[xonotic/xonotic-data.pk3dir.git] / qcsrc / server / weapons / tracing.qc

#include "tracing.qh"

#include <common/effects/all.qh>

#include "accuracy.qh"
#include "common.qh"
#include "hitplot.qh"
#include "weaponsystem.qh"

#include "../damage.qh"
#include <server/main.qh>
#include <server/mutators/_mod.qh>
#include <server/antilag.qh>

#include <common/constants.qh>
#include <common/net_linked.qh>
#include <common/util.qh>

#include <common/weapons/_all.qh>
#include <common/wepent.qh>
#include <common/state.qh>

#include <lib/warpzone/common.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');

        // TODO this is broken - see 637056bea7bf7f5c9c0fc6113e94731a2767476 for an attempted fix
        // which fixes issue #1957 but causes #2129
        vector dv = right * -vecs.y + up * vecs.z;
        w_shotorg = ent.origin + ent.view_ofs + dv;

        // 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(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 = spawn(); // 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));
}