Re: [PyOpenGL-Users] glGet issues

[Mike C. F. <mcf...@vr...>]

On 13-02-07 09:29 AM, Tomasz Wesołowski wrote:
> Hello,
>
> I've noticed that this call:
>
> 	out = GL.glGetTexParameteriv(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_SWIZZLE_B)
...
> This is probably because the list of parameter sizes hardcoded in
> glget.h is a bit out-of-date:
>
> 	TEX_PARAMETER_SIZES = {
> 	    simple.GL_TEXTURE_MAG_FILTER: (1,),
> 	    simple.GL_TEXTURE_MIN_FILTER: (1,),
> 	    simple.GL_TEXTURE_WRAP_S: (1,),
> 	    simple.GL_TEXTURE_WRAP_T: (1,),
> 	    simple.GL_TEXTURE_BORDER_COLOR: (4,),
> 	    simple.GL_TEXTURE_PRIORITY: (1,),
> 	    simple.GL_TEXTURE_RESIDENT: (1,)
> 	}
Yes, basically all of the image manipulation code is a hand-coded 
wrapper around the raw operations. What needs to happen is parsing the 
various spec files looking for:

New Tokens

Accepted by the <...> parameter of ... GetTexParameteriv

and generating a line like this:

glget.addGLGetTexParameterConstant(GL_TEXTURE_SWIZZLE_B,(1,))

in the wrapper (currently these are added to the hand-coded wrappers). 
Currently I do those by hand, but that just isn't keeping pace with the 
various extensions (or even core, really). Each of those calls actually 
needs review to see what size the result should be, too.

Lastly, the image wrapping code likely needs to be more robust to be 
able to handle un-declared constants.
> Sadly, I aparrently can't call this function "normally", without the
> ctypes enhancement:
>
> 	out = ctypes.c_int()
> 	GL.glGetTexParameteriv(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_SWIZZLE_B,
> ctypes.byref(out))
If you need the raw operation:

GL.glGetTexParameteriv.wrappedOperation

which is still ctypes, but doesn't have the wrapper code applied.

Hope that helps,
Mike

-- 
________________________________________________
   Mike C. Fletcher
   Designer, VR Plumber, Coder
   http://www.vrplumber.com
   http://blog.vrplumber.com