Added Glitch Room Source code to Gitty

games/galaga/actors/Enemy.tscn

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+[gd_scene load_steps=2 format=3]
+[ext_resource type="Script" path="res://games/galaga/actors/actor.gd" id="1"]
+[node name="Enemy" type="Node2D"]
+script = ExtResource("1")
+kind = "boss"
+radius = 6.0

games/galaga/actors/Explosion.tscn

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+[gd_scene load_steps=2 format=3]
+[ext_resource type="Script" path="res://games/galaga/actors/actor.gd" id="1"]
+[node name="Explosion" type="Node2D"]
+script = ExtResource("1")
+kind = "explosion"
+radius = 0.0

games/galaga/actors/Fighter.tscn

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+[gd_scene load_steps=2 format=3]
+[ext_resource type="Script" path="res://games/galaga/actors/actor.gd" id="1"]
+[node name="Fighter" type="Node2D"]
+script = ExtResource("1")
+kind = "fighter"
+radius = 6.0

games/galaga/actors/Projectile.tscn

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+[gd_scene load_steps=2 format=3]
+[ext_resource type="Script" path="res://games/galaga/actors/actor.gd" id="1"]
+[node name="Projectile" type="Node2D"]
+script = ExtResource("1")
+kind = "shot"
+radius = 2.0

games/galaga/actors/actor.gd

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+@tool
+extends Node2D
+## Visual and collision bounds share the node origin, in native game pixels.
+@export_enum("fighter", "boss", "butterfly", "bee", "shot", "enemy_shot", "explosion", "enemy_explosion") var kind := "fighter":
+	set(value):
+		kind = value
+		queue_redraw()
+@export var damaged := false
+@export var radius := 6.0
+var animation_time := 0.0
+var spinning := false
+var spin_time := 0.0
+@export var heading := Vector2.DOWN
+const SHEET = preload("res://games/galaga/art/spr_galaga.png")
+const DIRECTION_ROWS := {"boss":36, "boss_damaged":54, "butterfly":72, "bee":108}
+
+func _ready() -> void:
+	texture_filter = CanvasItem.TEXTURE_FILTER_NEAREST
+	if kind not in ["shot", "enemy_shot"]:
+		var sprite_material := ShaderMaterial.new()
+		sprite_material.shader = preload("res://games/galaga/actors/sprite.gdshader")
+		material = sprite_material
+
+func _process(_delta: float) -> void:
+	queue_redraw()
+
+func _draw() -> void:
+	# Quantize the rendered center in native 224x288 coordinates, before the
+	# view's integer enlargement. Keep simulation positions precise.
+	draw_set_transform(position.round()-position)
+	if kind in ["shot", "enemy_shot"]:
+		draw_rect(Rect2(-1, -3, 2, 6), Color.CYAN if kind == "shot" else Color.SALMON)
+		return
+	if kind == "explosion":
+		var frame := mini(3, int(animation_time * 12))
+		draw_texture_rect_region(SHEET, Rect2(-16,-16,32,32), Rect2(145 + frame * 34, 1, 32,32))
+		return
+	if kind == "enemy_explosion":
+		var frame := mini(4, int(animation_time * 15))
+		draw_texture_rect_region(SHEET, Rect2(-16,-16,32,32), Rect2(289+frame*34,1,32,32))
+		return
+	var source := Vector2(108,0)
+	var destination := Rect2(-8,-8,16,16)
+	if kind=="fighter" and spinning:
+		var facing := Vector2.UP.rotated(spin_time*TAU*2)
+		var column := 6-clampi(roundi(atan2(absf(facing.x),absf(facing.y))/(PI/12)),0,6)
+		source=Vector2(column*18,0)
+		if facing.x>0: destination.size.x=-16
+		if facing.y>0: destination.size.y=-16
+	if kind in ["boss", "butterfly", "bee"]:
+		# Seven authored angles from right to down, at 15-degree intervals.
+		# Mirror these pixels into the other quadrants; never rotate the texture.
+		var column := 6 - clampi(roundi(atan2(absf(heading.x),absf(heading.y))/(PI/12)),0,6)
+		# Adjacent rows are different sprites, not interchangeable wing frames.
+		var row: int = DIRECTION_ROWS["boss_damaged" if kind == "boss" and damaged else kind]
+		source = Vector2(column*18,row)
+		if heading.x < 0: destination.size.x = -16
+		if heading.y < 0: destination.size.y = -16
+	draw_texture_rect_region(SHEET, destination, Rect2(source+Vector2.ONE,Vector2(16,16)))
+	if Engine.is_editor_hint():
+		draw_arc(Vector2.ZERO, radius, 0, TAU, 24, Color(0,1,0,0.5))

games/galaga/actors/actor.gd.uid

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+uid://c8jf7ijduugag

games/galaga/actors/sprite.gdshader

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+shader_type canvas_item;
+render_mode unshaded;
+void fragment() {
+	vec4 pixel = texture(TEXTURE, UV);
+	if (max(pixel.r, max(pixel.g, pixel.b)) < 0.02) { discard; }
+	COLOR *= pixel;
+}

games/galaga/actors/sprite.gdshader.uid

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+uid://m8sm8co7m5hs