gd: added input addon

addons/guide/ui/guide_icon_renderer.gd

@@ -0,0 +1,30 @@
+## Base class for icon renderers. Note that all icon renderers must be tool
+## scripts.
+@tool
+class_name GUIDEIconRenderer
+extends Control
+
+## The priority of this icon renderer. Built-in renderers use priority 0. Built-in
+## fallback renderer uses priority 100. The smaller the number the higher the priority.
+@export var priority:int = 0
+
+## Whether or not this renderer can render an icon for this input.
+func supports(input:GUIDEInput) -> bool:
+	return false
+	
+## Set up the scene so that the given input can be rendered. This will
+## only be called for input where `supports` has returned true.
+func render(input:GUIDEInput) -> void:
+	pass
+ 
+
+## A cache key for the given input. This should be unique for this renderer
+## and the given input. The same input should yield the same cache key for
+## each renderer.
+func cache_key(input:GUIDEInput) -> String:
+	push_error("Custom renderers must override the cache_key function to ensure proper caching.")
+	return "i-forgot-the-cache-key"
+
+func _ready():
+	process_mode = Node.PROCESS_MODE_ALWAYS
+