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bg_pmove.c
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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
This file is part of Quake III Arena source code.
Quake III Arena source code 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.
Quake III Arena source code 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 Quake III Arena source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
//
// bg_pmove.c -- both games player movement code
// takes a playerstate and a usercmd as input and returns a modifed playerstate
#include "../qcommon/q_shared.h"
#include "bg_public.h"
#include "bg_local.h"
pmove_t *pm;
pml_t pml;
// movement parameters
float pm_stopspeed = 100.0f;
float pm_duckScale = 0.25f;
float pm_swimScale = 0.50f;
float pm_accelerate = 10.0f;
float pm_airaccelerate = 1.0f;
float pm_wateraccelerate = 4.0f;
float pm_flyaccelerate = 8.0f;
float pm_friction = 6.0f;
float pm_waterfriction = 1.0f;
float pm_flightfriction = 3.0f;
float pm_spectatorfriction = 5.0f;
int c_pmove = 0;
/*
===============
PM_AddEvent
===============
*/
void PM_AddEvent( int newEvent ) {
BG_AddPredictableEventToPlayerstate( newEvent, 0, pm->ps );
}
/*
===============
PM_AddTouchEnt
===============
*/
void PM_AddTouchEnt( int entityNum ) {
int i;
if ( entityNum == ENTITYNUM_WORLD ) {
return;
}
if ( pm->numtouch == MAXTOUCH ) {
return;
}
// see if it is already added
for ( i = 0 ; i < pm->numtouch ; i++ ) {
if ( pm->touchents[ i ] == entityNum ) {
return;
}
}
// add it
pm->touchents[pm->numtouch] = entityNum;
pm->numtouch++;
}
/*
===================
PM_StartTorsoAnim
===================
*/
static void PM_StartTorsoAnim( int anim ) {
if ( pm->ps->pm_type >= PM_DEAD ) {
return;
}
pm->ps->torsoAnim = ( ( pm->ps->torsoAnim & ANIM_TOGGLEBIT ) ^ ANIM_TOGGLEBIT )
| anim;
}
static void PM_StartLegsAnim( int anim ) {
if ( pm->ps->pm_type >= PM_DEAD ) {
return;
}
if ( pm->ps->legsTimer > 0 ) {
return; // a high priority animation is running
}
pm->ps->legsAnim = ( ( pm->ps->legsAnim & ANIM_TOGGLEBIT ) ^ ANIM_TOGGLEBIT )
| anim;
}
static void PM_ContinueLegsAnim( int anim ) {
if ( ( pm->ps->legsAnim & ~ANIM_TOGGLEBIT ) == anim ) {
return;
}
if ( pm->ps->legsTimer > 0 ) {
return; // a high priority animation is running
}
PM_StartLegsAnim( anim );
}
static void PM_ContinueTorsoAnim( int anim ) {
if ( ( pm->ps->torsoAnim & ~ANIM_TOGGLEBIT ) == anim ) {
return;
}
if ( pm->ps->torsoTimer > 0 ) {
return; // a high priority animation is running
}
PM_StartTorsoAnim( anim );
}
static void PM_ForceLegsAnim( int anim ) {
pm->ps->legsTimer = 0;
PM_StartLegsAnim( anim );
}
/*
==================
PM_ClipVelocity
Slide off of the impacting surface
==================
*/
void PM_ClipVelocity( vec3_t in, vec3_t normal, vec3_t out, float overbounce ) {
float backoff;
float change;
int i;
backoff = DotProduct (in, normal);
if ( backoff < 0 ) {
backoff *= overbounce;
} else {
backoff /= overbounce;
}
for ( i=0 ; i<3 ; i++ ) {
change = normal[i]*backoff;
out[i] = in[i] - change;
}
}
/*
==================
PM_Friction
Handles both ground friction and water friction
==================
*/
static void PM_Friction( void ) {
vec3_t vec;
float *vel;
float speed, newspeed, control;
float drop;
vel = pm->ps->velocity;
VectorCopy( vel, vec );
if ( pml.walking ) {
vec[2] = 0; // ignore slope movement
}
speed = VectorLength(vec);
if (speed < 1) {
vel[0] = 0;
vel[1] = 0; // allow sinking underwater
// FIXME: still have z friction underwater?
