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MakeOpenglDrawIn2D

      
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make opengl behave like you are drawing in 2d.

def glEnable2D():
    """ make opengl behave like you are drawing in 2d.
    """
    vPort = glGetIntegerv(GL_VIEWPORT)
 
    glMatrixMode(GL_PROJECTION)
    glPushMatrix()
    glLoadIdentity()
 
    glOrtho(0, vPort[2], 0, vPort[3], -1, 1)
    glMatrixMode(GL_MODELVIEW)
    glPushMatrix()
    glLoadIdentity()
 
 
 
def glDisable2D():
   """ Use when you've finished drawing in 2D.
   """
   glMatrixMode(GL_PROJECTION)
   glPopMatrix()
   glMatrixMode(GL_MODELVIEW)
   glPopMatrix()
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