Internal database of built in shader include files. This object contains shader fragments from Godot's internal shaders. These can be used when access to internal uniform buffers and/or internal functions is required for instance when composing compositor effects or compute shaders. Only fragments for the current rendering device are loaded. Returns the code for the built-in shader fragment. You can also access this in your shader code through [code]#include "filename"[/code]. Returns [code]true[/code] if an include file with this name exists. Returns a list of built-in include files that are currently registered.