newgrf_act0_trains.cpp

Go to the documentation of this file.

/*
 * 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 "../newgrf_cargo.h"
#include "../newgrf_engine.h"
#include "../vehicle_base.h"
#include "newgrf_bytereader.h"
#include "newgrf_internal_vehicle.h"
#include "newgrf_internal.h"
 
#include "../safeguards.h"
 
ChangeInfoResult RailVehicleChangeInfo(uint first, uint last, int prop, ByteReader &buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  for (uint id = first; id < last; ++id) {
    Engine *e = GetNewEngine(_cur.grffile, VEH_TRAIN, id);
    if (e == nullptr) return CIR_INVALID_ID; // No engine could be allocated, so neither can any next vehicles
 
    EngineInfo *ei = &e->info;
    RailVehicleInfo *rvi = &e->u.rail;
 
    switch (prop) {
      case 0x05: { // Track type
        uint8_t tracktype = buf.ReadByte();
 
        if (tracktype < _cur.grffile->railtype_list.size()) {
          _gted[e->index].railtypelabel = _cur.grffile->railtype_list[tracktype];
          break;
        }
 
        switch (tracktype) {
          case 0: _gted[e->index].railtypelabel = rvi->engclass >= 2 ? RAILTYPE_LABEL_ELECTRIC : RAILTYPE_LABEL_RAIL; break;
          case 1: _gted[e->index].railtypelabel = RAILTYPE_LABEL_MONO; break;
          case 2: _gted[e->index].railtypelabel = RAILTYPE_LABEL_MAGLEV; break;
          default:
            GrfMsg(1, "RailVehicleChangeInfo: Invalid track type {} specified, ignoring", tracktype);
            break;
        }
        break;
      }
 
      case 0x08: // AI passenger service
        /* Tells the AI that this engine is designed for
         * passenger services and shouldn't be used for freight. */
        rvi->ai_passenger_only = buf.ReadByte();
        break;
 
      case PROP_TRAIN_SPEED: { // 0x09 Speed (1 unit is 1 km-ish/h)
        uint16_t speed = buf.ReadWord();
        if (speed == 0xFFFF) speed = 0;
 
        rvi->max_speed = speed;
        break;
      }
 
      case PROP_TRAIN_POWER: // 0x0B Power
        rvi->power = buf.ReadWord();
 
        /* Set engine / wagon state based on power */
        if (rvi->power != 0) {
          if (rvi->railveh_type == RAILVEH_WAGON) {
            rvi->railveh_type = RAILVEH_SINGLEHEAD;
          }
        } else {
          rvi->railveh_type = RAILVEH_WAGON;
        }
        break;
 
      case PROP_TRAIN_RUNNING_COST_FACTOR: // 0x0D Running cost factor
        rvi->running_cost = buf.ReadByte();
        break;
 
      case 0x0E: // Running cost base
        ConvertTTDBasePrice(buf.ReadDWord(), "RailVehicleChangeInfo", &rvi->running_cost_class);
        break;
 
      case 0x12: { // Sprite ID
        uint8_t spriteid = buf.ReadByte();
        uint8_t orig_spriteid = spriteid;
 
        /* TTD sprite IDs point to a location in a 16bit array, but we use it
         * as an array index, so we need it to be half the original value. */
        if (spriteid < 0xFD) spriteid >>= 1;
 
        if (IsValidNewGRFImageIndex<VEH_TRAIN>(spriteid)) {
          rvi->image_index = spriteid;
        } else {
          GrfMsg(1, "RailVehicleChangeInfo: Invalid Sprite {} specified, ignoring", orig_spriteid);
          rvi->image_index = 0;
        }
        break;
      }
 
      case 0x13: { // Dual-headed
        uint8_t dual = buf.ReadByte();
 
        if (dual != 0) {
          rvi->railveh_type = RAILVEH_MULTIHEAD;
        } else {
          rvi->railveh_type = rvi->power == 0 ?
            RAILVEH_WAGON : RAILVEH_SINGLEHEAD;
        }
        break;
      }
 
      case PROP_TRAIN_CARGO_CAPACITY: // 0x14 Cargo capacity
        rvi->capacity = buf.ReadByte();
        break;
 
      case 0x15: { // Cargo type
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        uint8_t ctype = buf.ReadByte();
 
