path: root/src/jake2/qcommon/PMove.java

/*
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.

*/

// Created on 25.01.2004 by RST.
// $Id: PMove.java,v 1.4 2004-09-10 19:02:53 salomo Exp $

package jake2.qcommon;

import jake2.*;
import jake2.client.*;
import jake2.game.*;
import jake2.qcommon.*;
import jake2.render.*;
import jake2.server.*;

public class PMove extends Game
{

	public final static int STEPSIZE = 18;

	// all of the locals will be zeroed before each
	// pmove, just to make damn sure we don't have
	// any differences when running on client or server

	public static class pml_t
	{
		float[] origin = { 0, 0, 0 }; // full float precision
		float[] velocity = { 0, 0, 0 }; // full float precision

		float[] forward = { 0, 0, 0 }, right = { 0, 0, 0 }, up = { 0, 0, 0 };
		float frametime;

		csurface_t groundsurface;
		cplane_t groundplane = new cplane_t();
		int groundcontents;

		float[] previous_origin = { 0, 0, 0 };
		boolean ladder;
	}

	public static pmove_t pm;
	public static pml_t pml = new pml_t();

	// movement parameters
	public static float pm_stopspeed = 100;
	public static float pm_maxspeed = 300;
	public static float pm_duckspeed = 100;
	public static float pm_accelerate = 10;
	public static float pm_airaccelerate = 0;
	public static float pm_wateraccelerate = 10;
	public static float pm_friction = 6;
	public static float pm_waterfriction = 1;
	public static float pm_waterspeed = 400;

	/*
	
	  walking up a step should kill some velocity
	
	*/

	/*
	==================
	PM_ClipVelocity
	
	Slide off of the impacting object
	returns the blocked flags (1 = floor, 2 = step / wall)
	==================
	*/
	public static final float STOP_EPSILON = 0.1f;

	public static void PM_ClipVelocity(float[] in, float[] normal, float[] out, float overbounce)
	{
		float backoff;
		float change;
		int i;

		backoff = DotProduct(in, normal) * overbounce;

		for (i = 0; i < 3; i++)
		{
			change = normal[i] * backoff;
			out[i] = in[i] - change;
			if (out[i] > -STOP_EPSILON && out[i] < STOP_EPSILON)
				out[i] = 0;
		}
	}

	/*
	==================
	PM_StepSlideMove
	
	Each intersection will try to step over the obstruction instead of
	sliding along it.
	
	Returns a new origin, velocity, and contact entity
	Does not modify any world state?
	==================
	*/
	public final static float MIN_STEP_NORMAL = 0.7f; // can't step up onto very steep slopes

	public static void PM_StepSlideMove_()
	{
		int bumpcount, numbumps;
		float[] dir = { 0, 0, 0 };
		float d;
		int numplanes;
		float[] planes[] = new float[MAX_CLIP_PLANES][3];
		float[] primal_velocity = { 0, 0, 0 };
		int i, j;
		trace_t trace;
		float[] end = { 0, 0, 0 };
		float time_left;

		numbumps = 4;

		VectorCopy(pml.velocity, primal_velocity);
		numplanes = 0;

		time_left = pml.frametime;

		for (bumpcount = 0; bumpcount < numbumps; bumpcount++)
		{
			for (i = 0; i < 3; i++)
				end[i] = pml.origin[i] + time_left * pml.velocity[i];

			trace = pm.trace.trace(pml.origin, pm.mins, pm.maxs, end);

			if (trace.allsolid)
			{ // entity is trapped in another solid
				pml.velocity[2] = 0; // don't build up falling damage
				return;
			}

			if (trace.fraction > 0)
			{ // actually covered some distance
				VectorCopy(trace.endpos, pml.origin);
				numplanes = 0;
			}

			if (trace.fraction == 1)
				break; // moved the entire distance

			// save entity for contact
			if (pm.numtouch < MAXTOUCH && trace.ent != null)
			{
				//rst: just for debugging touches.
				//if (trace.ent.index != -1 && trace.ent.index != 0) 
					//Com.p("touch: " + trace.ent.classname + " (" + trace.ent.index + ")" );
					
				pm.touchents[pm.numtouch] = trace.ent;
				pm.numtouch++;
			}

			time_left -= time_left * trace.fraction;

			// slide along this plane
			if (numplanes >= MAX_CLIP_PLANES)
			{ // this shouldn't really happen
				VectorCopy(vec3_origin, pml.velocity);
				break;
			}

