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
45
46
|
'''OpenGL extension SGI.color_matrix
This module customises the behaviour of the
OpenGL.raw.GL.SGI.color_matrix to provide a more
Python-friendly API
Overview (from the spec)
This extension adds a 4x4 matrix stack to the pixel transfer path. The
matrix operates on RGBA pixel groups, using the equation
C' = MC,
where
|R|
C = |G|
|B|
|A|
and M is the 4x4 matrix on the top of the color matrix stack. After
the matrix multiplication, each resulting color component is scaled
and biased by a programmed amount. Color matrix multiplication follows
convolution (and the scale, and bias that are associated with
convolution.)
The color matrix can be used to reassign and duplicate color components.
It can also be used to implement simple color space conversions.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/SGI/color_matrix.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.SGI.color_matrix import *
from OpenGL.raw.GL.SGI.color_matrix import _EXTENSION_NAME
def glInitColorMatrixSGI():
'''Return boolean indicating whether this extension is available'''
from OpenGL import extensions
return extensions.hasGLExtension( _EXTENSION_NAME )
### END AUTOGENERATED SECTION
|
