Re: lrectwrite in an overlay plane

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Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Thu, 28 Mar 1996 10:11:46 +0100

Your overlay uses a colourmap (depth varies depending on platform).
Try setting colourmap colours and placing the colourmap indicies into the
array.

Rgds,
Angus.

On Mar 28, 9:23am, Morten Eriksen wrote:
> Subject: lrectwrite in an overlay plane
> Hi,
>
> I'm having some trouble with the gl call 'lrectwrite' in my
> application. Here's the code I use:
>
>
> unsigned long parray[] = {
> 0x80ff00ff,0x80ff00ff,0x80ff00ff,
> 0x80ff00ff,0x80ff00ff,0x80ff00ff,
> 0x80ff00ff,0x80ff00ff,0x80ff00ff,
> };
>
> drawmode(ViewState->overlay);
> lrectwrite(x-1, y-1, x+1, y+1, parray);
> drawmode(NORMALDRAW);
>
>
> Where ViewState->overlay is earlier in the program found with:
>
> ViewState->overlay = (getgdesc(GD_BITS_OVER_SNG_CMODE) ? OVERDRAW :
> (getgdesc(GD_BITS_PUP_SNG_CMODE) ? PUPDRAW : 0));
>
>
> As far as I can understand, this should draw me a square 3x3 rectangle
> in yellow (RGB = 0xff00ff), with center in (x, y). I've tested it on
> three different SGI machines, with different results all over:
>
> On an Indy system with 8 bit gfx: white 3x3 square.
> On an Indigo system with 24 bit Elan gfx: black 3x3 square.
> On an Onyx with RE2 gfx: nothing at all!
>
>
> I've been playing around with different pixmode()-values and
> color-setting calls, but with no luck.. so, what am I doing wrong?
>
> Regards,
> Morten Eriksen
>
>-- End of excerpt from Morten Eriksen

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