return;
}
drop = 0;
// apply ground friction
if ( pm->waterlevel <= 1 ) {
if ( pml.walking && !(pml.groundTrace.surfaceFlags & SURF_SLICK) ) {
// if getting knocked back, no friction
if ( ! (pm->ps->pm_flags & PMF_TIME_KNOCKBACK) ) {
control = speed < pm_stopspeed ? pm_stopspeed : speed;
drop += control*pm_friction*pml.frametime;
}
}
}
// apply water friction even if just wading
if ( pm->waterlevel ) {
drop += speed*pm_waterfriction*pm->waterlevel*pml.frametime;
}
// apply flying friction
if ( pm->ps->powerups[PW_FLIGHT]) {
drop += speed*pm_flightfriction*pml.frametime;
}
if ( pm->ps->pm_type == PM_SPECTATOR) {
drop += speed*pm_spectatorfriction*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
==============
*/
static void PM_Accelerate( vec3_t wishdir, float wishspeed, float accel ) {
#if 1
// q2 style
int i;
float addspeed, accelspeed, currentspeed;
currentspeed = DotProduct (pm->ps->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++) {
pm->ps->velocity[i] += accelspeed*wishdir[i];
}
#else
// proper way (avoids strafe jump maxspeed bug), but feels bad
vec3_t wishVelocity;
vec3_t pushDir;
float pushLen;
float canPush;
VectorScale( wishdir, wishspeed, wishVelocity );
VectorSubtract( wishVelocity, pm->ps->velocity, pushDir );
pushLen = VectorNormalize( pushDir );
canPush = accel*pml.frametime*wishspeed;
if (canPush > pushLen) {
canPush = pushLen;
}
VectorMA( pm->ps->velocity, canPush, pushDir, pm->ps->velocity );
#endif
}
/*
============
PM_CmdScale
Returns the scale factor to apply to cmd movements
This allows the clients to use axial -127 to 127 values for all directions
without getting a sqrt(2) distortion in speed.
============
*/
static float PM_CmdScale( usercmd_t *cmd ) {
int max;
float total;
float scale;
max = abs( cmd->forwardmove );
if ( abs( cmd->rightmove ) > max ) {
max = abs( cmd->rightmove );
}
if ( abs( cmd->upmove ) > max ) {
max = abs( cmd->upmove );
}
if ( !max ) {
return 0;
}
total = sqrt( cmd->forwardmove * cmd->forwardmove
+ cmd->rightmove * cmd->rightmove + cmd->upmove * cmd->upmove );
scale = (float)pm->ps->speed * max / ( 127.0 * total );
return scale;
}
/*
================
PM_SetMovementDir
Determine the rotation of the legs relative
to the facing dir
================
*/
static void PM_SetMovementDir( void ) {
if ( pm->cmd.forwardmove || pm->cmd.rightmove ) {
if ( pm->cmd.rightmove == 0 && pm->cmd.forwardmove > 0 ) {
pm->ps->movementDir = 0;
} else if ( pm->cmd.rightmove < 0 && pm->cmd.forwardmove > 0 ) {
pm->ps->movementDir = 1;
} else if ( pm->cmd.rightmove < 0 && pm->cmd.forwardmove == 0 ) {
pm->ps->movementDir = 2;
} else if ( pm->cmd.rightmove < 0 && pm->cmd.forwardmove < 0 ) {
pm->ps->movementDir = 3;
} else if ( pm->cmd.rightmove == 0 && pm->cmd.forwardmove < 0 ) {
pm->ps->movementDir = 4;
} else if ( pm->cmd.rightmove > 0 && pm->cmd.forwardmove < 0 ) {
pm->ps->movementDir = 5;
} else if ( pm->cmd.rightmove > 0 && pm->cmd.forwardmove == 0 ) {
pm->ps->movementDir = 6;
} else if ( pm->cmd.rightmove > 0 && pm->cmd.forwardmove > 0 ) {
pm->ps->movementDir = 7;
}
} else {
// if they aren't actively going directly sideways,
// change the animation to the diagonal so they
// don't stop too crooked