			VectorCopy(trace.plane.normal, planes[numplanes]);
			numplanes++;

			//
			// modify original_velocity so it parallels all of the clip planes
			//

			for (i = 0; i < numplanes; i++)
			{
				PM_ClipVelocity(pml.velocity, planes[i], pml.velocity, 1.01f);
				for (j = 0; j < numplanes; j++)
					if (j != i)
					{
						if (DotProduct(pml.velocity, planes[j]) < 0)
							break; // not ok
					}
				if (j == numplanes)
					break;
			}

			if (i != numplanes)
			{ // go along this plane
			}
			else
			{ // go along the crease
				if (numplanes != 2)
				{
					//				Con_Printf ("clip velocity, numplanes == %i\n",numplanes);
					VectorCopy(vec3_origin, pml.velocity);
					break;
				}
				CrossProduct(planes[0], planes[1], dir);
				d = DotProduct(dir, pml.velocity);
				VectorScale(dir, d, pml.velocity);
			}

			//
			// if velocity is against the original velocity, stop dead
			// to avoid tiny occilations in sloping corners
			//
			if (DotProduct(pml.velocity, primal_velocity) <= 0)
			{
				VectorCopy(vec3_origin, pml.velocity);
				break;
			}
		}

		if (pm.s.pm_time != 0)
		{
			VectorCopy(primal_velocity, pml.velocity);
		}
	}

	/*
	==================
	PM_StepSlideMove
	
	==================
	*/
	public static void PM_StepSlideMove()
	{
		float[] start_o = { 0, 0, 0 }, start_v = { 0, 0, 0 };
		float[] down_o = { 0, 0, 0 }, down_v = { 0, 0, 0 };
		trace_t trace;
		float down_dist, up_dist;
		//	float [] 		delta;
		float[] up = { 0, 0, 0 }, down = { 0, 0, 0 };

		VectorCopy(pml.origin, start_o);
		VectorCopy(pml.velocity, start_v);

		PM_StepSlideMove_();

		VectorCopy(pml.origin, down_o);
		VectorCopy(pml.velocity, down_v);

		VectorCopy(start_o, up);
		up[2] += STEPSIZE;

		trace = pm.trace.trace(up, pm.mins, pm.maxs, up);
		if (trace.allsolid)
			return; // can't step up

		// try sliding above
		VectorCopy(up, pml.origin);
		VectorCopy(start_v, pml.velocity);

		PM_StepSlideMove_();

		// push down the final amount
		VectorCopy(pml.origin, down);
		down[2] -= STEPSIZE;
		trace = pm.trace.trace(pml.origin, pm.mins, pm.maxs, down);
		if (!trace.allsolid)
		{
			VectorCopy(trace.endpos, pml.origin);
		}

		VectorCopy(pml.origin, up);

		// decide which one went farther
		down_dist = (down_o[0] - start_o[0]) * (down_o[0] - start_o[0]) + (down_o[1] - start_o[1]) * (down_o[1] - start_o[1]);
		up_dist = (up[0] - start_o[0]) * (up[0] - start_o[0]) + (up[1] - start_o[1]) * (up[1] - start_o[1]);

		if (down_dist > up_dist || trace.plane.normal[2] < MIN_STEP_NORMAL)
		{
			VectorCopy(down_o, pml.origin);
			VectorCopy(down_v, pml.velocity);
			return;
		}
		//!! Special case
		// if we were walking along a plane, then we need to copy the Z over
		pml.velocity[2] = down_v[2];
	}

	/*
	==================
	PM_Friction
	
	Handles both ground friction and water friction
	==================
	*/
	public static void PM_Friction()
	{
		float vel[];
		float speed, newspeed, control;
		float friction;
		float drop;

		vel = pml.velocity;

		speed = (float) (Math.sqrt(vel[0] * vel[0] + vel[1] * vel[1] + vel[2] * vel[2]));
		if (speed < 1)
		{
			vel[0] = 0;
			vel[1] = 0;
			return;
		}

		drop = 0;

		// apply ground friction
		if ((pm.groundentity != null && pml.groundsurface != null && 0 == (pml.groundsurface.flags & SURF_SLICK)) || (pml.ladder))
		{
			friction = pm_friction;
			control = speed < pm_stopspeed ? pm_stopspeed : speed;
			drop += control * friction * pml.frametime;
		}

		// apply water friction
		if (pm.waterlevel != 0 && !pml.ladder)
			drop += speed * pm_waterfriction * pm.waterlevel * pml.frametime;

