com_ents.c

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#include "quakedef.h"
#include "protocol.h"
 
// (client and server) allocates a new empty database
entityframe_database_t *EntityFrame_AllocDatabase(mempool_t *mempool)
{
    return (entityframe_database_t *)Mem_Alloc(mempool, sizeof(entityframe_database_t));
}
 
// (client and server) frees the database
void EntityFrame_FreeDatabase(entityframe_database_t *d)
{
    Mem_Free(d);
}
 
// (client and server) clears the database to contain no frames (thus delta compression compresses against nothing)
void EntityFrame_ClearDatabase(entityframe_database_t *d)
{
    memset(d, 0, sizeof(*d));
}
 
// (client and server) clears frame, to prepare for adding entities
void EntityFrame_Clear(entity_frame_t *f, vec3_t eye, int framenum)
{
    f->time = 0;
    f->framenum = framenum;
    f->numentities = 0;
    if (eye == NULL)
        VectorClear(f->eye);
    else
        VectorCopy(eye, f->eye);
}
 
// (server and client) removes frames older than 'frame' from database
void EntityFrame_AckFrame(entityframe_database_t *d, int frame)
{
    int i;
    d->ackframenum = frame;
    for (i = 0;i < d->numframes && d->frames[i].framenum < frame;i++);
    // ignore outdated frame acks (out of order packets)
    if (i == 0)
        return;
    d->numframes -= i;
    // if some queue is left, slide it down to beginning of array
    if (d->numframes)
        memmove(&d->frames[0], &d->frames[i], sizeof(d->frames[0]) * d->numframes);
}
 
// (server and client) reads a frame from the database
void EntityFrame_FetchFrame(entityframe_database_t *d, int framenum, entity_frame_t *f)
{
    int i, n;
    EntityFrame_Clear(f, NULL, -1);
    for (i = 0;i < d->numframes && d->frames[i].framenum < framenum;i++);
    if (i < d->numframes && framenum == d->frames[i].framenum)
    {
        f->framenum = framenum;
        f->numentities = d->frames[i].endentity - d->frames[i].firstentity;
        n = MAX_ENTITY_DATABASE - (d->frames[i].firstentity % MAX_ENTITY_DATABASE);
        if (n > f->numentities)
            n = f->numentities;
        memcpy(f->entitydata, d->entitydata + d->frames[i].firstentity % MAX_ENTITY_DATABASE, sizeof(*f->entitydata) * n);
        if (f->numentities > n)
            memcpy(f->entitydata + n, d->entitydata, sizeof(*f->entitydata) * (f->numentities - n));
        VectorCopy(d->eye, f->eye);
    }
}