[uae] Re: New WinUAE
- From: Richard Drummond <evilrich@xxxxxxxxxxxxxx>
- To: uae@xxxxxxxxxxxxx
- Date: Wed, 16 May 2007 21:30:19 -0400
Hi Jochen
On Wednesday 16 May 2007 12:26:20 Jochen Becher wrote:
> The original chip set
> only knew NTSC (and later PAL) so every game was synchronized to that
> VSYNC interrupt and all movements used constant speed of 1, 2 or 4
> pixels per frame (that made games a little bit slower using PAL than
> NTSC). The problem begins if you decide to support a logical frame rate
> that is different from the physical frame rate (e.g. it is impossible to
> play a movie that is encoded for 50 HZ at a VSYNC of 82 Hz without
> flickering or at least some interpolation tricks which reduces
> sharpness).
Indeed. Currently with E-UAE and a platform where VSYNC works, if you don't a
have a frame-rate that's an integer multiple of the Amiga frame-rate (as you
say, 50 Hz for PAL, 60 Hz for NTSC), you get a very jerky, uneven refresh
rate.
> So what we need are two things: E-UAE that uses VSYNC of the graphics
> hardware and a graphics hardware that is compatible to NTSC or PAL. Best
> would be if E-UAE could define the exact timings itself (of course you
> then need to have some monitor that supports NTSC or PAL or you must use
> your TV).
Yes. E-UAE needs to be able to find out what refresh rates your monitor
supports. With SDL, this is not practical - it's not supported in the API
(you could feasibly time how long it takes to do a few dummy buffer flips).
Cheers,
Rich
--
Richard Drummond
Web: http://www.rcdrummond.net/
Mail: mailto:evilrich@xxxxxxxxxxxxxx
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