newgrf_actd.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 <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */

 
#include "../stdafx.h"
#include "../debug.h"
#include "../newgrf.h"
#include "../newgrf_engine.h"
#include "../newgrf_cargo.h"
#include "../timer/timer_game_calendar.h"
#include "../error.h"
#include "../engine_func.h"
#include "../vehicle_base.h"
#include "../rail.h"
#include "../road.h"
#include "newgrf_bytereader.h"
#include "newgrf_internal.h"
 
#include "table/strings.h"
 
#include "../safeguards.h"

static std::array<GrfID, 256> _grm_engines{};

static std::array<GrfID, NUM_CARGO * 2> _grm_cargoes{};
 
void ResetGRM()
{
  _grm_engines.fill({});
  _grm_cargoes.fill({});
}
 
/* Action 0x0D (GrfLoadingStage::SafetyScan) */
static void SafeParamSet(ByteReader &buf)
{
  uint8_t target = buf.ReadByte();
 
  /* Writing GRF parameters and some bits of 'misc GRF features' are safe. */
  if (target < 0x80 || target == 0x9E) return;
 
  /* GRM could be unsafe, but as here it can only happen after other GRFs
   * are loaded, it should be okay. If the GRF tried to use the slots it
   * reserved, it would be marked unsafe anyway. GRM for (e.g. bridge)
   * sprites  is considered safe. */
  GRFUnsafe(buf);
}
 
static uint32_t GetPatchVariable(uint8_t param)
{
  switch (param) {
    /* start year - 1920 */
    case 0x0B: return (std::max(_settings_game.game_creation.starting_year, CalendarTime::ORIGINAL_BASE_YEAR) - CalendarTime::ORIGINAL_BASE_YEAR).base();
 
    /* freight trains weight factor */
    case 0x0E: return _settings_game.vehicle.freight_trains;
 
    /* empty wagon speed increase */
    case 0x0F: return 0;
 
    /* plane speed factor; our patch option is reversed from TTDPatch's,
     * the following is good for 1x, 2x and 4x (most common?) and...
     * well not really for 3x. */
    case 0x10:
      switch (_settings_game.vehicle.plane_speed) {
        default:
        case 4: return 1;
        case 3: return 2;
        case 2: return 2;
        case 1: return 4;
      }
 
 
    /* 2CC colourmap base sprite */
    case 0x11: return SPR_2CCMAP_BASE;
 
    /* map size: format = -MABXYSS
     * M  : the type of map
     *       bit 0 : set   : squared map. Bit 1 is now not relevant
     *               clear : rectangle map. Bit 1 will indicate the bigger edge of the map
     *       bit 1 : set   : Y is the bigger edge. Bit 0 is clear
     *               clear : X is the bigger edge.
     * A  : minimum edge(log2) of the map
     * B  : maximum edge(log2) of the map
     * XY : edges(log2) of each side of the map.
     * SS : combination of both X and Y, thus giving the size(log2) of the map
     */
    case 0x13: {
      uint8_t map_bits = 0;
      uint8_t log_X = Map::LogX() - 6; // subtraction is required to make the minimal size (64) zero based
      uint8_t log_Y = Map::LogY() - 6;
      uint8_t max_edge = std::max(log_X, log_Y);
 
      if (log_X == log_Y) { // we have a squared map, since both edges are identical
        SetBit(map_bits, 0);
      } else {
        if (max_edge == log_Y) SetBit(map_bits, 1); // edge Y been the biggest, mark it
      }
 
      return (map_bits << 24) | (std::min(log_X, log_Y) << 20) | (max_edge << 16) |
        (log_X << 12) | (log_Y << 8) | (log_X + log_Y);
    }
 
    /* The maximum height of the map. */
    case 0x14:
      return _settings_game.construction.map_height_limit;
 
    /* Extra foundations base sprite */
    case 0x15:
      return SPR_SLOPES_BASE;
 
    /* Shore base sprite */
    case 0x16:
      return SPR_SHORE_BASE;
 
    /* Game map seed */
    case 0x17:
      return _settings_game.game_creation.generation_seed;
 
    default:
      GrfMsg(2, "ParamSet: Unknown Patch variable 0x{:02X}.", param);
      return 0;
  }
}

static uint32_t PerformGRM(std::span<GrfID> grm, uint16_t count, uint8_t op, uint8_t target, std::string_view type)
{
  uint start = 0;
  uint size  = 0;
 
  if (op == 6) {
    /* Return GRFID of set that reserved ID */
    uint32_t index = _cur_gps.grffile->GetParam(target);
    if (index < std::size(grm)) return FlattenNewGRFLabel(grm[index]);
 
