mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Alex Vanderveen
62 lines
2.8 KiB
Markdown
62 lines
2.8 KiB
Markdown
# Building psx-beetle on Linux
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The psx-beetle oracle builds and runs on Linux with the same wire protocol
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as on Windows. Verified 2026-07-02 (Kula World boots to demo gameplay;
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ping/screenshot served over the TCP debug protocol).
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## beetle-psx checkout
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`runtime/src/beetle_libretro.cpp` targets the C++ beetle-psx tree. Upstream
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master has since been converted to plain C (`libretro.cpp` -> `libretro.c`,
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`PS_CPU` class dropped), which no longer compiles against our integration.
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Pin the checkout to the last compatible commit — the same base
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`docs/beetle_wtrace_hook.patch` was generated from:
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```bash
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git clone https://github.com/libretro/beetle-psx-libretro.git beetle-psx
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cd beetle-psx
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git checkout 5759277b # "audit pass" — last C++-tree base we target
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patch -p1 < ../docs/beetle_wtrace_hook.patch
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patch -p1 < ../docs/beetle_sio_trace_hook.patch
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patch -p1 < ../docs/beetle_cdcmd_trace_hook.patch
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# cdcmd re-inserts the wtrace globals + typedefs — drop the duplicate block
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# in libretro.cpp / mednafen/psx/psx.h if the build errors on redefinition.
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# Also needed (not yet in docs/*.patch): rtrace/irq callbacks, guest-cycle
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# accumulator, PS_CDC::PSXRecomp_GetDecodeVolume, cdc/dma irq peeks. Apply
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# from a prior local beetle-psx tree or re-land those hooks by hand.
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```
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`beetle_cdcmd_trace_hook.patch` adds a CD-command trace callback (fires per
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command dispatch in cdc.cpp) exposed as the `cdrom_cmd_dump` / `cdrom_cmd_reset`
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debug commands — used to oracle-diff the Kula World CD read sequence.
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`beetle_sio_trace_hook.patch` adds `FrontIO::SetSIOTraceCallback` (fires per
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completed SIO byte exchange) — an integration hook beetle_libretro.cpp needs
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that predated the committed wtrace patch.
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## Build
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```bash
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# Static lib. On unix the artifact is named mednafen_psx_libretro.so but is
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# an ar archive (STATIC_LINKING=1); stage it under the name cmake expects.
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make platform=unix STATIC_LINKING=1 HAVE_LIGHTREC=0 -j"$(nproc)"
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cp mednafen_psx_libretro.so libmednafen_psx.a
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cd ../runtime
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cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DPSX_RECOMP_UI=OFF -DPSX_DEBUG_TOOLS=ON
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ninja -C build psx-beetle
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# Run (SDL window; use software renderer if GL context is flaky).
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# Beetle looks for lowercase scph5501.bin in the BIOS directory (SHA1
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# 0555C6FA… — SCPH-5501). Symlink or copy next to SCPH1001.BIN.
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# Default debug port is 4380 (override with --port).
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SDL_RENDER_DRIVER=software ./runtime/build/psx-beetle ../bios/SCPH1001.BIN --disc <game.cue> --port 4380
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# Headless (if xvfb is installed):
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# xvfb-run -a ./runtime/build/psx-beetle ../bios/SCPH1001.BIN --disc <game.cue>
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```
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Wire smoke: `{"cmd":"ping"}` → `backend=beetle`. Screenshot via `screenshot`.
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`gpu_frame_dump` is a **native** (psx-runtime) command — Beetle does not
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expose GP0 OT dumps yet; compare visuals via `screenshot` / `vram_peek`.
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