		// scale the velocity
		newspeed = speed - drop;
		if (newspeed < 0)
		{
			newspeed = 0;
		}
		newspeed /= speed;

		vel[0] = vel[0] * newspeed;
		vel[1] = vel[1] * newspeed;
		vel[2] = vel[2] * newspeed;
	}

	/*
	==============
	PM_Accelerate
	
	Handles user intended acceleration
	==============
	*/
	public static void PM_Accelerate(float[] wishdir, float wishspeed, float accel)
	{
		int i;
		float addspeed, accelspeed, currentspeed;

		currentspeed = DotProduct(pml.velocity, wishdir);
		addspeed = wishspeed - currentspeed;
		if (addspeed <= 0)
			return;
		accelspeed = accel * pml.frametime * wishspeed;
		if (accelspeed > addspeed)
			accelspeed = addspeed;

		for (i = 0; i < 3; i++)
			pml.velocity[i] += accelspeed * wishdir[i];
	}

	public static void PM_AirAccelerate(float[] wishdir, float wishspeed, float accel)
	{
		int i;
		float addspeed, accelspeed, currentspeed, wishspd = wishspeed;

		if (wishspd > 30)
			wishspd = 30;
		currentspeed = DotProduct(pml.velocity, wishdir);
		addspeed = wishspd - currentspeed;
		if (addspeed <= 0)
			return;
		accelspeed = accel * wishspeed * pml.frametime;
		if (accelspeed > addspeed)
			accelspeed = addspeed;

		for (i = 0; i < 3; i++)
			pml.velocity[i] += accelspeed * wishdir[i];
	}

	/*
	=============
	PM_AddCurrents
	=============
	*/
	public static void PM_AddCurrents(float[] wishvel)
	{
		float[] v = { 0, 0, 0 };
		float s;

		//
		// account for ladders
		//

		if (pml.ladder && Math.abs(pml.velocity[2]) <= 200)
		{
			if ((pm.viewangles[PITCH] <= -15) && (pm.cmd.forwardmove > 0))
				wishvel[2] = 200;
			else if ((pm.viewangles[PITCH] >= 15) && (pm.cmd.forwardmove > 0))
				wishvel[2] = -200;
			else if (pm.cmd.upmove > 0)
				wishvel[2] = 200;
			else if (pm.cmd.upmove < 0)
				wishvel[2] = -200;
			else
				wishvel[2] = 0;

			// limit horizontal speed when on a ladder
			if (wishvel[0] < -25)
				wishvel[0] = -25;
			else if (wishvel[0] > 25)
				wishvel[0] = 25;

			if (wishvel[1] < -25)
				wishvel[1] = -25;
			else if (wishvel[1] > 25)
				wishvel[1] = 25;
		}

		//
		// add water currents
		//

		if ((pm.watertype & MASK_CURRENT) != 0)
		{
			VectorClear(v);

			if ((pm.watertype & CONTENTS_CURRENT_0) != 0)
				v[0] += 1;
			if ((pm.watertype & CONTENTS_CURRENT_90) != 0)
				v[1] += 1;
			if ((pm.watertype & CONTENTS_CURRENT_180) != 0)
				v[0] -= 1;
			if ((pm.watertype & CONTENTS_CURRENT_270) != 0)
				v[1] -= 1;
			if ((pm.watertype & CONTENTS_CURRENT_UP) != 0)
				v[2] += 1;
			if ((pm.watertype & CONTENTS_CURRENT_DOWN) != 0)
				v[2] -= 1;

			s = pm_waterspeed;
			if ((pm.waterlevel == 1) && (pm.groundentity != null))
				s /= 2;

			VectorMA(wishvel, s, v, wishvel);
		}

		//
		// add conveyor belt velocities
		//

		if (pm.groundentity != null)
		{
			VectorClear(v);

			if ((pml.groundcontents & CONTENTS_CURRENT_0) != 0)
				v[0] += 1;
			if ((pml.groundcontents & CONTENTS_CURRENT_90) != 0)
				v[1] += 1;
			if ((pml.groundcontents & CONTENTS_CURRENT_180) != 0)
				v[0] -= 1;
			if ((pml.groundcontents & CONTENTS_CURRENT_270) != 0)
				v[1] -= 1;
			if ((pml.groundcontents & CONTENTS_CURRENT_UP) != 0)
				v[2] += 1;
			if ((pml.groundcontents & CONTENTS_CURRENT_DOWN) != 0)
				v[2] -= 1;

