Re: XForms: overlays in XForms and OpenGL

T.C. Zhao (tc_zhao@yahoo.com)
Sat, 17 Apr 1999 05:19:48 -0700 (PDT)

# To subscribers of the xforms list from "T.C. Zhao" <tc_zhao@yahoo.com> :

I am not sure what the problem might be, but you
should be able to get the canvas ID using
fl_ObjWin(canvas).

--- Todd Koumrian <todd@core-dump.stanford.edu> wrote:
> # To subscribers of the xforms list from Todd Koumrian
> <todd@core-dump.stanford.edu> :
>
> Greetings,
>
> I'm trying to use overlays in a XForms and Open-GL program.
>
> I have been successful in setting up and using GL canvases are normal
> drawing to the color buffer, and setting up overlay GL canvases
> directly
> on top of the color buffer canvases. The overlay GL canvases were
> created through XForms by specifying the appropriate attributes which
> would select an overlay visual on my machine. It appears to be
> working,
> although all drawing in the overlay canvas appears either as
> transparent
> (when using color index 0 on my machine - that's normal) or black,
> which
> is the problem I'm having. It seems that no matter what I do when
> trying to set up the color map using the XForms calls, I never seem
> to
> be able to set the color map cells to the colors I want. No matter
> what, all indexes > 0 seem to be black. By the way, on the SGI O2
> I'm
> using, the overlay color map has 8 bits of indexing.
>
> I thought about setting the color map using X calls directly, but if
> I
> create the overlay using XForms routines, I reach a roadblock where I
> need to have the widget ID, and I can't get that from the XForms API
> or
> headers.
>
> Could someone who has had success with overlays in XForms please give
> me
> some advice, or point me to some sample code that will show me the
> way?
>
> Thanks.
>
> Todd Koumrian
>
> --
> Todd Koumrian todd@core-dump.Stanford.EDU
> Dept. of Radiation Oncology Voice: (650) 725-6713
> Stanford University Fax: (650) 498-4015
> Grant Building S-036
>
>
>
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