newgrf_airporttiles.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 "newgrf_airporttiles.h"
#include "newgrf_spritegroup.h"
#include "newgrf_sound.h"
#include "station_base.h"
#include "water.h"
#include "landscape.h"
#include "company_base.h"
#include "town.h"
#include "table/strings.h"
#include "table/airporttiles.h"
#include "newgrf_animation_base.h"
 
#include "safeguards.h"
 
extern uint32_t GetRelativePosition(TileIndex tile, TileIndex ind_tile);
 
AirportTileSpec AirportTileSpec::tiles[NUM_AIRPORTTILES];
 
AirportTileOverrideManager _airporttile_mngr(NEW_AIRPORTTILE_OFFSET, NUM_AIRPORTTILES, INVALID_AIRPORTTILE);
 
/* static */ const AirportTileSpec *AirportTileSpec::Get(StationGfx gfx)
{
  /* should be assert(gfx < lengthof(tiles)), but that gives compiler warnings
   * since it's always true if the following holds: */
  static_assert(MAX_UVALUE(StationGfx) + 1 == lengthof(tiles));
  return &AirportTileSpec::tiles[gfx];
}
 
/* static */ const AirportTileSpec *AirportTileSpec::GetByTile(TileIndex tile)
{
  return AirportTileSpec::Get(GetAirportGfx(tile));
}
 
void AirportTileSpec::ResetAirportTiles()
{
  auto insert = std::copy(std::begin(_origin_airporttile_specs), std::end(_origin_airporttile_specs), std::begin(AirportTileSpec::tiles));
  std::fill(insert, std::end(AirportTileSpec::tiles), AirportTileSpec{});
 
  /* Reset any overrides that have been set. */
  _airporttile_mngr.ResetOverride();
}
 
void AirportTileOverrideManager::SetEntitySpec(const AirportTileSpec *airpts)
{
  StationGfx airpt_id = this->AddEntityID(airpts->grf_prop.local_id, airpts->grf_prop.grffile->grfid, airpts->grf_prop.subst_id);
 
  if (airpt_id == this->invalid_id) {
    GrfMsg(1, "AirportTile.SetEntitySpec: Too many airport tiles allocated. Ignoring.");
    return;
  }
 
  AirportTileSpec::tiles[airpt_id] = *airpts;
 
  /* Now add the overrides. */
  for (int i = 0; i < this->max_offset; i++) {
    AirportTileSpec *overridden_airpts = &AirportTileSpec::tiles[i];
 
    if (this->entity_overrides[i] != airpts->grf_prop.local_id || this->grfid_overrides[i] != airpts->grf_prop.grffile->grfid) continue;
 
    overridden_airpts->grf_prop.override = airpt_id;
    overridden_airpts->enabled = false;
    this->entity_overrides[i] = this->invalid_id;
    this->grfid_overrides[i] = 0;
  }
}
 
StationGfx GetTranslatedAirportTileID(StationGfx gfx)
{
  const AirportTileSpec *it = AirportTileSpec::Get(gfx);
  return it->grf_prop.override == INVALID_AIRPORTTILE ? gfx : it->grf_prop.override;
}
 
static uint32_t GetNearbyAirportTileInformation(byte parameter, TileIndex tile, StationID index, bool grf_version8)
{
  if (parameter != 0) tile = GetNearbyTile(parameter, tile); // only perform if it is required
  bool is_same_airport = (IsTileType(tile, MP_STATION) && IsAirport(tile) && GetStationIndex(tile) == index);
 
  return GetNearbyTileInformation(tile, grf_version8) | (is_same_airport ? 1 : 0) << 8;
}
 
 
static uint32_t GetAirportTileIDAtOffset(TileIndex tile, const Station *st, uint32_t cur_grfid)
{
  if (!st->TileBelongsToAirport(tile)) {
    return 0xFFFF;
  }
 
