# Diagnose possible problems with the shaders of the program
	#
	# Lists to the console inactive uniforms and attributes.
	# These may not be problematic but they can help to debug the program.
	fun diagnose
	do
		if gl_program == null then compile_and_link

		print "# Diagnose {class_name}"
		for k,v in uniforms do
			if not v.is_active then print "* Uniform {v.name} is inactive"
		end
		for k,v in attributes do
			if not v.is_active then print "* Attribute {v.name} is inactive"
		end
	end