newgrf_industries.cpp

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/*
 * This file is part of OpenTTD.
 * 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.
 * 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.
 * 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/>.
 */
 
#include "stdafx.h"
#include "debug.h"
#include "industry.h"
#include "newgrf_badge.h"
#include "newgrf_industries.h"
#include "newgrf_town.h"
#include "newgrf_cargo.h"
#include "window_func.h"
#include "town.h"
#include "company_base.h"
#include "error.h"
#include "strings_func.h"
#include "core/random_func.hpp"
#include "timer/timer_game_calendar.h"
 
#include "table/strings.h"
 
#include "safeguards.h"
 
/* Since the industry IDs defined by the GRF file don't necessarily correlate
 * to those used by the game, the IDs used for overriding old industries must be
 * translated when the idustry spec is set. */
IndustryOverrideManager _industry_mngr(NEW_INDUSTRYOFFSET, NUM_INDUSTRYTYPES, IT_INVALID);
IndustryTileOverrideManager _industile_mngr(NEW_INDUSTRYTILEOFFSET, NUM_INDUSTRYTILES, INVALID_INDUSTRYTILE);
 
IndustryType MapNewGRFIndustryType(IndustryType grf_type, uint32_t grf_id)
{
  if (grf_type == IT_INVALID) return IT_INVALID;
  if (!HasBit(grf_type, 7)) return GB(grf_type, 0, 7);
 
  return _industry_mngr.GetID(GB(grf_type, 0, 7), grf_id);
}
IndustryType MapNewGRFIndustryType(IndustryType grf_type, uint32_t grf_id) {…}
 
uint32_t GetIndustryIDAtOffset(TileIndex tile, const Industry *i, uint32_t cur_grfid)
{
  if (!i->TileBelongsToIndustry(tile)) {
    /* No industry and/or the tile does not have the same industry as the one we match it with */
    return 0xFFFF;
  }
 
  IndustryGfx gfx = GetCleanIndustryGfx(tile);
  const IndustryTileSpec *indtsp = GetIndustryTileSpec(gfx);
 
  if (gfx < NEW_INDUSTRYTILEOFFSET) { // Does it belongs to an old type?
    /* It is an old tile.  We have to see if it's been overridden */
    if (indtsp->grf_prop.override_id == INVALID_INDUSTRYTILE) { // has it been overridden?
      return 0xFF << 8 | gfx; // no. Tag FF + the gfx id of that tile
    }
    /* Overridden */
    const IndustryTileSpec *tile_ovr = GetIndustryTileSpec(indtsp->grf_prop.override_id);
 
    if (tile_ovr->grf_prop.grfid == cur_grfid) {
      return tile_ovr->grf_prop.local_id; // same grf file
    } else {
      return 0xFFFE; // not the same grf file
    }
  }
  /* Not an 'old type' tile */
  if (indtsp->grf_prop.HasSpriteGroups()) {
    if (indtsp->grf_prop.grfid == cur_grfid) { // same industry, same grf ?
      return indtsp->grf_prop.local_id;
    } else {
      return 0xFFFE; // Defined in another grf file
    }
  }
  /* The tile has no spritegroup */
  return 0xFF << 8 | indtsp->grf_prop.subst_id; // so just give it the substitute
}
uint32_t GetIndustryIDAtOffset(TileIndex tile, const Industry *i, uint32_t cur_grfid) {…}
 
static uint32_t GetClosestIndustry(TileIndex tile, IndustryType type, const Industry *current)
{
  uint32_t best_dist = UINT32_MAX;
 
  for (const IndustryID &industry : Industry::industries[type]) {
    if (industry == current->index) continue;
 
    best_dist = std::min(best_dist, DistanceManhattan(tile, Industry::Get(industry)->location.tile));
  }
 
  return best_dist;
}
 
static uint32_t GetCountAndDistanceOfClosestInstance(const ResolverObject &object, uint8_t param_set_id, uint8_t layout_filter, bool town_filter, const Industry *current)
{
  uint32_t grf_id = static_cast<uint32_t>(object.GetRegister(0x100)); 
  IndustryType industry_type;
  uint32_t closest_dist = UINT32_MAX;
  uint8_t count = 0;
 
