tracing.qc

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#include "tracing.qh"

#include <common/constants.qh>
#include <common/deathtypes/all.qh>
#include <common/effects/all.qh>
#include <common/net_linked.qh>
#include <common/state.qh>
#include <common/util.qh>
#include <common/weapons/_all.qh>
#include <common/wepent.qh>
#include <lib/warpzone/common.qh>
#include <server/antilag.qh>
#include <server/damage.qh>
#include <server/main.qh>
#include <server/mutators/_mod.qh>
#include <server/weapons/accuracy.qh>
#include <server/weapons/common.qh>
#include <server/weapons/hitplot.qh>
#include <server/weapons/weaponsystem.qh>

// this function calculates w_shotorg and w_shotdir based on the weapon model
// offset, trueaim and antilag, and won't put w_shotorg inside a wall.
// make sure you call makevectors first (FIXME?)
void W_SetupShot_Dir_ProjectileSize_Range(entity ent, .entity weaponentity, vector s_forward, vector mi, vector ma, float antilag, float recoil, Sound snd, float chan, float maxdamage, float range, int deathtype)
{
    TC(Sound, snd);
    float nudge = 1; // added to traceline target and subtracted from result  TOOD(divVerent): do we still need this? Doesn't the engine do this now for us?
    float oldsolid = ent.dphitcontentsmask;
    Weapon wep = DEATH_WEAPONOF(deathtype);
    if(!IS_CLIENT(ent))
        antilag = false; // no antilag for non-clients!
    if (IS_PLAYER(ent) && (wep.spawnflags & WEP_FLAG_PENETRATEWALLS))
    {
        // This is the reason rifle, MG, OKMG and other fireBullet weapons don't hit the crosshair when shooting at walls.
        // This is intentional, otherwise if you stand too close to a (glass) wall and attempt to shoot an enemy through it,
        // trueaim will cause the shot to hit the wall exactly but then miss the enemy (unless shooting from eye/center).
        // TODO for fireBullet, find how far the shot will penetrate and aim at that
        //      for fireRailgunbullet, find the farthest target and aim at that
        //      this will avoid issues when another player is passing in front of you when you shoot
        //      (currently such a shot will hit him but then miss the original target)
        ent.dphitcontentsmask = DPCONTENTS_BODY | DPCONTENTS_CORPSE;
    }
    else
        ent.dphitcontentsmask = DPCONTENTS_SOLID | DPCONTENTS_BODY | DPCONTENTS_CORPSE;
    if(antilag)
        WarpZone_traceline_antilag(NULL, ent.origin + ent.view_ofs, ent.origin + ent.view_ofs + s_forward * range, MOVE_NORMAL, ent, ANTILAG_LATENCY(ent));
        // passing NULL, because we do NOT want it to touch dphitcontentsmask
    else
        WarpZone_TraceLine(ent.origin + ent.view_ofs, ent.origin + ent.view_ofs + s_forward * range, MOVE_NOMONSTERS, ent);
    ent.dphitcontentsmask = DPCONTENTS_SOLID | DPCONTENTS_BODY | DPCONTENTS_CORPSE;

    vector forward, right, up;
    forward = v_forward;
    right = v_right;
    up = v_up;
    w_shotend = WarpZone_UnTransformOrigin(WarpZone_trace_transform, trace_endpos); // warpzone support
    v_forward = forward;
    v_right = right;
    v_up = up;

    // un-adjust trueaim if shotend is too close
    if(vdist(w_shotend - (ent.origin + ent.view_ofs), <, autocvar_g_trueaim_minrange))
        w_shotend = ent.origin + ent.view_ofs + s_forward * autocvar_g_trueaim_minrange;

