ref: a6e0affe834cf1fcbaad864506f2647566890fd2
dir: /qw/sv_phys.c/
#include "quakedef.h"
/*
pushmove objects do not obey gravity, and do not interact with each other or trigger fields, but block normal movement and push normal objects when they move.
onground is set for toss objects when they come to a complete rest. it is set for steping or walking objects
doors, plats, etc are SOLID_BSP, and MOVETYPE_PUSH
bonus items are SOLID_TRIGGER touch, and MOVETYPE_TOSS
corpses are SOLID_NOT and MOVETYPE_TOSS
crates are SOLID_BBOX and MOVETYPE_TOSS
walking monsters are SOLID_SLIDEBOX and MOVETYPE_STEP
flying/floating monsters are SOLID_SLIDEBOX and MOVETYPE_FLY
solid_edge items only clip against bsp models.
*/
cvar_t sv_maxvelocity = {"sv_maxvelocity","2000"};
cvar_t sv_gravity = { "sv_gravity", "800"};
cvar_t sv_stopspeed = { "sv_stopspeed", "100"};
cvar_t sv_maxspeed = { "sv_maxspeed", "320"};
cvar_t sv_spectatormaxspeed = { "sv_spectatormaxspeed", "500"};
cvar_t sv_accelerate = { "sv_accelerate", "10"};
cvar_t sv_airaccelerate = { "sv_airaccelerate", "0.7"};
cvar_t sv_wateraccelerate = { "sv_wateraccelerate", "10"};
cvar_t sv_friction = { "sv_friction", "4"};
cvar_t sv_waterfriction = { "sv_waterfriction", "4"};
#define MOVE_EPSILON 0.01
void SV_Physics_Toss (edict_t *ent);
/*
================
SV_CheckAllEnts
================
*/
void SV_CheckAllEnts (void)
{
int e;
edict_t *check;
// see if any solid entities are inside the final position
check = NEXT_EDICT(sv.edicts);
for (e=1 ; e<sv.num_edicts ; e++, check = NEXT_EDICT(check))
{
if (check->free)
continue;
if (check->v.movetype == MOVETYPE_PUSH
|| check->v.movetype == MOVETYPE_NONE
|| check->v.movetype == MOVETYPE_NOCLIP)
continue;
if (SV_TestEntityPosition (check))
Con_Printf ("entity in invalid position\n");
}
}
/*
================
SV_CheckVelocity
================
*/
void SV_CheckVelocity (edict_t *ent)
{
int i;
//
// bound velocity
//
for (i=0 ; i<3 ; i++)
{
if (isnanf(ent->v.velocity[i]))
{
Con_Printf ("Got a NaN velocity on %s\n", PR_GetString(ent->v.classname));
ent->v.velocity[i] = 0;
}
if (isnanf(ent->v.origin[i]))
{
Con_Printf ("Got a NaN origin on %s\n", PR_GetString(ent->v.classname));
ent->v.origin[i] = 0;
}
if (ent->v.velocity[i] > sv_maxvelocity.value)
ent->v.velocity[i] = sv_maxvelocity.value;
else if (ent->v.velocity[i] < -sv_maxvelocity.value)
ent->v.velocity[i] = -sv_maxvelocity.value;
}
}
/*
=============
SV_RunThink
Runs thinking code if time. There is some play in the exact time the think
function will be called, because it is called before any movement is done
in a frame. Not used for pushmove objects, because they must be exact.
Returns false if the entity removed itself.
=============
*/
bool SV_RunThink (edict_t *ent)
{
float thinktime;
do
{
thinktime = ent->v.nextthink;
if (thinktime <= 0)
return true;
if (thinktime > sv.time + host_frametime)
return true;
if (thinktime < sv.time)
thinktime = sv.time; // don't let things stay in the past.