  StationGfx gfx = GetAirportGfx(tile);
  const AirportTileSpec *ats = AirportTileSpec::Get(gfx);
 
  if (gfx < NEW_AIRPORTTILE_OFFSET) { // Does it belongs to an old type?
    /* It is an old tile.  We have to see if it's been overridden */
    if (ats->grf_prop.override == INVALID_AIRPORTTILE) { // has it been overridden?
      return 0xFF << 8 | gfx; // no. Tag FF + the gfx id of that tile
    }
    /* Overridden */
    const AirportTileSpec *tile_ovr = AirportTileSpec::Get(ats->grf_prop.override);
 
    if (tile_ovr->grf_prop.grffile->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 (ats->grf_prop.spritegroup[0] != nullptr) { // tile has a spritegroup ?
    if (ats->grf_prop.grffile->grfid == cur_grfid) { // same airport, same grf ?
      return ats->grf_prop.local_id;
    } else {
      return 0xFFFE; // Defined in another grf file
    }
  }
  /* The tile has no spritegroup */
  return 0xFF << 8 | ats->grf_prop.subst_id; // so just give it the substitute
}
 
/* virtual */ uint32_t AirportTileScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
{
  assert(this->st != nullptr);
 
  switch (variable) {
    /* Terrain type */
    case 0x41: return GetTerrainType(this->tile);
 
    /* Current town zone of the tile in the nearest town */
    case 0x42: return GetTownRadiusGroup(ClosestTownFromTile(this->tile, UINT_MAX), this->tile);
 
    /* Position relative to most northern airport tile. */
    case 0x43: return GetRelativePosition(this->tile, this->st->airport.tile);
 
    /* Animation frame of tile */
    case 0x44: return GetAnimationFrame(this->tile);
 
    /* Land info of nearby tiles */
    case 0x60: return GetNearbyAirportTileInformation(parameter, this->tile, this->st->index, this->ro.grffile->grf_version >= 8);
 
    /* Animation stage of nearby tiles */
    case 0x61: {
      TileIndex tile = GetNearbyTile(parameter, this->tile);
      if (this->st->TileBelongsToAirport(tile)) {
        return GetAnimationFrame(tile);
      }
      return UINT_MAX;
    }
 
    /* Get airport tile ID at offset */
    case 0x62: return GetAirportTileIDAtOffset(GetNearbyTile(parameter, this->tile), this->st, this->ro.grffile->grfid);
  }
 
  Debug(grf, 1, "Unhandled airport tile variable 0x{:X}", variable);
 
  *available = false;
  return UINT_MAX;
}
 
/* virtual */ uint32_t AirportTileScopeResolver::GetRandomBits() const
{
  return (this->st == nullptr ? 0 : this->st->random_bits) | (this->tile == INVALID_TILE ? 0 : GetStationTileRandomBits(this->tile) << 16);
}
 
AirportTileResolverObject::AirportTileResolverObject(const AirportTileSpec *ats, TileIndex tile, Station *st,
    CallbackID callback, uint32_t callback_param1, uint32_t callback_param2)
  : ResolverObject(ats->grf_prop.grffile, callback, callback_param1, callback_param2),
    tiles_scope(*this, ats, tile, st),
    airport_scope(*this, tile, st, st != nullptr ? st->airport.type : (byte)AT_DUMMY, st != nullptr ? st->airport.layout : 0)
{
  this->root_spritegroup = ats->grf_prop.spritegroup[0];
}
 
GrfSpecFeature AirportTileResolverObject::GetFeature() const
{
  return GSF_AIRPORTTILES;
}
 
uint32_t AirportTileResolverObject::GetDebugID() const
{
  return this->tiles_scope.ats->grf_prop.local_id;
}
 
uint16_t GetAirportTileCallback(CallbackID callback, uint32_t param1, uint32_t param2, const AirportTileSpec *ats, Station *st, TileIndex tile, [[maybe_unused]] int extra_data = 0)
{
  AirportTileResolverObject object(ats, tile, st, callback, param1, param2);
  return object.ResolveCallback();
}
 
static void AirportDrawTileLayout(const TileInfo *ti, const TileLayoutSpriteGroup *group, byte colour)
{
  const DrawTileSprites *dts = group->ProcessRegisters(nullptr);
 
