summaryrefslogtreecommitdiff
path: root/src/road_func.h
blob: 7303ebff30b35c85106e16467cf6e36b06ee2b4f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
/* $Id$ */

/*
 * 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 road_func.h Functions related to roads. */

#ifndef ROAD_FUNC_H
#define ROAD_FUNC_H

#include "core/bitmath_func.hpp"
#include "road_type.h"
#include "direction_type.h"
#include "company_type.h"
#include "tile_type.h"

/**
 * Whether the given roadtype is valid.
 * @param rt the roadtype to check for validness
 * @return true if and only if valid
 */
static inline bool IsValidRoadType(RoadType rt)
{
	return rt == ROADTYPE_ROAD || rt == ROADTYPE_TRAM;
}

/**
 * Maps a RoadType to the corresponding RoadTypes value
 *
 * @param rt the roadtype to get the roadtypes from
 * @return the roadtypes with the given roadtype
 */
static inline RoadTypes RoadTypeToRoadTypes(RoadType rt)
{
	return (RoadTypes)(1 << rt);
}

/**
 * Returns the RoadTypes which are not present in the given RoadTypes
 *
 * This function returns the complement of a given RoadTypes.
 *
 * @param r The given RoadTypes
 * @return The complement of the given RoadTypes
 * @note The unused value ROADTYPES_HWAY will be used, too.
 */
static inline RoadTypes ComplementRoadTypes(RoadTypes r)
{
	return (RoadTypes)(ROADTYPES_ALL ^ r);
}


/**
 * Calculate the complement of a RoadBits value
 *
 * Simply flips all bits in the RoadBits value to get the complement
 * of the RoadBits.
 *
 * @param r The given RoadBits value
 * @return the complement
 */
static inline RoadBits ComplementRoadBits(RoadBits r)
{
	return (RoadBits)(ROAD_ALL ^ r);
}

/**
 * Calculate the mirrored RoadBits
 *
 * Simply move the bits to their new position.
 *
 * @param r The given RoadBits value
 * @return the mirrored
 */
static inline RoadBits MirrorRoadBits(RoadBits r)
{
	return (RoadBits)(GB(r, 0, 2) << 2 | GB(r, 2, 2));
}

/**
 * Calculate rotated RoadBits
 *
 * Move the Roadbits clockwise til they are in their final position.
 *
 * @param r The given RoadBits value
 * @param rot The given Rotation angle
 * @return the rotated
 */
static inline RoadBits RotateRoadBits(RoadBits r, DiagDirDiff rot)
{
	for (; rot > (DiagDirDiff)0; rot--) {
		r = (RoadBits)(GB(r, 0, 1) << 3 | GB(r, 1, 3));
	}
	return r;
}

/**
 * Check if we've got a straight road
 *
 * @param r The given RoadBits
 * @return true if we've got a straight road
 */
static inline bool IsStraightRoad(RoadBits r)
{
	return (r == ROAD_X || r == ROAD_Y);
}

/**
 * Create the road-part which belongs to the given DiagDirection
 *
 * This function returns a RoadBits value which belongs to
 * the given DiagDirection.
 *
 * @param d The DiagDirection
 * @return The result RoadBits which the selected road-part set
 */
static inline RoadBits DiagDirToRoadBits(DiagDirection d)
{
	return (RoadBits)(ROAD_NW << (3 ^ d));
}

/**
 * Create the road-part which belongs to the given Axis
 *
 * This function returns a RoadBits value which belongs to
 * the given Axis.
 *
 * @param a The Axis
 * @return The result RoadBits which the selected road-part set
 */
static inline RoadBits AxisToRoadBits(Axis a)
{
	return a == AXIS_X ? ROAD_X : ROAD_Y;
}

/**
 * Finds out, whether given company has all given RoadTypes available
 * @param company ID of company
 * @param rts RoadTypes to test
 * @return true if company has all requested RoadTypes available
 */
bool HasRoadTypesAvail(const CompanyID company, const RoadTypes rts);

/**
 * Validate functions for rail building.
 * @param rt road type to check.
 * @return true if the current company may build the road.
 */
bool ValParamRoadType(const RoadType rt);

/**
 * Get the road types the given company can build.
 * @param company the company to get the roadtypes for.
 * @return the road types.
 */
RoadTypes GetCompanyRoadtypes(const CompanyID company);

void UpdateLevelCrossing(TileIndex tile, bool sound = true);

#endif /* ROAD_FUNC_H */