common.qc

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#include "common.qh"
 
#include <common/checkextension.qh>
 
#if defined(CSQC)
    #include <client/items/items.qh>
#elif defined(MENUQC)
#elif defined(SVQC)
    #include <common/weapons/_all.qh>
#endif
 
void WarpZone_Accumulator_Clear(entity acc)
{
    acc.warpzone_transform = '0 0 0';
    acc.warpzone_shift = '0 0 0';
}
void WarpZone_Accumulator_AddTransform(entity acc, vector t, vector s)
{
    vector tr, st;
    tr = AnglesTransform_Multiply(t, acc.warpzone_transform);
    st = AnglesTransform_Multiply_GetPostShift(t, s, acc.warpzone_transform, acc.warpzone_shift);
    acc.warpzone_transform = tr;
    acc.warpzone_shift = st;
}
void WarpZone_Accumulator_Add(entity acc, entity wz)
{
    WarpZone_Accumulator_AddTransform(acc, wz.warpzone_transform, wz.warpzone_shift);
}
void WarpZone_Accumulator_AddInverseTransform(entity acc, vector t, vector s)
{
    vector tt, ss;
    tt = AnglesTransform_Invert(t);
    ss = AnglesTransform_PrePostShift_GetPostShift(s, tt, '0 0 0');
    WarpZone_Accumulator_AddTransform(acc, tt, ss);
    // yes, this probably can be done simpler... but this way is "obvious" :)
}
void WarpZone_Accumulator_AddInverse(entity acc, entity wz)
{
    WarpZone_Accumulator_AddInverseTransform(acc, wz.warpzone_transform, wz.warpzone_shift);
}
 
vector WarpZone_camera_transform(entity this, vector org, vector ang)
{
    vector vf, vr, vu;
    if(this.warpzone_fadestart)
        if(vdist(org - this.origin - 0.5 * (this.mins + this.maxs), >, this.warpzone_fadeend + 400))
            return org;
            // don't transform if zone faded out (plus 400qu safety margin for typical speeds and latencies)
            // unneeded on client, on server this helps a lot
    vf = v_forward;
    vr = v_right;
    vu = v_up;
    org = WarpZone_TransformOrigin(this, org);
    vf = WarpZone_TransformVelocity(this, vf);
    vr = WarpZone_TransformVelocity(this, vr);
    vu = WarpZone_TransformVelocity(this, vu);
    traceline(this.warpzone_targetorigin, org, MOVE_NOMONSTERS, NULL);
    v_forward = vf;
    v_right = vr;
    v_up = vu;
    return org;
}
 
void WarpZone_SetUp(entity e, vector my_org, vector my_ang, vector other_org, vector other_ang)
{
    e.warpzone_transform = AnglesTransform_RightDivide(other_ang, AnglesTransform_TurnDirectionFR(my_ang));
    e.warpzone_shift = AnglesTransform_PrePostShift_GetPostShift(my_org, e.warpzone_transform, other_org);
    e.warpzone_origin = my_org;
    e.warpzone_targetorigin = other_org;
    e.warpzone_angles = my_ang;
    e.warpzone_targetangles = other_ang;
    vector forward, right, up;
    FIXED_MAKE_VECTORS(my_ang, forward, right, up);
    e.warpzone_forward = forward;
    FIXED_MAKE_VECTORS(other_ang, forward, right, up);
    e.warpzone_targetforward = forward;
    setcamera_transform(e, WarpZone_camera_transform);
}
 
vector WarpZone_Camera_camera_transform(entity this, vector org, vector ang)
{
    // a fixed camera view
    if(this.warpzone_fadestart)
        if(vdist(org - this.origin - 0.5 * (this.mins + this.maxs), >, this.warpzone_fadeend + 400))
            return org;
            // don't transform if zone faded out (plus 400qu safety margin for typical speeds and latencies)
            // unneeded on client, on server this helps a lot
    trace_endpos = this.warpzone_origin;
    makevectors(this.warpzone_angles);
    return this.warpzone_origin;
}
 
void WarpZone_Camera_SetUp(entity e, vector my_org, vector my_ang) // we assume that e.oldorigin and e.avelocity point to view origin and direction
{
    e.warpzone_origin = my_org;
    e.warpzone_angles = my_ang;
    setcamera_transform(e, WarpZone_Camera_camera_transform);
}
 
