add noise shader to laser graphics

objects/enemy/laser_wall.gd

@@ -6,6 +6,7 @@ export var laser_time = 0.5
 onready var line = $Laser
 onready var cast = $RayCast2D
 onready var timer = $Timer
+onready var sparks = $SparkParticles
 
 func _ready():
 	_disable_laser()
@@ -14,11 +15,15 @@ func _physics_process(delta):
 	if cast.is_colliding():
 		line.points[1].y = line.to_local(cast.get_collision_point()).y
 		line.visible = true
+		sparks.global_position.y = cast.get_collision_point().y
+		sparks.emitting = true
+		
 		var collider = cast.get_collider()
 		if collider.is_in_group("player"):
 			collider.get_parent().die()
 	else:
 		line.visible = false
+		sparks.emitting = false
 
 func _enable_laser():
 	cast.enabled = true

objects/enemy/laser_wall.tscn

@@ -1,11 +1,22 @@
-[gd_scene load_steps=3 format=2]
+[gd_scene load_steps=7 format=2]
 
 [ext_resource path="res://graphics/enemy/laser_wall.png" type="Texture" id=1]
 [ext_resource path="res://objects/enemy/laser_wall.gd" type="Script" id=2]
+[ext_resource path="res://shaders/color_noise.gdshader" type="Shader" id=3]
+[ext_resource path="res://graphics/particles/dust.png" type="Texture" id=4]
+
+[sub_resource type="ShaderMaterial" id=1]
+shader = ExtResource( 3 )
+shader_param/animate_noise = true
+shader_param/noise_intensity = 0.5
+
+[sub_resource type="Curve" id=2]
+_data = [ Vector2( 0, 1 ), 0.0, -1.45746, 0, 0, Vector2( 1, 0 ), 0.00323196, 0.0, 0, 0 ]
 
 [node name="LaserWall" type="Node2D"]
 script = ExtResource( 2 )
 blood = false
+speed = 16
 flip_sprite = false
 
 [node name="Sprite" type="Sprite" parent="."]
@@ -13,7 +24,7 @@ texture = ExtResource( 1 )
 centered = false
 
 [node name="Laser" type="Line2D" parent="."]
-visible = false
+material = SubResource( 1 )
 position = Vector2( 4, 2 )
 points = PoolVector2Array( 0, 0, 0, 8 )
 width = 2.0
@@ -27,3 +38,19 @@ collide_with_areas = true
 [node name="Timer" type="Timer" parent="."]
 process_mode = 0
 one_shot = true
+
+[node name="SparkParticles" type="CPUParticles2D" parent="."]
+position = Vector2( 4, 0 )
+amount = 16
+lifetime = 0.5
+texture = ExtResource( 4 )
+spread = 180.0
+gravity = Vector2( 0, 0 )
+initial_velocity = 30.0
+initial_velocity_random = 0.5
+damping = 50.0
+angle = 720.0
+angle_random = 1.0
+scale_amount = 0.3
+scale_amount_curve = SubResource( 2 )
+color = Color( 1, 1, 0.290196, 1 )

shaders/color_noise.gdshader

@@ -0,0 +1,17 @@
+shader_type canvas_item;
+
+uniform bool animate_noise = false;
+uniform float noise_intensity = 1.0;
+
+float random (vec2 uv) {
+    return fract(sin(dot(uv.xy,
+        vec2(12.9898,78.233))) * 43758.5453123);
+}
+
+void fragment() {
+	vec2 noise_uv = SCREEN_UV + TIME * float(animate_noise);
+	float noise = random(noise_uv);
+	noise = mix(1.0 - noise_intensity, 1.0, noise);
+	
+	COLOR = vec4(COLOR.rgb * noise, COLOR.a);
+}