src/clear_map.h

   1 /*
   2  * This file is part of OpenTTD.
   3  * 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.
   4  * 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.
   5  * 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/>.
   6  */
   7
   8 /** @file clear_map.h Map accessors for 'clear' tiles */
   9
  10 #ifndef CLEAR_MAP_H
  11 #define CLEAR_MAP_H
  12
  13 #include "bridge_map.h"
  14 #include "industry_type.h"
  15
  16 /**
  17  * Ground types. Valid densities in comments after the enum.
  18  */
  19 enum ClearGround {
  20         CLEAR_GRASS  = 0, ///< 0-3
  21         CLEAR_ROUGH  = 1, ///< 3
  22         CLEAR_ROCKS  = 2, ///< 3
  23         CLEAR_FIELDS = 3, ///< 3
  24         CLEAR_SNOW   = 4, ///< 0-3
  25         CLEAR_DESERT = 5, ///< 1,3
  26 };
  27
  28
  29 /**
  30  * Test if a tile is covered with snow.
  31  * @param t the tile to check
  32  * @pre IsTileType(t, MP_CLEAR)
  33  * @return whether the tile is covered with snow.
  34  */
  35 inline bool IsSnowTile(Tile t)
  36 {
  37         assert(IsTileType(t, MP_CLEAR));
  38         return HasBit(t.m3(), 4);
  39 }
  40
  41 /**
  42  * Get the type of clear tile but never return CLEAR_SNOW.
  43  * @param t the tile to get the clear ground type of
  44  * @pre IsTileType(t, MP_CLEAR)
  45  * @return the ground type
  46  */
  47 inline ClearGround GetRawClearGround(Tile t)
  48 {
  49         assert(IsTileType(t, MP_CLEAR));
  50         return (ClearGround)GB(t.m5(), 2, 3);
  51 }
  52
  53 /**
  54  * Get the type of clear tile.
  55  * @param t the tile to get the clear ground type of
  56  * @pre IsTileType(t, MP_CLEAR)
  57  * @return the ground type
  58  */
  59 inline ClearGround GetClearGround(Tile t)
  60 {
  61         if (IsSnowTile(t)) return CLEAR_SNOW;
  62         return GetRawClearGround(t);
  63 }
  64
  65 /**
  66  * Set the type of clear tile.
  67  * @param t  the tile to set the clear ground type of
  68  * @param ct the ground type
  69  * @pre IsTileType(t, MP_CLEAR)
  70  */
  71 inline bool IsClearGround(Tile t, ClearGround ct)
  72 {
  73         return GetClearGround(t) == ct;
  74 }
  75
  76
  77 /**
  78  * Get the density of a non-field clear tile.
  79  * @param t the tile to get the density of
  80  * @pre IsTileType(t, MP_CLEAR)
  81  * @return the density
  82  */
  83 inline uint GetClearDensity(Tile t)
  84 {
  85         assert(IsTileType(t, MP_CLEAR));
  86         return GB(t.m5(), 0, 2);
  87 }
  88
  89 /**
  90  * Increment the density of a non-field clear tile.
  91  * @param t the tile to increment the density of
  92  * @param d the amount to increment the density with
  93  * @pre IsTileType(t, MP_CLEAR)
  94  */
  95 inline void AddClearDensity(Tile t, int d)
  96 {
  97         assert(IsTileType(t, MP_CLEAR)); // XXX incomplete
  98         t.m5() += d;
  99 }
 100
 101 /**
 102  * Set the density of a non-field clear tile.
 103  * @param t the tile to set the density of
 104  * @param d the new density
 105  * @pre IsTileType(t, MP_CLEAR)
 106  */
 107 inline void SetClearDensity(Tile t, uint d)
 108 {
 109         assert(IsTileType(t, MP_CLEAR));
 110         SB(t.m5(), 0, 2, d);
 111 }
 112
 113
 114 /**
 115  * Get the counter used to advance to the next clear density/field type.
