OpenGL extension DFX.multisample
This module customises the behaviour of the
OpenGL.raw.GL.DFX.multisample to provide a more
Overview (from the spec)
This extension provides a mechanism to antialias all GL primitives:
points, lines, polygons, bitmaps, and images. The technique is to
sample all primitives multiple times at each pixel. The color sample
values are resolved to a single, displayable color each time a pixel
is updated, so the antialiasing appears to be automatic at the
application level. Because each sample includes depth and stencil
information, the depth and stencil functions perform equivalently to
the single-sample mode.
An additional buffer, called the multisample buffer, is added to the
framebuffer. Pixel sample values, including color, depth, and
stencil values, are stored in this buffer. When the framebuffer
includes a multisample buffer, it does not also include separate
depth or stencil buffers, even if the multisample buffer does not
store depth or stencil values. Color buffers (left/right,
front/back, and aux) do coexist with the multisample buffer,
Multisample antialiasing is most valuable for rendering polygons,
because it requires no sorting for hidden surface elimination, and
it correctly handles adjacent polygons, object silhouettes, and even
intersecting polygons. If only points or lines are being rendered,
the "smooth" antialiasing mechanism provided by the base GL may
result in a higher quality image.
This extension is a subset of SGIS_multisample. It differs in these
* Fragment alpha values are not affected by the fragment sample mask
* The sample locations may or may not be fixed. Thus, there is no
support for rendering the scene multiple times with different
* Fragment masks are not computed for images or for bitmasks.
Because of these differences a new extension was created. However,
it is not expected that this extension will co-exist with
SGIS_multisample. Because of this and the fact that there are only
32 push/pop bits the MULTISAMPLE_BIT_SGIS state value is the same as
The official definition of this extension is available here:
|EXTENSION_NAME = 'GL_DFX_multisample'|
GL_MULTISAMPLE_3DFX = GL_MULTISAMPLE_3DFX
GL_MULTISAMPLE_BIT_3DFX = GL_MULTISAMPLE_BIT_3DFX
GL_SAMPLES_3DFX = GL_SAMPLES_3DFX
GL_SAMPLE_BUFFERS_3DFX = GL_SAMPLE_BUFFERS_3DFX
__file__ = '/home/mcfletch/pylive/OpenGL/GL/DFX/multisample.pyc'
__name__ = 'OpenGL.GL.DFX.multisample'
__package__ = 'OpenGL.GL.DFX'