Re: Querying OpenGL for Compressed Texture formats

Sorry I forgot to say, I've tried with glGetString() and it gives an 'invalid
enum' error, hence the glGetInteger() instead.

Jon


Quoting JoN <[email protected]>:

> 
> Hi,
> 
> I'm trying to create a GL reporter in PyOpenGL to tell me what my OpenGL
> install
> can do.  I'm particularly interested in compressed textures.
> 
> I'm on Fedora Core 3 (yes yes I know, I got it to work but I'll upgrade to 5
> or
> 6 someday soon) and running via GlX - though I am testing my code in parallel
> at
> home under Win32 as well.  So far so good.
> 
> The following is odd, or I am missing something, or both.
> 
> If I do the following:
> 
> print "NUM_COMPRESSED_TEXTURE_FORMATS: " +
> str(glGetInteger(GL_NUM_COMPRESSED_TEXTURE_FORMATS_ARB))
> 
> I get an integer back (on the i915 chipset I tested on its 2), fair enough.
> 
> 
> But when I run this:
> 
>    
>
comptexfmtlist=glGetInteger(OpenGL.GL.ARB.texture_compression.GL_COMPRESSED_TEXTURE_FORMATS_ARB)
> print "COMPRESSED_TEXTURE_FORMATS:  " + str(comptexfmtlist)
> 
> 
> comptexfmtlist comes back as a list of integers, not strings.  Strange.
> Of course what I really want to get is the identifier strings, like for
> example:
> COMPRESSED_RGB_S3TC_DXT1_EXT
> COMPRESSED_RGBA_S3TC_DXT3_EXT
> COMPRESSED_RGBA_S3TC_DXT5_EXT
> 
> etc....
> 
> I've found some constants by those names defined under site-packages in
> OpenGL/GL/EXT/texture_compression_s3tc.py
> OpenGL/GL/_3DFX/texture_compression_FXT1.py
> 
> etc....
> 
> -but no actual strings.
> 
> So I guess my question is - how best to use those integers that come back ?
> Or are the strings hiding somewhere I can get them ?  Or should I just query
> each format individually for its existence (somehow) ? eg using glewpy
> (somehow) ?
> 
> Any enlightenment appreciated.
> 
> 
> The imports I have are:
> from OpenGL.GL import *
> from OpenGL.GLUT import *
> from OpenGL.GLU import *
> import OpenGL.GL.ARB.texture_compression
> from glew import *
> 
> import time
> import struct
> import sys
> from operator import *
> from Image import *
> 
> 
> Jon
> 
> 
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