> interleaved frames. The visual quality would be questionable, but it
> would surely be easier to code and run faster than faking phosphor
> persistence, and for this I think would certainly be less
> headache-inducing than flicker.
I don't think faking phosphor persistance for a single frame is difficult at
all.
Keep your last frame rendered (not drawn) frame in a buffer.
Render your new frame. Merge with the last rendered frame buffer by adding
10% of that buffer's RGB values and checking for overflow on each RGB
component. That's the frame you DISPLAY. Your rendered frame (before the
merge) is then copied to the last rendered frame buffer - or better yet, the
last rendered frame buffer pointer points to the most recent rendered frame.
That soulution would require 2 rendered frame buffers and on actual draw
buffer.
That's all I'm after, and hey, pretty simple.
Cheers
A
----- Original Message -----
From: "Erik Mooney" <erik@xxxxxxxxxx>
To: <stella@xxxxxxxxxxx>
Sent: Sunday, January 19, 2003 6:50 AM
Subject: Re: [stella] Emulation suggestion
> >Just an idea for emulation authors (stella, Z26...):
> >
> >Perhaps we could have a simulation of phosphour persistance? That is,
each
> >frame is merged with a faint version of the previous frame... that way we
> >could more easily see what things might look like on a real-TV. Would
stop
> >me getting epilepsy during development of Fu Kung!
> >
> >Seriously, though.... doesn't sound like a hard ask. Does anyone else
think
> >this might be of use?
>
> It was also suggested long ago that an emulator could handle flicker with
> a venetian-blinds effect. Draw one frame on every other scanline (every
> Atari scanline; every other VGA scanline), then the next frame on the
> interleaved frames. The visual quality would be questionable, but it
> would surely be easier to code and run faster than faking phosphor
> persistence, and for this I think would certainly be less
> headache-inducing than flicker.
>
> (If one of the emulators supports this already, ignore me; I haven't been
> keeping up to date on them. :) )
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