			VectorMA(wishvel, 100 /* pm.groundentity.speed */
			, v, wishvel);
		}
	}

	/*
	===================
	PM_WaterMove
	
	===================
	*/
	public static void PM_WaterMove()
	{
		int i;
		float[] wishvel = { 0, 0, 0 };
		float wishspeed;
		float[] wishdir = { 0, 0, 0 };

		//
		// user intentions
		//
		for (i = 0; i < 3; i++)
			wishvel[i] = pml.forward[i] * pm.cmd.forwardmove + pml.right[i] * pm.cmd.sidemove;

		if (0 == pm.cmd.forwardmove && 0 == pm.cmd.sidemove && 0 == pm.cmd.upmove)
			wishvel[2] -= 60; // drift towards bottom
		else
			wishvel[2] += pm.cmd.upmove;

		PM_AddCurrents(wishvel);

		VectorCopy(wishvel, wishdir);
		wishspeed = VectorNormalize(wishdir);

		if (wishspeed > pm_maxspeed)
		{
			VectorScale(wishvel, pm_maxspeed / wishspeed, wishvel);
			wishspeed = pm_maxspeed;
		}
		wishspeed *= 0.5;

		PM_Accelerate(wishdir, wishspeed, pm_wateraccelerate);

		PM_StepSlideMove();
	}

	/*
	===================
	PM_AirMove
	
	===================
	*/
	public static void PM_AirMove()
	{
		int i;
		float[] wishvel = { 0, 0, 0 };
		float fmove, smove;
		float[] wishdir = { 0, 0, 0 };
		float wishspeed;
		float maxspeed;

		fmove = pm.cmd.forwardmove;
		smove = pm.cmd.sidemove;

		for (i = 0; i < 2; i++)
			wishvel[i] = pml.forward[i] * fmove + pml.right[i] * smove;
		wishvel[2] = 0;

		PM_AddCurrents(wishvel);

		VectorCopy(wishvel, wishdir);
		wishspeed = VectorNormalize(wishdir);

		//
		// clamp to server defined max speed
		//
		maxspeed = (pm.s.pm_flags & PMF_DUCKED) != 0 ? pm_duckspeed : pm_maxspeed;

		if (wishspeed > maxspeed)
		{
			VectorScale(wishvel, maxspeed / wishspeed, wishvel);
			wishspeed = maxspeed;
		}

		if (pml.ladder)
		{
			PM_Accelerate(wishdir, wishspeed, pm_accelerate);
			if (0 == wishvel[2])
			{
				if (pml.velocity[2] > 0)
				{
					pml.velocity[2] -= pm.s.gravity * pml.frametime;
					if (pml.velocity[2] < 0)
						pml.velocity[2] = 0;
				}
				else
				{
					pml.velocity[2] += pm.s.gravity * pml.frametime;
					if (pml.velocity[2] > 0)
						pml.velocity[2] = 0;
				}
			}
			PM_StepSlideMove();
		}
		else if (pm.groundentity != null)
		{ // walking on ground
			pml.velocity[2] = 0; //!!! this is before the accel
			PM_Accelerate(wishdir, wishspeed, pm_accelerate);

			// PGM	-- fix for negative trigger_gravity fields
			//		pml.velocity[2] = 0;
			if (pm.s.gravity > 0)
				pml.velocity[2] = 0;
			else
				pml.velocity[2] -= pm.s.gravity * pml.frametime;
			// PGM

			if (0 == pml.velocity[0] && 0 == pml.velocity[1])
				return;
			PM_StepSlideMove();
		}
		else
		{ // not on ground, so little effect on velocity
			if (pm_airaccelerate != 0)
				PM_AirAccelerate(wishdir, wishspeed, pm_accelerate);
			else
				PM_Accelerate(wishdir, wishspeed, 1);
			// add gravity
			pml.velocity[2] -= pm.s.gravity * pml.frametime;
			PM_StepSlideMove();
		}
	}

	/*
	=============
	PM_CatagorizePosition
	=============
	*/
	public static void PM_CatagorizePosition()
	{
		float[] point = { 0, 0, 0 };
		int cont;
		trace_t trace;
		int sample1;
		int sample2;