if ( pm->ps->movementDir == 2 ) {
pm->ps->movementDir = 1;
} else if ( pm->ps->movementDir == 6 ) {
pm->ps->movementDir = 7;
}
}
}
/*
=============
PM_CheckJump
=============
*/
static qboolean PM_CheckJump( void ) {
if ( pm->ps->pm_flags & PMF_RESPAWNED ) {
return qfalse; // don't allow jump until all buttons are up
}
if ( pm->cmd.upmove < 10 ) {
// not holding jump
return qfalse;
}
// must wait for jump to be released
if ( pm->ps->pm_flags & PMF_JUMP_HELD ) {
// clear upmove so cmdscale doesn't lower running speed
pm->cmd.upmove = 0;
return qfalse;
}
pml.groundPlane = qfalse; // jumping away
pml.walking = qfalse;
pm->ps->pm_flags |= PMF_JUMP_HELD;
pm->ps->groundEntityNum = ENTITYNUM_NONE;
pm->ps->velocity[2] = JUMP_VELOCITY;
PM_AddEvent( EV_JUMP );
if ( pm->cmd.forwardmove >= 0 ) {
PM_ForceLegsAnim( LEGS_JUMP );
pm->ps->pm_flags &= ~PMF_BACKWARDS_JUMP;
} else {
PM_ForceLegsAnim( LEGS_JUMPB );
pm->ps->pm_flags |= PMF_BACKWARDS_JUMP;
}
return qtrue;
}
/*
=============
PM_CheckWaterJump
=============
*/
static qboolean PM_CheckWaterJump( void ) {
vec3_t spot;
int cont;
vec3_t flatforward;
if (pm->ps->pm_time) {
return qfalse;
}
// check for water jump
if ( pm->waterlevel != 2 ) {
return qfalse;
}
flatforward[0] = pml.forward[0];
flatforward[1] = pml.forward[1];
flatforward[2] = 0;
VectorNormalize (flatforward);
VectorMA (pm->ps->origin, 30, flatforward, spot);
spot[2] += 4;
cont = pm->pointcontents (spot, pm->ps->clientNum );
if ( !(cont & CONTENTS_SOLID) ) {
return qfalse;
}
spot[2] += 16;
cont = pm->pointcontents (spot, pm->ps->clientNum );
if ( cont & (CONTENTS_SOLID|CONTENTS_PLAYERCLIP|CONTENTS_BODY) ) {
return qfalse;
}
// jump out of water
VectorScale (pml.forward, 200, pm->ps->velocity);
pm->ps->velocity[2] = 350;
pm->ps->pm_flags |= PMF_TIME_WATERJUMP;
pm->ps->pm_time = 2000;
return qtrue;
}
//============================================================================
/*
===================
PM_WaterJumpMove
Flying out of the water
===================
*/
static void PM_WaterJumpMove( void ) {
// waterjump has no control, but falls
PM_StepSlideMove( qtrue );
pm->ps->velocity[2] -= pm->ps->gravity * pml.frametime;
if (pm->ps->velocity[2] < 0) {
// cancel as soon as we are falling down again
pm->ps->pm_flags &= ~PMF_ALL_TIMES;
pm->ps->pm_time = 0;
}
}
/*
===================
PM_WaterMove
===================
*/
static void PM_WaterMove( void ) {
int i;
vec3_t wishvel;
float wishspeed;
vec3_t wishdir;
float scale;
float vel;
if ( PM_CheckWaterJump() ) {
PM_WaterJumpMove();
return;
}
#if 0
// jump = head for surface
if ( pm->cmd.upmove >= 10 ) {
if (pm->ps->velocity[2] > -300) {
if ( pm->watertype & CONTENTS_WATER ) {
pm->ps->velocity[2] = 100;
} else if ( pm->watertype & CONTENTS_SLIME ) {
pm->ps->velocity[2] = 80;
} else {
pm->ps->velocity[2] = 50;
}
}
}
#endif
PM_Friction ();
scale = PM_CmdScale( &pm->cmd );
//
// user intentions
//
if ( !scale ) {
wishvel[0] = 0;
wishvel[1] = 0;
wishvel[2] = -60; // sink towards bottom
} else {
for (i=0 ; i<3 ; i++)
wishvel[i] = scale * pml.forward[i]*pm->cmd.forwardmove + scale * pml.right[i]*pm->cmd.rightmove;
wishvel[2] += scale * pm->cmd.upmove;
}
VectorCopy (wishvel, wishdir);
wishspeed = VectorNormalize(wishdir);
