transform_hint.py :  » Game-2D-3D » PyOpenGL » PyOpenGL-3.0.1 » OpenGL » GL » APPLE » Python Open Source

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Python Open Source » Game 2D 3D » PyOpenGL 
PyOpenGL » PyOpenGL 3.0.1 » OpenGL » GL » APPLE » transform_hint.py
'''OpenGL extension APPLE.transform_hint

This module customises the behaviour of the 
OpenGL.raw.GL.APPLE.transform_hint to provide a more 
Python-friendly API

Overview (from thespec import 
  
  The transform_hint extension provides a new target,
  TRANSFORM_HINT_APPLE, for the Hint procedure.  When the
  transform hint is set to FASTEST the GL may choose to 
  implement certain state dependent algebraic simplifications
  in the geometry transformation that affect the sub-pixel
  precision of the transformed vertex coordinates.  
  
  For example, if two polygons are rendered with identical object
  coordinates, different GL state settings, and the transform
  hint set to FASTEST, there is no gaurantee that the resulting 
  window coordinates of the two polygons will be precisely
  identical.  Therefore, precise tests of the window coordinates, 
  such as a depth test setting of EQUAL, should not be used.
  
  If the transform hint is set to NICEST or DONT_CARE, two polygons
  with identical object coordinates will always be transformed
  to identical window coordinates.

The official definition of this extension is available here:
http://www.opengl.org/registry/specs/APPLE/transform_hint.txt
'''
from OpenGL import platform,constants,constant,arrays
from OpenGL import extensions,wrapper
from OpenGL.GL import glget
import ctypes
from OpenGL.raw.GL.APPLE.transform_hint import *
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