 116  * @param t the tile to get the counter of
 117  * @pre IsTileType(t, MP_CLEAR)
 118  * @return the value of the counter
 119  */
 120 inline uint GetClearCounter(Tile t)
 121 {
 122         assert(IsTileType(t, MP_CLEAR));
 123         return GB(t.m5(), 5, 3);
 124 }
 125
 126 /**
 127  * Increments the counter used to advance to the next clear density/field type.
 128  * @param t the tile to increment the counter of
 129  * @param c the amount to increment the counter with
 130  * @pre IsTileType(t, MP_CLEAR)
 131  */
 132 inline void AddClearCounter(Tile t, int c)
 133 {
 134         assert(IsTileType(t, MP_CLEAR)); // XXX incomplete
 135         t.m5() += c << 5;
 136 }
 137
 138 /**
 139  * Sets the counter used to advance to the next clear density/field type.
 140  * @param t the tile to set the counter of
 141  * @param c the amount to set the counter to
 142  * @pre IsTileType(t, MP_CLEAR)
 143  */
 144 inline void SetClearCounter(Tile t, uint c)
 145 {
 146         assert(IsTileType(t, MP_CLEAR)); // XXX incomplete
 147         SB(t.m5(), 5, 3, c);
 148 }
 149
 150
 151 /**
 152  * Sets ground type and density in one go, also sets the counter to 0
 153  * @param t       the tile to set the ground type and density for
 154  * @param type    the new ground type of the tile
 155  * @param density the density of the ground tile
 156  * @pre IsTileType(t, MP_CLEAR)
 157  */
 158 inline void SetClearGroundDensity(Tile t, ClearGround type, uint density)
 159 {
 160         assert(IsTileType(t, MP_CLEAR)); // XXX incomplete
 161         t.m5() = 0 << 5 | type << 2 | density;
 162 }
 163
 164
 165 /**
 166  * Get the field type (production stage) of the field
 167  * @param t the field to get the type of
 168  * @pre GetClearGround(t) == CLEAR_FIELDS
 169  * @return the field type
 170  */
 171 inline uint GetFieldType(Tile t)
 172 {
 173         assert(GetClearGround(t) == CLEAR_FIELDS);
 174         return GB(t.m3(), 0, 4);
 175 }
 176
 177 /**
 178  * Set the field type (production stage) of the field
 179  * @param t the field to get the type of
 180  * @param f the field type
 181  * @pre GetClearGround(t) == CLEAR_FIELDS
 182  */
 183 inline void SetFieldType(Tile t, uint f)
 184 {
 185         assert(GetClearGround(t) == CLEAR_FIELDS); // XXX incomplete
 186         SB(t.m3(), 0, 4, f);
 187 }
 188
 189 /**
 190  * Get the industry (farm) that made the field
 191  * @param t the field to get creating industry of
 192  * @pre GetClearGround(t) == CLEAR_FIELDS
 193  * @return the industry that made the field
 194  */
 195 inline IndustryID GetIndustryIndexOfField(Tile t)
 196 {
 197         assert(GetClearGround(t) == CLEAR_FIELDS);
 198         return(IndustryID) t.m2();
 199 }
 200
 201 /**
 202  * Set the industry (farm) that made the field
 203  * @param t the field to get creating industry of
 204  * @param i the industry that made the field
 205  * @pre GetClearGround(t) == CLEAR_FIELDS
 206  */
 207 inline void SetIndustryIndexOfField(Tile t, IndustryID i)
 208 {
 209         assert(GetClearGround(t) == CLEAR_FIELDS);
 210         t.m2() = i;
 211 }
 212
 213
 214 /**
 215  * Is there a fence at the given border?
