add player stun postprocessing effect

Characters/Player.cs

@@ -137,7 +137,8 @@ public sealed partial class Player : Character
     {
         base.Stun(time);
         Camera.Shake(2, 0.8f);
-        // TODO: implement visual effects for stun
+        Events.EventBus.Instance.EmitSignal(
+            Events.EventBus.SignalName.PlayerStun);
     }
 
     protected override void OnReceivedDamage(

Events/EventBus.cs

@@ -33,6 +33,9 @@ public partial class EventBus : Node
     [Signal]
     public delegate void PlayerHealthChangedEventHandler(HealthChangedArgs args);
 
+    [Signal]
+    public delegate void PlayerStunEventHandler();
+
     [Signal]
     public delegate void RegisteredBossEventHandler(Characters.Boss boss);
 

Shaders/Grayscale.gdshader

@@ -0,0 +1,11 @@
+shader_type canvas_item;
+
+uniform float grayscale_intensity : hint_range(0.0, 1.0) = 0.0;
+
+uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;
+
+void fragment() {
+    vec4 color = texture(SCREEN_TEXTURE, SCREEN_UV);
+    float average = (color.r + color.g + color.b) / 3.0;
+    COLOR = vec4(vec3(average), grayscale_intensity);
+}

UI/Base.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=10 format=3 uid="uid://c271rdjhd1gfo"]
+[gd_scene load_steps=14 format=3 uid="uid://c271rdjhd1gfo"]
 
 [ext_resource type="PackedScene" uid="uid://73jm5qjy52vq" path="res://Dialogue/balloon.tscn" id="1_atjb1"]
 [ext_resource type="Script" path="res://UI/UIController.cs" id="2_b4b6l"]
@@ -9,6 +9,13 @@
 [ext_resource type="PackedScene" uid="uid://sfs8dpfitpdu" path="res://UI/Hotbar.tscn" id="5_mmp18"]
 [ext_resource type="PackedScene" uid="uid://d3q1yu3n7cqfj" path="res://UI/SceneTransition.tscn" id="6_j0nhv"]
 [ext_resource type="PackedScene" uid="uid://2afbrf8asy2a" path="res://UI/PostProcessing/Vignette.tscn" id="9_p1ubd"]
+[ext_resource type="PackedScene" uid="uid://b1wsryv4bn0cn" path="res://UI/PostProcessing/StunEffect.tscn" id="10_646ma"]
+[ext_resource type="Shader" path="res://Shaders/Grayscale.gdshader" id="11_w4gn1"]
+[ext_resource type="Texture2D" uid="uid://bw052v8ikfget" path="res://icon.svg" id="12_tyv35"]
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_kbd61"]
+shader = ExtResource("11_w4gn1")
+shader_parameter/grayscale_intensity = 0.0
 
 [node name="BaseUI" type="CanvasLayer"]
 process_mode = 3
@@ -105,7 +112,22 @@ layout_mode = 2
 [node name="SceneTransition" parent="SubViewportContainer/UIViewport/MainUILayer" instance=ExtResource("6_j0nhv")]
 z_index = 1
 
-[node name="PostProcessing" type="CanvasLayer" parent="SubViewportContainer/UIViewport"]
+[node name="PostProcessing" type="CanvasLayer" parent="."]
-layer = 2
 
-[node name="TextureRect" parent="SubViewportContainer/UIViewport/PostProcessing" instance=ExtResource("9_p1ubd")]
+[node name="Vignette" parent="PostProcessing" instance=ExtResource("9_p1ubd")]
+
+[node name="StunEffect" parent="PostProcessing" instance=ExtResource("10_646ma")]
+
+[node name="Sprite2D" type="TextureRect" parent="PostProcessing"]
+visible = false
+material = SubResource("ShaderMaterial_kbd61")
+anchors_preset = 3
+anchor_left = 1.0
+anchor_top = 1.0
+anchor_right = 1.0
+anchor_bottom = 1.0
+offset_left = -128.0
+offset_top = -128.0
+grow_horizontal = 0
+grow_vertical = 0
+texture = ExtResource("12_tyv35")

