Add E1M2 practice mode

include/g_local.h

@@ -1271,3 +1271,5 @@ int SpawnShowStatus(void);
 int SpawnicideStatus(void);
 void SpawnicideEnable(void);
 void SpawnicideDisable(void);
+
+qbool IsE1M2Practice(void);

include/progs.h

@@ -786,6 +786,7 @@ typedef struct gedict_s
 	string_t netname;
 	string_t target;
 	string_t targetname;
+	string_t firsttarget;
 	string_t message;
 	string_t noise;
 	string_t noise1;

src/buttons.c

@@ -81,6 +81,13 @@ void button_fire(void)
 
 	self->state = STATE_UP;
 
+	// Allow the button in the mega room floor to be pressed multiple times
+	// on E1M2 during practice mode.
+	if (IsE1M2Practice() && streq(self->model, "*16"))
+	{
+		self->wait = 1;
+	}
+
 	SUB_CalcMove(self->pos2, self->speed, button_wait);
 }
 

src/maps.c

@@ -692,3 +692,8 @@ char* SelectMapInCycle(char *buf, int buf_size)
 
 	return buf;
 }
+
+qbool IsE1M2Practice(void)
+{
+	return k_practice && streq(mapname, "e1m2");
+}

src/plats.c

@@ -338,11 +338,50 @@ void train_blocked(void)
 	T_Damage(other, self, self, self->dmg);
 }
 
+void train_reset(void)
+{
+	gedict_t *firsttarget;
+	vec3_t tmpv;
+
+	if (!self->firsttarget)
+	{
+		G_bprint(2, "train_reset: no firsttarget stored\n");
+		return;
+	}
+
+	firsttarget = find(world, FOFS(targetname), self->firsttarget);
+	if (!firsttarget)
+	{
+		G_bprint(2, "train_reset: couldn't find first path_corner\n");
+		return;
+	}
+
+	VectorSubtract(firsttarget->s.v.origin, self->s.v.mins, tmpv);
+	setorigin(self, tmpv[0], tmpv[1], tmpv[2]);
+
+	self->target = self->firsttarget;
+	self->think = (func_t )funcref_train_find;
+}
+
 void train_use(void)
 {
+	qbool isE1M2Practice = IsE1M2Practice();
+
+	if (isE1M2Practice && !self->firsttarget)
+	{
+		self->firsttarget = self->target;
+	}
+
 	if (self->think != (func_t) funcref_train_find)
 	{
-		return;		// already activated
+		if (isE1M2Practice)
+		{
+			train_reset();
+		}
+		else
+		{
+			return;
+		}
 	}
 
 	train_next();