mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Alex Vanderveen
97 lines
4.2 KiB
C
97 lines
4.2 KiB
C
#ifndef PSX_SELFCHECK_H
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#define PSX_SELFCHECK_H
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/*
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* Solo rollback resim self-check (PSX_RB_SELFCHECK=1, offline only).
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*
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* Periodically during normal offline play: snapshot the machine at a safe
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* BB edge, keep playing N ticks while recording the per-boundary pad rows
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* the sampler applied to SIO plus the full netplay digest partitions, then
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* rewind to the snapshot and resim the same rows, comparing digests at every
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* boundary. Any live-vs-resim fork is exactly the class of determinism bug
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* that otherwise only surfaces as a doomed netplay episode in a two-peer
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* soak (SIO pace, GTE fold, present-edge PC, v0 restore, ...).
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*
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* Uses the same machinery as netplay rollback: boot_state raw buffer snaps,
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* netplay_state_digest partitions, RB restore recipe (cycle/IRQ resync, SPU
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* CD FIFO reset, NO cdrom_accelerate, light frontend hook). No recomp-net
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* dependency; fully offline, single process.
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*
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* Env:
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* PSX_RB_SELFCHECK=1 enable
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* PSX_RB_SELFCHECK_INTERVAL=N boundaries between windows (default 600)
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* PSX_RB_SELFCHECK_SPAN=N window length in boundaries (default 32)
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* PSX_RB_SELFCHECK_FAULT=1 corrupt one recorded digest per window to
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* prove the comparator/report path
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* PSX_RB_SELFCHECK_PRIME=N throwaway resims before counted passes
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* (default 1, max 4) — clears live-RECORD ambient
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* PSX_RB_SELFCHECK_MASH=1 synthetic fighter-style button spam on live
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* boundaries (IDLE/SAVE_WAIT/RECORD). Recorded
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* rows replay during resim. Headless-safe.
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* PSX_RB_SELFCHECK_MASH_SEED=N xorshift seed (default 0xC0FFEE)
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* PSX_RB_SELFCHECK_MASH_RATE=N % chance to start a new press/release each
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* boundary when not mid-hold (default 75)
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*
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* Verdict = warm resim#2 vs #3 (peer episode path). Cold #1 vs #2 is dig only.
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*/
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct CPUState;
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/* Startup bind (after savestate_configure; needs HLE scheduler for the
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* rewind longjmp). Reads env; no-op unless PSX_RB_SELFCHECK=1. */
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void psx_selfcheck_init(struct CPUState *cpu, uint32_t bios_checksum,
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uint32_t entry_pc);
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int psx_selfcheck_enabled(void);
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/* 1 while a window is open (record/replay/load). Offline GPU present stays
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* immediate — full BB-edge present-defer skews clk/tim between warm peers. */
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int psx_selfcheck_defer_present(void);
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/* 1 while the resim replay is running: skip wall pacer / host audio pump /
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* host CD boost exactly like netplay resim. */
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int psx_selfcheck_resim_active(void);
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/* 1 during replay: main.cpp must skip live pad sampling entirely (the
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* self-check republishes the recorded rows itself). */
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int psx_selfcheck_replay_input(void);
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/* 1 during record or replay: main.cpp must skip the mid-frame low-latency
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* input re-sample so pads stay boundary-latched (netplay tick semantics). */
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int psx_selfcheck_input_locked(void);
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/* Offline pad sampler notes what it applied to SIO this boundary (called
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* from apply_pad_slot_to_sio / apply_input_override_to_sio). */
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void psx_selfcheck_note_pad(int slot, uint16_t buttons, uint8_t lx, uint8_t ly,
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uint8_t rx, uint8_t ry, uint8_t analog);
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/* 1 when mash owns this boundary's P1 pad word (active-low). Latched once
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* per offline vblank so mid-frame resampling sees a stable word. */
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int psx_selfcheck_mash_override(uint16_t *out_buttons);
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/* Once per offline vblank boundary, after pad sampling (main.cpp present
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* body). defer_window!=0 postpones opening a new window (e.g. multitap
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* arming still pending). */
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void psx_selfcheck_finish_frame(int defer_window);
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/* Safe BB-edge poll (beside savestate_poll in interrupts.c): performs the
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* deferred snapshot save. Loads only as a fallback when span-end flush did
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* not run (e.g. headless paths that skip present). Near-free when idle. */
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void psx_selfcheck_poll(struct CPUState *cpu, uint32_t resume_pc);
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/* After present-body C++ RAII: if a window span just ended, rewind+resume
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* immediately at that VBlank boundary (no post-span BB tail). Longjmps. */
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void psx_selfcheck_flush_load(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* PSX_SELFCHECK_H */
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