.entity enemy;
 
float WarpZoneLib_BoxTouchesBrush_Recurse(vector mi, vector ma, entity e, entity ig)
{
    float f, s;
    entity se;
 
    tracebox('0 0 0', mi, ma, '0 0 0', MOVE_NOMONSTERS, ig);
#ifdef CSQC
    if (trace_networkentity)
    {
        LOG_TRACE("hit a network ent, cannot continue WarpZoneLib_BoxTouchesBrush");
        // we cannot continue, as a player blocks us...
        // so, abort
        return 0;
    }
#endif
    if (!trace_ent)
        return 0;
    if (trace_ent == e)
        return 1;
 
    se = trace_ent;
    s = se.solid;
    se.solid = SOLID_NOT;
    setorigin(se, se.origin); // unlink
    f = WarpZoneLib_BoxTouchesBrush_Recurse(mi, ma, e, ig);
    se.solid = s;
    setorigin(se, se.origin); // relink
 
    return f;
}
 
float WarpZoneLib_BoxTouchesBrush(vector mi, vector ma, entity e, entity ig)
{
    // bones_was_here: TODO: when findbox_OrFallback() is available, use it to
    // optimise this into a single non-recursive function that only calls tracebox once
 
    float f, s;
 
    if(!e.modelindex || e.warpzone_isboxy)
        return 1;
 
    // work around trigger_hurt on geit3ctf1 not being detected by tracebox
    // bones_was_here: FIXME: WHY do these triggers only have supercontents == 128 ?!
    if (Q3COMPAT_COMMON && ig != world)
        ig.dphitcontentsmask |= 128;
 
    s = e.solid;
    if (e.solid != SOLID_BSP)
    {
        e.solid = SOLID_BSP;
        setorigin(e, e.origin); // update linking
    }
    f = WarpZoneLib_BoxTouchesBrush_Recurse(mi, ma, e, ig);
    if (e.solid != s) // if we needed to change .solid temporarily
    {
        e.solid = s; // restore it
        setorigin(e, e.origin); // update linking
    }
 
    if (Q3COMPAT_COMMON && ig != world)
        ig.dphitcontentsmask &= ~128;
 
    return f;
}
 
entity WarpZone_Find(vector mi, vector ma)
{
    // if we are near any warpzone planes - MOVE AWAY (work around nearclip)
    if(!warpzone_warpzones_exist)
        return NULL;
    IL_EACH(g_warpzones, WarpZoneLib_BoxTouchesBrush(mi, ma, it, NULL),
    {
        return it;
    });
    return NULL;
}
 
void WarpZone_MakeAllSolid()
{
    if(!warpzone_warpzones_exist)
        return;
    IL_EACH(g_warpzones, true,
    {
        it.solid = SOLID_BSP;
    });
}
 
void WarpZone_MakeAllOther()
{
    if(!warpzone_warpzones_exist)
        return;
    IL_EACH(g_warpzones, true,
    {
        it.solid = SOLID_TRIGGER;
    });
}
 
void WarpZone_Trace_InitTransform()
{
    if(!WarpZone_trace_transform)
    {
        WarpZone_trace_transform = new_pure(warpzone_trace_transform);
    }
    WarpZone_Accumulator_Clear(WarpZone_trace_transform);
}
void WarpZone_Trace_AddTransform(entity wz)
{
    WarpZone_Accumulator_Add(WarpZone_trace_transform, wz);
}
 
void WarpZone_TraceBox_ThroughZone(vector org, vector mi, vector ma, vector end, float nomonsters, entity forent, entity zone, WarpZone_trace_callback_t cb)
{
    float nomonsters_adjusted;
    float frac, sol, i;
    float contentshack;
    entity wz;
    vector vf, vr, vu;
 
