byuu says:
Changelog:
- WS: added HblankTimer and VblankTimer IRQs; although they don't appear
to have any effect on any games that use them :/
- WS: added sound emulation; works perfectly in some games (eg Riviera);
is completely silent in most games (eg GunPey)
The sound emulation only partially supports the hypervoice (headphone
only) channel. I need to implement the SDMA before it'll actually do
anything useful. I'm a bit confused about how exactly things work. It
looks like the speaker volume shift and clamp only applies to speaker
mode and not headphone mode, which is very weird. Then there's the
software possibility of muting the headphones and/or the speaker.
Preferably, I want to leave the emulator always in headphone mode for
the extra audio channel. If there are games that force-mute the
headphones, but not speakers, then I may need to force headphones back
on but with the hypervoice channel disabled. I guess we'll see how
things go.
Rough guess is probably that the channels default to enabled after the
IPLROM, and games aren't bothering to manually enable them or something.
byuu says:
Changelog:
- WS: fixed bug when IRQs triggered during a rep string instruction
- WS: added sprite attribute caching (per-scanline); absolutely massive
speed-up
- WS: emulated limit of 32 sprites per scanline
- WS: emulated the extended PPU register bit behavior based on the
DISP_CTRL tile bit-depth setting
- WS: added "Rotate" key binding; can be used to flip the WS display
between horizontal and vertical in real-time
The prefix emulation may not be 100% hardware-accurate, but the edge
cases should be extreme enough to not come up in the WS library. No way
to get the emulation 100% down without intensive hardware testing.
trap15 pointed me at a workflow diagram for it, but that diagram is
impossible without a magic internal stack frame that grows with every
IRQ, and can thus grow infinitely large.
The rotation thing isn't exactly the most friendly set-up, but oh well.
I'll see about adding a default rotation setting to manifests, so that
games like GunPey can start in the correct orientation. After that, if
the LCD orientation icon turns out to be reliable, then I'll start using
that. But if there are cases where it's not reliable, then I'll leave it
to manual button presses.
Speaking of icons, I'll need a set of icons to render on the screen.
Going to put them to the top right on vertical orientation, and on the
bottom left for horizontal orientation. Just outside of the video
output, of course.
Overall, WS is getting pretty far along, but still some major bugs in
various games. I really need sound emulation, though. Nobody's going to
use this at all without that.
byuu says:
Changelog:
- WS: fixed lods, scas instructions
- WS: implemented missing GRP4 instructions
- WS: fixed transparency for screen one
- WSC: added color-mode PPU rendering
- WS+WSC: added packed pixel mode support
- WS+WSC: added dummy sound register reads/writes
- SFC: added threading to SuperDisc (it's hanging for right now; need to
clear IRQ on $21e2 writes)
SuperDisc Timer and Sound Check were failing before due to not turning
off IRQs on $21e4 clear, so I'm happy that's fixed now.
Riviera starts now, and displays the first intro screen before crashing.
Huge, huge amounts of corrupted graphics, though. This game's really
making me work for it :(
No color games seem fully playable yet, but a lot of monochrome and
color games are now at least showing more intro screen graphics before
dying.
This build defaults to horizontal orientation, but I left the inputs
bound to vertical orientation. Whoops. I still need to implement
a screen flip key binding.
byuu says:
Changelog:
- icarus: WS/C detects RAM type/size heuristically now
- icarus: WS/C uses ram type=$type instead of $type
- WS: use back color instead of white for backdrop
- WS: fixed sprite count limit; removes all the garbled sprites from
GunPey
- WS: hopefully fixed sprite priority with screen 2
- WS: implemented keypad polling; GunPey is now fully playable
- SNES: added Super Disc expansion port device (doesn't do anything,
just for testing)
Note: WS is hard-coded to vertical orientation right now. But there's
basic code in there for all the horizontal stuff.
byuu says:
Changelog:
- WS: fixed a major CPU bug where I was using the wrong bits for
ModR/M's memory mode
- WS: added grayscale PPU emulation (exceptionally buggy)
GunPey now runs, as long as you add:
eeprom name=save.ram size=0x800
to the manifest after importing with icarus.
