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
36
37
38
39
40
41
42
43
44
|
'''OpenGL extension SGIS.texture_edge_clamp
This module customises the behaviour of the
OpenGL.raw.GL.SGIS.texture_edge_clamp to provide a more
Python-friendly API
Overview (from the spec)
The base OpenGL provides clamping such that the texture coordinates are
limited to exactly the range [0,1]. When a texture coordinate is
clamped using this algorithm, the texture sampling filter straddles the
edge of the texture image, taking 1/2 its sample values from within the
texture image, and the other 1/2 from the texture border. It is
sometimes desirable to clamp a texture without requiring a border, and
without using the constant border color.
This extension defines a new texture clamping algorithm.
CLAMP_TO_EDGE_SGIS clamps texture coordinates at all mipmap levels such
that the texture filter never samples a border texel. When used with a
NEAREST or a LINEAR filter, the color returned when clamping is derived
only from texels at the edge of the texture image. When used with
FILTER4 filters, the filter operations of CLAMP_TO_EDGE_SGIS are defined
but don't result in a nice clamp-to-edge color.
CLAMP_TO_EDGE_SGIS is supported by 1, 2, and 3-dimensional textures
only.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/SGIS/texture_edge_clamp.txt
'''
from OpenGL import platform, constant, arrays
from OpenGL import extensions, wrapper
import ctypes
from OpenGL.raw.GL import _types, _glgets
from OpenGL.raw.GL.SGIS.texture_edge_clamp import *
from OpenGL.raw.GL.SGIS.texture_edge_clamp import _EXTENSION_NAME
def glInitTextureEdgeClampSGIS():
'''Return boolean indicating whether this extension is available'''
from OpenGL import extensions
return extensions.hasGLExtension( _EXTENSION_NAME )
### END AUTOGENERATED SECTION
|