 216  * @param t the tile to check for fences
 217  * @param side the border to check
 218  * @pre IsClearGround(t, CLEAR_FIELDS)
 219  * @return 0 if there is no fence, otherwise the fence type
 220  */
 221 inline uint GetFence(Tile t, DiagDirection side)
 222 {
 223         assert(IsClearGround(t, CLEAR_FIELDS));
 224         switch (side) {
 225                 default: NOT_REACHED();
 226                 case DIAGDIR_SE: return GB(t.m4(), 2, 3);
 227                 case DIAGDIR_SW: return GB(t.m4(), 5, 3);
 228                 case DIAGDIR_NE: return GB(t.m3(), 5, 3);
 229                 case DIAGDIR_NW: return GB(t.m6(), 2, 3);
 230         }
 231 }
 232
 233 /**
 234  * Sets the type of fence (and whether there is one) for the given border.
 235  * @param t the tile to check for fences
 236  * @param side the border to check
 237  * @param h 0 if there is no fence, otherwise the fence type
 238  * @pre IsClearGround(t, CLEAR_FIELDS)
 239  */
 240 inline void SetFence(Tile t, DiagDirection side, uint h)
 241 {
 242         assert(IsClearGround(t, CLEAR_FIELDS));
 243         switch (side) {
 244                 default: NOT_REACHED();
 245                 case DIAGDIR_SE: SB(t.m4(), 2, 3, h); break;
 246                 case DIAGDIR_SW: SB(t.m4(), 5, 3, h); break;
 247                 case DIAGDIR_NE: SB(t.m3(), 5, 3, h); break;
 248                 case DIAGDIR_NW: SB(t.m6(), 2, 3, h); break;
 249         }
 250 }
 251
 252
 253 /**
 254  * Make a clear tile.
 255  * @param t       the tile to make a clear tile
 256  * @param g       the type of ground
 257  * @param density the density of the grass/snow/desert etc
 258  */
 259 inline void MakeClear(Tile t, ClearGround g, uint density)
 260 {
 261         SetTileType(t, MP_CLEAR);
 262         t.m1() = 0;
 263         SetTileOwner(t, OWNER_NONE);
 264         t.m2() = 0;
 265         t.m3() = 0;
 266         t.m4() = 0 << 5 | 0 << 2;
 267         SetClearGroundDensity(t, g, density); // Sets m5
 268         t.m6() = 0;
 269         t.m7() = 0;
 270         t.m8() = 0;
 271 }
 272
 273
 274 /**
 275  * Make a (farm) field tile.
 276  * @param t          the tile to make a farm field
 277  * @param field_type the 'growth' level of the field
 278  * @param industry   the industry this tile belongs to
 279  */
 280 inline void MakeField(Tile t, uint field_type, IndustryID industry)
 281 {
 282         SetTileType(t, MP_CLEAR);
 283         t.m1() = 0;
 284         SetTileOwner(t, OWNER_NONE);
 285         t.m2() = industry;
 286         t.m3() = field_type;
 287         t.m4() = 0 << 5 | 0 << 2;
 288         SetClearGroundDensity(t, CLEAR_FIELDS, 3);
 289         SB(t.m6(), 2, 4, 0);
 290         t.m7() = 0;
 291         t.m8() = 0;
 292 }
 293
 294 /**
 295  * Make a snow tile.
 296  * @param t the tile to make snowy
 297  * @param density The density of snowiness.
 298  * @pre GetClearGround(t) != CLEAR_SNOW
 299  */
 300 inline void MakeSnow(Tile t, uint density = 0)
 301 {
 302         assert(GetClearGround(t) != CLEAR_SNOW);
 303         SetBit(t.m3(), 4);
 304         if (GetRawClearGround(t) == CLEAR_FIELDS) {
 305                 SetClearGroundDensity(t, CLEAR_GRASS, density);
 306         } else {
 307                 SetClearDensity(t, density);
 308         }
 309 }
 310
 311 /**
 312  * Clear the snow from a tile and return it to its previous type.
 313  * @param t the tile to clear of snow
 314  * @pre GetClearGround(t) == CLEAR_SNOW
 315  */
 316 inline void ClearSnow(Tile t)
 317 {
 318         assert(GetClearGround(t) == CLEAR_SNOW);
 319         ClrBit(t.m3(), 4);
 320         SetClearDensity(t, 3);
 321 }
 322
 323 #endif /* CLEAR_MAP_H */