UI/PostProcessing/StunEffect.cs

@@ -0,0 +1,15 @@
+using Godot;
+
+namespace SupaLidlGame.UI.PostProcessing;
+
+public partial class StunEffect : ColorRect
+{
+    public override void _Ready()
+    {
+        Events.EventBus.Instance.PlayerStun += () =>
+        {
+            GD.Print("PLAYER STUNNED!!!");
+            GetNode<AnimationPlayer>("AnimationPlayer").Play("tighten");
+        };
+    }
+}

UI/PostProcessing/StunEffect.tscn

@@ -0,0 +1,58 @@
+[gd_scene load_steps=7 format=3 uid="uid://b1wsryv4bn0cn"]
+
+[ext_resource type="Shader" path="res://Shaders/Grayscale.gdshader" id="2_dlm7y"]
+[ext_resource type="Script" path="res://UI/PostProcessing/StunEffect.cs" id="3_h8rlj"]
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_uawkd"]
+shader = ExtResource("2_dlm7y")
+shader_parameter/grayscale_intensity = 0.0
+
+[sub_resource type="Animation" id="Animation_5d4h1"]
+length = 0.001
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath(".:material:shader_parameter/grayscale_intensity")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [0.0]
+}
+
+[sub_resource type="Animation" id="Animation_txpv1"]
+resource_name = "tighten"
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath(".:material:shader_parameter/grayscale_intensity")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0, 1),
+"transitions": PackedFloat32Array(1, 1),
+"update": 0,
+"values": [1.0, 0.0]
+}
+
+[sub_resource type="AnimationLibrary" id="AnimationLibrary_kyxik"]
+_data = {
+"RESET": SubResource("Animation_5d4h1"),
+"tighten": SubResource("Animation_txpv1")
+}
+
+[node name="StunEffect" type="ColorRect"]
+material = SubResource("ShaderMaterial_uawkd")
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("3_h8rlj")
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="."]
+libraries = {
+"": SubResource("AnimationLibrary_kyxik")
+}

UI/PostProcessing/Vignette.tscn

@@ -7,7 +7,7 @@
 [sub_resource type="ShaderMaterial" id="ShaderMaterial_fmdjb"]
 shader = ExtResource("1_nrekm")
 shader_parameter/vignette_intensity = 0.1
-shader_parameter/vignette_opacity = 0.1
+shader_parameter/vignette_opacity = 0.2
 shader_parameter/vignette_rgb = Color(0, 0, 0, 1)
 
 [sub_resource type="Animation" id="Animation_ph4f2"]
@@ -34,7 +34,7 @@ tracks/1/keys = {
 "times": PackedFloat32Array(0),
 "transitions": PackedFloat32Array(1),
 "update": 0,
-"values": [0.1]
+"values": [0.2]
 }
 
 [sub_resource type="Animation" id="Animation_sqaf2"]
@@ -50,7 +50,7 @@ tracks/0/keys = {
 "times": PackedFloat32Array(0, 0.2, 0.5),
 "transitions": PackedFloat32Array(1, 1, 1),
 "update": 0,
-"values": [0.1, 0.1, 0.1]
+"values": [0.4, 0.1, 0.1]
 }
 tracks/1/type = "value"
 tracks/1/imported = false
@@ -62,7 +62,7 @@ tracks/1/keys = {
 "times": PackedFloat32Array(0.2, 0.5),
 "transitions": PackedFloat32Array(1, 0.25),
 "update": 0,
-"values": [1.0, 0.1]
+"values": [1.0, 0.2]
 }
 
 [sub_resource type="AnimationLibrary" id="AnimationLibrary_s4mrn"]
@@ -71,7 +71,7 @@ _data = {
 "tighten": SubResource("Animation_sqaf2")
 }
 
-[node name="TextureRect" type="TextureRect"]
+[node name="Vignette" type="TextureRect"]
 material = SubResource("ShaderMaterial_fmdjb")
 anchors_preset = 15
 anchor_right = 1.0