code: def reshape(w, h):
      glViewport(0, 0, w, h)
      glMatrixMode(GL_PROJECTION)
      glLoadIdentity()
      glMatrixMode(GL_MODELVIEW)
  
imports: from OpenGL.GL import *
  from OpenGL.GLUT import *
  from OpenGL.raw.GL.VERSION.GL_1_5 import glBufferData
  import pyopencl
label_desc: Use image node_id 3 for calling a global function with example usage: reshape(w, h) without return types