		// if the player hull point one unit down is solid, the player
		// is on ground

		// see if standing on something solid	
		point[0] = pml.origin[0];
		point[1] = pml.origin[1];
		point[2] = pml.origin[2] - 0.25f;
		if (pml.velocity[2] > 180) //!!ZOID changed from 100 to 180 (ramp accel)
		{
			pm.s.pm_flags &= ~PMF_ON_GROUND;
			pm.groundentity = null;
		}
		else
		{
			trace = pm.trace.trace(pml.origin, pm.mins, pm.maxs, point);
			pml.groundplane = trace.plane;
			pml.groundsurface = trace.surface;
			pml.groundcontents = trace.contents;

			if (null == trace.ent || (trace.plane.normal[2] < 0.7 && !trace.startsolid))
			{
				pm.groundentity = null;
				pm.s.pm_flags &= ~PMF_ON_GROUND;
			}
			else
			{
				pm.groundentity = trace.ent;
				// hitting solid ground will end a waterjump
				if ((pm.s.pm_flags & PMF_TIME_WATERJUMP) != 0)
				{
					pm.s.pm_flags &= ~(PMF_TIME_WATERJUMP | PMF_TIME_LAND | PMF_TIME_TELEPORT);
					pm.s.pm_time = 0;
				}

				if (0 == (pm.s.pm_flags & PMF_ON_GROUND))
				{ 	// just hit the ground
					pm.s.pm_flags |= PMF_ON_GROUND;
					// don't do landing time if we were just going down a slope
					if (pml.velocity[2] < -200)
					{
						pm.s.pm_flags |= PMF_TIME_LAND;
						// don't allow another jump for a little while
						if (pml.velocity[2] < -400)
							pm.s.pm_time = 25;
						else
							pm.s.pm_time = 18;
					}
				}
			}

			if (pm.numtouch < MAXTOUCH && trace.ent != null)
			{
				pm.touchents[pm.numtouch] = trace.ent;
				pm.numtouch++;
			}
		}

		//
		// get waterlevel, accounting for ducking
		//
		pm.waterlevel = 0;
		pm.watertype = 0;

		sample2 = (int) (pm.viewheight - pm.mins[2]);
		sample1 = sample2 / 2;

		point[2] = pml.origin[2] + pm.mins[2] + 1;
		cont = pm.pointcontents.pointcontents(point);

		if ((cont & MASK_WATER) != 0)
		{
			pm.watertype = cont;
			pm.waterlevel = 1;
			point[2] = pml.origin[2] + pm.mins[2] + sample1;
			cont = pm.pointcontents.pointcontents(point);
			if ((cont & MASK_WATER) != 0)
			{
				pm.waterlevel = 2;
				point[2] = pml.origin[2] + pm.mins[2] + sample2;
				cont = pm.pointcontents.pointcontents(point);
				if ((cont & MASK_WATER) != 0)
					pm.waterlevel = 3;
			}
		}

	}

	/*
	=============
	PM_CheckJump
	=============
	*/
	public static void PM_CheckJump()
	{
		if ((pm.s.pm_flags & PMF_TIME_LAND) != 0)
		{ // hasn't been long enough since landing to jump again
			return;
		}

		if (pm.cmd.upmove < 10)
		{ // not holding jump
			pm.s.pm_flags &= ~PMF_JUMP_HELD;
			return;
		}

		// must wait for jump to be released
		if ((pm.s.pm_flags & PMF_JUMP_HELD) != 0)
			return;

		if (pm.s.pm_type == PM_DEAD)
			return;

		if (pm.waterlevel >= 2)
		{ // swimming, not jumping
			pm.groundentity = null;

			if (pml.velocity[2] <= -300)
				return;

			if (pm.watertype == CONTENTS_WATER)
				pml.velocity[2] = 100;
			else if (pm.watertype == CONTENTS_SLIME)
				pml.velocity[2] = 80;
			else
				pml.velocity[2] = 50;
			return;
		}

		if (pm.groundentity == null)
			return; // in air, so no effect

		pm.s.pm_flags |= PMF_JUMP_HELD;

		pm.groundentity = null;
		pml.velocity[2] += 270;
		if (pml.velocity[2] < 270)
			pml.velocity[2] = 270;
	}

	/*
	=============
	PM_CheckSpecialMovement
	=============
	*/
	public static void PM_CheckSpecialMovement()
	{
		float[] spot = { 0, 0, 0 };
		int cont;
		float[] flatforward = { 0, 0, 0 };
		trace_t trace;

		if (pm.s.pm_time != 0)
			return;

		pml.ladder = false;

		// check for ladder
		flatforward[0] = pml.forward[0];
		flatforward[1] = pml.forward[1];
		flatforward[2] = 0;
		VectorNormalize(flatforward);