    WarpZone_trace_forent = forent;
    WarpZone_trace_firstzone = NULL;
    WarpZone_trace_lastzone = NULL;
    WarpZone_Trace_InitTransform();
    if(!warpzone_warpzones_exist)
    {
        if(nomonsters == MOVE_NOTHING)
        {
            trace_endpos = end;
            trace_fraction = 1;
            if(cb)
                cb(org, trace_endpos, end);
            return;
        }
        else
        {
            tracebox(org, mi, ma, end, nomonsters, WarpZone_trace_forent);
            if(cb)
                cb(org, trace_endpos, end);
            return;
        }
    }
 
    vf = v_forward;
    vr = v_right;
    vu = v_up;
 
    switch(nomonsters)
    {
        case MOVE_WORLDONLY:
        case MOVE_NOTHING:
            nomonsters_adjusted = MOVE_NOMONSTERS;
            break;
        default:
            nomonsters_adjusted = nomonsters;
            break;
    }
    if((contentshack = (WarpZone_trace_forent.dphitcontentsmask && !(WarpZone_trace_forent.dphitcontentsmask & DPCONTENTS_SOLID))))
        BITSET_ASSIGN(WarpZone_trace_forent.dphitcontentsmask, DPCONTENTS_SOLID);
 
    // if starting in warpzone, first transform
    wz = WarpZone_Find(org + mi, org + ma);
    if(wz)
    {
        WarpZone_trace_firstzone = wz;
        WarpZone_trace_lastzone = wz;
        if(zone && wz != zone)
        {
            // we are in ANOTHER warpzone. This is bad. Make a zero length trace and return.
            sol = 1;
            trace_fraction = 0;
            trace_endpos = org;
            goto fail;
        }
        WarpZone_Trace_AddTransform(wz);
        org = WarpZone_TransformOrigin(wz, org);
        end = WarpZone_TransformOrigin(wz, end);
    }
    WarpZone_MakeAllSolid();
    sol = -1;
    frac = 0;
    i = 16;
    for (;;)
    {
        if(--i < 1)
        {
            LOG_TRACE("Too many warpzones in sequence, aborting trace.");
            trace_ent = NULL;
            break;
        }
        tracebox(org, mi, ma, end, nomonsters_adjusted, WarpZone_trace_forent);
        if(cb)
            cb(org, trace_endpos, end);
        if(sol < 0)
            sol = trace_startsolid;
 
        frac = trace_fraction = frac + (1 - frac) * trace_fraction;
        if(trace_fraction >= 1)
            break;
        if(trace_ent.classname != "trigger_warpzone")
        {
            if((nomonsters == MOVE_NOTHING) || ((nomonsters == MOVE_WORLDONLY) && trace_ent) || (contentshack && (trace_dphitcontents & WarpZone_trace_forent.dphitcontentsmask) == DPCONTENTS_SOLID))
            {
                // continue the trace, ignoring this hit (we only care for warpzones)
                org = trace_endpos + normalize(end - org);
                continue;
                // we cannot do an inverted trace here, as we do care for further warpzones inside that "solid" to be found
                // otherwise, players could block entrances that way
            }
            break;
        }
        /*if(trace_ent == wz)
        {
            // FIXME can this check be removed? Do we really need it?
            LOG_TRACE("I transformed into the same zone again, wtf, aborting the trace");
            trace_ent = NULL;
            break;
        }*/
        wz = trace_ent;
        if(!WarpZone_trace_firstzone)
            WarpZone_trace_firstzone = wz;
        WarpZone_trace_lastzone = wz;
        if(zone && wz != zone)
            break;
        WarpZone_Trace_AddTransform(wz);
        // we hit a warpzone... so, let's perform the trace after the warp again
        org = WarpZone_TransformOrigin(wz, trace_endpos);
        end = WarpZone_TransformOrigin(wz, end);
 
        // we got warped, so let's step back a bit
        tracebox(org, mi, ma, org + normalize(org - end) * 32, nomonsters_adjusted, WarpZone_trace_forent);
        org = trace_endpos;
    }
    WarpZone_MakeAllOther();
LABEL(fail)
    if(contentshack)
        BITCLR_ASSIGN(WarpZone_trace_forent.dphitcontentsmask, DPCONTENTS_SOLID);
    trace_startsolid = sol;
    v_forward = vf;
    v_right = vr;
    v_up = vu;
}
 
void WarpZone_TraceBox(vector org, vector mi, vector ma, vector end, float nomonsters, entity forent)
{
    WarpZone_TraceBox_ThroughZone(org, mi, ma, end, nomonsters, forent, NULL, WarpZone_trace_callback_t_null);
}
 
void WarpZone_TraceLine(vector org, vector end, float nomonsters, entity forent)
{
    WarpZone_TraceBox(org, '0 0 0', '0 0 0', end, nomonsters, forent);
}
 
void WarpZone_TraceToss_ThroughZone(entity e, entity forent, entity zone, WarpZone_trace_callback_t cb)
{
    float g, dt, i;
    vector vf, vr, vu, v0, o0;
    entity wz;
 
    o0 = e.origin;
    v0 = e.velocity;
    g = cvar("sv_gravity") * e.gravity;
 
