g_main.cpp

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/*
All original material Copyright (C) 2002-2025 UFO: Alien Invasion.
 
Original file from Quake 2 v3.21: quake2-2.31/game/g_main.c
Copyright (C) 1997-2001 Id Software, Inc.
 
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 "g_local.h"
#include "g_ai.h"
#include "g_client.h"
#include "g_edicts.h"
#include "g_match.h"
#include "g_spawn.h"
#include "g_utils.h"
 
game_locals_t game;
level_locals_t level;
game_import_t gi;
game_export_t globals;
 
#ifndef HARD_LINKED_GAME
cvar_t* sv_maxclients;
cvar_t* sv_dedicated;
cvar_t* developer;
#endif
 
cvar_t* logstats;
FILE* logstatsfile;
 
cvar_t* sv_needpass;
cvar_t* sv_maxplayersperteam;
cvar_t* sv_maxsoldiersperteam;
cvar_t* sv_maxsoldiersperplayer;
cvar_t* sv_enablemorale;
cvar_t* sv_roundtimelimit;
cvar_t* sv_maxentities;
cvar_t* sv_filterban;
cvar_t* sv_maxteams;
cvar_t* sv_ai;
cvar_t* sv_teamplay;
cvar_t* sv_hurtaliens;
cvar_t* sv_shot_origin;
static cvar_t* sv_cheats;
static cvar_t* sv_send_edicts;
 
cvar_t* password;
 
cvar_t* ai_alienteam;
cvar_t* ai_civilianteam;
cvar_t* ai_equipment;
cvar_t* ai_singleplayeraliens;
cvar_t* ai_numcivilians;
cvar_t* ai_multiplayeraliens;
 
/* morale cvars */
cvar_t* mob_death;
cvar_t* mob_wound;
cvar_t* mob_shoot;
cvar_t* mof_watching;
cvar_t* mof_teamkill;
cvar_t* mof_civilian;
cvar_t* mof_enemy;
cvar_t* mor_pain;
 
/*everyone gets this times morale damage */
cvar_t* mor_default;
 
/*at this distance the following two get halfed (exponential scale) */
cvar_t* mor_distance;
 
/*at this distance the following two get halfed (exponential scale) */
cvar_t* mor_victim;
 
/*at this distance the following two get halfed (exponential scale) */
cvar_t* mor_attacker;
 
/* how much the morale depends on the size of the damaged team */
cvar_t* mon_teamfactor;
 
cvar_t* mor_regeneration;
cvar_t* mor_shaken;
cvar_t* mor_panic;
cvar_t* mor_brave;
 
cvar_t* m_sanity;
cvar_t* m_rage;
cvar_t* m_rage_stop;
cvar_t* m_panic_stop;
 
cvar_t* g_endlessaliens;
cvar_t* g_ailua;
cvar_t* g_aihumans;
cvar_t* g_aidebug;
cvar_t* g_drawtraces;
cvar_t* g_nodamage;
cvar_t* g_notu;
cvar_t* g_nospawn;
cvar_t* g_actorspeed;
cvar_t* g_lastseen;
cvar_t* flood_msgs;
cvar_t* flood_persecond;
cvar_t* flood_waitdelay;
 
cvar_t* g_difficulty;
 
static const int TAG_INVENTORY = 2389;
 
static void G_FreeInventory (void* data)
{
    G_MemFree(data);
}
 
static void* G_AllocInventoryMemory (size_t size)
{
    return G_TagMalloc(size, TAG_INVENTORY);
}
 
static void G_FreeAllInventory (void)
{
    G_FreeTags(TAG_INVENTORY);
}
 
static const inventoryImport_t inventoryImport = { G_FreeInventory, G_FreeAllInventory, G_AllocInventoryMemory };
 

static void G_Init (void)
{
    gi.DPrintf("==== InitGame ====\n");
 
    /* noset vars */
    sv_dedicated = gi.Cvar_Get("sv_dedicated", "0", CVAR_SERVERINFO | CVAR_NOSET, "Is this a dedicated server?");
 
