[Mesa-dev] COMPSIZE function in OpenGL XML registry

[Shervin Sharifi]

Thanks Ian.
If I want to implement the actual CompSize function, how should I figure
out the details?

Thanks,
   Shervin

On Wed, Jun 10, 2015 at 2:56 PM, Ian Romanick <idr at freedesktop.org> wrote:

> On 06/10/2015 11:25 AM, Shervin Sharifi wrote:
> > Hi,
> >
> >  This may not be the right forum to ask this, but I didn't know of a
> > better forum, so I thought I can ask here.
> >
> >  I'm new to OpenGL. I am looking at XML registry for OpenGL and there
> > are some parameters with attributes containing a function COMPSIZE (I've
> > pasted an example below).
> >  I tried to find information on what the COMPSIZE function is, where/how
> > it is used, etc, but couldn't find documentation or credible information
> > on the Internet.
> >  Any information or pointer to that would be really helpful.
>
> It's a signal to code generation scripts that the size of the data
> referenced by the "pointer" parameter depends on the values of "type"
> and "stride".  For example, GLX protocol code uses this to know how much
> image data to send to the server for glTexImage2D.
>
> >  Thanks,
> >     Shervin
> >
> >
> >
> > This example is from gl.xml in the OpenGL registry:
> >
> >         <command>
> >             <proto>void <name>glBinormalPointerEXT</name></proto>
> >             <param group="BinormalPointerTypeEXT"><ptype>GLenum</ptype>
> > <name>type</name></param>
> >             <param><ptype>GLsizei</ptype> <name>stride</name></param>
> >             <param len="COMPSIZE(type,stride)">const void
> > *<name>pointer</name></param>
> >         </command>
> >
> >
> > _______________________________________________
> > mesa-dev mailing list
> > mesa-dev at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/mesa-dev
>
>
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