    // track max damage
    if (IS_PLAYER(ent) && accuracy_canbegooddamage(ent))
        accuracy_add(ent, wep, maxdamage, 0);

    if(IS_PLAYER(ent))
        W_HitPlotAnalysis(ent, wep, forward, right, up);

    vector md = ent.(weaponentity).movedir;
    vector vecs = ((md.x > 0) ? md : '0 0 0');

    vector dv = right * -vecs.y + up * vecs.z;
    w_shotorg = ent.origin + ent.view_ofs;
    if(antilag)
    {
        if(CS(ent).antilag_debug)
            tracebox_antilag(ent, w_shotorg, mi, ma, w_shotorg + dv, MOVE_NORMAL, ent, CS(ent).antilag_debug);
        else
            tracebox_antilag(ent, w_shotorg, mi, ma, w_shotorg + dv, MOVE_NORMAL, ent, ANTILAG_LATENCY(ent));
    }
    else
        tracebox(w_shotorg, mi, ma, w_shotorg + dv, MOVE_NORMAL, ent);
    w_shotorg = trace_endpos;

    // now move the shotorg forward as much as requested if possible
    if(antilag)
    {
        if(CS(ent).antilag_debug)
            tracebox_antilag(ent, w_shotorg, mi, ma, w_shotorg + forward * (vecs.x + nudge), MOVE_NORMAL, ent, CS(ent).antilag_debug);
        else
            tracebox_antilag(ent, w_shotorg, mi, ma, w_shotorg + forward * (vecs.x + nudge), MOVE_NORMAL, ent, ANTILAG_LATENCY(ent));
    }
    else
        tracebox(w_shotorg, mi, ma, w_shotorg + forward * (vecs.x + nudge), MOVE_NORMAL, ent);
    w_shotorg = trace_endpos - forward * nudge;
    // calculate the shotdir from the chosen shotorg
    if(W_DualWielding(ent))
        w_shotdir = s_forward;
    else
        w_shotdir = normalize(w_shotend - w_shotorg);

    //vector prevdir = w_shotdir;
    //vector prevorg = w_shotorg;
    //vector prevend = w_shotend;

    if (antilag)
    if (!CS_CVAR(ent).cvar_cl_noantilag)
    {
        if (autocvar_g_antilag == 1) // switch to "ghost" if not hitting original
        {
            traceline(w_shotorg, w_shotorg + w_shotdir * range, MOVE_NORMAL, ent);
            if (!trace_ent.takedamage)
            {
                traceline_antilag_force (ent, w_shotorg, w_shotorg + w_shotdir * range, MOVE_NORMAL, ent, ANTILAG_LATENCY(ent));
                if (trace_ent.takedamage && IS_PLAYER(trace_ent))
                {
                    entity e;
                    e = trace_ent;
                    traceline(w_shotorg, e.origin, MOVE_NORMAL, ent);
                    if(trace_ent == e)
                        w_shotdir = normalize(trace_ent.origin - w_shotorg);
                }
            }
        }
        else if(autocvar_g_antilag == 3) // client side hitscan
        {
            // this part MUST use prydon cursor
            if (CS(ent).cursor_trace_ent)                 // client was aiming at someone
            if (CS(ent).cursor_trace_ent != ent)         // just to make sure
            if (CS(ent).cursor_trace_ent.takedamage)      // and that person is killable
            if (IS_PLAYER(CS(ent).cursor_trace_ent)) // and actually a player
            {
                // verify that the shot would miss without antilag
                // (avoids an issue where guns would always shoot at their origin)
                traceline(w_shotorg, w_shotorg + w_shotdir * range, MOVE_NORMAL, ent);
                if (!trace_ent.takedamage)
                {
                    // verify that the shot would hit if altered
                    traceline(w_shotorg, CS(ent).cursor_trace_ent.origin, MOVE_NORMAL, ent);
                    if (trace_ent == CS(ent).cursor_trace_ent)
                        w_shotdir = normalize(CS(ent).cursor_trace_ent.origin - w_shotorg);
                    else
                        LOG_INFO("antilag fail");
                }
            }
        }
    }

    ent.dphitcontentsmask = oldsolid; // restore solid type (generally SOLID_SLIDEBOX)

    if (!autocvar_g_norecoil)
        ent.punchangle_x = recoil * -1;

    if (snd != SND_Null) {
        sound(ent, chan, snd, (W_DualWielding(ent) ? VOL_BASE * 0.7 : VOL_BASE), ATTN_NORM);
        W_PlayStrengthSound(ent);
    }

