Hello,

Lots of code is duplicated between the various emulators, and one idea
was to write a "libemu" that would amalgate all of that code.

This is a proposal for such a library; it prunes code from md, nes
snes, gb, gba, and c64.

Attached is a full diff, and a a tar of joygba, the joynes-like script
I used for most games plus starter scripts I used for testing.

Notes:

pros
- removal of lost of duplicated code between emulators
- joystick support for all emulators (except c64)
- (?) added toggling fullspeed emulation when audio is enabled
- (?) dynamic rescaling from x1 to x16 for larger screens;
  removed -2, -3
- profiling: now toggled at runtime, removed -T
- fix for speed up after pausing emulation with audio turned off


cons
- emalloc, as often reproduced in the emulators;
  might be better off in libc or nowhere
- the signed typedefs might be better placed in /$objtype/include/u.h
- another hacky library
- not that emulator specific, could be expanded instead
- clumsy; input bit vectors are semi-arbitrary and adaptation in some
  emulators is fairly bad; worse examples: snes and md
- regkeyfn is not very useful as is
- snes hires and md intla are ignored when scaling
- maybe user programs should never care about scaling, and the library
  should instead do some turbooptimized duff's device on screen flush


questions
- can we merge 2600 even if it's buggy? can't fix remaining bugs myself
  right now, maybe someone else would; many games work fine;
  long-standing project


Thanks!

qwx