    WarpZone_trace_forent = forent;
    WarpZone_trace_firstzone = NULL;
    WarpZone_trace_lastzone = NULL;
    WarpZone_Trace_InitTransform();
    WarpZone_tracetoss_time = 0;
    if(!warpzone_warpzones_exist)
    {
        tracetoss(e, WarpZone_trace_forent);
        if(cb)
            cb(e.origin, trace_endpos, trace_endpos);
        dt = vlen(e.origin - o0) / vlen(e.velocity);
        WarpZone_tracetoss_time += dt;
        e.velocity_z -= dt * g;
        WarpZone_tracetoss_velocity = e.velocity;
        e.velocity = v0;
        return;
    }
 
    vf = v_forward;
    vr = v_right;
    vu = v_up;
 
    // if starting in warpzone, first transform
    wz = WarpZone_Find(e.origin + e.mins, e.origin + e.maxs);
    if(wz)
    {
        WarpZone_trace_firstzone = wz;
        WarpZone_trace_lastzone = wz;
        if(zone && wz != zone)
        {
            // we are in ANOTHER warpzone. This is bad. Make a zero length trace and return.
 
            WarpZone_tracetoss_time = 0;
            trace_endpos = o0;
            goto fail;
        }
        WarpZone_Trace_AddTransform(wz);
        vector org = WarpZone_TransformOrigin(wz, e.origin);
        setorigin(e, org);
        e.velocity = WarpZone_TransformVelocity(wz, e.velocity);
    }
    WarpZone_MakeAllSolid();
    i = 16;
    for (;;)
    {
        if(--i < 1)
        {
            LOG_TRACE("Too many warpzones in sequence, aborting trace.");
            trace_ent = NULL;
            break;
        }
        tracetoss(e, WarpZone_trace_forent);
        if(cb)
            cb(e.origin, trace_endpos, trace_endpos);
        dt = vlen(trace_endpos - e.origin) / vlen(e.velocity);
        WarpZone_tracetoss_time += dt;
        e.origin = trace_endpos;
        e.velocity_z -= dt * g;
        if(trace_fraction >= 1)
            break;
        if(trace_ent.classname != "trigger_warpzone")
            break;
        if(trace_ent == wz)
        {
            // FIXME can this check be removed? Do we really need it?
            LOG_TRACE("I transformed into the same zone again, wtf, aborting the trace");
            trace_ent = NULL;
            break;
        }
        wz = trace_ent;
        if(!WarpZone_trace_firstzone)
            WarpZone_trace_firstzone = wz;
        WarpZone_trace_lastzone = wz;
        if(zone && wz != zone)
            break;
        WarpZone_Trace_AddTransform(wz);
        // we hit a warpzone... so, let's perform the trace after the warp again
        e.origin = WarpZone_TransformOrigin(wz, e.origin);
        e.velocity = WarpZone_TransformVelocity(wz, e.velocity);
 
        // we got warped, so let's step back a bit
        e.velocity = -e.velocity;
        tracetoss(e, WarpZone_trace_forent);
        dt = vlen(trace_endpos - e.origin) / vlen(e.velocity);
        WarpZone_tracetoss_time -= dt;
        e.origin = trace_endpos;
        e.velocity = -e.velocity;
    }
    WarpZone_MakeAllOther();
LABEL(fail)
    WarpZone_tracetoss_velocity = e.velocity;
    v_forward = vf;
    v_right = vr;
    v_up = vu;
    // restore old entity data (caller just uses trace_endpos, WarpZone_tracetoss_velocity and the transform)
    e.velocity = v0;
    e.origin = o0;
}
 
void WarpZone_TraceToss(entity e, entity forent)
{
    WarpZone_TraceToss_ThroughZone(e, forent, NULL, WarpZone_trace_callback_t_null);
}
 