  /* Determine what will be the industry type to look for */
  switch (grf_id) {
    case 0:  // this is a default industry type
      industry_type = param_set_id;
      break;
 
    case 0xFFFFFFFF: // current grf
      grf_id = GetIndustrySpec(current->type)->grf_prop.grfid;
      [[fallthrough]];
 
    default: // use the grfid specified in register 100h
      SetBit(param_set_id, 7); // bit 7 means it is not an old type
      industry_type = MapNewGRFIndustryType(param_set_id, grf_id);
      break;
  }
 
  /* If the industry type is invalid, there is none and the closest is far away. */
  if (industry_type >= NUM_INDUSTRYTYPES) return 0 | 0xFFFF;
 
  if (layout_filter == 0 && !town_filter) {
    /* If the filter is 0, it could be because none was specified as well as being really a 0.
     * In either case, just do the regular var67 */
    closest_dist = GetClosestIndustry(current->location.tile, industry_type, current);
    count = ClampTo<uint8_t>(Industry::GetIndustryTypeCount(industry_type));
  } else {
    /* Count only those who match the same industry type and layout filter
     * Unfortunately, we have to do it manually */
    for (const IndustryID &industry : Industry::industries[industry_type]) {
      if (industry == current->index) continue;
 
      const Industry *i = Industry::Get(industry);
      if ((layout_filter == 0 || i->selected_layout == layout_filter) && (!town_filter || i->town == current->town)) {
        closest_dist = std::min(closest_dist, DistanceManhattan(current->location.tile, i->location.tile));
        count++;
      }
    }
  }
 
  return count << 16 | GB(closest_dist, 0, 16);
}
static uint32_t GetCountAndDistanceOfClosestInstance(const ResolverObject &object, uint8_t param_set_id, uint8_t layout_filter, bool town_filter, const Industry *current) {…}
 
/* virtual */ uint32_t IndustriesScopeResolver::GetVariable(uint8_t variable, [[maybe_unused]] uint32_t parameter, bool &available) const
{
  if (this->ro.callback == CBID_INDUSTRY_LOCATION) {
    /* Variables available during construction check. */
 
    switch (variable) {
      case 0x7A: return GetBadgeVariableResult(*this->ro.grffile, GetIndustrySpec(this->type)->badges, parameter);
 
      case 0x80: return this->tile.base();
      case 0x81: return GB(this->tile.base(), 8, 8);
 
      /* Pointer to the town the industry is associated with */
      case 0x82: return this->industry->town->index.base();
      case 0x83:
      case 0x84:
      case 0x85: Debug(grf, 0, "NewGRFs shouldn't be doing pointer magic"); break; // not supported
 
      /* Number of the layout */
      case 0x86: return this->industry->selected_layout;
 
      /* Ground type */
      case 0x87: return GetTerrainType(this->tile);
 
      /* Town zone */
      case 0x88: return to_underlying(GetTownRadiusGroup(this->industry->town, this->tile));
 
      /* Manhattan distance of the closest town */
      case 0x89: return ClampTo<uint8_t>(DistanceManhattan(this->industry->town->xy, this->tile));
 
      /* Lowest height of the tile */
      case 0x8A: return ClampTo<uint8_t>(GetTileZ(this->tile) * (this->ro.grffile->grf_version >= 8 ? 1 : TILE_HEIGHT));
 
      /* Distance to the nearest water/land tile */
      case 0x8B: return GetClosestWaterDistance(this->tile, !GetIndustrySpec(this->industry->type)->behaviour.Test(IndustryBehaviour::BuiltOnWater));
 
      /* Square of Euclidean distance from town */
      case 0x8D: return ClampTo<uint16_t>(DistanceSquare(this->industry->town->xy, this->tile));
 
      /* 32 random bits */
      case 0x8F: return this->random_bits;
    }
  }
 
  const IndustrySpec *indspec = GetIndustrySpec(this->type);
 
  if (this->industry == nullptr) {
    Debug(grf, 1, "Unhandled variable 0x{:X} (no available industry) in callback 0x{:x}", variable, this->ro.callback);
 
    available = false;
    return UINT_MAX;
  }
 
  switch (variable) {
    case 0x40:
    case 0x41:
    case 0x42: { // waiting cargo, but only if those two callback flags are set
      IndustryCallbackMasks callback = indspec->callback_mask;
      if (callback.Any({IndustryCallbackMask::ProductionCargoArrival, IndustryCallbackMask::Production256Ticks})) {
        if (indspec->behaviour.Test(IndustryBehaviour::ProdMultiHandling)) {
          if (this->industry->prod_level == 0) return 0;
          return ClampTo<uint16_t>(this->industry->GetAccepted(variable - 0x40).waiting / this->industry->prod_level);
        } else {
          return ClampTo<uint16_t>(this->industry->GetAccepted(variable - 0x40).waiting);
        }
      } else {
        return 0;
      }
    }
 