		VectorMA(pml.origin, 1, flatforward, spot);
		trace = pm.trace.trace(pml.origin, pm.mins, pm.maxs, spot);
		if ((trace.fraction < 1) && (trace.contents & CONTENTS_LADDER) != 0)
			pml.ladder = true;

		// check for water jump
		if (pm.waterlevel != 2)
			return;

		VectorMA(pml.origin, 30, flatforward, spot);
		spot[2] += 4;
		cont = pm.pointcontents.pointcontents(spot);
		if (0 == (cont & CONTENTS_SOLID))
			return;

		spot[2] += 16;
		cont = pm.pointcontents.pointcontents(spot);
		if (cont != 0)
			return;
		// jump out of water
		VectorScale(flatforward, 50, pml.velocity);
		pml.velocity[2] = 350;

		pm.s.pm_flags |= PMF_TIME_WATERJUMP;
		pm.s.pm_time = -1; // was 255
	}

	/*
	===============
	PM_FlyMove
	===============
	*/
	public static void PM_FlyMove(boolean doclip)
	{
		float speed, drop, friction, control, newspeed;
		float currentspeed, addspeed, accelspeed;
		int i;
		float[] wishvel = { 0, 0, 0 };
		float fmove, smove;
		float[] wishdir = { 0, 0, 0 };
		float wishspeed;
		float[] end = { 0, 0, 0 };
		trace_t trace;

		pm.viewheight = 22;

		// friction

		speed = VectorLength(pml.velocity);
		if (speed < 1)
		{
			VectorCopy(vec3_origin, pml.velocity);
		}
		else
		{
			drop = 0;

			friction = pm_friction * 1.5f; // extra friction
			control = speed < pm_stopspeed ? pm_stopspeed : speed;
			drop += control * friction * pml.frametime;

			// scale the velocity
			newspeed = speed - drop;
			if (newspeed < 0)
				newspeed = 0;
			newspeed /= speed;

			VectorScale(pml.velocity, newspeed, pml.velocity);
		}

		// accelerate
		fmove = pm.cmd.forwardmove;
		smove = pm.cmd.sidemove;

		VectorNormalize(pml.forward);
		VectorNormalize(pml.right);

		for (i = 0; i < 3; i++)
			wishvel[i] = pml.forward[i] * fmove + pml.right[i] * smove;
		wishvel[2] += pm.cmd.upmove;

		VectorCopy(wishvel, wishdir);
		wishspeed = VectorNormalize(wishdir);

		//
		// clamp to server defined max speed
		//
		if (wishspeed > pm_maxspeed)
		{
			VectorScale(wishvel, pm_maxspeed / wishspeed, wishvel);
			wishspeed = pm_maxspeed;
		}

		currentspeed = DotProduct(pml.velocity, wishdir);
		addspeed = wishspeed - currentspeed;
		if (addspeed <= 0)
			return;
		accelspeed = pm_accelerate * pml.frametime * wishspeed;
		if (accelspeed > addspeed)
			accelspeed = addspeed;

		for (i = 0; i < 3; i++)
			pml.velocity[i] += accelspeed * wishdir[i];

		if (doclip)
		{
			for (i = 0; i < 3; i++)
				end[i] = pml.origin[i] + pml.frametime * pml.velocity[i];

			trace = pm.trace.trace(pml.origin, pm.mins, pm.maxs, end);

			VectorCopy(trace.endpos, pml.origin);
		}
		else
		{
			// move
			VectorMA(pml.origin, pml.frametime, pml.velocity, pml.origin);
		}
	}

	/*
	==============
	PM_CheckDuck
	
	Sets mins, maxs, and pm.viewheight
	==============
	*/
	public static void PM_CheckDuck()
	{
		trace_t trace;

		pm.mins[0] = -16;
		pm.mins[1] = -16;

		pm.maxs[0] = 16;
		pm.maxs[1] = 16;

		if (pm.s.pm_type == PM_GIB)
		{
			pm.mins[2] = 0;
			pm.maxs[2] = 16;
			pm.viewheight = 8;
			return;
		}

		pm.mins[2] = -24;

		if (pm.s.pm_type == PM_DEAD)
		{
			pm.s.pm_flags |= PMF_DUCKED;
		}
		else if (pm.cmd.upmove < 0 && (pm.s.pm_flags & PMF_ON_GROUND) != 0)
		{ // duck
			pm.s.pm_flags |= PMF_DUCKED;
		}
		else
		{ // stand up if possible
			if ((pm.s.pm_flags & PMF_DUCKED) != 0)
			{
				// try to stand up
				pm.maxs[2] = 32;
				trace = pm.trace.trace(pml.origin, pm.mins, pm.maxs, pml.origin);
				if (!trace.allsolid)
					pm.s.pm_flags &= ~PMF_DUCKED;
			}
		}

		if ((pm.s.pm_flags & PMF_DUCKED) != 0)
		{
			pm.maxs[2] = 4;
			pm.viewheight = -2;
		}
		else
		{
			pm.maxs[2] = 32;
			pm.viewheight = 22;
		}
	}

