add simple reflection

godot/src/base-system/RelativeRemoteTransform2D.gd

@@ -0,0 +1,8 @@
+class_name RelativeRemoteTransform2D
+extends Node2D
+
+@export var remote_node: Node2D
+@export var relative_to_origin := 1.1
+
+func _process(delta):
+	remote_node.global_position = global_position * relative_to_origin

godot/src/character/player_reflection.tscn

@@ -0,0 +1,14 @@
+[gd_scene load_steps=4 format=3 uid="uid://1sccjkvbts1e"]
+
+[ext_resource type="Texture2D" uid="uid://wi47ngkwkxbc" path="res://assets/Gura__Trident_Mirror.png" id="1_awrgi"]
+[ext_resource type="Script" path="res://src/character/MirrorSprite2D.gd" id="2_21pk6"]
+[ext_resource type="Texture2D" uid="uid://co8dko7iojh8p" path="res://assets/Gura__Trident_Normal.png" id="3_4mtbe"]
+
+[node name="PlayerReflection" type="Node2D"]
+
+[node name="MirrorSprite2D" type="Sprite2D" parent="."]
+position = Vector2(3, -2)
+texture = ExtResource("1_awrgi")
+hframes = 4
+script = ExtResource("2_21pk6")
+mirror_texture = ExtResource("3_4mtbe")

godot/src/game.gd

@@ -5,6 +5,7 @@ const ROOM = preload("res://src/props/room.tscn")
 @onready var cam = $Camera2D
 @onready var player = $Player
 @onready var music_player = $MusicPlayer
+@onready var mirror_viewport = $MirrorViewport
 
 @export var enemy_value := 5.0
 @export var enemy_kills := 5.0
@@ -42,6 +43,9 @@ func _setup_next_room(current_room: Room):
 
 func _create_room() -> Room:
 	var room = ROOM.instantiate()
+	var mat = room.material as ShaderMaterial
+	mat.set_shader_parameter("reflection_viewport", mirror_viewport.get_viewport().get_texture())
+
 	room.finished.connect(func():
 		_setup_next_room(room)
 		GameManager.room_done()

godot/src/game.tscn

@@ -1,9 +1,11 @@
-[gd_scene load_steps=9 format=3 uid="uid://di8g8e6s34cik"]
+[gd_scene load_steps=11 format=3 uid="uid://di8g8e6s34cik"]
 
 [ext_resource type="Script" path="res://src/game.gd" id="1_fscq0"]
+[ext_resource type="Script" path="res://src/base-system/RelativeRemoteTransform2D.gd" id="3_vvprc"]
 [ext_resource type="AudioStream" uid="uid://cj3tphknhrawu" path="res://assets/sound/Sparkle.mp3" id="4_rug7x"]
 [ext_resource type="AudioStream" uid="uid://bygqjhqr85tjf" path="res://assets/sound/危機.mp3" id="5_3pgwk"]
 [ext_resource type="PackedScene" uid="uid://dlby6flxkmnjs" path="res://src/character/player.tscn" id="6_2xq02"]
+[ext_resource type="PackedScene" uid="uid://1sccjkvbts1e" path="res://src/character/player_reflection.tscn" id="6_bcrcl"]
 
 [sub_resource type="Animation" id="Animation_880qs"]
 length = 0.001
@@ -152,6 +154,11 @@ position_smoothing_enabled = true
 [node name="Player" parent="." instance=ExtResource("6_2xq02")]
 z_index = 10
 
+[node name="RelativeRemoteTransform2D" type="Node2D" parent="Player" node_paths=PackedStringArray("remote_node")]
+script = ExtResource("3_vvprc")
+remote_node = NodePath("../../MirrorViewport/PlayerReflection")
+relative_to_origin = 1.05
+
 [node name="BGM" type="AudioStreamPlayer" parent="."]
 process_mode = 3
 stream = ExtResource("4_rug7x")
@@ -168,5 +175,16 @@ libraries = {
 "": SubResource("AnimationLibrary_06h2n")
 }
 
+[node name="MirrorViewport" type="SubViewport" parent="."]
+transparent_bg = true
+size = Vector2i(384, 224)
+render_target_update_mode = 4
+
+[node name="Camera2D2" type="Camera2D" parent="MirrorViewport"]
+visible = false
+position_smoothing_enabled = true
+
+[node name="PlayerReflection" parent="MirrorViewport" instance=ExtResource("6_bcrcl")]
+
 [connection signal="died" from="Player" to="." method="_on_player_died"]
 [connection signal="reflected" from="Player" to="." method="_on_player_reflected"]

godot/src/tile_mirror.gdshader

@@ -1,5 +1,7 @@
 shader_type canvas_item;
 
+uniform sampler2D reflection_viewport;
+
 uniform vec4 base_color : source_color = vec4(.5, .5, .5, 1.);
 uniform vec4 shine_color : source_color = vec4(1.0);
 uniform float shine_speed : hint_range(0.0, 10.0, 0.1) = 1.0;
@@ -16,6 +18,9 @@ void fragment() {
 		color = base_color;
 		float shine = step(1.0 - shine_size * 0.01, 0.5 + 0.5 * sin(SCREEN_UV.x - SCREEN_UV.y + TIME * shine_speed));
 		color.rgb = mix(color.rgb, shine_color.rgb, shine * shine_color.a);
+
+		vec4 reflection = texture(reflection_viewport, SCREEN_UV);
+		color.rgb = color.rgb * (1.0 - reflection.a) + reflection.rgb * reflection.a;
 	}
 
 	COLOR = color;