    /* latched vars */
    sv_cheats = gi.Cvar_Get("sv_cheats", "0", CVAR_SERVERINFO | CVAR_LATCH, "Activate cheats");
    gi.Cvar_Get("gamename", GAMEVERSION, CVAR_SERVERINFO | CVAR_LATCH, nullptr);
    gi.Cvar_Get("gamedate", "May 14 2025", CVAR_SERVERINFO | CVAR_LATCH, nullptr);
    developer = gi.Cvar_Get("developer", "0", 0, "Print out a lot of developer debug messages - useful to track down bugs");
    logstats = gi.Cvar_Get("logstats", "1", CVAR_ARCHIVE, "Server logfile output for kills");
 
    /* max. players per team (original quake) */
    sv_maxplayersperteam = gi.Cvar_Get("sv_maxplayersperteam", "8", CVAR_SERVERINFO | CVAR_LATCH, "How many players (humans) may a team have");
    /* max. soldiers per team */
    sv_maxsoldiersperteam = gi.Cvar_Get("sv_maxsoldiersperteam", "4", CVAR_ARCHIVE | CVAR_SERVERINFO, "How many soldiers may one team have");
    /* max soldiers per player */
    sv_maxsoldiersperplayer = gi.Cvar_Get("sv_maxsoldiersperplayer", DOUBLEQUOTE(MAX_ACTIVETEAM), CVAR_ARCHIVE | CVAR_SERVERINFO, "How many soldiers one player is able to control in a given team");
    /* enable moralestates in multiplayer */
    sv_enablemorale = gi.Cvar_Get("sv_enablemorale", "1", CVAR_ARCHIVE | CVAR_SERVERINFO | CVAR_LATCH, "Enable morale behaviour for actors");
    sv_roundtimelimit = gi.Cvar_Get("sv_roundtimelimit", "90", CVAR_ARCHIVE | CVAR_SERVERINFO, "Timelimit in seconds for multiplayer rounds");
    sv_roundtimelimit->modified = false;
    sv_maxentities = gi.Cvar_Get("sv_maxentities", "1024", CVAR_LATCH, nullptr);
 
    sv_maxteams = gi.Cvar_Get("sv_maxteams", "2", CVAR_SERVERINFO, "How many teams for current running map");
    sv_maxteams->modified = false;
 
    /* change anytime vars */
    password = gi.Cvar_Get("password", "", CVAR_USERINFO, nullptr);
    sv_needpass = gi.Cvar_Get("sv_needpass", "0", CVAR_SERVERINFO, nullptr);
    sv_filterban = gi.Cvar_Get("sv_filterban", "1", 0, nullptr);
    sv_ai = gi.Cvar_Get("sv_ai", "1", 0, "Activate or deativate the ai");
    sv_teamplay = gi.Cvar_Get("sv_teamplay", "0", CVAR_ARCHIVE | CVAR_LATCH | CVAR_SERVERINFO, "Is teamplay activated? see sv_maxclients, sv_maxplayersperteam, sv_maxsoldiersperteam and sv_maxsoldiersperplayer");
    /* how many connected clients */
    sv_maxclients = gi.Cvar_Get("sv_maxclients", "1", CVAR_SERVERINFO, "If sv_maxclients is 1 we are in singleplayer - otherwise we are mutliplayer mode (see sv_teamplay)");
    sv_shot_origin = gi.Cvar_Get("sv_shot_origin", "8", 0, "Assumed distance of muzzle from model");
    sv_send_edicts = gi.Cvar_Get("sv_send_edicts", "0", CVAR_ARCHIVE | CVAR_CHEAT, "Send server side edicts for client display like triggers");
    sv_hurtaliens = gi.Cvar_Get("sv_hurtaliens", "0", CVAR_SERVERINFO, "Spawn hurt aliens");
 