    /* Manhattan distance of closes dry/water tile */
    case 0x43:
      if (this->tile == INVALID_TILE) break;
      return GetClosestWaterDistance(this->tile, !indspec->behaviour.Test(IndustryBehaviour::BuiltOnWater));
 
    /* Layout number */
    case 0x44: return this->industry->selected_layout;
 
    /* Company info */
    case 0x45: {
      uint8_t colours = 0;
      bool is_ai = false;
 
      const Company *c = Company::GetIfValid(this->industry->founder);
      if (c != nullptr) {
        const Livery *l = &c->livery[LS_DEFAULT];
 
        is_ai = c->is_ai;
        colours = l->colour1 + l->colour2 * 16;
      }
 
      return this->industry->founder.base() | (is_ai ? 0x10000 : 0) | (colours << 24);
    }
 
    case 0x46: return this->industry->construction_date.base(); // Date when built - long format - (in days)
 
    /* Override flags from GS */
    case 0x47: return this->industry->ctlflags.base();
 
    /* Get industry ID at offset param */
    case 0x60: return GetIndustryIDAtOffset(GetNearbyTile(parameter, this->industry->location.tile, false), this->industry, this->ro.grffile->grfid);
 
    /* Get random tile bits at offset param */
    case 0x61: {
      if (this->tile == INVALID_TILE) break;
      TileIndex tile = GetNearbyTile(parameter, this->tile, false);
      return this->industry->TileBelongsToIndustry(tile) ? GetIndustryRandomBits(tile) : 0;
    }
 
    /* Land info of nearby tiles */
    case 0x62:
      if (this->tile == INVALID_TILE) break;
      return GetNearbyIndustryTileInformation(parameter, this->tile, IndustryID::Invalid(), false, this->ro.grffile->grf_version >= 8);
 
    /* Animation stage of nearby tiles */
    case 0x63: {
      if (this->tile == INVALID_TILE) break;
      TileIndex tile = GetNearbyTile(parameter, this->tile, false);
      if (this->industry->TileBelongsToIndustry(tile)) {
        return GetAnimationFrame(tile);
      }
      return 0xFFFFFFFF;
    }
 
    /* Distance of nearest industry of given type */
    case 0x64: {
      if (this->tile == INVALID_TILE) break;
      IndustryType type = MapNewGRFIndustryType(parameter, indspec->grf_prop.grfid);
      if (type >= NUM_INDUSTRYTYPES) return UINT32_MAX;
      return GetClosestIndustry(this->tile, type, this->industry);
    }
    /* Get town zone and Manhattan distance of closest town */
    case 0x65: {
      if (this->tile == INVALID_TILE) break;
      TileIndex tile = GetNearbyTile(parameter, this->tile, true);
      return to_underlying(GetTownRadiusGroup(this->industry->town, tile)) << 16 | ClampTo<uint16_t>(DistanceManhattan(tile, this->industry->town->xy));
    }
    /* Get square of Euclidean distance of closest town */
    case 0x66: {
      if (this->tile == INVALID_TILE) break;
      TileIndex tile = GetNearbyTile(parameter, this->tile, true);
      return DistanceSquare(tile, this->industry->town->xy);
    }
 
    /* Count of industry, distance of closest instance
     * 68 is the same as 67, but with a filtering on selected layout */
    case 0x67:
    case 0x68: {
      uint8_t layout_filter = 0;
      bool town_filter = false;
      if (variable == 0x68) {
        int32_t reg = this->ro.GetRegister(0x101);
        layout_filter = GB(reg, 0, 8);
        town_filter = HasBit(reg, 8);
      }
      return GetCountAndDistanceOfClosestInstance(this->ro, parameter, layout_filter, town_filter, this->industry);
    }
 
