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https://github.com/RetroPortingToolKit/psxrecomp
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Shokunin
4f76e2eec2
The post-FMV lockstep gate counted a tick as agreed only when sim-1 was already hash-confirmed. A peer digest arrives one RTT after its tick, so the peer running ahead (the host, cross-machine) never saw sim-1 confirmed, reset the streak every tick and logged 'rb DESYNC - FMV lockstep MAX unmatched' after every movie while every digest matched. Each newly confirmed tick past the movie's end now counts once; only a real mismatch resets the streak. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
22 lines
888 B
C
22 lines
888 B
C
/* netplay_fmv_confirm.h - post-movie agreement counting for rollback netplay.
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*
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* After a movie, both peers must agree for RB_FMV_LOCKSTEP_CONFIRM ticks
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* before prediction is unlocked. Agreement is measured in hash-confirmed
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* ticks: each newly confirmed tick past the movie's end counts once, however
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* late its confirmation arrives. A confirmation is always about one RTT
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* behind the tick it confirms, so testing "is sim-1 confirmed yet" every tick
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* never succeeds on the peer that runs ahead. */
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#ifndef PSX_NETPLAY_FMV_CONFIRM_H
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#define PSX_NETPLAY_FMV_CONFIRM_H
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#include <stdint.h>
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/* Confirmed ticks gained when the confirmed frontier moves from `from` (the
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* highest tick already counted, or the movie's end) to `resolved`. */
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static inline uint32_t rb_fmv_confirm_gain(uint32_t from, uint32_t resolved)
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{
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return resolved > from ? resolved - from : 0u;
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}
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#endif
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