byuu says:
Changelog:
- processor/lr35902: completed rewrite
I'd appreciate regression testing of the Game Boy and Game Boy Color
emulation between v103r24 and v103r26 (skip r25) if anyone wouldn't
mind.
I fixed up processor/lr35902-legacy to compile and run, so that trace
logs can be created between the two cores to find errors. I'm going to
kill processor/lr35902-legacy with the next WIP release, as well as make
changes to the trace format (add flags externally from AF; much easier
to read them that way), which will make it more difficult to do these
comparisons in the future, hence r26 may prove important later on if we
miss regressions this time.
As for the speed of the new CPU core, not too much to report ... at
least it's not slower :)
Mega Man II: 212.5 to 214.5fps
Shiro no Sho: 191.5 to 191.5fps
Oracle of Ages: 182.5 to 190.5fps
byuu says:
Changelog:
- gb/cpu: force STAT mode to 0 when LCD is disabled (fixes Pokemon
Pinball, etc)
- gb/ppu: when LCD is disabled, require at least one-frame wait to
re-enable, display white during this time
- todo: should step by a scanline at a time: worst-case is an
extra 99% of a frame to enable again
- gba/ppu: cache tilemap lookups and attribute parsing
- it's more accurate because the GBA wouldn't read this for every
pixel
- but unfortunately, this didn't provide any speedup at all ...
sigh
- ruby/audio/alsa: fixed const issue with free()
- ruby/video/cgl: removed `glDisable(GL_ALPHA_TEST)` [deprecated]
- ruby/video/cgl: removed `glEnable(GL_TEXTURE_2D)` [unnecessary as
we use shaders]
- processor/lr35902: started rewrite¹
¹: so, the Game Boy and Game Boy Color cores will be completely
broken for at least the next two or three WIPs.
The old LR35902 was complete garbage, written in early 2011. So I'm
rewriting it to provide a massive cleanup and consistency with other
processor cores, especially the Z80 core.
I've got about 85% of the main instructions implemented, and then I have
to do the CB instructions. The CB instructions are easier because
they're mostly just a small number of opcodes in many small variations,
but it'll still be tedious.
byuu says:
Changelog:
- processor/gsu: minor code cleanup
- processor/hg51b: renamed reg(Read,Write) to register(Read,Write)
- processor/lr35902: minor code cleanup
- processor/spc700: completed code cleanup (sans disassembler)
- no longer uses internal global state inside instructions
- processor/spc700: will no longer hang the emulator if stuck in a WAI
(SLEEP) or STP (STOP) instruction
- processor/spc700: fixed bug in handling of OR1 and AND1 instructions
- processor/z80: minor code cleanup
- sfc/dsp: revert to initializing registers to 0x00; save for
ENDX=random(), FLG=0xe0 [Jonas Quinn]
Major testing of the SNES game library would be appreciated, now that
its CPU cores have all been revised.
We know the DSP registers read back as randomized data ... mostly, but
there are apparently internal latches, which we can't emulate with the
current DSP design. So until we know which registers have separate
internal state that actually *is* initialized, I'm going to play it safe
and not break more games.
Thanks again to Jonas Quinn for the continued research into this issue.
EDIT: that said ... `MD works if((ENDX&0x30) > 0)` is only a 3:4 chance
that the game will work. That seems pretty unlikely that the odds of it
working are that low, given hardware testing by others in the past :/ I
thought if worked if `PITCH != 0` before, which would have been way more
likely.
The two remaining CPU cores that need major cleanup efforts are the
LR35902 and ARM cores. Both are very large, complicated, annoying cores
that will probably be better off as full rewrites from scratch. I don't
think I want to delay v103 in trying to accomplish that, however.
So I think it'll be best to focus on allowing the Mega Drive core to not
lock when processors are frozen waiting on a response from other
processors during a save state operation. Then we should be good for a
new release.
Tim Allen