Extend bridge signal simulation to support an unlimited no. of signals.

This is instead of the previous limit of 16, all stored in M2.

src/bridge_signal_map.h

@@ -0,0 +1,75 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file bridge_signal_map.h Map accessor functions for bridge signal simulation. */
+
+#ifndef BRIDGE_SIGNAL_MAP_H
+#define BRIDGE_SIGNAL_MAP_H
+
+#include "tile_type.h"
+#include "map_func.h"
+#include "signal_type.h"
+#include "core/bitmath_func.hpp"
+
+#include <vector>
+#include <unordered_map>
+
+struct LongBridgeSignalStorage {
+	std::vector<uint64> signal_red_bits;
+};
+
+extern std::unordered_map<TileIndex, LongBridgeSignalStorage> _long_bridge_signal_sim_map;
+
+SignalState GetBridgeEntranceSimulatedSignalStateExtended(TileIndex t, uint16 signal);
+
+static inline SignalState GetBridgeEntranceSimulatedSignalState(TileIndex t, uint16 signal)
+{
+	if (signal < 15) {
+		return GB(_m[t].m2, signal, 1) ? SIGNAL_STATE_RED : SIGNAL_STATE_GREEN;
+	} else {
+		return GetBridgeEntranceSimulatedSignalStateExtended(t, signal);
+	}
+}
+
+void SetBridgeEntranceSimulatedSignalStateExtended(TileIndex t, uint16 signal, SignalState state);
+
+static inline void SetBridgeEntranceSimulatedSignalState(TileIndex t, uint16 signal, SignalState state)
+{
+	if (signal < 15) {
+		SB(_m[t].m2, signal, 1, (state == SIGNAL_STATE_RED) ? 1 : 0);
+	} else {
+		SetBridgeEntranceSimulatedSignalStateExtended(t, signal, state);
+	}
+}
+
+void SetAllBridgeEntranceSimulatedSignalsGreenExtended(TileIndex t);
+
+static inline void SetAllBridgeEntranceSimulatedSignalsGreen(TileIndex t)
+{
+	if (_m[t].m2 & 0x8000) {
+		SetAllBridgeEntranceSimulatedSignalsGreenExtended(t);
+	} else {
+		_m[t].m2 = 0;
+	}
+}
+
+void ClearBridgeEntranceSimulatedSignalsExtended(TileIndex t);
+
+static inline void ClearBridgeEntranceSimulatedSignals(TileIndex t)
+{
+	if (_m[t].m2 & 0x8000) {
+		ClearBridgeEntranceSimulatedSignalsExtended(t);
+	} else {
+		_m[t].m2 = 0;
+	}
+}
+
+void ClearBridgeSimulatedSignalMapping();
+
+#endif /* BRIDGE_SIGNAL_MAP_H */