    GrfMsg(1, "ParamSet: GRM: Parameter {} refers to invalid {} id {}", target, type, index);
    return 0;
  }
 
  /* With an operation of 2 or 3, we want to reserve a specific block of IDs */
  if (op == 2 || op == 3) start = _cur_gps.grffile->GetParam(target);
 
  for (uint i = start; i < std::size(grm); i++) {
    if (grm[i].Empty()) {
      size++;
    } else {
      if (op == 2 || op == 3) break;
      start = i + 1;
      size = 0;
    }
 
    if (size == count) break;
  }
 
  if (size == count) {
    /* Got the slot... */
    if (op == 0 || op == 3) {
      GrfMsg(2, "ParamSet: GRM: Reserving {} {} at {}", count, type, start);
      for (uint i = 0; i < count; i++) grm[start + i] = _cur_gps.grffile->grfid;
    }
    return start;
  }
 
  /* Unable to allocate */
  if (op != 4 && op != 5) {
    /* Deactivate GRF */
    GrfMsg(0, "ParamSet: GRM: Unable to allocate {} {}, deactivating", count, type);
    DisableGrf(STR_NEWGRF_ERROR_GRM_FAILED);
    return UINT_MAX;
  }
 
  GrfMsg(1, "ParamSet: GRM: Unable to allocate {} {}", count, type);
  return UINT_MAX;
}

static void ParamSet(ByteReader &buf)
{
  /* <0D> <target> <operation> <source1> <source2> [<data>]
   *
   * B target        parameter number where result is stored
   * B operation     operation to perform, see below
   * B source1       first source operand
   * B source2       second source operand
   * D data          data to use in the calculation, not necessary
   *                 if both source1 and source2 refer to actual parameters
   *
   * Operations
   * 00      Set parameter equal to source1
   * 01      Addition, source1 + source2
   * 02      Subtraction, source1 - source2
   * 03      Unsigned multiplication, source1 * source2 (both unsigned)
   * 04      Signed multiplication, source1 * source2 (both signed)
   * 05      Unsigned bit shift, source1 by source2 (source2 taken to be a
   *         signed quantity; left shift if positive and right shift if
   *         negative, source1 is unsigned)
   * 06      Signed bit shift, source1 by source2
   *         (source2 like in 05, and source1 as well)
   */
 
  uint8_t target = buf.ReadByte();
  uint8_t oper   = buf.ReadByte();
  uint32_t src1  = buf.ReadByte();
  uint32_t src2  = buf.ReadByte();
 
  uint32_t data = 0;
  if (buf.Remaining() >= 4) data = buf.ReadDWord();
 
  /* You can add 80 to the operation to make it apply only if the target
   * is not defined yet.  In this respect, a parameter is taken to be
   * defined if any of the following applies:
   * - it has been set to any value in the newgrf(w).cfg parameter list
   * - it OR A PARAMETER WITH HIGHER NUMBER has been set to any value by
   *   an earlier action D */
  if (HasBit(oper, 7)) {
    if (target < 0x80 && target < std::size(_cur_gps.grffile->param)) {
      GrfMsg(7, "ParamSet: Param {} already defined, skipping", target);
      return;
    }
 
    oper = GB(oper, 0, 7);
  }
 
  if (src2 == 0xFE) {
    if (GB(data, 0, 8) == 0xFF) {
      if (data == 0x0000FFFF) {
        /* Patch variables */
        src1 = GetPatchVariable(src1);
      } else {
        /* GRF Resource Management */
        uint8_t  op      = src1;
        GrfSpecFeature feature{static_cast<uint8_t>(GB(data, 8, 8))};
        uint16_t count   = GB(data, 16, 16);
 
        if (_cur_gps.stage == GrfLoadingStage::Reserve) {
          if (feature == GrfSpecFeature::GlobalVar) {
            /* General sprites */
            if (op == 0) {
              /* Check if the allocated sprites will fit below the original sprite limit */
              if (_cur_gps.spriteid + count >= 16384) {
                GrfMsg(0, "ParamSet: GRM: Unable to allocate {} sprites; try changing NewGRF order", count);
                DisableGrf(STR_NEWGRF_ERROR_GRM_FAILED);
                return;
              }
 
