OpenGL extension EXT.stencil_wrap
This module customises the behaviour of the
OpenGL.raw.GL.EXT.stencil_wrap to provide a more
Overview (from the spec)
Various algorithms use the stencil buffer to "count" the number of
surfaces that a ray passes through. As the ray passes into an object,
the stencil buffer is incremented. As the ray passes out of an object,
the stencil buffer is decremented.
GL requires that the stencil increment operation clamps to its maximum
value. For algorithms that depend on the difference between the sum
of the increments and the sum of the decrements, clamping causes an
This extension provides an enable for both maximum and minimum wrapping
of stencil values. Instead, the stencil value wraps in both directions.
Two additional stencil operations are specified. These new operations
are similiar to the existing INCR and DECR operations, but they wrap
their result instead of saturating it. This functionality matches
the new stencil operations introduced by DirectX 6.
The official definition of this extension is available here:
|EXTENSION_NAME = 'GL_EXT_stencil_wrap'|
GL_DECR_WRAP_EXT = GL_DECR_WRAP_EXT
GL_INCR_WRAP_EXT = GL_INCR_WRAP_EXT
__file__ = '/home/mcfletch/pylive/OpenGL/GL/EXT/stencil_wrap.pyc'
__name__ = 'OpenGL.GL.EXT.stencil_wrap'
__package__ = 'OpenGL.GL.EXT'