	/*
	==============
	PM_DeadMove
	==============
	*/
	public static void PM_DeadMove()
	{
		float forward;

		if (null == pm.groundentity)
			return;

		// extra friction

		forward = VectorLength(pml.velocity);
		forward -= 20;
		if (forward <= 0)
		{
			VectorClear(pml.velocity);
		}
		else
		{
			VectorNormalize(pml.velocity);
			VectorScale(pml.velocity, forward, pml.velocity);
		}
	}

	public static boolean PM_GoodPosition()
	{
		trace_t trace;
		float[] origin = { 0, 0, 0 }, end = { 0, 0, 0 };
		int i;

		if (pm.s.pm_type == PM_SPECTATOR)
			return true;

		for (i = 0; i < 3; i++)
			origin[i] = end[i] = pm.s.origin[i] * 0.125f;
		trace = pm.trace.trace(origin, pm.mins, pm.maxs, end);

		return !trace.allsolid;
	}

	/*
	================
	PM_SnapPosition
	
	On exit, the origin will have a value that is pre-quantized to the 0.125
	precision of the network channel and in a valid position.
	================
	*/
	// try all single bits first
	static int jitterbits[] = { 0, 4, 1, 2, 3, 5, 6, 7 };
	public static void PM_SnapPosition()
	{
		int sign[] = { 0, 0, 0 };
		int i, j, bits;
		short base[] = { 0, 0, 0 };

		// snap velocity to eigths
		for (i = 0; i < 3; i++)
			pm.s.velocity[i] = (short) (pml.velocity[i] * 8);

		for (i = 0; i < 3; i++)
		{
			if (pml.origin[i] >= 0)
				sign[i] = 1;
			else
				sign[i] = -1;
			pm.s.origin[i] = (short) (pml.origin[i] * 8);
			if (pm.s.origin[i] * 0.125 == pml.origin[i])
				sign[i] = 0;
		}
		VectorCopy(pm.s.origin, base);

		// try all combinations
		for (j = 0; j < 8; j++)
		{
			bits = jitterbits[j];
			VectorCopy(base, pm.s.origin);
			for (i = 0; i < 3; i++)
				if ((bits & (1 << i)) != 0)
					pm.s.origin[i] += sign[i];

			if (PM_GoodPosition())
				return;
		}

		// go back to the last position
		VectorCopy(pml.previous_origin, pm.s.origin);
		//	Com_DPrintf ("using previous_origin\n");
	}

	/*
	================
	PM_InitialSnapPosition
	
	================
	*/
	static int offset[] = { 0, -1, 1 };
	public static void PM_InitialSnapPosition()
	{
		int x, y, z;
		short base[] = { 0, 0, 0 };

		VectorCopy(pm.s.origin, base);

		for (z = 0; z < 3; z++)
		{
			pm.s.origin[2] = (short) (base[2] + offset[z]);
			for (y = 0; y < 3; y++)
			{
				pm.s.origin[1] = (short) (base[1] + offset[y]);
				for (x = 0; x < 3; x++)
				{
					pm.s.origin[0] = (short) (base[0] + offset[x]);
					if (PM_GoodPosition())
					{
						pml.origin[0] = pm.s.origin[0] * 0.125f;
						pml.origin[1] = pm.s.origin[1] * 0.125f;
						pml.origin[2] = pm.s.origin[2] * 0.125f;
						VectorCopy(pm.s.origin, pml.previous_origin);
						return;
					}
				}
			}
		}

		Com.DPrintf("Bad InitialSnapPosition\n");
	}

	/*
	================
	PM_ClampAngles
	
	================
	*/
	public static void PM_ClampAngles()
	{
		short temp;
		int i;

		if ((pm.s.pm_flags & PMF_TIME_TELEPORT) != 0)
		{
			pm.viewangles[YAW] = SHORT2ANGLE(pm.cmd.angles[YAW] + pm.s.delta_angles[YAW]);
			pm.viewangles[PITCH] = 0;
			pm.viewangles[ROLL] = 0;
		}
		else
		{
			// circularly clamp the angles with deltas
			for (i = 0; i < 3; i++)
			{
				temp = (short) (pm.cmd.angles[i] + pm.s.delta_angles[i]);
				pm.viewangles[i] = SHORT2ANGLE(temp);
			}

