trigger_playerfreeze: Initial implementation. This entity is used in Opposing Force/Blue Shift to freeze players, like in the drill sergeant intro. Works fine in the maps that use it.

src/gs-entbase/server.src

@@ -68,6 +68,7 @@ server/trigger_multiple.cpp
 server/trigger_push.cpp
 server/trigger_teleport.cpp
 server/trigger_transition.cpp
+server/trigger_playerfreeze.cpp
 server/trigger_relay.cpp
 server/env_shooter.cpp
 server/gibshooter.cpp

src/gs-entbase/server/trigger_playerfreeze.cpp

@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2016-2020 Marco Hladik <marco@icculus.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*QUAKED trigger_playerfreeze (1 0 0) (-8 -8 -8) (8 8 8)
+"targetname"    Name
+"killtarget"    Target to kill when triggered.
+
+Trigger that freezes all clients, until it is triggered again.
+Freezing a player means they're unable to move, they can still look around.
+
+Ideas: Add ability to supress looking around, firing weapons, using items
+and so on.
+*/
+
+class trigger_playerfreeze:CBaseTrigger
+{
+	void(void) trigger_playerfreeze;
+
+	virtual void(void) customphysics;
+	virtual void(entity,int) Trigger;
+	virtual void(void) Respawn;
+};
+
+void
+trigger_playerfreeze::customphysics(void)
+{
+	if (m_iValue == 0)
+		return;
+
+	/* some games might unset this flag every single frame */
+	for (entity f = world; (f = find(f, ::classname, "player"));) {
+		f.flags |= FL_FROZEN;
+	}
+}
+
+void
+trigger_playerfreeze::Trigger(entity act, int state)
+{
+	if (GetMaster() == FALSE)
+		return;
+
+	m_iValue = 1 - m_iValue;
+
+	if (m_iValue == 0) {
+		dprint("^2trigger_playerfreeze::^3Trigger^7: " \
+		       "Unfreezing clients\n");
+
+		/* force unfreeze */
+		for (entity f = world; (f = find(f, ::classname, "player"));) {
+			f.flags &= ~FL_FROZEN;
+		}
+	} else {
+		dprint("^2trigger_playerfreeze::^3Trigger^7: " \
+		       "Freezing clients\n");
+	}
+}
+
+void
+trigger_playerfreeze::Respawn(void)
+{
+	m_iValue = 0;
+}
+
+void
+trigger_playerfreeze::trigger_playerfreeze(void)
+{
+	CBaseTrigger::CBaseTrigger();
+}