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// physics.cpp: no physics books were hurt nor consulted in the construction of
// this code. All physics computations and constants were invented on the fly
// and simply tweaked until they "felt right", and have no basis in reality.
// Collision detection is simplistic but very robust (uses discrete steps at
// fixed fps).
#include "cube.h"
#import "DynamicEntity.h"
#import "Entity.h"
#import "MapModelInfo.h"
// collide with player or monster
bool
static bool
plcollide(
DynamicEntity *d, DynamicEntity *o, float &headspace, float &hi, float &lo)
DynamicEntity *d, DynamicEntity *o, float *headspace, float *hi, float *lo)
{
if (o.state != CS_ALIVE)
return true;
const float r = o.radius + d.radius;
if (fabs(o.o.x - d.o.x) < r && fabs(o.o.y - d.o.y) < r) {
if (d.o.z - d.eyeheight < o.o.z - o.eyeheight) {
if (o.o.z - o.eyeheight < hi)
hi = o.o.z - o.eyeheight - 1;
} else if (o.o.z + o.aboveeye > lo)
lo = o.o.z + o.aboveeye + 1;
if (o.o.z - o.eyeheight < *hi)
*hi = o.o.z - o.eyeheight - 1;
} else if (o.o.z + o.aboveeye > *lo)
*lo = o.o.z + o.aboveeye + 1;
if (fabs(o.o.z - d.o.z) < o.aboveeye + d.eyeheight)
return false;
if (d.monsterstate)
return false; // hack
headspace = d.o.z - o.o.z - o.aboveeye - d.eyeheight;
if (headspace < 0)
headspace = 10;
*headspace = d.o.z - o.o.z - o.aboveeye - d.eyeheight;
if (*headspace < 0)
*headspace = 10;
}
return true;
}
// recursively collide with a mipmapped corner cube
bool
cornertest(int mip, int x, int y, int dx, int dy, int &bx, int &by,
static bool
cornertest(int mip, int x, int y, int dx, int dy, int *bx, int *by, int *bs)
int &bs) // recursively collide with a mipmapped corner cube
sqr *w = wmip[mip];
struct sqr *w = wmip[mip];
int sz = ssize >> mip;
bool stest =
SOLID(SWS(w, x + dx, y, sz)) && SOLID(SWS(w, x, y + dy, sz));
mip++;
x /= 2;
y /= 2;
if (SWS(wmip[mip], x, y, ssize >> mip)->type == CORNER) {
bx = x << mip;
by = y << mip;
bs = 1 << mip;
*bx = x << mip;
*by = y << mip;
*bs = 1 << mip;
return cornertest(mip, x, y, dx, dy, bx, by, bs);
}
return stest;
}
// collide with a mapmodel
void
mmcollide(DynamicEntity *d, float &hi, float &lo) // collide with a mapmodel
static void
mmcollide(DynamicEntity *d, float *hi, float *lo)
{
for (Entity *e in ents) {
if (e.type != MAPMODEL)
continue;
MapModelInfo *mmi = getmminfo(e.attr2);
if (mmi == nil || !mmi.h)
continue;
const float r = mmi.rad + d.radius;
if (fabs(e.x - d.o.x) < r && fabs(e.y - d.o.y) < r) {
float mmz =
(float)(S(e.x, e.y)->floor + mmi.zoff + e.attr3);
if (d.o.z - d.eyeheight < mmz) {
if (mmz < hi)
hi = mmz;
} else if (mmz + mmi.h > lo)
lo = mmz + mmi.h;
if (mmz < *hi)
*hi = mmz;
} else if (mmz + mmi.h > *lo)
*lo = mmz + mmi.h;
}
}
}
// all collision happens here
// spawn is a dirty side effect used in spawning
// drop & rise are supplied by the physics below to indicate gravity/push for
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: -1000.0f;
for (int x = x1; x <= x2; x++)
for (int y = y1; y <= y2; y++) {
// collide with map
if (OUTBORD(x, y))
return false;
sqr *s = S(x, y);
struct sqr *s = S(x, y);
float ceil = s->ceil;
float floor = s->floor;
switch (s->type) {
case SOLID:
return false;
case CORNER: {
int bx = x, by = y, bs = 1;
