Re: [PyOpenGL-Users] gluBuild3DMipmaps

[JoN <jo...@we...>]

Ah, you are another poor fool like me, interested in 3D textures.
Their support is extremely patchy across different drivers (then there is the
_vtc compression issue too!).

Sorry I realize this email isn't particularly helpful but be warned: 3D textures
are another world of pain/can of worms again in terms of getting access to them,
you have another hill to climb!

I'm doing some stuff at the moment that is working, using GLSL shaders and 2D
textures that pretend to be 3D textures (eg. one 512x512 2D texture can contain
64 (that's 8x8 squares) x 64texel-by-64texel squares, so you can have a 3D
texture that is 64 slices deep, with each slice a 64x64 texture).  This turns
out to be very quick if you program your fragment shaders right and use the
built-in stuff (I'm on Nvidia), plus you get the added advantage that 2D
textures and 2D texture _compression_ is fully supported everywhere with no ifs
or buts.

More fud for thot.

Jon


Quoting Andrew Wilson <and...@al...>:

> Hello,
>   Great hack, got it working no problem now.  One side question,
> gluBuild3DMipmaps works without a hitch, but when I call bool(glTexImage3D)
> I get "False" back. glGetString(GL_VERSION) returns 2.0.1 so supposedly
> teximage3d is supported on gl > 1.2.  Am I missing something here?
>   Thanks
>   Andrew
> 
> 
> On 2/9/07, Mike C. Fletcher <mcf...@vr...> wrote:
> >
> > Andrew Wilson wrote:
> > > Hello,
> > >   I found a newer glu version compiled for win32.  Unfortunately winxp
> > > has a file protection scheme that won't allow me to overwrite
> > > glu32.dll with the newer version.  Is there a way to force pyopengl to
> > > use different dll's?
> > There is, though it feels a bit hacky and has AFAIK never been tested.
> > Here's an example where I make the GLU DLL a completely unrelated
> > library (so there will be no GLU functionality at all):
> >
> > >>> import ctypes
> > >>> glu = ctypes.CDLL( '/usr/lib/libFLAC.so' )
> > >>> platform.GLU = glu
> > >>> from OpenGL.GLU import *
> > >>> gluGetString
> > <OpenGL.platform.gluGetString object at 0x2aaaabc82f10>
> > >>> gluGetString( GLU_VERSION )
> > Traceback (most recent call last):
> >   File "<stdin>", line 1, in <module>
> >   File
> > "/var/pylive/src/OpenGL-dev/OpenGL-ctypes/OpenGL/platform/__init__.py",
> > line 186, in __call__
> >     self.__name__, self.__name__,
> > OpenGL.error.NullFunctionError: Attempt to call an undefined function
> > gluGetString, check for bool(gluGetString) before calling
> >
> > (You will need to use WinDLL, not CDLL for win32).  You may want to use
> > OpenGL.platform.ctypesloader.loadLibrary( ctypes.windll,
> > path_to_your_library ) instead of the bald ctypes operations, as older
> > ctypes versions should be supported with that function.
> >
> > Good luck,
> > Mike
> >
> > >
> > > On 2/8/07, *Andrew Wilson* <and...@al...
> > > <mailto:and...@al...>> wrote:
> > >
> > >     Hey Mike,
> > >       You hit the nail on the head, my version of GLU is '1.2.2.0
> > >     <http://1.2.2.0> Microsoft Corporation'. This may be a silly
> > >     question, is there any way to update glu to 1.3 on win32?
> > >       Thanks
> > >       Andrew
> > >
> >
> > --
> > ________________________________________________
> >   Mike C. Fletcher
> >   Designer, VR Plumber, Coder
> >   http://www.vrplumber.com
> >   http://blog.vrplumber.com
> >
> >
> 




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