docstr: Check which WebGL functions we did not find/use.
docstr_tok: ["Check","which","WebGL","functions","we","did","not","find\/use","."]
code: def check_unused_webgl_funcs(self):
      """Check which WebGL functions we did not find/use."""
      for name in set(self.parser2.function_names).difference(
          self.used_webgl_names
      ):
          print("WARNING: WebGL function %s not in Desktop" % name)
  
imports: from __future__ import annotations
  import os
  import sys
  import headerparser
  from annotations import parse_anotations
  from OpenGL import GL
label_desc: Use image node_id 3 for calling the FunctionCollector obj's underlying member method code with example usage: obj.check_unused_webgl_funcs() without return types