    // nudge w_shotend so a trace to w_shotend hits
    w_shotend = w_shotend + normalize(w_shotend - w_shotorg) * nudge;
    //if(w_shotend != prevend) { printf("SERVER: shotEND differs: %s - %s\n", vtos(w_shotend), vtos(prevend)); }
    //if(w_shotorg != prevorg) { printf("SERVER: shotORG differs: %s - %s\n", vtos(w_shotorg), vtos(prevorg)); }
    //if(w_shotdir != prevdir) { printf("SERVER: shotDIR differs: %s - %s\n", vtos(w_shotdir), vtos(prevdir)); }
}

vector W_CalculateProjectileVelocity(entity actor, vector pvelocity, vector mvelocity, float forceAbsolute)
{
    vector mdirection;
    float mspeed;
    vector outvelocity;

    mvelocity = mvelocity * W_WeaponSpeedFactor(actor);

    mdirection = normalize(mvelocity);
    mspeed = vlen(mvelocity);

    outvelocity = get_shotvelocity(pvelocity, mdirection, mspeed, (forceAbsolute ? 0 : autocvar_g_projectiles_newton_style), autocvar_g_projectiles_newton_style_2_minfactor, autocvar_g_projectiles_newton_style_2_maxfactor);

    return outvelocity;
}

void W_SetupProjVelocity_Explicit(entity proj, vector dir, vector upDir, float pSpeed, float pUpSpeed, float pZSpeed, float spread, float forceAbsolute)
{
    if(proj.owner == NULL)
        error("Unowned missile");

    dir = dir + upDir * (pUpSpeed / pSpeed);
    dir.z += pZSpeed / pSpeed;
    pSpeed *= vlen(dir);
    dir = normalize(dir);

    #if 0
    if(autocvar_g_projectiles_spread_style != mspercallsstyle)
    {
        mspercallsum = mspercallcount = 0;
        mspercallsstyle = autocvar_g_projectiles_spread_style;
    }
    mspercallsum -= gettime(GETTIME_HIRES);
    #endif

    dir = W_CalculateSpread(dir, spread, autocvar_g_weaponspreadfactor, autocvar_g_projectiles_spread_style);

    #if 0
    mspercallsum += gettime(GETTIME_HIRES);
    mspercallcount += 1;
    LOG_INFO("avg: ", ftos(mspercallcount / mspercallsum), " per sec");
    #endif

    proj.velocity = W_CalculateProjectileVelocity(proj.owner, proj.owner.velocity, pSpeed * dir, forceAbsolute);
}


// ====================
//  Ballistics Tracing
// ====================

bool Headshot(entity targ, entity ent, vector start, vector end)
{
    if(!IS_PLAYER(targ) || IS_DEAD(targ) || STAT(FROZEN, targ) || !targ.takedamage)
        return false;
    vector org = targ.origin; // antilag is already taken into consideration //antilag_takebackorigin(targ, CS(targ), time - ANTILAG_LATENCY(ent));
    vector headmins = org + '0.6 0 0' * targ.mins_x + '0 0.6 0' * targ.mins_y + '0 0 1' * (1.3 * targ.view_ofs_z - 0.3 * targ.maxs_z);
    vector headmaxs = org + '0.6 0 0' * targ.maxs_x + '0 0.6 0' * targ.maxs_y + '0 0 1' * targ.maxs_z;

    return trace_hits_box(start, end, headmins, headmaxs);
}

void FireRailgunBullet (entity this, .entity weaponentity, vector start, vector end, float bdamage, bool headshot_notify, float bforce, float mindist, float maxdist, float halflifedist, float forcehalflifedist, int deathtype)
{
    vector dir = normalize(end - start);
    vector force = dir * bforce;

    // go a little bit into the wall because we need to hit this wall later
    end = end + dir;

    float totaldmg = 0;
    bool headshot = false; // indicates that one of the targets hit was a headshot

    // trace multiple times until we hit a wall, each obstacle will be made
    // non-solid so we can hit the next, while doing this we spawn effects and
    // note down which entities were hit so we can damage them later
    entity o = this;
    while (1)
    {
        if(CS(this).antilag_debug)
            WarpZone_traceline_antilag (this, start, end, false, o, CS(this).antilag_debug);
        else
            WarpZone_traceline_antilag (this, start, end, false, o, ANTILAG_LATENCY(this));
        if(o && WarpZone_trace_firstzone)
        {
            o = NULL;
            continue;
        }

        if(trace_ent.solid == SOLID_BSP || trace_ent.solid == SOLID_SLIDEBOX)
            Damage_DamageInfo(trace_endpos, bdamage, 0, 0, force, deathtype, trace_ent.species, this);