    case 0x69:
    case 0x6A:
    case 0x6B:
    case 0x6C:
    case 0x6D:
    case 0x70:
    case 0x71: {
      CargoType cargo = GetCargoTranslation(parameter, this->ro.grffile);
      if (!IsValidCargoType(cargo)) return 0;
      auto it = this->industry->GetCargoProduced(cargo);
      if (it == std::end(this->industry->produced)) return 0; // invalid cargo
      switch (variable) {
        case 0x69: return it->waiting;
        case 0x6A: return it->history[THIS_MONTH].production;
        case 0x6B: return it->history[THIS_MONTH].transported;
        case 0x6C: return it->history[LAST_MONTH].production;
        case 0x6D: return it->history[LAST_MONTH].transported;
        case 0x70: return it->rate;
        case 0x71: return it->history[LAST_MONTH].PctTransported();
        default: NOT_REACHED();
      }
    }
 
 
    case 0x6E:
    case 0x6F: {
      CargoType cargo = GetCargoTranslation(parameter, this->ro.grffile);
      if (!IsValidCargoType(cargo)) return 0;
      auto it = this->industry->GetCargoAccepted(cargo);
      if (it == std::end(this->industry->accepted)) return 0; // invalid cargo
      if (variable == 0x6E) return it->last_accepted.base();
      if (variable == 0x6F) return it->waiting;
      NOT_REACHED();
    }
 
    case 0x7A: return GetBadgeVariableResult(*this->ro.grffile, GetIndustrySpec(this->type)->badges, parameter);
 
    /* Get a variable from the persistent storage */
    case 0x7C: return (this->industry->psa != nullptr) ? this->industry->psa->GetValue(parameter) : 0;
 
    /* Industry structure access*/
    case 0x80: return this->industry->location.tile.base();
    case 0x81: return GB(this->industry->location.tile.base(), 8, 8);
    /* Pointer to the town the industry is associated with */
    case 0x82: return this->industry->town->index.base();
    case 0x83:
    case 0x84:
    case 0x85: Debug(grf, 0, "NewGRFs shouldn't be doing pointer magic"); break; // not supported
    case 0x86: return this->industry->location.w;
    case 0x87: return this->industry->location.h;// xy dimensions
 
    case 0x88:
    case 0x89: return this->industry->GetProduced(variable - 0x88).cargo;
    case 0x8A: return this->industry->GetProduced(0).waiting;
    case 0x8B: return GB(this->industry->GetProduced(0).waiting, 8, 8);
    case 0x8C: return this->industry->GetProduced(1).waiting;
    case 0x8D: return GB(this->industry->GetProduced(1).waiting, 8, 8);
    case 0x8E:
    case 0x8F: return this->industry->GetProduced(variable - 0x8E).rate;
    case 0x90:
    case 0x91:
    case 0x92: return this->industry->GetAccepted(variable - 0x90).cargo;
    case 0x93: return this->industry->prod_level;
    /* amount of cargo produced so far THIS month. */
    case 0x94: return this->industry->GetProduced(0).history[THIS_MONTH].production;
    case 0x95: return GB(this->industry->GetProduced(0).history[THIS_MONTH].production, 8, 8);
    case 0x96: return this->industry->GetProduced(1).history[THIS_MONTH].production;
    case 0x97: return GB(this->industry->GetProduced(1).history[THIS_MONTH].production, 8, 8);
    /* amount of cargo transported so far THIS month. */
    case 0x98: return this->industry->GetProduced(0).history[THIS_MONTH].transported;
    case 0x99: return GB(this->industry->GetProduced(0).history[THIS_MONTH].transported, 8, 8);
    case 0x9A: return this->industry->GetProduced(1).history[THIS_MONTH].transported;
    case 0x9B: return GB(this->industry->GetProduced(1).history[THIS_MONTH].transported, 8, 8);
    /* fraction of cargo transported LAST month. */
    case 0x9C:
    case 0x9D: return this->industry->GetProduced(variable - 0x9C).history[LAST_MONTH].PctTransported();
    /* amount of cargo produced LAST month. */
    case 0x9E: return this->industry->GetProduced(0).history[LAST_MONTH].production;
    case 0x9F: return GB(this->industry->GetProduced(0).history[LAST_MONTH].production, 8, 8);
    case 0xA0: return this->industry->GetProduced(1).history[LAST_MONTH].production;
    case 0xA1: return GB(this->industry->GetProduced(1).history[LAST_MONTH].production, 8, 8);
    /* amount of cargo transported last month. */
    case 0xA2: return this->industry->GetProduced(0).history[LAST_MONTH].transported;
    case 0xA3: return GB(this->industry->GetProduced(0).history[LAST_MONTH].transported, 8, 8);
    case 0xA4: return this->industry->GetProduced(1).history[LAST_MONTH].transported;
    case 0xA5: return GB(this->industry->GetProduced(1).history[LAST_MONTH].transported, 8, 8);
 