if ( wishspeed > pm->ps->speed * pm_swimScale ) {
wishspeed = pm->ps->speed * pm_swimScale;
}
PM_Accelerate (wishdir, wishspeed, pm_wateraccelerate);
// make sure we can go up slopes easily under water
if ( pml.groundPlane && DotProduct( pm->ps->velocity, pml.groundTrace.plane.normal ) < 0 ) {
vel = VectorLength(pm->ps->velocity);
// slide along the ground plane
PM_ClipVelocity (pm->ps->velocity, pml.groundTrace.plane.normal,
pm->ps->velocity, OVERCLIP );
VectorNormalize(pm->ps->velocity);
VectorScale(pm->ps->velocity, vel, pm->ps->velocity);
}
PM_SlideMove( qfalse );
}
#ifdef MISSIONPACK
/*
===================
PM_InvulnerabilityMove
Only with the invulnerability powerup
===================
*/
static void PM_InvulnerabilityMove( void ) {
pm->cmd.forwardmove = 0;
pm->cmd.rightmove = 0;
pm->cmd.upmove = 0;
VectorClear(pm->ps->velocity);
}
#endif
/*
===================
PM_FlyMove
Only with the flight powerup
===================
*/
static void PM_FlyMove( void ) {
int i;
vec3_t wishvel;
float wishspeed;
vec3_t wishdir;
float scale;
// normal slowdown
PM_Friction ();
scale = PM_CmdScale( &pm->cmd );
//
// user intentions
//
if ( !scale ) {
wishvel[0] = 0;
wishvel[1] = 0;
wishvel[2] = 0;
} else {
for (i=0 ; i<3 ; i++) {
wishvel[i] = scale * pml.forward[i]*pm->cmd.forwardmove + scale * pml.right[i]*pm->cmd.rightmove;
}
wishvel[2] += scale * pm->cmd.upmove;
}
VectorCopy (wishvel, wishdir);
wishspeed = VectorNormalize(wishdir);
PM_Accelerate (wishdir, wishspeed, pm_flyaccelerate);
PM_StepSlideMove( qfalse );
}
/*
===================
PM_AirMove
===================
*/
static void PM_AirMove( void ) {
int i;
vec3_t wishvel;
float fmove, smove;
vec3_t wishdir;
float wishspeed;
float scale;
usercmd_t cmd;
PM_Friction();
fmove = pm->cmd.forwardmove;
smove = pm->cmd.rightmove;
cmd = pm->cmd;
scale = PM_CmdScale( &cmd );
// set the movementDir so clients can rotate the legs for strafing
PM_SetMovementDir();
// project moves down to flat plane
pml.forward[2] = 0;
pml.right[2] = 0;
VectorNormalize (pml.forward);
VectorNormalize (pml.right);
for ( i = 0 ; i < 2 ; i++ ) {
wishvel[i] = pml.forward[i]*fmove + pml.right[i]*smove;
}
wishvel[2] = 0;
VectorCopy (wishvel, wishdir);
wishspeed = VectorNormalize(wishdir);
wishspeed *= scale;
// not on ground, so little effect on velocity
PM_Accelerate (wishdir, wishspeed, pm_airaccelerate);
// we may have a ground plane that is very steep, even
// though we don't have a groundentity
// slide along the steep plane
if ( pml.groundPlane ) {
PM_ClipVelocity (pm->ps->velocity, pml.groundTrace.plane.normal,
pm->ps->velocity, OVERCLIP );
}
#if 0
//ZOID: If we are on the grapple, try stair-stepping
//this allows a player to use the grapple to pull himself
//over a ledge
if (pm->ps->pm_flags & PMF_GRAPPLE_PULL)
PM_StepSlideMove ( qtrue );
else
PM_SlideMove ( qtrue );
#endif
PM_StepSlideMove ( qtrue );
}
/*
===================
PM_GrappleMove
===================
*/
static void PM_GrappleMove( void ) {
vec3_t vel, v;
float vlen;
VectorScale(pml.forward, -16, v);
VectorAdd(pm->ps->grapplePoint, v, v);
VectorSubtract(v, pm->ps->origin, vel);
vlen = VectorLength(vel);
VectorNormalize( vel );
if (vlen <= 100)
VectorScale(vel, 10 * vlen, vel);