// it is possible to start that way
// by a trigger with a local time.
ent->v.nextthink = 0;
pr_global_struct->time = thinktime;
pr_global_struct->self = EDICT_TO_PROG(ent);
pr_global_struct->other = EDICT_TO_PROG(sv.edicts);
PR_ExecuteProgram (ent->v.think);
if (ent->free)
return false;
} while (1);
}
/*
==================
SV_Impact
Two entities have touched, so run their touch functions
==================
*/
void SV_Impact (edict_t *e1, edict_t *e2)
{
int old_self, old_other;
old_self = pr_global_struct->self;
old_other = pr_global_struct->other;
pr_global_struct->time = sv.time;
if (e1->v.touch && e1->v.solid != SOLID_NOT)
{
pr_global_struct->self = EDICT_TO_PROG(e1);
pr_global_struct->other = EDICT_TO_PROG(e2);
PR_ExecuteProgram (e1->v.touch);
}
if (e2->v.touch && e2->v.solid != SOLID_NOT)
{
pr_global_struct->self = EDICT_TO_PROG(e2);
pr_global_struct->other = EDICT_TO_PROG(e1);
PR_ExecuteProgram (e2->v.touch);
}
pr_global_struct->self = old_self;
pr_global_struct->other = old_other;
}
/*
==================
ClipVelocity
Slide off of the impacting object
returns the blocked flags (1 = floor, 2 = step / wall)
==================
*/
#define STOP_EPSILON 0.1
int ClipVelocity (vec3_t in, vec3_t normal, vec3_t out, float overbounce)
{
float backoff;
float change;
int i, blocked;
blocked = 0;
if (normal[2] > 0)
blocked |= 1; // floor
if (!normal[2])
blocked |= 2; // step
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;
}
return blocked;
}
/*
============
SV_FlyMove
The basic solid body movement clip that slides along multiple planes
Returns the clipflags if the velocity was modified (hit something solid)
1 = floor
2 = wall / step
4 = dead stop
If steptrace is not NULL, the trace of any vertical wall hit will be stored
============
*/
#define MAX_CLIP_PLANES 5
int SV_FlyMove (edict_t *ent, float time, trace_t *steptrace)
{
int bumpcount, numbumps;
vec3_t dir;
float d;
int numplanes;
vec3_t planes[MAX_CLIP_PLANES];
vec3_t primal_velocity, original_velocity, new_velocity;
int i, j;
trace_t trace;
vec3_t end;
float time_left;
int blocked;
numbumps = 4;
blocked = 0;
VectorCopy (ent->v.velocity, original_velocity);
VectorCopy (ent->v.velocity, primal_velocity);
numplanes = 0;
time_left = time;
for (bumpcount=0 ; bumpcount<numbumps ; bumpcount++)
{
for (i=0 ; i<3 ; i++)
end[i] = ent->v.origin[i] + time_left * ent->v.velocity[i];
trace = SV_Move (ent->v.origin, ent->v.mins, ent->v.maxs, end, false, ent);
if (trace.allsolid)
{ // entity is trapped in another solid
VectorCopy (vec3_origin, ent->v.velocity);
return 3;
}
if (trace.fraction > 0)
{ // actually covered some distance
VectorCopy (trace.endpos, ent->v.origin);
VectorCopy (ent->v.velocity, original_velocity);
numplanes = 0;
}
if (trace.fraction == 1)
break; // moved the entire distance
if (!trace.ent)
SV_Error ("SV_FlyMove: !trace.ent");
if (trace.plane.normal[2] > 0.7)
{
blocked |= 1; // floor
if (trace.ent->v.solid == SOLID_BSP)
{
ent->v.flags = (int)ent->v.flags | FL_ONGROUND;
ent->v.groundentity = EDICT_TO_PROG(trace.ent);
}
}
if (!trace.plane.normal[2])
{
blocked |= 2; // step
if (steptrace)
*steptrace = trace; // save for player extrafriction
}
//
// run the impact function
//
SV_Impact (ent, trace.ent);
