code: def initGL():
      global wWidth, wHeight, wName
      glutInit(sys.argv)
      glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA)
      glutInitWindowSize(wWidth, wHeight)
      glutCreateWindow(wName)
      import pycuda.gl.autoinit
  
imports: from OpenGL.GL import *
  from OpenGL.GLUT import *
  from OpenGL.GLU import *
  from OpenGL.GL.ARB.vertex_buffer_object import *
  import numpy, Image
  import sys, time, os
  import pycuda.driver
  import pycuda.gl
  import pycuda
  from pycuda.compiler import SourceModule
label_desc: Use image node_id 4 for calling a global function with example usage: initGL() without return types