    case 0xA6: return indspec->grf_prop.local_id;
    case 0xA7: return this->industry->founder.base();
    case 0xA8: return this->industry->random_colour;
    case 0xA9: return ClampTo<uint8_t>(this->industry->last_prod_year - EconomyTime::ORIGINAL_BASE_YEAR);
    case 0xAA: return this->industry->counter;
    case 0xAB: return GB(this->industry->counter, 8, 8);
    case 0xAC: return this->industry->was_cargo_delivered;
 
    case 0xB0: return ClampTo<uint16_t>(this->industry->construction_date - CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR); // Date when built since 1920 (in days)
    case 0xB3: return this->industry->construction_type; // Construction type
    case 0xB4: {
      if (this->industry->accepted.empty()) return 0;
      auto it = std::max_element(std::begin(this->industry->accepted), std::end(this->industry->accepted), [](const auto &a, const auto &b) { return a.last_accepted < b.last_accepted; });
      return ClampTo<uint16_t>(it->last_accepted - EconomyTime::DAYS_TILL_ORIGINAL_BASE_YEAR); // Date last cargo accepted since 1920 (in days)
    }
  }
 
  Debug(grf, 1, "Unhandled industry variable 0x{:X}", variable);
 
  available = false;
  return UINT_MAX;
}
/* virtual */ uint32_t IndustriesScopeResolver::GetVariable(uint8_t variable, [[maybe_unused]] uint32_t parameter, bool &available) const {…}
 
/* virtual */ uint32_t IndustriesScopeResolver::GetRandomBits() const
{
  return this->industry != nullptr ? this->industry->random : 0;
}
/* virtual */ uint32_t IndustriesScopeResolver::GetRandomBits() const {…}
 
/* virtual */ uint32_t IndustriesScopeResolver::GetRandomTriggers() const
{
  return 0;
}
/* virtual */ uint32_t IndustriesScopeResolver::GetRandomTriggers() const {…}
 
/* virtual */ void IndustriesScopeResolver::StorePSA(uint pos, int32_t value)
{
  if (this->industry->index == IndustryID::Invalid()) return;
 
  if (this->industry->psa == nullptr) {
    /* There is no need to create a storage if the value is zero. */
    if (value == 0) return;
 
    /* Create storage on first modification. */
    const IndustrySpec *indsp = GetIndustrySpec(this->industry->type);
    assert(PersistentStorage::CanAllocateItem());
    this->industry->psa = new PersistentStorage(indsp->grf_prop.grfid, GSF_INDUSTRIES, this->industry->location.tile);
  }
 
  this->industry->psa->StoreValue(pos, value);
}
/* virtual */ void IndustriesScopeResolver::StorePSA(uint pos, int32_t value) {…}
 
static const GRFFile *GetGrffile(IndustryType type)
{
  const IndustrySpec *indspec = GetIndustrySpec(type);
  return (indspec != nullptr) ? indspec->grf_prop.grffile : nullptr;
}
static const GRFFile *GetGrffile(IndustryType type) {…}
 
IndustriesResolverObject::IndustriesResolverObject(TileIndex tile, Industry *indus, IndustryType type, uint32_t random_bits,
    CallbackID callback, uint32_t callback_param1, uint32_t callback_param2)
  : ResolverObject(GetGrffile(type), callback, callback_param1, callback_param2),
  industries_scope(*this, tile, indus, type, random_bits)
{
  this->root_spritegroup = GetIndustrySpec(type)->grf_prop.GetSpriteGroup(indus != nullptr && indus->index != IndustryID::Invalid());
}
IndustriesResolverObject::IndustriesResolverObject(TileIndex tile, Industry *indus, IndustryType type, uint32_t random_bits, {…}
 
TownScopeResolver *IndustriesResolverObject::GetTown()
{
  if (!this->town_scope.has_value()) {
    Town *t = nullptr;
    bool readonly = true;
    if (this->industries_scope.industry != nullptr) {
      t = this->industries_scope.industry->town;
      readonly = this->industries_scope.industry->index == IndustryID::Invalid();
    } else if (this->industries_scope.tile != INVALID_TILE) {
      t = ClosestTownFromTile(this->industries_scope.tile, UINT_MAX);
    }
    if (t == nullptr) return nullptr;
    this->town_scope.emplace(*this, t, readonly);
  }
  return &*this->town_scope;
}
TownScopeResolver *IndustriesResolverObject::GetTown() {…}
 