if (ent->free)
break; // removed by the impact function
time_left -= time_left * trace.fraction;
// cliped to another plane
if (numplanes >= MAX_CLIP_PLANES)
{ // this shouldn't really happen
VectorCopy (vec3_origin, ent->v.velocity);
return 3;
}
VectorCopy (trace.plane.normal, planes[numplanes]);
numplanes++;
//
// modify original_velocity so it parallels all of the clip planes
//
for (i=0 ; i<numplanes ; i++)
{
ClipVelocity (original_velocity, planes[i], new_velocity, 1);
for (j=0 ; j<numplanes ; j++)
if (j != i)
{
if (DotProduct (new_velocity, planes[j]) < 0)
break; // not ok
}
if (j == numplanes)
break;
}
if (i != numplanes)
{ // go along this plane
VectorCopy (new_velocity, ent->v.velocity);
}
else
{ // go along the crease
if (numplanes != 2)
{
// Con_Printf ("clip velocity, numplanes == %d\n",numplanes);
VectorCopy (vec3_origin, ent->v.velocity);
return 7;
}
CrossProduct (planes[0], planes[1], dir);
d = DotProduct (dir, ent->v.velocity);
VectorScale (dir, d, ent->v.velocity);
}
//
// if original velocity is against the original velocity, stop dead
// to avoid tiny occilations in sloping corners
//
if (DotProduct (ent->v.velocity, primal_velocity) <= 0)
{
VectorCopy (vec3_origin, ent->v.velocity);
return blocked;
}
}
return blocked;
}
/*
============
SV_AddGravity
============
*/
void SV_AddGravity (edict_t *ent, float scale)
{
ent->v.velocity[2] -= scale * movevars.gravity * host_frametime;
}
/*
===============================================================================
PUSHMOVE
===============================================================================
*/
/*
============
SV_PushEntity
Does not change the entities velocity at all
============
*/
trace_t SV_PushEntity (edict_t *ent, vec3_t push)
{
trace_t trace;
vec3_t end;
VectorAdd (ent->v.origin, push, end);
if (ent->v.movetype == MOVETYPE_FLYMISSILE)
trace = SV_Move (ent->v.origin, ent->v.mins, ent->v.maxs, end, MOVE_MISSILE, ent);
else if (ent->v.solid == SOLID_TRIGGER || ent->v.solid == SOLID_NOT)
// only clip against bmodels
trace = SV_Move (ent->v.origin, ent->v.mins, ent->v.maxs, end, MOVE_NOMONSTERS, ent);
else
trace = SV_Move (ent->v.origin, ent->v.mins, ent->v.maxs, end, MOVE_NORMAL, ent);
VectorCopy (trace.endpos, ent->v.origin);
SV_LinkEdict (ent, true);
if (trace.ent)
SV_Impact (ent, trace.ent);
return trace;
}
/*
============
SV_Push
============
*/
bool SV_Push (edict_t *pusher, vec3_t move)
{
int i, e;
edict_t *check, *block;
vec3_t mins, maxs;
vec3_t pushorig;
int num_moved;
edict_t *moved_edict[MAX_EDICTS];
vec3_t moved_from[MAX_EDICTS];
for (i=0 ; i<3 ; i++)
{
mins[i] = pusher->v.absmin[i] + move[i];
maxs[i] = pusher->v.absmax[i] + move[i];
}
VectorCopy (pusher->v.origin, pushorig);
// move the pusher to it's final position
VectorAdd (pusher->v.origin, move, pusher->v.origin);
SV_LinkEdict (pusher, false);
// see if any solid entities are inside the final position
num_moved = 0;
check = NEXT_EDICT(sv.edicts);
for (e=1 ; e<sv.num_edicts ; e++, check = NEXT_EDICT(check))
{
if (check->free)
continue;
if (check->v.movetype == MOVETYPE_PUSH
|| check->v.movetype == MOVETYPE_NONE
|| check->v.movetype == MOVETYPE_NOCLIP)
continue;
pusher->v.solid = SOLID_NOT;
