From 9712ec712cc6a57d416ef2b1e86d15ef161016df Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Fri, 3 Mar 2023 11:18:16 +0000
Subject: implemented toroidal warping. set a default font.

---
 dat.h      |  1 +
 musw.c     |  3 ++-
 muswd.c    |  4 +++-
 todo       |  5 +++--
 universe.c | 33 +++++++++++++++++++++++++++++++++
 5 files changed, 42 insertions(+), 4 deletions(-)

diff --git a/dat.h b/dat.h
index 26755c5..9a27f17 100644
--- a/dat.h
+++ b/dat.h
@@ -141,6 +141,7 @@ struct Universe
 	double t, timeacc;
 
 	void (*step)(Universe*, double);
+	void (*collide)(Universe*);
 	void (*reset)(Universe*);
 };
 
diff --git a/musw.c b/musw.c
index b7ea5e9..32bf155 100644
--- a/musw.c
+++ b/musw.c
@@ -41,6 +41,7 @@ Image *skymap;
 Channel *ingress;
 Channel *egress;
 NetConn netconn;
+char deffont[] = "/lib/font/bit/pelm/unicode.9.font";
 char winspec[32];
 int doghosting;
 int debug;
@@ -583,7 +584,7 @@ threadmain(int argc, char *argv[])
 	snprint(winspec, sizeof winspec, "-dx %d -dy %d", SCRWB, SCRHB);
 	if(newwindow(winspec) < 0)
 		sysfatal("newwindow: %r");
-	if(initdraw(nil, nil, nil) < 0)
+	if(initdraw(nil, deffont, "musw") < 0)
 		sysfatal("initdraw: %r");
 	if((mc = initmouse(nil, screen)) == nil)
 		sysfatal("initmouse: %r");
diff --git a/muswd.c b/muswd.c
index 0813e48..fd4f183 100644
--- a/muswd.c
+++ b/muswd.c
@@ -352,8 +352,10 @@ partywalk:
 				player->oldkdown = player->kdown;
 			}
 
-			while(p->u->timeacc >= Δt)
+			while(p->u->timeacc >= Δt){
 				p->u->step(p->u, Δt);
+				p->u->collide(p->u);
+			}
 		}
 
 		broadcaststate();
diff --git a/todo b/todo
index 6ebcaa8..bfc0a3d 100644
--- a/todo
+++ b/todo
@@ -1,7 +1,7 @@
 [ ] collision detection
-[ ] toroidal warping
+[✓] toroidal warping
 [ ] respect bullets's ttl
-	[ ] communicate this event with the clients
+	[ ] communicate this event to the clients
 	[ ] explode when the time comes
 [ ] fuel consumption
 [ ] hyperjump
@@ -13,3 +13,4 @@
 	[ ] waiting for a player
 	[ ] main game
 [ ] reduce the amount of data sent on every NSsimstate packet
+[ ] the client must try to connect continously
diff --git a/universe.c b/universe.c
index cf310ef..0b3028f 100644
--- a/universe.c
+++ b/universe.c
@@ -70,6 +70,38 @@ universe_step(Universe *u, double Δt)
 	u->t += Δt;
 }
 
+static void
+warp(Particle *p)
+{
+	Rectangle r;
+
+	r = Rect(-SCRW/2, -SCRH/2, SCRW/2, SCRH/2);
+
+	if(p->p.x < r.min.x)
+		p->p.x = r.max.x;
+	if(p->p.y < r.min.y)
+		p->p.y = r.max.y;
+	if(p->p.x > r.max.x)
+		p->p.x = r.min.x;
+	if(p->p.y > r.max.y)
+		p->p.y = r.min.y;	
+}
+
+/* collision resolution */
+static void
+universe_collide(Universe *u)
+{
+	Ship *s;
+	Bullet *b;
+
+	for(s = u->ships; s < u->ships+nelem(u->ships); s++){
+		for(b = s->rounds; b < s->rounds+nelem(s->rounds); b++){
+			warp(b);
+		}
+		warp(s);
+	}
+}
+
 static void
 universe_reset(Universe *u)
 {
@@ -130,6 +162,7 @@ newuniverse(void)
 	u = emalloc(sizeof(Universe));
 	memset(u, 0, sizeof *u);
 	u->step = universe_step;
+	u->collide = universe_collide;
 	u->reset = universe_reset;
 	return u;
 }
-- 
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