mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Alex Vanderveen
69 lines
2.7 KiB
C
69 lines
2.7 KiB
C
#ifndef PSX_NETPLAY_SNAP_RING_H
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#define PSX_NETPLAY_SNAP_RING_H
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/*
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* Tick-addressable in-memory .pst ring for rollback netplay.
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*
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* Depth defaults to 64 (enough for early soaks; raise toward
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* RNET_RB_SEAL_MAX_SPAN=128 when episodes deepen). Each slot owns a
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* boot_state_save_buffer_raw blob (uncompressed — FPS). save/load call the
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* full-machine serializer; store/peek are for tests / pre-serialized blobs.
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*/
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#include <stddef.h>
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#include <stdint.h>
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#include "cpu_state.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* §58: 64 → 80 — dense tip snaps (PSX_NET_SNAP_DENSE window) occupy up to
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* ~24 extra slots alongside the interval snaps; keep the interval history
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* span (~1024 ticks at iv=16) from shrinking under dense pressure. */
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#define NETPLAY_SNAP_RING_DEFAULT_DEPTH 80u
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typedef struct NetplaySnapRing NetplaySnapRing;
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NetplaySnapRing* netplay_snap_ring_create(uint32_t depth);
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void netplay_snap_ring_destroy(NetplaySnapRing* r);
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void netplay_snap_ring_clear(NetplaySnapRing* r);
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uint32_t netplay_snap_ring_depth(const NetplaySnapRing* r);
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uint32_t netplay_snap_ring_count(const NetplaySnapRing* r);
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int netplay_snap_ring_has(const NetplaySnapRing* r, uint32_t tick);
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/* Serialize live machine into the ring at tick (overwrites same tick). */
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int netplay_snap_ring_save(NetplaySnapRing* r, uint32_t tick,
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const CPUState* cpu, uint32_t bios_checksum,
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uint32_t entry_pc);
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/* Restore machine from the snap at tick. Returns 0 if missing/reject. */
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int netplay_snap_ring_load(NetplaySnapRing* r, uint32_t tick, CPUState* cpu,
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uint32_t bios_checksum, uint32_t entry_pc);
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/* Take ownership of data on success (caller must not free). For tests /
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* pre-serialized blobs. Overwrites an existing entry for the same tick. */
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int netplay_snap_ring_store(NetplaySnapRing* r, uint32_t tick,
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uint8_t* data, size_t size);
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/* Non-owning peek; NULL if missing. */
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const uint8_t* netplay_snap_ring_peek(const NetplaySnapRing* r, uint32_t tick,
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size_t* size_out);
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/* Oldest/newest occupied tick, or 0 if empty (ambiguous with tick 0 — use
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* count() first). */
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/* Invalidate every snapshot with tick > tick (dead-timeline snaps after an
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* abort realign). Returns the number of slots dropped. */
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uint32_t netplay_snap_ring_drop_after(NetplaySnapRing* r, uint32_t tick);
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/* Drop the single snap at tick (dense-window eviction). 1 if dropped. */
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int netplay_snap_ring_drop_tick(NetplaySnapRing* r, uint32_t tick);
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uint32_t netplay_snap_ring_oldest_tick(const NetplaySnapRing* r);
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uint32_t netplay_snap_ring_newest_tick(const NetplaySnapRing* r);
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#ifdef __cplusplus
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}
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#endif
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#endif /* PSX_NETPLAY_SNAP_RING_H */
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