139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
#ifndef SIM_SNAPSHOT_H
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#define SIM_SNAPSHOT_H
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#include "sim_ent.h"
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#include "sim_client.h"
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/* TODO: Remove this */
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struct space;
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struct sim_snapshot_store {
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b32 valid;
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struct arena arena;
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/* Snapshots sorted by tick (low to high) */
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u64 first_tick;
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u64 last_tick;
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u64 num_ticks;
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struct sim_snapshot *first_free_snapshot;
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/* Tick -> snapshot lookup */
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u64 num_lookup_buckets;
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struct sim_snapshot_lookup_bucket *lookup_buckets;
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};
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struct sim_snapshot {
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b32 valid;
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u64 tick;
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struct sim_snapshot_store *store;
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struct sim_snapshot *next_free;
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struct sim_snapshot *next_in_bucket;
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struct sim_snapshot *prev_in_bucket;
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u64 prev_tick;
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u64 next_tick;
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struct arena arena;
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/* Real time (increases with clock assuming no lag) */
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i64 real_dt_ns;
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i64 real_time_ns;
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/* World time (affected by timescale) */
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f64 world_timescale;
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i64 world_dt_ns;
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i64 world_time_ns;
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/* When was this snapshot received */
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i64 received_at_ns;
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/* If != previous tick's continuity then don't lerp */
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u64 continuity_gen;
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/* The last physics iteration (used for tracking contact lifetime) */
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u64 phys_iteration;
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/* Which client in the client store represents the local host in the original snapshot */
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struct sim_client_handle local_client;
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/* Client lookup */
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struct sim_client_lookup_bucket *client_lookup_buckets;
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u64 num_client_lookup_buckets;
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/* Clients */
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struct arena clients_arena;
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struct sim_client *clients;
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struct sim_client_handle first_free_client;
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u64 num_clients_allocated;
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u64 num_clients_reserved;
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/* Entities */
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struct arena ents_arena;
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struct sim_ent *ents;
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struct sim_ent_handle first_free_ent;
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u64 num_ents_allocated;
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u64 num_ents_reserved;
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};
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/* ========================== *
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* Startup
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* ========================== */
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struct sim_snapshot_startup_receipt { i32 _; };
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struct sim_snapshot_startup_receipt sim_snapshot_startup(void);
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/* ========================== *
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* Store
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* ========================== */
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struct sim_snapshot_store *sim_snapshot_store_alloc(void);
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void sim_snapshot_store_release(struct sim_snapshot_store *store);
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void sim_snapshot_store_release_ticks_in_range(struct sim_snapshot_store *store, u64 start, u64 end);
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/* ========================== *
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* Nil
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* ========================== */
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INLINE struct sim_snapshot *sim_snapshot_nil(void)
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{
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extern READONLY struct sim_snapshot **_g_sim_snapshot_nil;
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return *_g_sim_snapshot_nil;
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}
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INLINE struct sim_snapshot_store *sim_snapshot_store_nil(void)
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{
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extern READONLY struct sim_snapshot_store **_g_sim_snapshot_store_nil;
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return *_g_sim_snapshot_store_nil;
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}
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/* ========================== *
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* Snapshot
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* ========================== */
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struct bitbuff_writer;
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struct bitbuff_reader;
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/* Alloc */
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struct sim_snapshot *sim_snapshot_alloc(struct sim_snapshot_store *store, struct sim_snapshot *src, u64 tick);
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void sim_snapshot_release(struct sim_snapshot *sim_snapshot);
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/* Lookup */
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struct sim_snapshot *sim_snapshot_from_tick(struct sim_snapshot_store *store, u64 tick);
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/* Lerp */
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struct sim_snapshot *sim_snapshot_alloc_from_lerp(struct sim_snapshot_store *store, struct sim_snapshot *ss0, struct sim_snapshot *ss1, f64 blend);
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/* Encode / decode */
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void sim_snapshot_encode(struct bitbuff_writer *bw, struct sim_snapshot *ss0, struct sim_snapshot *ss1, struct sim_client *client);
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void sim_snapshot_decode(struct bitbuff_reader *br, struct sim_snapshot *ss);
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#endif
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