    ai_alienteam = gi.Cvar_Get("ai_alienteam", "ortnok", 0, "Alien team");
    ai_civilianteam = gi.Cvar_Get("ai_civilianteam", "europe", 0, "Civilian team");
    /* this cvar is set in singleplayer via campaign definition */
    ai_equipment = gi.Cvar_Get("ai_equipment", "multiplayer_alien", 0, "Initial equipment definition for aliens");
    /* aliens in singleplayer (can differ each mission) */
    ai_singleplayeraliens = gi.Cvar_Get("ai_singleplayeraliens", "30", 0, "How many aliens in this battle (singleplayer)");
    /* civilians for singleplayer */
    ai_numcivilians = gi.Cvar_Get("ai_numcivilians", "10", 0, "How many civilians in this battle");
    /* aliens in multiplayer */
    ai_multiplayeraliens = gi.Cvar_Get("ai_multiplayeraliens", "8", CVAR_ARCHIVE, "How many (ai controlled) actors in this battle (multiplayer)");
 
    mob_death = gi.Cvar_Get("mob_death", "10", CVAR_LATCH|CVAR_NOSET, nullptr);
    mob_wound = gi.Cvar_Get("mob_wound", "0.1", CVAR_LATCH|CVAR_NOSET, nullptr);
    mob_shoot = gi.Cvar_Get("mob_shoot", "0.1", CVAR_LATCH|CVAR_NOSET, nullptr);
    mof_watching = gi.Cvar_Get("mof_watching", "1.7", CVAR_LATCH|CVAR_NOSET, nullptr);
    mof_teamkill = gi.Cvar_Get("mof_teamkill", "2.0", CVAR_LATCH|CVAR_NOSET, nullptr);
    mof_civilian = gi.Cvar_Get("mof_civilian", "0.3", CVAR_LATCH|CVAR_NOSET, nullptr);
    mof_enemy = gi.Cvar_Get("mof_ememy", "0.5", CVAR_LATCH|CVAR_NOSET, nullptr);
    mor_pain = gi.Cvar_Get("mof_pain", "3.6", CVAR_LATCH|CVAR_NOSET, nullptr);
    /* everyone gets this times morale damage */
    mor_default = gi.Cvar_Get("mor_default", "0.3", CVAR_LATCH|CVAR_NOSET, "Everyone gets this times morale damage");
    /* at this distance the following two get halved (exponential scale) */
    mor_distance = gi.Cvar_Get("mor_distance", "120", CVAR_LATCH|CVAR_NOSET, "At this distance the following two get halved (exponential scale)");
    /* at this distance the following two get halved (exponential scale) */
    mor_victim = gi.Cvar_Get("mor_victim", "0.7", CVAR_LATCH|CVAR_NOSET, "At this distance the following two get halved (exponential scale)");
    /* at this distance the following two get halved (exponential scale) */
    mor_attacker = gi.Cvar_Get("mor_attacker", "0.3", CVAR_LATCH|CVAR_NOSET, "At this distance the following two get halved (exponential scale)");
    /* how much the morale depends on the size of the damaged team */
    mon_teamfactor = gi.Cvar_Get("mon_teamfactor", "0.6", CVAR_LATCH|CVAR_NOSET, "How much the morale depends on the size of the damaged team");
 
    mor_regeneration = gi.Cvar_Get("mor_regeneration", "15", CVAR_LATCH|CVAR_NOSET, nullptr);
    mor_shaken = gi.Cvar_Get("mor_shaken", "50", CVAR_LATCH|CVAR_NOSET, nullptr);
    mor_panic = gi.Cvar_Get("mor_panic", "30", CVAR_LATCH|CVAR_NOSET, nullptr);
    mor_brave = gi.Cvar_Get("mor_brave", "85", CVAR_LATCH|CVAR_NOSET, nullptr);
 
    m_sanity = gi.Cvar_Get("m_sanity", "1.0", CVAR_LATCH|CVAR_NOSET, nullptr);
    m_rage = gi.Cvar_Get("m_rage", "0.6", CVAR_LATCH|CVAR_NOSET, nullptr);
    m_rage_stop = gi.Cvar_Get("m_rage_stop", "2.0", CVAR_LATCH|CVAR_NOSET, nullptr);
    m_panic_stop = gi.Cvar_Get("m_panic_stop", "1.0", CVAR_LATCH|CVAR_NOSET, nullptr);
 
