[BGM Shader] Add a safety check for tweaking framebuffer sizes

test/audio_renderer.gd

@@ -67,6 +67,9 @@ func _draw() -> void:
 		var draw_rows: int = self.render_queue[0][1]
 		rows_drawn += draw_rows
 		if rows_drawn > OUTPUT_HEIGHT:
+			if self.waiting_for_viewport.empty():
+				print('Could not fit %s into %dx%d output framebuffer, it needs %d rows'%[self.render_queue[0][2], OUTPUT_WIDTH, OUTPUT_HEIGHT, draw_rows])
+				self.render_queue.pop_front()
 			break
 
 		# Draw the next ImageTexture