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

@@ -664,6 +664,39 @@ Use_Plat(edict_t *ent, edict_t *other, 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 /* unsed */,
 		csurface_t *surf /* unused */)
@@ -687,7 +720,7 @@ Touch_Plat_Center(edict_t *ent, edict_t *other, cplane_t *plane /* unsed */,
 
 	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

@@ -23,6 +23,7 @@ edict_t *g_edicts;
 cvar_t *deathmatch;
 cvar_t *coop;
 cvar_t *coop_baseq2;	/* treat spawnflags according to baseq2 rules */
+cvar_t *coop_elevator_delay;
 cvar_t *coop_pickup_weapons;
 cvar_t *dmflags;
 cvar_t *skill;

src/header/local.h

@@ -585,6 +585,7 @@ extern cvar_t *maxentities;
 extern cvar_t *deathmatch;
 extern cvar_t *coop;
 extern cvar_t *coop_baseq2;	/* treat spawnflags according to baseq2 rules */
+extern cvar_t *coop_elevator_delay;
 extern cvar_t *coop_pickup_weapons;
 extern cvar_t *dmflags;
 extern cvar_t *skill;

src/savegame/savegame.c

@@ -214,7 +214,8 @@ InitGame(void)
 	deathmatch = gi.cvar ("deathmatch", "0", CVAR_LATCH);
 	coop = gi.cvar ("coop", "0", CVAR_LATCH);
 	coop_baseq2 = gi.cvar ("coop_baseq2", "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);
 	gamerules = gi.cvar ("gamerules", "0", CVAR_LATCH);			//PGM

src/savegame/tables/gamefunc_decs.h

@@ -1487,3 +1487,4 @@ extern void DBall_GameInit ( void ) ;
 extern void DBall_SelectSpawnPoint ( edict_t * ent , vec3_t origin , vec3_t angles ) ;
 extern void DBall_ClientBegin ( edict_t * ent ) ;
 extern int DBall_CheckDMRules ( void ) ;
+extern void wait_and_change_think(edict_t* ent);

src/savegame/tables/gamefunc_list.h

@@ -1488,4 +1488,5 @@
 {"DBall_SelectSpawnPoint", (byte *)DBall_SelectSpawnPoint},
 {"DBall_ClientBegin", (byte *)DBall_ClientBegin},
 {"DBall_CheckDMRules", (byte *)DBall_CheckDMRules},
+{"wait_and_change_think", (byte *)wait_and_change_think},
 {0, 0}