			// don't let the player look up or down more than 90 degrees
			if (pm.viewangles[PITCH] > 89 && pm.viewangles[PITCH] < 180)
				pm.viewangles[PITCH] = 89;
			else if (pm.viewangles[PITCH] < 271 && pm.viewangles[PITCH] >= 180)
				pm.viewangles[PITCH] = 271;
		}
		AngleVectors(pm.viewangles, pml.forward, pml.right, pml.up);
	}

	/*
	================
	Pmove
	
	Can be called by either the server or the client
	================
	*/
	public static void Pmove(pmove_t pmove)
	{
		pm = pmove;

		// clear results
		pm.numtouch = 0;
		VectorClear(pm.viewangles);
		pm.viewheight = 0;
		pm.groundentity = null;
		pm.watertype = 0;
		pm.waterlevel = 0;

		// clear all pmove local vars
		pml = new pml_t();

		// convert origin and velocity to float values
		pml.origin[0] = pm.s.origin[0] * 0.125f;
		pml.origin[1] = pm.s.origin[1] * 0.125f;
		pml.origin[2] = pm.s.origin[2] * 0.125f;

		pml.velocity[0] = pm.s.velocity[0] * 0.125f;
		pml.velocity[1] = pm.s.velocity[1] * 0.125f;
		pml.velocity[2] = pm.s.velocity[2] * 0.125f;

		// save old org in case we get stuck
		VectorCopy(pm.s.origin, pml.previous_origin);

		pml.frametime = (pm.cmd.msec & 0xFF) * 0.001f;

		PM_ClampAngles();

		if (pm.s.pm_type == PM_SPECTATOR)
		{
			PM_FlyMove(false);
			PM_SnapPosition();
			return;
		}

		if (pm.s.pm_type >= PM_DEAD)
		{
			pm.cmd.forwardmove = 0;
			pm.cmd.sidemove = 0;
			pm.cmd.upmove = 0;
		}

		if (pm.s.pm_type == PM_FREEZE)
			return; // no movement at all

		// set mins, maxs, and viewheight
		PM_CheckDuck();

		if (pm.snapinitial)
			PM_InitialSnapPosition();

		// set groundentity, watertype, and waterlevel
		PM_CatagorizePosition();

		if (pm.s.pm_type == PM_DEAD)
			PM_DeadMove();

		PM_CheckSpecialMovement();

		// drop timing counter
		if (pm.s.pm_time != 0)
		{
			int msec;

			// TOD o bugfix cwei
			msec = pm.cmd.msec >>> 3;
			if (msec == 0)
				msec = 1;
			if (msec >= (pm.s.pm_time & 0xFF))
			{
				pm.s.pm_flags &= ~(PMF_TIME_WATERJUMP | PMF_TIME_LAND | PMF_TIME_TELEPORT);
				pm.s.pm_time = 0;
			}
			else
				pm.s.pm_time = (byte)((pm.s.pm_time & 0xFF) - msec);
		}

		if ((pm.s.pm_flags & PMF_TIME_TELEPORT) != 0)
		{ // teleport pause stays exactly in place
		}
		else if ((pm.s.pm_flags & PMF_TIME_WATERJUMP) != 0)
		{ // waterjump has no control, but falls
			pml.velocity[2] -= pm.s.gravity * pml.frametime;
			if (pml.velocity[2] < 0)
			{ // cancel as soon as we are falling down again
				pm.s.pm_flags &= ~(PMF_TIME_WATERJUMP | PMF_TIME_LAND | PMF_TIME_TELEPORT);
				pm.s.pm_time = 0;
			}

			PM_StepSlideMove();
		}
		else
		{
			PM_CheckJump();

			PM_Friction();

			if (pm.waterlevel >= 2)
				PM_WaterMove();
			else
			{
				float[] angles={0,0,0};

				VectorCopy(pm.viewangles, angles);
				if (angles[PITCH] > 180)
					angles[PITCH] = angles[PITCH] - 360;
				angles[PITCH] /= 3;

				AngleVectors(angles, pml.forward, pml.right, pml.up);

				PM_AirMove();
			}
		}

		// set groundentity, watertype, and waterlevel for final spot
		PM_CatagorizePosition();

		PM_SnapPosition();
	}
}