block = SV_TestEntityPosition (check);
pusher->v.solid = SOLID_BSP;
if (block)
continue;
// if the entity is standing on the pusher, it will definately be moved
if ( ! ( ((int)check->v.flags & FL_ONGROUND)
&& PROG_TO_EDICT(check->v.groundentity) == pusher) )
{
if ( check->v.absmin[0] >= maxs[0]
|| check->v.absmin[1] >= maxs[1]
|| check->v.absmin[2] >= maxs[2]
|| check->v.absmax[0] <= mins[0]
|| check->v.absmax[1] <= mins[1]
|| check->v.absmax[2] <= mins[2] )
continue;
// see if the ent's bbox is inside the pusher's final position
if (!SV_TestEntityPosition (check))
continue;
}
VectorCopy (check->v.origin, moved_from[num_moved]);
moved_edict[num_moved] = check;
num_moved++;
// try moving the contacted entity
VectorAdd (check->v.origin, move, check->v.origin);
block = SV_TestEntityPosition (check);
if (!block)
{ // pushed ok
SV_LinkEdict (check, false);
continue;
}
// if it is ok to leave in the old position, do it
VectorSubtract (check->v.origin, move, check->v.origin);
block = SV_TestEntityPosition (check);
if (!block)
{
num_moved--;
continue;
}
// if it is still inside the pusher, block
if (check->v.mins[0] == check->v.maxs[0])
{
SV_LinkEdict (check, false);
continue;
}
if (check->v.solid == SOLID_NOT || check->v.solid == SOLID_TRIGGER)
{ // corpse
check->v.mins[0] = check->v.mins[1] = 0;
VectorCopy (check->v.mins, check->v.maxs);
SV_LinkEdict (check, false);
continue;
}
VectorCopy (pushorig, pusher->v.origin);
SV_LinkEdict (pusher, false);
// if the pusher has a "blocked" function, call it
// otherwise, just stay in place until the obstacle is gone
if (pusher->v.blocked)
{
pr_global_struct->self = EDICT_TO_PROG(pusher);
pr_global_struct->other = EDICT_TO_PROG(check);
PR_ExecuteProgram (pusher->v.blocked);
}
// move back any entities we already moved
for (i=0 ; i<num_moved ; i++)
{
VectorCopy (moved_from[i], moved_edict[i]->v.origin);
SV_LinkEdict (moved_edict[i], false);
}
return false;
}
return true;
}
/*
============
SV_PushMove
============
*/
void SV_PushMove (edict_t *pusher, float movetime)
{
int i;
vec3_t move;
if (!pusher->v.velocity[0] && !pusher->v.velocity[1] && !pusher->v.velocity[2])
{
pusher->v.ltime += movetime;
return;
}
for (i=0 ; i<3 ; i++)
move[i] = pusher->v.velocity[i] * movetime;
if (SV_Push (pusher, move))
pusher->v.ltime += movetime;
}
/*
================
SV_Physics_Pusher
================
*/
void SV_Physics_Pusher (edict_t *ent)
{
float thinktime;
float oldltime;
float movetime;
vec3_t oldorg, move;
float l;
oldltime = ent->v.ltime;
thinktime = ent->v.nextthink;
if (thinktime < ent->v.ltime + host_frametime)
{
movetime = thinktime - ent->v.ltime;
if (movetime < 0)
movetime = 0;
}
else
movetime = host_frametime;
if (movetime)
{
SV_PushMove (ent, movetime); // advances ent->v.ltime if not blocked
}
if (thinktime > oldltime && thinktime <= ent->v.ltime)
{
VectorCopy (ent->v.origin, oldorg);
ent->v.nextthink = 0;
pr_global_struct->time = sv.time;
pr_global_struct->self = EDICT_TO_PROG(ent);
pr_global_struct->other = EDICT_TO_PROG(sv.edicts);
PR_ExecuteProgram (ent->v.think);
if (ent->free)
return;
VectorSubtract (ent->v.origin, oldorg, move);
l = Length(move);
if (l > 1.0/64)
{
// Con_Printf ("**** snap: %f\n", Length (l));