if (x == x1 && y == y1 &&
cornertest(
0, x, y, -1, -1, bx, by, bs) &&
0, x, y, -1, -1, &bx, &by, &bs) &&
fx1 - bx + fy1 - by <= bs ||
x == x2 && y == y1 &&
cornertest(
0, x, y, 1, -1, bx, by, bs) &&
0, x, y, 1, -1, &bx, &by, &bs) &&
fx2 - bx >= fy1 - by ||
x == x1 && y == y2 &&
cornertest(
0, x, y, -1, 1, bx, by, bs) &&
0, x, y, -1, 1, &bx, &by, &bs) &&
fx1 - bx <= fy2 - by ||
x == x2 && y == y2 &&
cornertest(0, x, y, 1, 1, bx, by, bs) &&
cornertest(
0, x, y, 1, 1, &bx, &by, &bs) &&
fx2 - bx + fy2 - by >= bs)
return false;
break;
}
case FHF: // FIXME: too simplistic collision with
// slopes, makes it feels like tiny stairs
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if (hi - lo < d.eyeheight + d.aboveeye)
return false;
float headspace = 10;
for (id player in players) {
if (player == [OFNull null] || player == d)
continue;
if (!plcollide(d, player, headspace, hi, lo))
if (!plcollide(d, player, &headspace, &hi, &lo))
return false;
}
if (d != player1)
if (!plcollide(d, player1, headspace, hi, lo))
if (!plcollide(d, player1, &headspace, &hi, &lo))
return false;
// this loop can be a performance bottleneck with many monster on a slow
// cpu, should replace with a blockmap but seems mostly fast enough
for (DynamicEntity *monster in getmonsters())
if (!vreject(d.o, monster.o, 7.0f) && d != monster &&
!plcollide(d, monster, headspace, hi, lo))
!plcollide(d, monster, &headspace, &hi, &lo))
return false;
headspace -= 0.01f;
mmcollide(d, hi, lo); // collide with map models
mmcollide(d, &hi, &lo); // collide with map models
if (spawn) {
// just drop to floor (sideeffect)
d.o = OFMakeVector3D(d.o.x, d.o.y, lo + d.eyeheight);
d.onfloor = true;
} else {
const float space = d.o.z - d.eyeheight - lo;
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}
}
// main physics routine, moves a player/monster for a curtime step
// moveres indicated the physics precision (which is lower for monsters and
// multiplayer prediction) local is false for multiplayer prediction
void
moveplayer(DynamicEntity *pl, int moveres, bool local, int curtime)
static void
moveplayer4(DynamicEntity *pl, int moveres, bool local, int curtime)
{
const bool water = hdr.waterlevel > pl.o.z - 0.5f;
const bool floating = (editmode && local) || pl.state == CS_EDITING;
OFVector3D d; // vector of direction we ideally want to move in
d.x = (float)(pl.move * cos(rad(pl.yaw - 90)));
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// detect wether player is outside map, used for skipping zbuffer clear
// mostly
if (pl.o.x < 0 || pl.o.x >= ssize || pl.o.y < 0 || pl.o.y > ssize)
pl.outsidemap = true;
else {
sqr *s = S((int)pl.o.x, (int)pl.o.y);
struct sqr *s = S((int)pl.o.x, (int)pl.o.y);
pl.outsidemap = SOLID(s) ||
pl.o.z < s->floor - (s->type == FHF ? s->vdelta / 4 : 0) ||
pl.o.z > s->ceil + (s->type == CHF ? s->vdelta / 4 : 0);
}
// automatically apply smooth roll when strafing
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}
pl.inwater = water;
}
void
moveplayer(DynamicEntity *pl, int moveres, bool local)
{
loopi(physicsrepeat) moveplayer(pl, moveres, local,
loopi(physicsrepeat) moveplayer4(pl, moveres, local,
i ? curtime / physicsrepeat
: curtime - curtime / physicsrepeat * (physicsrepeat - 1));
}
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