    g_endlessaliens = gi.Cvar_Get("g_endlessaliens", "0", CVAR_LATCH|CVAR_SERVERINFO, "Spawn endless aliens");
    g_ailua = gi.Cvar_Get("g_ailua", "0", 0, "Activate or deactivate the LUA AI");
    g_aihumans = gi.Cvar_Get("g_aihumans", "0", CVAR_DEVELOPER, "Activate or deactivate the ai for human actors");
    g_aidebug = gi.Cvar_Get("g_aidebug", "0", CVAR_DEVELOPER|CVAR_CHEAT, "All AI actors are visible");
    g_drawtraces = gi.Cvar_Get("g_drawtraces", "0", CVAR_DEVELOPER, "All traces will be rendered");
    g_nodamage = gi.Cvar_Get("g_nodamage", "0", CVAR_DEVELOPER|CVAR_CHEAT, "No damage in developer mode");
    g_notu = gi.Cvar_Get("g_notu", "0", CVAR_DEVELOPER|CVAR_CHEAT, "No TU costs while performing any action");
    g_actorspeed = gi.Cvar_Get("g_actorspeed", "1.0", CVAR_ARCHIVE|CVAR_SERVERINFO, "Moving speed of the actor");
    g_lastseen = gi.Cvar_Get("g_lastseen", "20", CVAR_ARCHIVE|CVAR_SERVERINFO, "Quit the match if no player was seen in this amount of rounds");
    g_nospawn = gi.Cvar_Get("g_nospawn", "0", CVAR_DEVELOPER|CVAR_CHEAT, "Do not spawn a soldier");
 
    /* flood control */
    flood_msgs = gi.Cvar_Get("flood_msgs", "4", 0, nullptr);
    flood_persecond = gi.Cvar_Get("flood_persecond", "4", 0, nullptr);
    flood_waitdelay = gi.Cvar_Get("flood_waitdelay", "10", 0, "Delay until someone is unlocked from talking again");
 
    g_difficulty = gi.Cvar_Get("g_difficulty", "0", CVAR_NOSET, "Singleplayer difficulty level");
 
    game.sv_maxentities = sv_maxentities->integer;
    game.sv_maxplayersperteam = sv_maxplayersperteam->integer;
 
    /* initialize the entity storage */
    globals.edicts = G_EdictsConstruct();
    globals.max_edicts = game.sv_maxentities;
    globals.num_edicts = game.sv_maxplayersperteam;
 
    /* initialize all players for this game */
    /* game.sv_maxplayersperteam for human controlled players
     * + game.sv_maxplayer for ai */
    game.players = static_cast<player_t*>(G_TagMalloc(game.sv_maxplayersperteam * 2 * sizeof(game.players[0]), TAG_GAME));
    globals.players = game.players;
    globals.maxplayersperteam = game.sv_maxplayersperteam;
 
    /* init csi and inventory */
    INVSH_InitCSI(gi.csi);
    game.invi.initInventory("game", gi.csi, &inventoryImport);
 
    if (logstats->integer)
        logstatsfile = gi.Sys_Fopen(va("%s/stats.log", gi.FS_Gamedir()), "a");
    else
        logstatsfile = nullptr;
 
    AI_Init();
    AIL_Init();
}

static void G_Shutdown (void)
{
    gi.DPrintf("==== ShutdownGame ====\n");
 
    AIL_Shutdown();
 
    if (logstatsfile)
        fclose(logstatsfile);
    logstatsfile = nullptr;
 
    G_FreeTags(TAG_LEVEL);
    G_FreeTags(TAG_GAME);
    G_FreeAllInventory();
 
    Com_Printf("Used inventory slots in game on shutdown: %i\n", game.invi.GetUsedSlots());
}

static void CheckNeedPass (void)
{
    if (password->modified) {
        password->modified = false;
 
        const int need = Q_strvalid(password->string) && Q_strcasecmp(password->string, "none") ? 1 : 0;
        gi.Cvar_Set("sv_needpass", "%i", need);
    }
}
 
static void G_SendBoundingBoxes (void)
{
    if (!sv_send_edicts->integer)
        return;
 
