Implemented `coop_elevator_delay` cvar (for func_plat)

In coop it's often hard to get on the same elevator together, because
they're immediately triggered once the first player steps on it.
This cvar sets a delay (1 second by default) for the elevator to wait
before moving, so other players have some time to get on it.
If you like elevators/platforms that suck, just set it to `0` :-P

Currently only used in func_plat, if it turns out that other entities
are used for automatically triggered platforms, we'll have to adapt
those as well (I guess wait_and_change() is generally useful for that).

We're not bumping the savegame version because they should only break in
an uncommon corner case: *Coop* savegames created with clients including
this change will not work on older clients - SP savegames are not
affected and old savegames on new clients also still work.

src/g_func.c

@@ -579,6 +579,39 @@ Use_Plat(edict_t *ent, edict_t *other /* unused */, edict_t *activator /* unused
 	plat_go_down(ent);
 }
 
+void
+wait_and_change_think(edict_t* ent)
+{
+	void (*afterwaitfunc)(edict_t *) = ent->moveinfo.endfunc;
+	ent->moveinfo.endfunc = NULL;
+	afterwaitfunc(ent);
+}
+
+/*
+ * In coop mode, this waits for coop_elevator_delay seconds
+ * before calling afterwaitfunc(ent); otherwise it just calls
+ * afterwaitfunc(ent);
+ */
+static void
+wait_and_change(edict_t* ent, void (*afterwaitfunc)(edict_t *))
+{
+	float waittime = coop_elevator_delay->value;
+	if (coop->value && waittime > 0.0f)
+	{
+		if(ent->nextthink == 0)
+		{
+			ent->moveinfo.endfunc = afterwaitfunc;
+			ent->think = wait_and_change_think;
+			ent->nextthink = level.time + waittime;
+		}
+	}
+	else
+	{
+		afterwaitfunc(ent);
+
+	}
+}
+
 void
 Touch_Plat_Center(edict_t *ent, edict_t *other, cplane_t *plane /* unused */,
 		csurface_t *surf /* unused */)
@@ -602,7 +635,7 @@ Touch_Plat_Center(edict_t *ent, edict_t *other, cplane_t *plane /* unused */,
 
 	if (ent->moveinfo.state == STATE_BOTTOM)
 	{
-		plat_go_up(ent);
+		wait_and_change(ent, plat_go_up);
 	}
 	else if (ent->moveinfo.state == STATE_TOP)
 	{

src/g_main.c

@@ -22,6 +22,7 @@ edict_t *g_edicts;
 
 cvar_t *deathmatch;
 cvar_t *coop;
+cvar_t *coop_elevator_delay;
 cvar_t *coop_pickup_weapons;
 cvar_t *dmflags;
 cvar_t *skill;

src/header/local.h

@@ -501,6 +501,7 @@ extern edict_t *g_edicts;
 extern cvar_t *maxentities;
 extern cvar_t *deathmatch;
 extern cvar_t *coop;
+extern cvar_t *coop_elevator_delay;
 extern cvar_t *coop_pickup_weapons;
 extern cvar_t *dmflags;
 extern cvar_t *skill;

src/savegame/savegame.c

@@ -209,7 +209,8 @@ InitGame(void)
 	maxspectators = gi.cvar ("maxspectators", "4", CVAR_SERVERINFO);
 	deathmatch = gi.cvar ("deathmatch", "0", CVAR_LATCH);
 	coop = gi.cvar ("coop", "0", CVAR_LATCH);
-	coop_pickup_weapons = gi.cvar("coop_pickup_weapons", "0", 0);
+	coop_elevator_delay = gi.cvar("coop_elevator_delay", "1.0", CVAR_ARCHIVE);
+	coop_pickup_weapons = gi.cvar("coop_pickup_weapons", "0", CVAR_ARCHIVE);
 	skill = gi.cvar ("skill", "1", CVAR_LATCH);
 	maxentities = gi.cvar ("maxentities", "1024", CVAR_LATCH);
 

src/savegame/tables/gamefunc_decs.h

@@ -1227,3 +1227,4 @@ extern void ai_walk ( edict_t * self , float dist ) ;
 extern void ai_stand ( edict_t * self , float dist ) ;
 extern void ai_move ( edict_t * self , float dist ) ;
 extern void AI_SetSightClient ( void ) ;
+extern void wait_and_change_think(edict_t* ent);

src/savegame/tables/gamefunc_list.h

@@ -1227,4 +1227,5 @@
 {"ai_stand", (byte *)ai_stand},
 {"ai_move", (byte *)ai_move},
 {"AI_SetSightClient", (byte *)AI_SetSightClient},
+{"wait_and_change_think", (byte *)wait_and_change_think},
 {0, 0}