GrfSpecFeature IndustriesResolverObject::GetFeature() const
{
  return GSF_INDUSTRIES;
}
GrfSpecFeature IndustriesResolverObject::GetFeature() const {…}
 
uint32_t IndustriesResolverObject::GetDebugID() const
{
  return GetIndustrySpec(this->industries_scope.type)->grf_prop.local_id;
}
uint32_t IndustriesResolverObject::GetDebugID() const {…}
 
uint16_t GetIndustryCallback(CallbackID callback, uint32_t param1, uint32_t param2, Industry *industry, IndustryType type, TileIndex tile, std::span<int32_t> regs100)
{
  IndustriesResolverObject object(tile, industry, type, 0, callback, param1, param2);
  return object.ResolveCallback(regs100);
}
uint16_t GetIndustryCallback(CallbackID callback, uint32_t param1, uint32_t param2, Industry *industry, IndustryType type, TileIndex tile, std::span<int32_t> regs100) {…}
 
CommandCost CheckIfCallBackAllowsCreation(TileIndex tile, IndustryType type, size_t layout, uint32_t seed, uint16_t initial_random_bits, Owner founder, IndustryAvailabilityCallType creation_type)
{
  const IndustrySpec *indspec = GetIndustrySpec(type);
 
  Industry ind;
  ind.index = IndustryID::Invalid();
  ind.location.tile = tile;
  ind.location.w = 0; // important to mark the industry invalid
  ind.type = type;
  ind.selected_layout = (uint8_t)layout;
  ind.town = ClosestTownFromTile(tile, UINT_MAX);
  ind.random = initial_random_bits;
  ind.founder = founder;
  ind.psa = nullptr;
 
  IndustriesResolverObject object(tile, &ind, type, seed, CBID_INDUSTRY_LOCATION, 0, creation_type);
  std::array<int32_t, 16> regs100;
  uint16_t result = object.ResolveCallback(regs100);
 
  /* Unlike the "normal" cases, not having a valid result means we allow
   * the building of the industry, as that's how it's done in TTDP. */
  if (result == CALLBACK_FAILED) return CommandCost();
 
  return GetErrorMessageFromLocationCallbackResult(result, regs100, indspec->grf_prop.grffile, STR_ERROR_SITE_UNSUITABLE);
}
CommandCost CheckIfCallBackAllowsCreation(TileIndex tile, IndustryType type, size_t layout, uint32_t seed, uint16_t initial_random_bits, Owner founder, IndustryAvailabilityCallType creation_type) {…}
 
uint32_t GetIndustryProbabilityCallback(IndustryType type, IndustryAvailabilityCallType creation_type, uint32_t default_prob)
{
  const IndustrySpec *indspec = GetIndustrySpec(type);
 
  if (indspec->callback_mask.Test(IndustryCallbackMask::Probability)) {
    uint16_t res = GetIndustryCallback(CBID_INDUSTRY_PROBABILITY, 0, creation_type, nullptr, type, INVALID_TILE);
    if (res != CALLBACK_FAILED) {
      if (indspec->grf_prop.grffile->grf_version < 8) {
        /* Disallow if result != 0 */
        if (res != 0) default_prob = 0;
      } else {
        /* Use returned probability. 0x100 to use default */
        if (res < 0x100) {
          default_prob = res;
        } else if (res > 0x100) {
          ErrorUnknownCallbackResult(indspec->grf_prop.grfid, CBID_INDUSTRY_PROBABILITY, res);
        }
      }
    }
  }
  return default_prob;
}
uint32_t GetIndustryProbabilityCallback(IndustryType type, IndustryAvailabilityCallType creation_type, uint32_t default_prob) {…}
 
void IndustryProductionCallback(Industry *ind, int reason)
{
  const IndustrySpec *spec = GetIndustrySpec(ind->type);
  IndustriesResolverObject object(ind->location.tile, ind, ind->type);
  if (spec->behaviour.Test(IndustryBehaviour::ProdCallbackRandom)) object.callback_param1 = Random();
  int multiplier = 1;
  if (spec->behaviour.Test(IndustryBehaviour::ProdMultiHandling)) multiplier = ind->prod_level;
  object.callback_param2 = reason;
 
