smatz@8587: /* $Id$ */
smatz@8587: 
rubidium@8137: #include "stdafx.h"
rubidium@8137: #include "openttd.h"
rubidium@8137: #include "functions.h"
rubidium@8137: #include "rail_map.h"
rubidium@8137: #include "road.h"
rubidium@8137: #include "road_map.h"
rubidium@8137: #include "water_map.h"
rubidium@8137: #include "macros.h"
rubidium@8137: 
rubidium@8137: bool IsPossibleCrossing(const TileIndex tile, Axis ax)
rubidium@8137: {
rubidium@8137: 	return (IsTileType(tile, MP_RAILWAY) &&
rubidium@8137: 		!HasSignals(tile) &&
rubidium@8137: 		GetTrackBits(tile) == (ax == AXIS_X ?  TRACK_BIT_Y : TRACK_BIT_X) &&
rubidium@8137: 		GetTileSlope(tile, NULL) == SLOPE_FLAT);
rubidium@8137: }
rubidium@8137: 
rubidium@8137: RoadBits CleanUpRoadBits(const TileIndex tile, RoadBits org_rb)
rubidium@8137: {
rubidium@8137: 	for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
rubidium@8137: 		const TileIndex neighbor_tile = TileAddByDiagDir(tile, dir);
rubidium@8137: 
rubidium@8137: 		/* Get the Roadbit pointing to the neighbor_tile */
rubidium@8137: 		const RoadBits target_rb = DiagDirToRoadBits(dir);
rubidium@8137: 
rubidium@8137: 		/* If the roadbit is in the current plan */
rubidium@8137: 		if (org_rb & target_rb) {
rubidium@8137: 			bool connective = false;
rubidium@8137: 			const RoadBits mirrored_rb = MirrorRoadBits(target_rb);
rubidium@8137: 
rubidium@8137: 			switch (GetTileType(neighbor_tile)) {
rubidium@8137: 				/* Allways connective ones */
rubidium@8137: 				case MP_CLEAR: case MP_TREES:
rubidium@8137: 					connective = true;
rubidium@8137: 					break;
rubidium@8137: 
rubidium@8137: 				/* The conditionaly connective ones */
rubidium@8137: 				case MP_TUNNELBRIDGE:
rubidium@8137: 				case MP_STATION:
rubidium@8137: 				case MP_ROAD: {
rubidium@8137: 					const RoadBits neighbor_rb = GetAnyRoadBits(neighbor_tile, ROADTYPE_ROAD) | GetAnyRoadBits(neighbor_tile, ROADTYPE_TRAM);
rubidium@8137: 
rubidium@8137: 					/* Accept only connective tiles */
rubidium@8137: 					connective = (neighbor_rb & mirrored_rb) || // Neighbor has got the fitting RoadBit
truelight@8328: 							CountBits(neighbor_rb) == 1; // Neighbor has got only one Roadbit
rubidium@8137: 
rubidium@8137: 				} break;
rubidium@8137: 
rubidium@8137: 				case MP_RAILWAY:
rubidium@8137: 					connective = IsPossibleCrossing(neighbor_tile, DiagDirToAxis(dir));
rubidium@8137: 					break;
rubidium@8137: 
rubidium@8137: 				case MP_WATER:
rubidium@8137: 					/* Check for real water tile */
rubidium@8137: 					connective = !IsWater(neighbor_tile);
rubidium@8137: 					break;
rubidium@8137: 
rubidium@8137: 				/* The defentetly not connective ones */
rubidium@8137: 				default: break;
rubidium@8137: 			}
rubidium@8137: 
rubidium@8137: 			/* If the neighbor tile is inconnective remove the planed road connection to it */
rubidium@8137: 			if (!connective) org_rb ^= target_rb;
rubidium@8137: 
rubidium@8137: 		}
rubidium@8137: 	}
rubidium@8137: 
rubidium@8137: 	return org_rb;
rubidium@8137: }