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landscape.h
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1 /* $Id: landscape.h 23735 2012-01-03 20:26:05Z rubidium $ */
2
3 /*
4 * This file is part of OpenTTD.
5 * 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.
6 * 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.
7 * 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/>.
8 */
9
12 #ifndef LANDSCAPE_H
13 #define LANDSCAPE_H
14
15 #include "core/geometry_type.hpp"
16 #include "tile_cmd.h"
17
18 static const uint SNOW_LINE_MONTHS = 12;
19 static const uint SNOW_LINE_DAYS = 32;
20
25 struct SnowLine {
26 byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS];
27 byte highest_value;
28 byte lowest_value;
29 };
30
31 bool IsSnowLineSet();
32 void SetSnowLine(byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS]);
33 byte GetSnowLine();
34 byte HighestSnowLine();
35 byte LowestSnowLine();
36 void ClearSnowLine();
37
38 int GetSlopeZInCorner(Slope tileh, Corner corner);
39 Slope GetFoundationSlope(TileIndex tile, int *z = NULL);
40
41 uint GetPartialPixelZ(int x, int y, Slope corners);
42 int GetSlopePixelZ(int x, int y);
43 void GetSlopePixelZOnEdge(Slope tileh, DiagDirection edge, int *z1, int *z2);
44
54 static inline int GetSlopePixelZInCorner(Slope tileh, Corner corner)
55 {
56 return GetSlopeZInCorner(tileh, corner) * TILE_HEIGHT;
57 }
58
67 static inline Slope GetFoundationPixelSlope(TileIndex tile, int *z)
68 {
69 assert(z != NULL);
70 Slope s = GetFoundationSlope(tile, z);
71 *z *= TILE_HEIGHT;
72 return s;
73 }
74
83 static inline Point RemapCoords(int x, int y, int z)
84 {
85 Point pt;
86 pt.x = (y - x) * 2 * ZOOM_LVL_BASE;
87 pt.y = (y + x - z) * ZOOM_LVL_BASE;
88 return pt;
89 }
90
99 static inline Point RemapCoords2(int x, int y)
100 {
101 return RemapCoords(x, y, GetSlopePixelZ(x, y));
102 }
103
112 static inline Point InverseRemapCoords(int x, int y)
113 {
114 Point pt = {(y * 2 - x) >> (2 + ZOOM_LVL_SHIFT), (y * 2 + x) >> (2 + ZOOM_LVL_SHIFT)};
115 return pt;
116 }
117
118 uint ApplyFoundationToSlope(Foundation f, Slope *s);
127 static inline uint ApplyPixelFoundationToSlope(Foundation f, Slope *s)
128 {
129 return ApplyFoundationToSlope(f, s) * TILE_HEIGHT;
130 }
131
132 void DrawFoundation(TileInfo *ti, Foundation f);
133 bool HasFoundationNW(TileIndex tile, Slope slope_here, uint z_here);
134 bool HasFoundationNE(TileIndex tile, Slope slope_here, uint z_here);
135
136 void DoClearSquare(TileIndex tile);
137 void RunTileLoop();
138
139 void InitializeLandscape();
140 void GenerateLandscape(byte mode);
141
142 #endif /* LANDSCAPE_H */