  auto deref_ind_prod = [&object](int field, bool use_register) -> int32_t {
    return use_register ? object.GetRegister(field) : field;
  };
 
  for (uint loop = 0;; loop++) {
    /* limit the number of calls to break infinite loops.
     * 'loop' is provided as 16 bits to the newgrf, so abort when those are exceeded. */
    if (loop >= 0x10000) {
      /* display error message */
      ShowErrorMessage(GetEncodedString(STR_NEWGRF_BUGGY, spec->grf_prop.grffile->filename),
        GetEncodedString(STR_NEWGRF_BUGGY_ENDLESS_PRODUCTION_CALLBACK, std::monostate{}, spec->name),
        WL_WARNING);
 
      /* abort the function early, this error isn't critical and will allow the game to continue to run */
      break;
    }
 
    SB(object.callback_param2, 8, 16, loop);
    const auto *group = object.Resolve<IndustryProductionSpriteGroup>();
    if (group == nullptr) break;
 
    if (group->version == 0xFF) {
      /* Result was marked invalid on load, display error message */
      ShowErrorMessage(GetEncodedString(STR_NEWGRF_BUGGY, spec->grf_prop.grffile->filename),
        GetEncodedString(STR_NEWGRF_BUGGY_INVALID_CARGO_PRODUCTION_CALLBACK, std::monostate{}, spec->name, ind->location.tile),
        WL_WARNING);
 
      /* abort the function early, this error isn't critical and will allow the game to continue to run */
      break;
    }
 
    bool deref = (group->version >= 1);
 
    if (group->version < 2) {
      /* Callback parameters map directly to industry cargo slot indices */
      for (uint i = 0; i < group->num_input && i < ind->accepted.size(); i++) {
        if (!IsValidCargoType(ind->accepted[i].cargo)) continue;
        ind->accepted[i].waiting = ClampTo<uint16_t>(ind->accepted[i].waiting - deref_ind_prod(group->subtract_input[i], deref) * multiplier);
      }
      for (uint i = 0; i < group->num_output && i < ind->produced.size(); i++) {
        if (!IsValidCargoType(ind->produced[i].cargo)) continue;
        ind->produced[i].waiting = ClampTo<uint16_t>(ind->produced[i].waiting + std::max(deref_ind_prod(group->add_output[i], deref), 0) * multiplier);
      }
    } else {
      /* Callback receives list of cargos to apply for, which need to have their cargo slots in industry looked up */
      for (uint i = 0; i < group->num_input; i++) {
        auto it = ind->GetCargoAccepted(group->cargo_input[i]);
        if (it == std::end(ind->accepted)) continue;
        it->waiting = ClampTo<uint16_t>(it->waiting - deref_ind_prod(group->subtract_input[i], deref) * multiplier);
      }
      for (uint i = 0; i < group->num_output; i++) {
        auto it = ind->GetCargoProduced(group->cargo_output[i]);
        if (it == std::end(ind->produced)) continue;
        it->waiting = ClampTo<uint16_t>(it->waiting + std::max(deref_ind_prod(group->add_output[i], deref), 0) * multiplier);
      }
    }
 
    int32_t again = deref_ind_prod(group->again, deref);
    if (again == 0) break;
 
    SB(object.callback_param2, 24, 8, again);
  }
 
  SetWindowDirty(WC_INDUSTRY_VIEW, ind->index);
}
void IndustryProductionCallback(Industry *ind, int reason) {…}
 
bool IndustryTemporarilyRefusesCargo(Industry *ind, CargoType cargo_type)
{
  assert(ind->IsCargoAccepted(cargo_type));
 
  const IndustrySpec *indspec = GetIndustrySpec(ind->type);
  if (indspec->callback_mask.Test(IndustryCallbackMask::RefuseCargo)) {
    uint16_t res = GetIndustryCallback(CBID_INDUSTRY_REFUSE_CARGO,
        0, indspec->grf_prop.grffile->cargo_map[cargo_type],
        ind, ind->type, ind->location.tile);
    if (res != CALLBACK_FAILED) return !ConvertBooleanCallback(indspec->grf_prop.grffile, CBID_INDUSTRY_REFUSE_CARGO, res);
  }
  return false;
}
bool IndustryTemporarilyRefusesCargo(Industry *ind, CargoType cargo_type) {…}