From 565d8ad7e7a29a670764e9a181c04773ea7d428e Mon Sep 17 00:00:00 2001
From: Marco Hladik <marco@icculus.org>
Date: Thu, 23 Sep 2021 01:01:59 +0200
Subject: [PATCH] PMove: Add flag FL_ONUSABLE, which will tell us if we're
 looking/hovering over something that we can +use on.

---
 src/shared/flags.h         |  2 +-
 src/shared/player_pmove.qc | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/shared/flags.h b/src/shared/flags.h
index 663ea5bb..af143b41 100644
--- a/src/shared/flags.h
+++ b/src/shared/flags.h
@@ -38,6 +38,6 @@
 #define FL_FROZEN		(1<<19)
 #define FL_USE_RELEASED		(1<<20)
 #define FL_NOATTACK		(1<<21)
-#define FL_RESERVED1		(1<<22)
+#define FL_ONUSABLE		(1<<22)
 #define FL_RESERVED2		(1<<23)
 #define FL_RESERVED3		(1<<15)
diff --git a/src/shared/player_pmove.qc b/src/shared/player_pmove.qc
index 66497d7f..71d34f20 100644
--- a/src/shared/player_pmove.qc
+++ b/src/shared/player_pmove.qc
@@ -323,6 +323,23 @@ base_player::Physics_Run(void)
 	input_buttons = saved_input_buttons;
 	Physics_InputPostMove();
 
+#ifdef SERVER
+	/* Use Flagger */
+	vector src, dest;
+	makevectors(input_angles);
+	src = origin + view_ofs;
+	dest = src + v_forward * 64;
+	traceline(src, dest, MOVE_NORMAL, this);
+
+	flags &= ~FL_ONUSABLE;
+	if (trace_ent.identity == 1) {
+		CBaseEntity foo = (CBaseEntity)trace_ent;
+		if (foo.PlayerUse) {
+			flags |= FL_ONUSABLE;
+		}
+	}
+#endif
+
 	angles[0] = Math_FixDelta(angles[0]);
 	angles[1] = Math_FixDelta(angles[1]);
 	angles[2] = Math_FixDelta(angles[2]);