        // if it is NULL we can't hurt it so stop now
        if (trace_ent == NULL || trace_fraction == 1)
            break;

        if(headshot_notify && !headshot && Headshot(trace_ent, this, start, end))
            headshot = true;

        // make the entity non-solid so we can hit the next one
        IL_PUSH(g_railgunhit, trace_ent);
        trace_ent.railgunhit = true;
        trace_ent.railgunhitloc = end;
        trace_ent.railgunhitsolidbackup = trace_ent.solid;
        trace_ent.railgundistance = vlen(WarpZone_UnTransformOrigin(WarpZone_trace_transform, trace_endpos) - start);
        trace_ent.railgunforce = WarpZone_TransformVelocity(WarpZone_trace_transform, force);

        // stop if this is a wall
        if (trace_ent.solid == SOLID_BSP)
            break;

        // make the entity non-solid
        trace_ent.solid = SOLID_NOT;
    }

    vector endpoint = trace_endpos;
    entity endent = trace_ent;
    float endq3surfaceflags = trace_dphitq3surfaceflags;

    // find all the entities the railgun hit and restore their solid state
    IL_EACH(g_railgunhit, it.railgunhit,
    {
        it.solid = it.railgunhitsolidbackup;
    });

    // Find all players the beam passed close by (even those hit)
    float length = vlen(endpoint - start);
    entity pseudoprojectile = NULL;
    FOREACH_CLIENT(IS_REAL_CLIENT(it) && it != this, {
        // not when spectating the shooter
        if (IS_SPEC(it) && it.enemy == this) continue;

        // nearest point on the beam
        vector beampos = start + dir * bound(0, (it.origin - start) * dir, length);

        if(!pseudoprojectile)
            pseudoprojectile = new(pseudoprojectile); // we need this so the sound uses the "entchannel4" volume

        msg_entity = it;
        // we want this to be very loud when close but fall off quickly -> using max base volume and high attenuation
        soundtoat(MSG_ONE, pseudoprojectile, beampos, CH_SHOTS, SND(NEXWHOOSH_RANDOM()), VOL_BASEVOICE, ATTEN_IDLE, 0);
    });
    if(pseudoprojectile)
        delete(pseudoprojectile);

    // find all the entities the railgun hit and hurt them
    IL_EACH(g_railgunhit, it.railgunhit,
    {
        // removal from the list is handled below

        float foff = ExponentialFalloff(mindist, maxdist, halflifedist, it.railgundistance);
        float ffs = ExponentialFalloff(mindist, maxdist, forcehalflifedist, it.railgundistance);

        if(accuracy_isgooddamage(this, it))
            totaldmg += bdamage * foff;

        // apply the damage
        if (it.takedamage)
            Damage(it, this, this, bdamage * foff, deathtype, weaponentity, it.railgunhitloc, it.railgunforce * ffs);

        it.railgunhitloc = '0 0 0';
        it.railgunhitsolidbackup = SOLID_NOT;
        it.railgunhit = false;
        it.railgundistance = 0;
    });

    IL_CLEAR(g_railgunhit);

    if(headshot)
        Send_Notification(NOTIF_ONE, this, MSG_ANNCE, ANNCE_HEADSHOT);

    // calculate hits and fired shots for hitscan
    if(this.(weaponentity))
        accuracy_add(this, this.(weaponentity).m_weapon, 0, min(bdamage, totaldmg));

    trace_endpos = endpoint;
    trace_ent = endent;
    trace_dphitq3surfaceflags = endq3surfaceflags;
}

void fireBullet_trace_callback(vector start, vector hit, vector end)
{
    if(vdist(hit - start, >, 16))
        trailparticles(NULL, fireBullet_trace_callback_eff, start, hit);
    WarpZone_trace_forent = NULL;
    fireBullet_last_hit = NULL;
}

void fireBullet_antilag(entity this, .entity weaponentity, vector start, vector dir, float spread, float max_solid_penetration, float damage, float headshot_multiplier, float force, float dtype, entity tracer_effect, bool do_antilag)
{
    dir = normalize(dir + randomvec() * spread);
    vector end = start + dir * max_shot_distance;

    fireBullet_last_hit = NULL;
    fireBullet_trace_callback_eff = tracer_effect;

    float solid_penetration_fraction = 1;
    float damage_fraction = 1;
    float total_damage = 0;

    float lag = ((do_antilag) ? antilag_getlag(this) : 0);
    if(lag)
        antilag_takeback_all(this, lag);

