1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
'''OpenGL extension SGIX.vertex_preclip
Overview (from the spec)
Certain graphics subsystems are capable of performing fast
2D viewport or, in some cases, 3D volume "scissoring" operations
within some coordinate range much faster that the host CPU could
re-tesselate clipped primitives.
This extension introduces the notion of an extended rasterizable view
volume that is an expansion of the clip-space view volume. This volume
is the space within which a particular graphics system is much more
efficient at rejecting fragments that lie outside the view volume than
it is at performing strict view volume clipping.
Clip-checking can be turned on or off through the glEnable/glDisable
mechanism, and can be further controlled by using glHint.
The official definition of this extension is available here:
http://oss.sgi.com/projects/ogl-sample/registry/SGIX/vertex_preclip.txt
Automatically generated by the get_gl_extensions script, do not edit!
'''
from OpenGL import platform, constants, constant, arrays
from OpenGL import extensions
from OpenGL.GL import glget
import ctypes
EXTENSION_NAME = 'GL_SGIX_vertex_preclip'
GL_VERTEX_PRECLIP_SGIX = constant.Constant( 'GL_VERTEX_PRECLIP_SGIX', 0x83EE )
GL_VERTEX_PRECLIP_HINT_SGIX = constant.Constant( 'GL_VERTEX_PRECLIP_HINT_SGIX', 0x83EF )
def glInitVertexPreclipSGIX():
'''Return boolean indicating whether this extension is available'''
return extensions.hasGLExtension( EXTENSION_NAME )
|
