Zombie flash

assets/shaders/CG_color_blender.gdshader

@@ -0,0 +1,16 @@
+shader_type canvas_item;
+render_mode unshaded;
+
+uniform sampler2D screen_texture : hint_screen_texture, repeat_disable, filter_nearest;
+uniform vec4 blend_color : source_color;
+uniform float amount : hint_range(0,1,0.01);
+
+void fragment() {
+	vec4 c = textureLod(screen_texture, SCREEN_UV, 0.0);
+
+	if (c.a > 0.0001) {
+		c.rgb /= c.a;
+	}
+
+	COLOR *= mix(c,blend_color * c.a,amount);
+}

scenes/entities/Zombies/zombie.tscn

@@ -1,11 +1,19 @@
-[gd_scene load_steps=23 format=3 uid="uid://co11v3w8hbwgf"]
+[gd_scene load_steps=26 format=3 uid="uid://co11v3w8hbwgf"]
 
 [ext_resource type="Script" path="res://scripts/components/zombies/RuntimeZombieData.cs" id="1_qq3f1"]
 [ext_resource type="Texture2D" uid="uid://bwwbkybryi6k0" path="res://assets/sprites/zombie.tres" id="2_4pdxh"]
+[ext_resource type="Shader" path="res://assets/shaders/CG_color_blender.gdshader" id="2_srwwe"]
 [ext_resource type="Script" path="res://scripts/components/zombies/EatBox.cs" id="3_2aulo"]
+[ext_resource type="Script" path="res://scripts/components/FlashComponent.cs" id="3_rao3m"]
 [ext_resource type="Script" path="res://scripts/components/zombies/ZombieMover.cs" id="4_u5syx"]
 [ext_resource type="Script" path="res://scripts/components/zombies/behaviours/BasicZombieBehaviour.cs" id="5_2pvkr"]
 
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_63ls2"]
+resource_local_to_scene = true
+shader = ExtResource("2_srwwe")
+shader_parameter/blend_color = Color(1, 1, 1, 1)
+shader_parameter/amount = null
+
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_hxyad"]
 size = Vector2(24, 84)
 
@@ -151,7 +159,11 @@ graph_offset = Vector2(-17, -2)
 script = ExtResource("1_qq3f1")
 _maxHP = 100
 
-[node name="Sprite" type="Sprite2D" parent="."]
+[node name="CanvasGroup" type="CanvasGroup" parent="."]
+material = SubResource("ShaderMaterial_63ls2")
+script = ExtResource("3_rao3m")
+
+[node name="Sprite" type="Sprite2D" parent="CanvasGroup"]
 position = Vector2(0, -44)
 texture = ExtResource("2_4pdxh")
 
@@ -192,5 +204,8 @@ script = ExtResource("4_u5syx")
 [node name="Behaviour" type="Node" parent="."]
 script = ExtResource("5_2pvkr")
 
+[node name="Node" type="Node" parent="."]
+
+[connection signal="OnHPChanged" from="." to="CanvasGroup" method="DamageFlash"]
 [connection signal="area_entered" from="Eatbox" to="Eatbox" method="OnAreaEntered"]
 [connection signal="area_exited" from="Eatbox" to="Eatbox" method="OnAreaExited"]

scripts/components/FlashComponent.cs

@@ -0,0 +1,34 @@
+using Godot;
+using System;
+
+public partial class FlashComponent : CanvasGroup
+{
+	[Export] private float _flashDuration = 0.1f;
+	private Tween _tween;
+	private ShaderMaterial _shaderMaterial;
+
+    public override void _Ready()
+    {
+        _shaderMaterial = Material as ShaderMaterial;
+    }
+	
+	public void DamageFlash(int damage)
+	{
+		Flash();
+	}
+    
+    
+	public void Flash()
+	{
+		_tween?.Kill();
+		_tween = CreateTween();
+
+		Action<float> action = SetAmount;
+		_tween.TweenMethod(Callable.From(action),1.0f,0.0f,_flashDuration);
+	}
+
+	private void SetAmount(float amount)
+	{
+		_shaderMaterial.SetShaderParameter("amount",amount);
+	}
+}

scripts/components/zombies/RuntimeZombieData.cs

@@ -3,6 +3,9 @@ using System;
 
 public partial class RuntimeZombieData : Node2D, IEntity
 {
+    [Signal]
+    public delegate void OnHPChangedEventHandler(int deltaHP);
+
     private int _hp;
     [Export]
     private int _maxHP;
@@ -22,6 +25,7 @@ public partial class RuntimeZombieData : Node2D, IEntity
     public void Heal(int amount)
     {
         _hp += amount;
+        EmitSignal(SignalName.OnHPChanged,amount);
 
         if (MaxHp > 0)
         {
@@ -32,10 +36,12 @@ public partial class RuntimeZombieData : Node2D, IEntity
     public void TakeDamage(int amount)
     {
         _hp -= amount;
+        EmitSignal(SignalName.OnHPChanged,-amount);
 
         if (_hp <= 0)
         {
             QueueFree();
+            
         }
     }
 }