Represents the input shader parameter within the visual shader graph. Gives access to input variables (built-ins) available for the shader. See the shading reference for the list of available built-ins for each shader type (check [code]Tutorials[/code] section for link). $DOCS_URL/tutorials/shaders/shader_reference/index.html Returns a translated name of the current constant in the Godot Shader Language. E.g. [code]"ALBEDO"[/code] if the [member input_name] equal to [code]"albedo"[/code]. One of the several input constants in lower-case style like: "vertex" ([code]VERTEX[/code]) or "point_size" ([code]POINT_SIZE[/code]). Emitted when input is changed via [member input_name].