Initial workings for simple transitions between scenes.

src/event_manager.odin

@@ -66,13 +66,13 @@ process_events :: proc(game: ^Game) {
 
             intensity := 0.5 + (speed_factor * 4.5) 
             game_trigger_shake(game, intensity, duration = 0.15)
-
             audio_play_sfx(&game.audio, .Ball_Collision)            
 
         case Simple_Event:
             #partial switch e {
             case .Game_Start:
                 set_root_scene(game, make_gameplay_scene())
+    			game.transition = {true, 0, 0.2}
                 audio_fade_in(&game.audio, duration = 1.5)
 
             case .Game_Pause:
@@ -92,6 +92,7 @@ process_events :: proc(game: ^Game) {
 
             case .Game_Main_Menu:
                 set_root_scene(game, make_main_menu())
+    			game.transition = {true, 0, 0.3}
                 audio_fade_out(&game.audio, duration = 1.0)
             
             case .Game_Back:

src/game.odin

@@ -22,10 +22,17 @@ RESOLUTIONS := [?]Resolution{
     {3840, 2160, "3840x2160"},
 }
 
+Transition :: struct {
+	active: bool, 
+    elapsed:  f32,
+    duration: f32,
+}
+
 Game :: struct {
     viewport:     rl.RenderTexture2D,
     bg_texture:   rl.Texture2D, 
     crt_shader:   rl.Shader,
+    transition:   Transition,
     scene_stack:  [dynamic]Scene,
     should_close: bool,
     audio:        Audio_Manager,
@@ -90,6 +97,7 @@ game_init :: proc(game: ^Game) {
         zoom     = 1.0,
     }
 
+    game.transition = {true, 0, 0.2}
     game.should_close = false
     set_root_scene(game, make_main_menu()) 
 }
@@ -121,10 +129,15 @@ game_update :: proc(game: ^Game) {
     }
 
     active_scene := get_active_scene(game)
-    if active_scene != nil {
+
+    if game.transition.active {
+    	game.transition.elapsed += dt    
+        if game.transition.elapsed >= game.transition.duration do game.transition.active = false
+    } else if active_scene != nil {
         scene_update(active_scene, game, input, dt)
     }
 
+
     // background music buffer streaming
     audio_update(&game.audio, dt)
 
@@ -146,13 +159,21 @@ game_render :: proc(game: ^Game) {
             for &scene in game.scene_stack {
                 scene_render(&scene)
             }
+
+            // when game transition active increment its elapsed time
+            // render will check and display accordingly
+            if game.transition.active {
+                a := u8(255 * (1 - clamp(game.transition.elapsed / game.transition.duration, 0, 1)))
+                rl.DrawRectangle(0, 0, VIEWPORT_W, VIEWPORT_H, {0, 0, 0, a})
+            }
         rl.EndMode2D()
 
     rl.EndTextureMode()
 
     render_game_to_window(game)
 
-    rl.DrawFPS(10, game.window_h - 20)
+
+	when DEBUG do rl.DrawFPS(10, game.window_h - 20)
     rl.EndDrawing()
 }
 
@@ -212,4 +233,4 @@ render_game_to_window :: proc(game: ^Game) {
             rl.WHITE,
         ) 
     rl.EndShaderMode()
-}
+}