game: add slime enemy

assets/shaders/base_color_tint.gdshader

@@ -0,0 +1,9 @@
+shader_type canvas_item;
+
+uniform vec4 base_color : source_color = vec4(1.0, 0.2, 0.2, 1.0); // tint color
+
+void fragment() {
+    vec4 tex = texture(TEXTURE, UV);
+	
+    COLOR = vec4(base_color.rgb * tex.r, tex.a);
+}

assets/shaders/base_color_tint.gdshader.uid

@@ -0,0 +1 @@
+uid://cf48pgfl308o3

assets/sprites/slime_small grayscale.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://ctob5me7woid8"
+path="res://.godot/imported/slime_small grayscale.png-b5ea2536903e774dce2837ff19f6ad76.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/sprites/slime_small grayscale.png"
+dest_files=["res://.godot/imported/slime_small grayscale.png-b5ea2536903e774dce2837ff19f6ad76.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

assets/sprites/slime_small.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bfj2h2jp1w60p"
+path="res://.godot/imported/slime_small.png-a01d407ba84c2dd70ce8b2ef5c142cae.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/sprites/slime_small.png"
+dest_files=["res://.godot/imported/slime_small.png-a01d407ba84c2dd70ce8b2ef5c142cae.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

scenes/enemies/enemy_base.gd

@@ -17,6 +17,7 @@ extends CharacterBody2D
 @onready var sprite_2d: Sprite2D = $Sprite2D
 
 var player: Player
+var enemy_name: String
 var target: Node2D
 var god_mode: bool = false
 var is_dead: bool = false
@@ -27,6 +28,7 @@ var _path_update_timer: float = 0.0
 
 func _ready() -> void:
 	health = max_health
+	enemy_name = _gen_name()
 	shape_cast_2d.shape.radius = collision_shape_2d.shape.radius
 	shape_cast_2d.enabled = false
 	sprite_2d.material = sprite_2d.material.duplicate()
@@ -38,6 +40,8 @@ func _find_player():
 		player = get_tree().get_first_node_in_group(GlobalConst.GROUP_PLAYER)
 		target = player
 
+func _gen_name() -> String:
+	return "Unnamed enemy"
 
 func _physics_process(delta: float) -> void:
 	if not target:

scenes/enemies/enemy_slime_small.gd

@@ -0,0 +1,19 @@
+class_name EnemySlimeSmall
+extends EnemyBase
+
+@export var color: Color = Color.CHARTREUSE
+@onready var disabled_sprite: Sprite2D = $Sprite2D
+@onready var base_sprite: Sprite2D = $Sprite/BaseSprite
+
+var shader = preload("res://assets/shaders/base_color_tint.gdshader")
+var shader_material: ShaderMaterial
+
+func _ready() -> void:
+	shader_material = ShaderMaterial.new()
+	disabled_sprite.visible = false
+	set_color(color)
+	shader_material.shader = shader
+	base_sprite.material = shader_material
+
+func set_color(new_color: Color) -> void:
+	shader_material.set_shader_parameter("base_color", new_color)

scenes/enemies/enemy_slime_small.gd.uid

@@ -0,0 +1 @@
+uid://c5wgwy5itcnkk

scenes/enemies/enemy_slime_small.tscn

@@ -0,0 +1,41 @@
+[gd_scene load_steps=9 format=3 uid="uid://cjikar11hbp3b"]
+
+[ext_resource type="PackedScene" uid="uid://b7vq8xspnlyeu" path="res://scenes/enemies/enemy_base.tscn" id="1_o6v6p"]
+[ext_resource type="Script" uid="uid://c5wgwy5itcnkk" path="res://scenes/enemies/enemy_slime_small.gd" id="2_2bnvq"]
+[ext_resource type="Shader" uid="uid://cf48pgfl308o3" path="res://assets/shaders/base_color_tint.gdshader" id="3_2yvgl"]
+[ext_resource type="Texture2D" uid="uid://ctob5me7woid8" path="res://assets/sprites/slime_small grayscale.png" id="3_iaao1"]
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_daihb"]
+shader = ExtResource("3_2yvgl")
+shader_parameter/base_color = Color(3.46541e-06, 0.969973, 0.260278, 1)
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_2yvgl"]
+atlas = ExtResource("3_iaao1")
+region = Rect2(0, 15, 16, 15)
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_daihb"]
+atlas = ExtResource("3_iaao1")
+region = Rect2(0, 30, 16, 15)
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_wu20c"]
+atlas = ExtResource("3_iaao1")
+region = Rect2(0, 45, 16, 15)
+
+[node name="EnemySlimeSmall" instance=ExtResource("1_o6v6p")]
+script = ExtResource("2_2bnvq")
+color = Color(0.498039, 1, 0, 1)
+
+[node name="Sprite" type="Node2D" parent="." index="0"]
+
+[node name="BaseSprite" type="Sprite2D" parent="Sprite" index="0"]
+material = SubResource("ShaderMaterial_daihb")
+texture = SubResource("AtlasTexture_2yvgl")
+
+[node name="Highlights" type="Sprite2D" parent="Sprite" index="1"]
+texture = SubResource("AtlasTexture_daihb")
+
+[node name="Shading" type="Sprite2D" parent="Sprite" index="2"]
+texture = SubResource("AtlasTexture_wu20c")
+
+[node name="Sprite2D" parent="." index="1"]
+visible = false

scenes/managers/enemy_manager.gd

@@ -10,7 +10,8 @@ extends Node2D
 
 const ENEMY_RAT = preload("res://scenes/enemies/enemy_rat.tscn")
 const ENEMY_BAT = preload("res://scenes/enemies/enemy_bat.tscn")
-
+const ENEMY_SLIME_SMALL = preload("res://scenes/enemies/enemy_slime_small.tscn")
+const SLIME_COLOR_VARIATIONS: Array[Color]= [ Color.CHARTREUSE, Color.FUCHSIA, Color.DARK_ORANGE ]
 
 func _ready() -> void:
 	timer.wait_time = 1 / spawn_rate
@@ -23,16 +24,21 @@ func _on_timer_timeout() -> void:
 	var enemies = get_tree().get_nodes_in_group(GlobalConst.GROUP_ENEMY)
 	GlobalConst.sig_debug_stats_set.emit("enemy_count", "%s" % len(enemies))
 	var next_enemy: PackedScene
-	match randi() % 2:
+	match randi() % 3:
 		0:
 			next_enemy = ENEMY_BAT
 		1:
 			next_enemy = ENEMY_RAT
+		2:
+			next_enemy = ENEMY_SLIME_SMALL
 
 	if len(enemies) < max_enemies:
 		var new_enemy = next_enemy.instantiate()
 		new_enemy.position = _get_spawn_pos()
 		new_enemy.target = target
+		if is_instance_of(new_enemy, EnemySlimeSmall):
+			var slime_color: Color = SLIME_COLOR_VARIATIONS.pick_random()
+			new_enemy.color = slime_color
 		add_child(new_enemy)