initial project setup

.editorconfig

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+root = true
+
+[*]
+charset = utf-8

.gitattributes

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+# Normalize EOL for all files that Git considers text files.
+* text=auto eol=lf

.gitignore

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+# Godot 4+ specific ignores
+.godot/
+/android/

autoloads/display.gd

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+extends Node
+
+
+enum ScaleMode {
+	## Stretches to fit as close as possible while maintaining the game's aspect ratio.
+	ASPECT,
+	## Stretches to fit as close as possible while maintaining aspect ratio and an integer scale.
+	INTEGER,
+	## Stretches to cover the whole screen, warping the aspect ratio.
+	STRETCH,
+}
+
+
+## Strategy to use for scaling from game-native resolution to the window/screen size.
+@export var scale_mode: ScaleMode = ScaleMode.ASPECT:
+	set(value):
+		scale_mode = value
+		if is_node_ready():
+			_update_scale()
+
+@export_group("Internal References")
+@export var _viewport: SubViewport
+@export var _viewport_container: SubViewportContainer
+
+
+## The native resolution of the game.
+var size: Vector2i = Vector2i(
+	ProjectSettings.get_setting("display/window/size/viewport_width"),
+	ProjectSettings.get_setting("display/window/size/viewport_height"),
+)
+
+
+func _enter_tree() -> void:
+	get_tree().scene_changed.connect(_on_scene_changed)
+	get_tree().root.size_changed.connect(_update_scale)
+	
+	_update_scale.call_deferred()
+	
+	var current_scene = get_tree().current_scene
+	if current_scene and current_scene != self:
+		current_scene.reparent.call_deferred(_viewport)
+
+
+func _on_scene_changed() -> void:
+	for child in _viewport.get_children():
+		child.queue_free()
+	get_tree().current_scene.reparent(_viewport)
+
+
+func _update_scale() -> void:
+	var screen_size = Vector2(get_tree().root.size)
+	var size_ratio = screen_size / Vector2(size)
+	
+	DisplayServer.window_set_min_size(size)
+	
+	_viewport.size = size
+	_viewport_container.pivot_offset = Vector2(size) * 0.5
+	_viewport_container.position = screen_size * 0.5 - Vector2(size) * 0.5
+	
+	match scale_mode:
+		ScaleMode.ASPECT:
+			# get the minimum ratio and use for both axes
+			var min_scale = minf(size_ratio.x, size_ratio.y)
+			_viewport_container.scale = Vector2(min_scale, min_scale)
+		ScaleMode.INTEGER:
+			# get the minimum ratio and use for both axes after flooring
+			var min_scale = floorf(minf(size_ratio.x, size_ratio.y))
+			_viewport_container.scale = Vector2(min_scale, min_scale)
+		ScaleMode.STRETCH:
+			# just use the ratio as-is
+			_viewport_container.scale = size_ratio

autoloads/display.gd.uid

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+uid://kwa8v1dhwlie

autoloads/display.tscn

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+[gd_scene load_steps=2 format=3 uid="uid://bixq77klfo561"]
+
+[ext_resource type="Script" uid="uid://kwa8v1dhwlie" path="res://autoloads/display.gd" id="1_1seuv"]
+
+[node name="Display" type="Node" node_paths=PackedStringArray("_viewport", "_viewport_container")]
+script = ExtResource("1_1seuv")
+scale_mode = 1
+_viewport = NodePath("SubViewportContainer/SubViewport")
+_viewport_container = NodePath("SubViewportContainer")
+
+[node name="SubViewportContainer" type="SubViewportContainer" parent="."]
+anchors_preset = 8
+anchor_left = 0.5
+anchor_top = 0.5
+anchor_right = 0.5
+anchor_bottom = 0.5
+offset_left = -128.0
+offset_top = -96.0
+offset_right = 128.0
+offset_bottom = 96.0
+grow_horizontal = 2
+grow_vertical = 2
+pivot_offset = Vector2(128, 96)
+
+[node name="SubViewport" type="SubViewport" parent="SubViewportContainer"]
+handle_input_locally = false
+size = Vector2i(256, 192)
+render_target_update_mode = 4

icon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="128" height="128"><rect width="124" height="124" x="2" y="2" fill="#363d52" stroke="#212532" stroke-width="4" rx="14"/><g fill="#fff" transform="translate(12.322 12.322)scale(.101)"><path d="M105 673v33q407 354 814 0v-33z"/><path fill="#478cbf" d="m105 673 152 14q12 1 15 14l4 67 132 10 8-61q2-11 15-15h162q13 4 15 15l8 61 132-10 4-67q3-13 15-14l152-14V427q30-39 56-81-35-59-83-108-43 20-82 47-40-37-88-64 7-51 8-102-59-28-123-42-26 43-46 89-49-7-98 0-20-46-46-89-64 14-123 42 1 51 8 102-48 27-88 64-39-27-82-47-48 49-83 108 26 42 56 81zm0 33v39c0 276 813 276 814 0v-39l-134 12-5 69q-2 10-14 13l-162 11q-12 0-16-11l-10-65H446l-10 65q-4 11-16 11l-162-11q-12-3-14-13l-5-69z"/><path d="M483 600c0 34 58 34 58 0v-86c0-34-58-34-58 0z"/><circle cx="725" cy="526" r="90"/><circle cx="299" cy="526" r="90"/></g><g fill="#414042" transform="translate(12.322 12.322)scale(.101)"><circle cx="307" cy="532" r="60"/><circle cx="717" cy="532" r="60"/></g></svg>

icon.svg.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://diymfwm64gae8"
+path="res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.svg"
+dest_files=["res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+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/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+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
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="Luna Lunatic"
+config/features=PackedStringArray("4.5", "GL Compatibility")
+config/icon="res://icon.svg"
+
+[autoload]
+
+Display="*res://autoloads/display.tscn"
+
+[display]
+
+window/size/viewport_width=256
+window/size/viewport_height=192
+
+[file_customization]
+
+folder_colors={
+"res://autoloads/": "orange"
+}
+
+[rendering]
+
+renderer/rendering_method="gl_compatibility"
+renderer/rendering_method.mobile="gl_compatibility"

test_scene.tscn

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+[gd_scene load_steps=2 format=3 uid="uid://bnjujh22nqr4a"]
+
+[ext_resource type="Texture2D" uid="uid://diymfwm64gae8" path="res://icon.svg" id="1_uhqqe"]
+
+[node name="TestScene" type="Node2D"]
+
+[node name="Icon" type="Sprite2D" parent="."]
+position = Vector2(209, 145)
+texture = ExtResource("1_uhqqe")
+
+[node name="Icon2" type="Sprite2D" parent="."]
+position = Vector2(11, 9)
+texture = ExtResource("1_uhqqe")