On a modern PC, this is no problem at all.
We are actually doing this with a 1920 x 1080 x 32-bit bitmap, at 60 FPS, on
a 2-year old PC
You can easily test your GPU <-> CPU bandwidth using this tool:
http://sourceforge.net/projects/gpubench
On Fri, Sep 17, 2010 at 7:53 PM, Lie Ryan
On 07/30/10 03:37, Nick Bowler wrote:
On 2010-07-29 11:30 -0600, Luke Palmer wrote:
If you are trying to redraw in realtime, eg. 30 FPS or so, I don't think you're going to be able to. There is just not enough GPU bandwidth (and probably not enough CPU).
Updating an 800x600 texture at 30fps on a somewhat modern system is absolutely *not* a problem.
It depends. Updating 800x600 screen at 24-bit color 30 times per second requires 800*600*24*30 = 345600000 bytes/s = 329 MB/s which is larger than the size of typical Video Memory, and the first version of PCI Express (introduced 2003) is only 250 MB/s/lane.
While the bandwidth and Video Memory size is sufficient to transfer 329MB/s, it is quite near to the limit, especially if you have another programs running, which may cause some resource contention or if you used some memory-heavy techniques like double buffering.
You're probably quite safe if you have PCI Express version 2, have over 1GB RAM, and a good Video Card. You're probably quite screwed if your VGA uses a Shared Memory Architecture (i.e. it uses RAM for video memory, this easily causes resource contention).
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