VectorCopy (oldorg, ent->v.origin);
SV_Push (ent, move);
}
}
}
/*
=============
SV_Physics_None
Non moving objects can only think
=============
*/
void SV_Physics_None (edict_t *ent)
{
// regular thinking
SV_RunThink (ent);
}
/*
=============
SV_Physics_Noclip
A moving object that doesn't obey physics
=============
*/
void SV_Physics_Noclip (edict_t *ent)
{
// regular thinking
if (!SV_RunThink (ent))
return;
VectorMA (ent->v.angles, host_frametime, ent->v.avelocity, ent->v.angles);
VectorMA (ent->v.origin, host_frametime, ent->v.velocity, ent->v.origin);
SV_LinkEdict (ent, false);
}
/*
==============================================================================
TOSS / BOUNCE
==============================================================================
*/
/*
=============
SV_CheckWaterTransition
=============
*/
void SV_CheckWaterTransition (edict_t *ent)
{
int cont;
cont = SV_PointContents (ent->v.origin);
if (!ent->v.watertype)
{ // just spawned here
ent->v.watertype = cont;
ent->v.waterlevel = 1;
return;
}
if (cont <= CONTENTS_WATER)
{
if (ent->v.watertype == CONTENTS_EMPTY)
{ // just crossed into water
SV_StartSound (ent, 0, "misc/h2ohit1.wav", 255, 1);
}
ent->v.watertype = cont;
ent->v.waterlevel = 1;
}
else
{
if (ent->v.watertype != CONTENTS_EMPTY)
{ // just crossed into water
SV_StartSound (ent, 0, "misc/h2ohit1.wav", 255, 1);
}
ent->v.watertype = CONTENTS_EMPTY;
ent->v.waterlevel = cont;
}
}
/*
=============
SV_Physics_Toss
Toss, bounce, and fly movement. When onground, do nothing.
=============
*/
void SV_Physics_Toss (edict_t *ent)
{
trace_t trace;
vec3_t move;
float backoff;
// regular thinking
if (!SV_RunThink (ent))
return;
if (ent->v.velocity[2] > 0)
ent->v.flags = (int)ent->v.flags & ~FL_ONGROUND;
// if onground, return without moving
if ( ((int)ent->v.flags & FL_ONGROUND) )
return;
SV_CheckVelocity (ent);
// add gravity
if (ent->v.movetype != MOVETYPE_FLY
&& ent->v.movetype != MOVETYPE_FLYMISSILE)
SV_AddGravity (ent, 1.0);
// move angles
VectorMA (ent->v.angles, host_frametime, ent->v.avelocity, ent->v.angles);
// move origin
VectorScale (ent->v.velocity, host_frametime, move);
trace = SV_PushEntity (ent, move);
if (trace.fraction == 1)
return;
if (ent->free)
return;
if (ent->v.movetype == MOVETYPE_BOUNCE)
backoff = 1.5;
else
backoff = 1;
ClipVelocity (ent->v.velocity, trace.plane.normal, ent->v.velocity, backoff);
// stop if on ground
if (trace.plane.normal[2] > 0.7)
{
if (ent->v.velocity[2] < 60 || ent->v.movetype != MOVETYPE_BOUNCE )
{
ent->v.flags = (int)ent->v.flags | FL_ONGROUND;
ent->v.groundentity = EDICT_TO_PROG(trace.ent);
VectorCopy (vec3_origin, ent->v.velocity);
VectorCopy (vec3_origin, ent->v.avelocity);
}
}
// check for in water
SV_CheckWaterTransition (ent);
}
/*
===============================================================================
STEPPING MOVEMENT
===============================================================================
*/
/*
=============
SV_Physics_Step
Monsters freefall when they don't have a ground entity, otherwise
all movement is done with discrete steps.
This is also used for objects that have become still on the ground, but
will fall if the floor is pulled out from under them.
FIXME: is this true?
