[GRASS-dev] Re: nvizlib compile error

[Martin Landa]

Hi,

thanks for the hits. I have commited some changes [1].

However I have no access to Mac. Needs some investigation how to make
off-screen rendering working.

Martin

[1] http://trac.osgeo.org/grass/changeset/32068

2008/7/10 Glynn Clements <glynn at gclements.plus.com>:
>
> Michael Barton wrote:
>
>> Are we at a place yet where I can compile and test this on a Mac,
>> given it's location of OpenGL in the agl directory?
>
> The code won't compile on a Mac at present.
>
> AFAICT, it requires at least:
>
>    /* TODO */
> -    rwin->displayId = aglChoosePixelFmt(GDHandle *dev, int ndev, attributeList);
> +    rwin->displayId = aglChoosePixelFmt(NULL, 0, attributeList);
>
> -    rwin->contextId = aglCreateContext(rwin->display, NULL);
> +    rwin->contextId = aglCreateContext(rwin->displayId, NULL);
>
>    /* create win pixmap to render to (same depth as RootWindow) */
> -    rwin->pixmap = NULL; /* TODO */
> +    rwin->pixmap = <no idea what should go here, but it ain't NULL>;
>
> There is some information on AGL at:
>
> [1]     http://www.mesa3d.org/brianp/sig97/agl.txt
> [2]     http://www.mesa3d.org/brianp/sig97/compare.htm
>
> but I don't know how much of that refers to "classic" rather than OSX.
> There's a lot more information in visualization/nviz/src/togl.c, but
> it doesn't include creating off-screen pixmaps.
>
> I also note:
>
> [3]     http://www.iua.upf.es/~ggeiger/redbookhtml/apc.html
>
>        Off-screen Rendering
>
>        To render off-screen, first create an off-screen graphics
>        world in the usual way, and pass the handle into
>        aglCreateAGLPixmap().
>
> Good luck on figuring out what "the usual way" is ;)
>
> A Google search for aglCreateAGLPixmap produces exactly 7 hits; I've
> just posted three of them, and the other 4 seem to be duplicates of
> [1] and [3].
>
> IOW, everything that mentions aglCreateAGLPixmap seems to assume that
> you are already familiar with normal (non-OpenGL) Mac GUI programming.
>
> In any case, it's going to require some amount of trial and error from
> someone with a Mac.
>
> --
> Glynn Clements <glynn at gclements.plus.com>
>



-- 
Martin Landa <landa.martin gmail.com> * http://gama.fsv.cvut.cz/~landa *