Sneak: Improve and fix various things

Remove useless `got_teleported`.
Fix jitter when walking against the sneak limits.
Fix damage evading on sneak ladders.

doc/client_lua_api.md

@@ -810,8 +810,6 @@ Methods:
     * returns player HP
 * `get_name()`
     * returns player name
-* `got_teleported()`
-    * returns true if player was teleported
 * `is_attached()`
     * returns true if player is attached
 * `is_touching_ground()`

src/localplayer.cpp

@@ -35,7 +35,6 @@ LocalPlayer::LocalPlayer(Client *client, const char *name):
 	Player(name, client->idef()),
 	parent(0),
 	hp(PLAYER_MAX_HP),
-	got_teleported(false),
 	isAttached(false),
 	touching_ground(false),
 	in_liquid(false),
@@ -305,29 +304,43 @@ void LocalPlayer::move(f32 dtime, Environment *env, f32 pos_max_d,
 	if (control.sneak && m_sneak_node_exists &&
 			!(fly_allowed && g_settings->getBool("free_move")) &&
 			!in_liquid && !is_climbing &&
-			physics_override_sneak && !got_teleported) {
+			physics_override_sneak) {
-		v3f sn_f = intToFloat(m_sneak_node, BS);
+		const v3f sn_f = intToFloat(m_sneak_node, BS);
-		const v3f bmin = m_sneak_node_bb_top.MinEdge;
+		const v3f bmin = sn_f + m_sneak_node_bb_top.MinEdge;
-		const v3f bmax = m_sneak_node_bb_top.MaxEdge;
+		const v3f bmax = sn_f + m_sneak_node_bb_top.MaxEdge;
+		const v3f old_pos = position;
+		const v3f old_speed = m_speed;
 
 		position.X = rangelim(position.X,
-				sn_f.X+bmin.X - sneak_max.X, sn_f.X+bmax.X + sneak_max.X);
+				bmin.X - sneak_max.X, bmax.X + sneak_max.X);
 		position.Z = rangelim(position.Z,
-				sn_f.Z+bmin.Z - sneak_max.Z, sn_f.Z+bmax.Z + sneak_max.Z);
+				bmin.Z - sneak_max.Z, bmax.Z + sneak_max.Z);
+
+		if (position.X != old_pos.X)
+			m_speed.X = 0;
+		if (position.Z != old_pos.Z)
+			m_speed.Z = 0;
 
 		// Because we keep the player collision box on the node, limiting
 		// position.Y is not necessary but useful to prevent players from
 		// being inside a node if sneaking on e.g. the lower part of a stair
 		if (!m_sneak_ladder_detected) {
-			position.Y = MYMAX(position.Y, sn_f.Y+bmax.Y);
+			position.Y = MYMAX(position.Y, bmax.Y);
 		} else {
 			// legacy behaviour that sometimes causes some weird slow sinking
 			m_speed.Y = MYMAX(m_speed.Y, 0);
 		}
-	}
 
-	if (got_teleported)
+		if (collision_info != NULL &&
-		got_teleported = false;
+				m_speed.Y - old_speed.Y > BS) {
+			// Collide with sneak node, report fall damage
+			CollisionInfo sn_info;
+			sn_info.node_p = m_sneak_node;
+			sn_info.old_speed = old_speed;
+			sn_info.new_speed = m_speed;
+			collision_info->push_back(sn_info);
+		}
+	}
 
 	// TODO: this shouldn't be hardcoded but transmitted from server
 	float player_stepheight = touching_ground ? (BS*0.6) : (BS*0.2);
@@ -449,9 +462,11 @@ void LocalPlayer::move(f32 dtime, Environment *env, f32 pos_max_d,
 		m_ledge_detected = detectLedge(map, nodemgr, floatToInt(position, BS));
 
 	/*
-		Set new position
+		Set new position but keep sneak node set
 	*/
+	bool sneak_node_exists = m_sneak_node_exists;
 	setPosition(position);
+	m_sneak_node_exists = sneak_node_exists;
 