entity WarpZone_TrailParticles_trace_callback_own;
float WarpZone_TrailParticles_trace_callback_eff;
void WarpZone_TrailParticles_trace_callback(vector from, vector endpos, vector to)
{
    __trailparticles(WarpZone_TrailParticles_trace_callback_own, WarpZone_TrailParticles_trace_callback_eff, from, endpos);
}
 
void WarpZone_TrailParticles(entity own, float eff, vector org, vector end)
{
    WarpZone_TrailParticles_trace_callback_own = own;
    WarpZone_TrailParticles_trace_callback_eff = eff;
    WarpZone_TraceBox_ThroughZone(org, '0 0 0', '0 0 0', end, MOVE_NOMONSTERS, NULL, NULL, WarpZone_TrailParticles_trace_callback);
}
 
#ifdef CSQC
float WarpZone_TrailParticles_trace_callback_f;
float WarpZone_TrailParticles_trace_callback_flags;
void WarpZone_TrailParticles_WithMultiplier_trace_callback(vector from, vector endpos, vector to)
{
    boxparticles(WarpZone_TrailParticles_trace_callback_eff, WarpZone_TrailParticles_trace_callback_own, from, endpos, WarpZone_TrailParticles_trace_callback_own.velocity, WarpZone_TrailParticles_trace_callback_own.velocity, WarpZone_TrailParticles_trace_callback_f, WarpZone_TrailParticles_trace_callback_flags);
}
 
void WarpZone_TrailParticles_WithMultiplier(entity own, float eff, vector org, vector end, float f, int boxflags)
{
    WarpZone_TrailParticles_trace_callback_own = own;
    WarpZone_TrailParticles_trace_callback_eff = eff;
    WarpZone_TrailParticles_trace_callback_f = f;
    WarpZone_TrailParticles_trace_callback_flags = boxflags | PARTICLES_DRAWASTRAIL;
    WarpZone_TraceBox_ThroughZone(org, '0 0 0', '0 0 0', end, MOVE_NOMONSTERS, NULL, NULL, WarpZone_TrailParticles_WithMultiplier_trace_callback);
}
#endif
 
float WarpZone_PlaneDist(entity wz, vector v)
{
    return (v - wz.warpzone_origin) * wz.warpzone_forward;
}
 
float WarpZone_TargetPlaneDist(entity wz, vector v)
{
    return (v - wz.warpzone_targetorigin) * wz.warpzone_targetforward;
}
 
vector WarpZone_TransformOrigin(entity wz, vector v)
{
    return wz.warpzone_shift + AnglesTransform_Apply(wz.warpzone_transform, v);
}
 
vector WarpZone_TransformVelocity(entity wz, vector v)
{
    return AnglesTransform_Apply(wz.warpzone_transform, v);
}
 
vector WarpZone_TransformAngles(entity wz, vector v)
{
    return AnglesTransform_ApplyToAngles(wz.warpzone_transform, v);
}
 
vector WarpZone_TransformVAngles(entity wz, vector ang)
{
#ifdef KEEP_ROLL
    float roll;
    roll = ang.z;
    ang.z = 0;
#endif
 
    ang = AnglesTransform_ApplyToVAngles(wz.warpzone_transform, ang);
 
#ifdef KEEP_ROLL
    ang = AnglesTransform_Normalize(ang, true);
    ang = AnglesTransform_CancelRoll(ang);
    ang.z = roll;
#else
    ang = AnglesTransform_Normalize(ang, false);
#endif
 
    return ang;
}
 
vector WarpZone_UnTransformOrigin(entity wz, vector v)
{
    return AnglesTransform_Apply(AnglesTransform_Invert(wz.warpzone_transform), v - wz.warpzone_shift);
}
 
vector WarpZone_UnTransformVelocity(entity wz, vector v)
{
    return AnglesTransform_Apply(AnglesTransform_Invert(wz.warpzone_transform), v);
}
 
vector WarpZone_UnTransformAngles(entity wz, vector v)
{
    return AnglesTransform_ApplyToAngles(AnglesTransform_Invert(wz.warpzone_transform), v);
}
 
vector WarpZone_UnTransformVAngles(entity wz, vector ang)
{
#ifdef KEEP_ROLL
    float roll;
    roll = ang.z;
    ang.z = 0;
#endif
 
    ang = AnglesTransform_ApplyToVAngles(AnglesTransform_Invert(wz.warpzone_transform), ang);
 
