable(GL_DEPTH_TEST);
   }
 
   ///
diff --git a/src/sj/Music.d b/src/sj/Music.d
index 902a855..721cb68 100644
--- a/src/sj/Music.d
+++ b/src/sj/Music.d
@@ -83,9 +83,9 @@ class Music {
 
   ///
   sjplayer.Context CreatePlayerContext(
-      vec2i winsz, sjplayer.ProgramSet programs) const {
+      sjplayer.PostEffect posteffect, sjplayer.ProgramSet programs) const {
     return sjplayer.CreateContextFromText(
-        script_path_.readText, winsz, programs);
+        script_path_.readText, posteffect, programs);
   }
 
   ///
diff --git a/src/sj/PlayScene.d b/src/sj/PlayScene.d
index 3049aa6..c33ecb3 100644
--- a/src/sj/PlayScene.d
+++ b/src/sj/PlayScene.d
@@ -74,14 +74,10 @@ class PlayScene : SceneInterface {
     return this;
   }
   override void Draw() {
-    context_.StartDrawing();
-
     context_.DrawBackground();
     context_.DrawElements();
     context_.DrawActor();
 
-    context_.EndDrawing();
-
     if (beat_ >= context_.length) {
       context_.destroy();
     }