    Edict* ent = G_EdictsGetFirst();    /* skip the world */
    while ((ent = G_EdictsGetNextInUse(ent)))
        G_EventSendEdict(*ent);
}

static bool G_RunFrame (void)
{
    level.framenum++;
    /* server is running at 10 fps */
    level.time = level.framenum * SERVER_FRAME_SECONDS;
 
    /* this doesn't belong here, but it works */
    if (!level.routed) {
        level.routed = true;
        G_CompleteRecalcRouting();
    }
 
    /* still waiting for other players */
    if (!G_MatchIsRunning()) {
        if (sv_maxteams->modified) {
            /* inform the client */
            gi.ConfigString(CS_MAXTEAMS, "%i", sv_maxteams->integer);
            sv_maxteams->modified = false;
        }
    }
 
    if (G_IsMultiPlayer()) {
        if (sv_roundtimelimit->modified) {
            /* some played around here - restart the count down */
            level.roundstartTime = level.time;
            /* don't allow smaller values here */
            if (sv_roundtimelimit->integer < 30 && sv_roundtimelimit->integer > 0) {
                gi.DPrintf("The minimum value for sv_roundtimelimit is 30\n");
                gi.Cvar_Set("sv_roundtimelimit", "30");
            }
            sv_roundtimelimit->modified = false;
        }
        G_CheckForceEndRound();
    }
 
    /* end this game? */
    if (G_MatchDoEnd())
        return true;
 
    CheckNeedPass();
 
    /* run ai */
    AI_Run();
 
    /* not all teams are spawned or game has already ended */
    if (G_MatchIsRunning())
        G_EdictsThink();
 
    G_SendBoundingBoxes();
 
    return false;
}

game_export_t* GetGameAPI (game_import_t* import)
{
    gi = *import;
    srand(gi.seed);
 
    globals.apiversion = GAME_API_VERSION;
    globals.Init = G_Init;
    globals.Shutdown = G_Shutdown;
    globals.SpawnEntities = G_SpawnEntities;
 
    globals.ClientConnect = G_ClientConnect;
    globals.ClientUserinfoChanged = G_ClientUserinfoChanged;
    globals.ClientDisconnect = G_ClientDisconnect;
    globals.ClientBegin = G_ClientBegin;
    globals.ClientStartMatch = G_ClientStartMatch;
    globals.ClientCommand = G_ClientCommand;
    globals.ClientAction = G_ClientAction;
    globals.ClientEndRound = G_ClientEndRound;
    globals.ClientTeamInfo = G_ClientTeamInfo;
    globals.ClientInitActorStates = G_ClientInitActorStates;
    globals.ClientGetTeamNum = G_ClientGetTeamNum;
    globals.ClientIsReady = G_ClientIsReady;
    globals.ClientGetName = G_GetPlayerName;
    globals.ClientGetActiveTeam = G_GetActiveTeam;
 
    globals.RunFrame = G_RunFrame;
 
    globals.ServerCommand = G_ServerCommand;
 
    globals.edict_size = sizeof(Edict);
    globals.player_size = sizeof(player_t);
 
    return &globals;
}
 
#ifndef HARD_LINKED_GAME
/* this is only here so the functions in the shared code can link */
void Sys_Error (const char* error, ...)
{
    va_list argptr;
    char text[1024];
 
    va_start(argptr, error);
    Q_vsnprintf(text, sizeof(text), error, argptr);
    va_end(argptr);
 
    gi.Error("%s", text);
}
 
void Com_Printf (const char* msg, ...)
{
    va_list argptr;
    char text[1024];
 
    va_start(argptr, msg);
    Q_vsnprintf(text, sizeof(text), msg, argptr);
    va_end(argptr);
 
    gi.DPrintf("%s", text);
}
 
void Com_DPrintf (int level, const char* msg, ...)
{
    va_list argptr;
    char text[1024];
 
    /* don't confuse non-developers with techie stuff... */
    if (!developer || developer->integer == 0)
        return;
 
    if (!(developer->integer & level))
        return;
 
    va_start(argptr, msg);
    Q_vsnprintf(text, sizeof(text), msg, argptr);
    va_end(argptr);
 
    gi.DPrintf("%s", text);
}
#endif