newgrf_generic.cpp

00001 /* $Id: newgrf_generic.cpp 12871 2008-04-24 14:33:18Z rubidium $ */
00002 
00003 #include "stdafx.h"
00004 #include "openttd.h"
00005 #include "variables.h"
00006 #include "landscape.h"
00007 #include "debug.h"
00008 #include "newgrf.h"
00009 #include "newgrf_callbacks.h"
00010 #include "newgrf_commons.h"
00011 #include "newgrf_spritegroup.h"
00012 #include "newgrf_generic.h"
00013 #include "tile_map.h"
00014 #include <list>
00015 
00016 
00017 struct GenericCallback {
00018   const GRFFile *file;
00019   const SpriteGroup *group;
00020 
00021   GenericCallback(const GRFFile *file, const SpriteGroup *group) :
00022     file(file),
00023     group(group)
00024   { }
00025 };
00026 
00027 typedef std::list<GenericCallback> GenericCallbackList;
00028 
00029 static GenericCallbackList _gcl[GSF_END];
00030 
00031 
00035 void ResetGenericCallbacks()
00036 {
00037   for (uint8 feature = 0; feature < lengthof(_gcl); feature++) {
00038     _gcl[feature].clear();
00039   }
00040 }
00041 
00042 
00049 void AddGenericCallback(uint8 feature, const GRFFile *file, const SpriteGroup *group)
00050 {
00051   if (feature >= lengthof(_gcl)) {
00052     grfmsg(5, "AddGenericCallback: Unsupported feature 0x%02X", feature);
00053     return;
00054   }
00055 
00056   /* Generic feature callbacks are evaluated in reverse (i.e. the last group
00057    * to be added is evaluated first, etc) thus we push the group to the
00058    * beginning of the list so a standard iterator will do the right thing. */
00059   _gcl[feature].push_front(GenericCallback(file, group));
00060 }
00061 
00062 
00063 static uint32 GenericCallbackGetRandomBits(const ResolverObject *object)
00064 {
00065   return 0;
00066 }
00067 
00068 
00069 static uint32 GenericCallbackGetTriggers(const ResolverObject *object)
00070 {
00071   return 0;
00072 }
00073 
00074 
00075 static void GenericCallbackSetTriggers(const ResolverObject *object, int triggers)
00076 {
00077   return;
00078 }
00079 
00080 
00081 static uint32 GenericCallbackGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
00082 {
00083   switch (variable) {
00084     case 0x40: return object->u.generic.cargo_type;
00085 
00086     case 0x80: return object->u.generic.cargo_type;
00087     case 0x81: return object->u.generic.cargo_type;
00088     case 0x82: return object->u.generic.default_selection;
00089     case 0x83: return object->u.generic.src_industry;
00090     case 0x84: return object->u.generic.dst_industry;
00091     case 0x85: return object->u.generic.distance;
00092     case 0x86: return object->u.generic.event;
00093     case 0x87: return object->u.generic.count;
00094     case 0x88: return object->u.generic.station_size;
00095 
00096     default: break;
00097   }
00098 
00099   DEBUG(grf, 1, "Unhandled generic feature property 0x%02X", variable);
00100 
00101   *available = false;
00102   return 0;
00103 }
00104 
00105 
00106 static const SpriteGroup *GenericCallbackResolveReal(const ResolverObject *object, const SpriteGroup *group)
00107 {
00108   if (group->g.real.num_loaded == 0) return NULL;
00109 
00110   return group->g.real.loaded[0];
00111 }
00112 
00113 
00114 static inline void NewGenericResolver(ResolverObject *res)
00115 {
00116   res->GetRandomBits = &GenericCallbackGetRandomBits;
00117   res->GetTriggers   = &GenericCallbackGetTriggers;
00118   res->SetTriggers   = &GenericCallbackSetTriggers;
00119   res->GetVariable   = &GenericCallbackGetVariable;
00120   res->ResolveReal   = &GenericCallbackResolveReal;
00121 
00122   res->callback        = CBID_NO_CALLBACK;
00123   res->callback_param1 = 0;
00124   res->callback_param2 = 0;
00125   res->last_value      = 0;
00126   res->trigger         = 0;
00127   res->reseed          = 0;
00128 }
00129 
00130 
00138 static uint16 GetGenericCallbackResult(uint8 feature, ResolverObject *object, const GRFFile **file)
00139 {
00140   assert(feature < lengthof(_gcl));
00141 
00142   /* Test each feature callback sprite group. */
00143   for (GenericCallbackList::const_iterator it = _gcl[feature].begin(); it != _gcl[feature].end(); ++it) {
00144     const SpriteGroup *group = it->group;
00145     group = Resolve(group, object);
00146     if (group == NULL || group->type != SGT_CALLBACK) continue;
00147 
00148     /* Return NewGRF file if necessary */
00149     if (file != NULL) *file = it->file;
00150 
00151     return group->g.callback.result;
00152   }
00153 
00154   /* No callback returned a valid result, so we've failed. */
00155   return CALLBACK_FAILED;
00156 }
00157 
00158 
00162 uint16 GetAiPurchaseCallbackResult(uint8 feature, CargoID cargo_type, uint8 default_selection, IndustryType src_industry, IndustryType dst_industry, uint8 distance, AIConstructionEvent event, uint8 count, uint8 station_size, const GRFFile **file)
00163 {
00164   ResolverObject object;
00165 
00166   NewGenericResolver(&object);
00167 
00168   object.callback = CBID_GENERIC_AI_PURCHASE_SELECTION;
00169   object.u.generic.cargo_type        = cargo_type;
00170   object.u.generic.default_selection = default_selection;
00171   object.u.generic.src_industry      = src_industry;
00172   object.u.generic.dst_industry      = dst_industry;
00173   object.u.generic.distance          = distance;
00174   object.u.generic.event             = event;
00175   object.u.generic.count             = count;
00176   object.u.generic.station_size      = station_size;
00177 
00178   uint16 callback = GetGenericCallbackResult(feature, &object, file);
00179   if (callback != CALLBACK_FAILED) callback = GB(callback, 0, 8);
00180   return callback;
00181 }

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