[Atari800-users] Let's make Atari Falcon great again

[Miro K. <mir...@gm...>]

Hi guys,

I've spent some time on the Atari Falcon port, made it compilable &
linkable & runnable in both ASM and C versions here:
https://github.com/mikrosk/atari800/tree/pr-atari

The branch is ready for rebase or merge. If you prefer posting separate
patches here, please do tell.

Despite the popular belief, the m68k counter part wasn't in a particularly
bad shape. There were two main issues with the port:

   - removal of USE_CLOCK which led to usage gettimeofday() function which
   is awfully slow in mintlib (FreeMiNT's libc)
   - usage of gnu as, as the conversion of cpu_m68k.asm was way harder than
   it had seemed so Petr lost his motivation and everything has been put to
   ice for 9 years

So my patches bring everything up to speed. Few comments:

   - performance-wise it's still pretty good; on my CT60@85 MHz I can get
   The Asskicker at 99-100% without sound (strangely the menu part crawls at
   33%!)
   - the asm version helps a bit but only a bit, gain is about 10
   percentage points
   - surprisingly, sound doesn't take that much, about 5-7 percentage points

Work needed (in order of importance):

   - clean up / fix / optimise sound mixer (lot of glitches even if
   performance is right)
   - fix the Atari side of things, exit is anything but clean in many
   scenarios
   - stereo support
   - profiling
   - look at screen drawing (SuperVidel support, maybe look for unnecessary
   redraws, verify non-videl output, ...)

-- 
MiKRO / Mystic Bytes
http://mikro.atari.org