g_phys.c

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/*
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"

void G_PhysicsStep (edict_t *ent)
{
    if (ent->moveinfo.currentStep < ent->moveinfo.steps) {
        const int contentFlags = ent->contentFlags;
        const int visflags = ent->moveinfo.visflags[ent->moveinfo.currentStep];
        /* Send the sound effect to everyone how's not seeing the actor */
        if (!G_IsCrouched(ent)) {
            if (contentFlags & CONTENTS_WATER) {
                if (ent->moveinfo.contentFlags[ent->moveinfo.currentStep] & CONTENTS_WATER) {
                    /* looks like we already are in the water */
                    /* send water moving sound */
                    gi.PositionedSound(~G_VisToPM(visflags), ent->origin, ent, "footsteps/water_under");
                } else {
                    /* send water entering sound */
                    gi.PositionedSound(~G_VisToPM(visflags), ent->origin, ent, "footsteps/water_in");
                }
            } else if (ent->contentFlags & CONTENTS_WATER) {
                /* send water leaving sound */
                gi.PositionedSound(~G_VisToPM(visflags), ent->origin, ent, "footsteps/water_out");
            } else {
                trace_t trace;
                vec3_t from, to;

                VectorCopy(ent->origin, to);
                VectorCopy(ent->origin, from);
                /* we should really hit the ground with this */
                to[2] -= UNIT_HEIGHT;

                trace = G_Trace(from, to, NULL, MASK_SOLID);
                if (trace.surface) {
                    const char *snd = gi.GetFootstepSound(trace.surface->name);
                    if (snd)
                        gi.PositionedSound(~G_VisToPM(visflags), ent->origin, ent, snd);
                }
            }
        }

        /* and now save the new contents */
        ent->contentFlags = ent->moveinfo.contentFlags[ent->moveinfo.currentStep];
        ent->moveinfo.currentStep++;

        /* Immediately re-think */
        ent->nextthink = (level.framenum + 3) * SERVER_FRAME_SECONDS;
    } else {
        ent->moveinfo.currentStep = 0;
        ent->moveinfo.steps = 0;
        ent->think = NULL;
    }
}

static qboolean G_PhysicsThink (edict_t *ent)
{
    if (ent->nextthink <= 0)
        return qtrue;
    if (ent->nextthink > level.time + 0.001f)
        return qtrue;

    ent->nextthink = level.time + SERVER_FRAME_SECONDS;
    if (!ent->think)
        gi.Error("G_PhysicsThink ent->think is NULL");
    ent->think(ent);

    return qfalse;
}

void G_PhysicsRun (void)
{
    edict_t *ent = NULL;

    /* not all teams are spawned or game has already ended */
    if (!G_MatchIsRunning())
        return;

#if 0 /* taken out - otherwise footstep sounds are too slow */
    /* don't run this too often to prevent overflows */
    if (level.framenum % 10)
        return;
#endif

    /* treat each object in turn */
    /* even the world gets a chance to think */
    while ((ent = G_EdictsGetNextInUse(ent))) {
        if (ent->think)
            G_PhysicsThink(ent);
    }
}