        if (ctype == 0xFF) {
          /* 0xFF is specified as 'use first refittable' */
          ei->cargo_type = INVALID_CARGO;
        } else {
          /* Use translated cargo. Might result in INVALID_CARGO (first refittable), if cargo is not defined. */
          ei->cargo_type = GetCargoTranslation(ctype, _cur.grffile);
          if (ei->cargo_type == INVALID_CARGO) GrfMsg(2, "RailVehicleChangeInfo: Invalid cargo type {}, using first refittable", ctype);
        }
        ei->cargo_label = CT_INVALID;
        break;
      }
 
      case PROP_TRAIN_WEIGHT: // 0x16 Weight
        SB(rvi->weight, 0, 8, buf.ReadByte());
        break;
 
      case PROP_TRAIN_COST_FACTOR: // 0x17 Cost factor
        rvi->cost_factor = buf.ReadByte();
        break;
 
      case 0x18: // AI rank
        GrfMsg(2, "RailVehicleChangeInfo: Property 0x18 'AI rank' not used by NoAI, ignored.");
        buf.ReadByte();
        break;
 
      case 0x19: { // Engine traction type
        /* What do the individual numbers mean?
         * 0x00 .. 0x07: Steam
         * 0x08 .. 0x27: Diesel
         * 0x28 .. 0x31: Electric
         * 0x32 .. 0x37: Monorail
         * 0x38 .. 0x41: Maglev
         */
        uint8_t traction = buf.ReadByte();
        EngineClass engclass;
 
        if (traction <= 0x07) {
          engclass = EC_STEAM;
        } else if (traction <= 0x27) {
          engclass = EC_DIESEL;
        } else if (traction <= 0x31) {
          engclass = EC_ELECTRIC;
        } else if (traction <= 0x37) {
          engclass = EC_MONORAIL;
        } else if (traction <= 0x41) {
          engclass = EC_MAGLEV;
        } else {
          break;
        }
 
        if (_cur.grffile->railtype_list.empty()) {
          /* Use traction type to select between normal and electrified
           * rail only when no translation list is in place. */
          if (_gted[e->index].railtypelabel == RAILTYPE_LABEL_RAIL     && engclass >= EC_ELECTRIC) _gted[e->index].railtypelabel = RAILTYPE_LABEL_ELECTRIC;
          if (_gted[e->index].railtypelabel == RAILTYPE_LABEL_ELECTRIC && engclass  < EC_ELECTRIC) _gted[e->index].railtypelabel = RAILTYPE_LABEL_RAIL;
        }
 
        rvi->engclass = engclass;
        break;
      }
 
      case 0x1A: // Alter purchase list sort order
        AlterVehicleListOrder(e->index, buf.ReadExtendedByte());
        break;
 
      case 0x1B: // Powered wagons power bonus
        rvi->pow_wag_power = buf.ReadWord();
        break;
 
      case 0x1C: // Refit cost
        ei->refit_cost = buf.ReadByte();
        break;
 
      case 0x1D: { // Refit cargo
        uint32_t mask = buf.ReadDWord();
        _gted[e->index].UpdateRefittability(mask != 0);
        ei->refit_mask = TranslateRefitMask(mask);
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        break;
      }
 
      case 0x1E: { // Callback
        auto mask = ei->callback_mask.base();
        SB(mask, 0, 8, buf.ReadByte());
        ei->callback_mask = VehicleCallbackMasks{mask};
        break;
      }
 
      case PROP_TRAIN_TRACTIVE_EFFORT: // 0x1F Tractive effort coefficient
        rvi->tractive_effort = buf.ReadByte();
        break;
 
      case 0x20: // Air drag
        rvi->air_drag = buf.ReadByte();
        break;
 
      case PROP_TRAIN_SHORTEN_FACTOR: // 0x21 Shorter vehicle
        rvi->shorten_factor = buf.ReadByte();
        break;
 
      case 0x22: // Visual effect
        rvi->visual_effect = buf.ReadByte();
        /* Avoid accidentally setting visual_effect to the default value
         * Since bit 6 (disable effects) is set anyways, we can safely erase some bits. */
        if (rvi->visual_effect == VE_DEFAULT) {
          assert(HasBit(rvi->visual_effect, VE_DISABLE_EFFECT));
          SB(rvi->visual_effect, VE_TYPE_START, VE_TYPE_COUNT, 0);
        }
        break;
 