#ifdef KEEP_ROLL
    ang = AnglesTransform_Normalize(ang, true);
    ang = AnglesTransform_CancelRoll(ang);
    ang.z = roll;
#else
    ang = AnglesTransform_Normalize(ang, false);
#endif
 
    return ang;
}
 
vector WarpZoneLib_NearestPointOnBox(vector mi, vector ma, vector org)
{
    vector nearest;
    nearest.x = bound(mi.x, org.x, ma.x);
    nearest.y = bound(mi.y, org.y, ma.y);
    nearest.z = bound(mi.z, org.z, ma.z);
    return nearest;
}
 
// blacklist of entities that WarpZone_FindRadius doesn't care about
bool WarpZoneLib_BadEntity(entity e)
{
    if (is_pure(e)) return true;
    string s = e.classname;
 
    switch(s)
    {
        case "weaponentity":
        case "exteriorweaponentity":
        case "sprite_waypoint":
        case "waypoint":
        case "spawnfunc":
        case "weaponchild":
        case "chatbubbleentity":
        case "buff_model":
        //case "net_linked": // actually some real entities are linked without classname, fail
        case "":
            return true;
    }
 
    if (startsWith(s, "target_")) return true;
 
    if (startsWith(s, "info_")) return true;
 
    return false;
}
 
.float WarpZone_findradius_hit;
.entity WarpZone_findradius_next;
void WarpZone_FindRadius_Recurse(
    vector org,
    float rad,
    vector org0,
    vector transform,
    vector shift,
    bool needlineofsight)
{
    if (rad <= 0) return;
    entity wz = NULL;
    FOREACH_ENTITY_RADIUS(org, rad, !WarpZoneLib_BadEntity(it), {
        vector p = WarpZoneLib_NearestPointOnBox(it.origin + it.mins, it.origin + it.maxs, org0);
        if (needlineofsight)
        {
            traceline(org, p, MOVE_NOMONSTERS, it);
            if (trace_fraction < 1) continue;
        }
        if (!it.WarpZone_findradius_hit || vlen2(it.WarpZone_findradius_dist) > vlen2(org0 - p))
        {
            it.WarpZone_findradius_nearest = p;
            it.WarpZone_findradius_dist = org0 - p;
            it.WarpZone_findradius_findorigin = org;
            it.WarpZone_findradius_findradius = rad;
            if (it.classname == "warpzone_refsys")
            {
                // ignore, especially: do not overwrite the refsys parameters
            }
            else if (it.classname == "trigger_warpzone")
            {
                it.WarpZone_findradius_next = wz;
                wz = it;
                it.WarpZone_findradius_hit = 1;
                it.enemy.WarpZone_findradius_dist = '0 0 0'; // we don't want to go through this zone ever again
                it.enemy.WarpZone_findradius_hit = 1;
            }
            else
            {
                it.warpzone_transform = transform;
                it.warpzone_shift = shift;
                it.WarpZone_findradius_hit = 1;
            }
        }
    });
    for(entity e = wz; e; e = e.WarpZone_findradius_next)
    {
        if (WarpZoneLib_BadEntity(e)) continue;
 
        vector org0_new = WarpZone_TransformOrigin(e, org);
        traceline(e.warpzone_targetorigin, org0_new, MOVE_NOMONSTERS, e);
        vector org_new = trace_endpos;
 
        vector transform_new = AnglesTransform_Multiply(e.warpzone_transform, transform);
        vector shift_new = AnglesTransform_Multiply_GetPostShift(e.warpzone_transform, e.warpzone_shift, transform, shift);
        WarpZone_FindRadius_Recurse(
            org_new,
            bound(0, rad - vlen(org_new - org0_new), rad - 8),
            org0_new,
            transform_new, shift_new,
            needlineofsight);
        e.WarpZone_findradius_hit = 0;
        e.enemy.WarpZone_findradius_hit = 0;
    }
}
entity WarpZone_FindRadius(vector org, float rad, bool needlineofsight)
{
    // FIXME: why can't we do this? (sometimes finds nothing, breaking explosions)
    // if (!warpzone_warpzones_exist && !needlineofsight) return findradius(org, rad);
    WarpZone_FindRadius_Recurse(org, rad, org, '0 0 0', '0 0 0', needlineofsight);
    entity list_first = findchainfloat(WarpZone_findradius_hit, 1);
    FOREACH_LIST(list, chain, true, it.WarpZone_findradius_hit = 0);
    return list_first;
}
 
