Added corruption shader

game/levels/abstract_level.gd

@@ -2,17 +2,34 @@ class_name AbstractLevel
 extends Node2D
 
 
+@export var initial_corruption_x := 0.0
+@export var corruption_speed := 0.0
+
+
+var _corruption_x: float
+
+
 @onready var player : Player = $Player
 @onready var pause_menu : PauseMenu = $%PauseMenu
 
+@onready var level_material : ShaderMaterial = $%LevelColorRect.material
+
 
 func _ready() -> void:
-	$Menus.show()
+	_corruption_x = initial_corruption_x
 	pause_menu.hide()
 	
 	#TODO Add gameplay music
 
 
+func _process(delta: float) -> void:
+	_corruption_x += corruption_speed * delta
+
+	var screen_to_world := player.camera.get_canvas_transform().affine_inverse()
+	level_material.set_shader_parameter("screen_to_world", screen_to_world)
+	level_material.set_shader_parameter("corruption_x", _corruption_x)
+
+
 func _input(event: InputEvent) -> void:
 	if event.is_action_pressed("pause"):
 		SoundManager.play_ui_stream(SoundManager.ui_stream_accept)