ref: f91aca52e7e978613bdecf33a486efdb990c8520
dir: /sim.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include "dat.h"
#include "fns.h"
Team team[Nteam], *curteam;
int nteam;
int initres[Nresource], foodcap;
static Lobj vlist = {.lo = &vlist, .lp = &vlist };
/* FIXME: networking: recvbuf and sendbuf for accumulating messages to flush
* to all clients */
/* FIXME: acceleration, deceleration, turning speed (360°) */
/* FIXME: minerals: 4 spaces in every direction forbidding cc placement */
/* FIXME: resource tiles: take 2x1 tiles, drawn on top of rest
* -> actual (immutable) object, not terrain (remove resource= from
* terrain shit, move to objects)
* -> minerals: min0?.grp, three types depending on abundance, with
* several variants each
* -> Geyser.grp (terrain pal?) */
/* FIXME: rip mineral sprites and implement terrain objects layer */
/* FIXME: buildings are aligned to map grid, while units are aligned to
* path grid -> building placement uses Map, not Path */
/* FIXME: verify that path node centering does in fact work correctly, esp
* viz blockmap and .subp; if it does, do centering at spawn */
/* FIXME: fix land spawning to always work if adjacent space can be found */
/* FIXME: once spawning is fixed, remove race-specific mentions and units from
* map spec, having only starts instead, resolving to a race's cc and spawning
* 4 workers by default (marked in db) */
/* FIXME:
- networking
. server: spawn server + local client (by default)
. client: connect to server
. both initialize a simulation, but only the server modifies state
- command line: choose whether or not to spawn a server and/or a client
(default: both)
- always spawn a server, always initialize loopback channel to it; client
should do the same amount of work but the server always has the last word
. don't systematically announce a port
- client: join observers on connect
- program a lobby for both client and server
. server: kick/ban ip's, rate limit, set teams and rules
. master client -> server priviledges
. master client == local client
. if spawning a server only, local client just implements the lobby
and a console interface, same as lobby, for controlling the server
. client: choose slot
*/
/* FIXME: db: build tree specification */
static Lobj *
lalloc(Mobj *mo, ulong sz)
{
Lobj *lo, *l;
lo = emalloc(sz * sizeof *lo);
for(l=lo; sz>0; sz--, l++)
l->mo = mo;
return lo;
}
void
llink(Lobj *lo, Lobj *lp)
{
lo->lo = lp->lo;
lo->lp = lp;
lp->lo->lp = lo;
lp->lo = lo;
}
void
lunlink(Lobj *lo)
{
lo->lp->lo = lo->lo;
lo->lo->lp = lo->lp;
}
static void
lfree(Lobj *lo)
{
lunlink(lo);
free(lo);
}
static void
freepath(Mobj *mo)
{
if(mo->path == nil)
return;
free(mo->path);
mo->path = mo->pathp = mo->pathe = nil;
lunlink(mo->vl);
}
static void
nextpath(Mobj *mo)
{
int Δθ, vx, vy;
double θ, l;
Point p;
p = *mo->pathp++;
vx = p.x - mo->p.x;
vy = p.y - mo->p.y;
l = sqrt(vx * vx + vy * vy);
mo->vx = vx / l;
mo->vy = vy / l;
mo->vv = mo->o->speed;
θ = atan2(mo->vy, mo->vx) + PI / 2;
if(θ < 0)
θ += 2 * PI;
else if(θ >= 2 * PI)
θ -= 2 * PI;
Δθ = (θ / (2*PI) * 360) / (90. / (Nrot/4)) - mo->θ;
if(Δθ <= -Nrot / 2)
Δθ += Nrot;
else if(Δθ >= Nrot / 2)
Δθ -= Nrot;
mo->Δθ = Δθ;
}
static int
repath(Mobj *mo, Point *p)
{
freepath(mo);
if(findpath(mo, p) < 0){
fprint(2, "repath: move to %d,%d: %r\n", p->x, p->y);
return -1;
}
if(mo->vl == nil)
mo->vl = lalloc(mo, 1);
llink(mo->vl, vlist.lp);
mo->pics = mo->o->pmove.p != nil ? &mo->o->pmove : &mo->o->pidle;
nextpath(mo);
return 0;
}
static int
canmove(int x, int y, Mobj **op)
{
/* FIXME: attempt to move in the given direction even if impassible */
USED(x, y, op);
return 1;
}
int
move(int x, int y, Mobj **op)
{
Mobj *mo, **mp;
Point p;
if(!canmove(x, y, op))
return -1;
for(mp=op; (mo=*mp)!=nil; mp++){