=============
*/
void SV_Physics_Step (edict_t *ent)
{
bool hitsound;
// frefall if not onground
if ( ! ((int)ent->v.flags & (FL_ONGROUND | FL_FLY | FL_SWIM) ) )
{
if (ent->v.velocity[2] < movevars.gravity*-0.1)
hitsound = true;
else
hitsound = false;
SV_AddGravity (ent, 1.0);
SV_CheckVelocity (ent);
SV_FlyMove (ent, host_frametime, NULL);
SV_LinkEdict (ent, true);
if ( (int)ent->v.flags & FL_ONGROUND ) // just hit ground
{
if (hitsound)
SV_StartSound (ent, 0, "demon/dland2.wav", 255, 1);
}
}
// regular thinking
SV_RunThink (ent);
SV_CheckWaterTransition (ent);
}
//============================================================================
void SV_ProgStartFrame (void)
{
// let the progs know that a new frame has started
pr_global_struct->self = EDICT_TO_PROG(sv.edicts);
pr_global_struct->other = EDICT_TO_PROG(sv.edicts);
pr_global_struct->time = sv.time;
PR_ExecuteProgram (pr_global_struct->StartFrame);
}
/*
================
SV_RunEntity
================
*/
void SV_RunEntity (edict_t *ent)
{
if (ent->v.lastruntime == (float)realtime)
return;
ent->v.lastruntime = (float)realtime;
switch ( (int)ent->v.movetype)
{
case MOVETYPE_PUSH:
SV_Physics_Pusher (ent);
break;
case MOVETYPE_NONE:
SV_Physics_None (ent);
break;
case MOVETYPE_NOCLIP:
SV_Physics_Noclip (ent);
break;
case MOVETYPE_STEP:
SV_Physics_Step (ent);
break;
case MOVETYPE_TOSS:
case MOVETYPE_BOUNCE:
case MOVETYPE_FLY:
case MOVETYPE_FLYMISSILE:
SV_Physics_Toss (ent);
break;
default:
SV_Error ("SV_Physics: bad movetype %d", (int)ent->v.movetype);
}
}
/*
================
SV_RunNewmis
================
*/
void SV_RunNewmis (void)
{
edict_t *ent;
if (!pr_global_struct->newmis)
return;
ent = PROG_TO_EDICT(pr_global_struct->newmis);
host_frametime = 0.05;
pr_global_struct->newmis = 0;
SV_RunEntity (ent);
}
/*
================
SV_Physics
================
*/
void SV_Physics (void)
{
int i;
edict_t *ent;
static double old_time;
// don't bother running a frame if sys_ticrate seconds haven't passed
host_frametime = realtime - old_time;
if (host_frametime < sv_mintic.value)
return;
if (host_frametime > sv_maxtic.value)
host_frametime = sv_maxtic.value;
old_time = realtime;
pr_global_struct->frametime = host_frametime;
SV_ProgStartFrame ();
//
// treat each object in turn
// even the world gets a chance to think
//
ent = sv.edicts;
for (i=0 ; i<sv.num_edicts ; i++, ent = NEXT_EDICT(ent))
{
if (ent->free)
continue;
if (pr_global_struct->force_retouch)
SV_LinkEdict (ent, true); // force retouch even for stationary
if (i > 0 && i <= MAX_CLIENTS)
continue; // clients are run directly from packets
SV_RunEntity (ent);
SV_RunNewmis ();
}
if (pr_global_struct->force_retouch)
pr_global_struct->force_retouch--;
}
void SV_SetMoveVars(void)
{
movevars.gravity = sv_gravity.value;
movevars.stopspeed = sv_stopspeed.value;
movevars.maxspeed = sv_maxspeed.value;
movevars.spectatormaxspeed = sv_spectatormaxspeed.value;
movevars.accelerate = sv_accelerate.value;
movevars.airaccelerate = sv_airaccelerate.value;
movevars.wateraccelerate = sv_wateraccelerate.value;
movevars.friction = sv_friction.value;
movevars.waterfriction = sv_waterfriction.value;
movevars.entgravity = 1.0;
}