7caca2f056
Fix LY wait and HALT timing in CGB double speed mode
...
In double speed mode, dmg_sync_hw() halves CPU cycles before adding
to frame_cycles. The timing functions (compile_ly_wait, compile_ly_wait_reg,
compile_halt) compute D2 in PPU-domain units, but only half gets applied
to frame_cycles, causing the target LY to never be reached and an
infinite re-entry loop during game init.
Add effective_double_speed byte to JIT context and emit a runtime check
in all three timing functions to double D2 when double speed is active.
2026-02-06 16:06:36 -08:00
1eb1209097
optimize register usage for write, add patch system
2026-02-03 18:29:48 -06:00
39d9dcca74
Forgot to add other files...
2026-02-01 15:29:19 -08:00
c5fb8064aa
Fix CGB detection: set A=0x11 for CGB mode
2026-02-01 01:12:15 -08:00
14e7b65dde
Remove debug counters and optimize LY calculation
...
- Remove dmg_reads/dmg_writes debug counters that ran on every memory
access, saving 2-4 cycles per read/write operation
- Replace O(n) LY calculation loop with O(1) division-based formula,
eliminating up to 154 iterations for games that poll LY infrequently
2026-02-01 00:58:48 -08:00
3cbc9337f8
Fix stack corruption in CALL/RET/RST and add STOP instruction support
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Major fixes:
- CALL, RET, RST, and their conditional variants now properly check
stack_in_ram before accessing memory via A3. Previously they assumed
A3 was always a valid native pointer, causing memory corruption when
in slow mode (A3 held raw GB SP value like 0xFFFE).
- Fixed initial SP setup to use fast mode with A3 pointing to actual
HRAM memory instead of holding the raw GB SP value.
- STOP instruction now calls runtime handler to check for CGB speed
switch instead of immediately halting. Enables double-speed mode.
- HDMA cancellation: writing to HDMA5 with bit 7=0 while HDMA is active
now cancels the transfer (fixes Pokemon Crystal).
Safety improvements:
- Added src_ptr bounds check to prevent m68k_offsets array overflow
- Added PC validation to reject execution in VRAM/external RAM
- Added PC history ring buffer for crash debugging
Tested: Klax, Link's Awakening DX, Wario Land 3 now boot successfully.
2026-02-01 00:58:48 -08:00
9bb5705759
Add Game Boy Color support
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- New CGB state management (cgb.c/cgb.h)
- VRAM banking (VBK register)
- WRAM banking (SVBK register, banks 1-7)
- Speed switching (KEY1 register)
- HDMA transfers (HDMA1-5 registers)
- CGB palette registers (BCPS/BCPD, OCPS/OCPD)
- CGB rendering (lcd_cgb.c, lcd_mac_cgb.c)
- Tile attributes from VRAM bank 1
- Per-tile palettes, H/V flip, priority
- 8 background and 8 sprite palettes
- RGB555 to Mac indexed color conversion
- JIT initialization sets A=$11 for CGB mode detection
- UI: "Run as GBC" menu option, .gbc file filter
Working: Tetris DX, Pokemon Gold
Known issues: Crystal, SMB Deluxe, LADX hang at boot
2026-02-01 00:57:25 -08:00
2f23570674
fix SP init (fixes random crashes on exit)
2026-01-31 21:56:34 -06:00
77dd744b1e
reset ly_read_cycle (fixes pokemon crystal infinite loop)
2026-01-31 20:44:24 -06:00
806728a708
remove unused cpu struct
2026-01-28 13:56:38 -06:00
ebb343cdbd
support stack in HRAM (fixes DK '94)
2026-01-25 19:03:28 -06:00
6d5ffbf7f7
recover from OOM on banked cache allocation
2026-01-24 23:26:21 -06:00
1cbad8b28f
second round of polish. v1.2.0
2026-01-24 20:30:13 -06:00
8b78a9345b
sync audio with GB execution - still not sure if i like this better
2026-01-24 02:20:26 -06:00
70ff0224cb
convert machine code arrays to gcc inline assembler
2026-01-23 00:22:01 -06:00
0037fae05a
fix instruction caching issue on 68040
2026-01-22 23:16:30 -06:00
d627b7265b
re-add SP range detection, avoid copying lcd pixels twice
2026-01-21 21:20:42 -06:00
230a9c929b
write a README, add screenshots, audio tweaks with band limited square waves
2026-01-17 00:14:05 -06:00
e9000a3c84
rewrite stack for the millionth time
2026-01-15 21:09:57 -06:00
bf46e65f5a
dumb "force draw sprites" that doesn't work
2026-01-15 19:27:44 -06:00
f8e508ecd2
LY wait detection, fix block overflow bug, add new menus, MBC5
2026-01-15 16:46:17 -06:00
14474a0197
use A5/A6 as page table pointers, UI polish
2026-01-15 01:27:50 -06:00
1927fc04db
arena allocator for blocks, remove duplicate blocks by tracking backward branches
2026-01-14 23:48:19 -06:00
fb9c430397
clean up externs, make indentation consistent in jit, add some comments
2026-01-14 17:33:01 -06:00
0ce2ffd60e
simplify cb ops, basic HALT, fast path for dmg_read/write16
2026-01-14 17:06:15 -06:00
74f91d802e
prepare for dmg_read/write16, rename functions, simplify interop
2026-01-13 22:37:04 -06:00
9f91bd7526
add 1x scale, audio refactor and fix wave frequency issue, remove crazy SP detection and always go through dmg_read/write
2026-01-13 21:47:25 -06:00
9abe1c4bb1
remove bogus O
2026-01-13 00:24:59 -06:00
e0e8e5d967
remove timing hacks, add audio menu option, try to measure audio overhead
2026-01-13 00:20:52 -06:00
ba248a1640
remove useless lru
2026-01-12 22:13:16 -06:00
c611c553ca
fix flag bugs (wow that was hard to find), make DIV better, add color icons
2026-01-12 19:24:03 -06:00
74a8f10c25
test audio
2026-01-11 19:12:20 -06:00
8f0100d322
flush instruction cache after patching block... this fixed so many random crashes
2026-01-10 21:06:23 -06:00
6a2ec58fbd
fix "dec h", precompute LCD palette on palette change, make profiling percent based
2026-01-09 19:35:08 -06:00
eab85d0205
optimize ldh
2026-01-08 22:30:28 -06:00
ea687bed84
finish options dialog
2026-01-08 20:28:10 -06:00
a36c1dd72e
inline reads/writes for stuff in paged areas
2026-01-07 20:43:55 -06:00
68937eb3f3
patch blocks to jump directly to next block
2026-01-07 18:53:53 -06:00
bdeb43c0b3
more timing............................
2026-01-05 15:09:39 -06:00
f3864fef08
keep track of cycles per instruction, remove Mac timing hack
2026-01-04 23:30:22 -06:00
8e5db869a5
temp timing instrumentation
2026-01-04 19:27:25 -06:00
5b3ad01b68
move next_pc to d3
2026-01-04 18:11:43 -06:00
698fe41688
more efficient context switch into JIT, remove old compiler files, fix vblank flag bug
2026-01-04 17:45:52 -06:00
a198b4218f
split out debug logging
2026-01-03 15:59:03 -06:00
3d6156fa57
split out jit harness into its own file
2026-01-03 15:49:56 -06:00
c6377b8b3d
remove pointless unity build from compiler version
2026-01-03 14:26:04 -06:00
Tanner Fokkens
Matthew Laux