 	/*
 		Report collisions
@@ -917,7 +932,7 @@ void LocalPlayer::old_move(f32 dtime, Environment *env, f32 pos_max_d,
 	*/
 	if (control.sneak && m_sneak_node_exists &&
 			!(fly_allowed && g_settings->getBool("free_move")) && !in_liquid &&
-			physics_override_sneak && !got_teleported) {
+			physics_override_sneak) {
 		f32 maxd = 0.5 * BS + sneak_max;
 		v3f lwn_f = intToFloat(m_sneak_node, BS);
 		position.X = rangelim(position.X, lwn_f.X - maxd, lwn_f.X + maxd);
@@ -938,9 +953,6 @@ void LocalPlayer::old_move(f32 dtime, Environment *env, f32 pos_max_d,
 		}
 	}
 
-	if (got_teleported)
-		got_teleported = false;
-
 	// this shouldn't be hardcoded but transmitted from server
 	float player_stepheight = touching_ground ? (BS * 0.6) : (BS * 0.2);
 
@@ -1055,9 +1067,11 @@ void LocalPlayer::old_move(f32 dtime, Environment *env, f32 pos_max_d,
 	}
 
 	/*
-		Set new position
+		Set new position but keep sneak node set
 	*/
+	bool sneak_node_exists = m_sneak_node_exists;
 	setPosition(position);
+	m_sneak_node_exists = sneak_node_exists;
 
 	/*
 		Report collisions

src/localplayer.h

@@ -47,7 +47,6 @@ public:
 	ClientActiveObject *parent;
 
 	u16 hp;
-	bool got_teleported;
 	bool isAttached;
 	bool touching_ground;
 	// This oscillates so that the player jumps a bit above the surface
@@ -126,7 +125,11 @@ public:
 
 	f32 getPitch() const { return m_pitch; }
 
-	void setPosition(const v3f &position) { m_position = position; }
+	inline void setPosition(const v3f &position)
+	{
+		m_position = position;
+		m_sneak_node_exists = false;
+	}
 
 	v3f getPosition() const { return m_position; }
 	v3f getEyePosition() const { return m_position + getEyeOffset(); }

src/network/clientpackethandler.cpp

@@ -561,7 +561,6 @@ void Client::handleCommand_MovePlayer(NetworkPacket* pkt)
 
 	*pkt >> pos >> pitch >> yaw;
 
-	player->got_teleported = true;
 	player->setPosition(pos);
 
 	infostream << "Client got TOCLIENT_MOVE_PLAYER"

src/script/lua_api/l_localplayer.cpp

@@ -68,14 +68,6 @@ int LuaLocalPlayer::l_get_name(lua_State *L)
 	return 1;
 }
 
-int LuaLocalPlayer::l_is_teleported(lua_State *L)
-{
-	LocalPlayer *player = getobject(L, 1);
-
-	lua_pushboolean(L, player->got_teleported);
-	return 1;
-}
-
 int LuaLocalPlayer::l_is_attached(lua_State *L)
 {
 	LocalPlayer *player = getobject(L, 1);
@@ -386,7 +378,6 @@ const luaL_Reg LuaLocalPlayer::methods[] = {
 		luamethod(LuaLocalPlayer, get_velocity),
 		luamethod(LuaLocalPlayer, get_hp),
 		luamethod(LuaLocalPlayer, get_name),
-		luamethod(LuaLocalPlayer, is_teleported),
 		luamethod(LuaLocalPlayer, is_attached),
 		luamethod(LuaLocalPlayer, is_touching_ground),
 		luamethod(LuaLocalPlayer, is_in_liquid),

src/script/lua_api/l_localplayer.h

@@ -39,7 +39,6 @@ private:
 
 	static int l_get_name(lua_State *L);
 
-	static int l_is_teleported(lua_State *L);
 	static int l_is_attached(lua_State *L);
 	static int l_is_touching_ground(lua_State *L);
 	static int l_is_in_liquid(lua_State *L);