else
VectorScale(vel, 800, vel);
VectorCopy(vel, pm->ps->velocity);
pml.groundPlane = qfalse;
}
/*
===================
PM_WalkMove
===================
*/
static void PM_WalkMove( void ) {
int i;
vec3_t wishvel;
float fmove, smove;
vec3_t wishdir;
float wishspeed;
float scale;
usercmd_t cmd;
float accelerate;
float vel;
if ( pm->waterlevel > 2 && DotProduct( pml.forward, pml.groundTrace.plane.normal ) > 0 ) {
// begin swimming
PM_WaterMove();
return;
}
if ( PM_CheckJump () ) {
// jumped away
if ( pm->waterlevel > 1 ) {
PM_WaterMove();
} else {
PM_AirMove();
}
return;
}
PM_Friction ();
fmove = pm->cmd.forwardmove;
smove = pm->cmd.rightmove;
cmd = pm->cmd;
scale = PM_CmdScale( &cmd );
// set the movementDir so clients can rotate the legs for strafing
PM_SetMovementDir();
// project moves down to flat plane
pml.forward[2] = 0;
pml.right[2] = 0;
// project the forward and right directions onto the ground plane
PM_ClipVelocity (pml.forward, pml.groundTrace.plane.normal, pml.forward, OVERCLIP );
PM_ClipVelocity (pml.right, pml.groundTrace.plane.normal, pml.right, OVERCLIP );
//
VectorNormalize (pml.forward);
VectorNormalize (pml.right);
for ( i = 0 ; i < 3 ; i++ ) {
wishvel[i] = pml.forward[i]*fmove + pml.right[i]*smove;
}
// when going up or down slopes the wish velocity should Not be zero
// wishvel[2] = 0;
VectorCopy (wishvel, wishdir);
wishspeed = VectorNormalize(wishdir);
wishspeed *= scale;
// clamp the speed lower if ducking
if ( pm->ps->pm_flags & PMF_DUCKED ) {
if ( wishspeed > pm->ps->speed * pm_duckScale ) {
wishspeed = pm->ps->speed * pm_duckScale;
}
}
// clamp the speed lower if wading or walking on the bottom
if ( pm->waterlevel ) {
float waterScale;
waterScale = pm->waterlevel / 3.0;
waterScale = 1.0 - ( 1.0 - pm_swimScale ) * waterScale;
if ( wishspeed > pm->ps->speed * waterScale ) {
wishspeed = pm->ps->speed * waterScale;
}
}
// when a player gets hit, they temporarily lose
// full control, which allows them to be moved a bit
if ( ( pml.groundTrace.surfaceFlags & SURF_SLICK ) || pm->ps->pm_flags & PMF_TIME_KNOCKBACK ) {
accelerate = pm_airaccelerate;
} else {
accelerate = pm_accelerate;
}
PM_Accelerate (wishdir, wishspeed, accelerate);
//Com_Printf("velocity = %1.1f %1.1f %1.1f\n", pm->ps->velocity[0], pm->ps->velocity[1], pm->ps->velocity[2]);
//Com_Printf("velocity1 = %1.1f\n", VectorLength(pm->ps->velocity));
if ( ( pml.groundTrace.surfaceFlags & SURF_SLICK ) || pm->ps->pm_flags & PMF_TIME_KNOCKBACK ) {
pm->ps->velocity[2] -= pm->ps->gravity * pml.frametime;
} else {
// don't reset the z velocity for slopes
// pm->ps->velocity[2] = 0;
}
vel = VectorLength(pm->ps->velocity);
// slide along the ground plane
PM_ClipVelocity (pm->ps->velocity, pml.groundTrace.plane.normal,
pm->ps->velocity, OVERCLIP );
// don't decrease velocity when going up or down a slope
VectorNormalize(pm->ps->velocity);
VectorScale(pm->ps->velocity, vel, pm->ps->velocity);
// don't do anything if standing still
if (!pm->ps->velocity[0] && !pm->ps->velocity[1]) {
return;
}
PM_StepSlideMove( qfalse );
//Com_Printf("velocity2 = %1.1f\n", VectorLength(pm->ps->velocity));
}
/*
==============
PM_DeadMove
==============
*/
static void PM_DeadMove( void ) {
float forward;
