src/newgrf_town.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 newgrf_town.h Functions to handle the town part of NewGRF towns. */
   9
  10 #ifndef NEWGRF_TOWN_H
  11 #define NEWGRF_TOWN_H
  12
  13 #include "town_type.h"
  14 #include "newgrf_spritegroup.h"
  15
  16 /**
  17  * Scope resolver for a town.
  18  * @note Currently there is no direct town resolver; we only need to get town
  19  *       variable results from inside stations, house tiles and industries,
  20  *       and to check the town's persistent storage.
  21  */
  22 struct TownScopeResolver : public ScopeResolver {
  23         Town *t;       ///< %Town of the scope.
  24         bool readonly; ///< When set, persistent storage of the town is read-only,
  25
  26         /**
  27          * Resolver of a town scope.
  28          * @param ro Surrounding resolver.
  29          * @param t %Town of the scope.
  30          * @param readonly Scope may change persistent storage of the town.
  31          */
  32         TownScopeResolver(ResolverObject &ro, Town *t, bool readonly)
  33                 : ScopeResolver(ro), t(t), readonly(readonly)
  34         {
  35         }
  36
  37         uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
  38         void StorePSA(uint reg, int32_t value) override;
  39 };
  40
  41 /** Resolver of town properties. */
  42 struct TownResolverObject : public ResolverObject {
  43         TownScopeResolver town_scope; ///< Scope resolver specific for towns.
  44
  45         TownResolverObject(const struct GRFFile *grffile, Town *t, bool readonly);
  46
  47         ScopeResolver *GetScope(VarSpriteGroupScope scope = VSG_SCOPE_SELF, byte relative = 0) override
  48         {
  49                 switch (scope) {
  50                         case VSG_SCOPE_SELF: return &town_scope;
  51                         default: return ResolverObject::GetScope(scope, relative);
  52                 }
  53         }
  54 };
  55
  56 #endif /* NEWGRF_TOWN_H */