clear_cmd.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 "clear_map.h"
#include "command_func.h"
#include "landscape.h"
#include "genworld.h"
#include "viewport_func.h"
#include "core/random_func.hpp"
#include "newgrf_generic.h"
#include "landscape_cmd.h"
 
#include "table/strings.h"
#include "table/sprites.h"
#include "table/clear_land.h"
 
#include "safeguards.h"
 
static CommandCost ClearTile_Clear(TileIndex tile, DoCommandFlag flags)
{
  static const Price clear_price_table[] = {
    PR_CLEAR_GRASS,
    PR_CLEAR_ROUGH,
    PR_CLEAR_ROCKS,
    PR_CLEAR_FIELDS,
    PR_CLEAR_ROUGH,
    PR_CLEAR_ROUGH,
  };
  CommandCost price(EXPENSES_CONSTRUCTION);
 
  if (!IsClearGround(tile, CLEAR_GRASS) || GetClearDensity(tile) != 0) {
    price.AddCost(_price[clear_price_table[GetClearGround(tile)]]);
  }
 
  if (flags & DC_EXEC) DoClearSquare(tile);
 
  return price;
}
 
void DrawClearLandTile(const TileInfo *ti, uint8_t set)
{
  DrawGroundSprite(SPR_FLAT_BARE_LAND + SlopeToSpriteOffset(ti->tileh) + set * 19, PAL_NONE);
}
 
void DrawHillyLandTile(const TileInfo *ti)
{
  if (ti->tileh != SLOPE_FLAT) {
    DrawGroundSprite(SPR_FLAT_ROUGH_LAND + SlopeToSpriteOffset(ti->tileh), PAL_NONE);
  } else {
    DrawGroundSprite(_landscape_clear_sprites_rough[GB(TileHash(ti->x, ti->y), 0, 3)], PAL_NONE);
  }
}
 
static void DrawClearLandFence(const TileInfo *ti)
{
  /* combine fences into one sprite object */
  StartSpriteCombine();
 
  int maxz = GetSlopeMaxPixelZ(ti->tileh);
 
  uint fence_nw = GetFence(ti->tile, DIAGDIR_NW);
  if (fence_nw != 0) {
    int z = GetSlopePixelZInCorner(ti->tileh, CORNER_W);
    SpriteID sprite = _clear_land_fence_sprites[fence_nw - 1] + _fence_mod_by_tileh_nw[ti->tileh];
    AddSortableSpriteToDraw(sprite, PAL_NONE, ti->x, ti->y - 16, 16, 32, maxz - z + 4, ti->z + z, false, 0, 16, -z);
  }
 
  uint fence_ne = GetFence(ti->tile, DIAGDIR_NE);
  if (fence_ne != 0) {
    int z = GetSlopePixelZInCorner(ti->tileh, CORNER_E);
    SpriteID sprite = _clear_land_fence_sprites[fence_ne - 1] + _fence_mod_by_tileh_ne[ti->tileh];
    AddSortableSpriteToDraw(sprite, PAL_NONE, ti->x - 16, ti->y, 32, 16, maxz - z + 4, ti->z + z, false, 16, 0, -z);
  }
 
  uint fence_sw = GetFence(ti->tile, DIAGDIR_SW);
  uint fence_se = GetFence(ti->tile, DIAGDIR_SE);
 
  if (fence_sw != 0 || fence_se != 0) {
    int z = GetSlopePixelZInCorner(ti->tileh, CORNER_S);
 
    if (fence_sw != 0) {
      SpriteID sprite = _clear_land_fence_sprites[fence_sw - 1] + _fence_mod_by_tileh_sw[ti->tileh];
      AddSortableSpriteToDraw(sprite, PAL_NONE, ti->x, ti->y, 16, 16, maxz - z + 4, ti->z + z, false, 0, 0, -z);
    }
 
    if (fence_se != 0) {
      SpriteID sprite = _clear_land_fence_sprites[fence_se - 1] + _fence_mod_by_tileh_se[ti->tileh];
      AddSortableSpriteToDraw(sprite, PAL_NONE, ti->x, ti->y, 16, 16, maxz - z + 4, ti->z + z, false, 0, 0, -z);
    }
  }
  EndSpriteCombine();
}
 
static void DrawTile_Clear(TileInfo *ti)
{
  switch (GetClearGround(ti->tile)) {
    case CLEAR_GRASS:
      DrawClearLandTile(ti, GetClearDensity(ti->tile));
      break;
 
    case CLEAR_ROUGH:
      DrawHillyLandTile(ti);
      break;
 
