byuu says:
Changelog:
- rewrote sprite rendering, grabs first ten sprites, draws them in
revere order of a: X-index, b: OAM appearance order
- simplified tile decoding to use less variables
- added MBC3 emulation (for now, RTC is always enabled)
- STOP can be broken via joypad IF, this may not be correct though (it
may trigger even without P10-13 being modified)
- cleaned up all MBC emulation to use masks instead of ranges
- MBC2 uses 512-byte table now, ignores high 4-bits. Easier this way I guess
- tools menu temporarily has a console tracer enable option
- some other stuff
No real visible improvements :(
byuu says:
Changelog:
- fixed sprite Vflip check
- fixed up window rendering (well, mostly, works great in Megaman II but
not so great in Makaitoushi SaGa)
- added MBC2, MBC5 (already had MBC0, MBC1)
- removed reset, hooked up power cycle and Vsync toggle
- some other stuff
Makaitoushi SaGa locks on the main menu after some graphical glitches on
the title screen, damn.
Shin Megami Tensei - Devichil Black Book locks up immediately, hitting
HALT opcodes all the time, damn again.
Megaman II should be fully playable now.
Contra 3 is really close, but goes crazy on the turtle boss fight.
byuu says:
Added MBC1 emulation, although battery RAM doesn't save or load to disk
yet.
Made up a fake MBC0 which is really just saying 'no MBC', for consistent
handling of all MBCs.
Added bumpers to stop ROM/RAM out of bounds accesses.
Added STAT interrupts for LY coincidence, Vblank and Hblank (not for OAM
access yet, I don't know the timings.)
Fixed timer interrupt [Jonas Quinn]
Made all interrupts call a CPU function instead of just setting a flag
for better control (to allow below addition.)
Added HALT and STOP emulation, the latter permanently locks the Game Boy
for now. The former breaks on interrupts.
Rewrote all the rendering code to suck 50% less, though it's still
absolutely miserable and scanline-based.
Added pixel-level horizontal scrolling to BGs.
Fixed OBJ rendering error that was making them render upside down (I was
flipping to compensate before.)
Added OBJ 8x16 mode.
Added OBJ priority support.
Added window (but it's broken to all hell on Mega Man II.)
byuu says:
314 of 512 opcodes implemented, can execute the first 67,450
instructions of Tetris.
I also added an MMIO bus, ala bsnes, so that I can map and access
individual registers with a single indirection.
byuu says:
Hooked up a scheduler to enter/exit the CPU core wherever I want. Added
basic 4*1024*1024hz clock, and about eleven or so opcodes. Creating the
disassembler as I encounter each new opcode, not skipping ahead to do
all 'like other' opcodes, eg if I add 'dec b', I don't then add 'dec c'
until I encounter it.
The source tarball also included empty obj/ and out/ directories which
git does not support.
byuu says:
Project started, so basically everything is new.
It's basically a rough skeleton that mimics bsnes project structure.
Eventually the src/gameboy folder will be copied into bsnes-official and
used by the chip/supergameboy core.
The middleware layer (supergameboy/interface) will be merged into a new
chip/icd2 folder that will represent direct Super Game Boy emulation in
the future.
At least, if all goes according to plan.
There is a simple GUI that can load ROMs, but do nothing after it. It's
not hooked up to ruby yet.
There is a basic system class and interface to expose the
video/audio/input functions.
There is a basic memory bus that doesn't support any MBCs yet.
There is a CPU skeleton that only handles easy read/write access to the
CPU registers (AF is a really fucked up register.)
The core is not hooked up to libco yet, but I intend for it to be, so
that I can run the CPU + LCD how I like.
If it turns out the LCD+audio is easily enslavable, then I'll probably
drop libco and just run it like a regular emulator, using a thread
wrapper around it in bsnes only. We'll see.
The CPU doesn't actually support any opcodes, and loading a ROM won't
actually execute anything.
Tim Allen