.entity WarpZone_refsys;
void WarpZone_RefSys_GC(entity this)
{
    // garbage collect unused reference systems
    this.nextthink = time + 1;
    if(this.owner.WarpZone_refsys != this)
        delete(this);
}
void WarpZone_RefSys_CheckCreate(entity me)
{
    if(me.WarpZone_refsys.owner != me)
    {
        me.WarpZone_refsys = new(warpzone_refsys);
        me.WarpZone_refsys.owner = me;
        setthink(me.WarpZone_refsys, WarpZone_RefSys_GC);
        me.WarpZone_refsys.nextthink = time + 1;
        WarpZone_Accumulator_Clear(me.WarpZone_refsys);
    }
}
void WarpZone_RefSys_Clear(entity me)
{
    if(me.WarpZone_refsys)
    {
        delete(me.WarpZone_refsys);
        me.WarpZone_refsys = NULL;
    }
}
void WarpZone_RefSys_AddTransform(entity me, vector t, vector s)
{
    if(t != '0 0 0' || s != '0 0 0')
    {
        WarpZone_RefSys_CheckCreate(me);
        WarpZone_Accumulator_AddTransform(me.WarpZone_refsys, t, s);
    }
}
void WarpZone_RefSys_Add(entity me, entity wz)
{
    WarpZone_RefSys_AddTransform(me, wz.warpzone_transform, wz.warpzone_shift);
}
void WarpZone_RefSys_AddInverseTransform(entity me, vector t, vector s)
{
    if(t != '0 0 0' || s != '0 0 0')
    {
        WarpZone_RefSys_CheckCreate(me);
        WarpZone_Accumulator_AddInverseTransform(me.WarpZone_refsys, t, s);
    }
}
void WarpZone_RefSys_AddInverse(entity me, entity wz)
{
    WarpZone_RefSys_AddInverseTransform(me, wz.warpzone_transform, wz.warpzone_shift);
}
.vector WarpZone_refsys_incremental_shift;
.vector WarpZone_refsys_incremental_transform;
void WarpZone_RefSys_AddIncrementally(entity me, entity ref)
{
    //vector t, s;
    if(me.WarpZone_refsys_incremental_transform == ref.WarpZone_refsys.warpzone_transform)
    if(me.WarpZone_refsys_incremental_shift == ref.WarpZone_refsys.warpzone_shift)
        return;
    WarpZone_Accumulator_AddInverseTransform(me.WarpZone_refsys, me.WarpZone_refsys_incremental_transform, me.WarpZone_refsys_incremental_shift);
    WarpZone_Accumulator_Add(me.WarpZone_refsys, ref.WarpZone_refsys);
    me.WarpZone_refsys_incremental_shift = ref.WarpZone_refsys.warpzone_shift;
    me.WarpZone_refsys_incremental_transform = ref.WarpZone_refsys.warpzone_transform;
}
void WarpZone_RefSys_BeginAddingIncrementally(entity me, entity ref)
{
    me.WarpZone_refsys_incremental_shift = ref.WarpZone_refsys.warpzone_shift;
    me.WarpZone_refsys_incremental_transform = ref.WarpZone_refsys.warpzone_transform;
}
vector WarpZone_RefSys_TransformOrigin(entity from, entity to, vector org)
{
    if(from.WarpZone_refsys)
        org = WarpZone_UnTransformOrigin(from.WarpZone_refsys, org);
    if(to.WarpZone_refsys)
        org = WarpZone_TransformOrigin(to.WarpZone_refsys, org);
    return org;
}
vector WarpZone_RefSys_TransformVelocity(entity from, entity to, vector vel)
{
    if(from.WarpZone_refsys)
        vel = WarpZone_UnTransformVelocity(from.WarpZone_refsys, vel);
    if(to.WarpZone_refsys)
        vel = WarpZone_TransformVelocity(to.WarpZone_refsys, vel);
    return vel;
}
vector WarpZone_RefSys_TransformAngles(entity from, entity to, vector ang)
{
    if(from.WarpZone_refsys)
        ang = WarpZone_UnTransformAngles(from.WarpZone_refsys, ang);
    if(to.WarpZone_refsys)
        ang = WarpZone_TransformAngles(to.WarpZone_refsys, ang);
    return ang;
}
vector WarpZone_RefSys_TransformVAngles(entity from, entity to, vector ang)
{
    if(from.WarpZone_refsys)
        ang = WarpZone_UnTransformVAngles(from.WarpZone_refsys, ang);
    if(to.WarpZone_refsys)
        ang = WarpZone_TransformVAngles(to.WarpZone_refsys, ang);
    return ang;
}
void WarpZone_RefSys_Copy(entity me, entity from)
{
    if(from.WarpZone_refsys)
    {
        WarpZone_RefSys_CheckCreate(me);
        me.WarpZone_refsys.warpzone_shift = from.WarpZone_refsys.warpzone_shift;
        me.WarpZone_refsys.warpzone_transform = from.WarpZone_refsys.warpzone_transform;
    }
    else
        WarpZone_RefSys_Clear(me);
}
entity WarpZone_RefSys_SpawnSameRefSys(entity me)
{
    entity e = spawn();
    WarpZone_RefSys_Copy(e, me);
    return e;
}
 