              /* Reserve space at the current sprite ID */
              GrfMsg(4, "ParamSet: GRM: Allocated {} sprites at {}", count, _cur_gps.spriteid);
              _grm_sprites[GRFLocation{_cur_gps.grffile->grfid, _cur_gps.nfo_line}] = std::make_pair(_cur_gps.spriteid, count);
              _cur_gps.spriteid += count;
            }
          }
          /* Ignore GRM result during reservation */
          src1 = 0;
        } else if (_cur_gps.stage == GrfLoadingStage::Activation) {
          switch (feature) {
            case GrfSpecFeature::Trains:
            case GrfSpecFeature::RoadVehicles:
            case GrfSpecFeature::Ships:
            case GrfSpecFeature::Aircraft:
              if (!_settings_game.vehicle.dynamic_engines) {
                src1 = PerformGRM({std::begin(_grm_engines) + GetOriginalEngineOffset(GetVehicleType(feature)), GetOriginalEngineCount(GetVehicleType(feature))}, count, op, target, "vehicles");
                if (_cur_gps.skip_sprites == -1) return;
              } else {
                /* GRM does not apply for dynamic engine allocation. */
                switch (op) {
                  case 2:
                  case 3:
                    src1 = _cur_gps.grffile->GetParam(target);
                    break;
 
                  default:
                    src1 = 0;
                    break;
                }
              }
              break;
 
            case GrfSpecFeature::GlobalVar: // General sprites
              switch (op) {
                case 0:
                  /* Return space reserved during reservation stage */
                  src1 = _grm_sprites[GRFLocation{_cur_gps.grffile->grfid, _cur_gps.nfo_line}].first;
                  GrfMsg(4, "ParamSet: GRM: Using pre-allocated sprites at {}", src1);
                  break;
 
                case 1:
                  src1 = _cur_gps.spriteid;
                  break;
 
                default:
                  GrfMsg(1, "ParamSet: GRM: Unsupported operation {} for general sprites", op);
                  return;
              }
              break;
 
            case GrfSpecFeature::Cargoes: // Cargo
              /* There are two ranges: one for cargo IDs and one for cargo bitmasks */
              src1 = PerformGRM(_grm_cargoes, count, op, target, "cargoes");
              if (_cur_gps.skip_sprites == -1) return;
              break;
 
            default: GrfMsg(1, "ParamSet: GRM: Unsupported feature 0x{:X}", feature); return;
          }
        } else {
          /* Ignore GRM during initialization */
          src1 = 0;
        }
      }
    } else {
      /* Read another GRF File's parameter */
      GrfID grfid = UnflattenNewGRFLabel<GrfID>(data);
      const GRFFile *file = GetFileByGRFID(grfid);
      GRFConfig *c = GetGRFConfig(grfid);
      if (c != nullptr && c->flags.Test(GRFConfigFlag::Static) && !_cur_gps.grfconfig->flags.Test(GRFConfigFlag::Static) && _networking) {
        /* Disable the read GRF if it is a static NewGRF. */
        DisableStaticNewGRFInfluencingNonStaticNewGRFs(*c);
        src1 = 0;
      } else if (file == nullptr || c == nullptr || c->status == GRFStatus::Disabled) {
        src1 = 0;
      } else if (src1 == 0xFE) {
        src1 = c->version;
      } else {
        src1 = file->GetParam(src1);
      }
    }
  } else {
    /* The source1 and source2 operands refer to the grf parameter number
     * like in action 6 and 7.  In addition, they can refer to the special
     * variables available in action 7, or they can be FF to use the value
     * of <data>.  If referring to parameters that are undefined, a value
     * of 0 is used instead.  */
    src1 = (src1 == 0xFF) ? data : GetParamVal(src1, nullptr);
    src2 = (src2 == 0xFF) ? data : GetParamVal(src2, nullptr);
  }
 
  uint32_t res;
  switch (oper) {
    case 0x00:
      res = src1;
      break;
 
    case 0x01:
      res = src1 + src2;
      break;
 
    case 0x02:
      res = src1 - src2;
      break;
 
    case 0x03:
      res = src1 * src2;
      break;
 
    case 0x04:
      res = (int32_t)src1 * (int32_t)src2;
      break;
 
    case 0x05:
      if ((int32_t)src2 < 0) {
        res = src1 >> -(int32_t)src2;
      } else {
        res = src1 << (src2 & 0x1F); // Same behaviour as in EvalAdjustT, mask 'value' to 5 bits, which should behave the same on all architectures.
      }
      break;
 
    case 0x06:
      if ((int32_t)src2 < 0) {
        res = (int32_t)src1 >> -(int32_t)src2;
      } else {
        res = (int32_t)src1 << (src2 & 0x1F); // Same behaviour as in EvalAdjustT, mask 'value' to 5 bits, which should behave the same on all architectures.
      }
      break;
 
    case 0x07: // Bitwise AND
      res = src1 & src2;
      break;
 
