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 <reiners@xxxxxxxxxx> >Date: Mon, 11 Dec 2000 10:21:32 +0100 (MET) >To: video4linux-list@xxxxxxxxxx >Subject: [V4L] OpenGL Support / Multiple-Input Cards? >Reply-To: video4linux-list@xxxxxxxxxx > > > 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 reiners@xxxxxxxxxx, Dirk.Reiners@xxxxxxx >-- 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. > > > >_______________________________________________ >Video4linux-list mailing list >Video4linux-list@xxxxxxxxxx >https://listman.redhat.com/mailman/listinfo/video4linux-list ------------------------------------------------------------ --== Sent via Deja.com http://www.deja.com/ ==-- Before you buy.