bool WarpZoneLib_ExactTrigger_Touch(entity this, entity toucher, bool touchfunc)
{
    vector emin = toucher.absmin, emax = toucher.absmax;
    if (!Q3COMPAT_COMMON)
    {
        // Xonotic and Nexuiz maps assume triggers will be activated by adjacent players
        // prior to sv_legacy_bbox_expand 0 DP always did this for SVQC and never for CSQC
        emin -= '1 1 1';
        emax += '1 1 1';
    }
 
    // if called from a touch func, we can assume the boxes do overlap
    if (!touchfunc && !boxesoverlap(emin, emax, this.absmin, this.absmax)) // quick
        return false;
 
    return WarpZoneLib_BoxTouchesBrush(emin, emax, this, toucher); // accurate
}
 
 
void WarpZoneLib_MoveOutOfSolid_Expand(entity e, vector by)
{
    const float eps = 0.0625;
    tracebox(e.origin, e.mins - '1 1 1' * eps, e.maxs + '1 1 1' * eps, e.origin + by, MOVE_WORLDONLY, e);
    if (trace_startsolid)
        return;
    if (trace_fraction < 1)
    {
        // hit something
        // adjust origin in the other direction...
        setorigin(e, e.origin - by * (1 - trace_fraction));
    }
}
 
int WarpZoneLib_MoveOutOfSolid(entity e)
{
    vector o = e.origin;
    traceline(o, o, MOVE_WORLDONLY, e);
    if (trace_startsolid)
        return 0; // too stuck, giving up
 
    tracebox(o, e.mins, e.maxs, o, MOVE_WORLDONLY, e);
    if (!trace_startsolid)
        return -1; // wasn't stuck
 
    vector m0 = e.mins;
    vector m1 = e.maxs;
    e.mins = '0 0 0';
    e.maxs = '0 0 0';
    WarpZoneLib_MoveOutOfSolid_Expand(e, eX * m0.x); e.mins_x = m0.x;
    WarpZoneLib_MoveOutOfSolid_Expand(e, eX * m1.x); e.maxs_x = m1.x;
    WarpZoneLib_MoveOutOfSolid_Expand(e, eY * m0.y); e.mins_y = m0.y;
    WarpZoneLib_MoveOutOfSolid_Expand(e, eY * m1.y); e.maxs_y = m1.y;
    WarpZoneLib_MoveOutOfSolid_Expand(e, eZ * m0.z); e.mins_z = m0.z;
    WarpZoneLib_MoveOutOfSolid_Expand(e, eZ * m1.z); e.maxs_z = m1.z;
    setorigin(e, e.origin);
 
    tracebox(e.origin, e.mins, e.maxs, e.origin, MOVE_WORLDONLY, e);
    if (trace_startsolid)
    {
        setorigin(e, o);
        return 0; // can't fix
    }
 
    return 1; // was stuck but is fixed now
}