      case 0x23: // Powered wagons weight bonus
        rvi->pow_wag_weight = buf.ReadByte();
        break;
 
      case 0x24: { // High byte of vehicle weight
        uint8_t weight = buf.ReadByte();
 
        if (weight > 4) {
          GrfMsg(2, "RailVehicleChangeInfo: Nonsensical weight of {} tons, ignoring", weight << 8);
        } else {
          SB(rvi->weight, 8, 8, weight);
        }
        break;
      }
 
      case PROP_TRAIN_USER_DATA: // 0x25 User-defined bit mask to set when checking veh. var. 42
        rvi->user_def_data = buf.ReadByte();
        break;
 
      case 0x26: // Retire vehicle early
        ei->retire_early = buf.ReadByte();
        break;
 
      case 0x27: // Miscellaneous flags
        ei->misc_flags = static_cast<EngineMiscFlags>(buf.ReadByte());
        _loaded_newgrf_features.has_2CC |= ei->misc_flags.Test(EngineMiscFlag::Uses2CC);
        break;
 
      case 0x28: // Cargo classes allowed
        _gted[e->index].cargo_allowed = CargoClasses{buf.ReadWord()};
        _gted[e->index].UpdateRefittability(_gted[e->index].cargo_allowed.Any());
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        break;
 
      case 0x29: // Cargo classes disallowed
        _gted[e->index].cargo_disallowed = CargoClasses{buf.ReadWord()};
        _gted[e->index].UpdateRefittability(false);
        break;
 
      case 0x2A: // Long format introduction date (days since year 0)
        ei->base_intro = TimerGameCalendar::Date(buf.ReadDWord());
        break;
 
      case PROP_TRAIN_CARGO_AGE_PERIOD: // 0x2B Cargo aging period
        ei->cargo_age_period = buf.ReadWord();
        break;
 
      case 0x2C:   // CTT refit include list
      case 0x2D: { // CTT refit exclude list
        uint8_t count = buf.ReadByte();
        _gted[e->index].UpdateRefittability(prop == 0x2C && count != 0);
        if (prop == 0x2C) _gted[e->index].defaultcargo_grf = _cur.grffile;
        CargoTypes &ctt = prop == 0x2C ? _gted[e->index].ctt_include_mask : _gted[e->index].ctt_exclude_mask;
        ctt = 0;
        while (count--) {
          CargoType ctype = GetCargoTranslation(buf.ReadByte(), _cur.grffile);
          if (IsValidCargoType(ctype)) SetBit(ctt, ctype);
        }
        break;
      }
 
      case PROP_TRAIN_CURVE_SPEED_MOD: // 0x2E Curve speed modifier
        rvi->curve_speed_mod = buf.ReadWord();
        break;
 
      case 0x2F: // Engine variant
        ei->variant_id = static_cast<EngineID>(buf.ReadWord());
        break;
 
      case 0x30: // Extra miscellaneous flags
        ei->extra_flags = static_cast<ExtraEngineFlags>(buf.ReadDWord());
        break;
 
      case 0x31: { // Callback additional mask
        auto mask = ei->callback_mask.base();
        SB(mask, 8, 8, buf.ReadByte());
        ei->callback_mask = VehicleCallbackMasks{mask};
        break;
      }
 
      case 0x32: // Cargo classes required for a refit.
        _gted[e->index].cargo_allowed_required = CargoClasses{buf.ReadWord()};
        break;
 
      case 0x33: // Badge list
        e->badges = ReadBadgeList(buf, GSF_TRAINS);
        break;
 
      default:
        ret = CommonVehicleChangeInfo(ei, prop, buf);
        break;
    }
  }
 
  return ret;
}
 
template <> ChangeInfoResult GrfChangeInfoHandler<GSF_TRAINS>::Reserve(uint, uint, int, ByteReader &) { return CIR_UNHANDLED; }
template <> ChangeInfoResult GrfChangeInfoHandler<GSF_TRAINS>::Activation(uint first, uint last, int prop, ByteReader &buf) { return RailVehicleChangeInfo(first, last, prop, buf); }