    // change shooter to SOLID_BBOX so the shot can hit corpses
    int oldsolid = this.dphitcontentsmask;
    if(this)
        this.dphitcontentsmask = DPCONTENTS_SOLID | DPCONTENTS_BODY | DPCONTENTS_CORPSE;

    WarpZone_trace_forent = this;

    bool headshot = false; // indicates that one of the hit targets was a headshot
    for (;;)
    {
        WarpZone_TraceBox_ThroughZone(start, '0 0 0', '0 0 0', end, false, WarpZone_trace_forent, NULL, fireBullet_trace_callback);
        dir = WarpZone_TransformVelocity(WarpZone_trace_transform, dir);
        end = WarpZone_TransformOrigin(WarpZone_trace_transform, end);
        start = trace_endpos;
        entity hit = trace_ent;

        // traced up to max_shot_distance and didn't hit anything at all
        if (trace_fraction == 1.0)
            break;

        // When hitting sky, stop.
        if (trace_dphitq3surfaceflags & Q3SURFACEFLAG_SKY)
            break;

        // can't use noimpact, as we need to pass through walls
        //if (trace_dphitq3surfaceflags & Q3SURFACEFLAG_NOIMPACT)
            //break;

        // if we hit "weapclip", bail out
        //
        // rationale of this check:
        //
        // any shader that is solid, nodraw AND trans is meant to clip weapon
        // shots and players, but has no other effect!
        //
        // if it is not trans, it is caulk and should not have this side effect
        //
        // matching shaders:
        //   common/weapclip (intended)
        //   common/noimpact (is supposed to eat projectiles, but is erased anyway)
        bool is_weapclip = false;
        if(trace_dphitq3surfaceflags & Q3SURFACEFLAG_NODRAW)
        if (!(trace_dphitq3surfaceflags & Q3SURFACEFLAG_NONSOLID))
        if (!(trace_dphitcontents & DPCONTENTS_OPAQUE))
            is_weapclip = true;

        if(!hit || hit.solid == SOLID_BSP || hit.solid == SOLID_SLIDEBOX)
            Damage_DamageInfo(start, damage * damage_fraction, 0, 0, max(1, force) * dir * damage_fraction, dtype, hit.species, this);

        if (hit && hit != WarpZone_trace_forent && hit != fireBullet_last_hit)  // Avoid self-damage (except after going through a warp); avoid hitting the same entity twice (engine bug).
        {
            fireBullet_last_hit = hit;
            yoda = 0;
            MUTATOR_CALLHOOK(FireBullet_Hit, this, hit, start, end, damage, this.(weaponentity));
            damage = M_ARGV(4, float);
            if(headshot_multiplier && Headshot(hit, this, start, end))
            {
                damage *= headshot_multiplier;
                headshot = true;
            }
            bool gooddamage = accuracy_isgooddamage(this, hit);
            Damage(hit, this, this, damage * damage_fraction, dtype, weaponentity, start, force * dir * damage_fraction);
            // calculate hits for ballistic weapons
            if(gooddamage)
            {
                // do not exceed 100%
                float added_damage = min(damage - total_damage, damage * damage_fraction);
                total_damage += damage * damage_fraction;
                accuracy_add(this, this.(weaponentity).m_weapon, 0, added_damage);
            }
        }

        if (is_weapclip && !autocvar_g_ballistics_penetrate_clips)
            break;

