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
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
'''OpenGL extension OES.compressed_paletted_texture
This module customises the behaviour of the
OpenGL.raw.GLES1.OES.compressed_paletted_texture to provide a more
Python-friendly API
Overview (from the spec)
The goal of this extension is to allow direct support of palettized
textures in OpenGL ES.
Palettized textures are implemented in OpenGL ES using the
CompressedTexImage2D call. The definition of the following parameters
"level" and "internalformat" in the CompressedTexImage2D call have
been extended to support paletted textures.
A paletted texture is described by the following data:
palette format
can be R5_G6_B5, RGBA4, RGB5_A1, RGB8, or RGBA8
number of bits to represent texture data
can be 4 bits or 8 bits per texel. The number of bits
also detemine the size of the palette. For 4 bits/texel
the palette size is 16 entries and for 8 bits/texel the
palette size will be 256 entries.
The palette format and bits/texel are encoded in the
"internalformat" parameter.
palette data and texture mip-levels
The palette data followed by all necessary mip levels are
passed in "data" parameter of CompressedTexImage2D.
The size of palette is given by palette format and bits / texel.
A palette format of RGB_565 with 4 bits/texel imply a palette
size of 2 bytes/palette entry * 16 entries = 32 bytes.
The level value is used to indicate how many mip levels
are described. Negative level values are used to define
the number of miplevels described in the "data" component.
A level of zero indicates a single mip-level.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/OES/compressed_paletted_texture.txt
'''
from OpenGL import platform, constant, arrays
from OpenGL import extensions, wrapper
import ctypes
from OpenGL.raw.GLES1 import _types, _glgets
from OpenGL.raw.GLES1.OES.compressed_paletted_texture import *
from OpenGL.raw.GLES1.OES.compressed_paletted_texture import _EXTENSION_NAME
def glInitCompressedPalettedTextureOES():
'''Return boolean indicating whether this extension is available'''
from OpenGL import extensions
return extensions.hasGLExtension( _EXTENSION_NAME )
### END AUTOGENERATED SECTION
|
