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nes emulator in go
im trying to make it somewhat commented so yeah :D
TODO:
emulator base
- [x] cpu passing nestest
- [x] cart package (iNES parser, mapper 0)
system bus (nes package)
- [/] Bus type: 2KB RAM mirrored through $1FFF, PPU regs $2000-$3FFF (mirrored every 8), APU/IO $4000-$4017, cart $4020+ (APU still missing)
- [ ] OAM DMA at $4014 (stalls CPU 513/514 cycles)
- [x] reuse it in nestest_test.go instead of the test-only bus
- [ ] CPU stall hook and proper IRQ/NMI line (polled between instructions) - PPU currently fires NMI straight from Console.Step, see its doc comment
ppu, background
- [x] registers $2000-$2007 and v/t/x/w latch logic
- [x] nametables with mirroring, palettes, buffered $2007 reads (pattern tables go through the mapper already)
- [x] 341 dots x 262 lines timing, 3 dots per CPU cycle, odd-frame skip dot
- [x] vblank flag and edge-triggered NMI, including the $2002 set-dot race window (see ppu/registers.go's readStatus)
- [ ] background shift-register pixel pipeline, PPUMASK clipping
- [ ] 256x240 framebuffer and RGB palette
frontend and input
- [ ] cmd/gones sdl2 gui (veandco/go-sdl2): window, framebuffer texture, one frame per 1/60s, vsync
- [ ] sdl2 audio output (queue or callback)
- [ ] controller $4016/$4017 strobe and shift register, keyboard mapping
ppu, sprites
- [ ] OAM, per-scanline evaluation, 8-sprite limit, 8x8 and 8x16, flip, priority
- [ ] sprite-0 hit
more mappers
- [ ] MMC1 (1), UxROM (2), CNROM (3), AxROM (7)
- [ ] MMC3 (4) with scanline IRQ
- [ ] battery-backed save files
apu
- [ ] pulse x2, triangle, noise, DMC, frame counter, mixer
- [ ] resampling and audio output
accuracy
- [ ] missing unofficial NOPs
- [ ] run accuracycoin and blargg's CPU, PPU, APU and MMC3 test ROMs
polish
- [ ] save states, pause/reset, fullscreen, gamepad
- [ ] headless mode with framebuffer-hash regression tests
- [ ] movie support
- [ ] (maybe) tas tools
testing:
run "go test ./..." to run all test, "go test ./... -v" for verbose
tests/testdata/nestest.nes and nestest.log are by kevin horton (kevtris), included for testing only.
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