e_event_actorappear.cpp

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/*
Copyright (C) 2002-2025 UFO: Alien Invasion.
 
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
See the GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
*/
 
#include "../../../../client.h"
#include "e_event_actorappear.h"
#include "../../../cl_localentity.h"
#include "../../../cl_ugv.h"
#include "../../../cl_actor.h"
#include "../../../cl_hud.h"
#include "../../../../cgame/cl_game.h"
#include "../../../cl_particle.h"
#include "../../../../../common/grid.h"

int CL_ActorAppearTime (const eventRegister_t* self, dbuffer* msg, eventTiming_t* eventTiming)
{
    const int eventTime = eventTiming->nextTime;
 
    /* delay following events */
    if (!cls.isOurRound())
        eventTiming->nextTime += 600;
 
    return eventTime;
}

static void CL_DrawLineOfSight (const le_t* watcher, const le_t* target)
{
    if (!watcher || !target)
        return;
 
    /* start is the watchers origin */
    vec3_t eyes;
    VectorCopy(watcher->origin, eyes);
    if (LE_IsCrouched(watcher))
        eyes[2] += EYE_HT_CROUCH;
    else
        eyes[2] += EYE_HT_STAND;
 
    ptl_t* ptl = CL_ParticleSpawn("fadeTracer", 0, eyes, target->origin);
    if (ptl == nullptr)
        return;
 
    if (LE_IsCivilian(target))
        VectorSet(ptl->color, 0.2, 0.2, 1);
}

void CL_ActorAppear (const eventRegister_t* self, dbuffer* msg)
{
 
    /* check if the actor is already visible */
    const int entnum = NET_ReadShort(msg);
    const int entnumResponsible = NET_ReadShort(msg);
    le_t* le = LE_Get(entnum);
    le_t* leResponsible = LE_Get(entnumResponsible);
 
    if (entnumResponsible != SKIP_LOCAL_ENTITY && !leResponsible)
        LE_NotFoundError(entnumResponsible);
 
    /* mission start - no actor is spawned yet - so create it */
    if (!le)
        le = LE_Add(entnum);
 
    /* Locking should be unnecessary if CL_CheckDefault filters this call, since this event starts and
     * ends in this function only.  Adding lock/unlock just to be sure. */
    LE_Lock(le);
 
    /* maybe added via CL_ActorAdd before */
    le->flags &= ~LE_INVISIBLE;
 
    /* get the info */
    int teamDefID = -1;
    int modelnum1, modelnum2;
    NET_ReadFormat(msg, self->formatString,
            &le->team, &teamDefID, &le->gender, &le->ucn, &le->pnum, &le->pos,
            &le->angle, &le->right, &le->left,
            &modelnum1, &modelnum2, &le->bodySkin, &le->headSkin,
            &le->state, &le->fieldSize,
            &le->maxTU, &le->maxMorale, &le->maxHP);
 
    if (teamDefID < 0 || teamDefID > csi.numTeamDefs)
        Com_Printf("CL_ActorAppear: Invalid teamDef index\n");
    else
        le->teamDef = &csi.teamDef[teamDefID];
 
    switch (le->fieldSize) {
    case ACTOR_SIZE_NORMAL:
        le->addFunc = CL_AddActor;
        le->type = ET_ACTOR;
        break;
    case ACTOR_SIZE_2x2:
        le->addFunc = CL_AddUGV;
        le->type = ET_ACTOR2x2;
        break;
    default:
        Com_Error(ERR_DROP, "Unknown fieldSize for le in CL_ActorAppear (EV_ACTOR_APPEAR)");
    }
    le->modelnum1 = modelnum1;
    le->modelnum2 = modelnum2;
    le->model1 = LE_GetDrawModel(modelnum1);
    le->model2 = LE_GetDrawModel(modelnum2);
    Grid_PosToVec(cl.mapData->routing, le->fieldSize, le->pos, le->origin);
    le->angles[YAW] = directionAngles[le->angle];
 
    if (LE_IsDead(le) && !LE_IsStunned(le))
        le->contents = CONTENTS_DEADACTOR;
    else
        le->contents = CONTENTS_ACTOR;
    le->aabb.setMins(player_mins);
    if (LE_IsDead(le))
        le->aabb.setMaxs(player_dead_maxs);
    else
        le->aabb.setMaxs(player_maxs);
 
    LE_SetThink(le, LET_StartIdle);
 
    /* count spotted aliens (also stunned) */
    cl.numEnemiesSpotted = CL_CountVisibleEnemies();
    Cvar_SetValue("mn_numaliensspotted", cl.numEnemiesSpotted);
 
    if (LE_IsLivingActor(le)) {
        if (!cls.isOurRound()) {
            /* center view (if wanted) */
            if (leResponsible) {
                CL_CheckCameraRoute(leResponsible->pos, le->pos);
            } else {
                LE_CenterView(le);
            }
        }
 
        /* draw line of sight */
        if (le->team != cls.team) {
            if (leResponsible)
                CL_DrawLineOfSight(leResponsible, le);
 
            /* message */
            if (le->team != TEAM_CIVILIAN) {
                if (GAME_TeamIsKnown(le->teamDef)) {
                    char tmpbuf[128];
                    Com_sprintf(tmpbuf, sizeof(tmpbuf), _("Enemy spotted: %s!"), _(le->teamDef->name));
                    HUD_DisplayMessage(tmpbuf);
                } else
                    HUD_DisplayMessage(_("Unknown enemy spotted!"));
            } else
                HUD_DisplayMessage(_("Civilian spotted."));
 
            /* update pathing as new actor could block path */
            CL_ActorConditionalMoveCalc(leResponsible ? leResponsible : selActor);
        }
    }
 
    /* add team members to the actor list */
    CL_ActorAddToTeamList(le);
    LE_Unlock(le);
}