/* FIXME: offset sprite size */
p = (Point){x & ~Tlsubmask, y & ~Tlsubmask};
if(mo->o->speed != 0 && repath(mo, &p) < 0)
continue;
}
return 0;
}
/* FIXME: we're not actually spawning a unit at a location, are we? it's a
* unit or structure that spawns a unit, the placement is determined based on
* available space -> the spawning mechanism works the same; initial units are
* always the same and are spawned in the same manner */
static int
canspawn(Map *m, Mobj *mo)
{
Point p;
/* FIXME: find space, unless not a unit */
p.x = m->tx * (Tlwidth / Tlsubwidth);
p.y = m->ty * (Tlheight / Tlsubheight);
if(isblocked(&p, mo)){
werrstr("no available space");
return 0;
}
return 1;
}
int
spawn(Map *m, Obj *o, int n)
{
Mobj *mo;
mo = emalloc(sizeof *mo);
mo->o = o;
mo->p.x = m->x;
mo->p.y = m->y;
if(!canspawn(m, mo)){
free(mo);
return -1;
}
mo->x = m->x / Tlsubwidth;
mo->y = m->y / Tlsubheight;
mo->team = n;
mo->f = o->f;
mo->hp = o->hp;
mo->zl = lalloc(mo, 1);
llink(mo->zl, &m->lo);
mo->blk = lalloc(mo, mo->o->w * (Tlwidth / Tlsubwidth) * mo->o->h * (Tlheight / Tlsubheight));
setblk(mo, 0);
mo->pics = &mo->o->pidle;
if(mo->f & Fbuild)
team[n].nbuild++;
else
team[n].nunit++;
return 0;
}
static void
tryturn(Mobj *mo)
{
int Δθ;
Δθ = mo->Δθ < 0 ? -1 : 1;
mo->θ = mo->θ + Δθ & Nrot - 1;
mo->Δθ -= Δθ;
}
static int
trymove(Mobj *mo)
{
int Δr, sx, sy;
Point subΔr, subp, p, pp;
subΔr.x = mo->vx * mo->vv * (1 << Tlshift);
subΔr.y = mo->vy * mo->vv * (1 << Tlshift);
sx = subΔr.x < 0 ? -1 : 1;
sy = subΔr.y < 0 ? -1 : 1;
subΔr.x *= sx;
subΔr.y *= sy;
Δr = sx * (mo->pathp[-1].x - mo->p.x << Tlshift) - mo->subp.x;
if(subΔr.x > Δr)
subΔr.x = Δr;
Δr = sy * (mo->pathp[-1].y - mo->p.y << Tlshift) - mo->subp.y;
if(subΔr.y > Δr)
subΔr.y = Δr;
while(subΔr.x > 0 || subΔr.y > 0){
p = mo->p;
subp = mo->subp;
if(subΔr.x > 0){
Δr = (Tlsubwidth << Tlshift) - subp.x;
if(Δr <= subΔr.x){
p.x += sx * Tlsubwidth;
subp.x = 0;
}else{
subp.x += subΔr.x;
p.x += sx * (subp.x >> Tlshift);
subp.x &= (1 << Tlshift) - 1;
}
subΔr.x -= Δr;
}
if(subΔr.y > 0){
Δr = (Tlsubheight << Tlshift) - subp.y;
if(Δr <= subΔr.y){
p.y += sy * Tlsubheight;
subp.y = 0;
}else{
subp.y += subΔr.y;
p.y += sy * (subp.y >> Tlshift);
subp.y &= (1 << Tlshift) - 1;
}
subΔr.y -= Δr;
}
pp.x = p.x / Tlsubwidth;
pp.y = p.y / Tlsubheight;
if(mo->x != pp.x || mo->y != pp.y){
if(isblocked(&pp, mo))
return -1;
setblk(mo, 1);
mo->x = pp.x;
mo->y = pp.y;
setblk(mo, 0);
}
mo->subp = subp;
mo->p = p;
}
return 0;
}
static void
stepmove(Mobj *mo)
{
Point pp;
Map *m, *m´;
/* FIXME: constant turn speed for now, but is it always so? */
/* FIXME: too slow */
if(mo->Δθ != 0){
tryturn(mo);
return;
}
m = map + mo->y / (Tlheight / Tlsubheight) * mapwidth
+ mo->x / (Tlwidth / Tlsubwidth);
/* FIXME: update speed (based on range from src and to target?) */
/* FIXME: update speed: accel, decel, turning speed */
if(trymove(mo) < 0){
mo->vv = 0.0;
pp = mo->pathe[-1];
fprint(2, "mo %#p blocked at %d,%d goal %d,%d\n", mo, mo->x * Tlsubwidth, mo->y * Tlsubheight, mo->pathp[-1].x, mo->pathp[-1].y);
/* FIXME: if path now blocked, move towards target anyway */
repath(mo, &pp);
return;
}
if(mo->p.x == mo->pathp[-1].x && mo->p.y == mo->pathp[-1].y){
if(mo->pathp < mo->pathe)
nextpath(mo);
else{
freepath(mo);
mo->pics = &mo->o->pidle;
}
}
m´ = map + mo->y / (Tlheight / Tlsubheight) * mapwidth
+ mo->x / (Tlwidth / Tlsubwidth);
if(m != m´){
lunlink(mo->zl);
llink(mo->zl, &m´->lo);
}
}
void
stepsim(void)
{
Lobj *lo;
for(lo=vlist.lo; lo!=&vlist; lo=lo->lo)
stepmove(lo->mo);
}
static void
initsim(void)
{
Team *t;
if(nteam < 2)
sysfatal("initgame: the only winning move is not to play");
for(t=team; t<=team+nteam; t++)
memcpy(t->r, initres, sizeof initres);
}
void
initsv(void)
{
initsim();
listennet();
}