Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Fri, 31 Jan 1997 18:57:51 +0000
check your pixel transfer modes etc.
Try different format images on the host.
Have you tried sub texture loading the image to a bound
texture in texture memory and drawing a polygon to the screen?
Again, watch texture memory.
Does the image have to be back on the host?
Cheers,
Angus.
On Jan 31, 11:56am, Steve Baker wrote:
> Subject: glDrawPixels speed.
>
> Is there some trick to getting fast 'glDrawPixels'? I'm
> trying to dump a 640x480 chunk of image data from main
> memory into the frame buffer, using something like:
>
> glDrawPixels ( WIDTH, HEIGHT, GL_RGB, GL_UNSIGNED_BYTE, buff ) ;
>
> On infinite reality (2xRM, R10k CPU's) I'm seeing ~12Mbytes per second
> and on RE2 (2xRM R4400 CPU's) I'm getting ~7Mbytes per second.
>
> I recollect hearing figure nearer 100 to 200Mbytes/sec on the iR - am
> I mistaken - or is there something wrong here?
>
> I get better rates than this on my PC at home (admittedly not when using GL)!
>
>
> Steve Baker 817-619-1361 (Vox-Lab)
> Hughes Training Inc. 817-619-8776 (Vox-Office/Vox-Mail)
> 2200 Arlington Downs Road 817-619-4028 (Fax)
> Arlington, Texas. TX 76005-6171 Steve++at++MrEd.bgm.link.com (eMail)
> http://www.hti.com (external) http://MrEd.bgm.link.com/staff/steve
(intranet)
> http://web2.airmail.net/sjbaker1
(external)
>
> "You can't destroy the Earth - that's where I keep all my stuff!" - The Tick.
>
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>-- End of excerpt from Steve Baker
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