Right now, you can't control the game due to missing keypad polling.
There's also a lot of glitchiness with the sprites. Seems like they're
not getting properly cleared sometimes or something.
Also, the PPU emulation is totally unrealistic bullshit. I decode and
evaluate every single tile and sprite on every single pixel of output.
No way in hell the hardware could ever come close to that. The speed's
around 500fps without the insane sprite evaluations, and around 90fps
with it. Obviously, I'll fix this in time.
Nothing else seems to run that I've tried. Not even far enough to
display any output whatsoever. Tried Langrisser Millenium, Rockman
& Forte and Riviera. I really need to update icarus to try and encode
eeprom/sram sizes, because that's going to break a lot of stuff if it's
missing.
byuu says:
Changelog:
- sfc/ppu/sprite updated to use new .bit(s) functions; masked sizes
better; added valid flags instead of using magic numbers
- ws/ppu updates to use new .bit(s) functions
- ws/ppu: added line compare interrupt support
- added ws/eeprom; emulation of WS/WSC internal EEPROM and cartridge
EEPROM (1kbit - 16kbit supported)
- added basic read/write handlers for remaining WS/WSC PPU registers
WS EEPROM emulation is basically a direct copy of trap15's code. Still
some unknown areas in there, but hopefully it's enough to get further
into games that depend on EEPROM support. Note that you'll have to
manually add the eeprom line to the manifest for now, as icarus doesn't
know how to detect EEPROM/sizes yet.
I figured the changes to the SNES PPU sprites would slow it down a tad,
but it actually sped it up. Most of the impact from the integer classes
are gone now.
byuu says:
I refactored my schedulers. Added about ten lines to each scheduler, and
removed about 100 lines of calling into internal state in the scheduler
for the FC,SFC cores and about 30-40 lines for the other cores. All of
its state is now private.
Also reworked all of the entry points to static auto Enter() and auto
main(). Where Enter() handles all the synchronization stuff, and main()
doesn't need the while(true); loop forcing another layer of indentation
everywhere.
Took a few hours to do, but totally worth it. I'm surprised I didn't do
this sooner.
Also updated icarus gmake install rule to copy over the database.
byuu says:
Alright, well interrupts are in. At least Vblank is.
I also fixed a bug in vector() indexing, MoDRM mod!=3&®==6 using SS
instead of DS, opcodes a0-a3 allowing segment override, and added the
"irq_disable" stuff to the relevant opcodes to suppress IRQs after
certain instructions.
But unfortunately ... still no go on Riviera. It's not reading any
unmapped ports, and although it enables Vblank IRQs and they set port
$b4's status bit, the game never sets the IE flag, so no interrupts ever
actually fire. The game does indeed appear to be sitting in a rather
huge loop, which is probably dependent upon some RAM variable being set
from the Vblank IRQ, but I don't know how I'm supposed to be triggering
it.
... I'm really quite stumped here >_>
byuu says:
All 256 instructions implemented fully. Fixed a major bug with
instructions that both read and write to ModRM with displacement.
Riviera now runs into an infinite loop ... possibly crashed, possibly
waiting on interrupts or in to return something. Added a bunch of PPU
settings registers, but nothing's actually rendering with them yet.
byuu says:
Lots of improvements. We're now able to start executing some V30MZ
instructions. 32 of 256 opcodes implemented so far.
I hope this goes without saying, but there's absolutely no point in
loading WS/WSC games right now. You won't see anything until I have the
full CPU and partial PPU implemented.
ROM bank 2 works properly now, the I/O map is 16-bit (address) x 16-bit
(data) as it should be*, and I have a basic disassembler in place
(adding to it as I emulate new opcodes.)
(* I don't know what happens if you access an 8-bit port in 16-bit mode
or vice versa, so for now I'm just treating the handlers as always being
16-bit, and discarding the upper 8-bits when not needed.)
byuu says:
So, this WIP starts work on something new for higan. Obviously, I can't
keep it a secret until it's ready, because I want to continue daily WIP
releases, and of course, solicit feedback as I go along.
Tim Allen