landscape.h

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00001 /* $Id: landscape.h 23735 2012-01-03 20:26:05Z rubidium $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * 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.
00006  * 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.
00007  * 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/>.
00008  */
00009 
00012 #ifndef LANDSCAPE_H
00013 #define LANDSCAPE_H
00014 
00015 #include "core/geometry_type.hpp"
00016 #include "tile_cmd.h"
00017 
00018 static const uint SNOW_LINE_MONTHS = 12; 
00019 static const uint SNOW_LINE_DAYS   = 32; 
00020 
00025 struct SnowLine {
00026   byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS]; 
00027   byte highest_value; 
00028   byte lowest_value;  
00029 };
00030 
00031 bool IsSnowLineSet();
00032 void SetSnowLine(byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS]);
00033 byte GetSnowLine();
00034 byte HighestSnowLine();
00035 byte LowestSnowLine();
00036 void ClearSnowLine();
00037 
00038 int GetSlopeZInCorner(Slope tileh, Corner corner);
00039 Slope GetFoundationSlope(TileIndex tile, int *z = NULL);
00040 
00041 uint GetPartialPixelZ(int x, int y, Slope corners);
00042 int GetSlopePixelZ(int x, int y);
00043 void GetSlopePixelZOnEdge(Slope tileh, DiagDirection edge, int *z1, int *z2);
00044 
00054 static inline int GetSlopePixelZInCorner(Slope tileh, Corner corner)
00055 {
00056   return GetSlopeZInCorner(tileh, corner) * TILE_HEIGHT;
00057 }
00058 
00067 static inline Slope GetFoundationPixelSlope(TileIndex tile, int *z)
00068 {
00069   assert(z != NULL);
00070   Slope s = GetFoundationSlope(tile, z);
00071   *z *= TILE_HEIGHT;
00072   return s;
00073 }
00074 
00083 static inline Point RemapCoords(int x, int y, int z)
00084 {
00085   Point pt;
00086   pt.x = (y - x) * 2 * ZOOM_LVL_BASE;
00087   pt.y = (y + x - z) * ZOOM_LVL_BASE;
00088   return pt;
00089 }
00090 
00099 static inline Point RemapCoords2(int x, int y)
00100 {
00101   return RemapCoords(x, y, GetSlopePixelZ(x, y));
00102 }
00103 
00112 static inline Point InverseRemapCoords(int x, int y)
00113 {
00114   Point pt = {(y * 2 - x) >> (2 + ZOOM_LVL_SHIFT), (y * 2 + x) >> (2 + ZOOM_LVL_SHIFT)};
00115   return pt;
00116 }
00117 
00118 uint ApplyFoundationToSlope(Foundation f, Slope *s);
00127 static inline uint ApplyPixelFoundationToSlope(Foundation f, Slope *s)
00128 {
00129   return ApplyFoundationToSlope(f, s) * TILE_HEIGHT;
00130 }
00131 
00132 void DrawFoundation(TileInfo *ti, Foundation f);
00133 bool HasFoundationNW(TileIndex tile, Slope slope_here, uint z_here);
00134 bool HasFoundationNE(TileIndex tile, Slope slope_here, uint z_here);
00135 
00136 void DoClearSquare(TileIndex tile);
00137 void RunTileLoop();
00138 
00139 void InitializeLandscape();
00140 void GenerateLandscape(byte mode);
00141 
00142 #endif /* LANDSCAPE_H */