Re: [Tuxnes-devel] Speed?

[Jon N. <jn...@yi...>]

>The renderer is not the fastest thing ever.  Plus you have the overhead
of
>X...  I think it is possible to use DGA with X, if it is not then try
>loading the ggi libraries and playing in DGA mode.  This works well for
me.

I haven't seen an option anywhere for running via DGA. Does it do this
automagically if you're root? I was also under the impression that
MIT-SHM took out a lot of X's overhead. And I've left ggi behind awhile
ago...

>We lose the ability to support the color emphasis and monochrome
>bits, but gain a lot of speed.  These changes, along with some
modifications
>to sprite rendering, have increased my speed from 20 fps to 55.

Sounds cool

>  I'm
>at the point where the actual CPU emulation (not using the dyn-rec
engine)
>uses >50% of the time, so it's worth optimizing that now.

Do you have some profiling code?

>  I may backport
>pixels.h to the x86 version of TuxNES to check on the speedup.

That would be very cool. Heck, I'd like to run on my Dreamcast...

>BTW, TuxNES already has an automatic frame skip.  
>Look in the UpdateDisplay*() functions.

Hmmm. It doesn't seem to do it, then. It seems to render every frame and
wait if necessary.

>Have you tried disabling sound?  It plays jerky if I leave it on...

No difference here.

It's particularly odd how the old renderer is supposedly faster than the
new, but doesn't seem so for me. I guess the renderer itself is faster,
but the overhead in X is greater.

Is anyone else working on speedups in the X renderer?

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