    case CLEAR_ROCKS:
      DrawGroundSprite((HasGrfMiscBit(GMB_SECOND_ROCKY_TILE_SET) && (TileHash(ti->x, ti->y) & 1) ? SPR_FLAT_ROCKY_LAND_2 : SPR_FLAT_ROCKY_LAND_1) + SlopeToSpriteOffset(ti->tileh), PAL_NONE);
      break;
 
    case CLEAR_FIELDS:
      DrawGroundSprite(_clear_land_sprites_farmland[GetFieldType(ti->tile)] + SlopeToSpriteOffset(ti->tileh), PAL_NONE);
      DrawClearLandFence(ti);
      break;
 
    case CLEAR_SNOW:
    case CLEAR_DESERT:
      DrawGroundSprite(_clear_land_sprites_snow_desert[GetClearDensity(ti->tile)] + SlopeToSpriteOffset(ti->tileh), PAL_NONE);
      break;
  }
 
  DrawBridgeMiddle(ti);
}
 
static int GetSlopePixelZ_Clear(TileIndex tile, uint x, uint y, bool)
{
  auto [tileh, z] = GetTilePixelSlope(tile);
 
  return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
}
 
static Foundation GetFoundation_Clear(TileIndex, Slope)
{
  return FOUNDATION_NONE;
}
 
static void UpdateFences(TileIndex tile)
{
  assert(IsTileType(tile, MP_CLEAR) && IsClearGround(tile, CLEAR_FIELDS));
  bool dirty = false;
 
  for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
    if (GetFence(tile, dir) != 0) continue;
    TileIndex neighbour = tile + TileOffsByDiagDir(dir);
    if (IsTileType(neighbour, MP_CLEAR) && IsClearGround(neighbour, CLEAR_FIELDS)) continue;
    SetFence(tile, dir, 3);
    dirty = true;
  }
 
  if (dirty) MarkTileDirtyByTile(tile);
}
 
 
static void TileLoopClearAlps(TileIndex tile)
{
  int k = GetTileZ(tile) - GetSnowLine() + 1;
 
  if (!IsSnowTile(tile)) {
    /* Below the snow line, do nothing if no snow. */
    /* At or above the snow line, make snow tile if needed. */
    if (k >= 0) {
      MakeSnow(tile);
      MarkTileDirtyByTile(tile);
    }
    return;
  }
 
  /* Update snow density. */
  uint current_density = GetClearDensity(tile);
  uint req_density = (k < 0) ? 0u : std::min<uint>(k, 3u);
 
  if (current_density == req_density) {
    /* Density at the required level. */
    if (k >= 0) return;
    ClearSnow(tile);
  } else {
    AddClearDensity(tile, current_density < req_density ? 1 : -1);
  }
 
  MarkTileDirtyByTile(tile);
}
 
static inline bool NeighbourIsNormal(TileIndex tile)
{
  for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
    TileIndex t = tile + TileOffsByDiagDir(dir);
    if (!IsValidTile(t)) continue;
    if (GetTropicZone(t) != TROPICZONE_DESERT) return true;
    if (HasTileWaterClass(t) && GetWaterClass(t) == WATER_CLASS_SEA) return true;
  }
  return false;
}
 
static void TileLoopClearDesert(TileIndex tile)
{
  /* Current desert level - 0 if it is not desert */
  uint current = 0;
  if (IsClearGround(tile, CLEAR_DESERT)) current = GetClearDensity(tile);
 
  /* Expected desert level - 0 if it shouldn't be desert */
  uint expected = 0;
  if (GetTropicZone(tile) == TROPICZONE_DESERT) {
    expected = NeighbourIsNormal(tile) ? 1 : 3;
  }
 
  if (current == expected) return;
 
  if (expected == 0) {
    SetClearGroundDensity(tile, CLEAR_GRASS, 3);
  } else {
    /* Transition from clear to desert is not smooth (after clearing desert tile) */
    SetClearGroundDensity(tile, CLEAR_DESERT, expected);
  }
 
  MarkTileDirtyByTile(tile);
}
 
static void TileLoop_Clear(TileIndex tile)
{
  AmbientSoundEffect(tile);
 
  switch (_settings_game.game_creation.landscape) {
    case LandscapeType::Tropic: TileLoopClearDesert(tile); break;
    case LandscapeType::Arctic: TileLoopClearAlps(tile);   break;
    default: break;
  }
 
  switch (GetClearGround(tile)) {
    case CLEAR_GRASS:
      if (GetClearDensity(tile) == 3) return;
 
