add antialiasing setting

scripts/globals/settings.gd

@@ -1,5 +1,7 @@
 extends Node
 
+enum AntiAliasingMode { DISABLED, FXAA, MSAA_2X, MSAA_4X, MSAA_8X, TAA, FSR2, SSAA }
+
 const SETTING_USAGE_FLAG := PROPERTY_USAGE_SCRIPT_VARIABLE | PROPERTY_USAGE_EDITOR
 const CONFIG_PATH := "user://settings.cfg"
 
@@ -46,6 +48,32 @@ const CONFIG_PATH := "user://settings.cfg"
 		max_fps = value
 
 @export_subgroup("Quality")
+@export var antialiasing: AntiAliasingMode = AntiAliasingMode.MSAA_4X:
+	set(value):
+		get_viewport().use_taa = false
+		get_viewport().msaa_3d = Viewport.MSAA_DISABLED
+		get_viewport().screen_space_aa = Viewport.SCREEN_SPACE_AA_DISABLED
+
+		match value:
+			AntiAliasingMode.TAA:
+				get_viewport().use_taa = true
+			AntiAliasingMode.MSAA_2X:
+				get_viewport().msaa_3d = Viewport.MSAA_2X
+			AntiAliasingMode.MSAA_4X:
+				get_viewport().msaa_3d = Viewport.MSAA_4X
+			AntiAliasingMode.MSAA_8X:
+				get_viewport().msaa_3d = Viewport.MSAA_8X
+			AntiAliasingMode.FXAA:
+				get_viewport().screen_space_aa = Viewport.SCREEN_SPACE_AA_FXAA
+			AntiAliasingMode.FSR2:
+				filtering = Viewport.SCALING_3D_MODE_FSR2
+				resolution_scale = 1
+			AntiAliasingMode.SSAA:
+				filtering = Viewport.SCALING_3D_MODE_BILINEAR
+				resolution_scale = 2
+
+		antialiasing = value
+
 @export var resolution_scale: float = 1:
 	set(value):
 		get_viewport().scaling_3d_scale = value