    case 0x08: // Bitwise OR
      res = src1 | src2;
      break;
 
    case 0x09: // Unsigned division
      if (src2 == 0) {
        res = src1;
      } else {
        res = src1 / src2;
      }
      break;
 
    case 0x0A: // Signed division
      if (src2 == 0) {
        res = src1;
      } else {
        res = (int32_t)src1 / (int32_t)src2;
      }
      break;
 
    case 0x0B: // Unsigned modulo
      if (src2 == 0) {
        res = src1;
      } else {
        res = src1 % src2;
      }
      break;
 
    case 0x0C: // Signed modulo
      if (src2 == 0) {
        res = src1;
      } else {
        res = (int32_t)src1 % (int32_t)src2;
      }
      break;
 
    default: GrfMsg(0, "ParamSet: Unknown operation {}, skipping", oper); return;
  }
 
  switch (target) {
    case 0x8E: // Y-Offset for train sprites
      _cur_gps.grffile->traininfo_vehicle_pitch = res;
      break;
 
    case 0x8F: { // Rail track type cost factors
      extern RailTypeInfo _railtypes[RAILTYPE_END];
      _railtypes[RAILTYPE_RAIL].cost_multiplier = GB(res, 0, 8);
      if (_settings_game.vehicle.disable_elrails) {
        _railtypes[RAILTYPE_ELECTRIC].cost_multiplier = GB(res, 0, 8);
        _railtypes[RAILTYPE_MONO].cost_multiplier = GB(res, 8, 8);
      } else {
        _railtypes[RAILTYPE_ELECTRIC].cost_multiplier = GB(res, 8, 8);
        _railtypes[RAILTYPE_MONO].cost_multiplier = GB(res, 16, 8);
      }
      _railtypes[RAILTYPE_MAGLEV].cost_multiplier = GB(res, 16, 8);
      break;
    }
 
    /* not implemented */
    case 0x93: // Tile refresh offset to left -- Intended to allow support for larger sprites, not necessary for OTTD
    case 0x94: // Tile refresh offset to right
    case 0x95: // Tile refresh offset upwards
    case 0x96: // Tile refresh offset downwards
    case 0x97: // Snow line height -- Better supported by feature 8 property 10h (snow line table) TODO: implement by filling the entire snow line table with the given value
    case 0x99: // Global ID offset -- Not necessary since IDs are remapped automatically
      GrfMsg(7, "ParamSet: Skipping unimplemented target 0x{:02X}", target);
      break;
 
    case 0x9E: { // Miscellaneous GRF features
      GrfMiscBits bits(res);
 
      /* Set train list engine width */
      _cur_gps.grffile->traininfo_vehicle_width = bits.Test(GrfMiscBit::TrainWidth32Pixels) ? VEHICLEINFO_FULL_VEHICLE_WIDTH : TRAININFO_DEFAULT_VEHICLE_WIDTH;
      /* Remove the local flags from the global flags */
      bits.Reset(GrfMiscBit::TrainWidth32Pixels);
 
      /* Only copy safe bits for static grfs */
      if (_cur_gps.grfconfig->flags.Test(GRFConfigFlag::Static)) {
        GrfMiscBits safe_bits = GrfMiscBit::SecondRockyTileSet;
 
        _misc_grf_features.Reset(safe_bits);
        _misc_grf_features.Set(bits & safe_bits);
      } else {
        _misc_grf_features = bits;
      }
      break;
    }
 
    case 0x9F: // locale-dependent settings
      GrfMsg(7, "ParamSet: Skipping unimplemented target 0x{:02X}", target);
      break;
 
    default:
      if (target < 0x80) {
        /* Resize (and fill with zeroes) if needed. */
        if (target >= std::size(_cur_gps.grffile->param)) _cur_gps.grffile->param.resize(target + 1);
        _cur_gps.grffile->param[target] = res;
      } else {
        GrfMsg(7, "ParamSet: Skipping unknown target 0x{:02X}", target);
      }
      break;
  }
}

template <> void GrfActionHandler<0x0D>::FileScan(ByteReader &) { }
template <> void GrfActionHandler<0x0D>::SafetyScan(ByteReader &buf) { SafeParamSet(buf); }
template <> void GrfActionHandler<0x0D>::LabelScan(ByteReader &) { }
template <> void GrfActionHandler<0x0D>::Init(ByteReader &buf) { ParamSet(buf); }
template <> void GrfActionHandler<0x0D>::Reserve(ByteReader &buf) { ParamSet(buf); }
template <> void GrfActionHandler<0x0D>::Activation(ByteReader &buf) { ParamSet(buf); }