Re: [info-performer] Overlay for HUD

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From: Paolo Farinelli (paolo++at++sgi.com)
Date: 02/04/2004 14:28:39

Hi,

if you decide to render your HUD in a postdraw callback,
you can avoid having to draw the HUD twice (once for each eye)
by drawing into both left and right back buffers simoultaneously.

Use glDrawBuffer(GL_BACK); for this.

Regards,
Paolo

jcasilla wrote:

> Hi all,
>
> I need to draw 2D graphic stuff (HUD) in top of a 3D stereo visual.
> I'm using a Quadro 980XGL, and it appears to support hardware overlay
> planes.
>
> I don't know if using overlay planes is better in terms of performance
> than doing opengl calls in a postdraw callback. I will have to draw
> the HUD once for each eye, and 2D information will be updated in every
> frame. Does anybody know which is the best way to achieve this?
>
> Thanks in advance for any help.
> 

-- 
Paolo Farinelli                                           paolo++at++sgi.com
Member of Technical Staff, OpenGL Performer              1-650-933-1808
Silicon Graphics        1600 Amphitheatre Pkwy, Mountain View, CA 94043

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