walk.qc

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#include "walk.qh"

void _Movetype_Physics_Walk(entity this, float dt)  // SV_WalkMove
{
    // if frametime is 0 (due to client sending the same timestamp twice), don't move
    if (dt <= 0)
        return;

    if (GAMEPLAYFIX_UNSTICKPLAYERS(this) == 1)
        _Movetype_CheckStuck(this);

    bool applygravity = (!_Movetype_CheckWater(this) && this.move_movetype == MOVETYPE_WALK && !(this.flags & FL_WATERJUMP));

    _Movetype_CheckVelocity(this);

    // do a regular slide move unless it looks like you ran into a step
    bool oldonground = IS_ONGROUND(this);

    vector start_origin = this.origin;
    vector start_velocity = this.velocity;

    if(PHYS_WALLCLIP(this) && this.pm_time)
    {
        if(dt >= this.pm_time || (this.flags & FL_WATERJUMP))
            this.pm_time = 0;
        else
            this.pm_time -= dt;
    }

    int clip = _Movetype_FlyMove(this, dt, applygravity, false, GAMEPLAYFIX_STEPMULTIPLETIMES(this) ? PHYS_STEPHEIGHT(this) : 0);

    if (GAMEPLAYFIX_DOWNTRACEONGROUND(this) && !(clip & 1))
    {
        // only try this if there was no floor in the way in the trace (no,
        // this check seems to be not REALLY necessary, because if clip & 1,
        // our trace will hit that thing too)
        vector upmove = this.origin + '0 0 1';
        vector downmove = this.origin - '0 0 1';
        int type;
        if (this.move_movetype == MOVETYPE_FLYMISSILE)
            type = MOVE_MISSILE;
        else if (this.move_movetype == MOVETYPE_FLY_WORLDONLY)
            type = MOVE_WORLDONLY;
        else if (this.solid == SOLID_TRIGGER || this.solid == SOLID_NOT)
            type = MOVE_NOMONSTERS;
        else type = MOVE_NORMAL;
        tracebox(upmove, this.mins, this.maxs, downmove, type, this);
        if (trace_fraction < 1 && trace_plane_normal.z > 0.7)
        {
            clip |= 1;  // but we HAVE found a floor
            // set groundentity so we get carried when walking onto a mover
            this.groundentity = trace_ent;
        }
    }

    // if the move did not hit the ground at any point, we're not on ground
    if (!(clip & 1))
        UNSET_ONGROUND(this);
    else if(PHYS_WALLCLIP(this) && !this.groundentity && (PHYS_WALLCLIP(this) == 2 || start_velocity.z < -200)) // don't do landing time if we were just going down a slope
        this.pm_time = 0.25;

    _Movetype_CheckVelocity(this);
    _Movetype_LinkEdict(this, true);

    if (clip & 8)  // teleport
        return;

    if (this.flags & FL_WATERJUMP)
        return;

    if (PHYS_NOSTEP(this))
        return;

    vector originalorigin = this.origin;
    vector originalvelocity = this.velocity;
    // originalmove_clip = clip;
    int originalflags = this.flags;
    entity originalmove_groundentity = this.groundentity;

    // if move didn't block on a step, return
    if (clip & 2)
    {
        // if move was not trying to move into the step, return
        if (fabs(start_velocity.x) < 0.03125 && fabs(start_velocity.y) < 0.03125)
            return;

        if (this.move_movetype != MOVETYPE_FLY)
        {
            // return if gibbed by a trigger
            if (this.move_movetype != MOVETYPE_WALK)
                return;

            // return if attempting to jump while airborn (unless sv_jumpstep)
            if (!PHYS_JUMPSTEP(this))
                if (!oldonground && this.waterlevel == 0)
                    return;
        }

        // try moving up and forward to go up a step
        // back to start pos
        this.origin = start_origin;
        this.velocity = start_velocity;

        // move up
        vector upmove = '0 0 1' * PHYS_STEPHEIGHT(this);
        if(!_Movetype_PushEntity(this, upmove, true, true))
        {
            // we got teleported when upstepping... must abort the move
            return;
        }

        // move forward
        this.velocity_z = 0;
        clip = _Movetype_FlyMove(this, dt, applygravity, true, 0);
        this.velocity_z += start_velocity.z;
        if (clip & 8)
        {
            // we got teleported when upstepping... must abort the move
            // note that z velocity handling may not be what QC expects here, but we cannot help it
            return;
        }

        _Movetype_CheckVelocity(this);
        _Movetype_LinkEdict(this, true);

        // check for stuckness, possibly due to the limited precision of floats
        // in the clipping hulls
        if (clip
            && fabs(originalorigin.y - this.origin.y) < 0.03125
            && fabs(originalorigin.x - this.origin.x) < 0.03125)
        {
            // Con_Printf("wall\n");
            // stepping up didn't make any progress, revert to original move
            this.origin = originalorigin;
            this.velocity = originalvelocity;
            // clip = originalmove_clip;
            this.flags = originalflags;
            this.groundentity = originalmove_groundentity;
            // now try to unstick if needed
            // clip = SV_TryUnstick (ent, oldvel);
            return;
        }

        // Con_Printf("step - ");

        // extra friction based on view angle
        if ((clip & 2) && PHYS_WALLFRICTION(this))
            _Movetype_WallFriction(this, move_stepnormal);
    }
    // don't do the down move if stepdown is disabled, moving upward, not in water, or the move started offground or ended onground
    else if (!GAMEPLAYFIX_STEPDOWN(this) || this.waterlevel >= 3 || start_velocity.z >= (1.0 / 32.0) 
                || !oldonground || IS_ONGROUND(this) || (GAMEPLAYFIX_STEPDOWN_MAXSPEED(this) && vdist(start_velocity, >=, GAMEPLAYFIX_STEPDOWN_MAXSPEED(this)) && !IS_ONSLICK(this)))
    {
        return;
    }

    // move down
    vector downmove = '0 0 0';
    downmove.z = -PHYS_STEPHEIGHT(this) + start_velocity.z * dt;
    if(!_Movetype_PushEntity(this, downmove, true, true))
    {
        // we got teleported when downstepping... must abort the move
        return;
    }

    if (trace_fraction < 1 && trace_plane_normal.z > 0.7)
    {
        // this has been disabled so that you can't jump when you are stepping
        // up while already jumping (also known as the Quake2 double jump bug)
        // LordHavoc: disabled this check so you can walk on monsters/players
        //if (PRVM_serveredictfloat(ent, solid) == SOLID_BSP)
        if(GAMEPLAYFIX_STEPDOWN(this) == 2)
        {
            SET_ONGROUND(this);
            this.groundentity = trace_ent;
        }
    }
    else
    {
        // Con_Printf("slope\n");
        // if the push down didn't end up on good ground, use the move without
        // the step up.  This happens near wall / slope combinations, and can
        // cause the player to hop up higher on a slope too steep to climb
        this.origin = originalorigin;
        this.velocity = originalvelocity;
        this.flags = originalflags;
        this.groundentity = originalmove_groundentity;
    }

    _Movetype_CheckVelocity(this);
    _Movetype_LinkEdict(this, true);
}