  SpriteID image = dts->ground.sprite;
  SpriteID pal   = dts->ground.pal;
 
  if (GB(image, 0, SPRITE_WIDTH) != 0) {
    if (image == SPR_FLAT_WATER_TILE && IsTileOnWater(ti->tile)) {
      DrawWaterClassGround(ti);
    } else {
      DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, GENERAL_SPRITE_COLOUR(colour)));
    }
  }
 
  DrawNewGRFTileSeq(ti, dts, TO_BUILDINGS, 0, GENERAL_SPRITE_COLOUR(colour));
}
 
bool DrawNewAirportTile(TileInfo *ti, Station *st, const AirportTileSpec *airts)
{
  if (ti->tileh != SLOPE_FLAT) {
    bool draw_old_one = true;
    if (HasBit(airts->callback_mask, CBM_AIRT_DRAW_FOUNDATIONS)) {
      /* Called to determine the type (if any) of foundation to draw */
      uint32_t callback_res = GetAirportTileCallback(CBID_AIRPTILE_DRAW_FOUNDATIONS, 0, 0, airts, st, ti->tile);
      if (callback_res != CALLBACK_FAILED) draw_old_one = ConvertBooleanCallback(airts->grf_prop.grffile, CBID_AIRPTILE_DRAW_FOUNDATIONS, callback_res);
    }
 
    if (draw_old_one) DrawFoundation(ti, FOUNDATION_LEVELED);
  }
 
  AirportTileResolverObject object(airts, ti->tile, st);
  const SpriteGroup *group = object.Resolve();
  if (group == nullptr || group->type != SGT_TILELAYOUT) {
    return false;
  }
 
  const TileLayoutSpriteGroup *tlgroup = (const TileLayoutSpriteGroup *)group;
  AirportDrawTileLayout(ti, tlgroup, Company::Get(st->owner)->colour);
  return true;
}
 
struct AirportTileAnimationBase : public AnimationBase<AirportTileAnimationBase, AirportTileSpec, Station, int, GetAirportTileCallback, TileAnimationFrameAnimationHelper<Station> > {
  static const CallbackID cb_animation_speed      = CBID_AIRPTILE_ANIMATION_SPEED;
  static const CallbackID cb_animation_next_frame = CBID_AIRPTILE_ANIM_NEXT_FRAME;
 
  static const AirportTileCallbackMask cbm_animation_speed      = CBM_AIRT_ANIM_SPEED;
  static const AirportTileCallbackMask cbm_animation_next_frame = CBM_AIRT_ANIM_NEXT_FRAME;
};
 
void AnimateAirportTile(TileIndex tile)
{
  const AirportTileSpec *ats = AirportTileSpec::GetByTile(tile);
  if (ats == nullptr) return;
 
  AirportTileAnimationBase::AnimateTile(ats, Station::GetByTile(tile), tile, HasBit(ats->animation_special_flags, 0));
}
 
void AirportTileAnimationTrigger(Station *st, TileIndex tile, AirpAnimationTrigger trigger, CargoID cargo_type)
{
  const AirportTileSpec *ats = AirportTileSpec::GetByTile(tile);
  if (!HasBit(ats->animation.triggers, trigger)) return;
 
  AirportTileAnimationBase::ChangeAnimationFrame(CBID_AIRPTILE_ANIM_START_STOP, ats, st, tile, Random(), (uint8_t)trigger | (cargo_type << 8));
}
 
void AirportAnimationTrigger(Station *st, AirpAnimationTrigger trigger, CargoID cargo_type)
{
  if (st->airport.tile == INVALID_TILE) return;
 
  for (TileIndex tile : st->airport) {
    if (st->TileBelongsToAirport(tile)) AirportTileAnimationTrigger(st, tile, trigger, cargo_type);
  }
}