Feature: Add NotRoadTypes (NRT)

src/newgrf.h

@@ -14,6 +14,7 @@
 
 #include "cargotype.h"
 #include "rail_type.h"
+#include "road_type.h"
 #include "fileio_type.h"
 #include "core/bitmath_func.hpp"
 #include "core/alloc_type.hpp"
@@ -83,6 +84,8 @@ enum GrfSpecFeature {
 	GSF_OBJECTS,
 	GSF_RAILTYPES,
 	GSF_AIRPORTTILES,
+	GSF_ROADTYPES,
+	GSF_TRAMTYPES,
 	GSF_END,
 
 	GSF_FAKE_TOWNS = GSF_END, ///< Fake town GrfSpecFeature for NewGRF debugging (parent scope)
@@ -128,6 +131,12 @@ struct GRFFile : ZeroedMemoryAllocator {
 	std::vector<RailTypeLabel> railtype_list;       ///< Railtype translation table
 	RailType railtype_map[RAILTYPE_END];
 
+	std::vector<RoadTypeLabel> roadtype_list;       ///< Roadtype translation table (road)
+	RoadType roadtype_map[ROADTYPE_END];
+
+	std::vector<RoadTypeLabel> tramtype_list;       ///, Roadtype translation table (tram)
+	RoadType tramtype_map[ROADTYPE_END];
+
 	CanalProperties canal_local_properties[CF_END]; ///< Canal properties as set by this NewGRF
 
 	struct LanguageMap *language_map; ///< Mappings related to the languages.
@@ -158,12 +167,19 @@ enum ShoreReplacement {
 	SHORE_REPLACE_ONLY_NEW,   ///< Only corner-shores were loaded by Action5 (openttd(w/d).grf only).
 };
 
+enum TramReplacement {
+	TRAMWAY_REPLACE_DEPOT_NONE,       ///< No tram depot graphics were loaded.
+	TRAMWAY_REPLACE_DEPOT_WITH_TRACK, ///< Electrified depot graphics with tram track were loaded.
+	TRAMWAY_REPLACE_DEPOT_NO_TRACK,   ///< Electrified depot graphics without tram track were loaded.
+};
+
 struct GRFLoadedFeatures {
 	bool has_2CC;             ///< Set if any vehicle is loaded which uses 2cc (two company colours).
 	uint64 used_liveries;     ///< Bitmask of #LiveryScheme used by the defined engines.
 	bool has_newhouses;       ///< Set if there are any newhouses loaded.
 	bool has_newindustries;   ///< Set if there are any newindustries loaded.
 	ShoreReplacement shore;   ///< In which way shore sprites were replaced.
+	TramReplacement tram;     ///< In which way tram depots were replaced.
 };
 
 /**