True many OpenGL drivers are poorly optimized for blitting with glDrawPixels. Try
using glTexSubImage2D instead; e.g. create a simple GL_QUAD and apply the video image
as a texture map. Since many PC cards are designed for 3D gaming, we've found that
texture mapping is often better optimized than 2D blits.
>From: Dirk Reiners <[EMAIL PROTECTED]>
>Date: Mon, 11 Dec 2000 10:21:32 +0100 (MET)
>To: [EMAIL PROTECTED]
>Subject: [V4L] OpenGL Support / Multiple-Input Cards?
>Reply-To: [EMAIL PROTECTED]
>
>
> Hello Everybody,
>
>we're just getting into Linux and Video (been using sgi so far). We're
>doing image analysis for Augmented Reality and so we have some probably
>not-so-common problems.
>
>We need to add 3D graphics to the video image coming from a standard
>camera, using OpenGL. Thus an opaque window showing video doesn't help us,
>we need the video to be in an OpenGL-compatible window. The easiest way to
>do that is to get the video into main mem and copy it to the screen from
>there. As we need the video image in main mem to analyse it anyway that's
>not a big problem, but most OpenGL drivers for Linux are very badly
>optimized for pixel blits.
>
>Does anybody have experience which cards can copy to main mem at all, and
>which can do it fast? Is there a way to copy video directly to an OpenGL
>window? Any hints which OpenGL cards work best for this?
>
>The second problem is multiple inputs. For stereo applications we need two
>images, sometimes a third from above for tracking. Are there any cards out
>there with multiple inputs and linux drivers?
>
>Thanks for any hints
>
> Dirk
>
>--
>--
>-- Dirk Reiners [EMAIL PROTECTED], [EMAIL PROTECTED]
>-- OpenSG Forum http://www.opensg.org
>-- Rundeturmstrasse 6 http://www.igd.fhg.de/~reiners
>-- D-64283 Darmstadt All standard disclaimers apply.
>-- Truth is stranger than fiction because fiction has to make sense.
>
>
>
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