        // go through solid!
        // outside the world? forget it
        if(start.x > world.maxs.x || start.y > world.maxs.y || start.z > world.maxs.z || start.x < world.mins.x || start.y < world.mins.y || start.z < world.mins.z)
            break;

        float maxdist;
        entity hitstore = IS_PLAYER(hit) ? PS(hit) : hit;
        if(max_solid_penetration < 0)
            break;
        else if(hitstore.ballistics_density < -1)
            break; // -2: no solid penetration, ever
        else if(hitstore.ballistics_density < 0)
            maxdist = vlen(hit.maxs - hit.mins) + 1; // -1: infinite travel distance
        else if(hitstore.ballistics_density == 0)
            maxdist = max_solid_penetration * solid_penetration_fraction;
        else
            maxdist = max_solid_penetration * solid_penetration_fraction / hitstore.ballistics_density;

        if(maxdist <= autocvar_g_ballistics_mindistance)
            break;

        // move the entity along its velocity until it's out of solid, then let it resume
        // The previously hit entity is ignored here!
        traceline_inverted (start, start + dir * maxdist, MOVE_NORMAL, WarpZone_trace_forent, true, hit);
        if(trace_fraction == 1) // 1: we never got out of solid
            break;

        float dist_taken = max(autocvar_g_ballistics_mindistance, vlen(trace_endpos - start));
        float fraction_used_of_what_is_left = dist_taken / maxdist;
        solid_penetration_fraction -= solid_penetration_fraction * fraction_used_of_what_is_left;
        solid_penetration_fraction = max(solid_penetration_fraction, 0);
        damage_fraction = pow(solid_penetration_fraction, autocvar_g_ballistics_solidpenetration_exponent);

        // Only show effect when going through a player (invisible otherwise)
        if (hit && (hit.solid != SOLID_BSP))
            if(vdist(trace_endpos - start, >, 4))
                trailparticles(this, fireBullet_trace_callback_eff, start, trace_endpos);

        start = trace_endpos;

        if(hit.solid == SOLID_BSP)
            Damage_DamageInfo(start, 0, 0, 0, max(1, force) * normalize(dir) * -damage_fraction, dtype, 0, this);
    }

    if(headshot)
        Send_Notification(NOTIF_ONE, this, MSG_ANNCE, ANNCE_HEADSHOT);

    if(lag)
        antilag_restore_all(this);

    // restore shooter solid type
    if(this)
        this.dphitcontentsmask = oldsolid;
}

void fireBullet(entity this, .entity weaponentity, vector start, vector dir, float spread, float max_solid_penetration, float damage, float headshot_multiplier, float force, float dtype, entity tracer_effect)
{
    fireBullet_antilag(this, weaponentity, start, dir, spread, max_solid_penetration, damage, headshot_multiplier, force, dtype, tracer_effect, true);
}

void crosshair_trace(entity pl)
{
    traceline_antilag(pl, CS(pl).cursor_trace_start, CS(pl).cursor_trace_start + normalize(CS(pl).cursor_trace_endpos - CS(pl).cursor_trace_start) * max_shot_distance, MOVE_NORMAL, pl, ANTILAG_LATENCY(pl));
}

void crosshair_trace_plusvisibletriggers(entity pl)
{
    crosshair_trace_plusvisibletriggers__is_wz(pl, false);
}

void WarpZone_crosshair_trace_plusvisibletriggers(entity pl)
{
    crosshair_trace_plusvisibletriggers__is_wz(pl, true);
}

void crosshair_trace_plusvisibletriggers__is_wz(entity pl, bool is_wz)
{
    FOREACH_ENTITY_FLOAT(solid, SOLID_TRIGGER,
    {
        if(it.model != "")
        {
            it.solid = SOLID_BSP;
            IL_PUSH(g_ctrace_changed, it);
        }
    });

    if (is_wz)
        WarpZone_crosshair_trace(pl);
    else
        crosshair_trace(pl);

    IL_EACH(g_ctrace_changed, true, { it.solid = SOLID_TRIGGER; });

    IL_CLEAR(g_ctrace_changed);
}

void WarpZone_crosshair_trace(entity pl)
{
    WarpZone_traceline_antilag(pl, CS(pl).cursor_trace_start, CS(pl).cursor_trace_start + normalize(CS(pl).cursor_trace_endpos - CS(pl).cursor_trace_start) * max_shot_distance, MOVE_NORMAL, pl, ANTILAG_LATENCY(pl));
}