gd: added input addon

addons/guide/modifiers/guide_modifier_window_relative.gd

@@ -0,0 +1,26 @@
+## Converts the value of the input into window-relative units between 0 and 1.
+## E.g. if a mouse cursor moves half a screen to the right and down, then 
+## this modifier will return (0.5, 0.5).
+@tool
+class_name GUIDEModifierWindowRelative
+extends GUIDEModifier
+
+
+func _modify_input(input:Vector3, delta:float, value_type:GUIDEAction.GUIDEActionValueType) -> Vector3:
+	if not input.is_finite():
+		return Vector3.INF
+		
+	var window = Engine.get_main_loop().get_root()
+	# We want real pixels, so we need to factor in any scaling that the window does.
+	var window_size:Vector2 = window.get_screen_transform().affine_inverse() * Vector2(window.size)
+	return Vector3(input.x / window_size.x, input.y / window_size.y, input.z)
+
+
+func _editor_name() -> String:
+	return "Window relative"
+
+
+func _editor_description() -> String:
+	return "Converts the value of the input into window-relative units between 0 and 1.\n" + \
+			"E.g. if a mouse cursor moves half a screen to the right and down, then \n" + \
+			"this modifier will return (0.5, 0.5)."