[SDL] display surface for specified amount of time
acnatha at vr.clemson.edu
Sun Sep 1 14:04:00 PDT 2002
Take a look at:
There is alot of eyetracking/human visual system software there. It's
GTK/OpenGL based. But it shouldn't be too bad to port to SDL.
On Fri, 2002-08-30 at 20:13, todd gureckis wrote:
> i am interested in using sdl for collecting human data in experiments on
> vision. i need a way
> to display an image on a computer screen for a specified amount of time
> (in milliseconds with just + or - a few millisecond error) and be
> confident that nowhere in that time will a partial frame be shown on the
> screen (sync to the vertical refresh of the monitor). i also need a way
> to a quickly as possible change the image on the screen after a keypress
> on the keyboard. is SDL well suited for this purpose?
> i think that double buffering and using a SDL_HWSURFACE is the first
> idea and from what i have read the blitsurface command syncs to the
> vertical refresh of the monitor. can the SDL timers work to get me the
> kind of timing accuracy i am discussing here? what is the temporal
> resolution of capturing a keypress and updating the display surface in
> memory for most hardware?
> does anyone know of a way to gauge what these timings are for a
> particular system?
> thanks for any advice,
> SDL mailing list
> SDL at libsdl.org
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