if ( !pml.walking ) {
return;
}
// extra friction
forward = VectorLength (pm->ps->velocity);
forward -= 20;
if ( forward <= 0 ) {
VectorClear (pm->ps->velocity);
} else {
VectorNormalize (pm->ps->velocity);
VectorScale (pm->ps->velocity, forward, pm->ps->velocity);
}
}
/*
===============
PM_NoclipMove
===============
*/
static void PM_NoclipMove( void ) {
float speed, drop, friction, control, newspeed;
int i;
vec3_t wishvel;
float fmove, smove;
vec3_t wishdir;
float wishspeed;
float scale;
pm->ps->viewheight = DEFAULT_VIEWHEIGHT;
// friction
speed = VectorLength (pm->ps->velocity);
if (speed < 1)
{
VectorCopy (vec3_origin, pm->ps->velocity);
}
else
{
drop = 0;
friction = pm_friction*1.5; // 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 (pm->ps->velocity, newspeed, pm->ps->velocity);
}
// accelerate
scale = PM_CmdScale( &pm->cmd );
fmove = pm->cmd.forwardmove;
smove = pm->cmd.rightmove;
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);
wishspeed *= scale;
PM_Accelerate( wishdir, wishspeed, pm_accelerate );
// move
VectorMA (pm->ps->origin, pml.frametime, pm->ps->velocity, pm->ps->origin);
}
//============================================================================
/*
================
PM_FootstepForSurface
Returns an event number appropriate for the groundsurface
================
*/
static int PM_FootstepForSurface( void ) {
if ( pml.groundTrace.surfaceFlags & SURF_NOSTEPS ) {
return 0;
}
if ( pml.groundTrace.surfaceFlags & SURF_METALSTEPS ) {
return EV_FOOTSTEP_METAL;
}
return EV_FOOTSTEP;
}
/*
=================
PM_CrashLand
Check for hard landings that generate sound events
=================
*/
static void PM_CrashLand( void ) {
float delta;
float dist;
float vel, acc;
float t;
float a, b, c, den;
// decide which landing animation to use
if ( pm->ps->pm_flags & PMF_BACKWARDS_JUMP ) {
PM_ForceLegsAnim( LEGS_LANDB );
} else {
PM_ForceLegsAnim( LEGS_LAND );
}
pm->ps->legsTimer = TIMER_LAND;
// calculate the exact velocity on landing
dist = pm->ps->origin[2] - pml.previous_origin[2];
vel = pml.previous_velocity[2];
acc = -pm->ps->gravity;
a = acc / 2;
b = vel;
c = -dist;
den = b * b - 4 * a * c;
if ( den < 0 ) {
return;
}
t = (-b - sqrt( den ) ) / ( 2 * a );
delta = vel + t * acc;
delta = delta*delta * 0.0001;
// ducking while falling doubles damage
if ( pm->ps->pm_flags & PMF_DUCKED ) {
delta *= 2;
}
// never take falling damage if completely underwater
if ( pm->waterlevel == 3 ) {
return;
}
// reduce falling damage if there is standing water
if ( pm->waterlevel == 2 ) {
delta *= 0.25;
}
if ( pm->waterlevel == 1 ) {
delta *= 0.5;
}
if ( delta < 1 ) {
return;
}
// create a local entity event to play the sound
// SURF_NODAMAGE is used for bounce pads where you don't ever
// want to take damage or play a crunch sound
if ( !(pml.groundTrace.surfaceFlags & SURF_NODAMAGE) ) {
if ( delta > 60 ) {
PM_AddEvent( EV_FALL_FAR );
} else if ( delta > 40 ) {
// this is a pain grunt, so don't play it if dead
if ( pm->ps->stats[STAT_HEALTH] > 0 ) {
PM_AddEvent( EV_FALL_MEDIUM );
}
} else if ( delta > 7 ) {
PM_AddEvent( EV_FALL_SHORT );
} else {
PM_AddEvent( PM_FootstepForSurface() );
}
}
// start footstep cycle over
pm->ps->bobCycle = 0;
}