      if (_game_mode != GM_EDITOR) {
        if (GetClearCounter(tile) < 7) {
          AddClearCounter(tile, 1);
          return;
        } else {
          SetClearCounter(tile, 0);
          AddClearDensity(tile, 1);
        }
      } else {
        SetClearGroundDensity(tile, GB(Random(), 0, 8) > 21 ? CLEAR_GRASS : CLEAR_ROUGH, 3);
      }
      break;
 
    case CLEAR_FIELDS:
      UpdateFences(tile);
 
      if (_game_mode == GM_EDITOR) return;
 
      if (GetClearCounter(tile) < 7) {
        AddClearCounter(tile, 1);
        return;
      } else {
        SetClearCounter(tile, 0);
      }
 
      if (GetIndustryIndexOfField(tile) == INVALID_INDUSTRY && GetFieldType(tile) >= 7) {
        /* This farmfield is no longer farmfield, so make it grass again */
        MakeClear(tile, CLEAR_GRASS, 2);
      } else {
        uint field_type = GetFieldType(tile);
        field_type = (field_type < 8) ? field_type + 1 : 0;
        SetFieldType(tile, field_type);
      }
      break;
 
    default:
      return;
  }
 
  MarkTileDirtyByTile(tile);
}
 
void GenerateClearTile()
{
  uint i, gi;
  TileIndex tile;
 
  /* add rough tiles */
  i = Map::ScaleBySize(GB(Random(), 0, 10) + 0x400);
  gi = Map::ScaleBySize(GB(Random(), 0, 7) + 0x80);
 
  SetGeneratingWorldProgress(GWP_ROUGH_ROCKY, gi + i);
  do {
    IncreaseGeneratingWorldProgress(GWP_ROUGH_ROCKY);
    tile = RandomTile();
    if (IsTileType(tile, MP_CLEAR) && !IsClearGround(tile, CLEAR_DESERT)) SetClearGroundDensity(tile, CLEAR_ROUGH, 3);
  } while (--i);
 
  /* add rocky tiles */
  i = gi;
  do {
    uint32_t r = Random();
    tile = RandomTileSeed(r);
 
    IncreaseGeneratingWorldProgress(GWP_ROUGH_ROCKY);
    if (IsTileType(tile, MP_CLEAR) && !IsClearGround(tile, CLEAR_DESERT)) {
      uint j = GB(r, 16, 4) + 5;
      for (;;) {
        TileIndex tile_new;
 
        SetClearGroundDensity(tile, CLEAR_ROCKS, 3);
        MarkTileDirtyByTile(tile);
        do {
          if (--j == 0) goto get_out;
          tile_new = tile + TileOffsByDiagDir((DiagDirection)GB(Random(), 0, 2));
        } while (!IsTileType(tile_new, MP_CLEAR) || IsClearGround(tile_new, CLEAR_DESERT));
        tile = tile_new;
      }
get_out:;
    }
  } while (--i);
}
 
static TrackStatus GetTileTrackStatus_Clear(TileIndex, TransportType, uint, DiagDirection)
{
  return 0;
}
 
static const StringID _clear_land_str[] = {
  STR_LAI_CLEAR_DESCRIPTION_GRASS,
  STR_LAI_CLEAR_DESCRIPTION_ROUGH_LAND,
  STR_LAI_CLEAR_DESCRIPTION_ROCKS,
  STR_LAI_CLEAR_DESCRIPTION_FIELDS,
  STR_LAI_CLEAR_DESCRIPTION_SNOW_COVERED_LAND,
  STR_LAI_CLEAR_DESCRIPTION_DESERT
};
 
static void GetTileDesc_Clear(TileIndex tile, TileDesc *td)
{
  if (IsClearGround(tile, CLEAR_GRASS) && GetClearDensity(tile) == 0) {
    td->str = STR_LAI_CLEAR_DESCRIPTION_BARE_LAND;
  } else {
    td->str = _clear_land_str[GetClearGround(tile)];
  }
  td->owner[0] = GetTileOwner(tile);
}
 
static void ChangeTileOwner_Clear(TileIndex, Owner, Owner)
{
  return;
}
 
static CommandCost TerraformTile_Clear(TileIndex tile, DoCommandFlag flags, int, Slope)
{
  return Command<CMD_LANDSCAPE_CLEAR>::Do(flags, tile);
}
 
extern const TileTypeProcs _tile_type_clear_procs = {
  DrawTile_Clear,           
  GetSlopePixelZ_Clear,     
  ClearTile_Clear,          
  nullptr,                     
  GetTileDesc_Clear,        
  GetTileTrackStatus_Clear, 
  nullptr,                     
  nullptr,                     
  TileLoop_Clear,           
  ChangeTileOwner_Clear,    
  nullptr,                     
  nullptr,                     
  GetFoundation_Clear,      
  TerraformTile_Clear,      
};