clear_map.h

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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/>.
 */
 
#ifndef CLEAR_MAP_H
#define CLEAR_MAP_H
 
#include "bridge_map.h"
#include "industry_type.h"
 
enum ClearGround : uint8_t {
  CLEAR_GRASS  = 0, 
  CLEAR_ROUGH  = 1, 
  CLEAR_ROCKS  = 2, 
  CLEAR_FIELDS = 3, 
  CLEAR_SNOW   = 4, 
  CLEAR_DESERT = 5, 
};
 
 
inline bool IsSnowTile(Tile t)
{
  assert(IsTileType(t, MP_CLEAR));
  return HasBit(t.m3(), 4);
}
 
inline ClearGround GetClearGround(Tile t)
{
  assert(IsTileType(t, MP_CLEAR));
  return static_cast<ClearGround>(GB(t.m5(), 2, 3));
}
 
inline bool IsClearGround(Tile t, ClearGround ct)
{
  return GetClearGround(t) == ct;
}
 
 
inline uint GetClearDensity(Tile t)
{
  assert(IsTileType(t, MP_CLEAR));
  return GB(t.m5(), 0, 2);
}
 
inline void AddClearDensity(Tile t, int d)
{
  assert(IsTileType(t, MP_CLEAR)); // XXX incomplete
  t.m5() += d;
}
 
inline void SetClearDensity(Tile t, uint d)
{
  assert(IsTileType(t, MP_CLEAR));
  SB(t.m5(), 0, 2, d);
}
 
 
inline uint GetClearCounter(Tile t)
{
  assert(IsTileType(t, MP_CLEAR));
  return GB(t.m5(), 5, 3);
}
 
inline void AddClearCounter(Tile t, int c)
{
  assert(IsTileType(t, MP_CLEAR)); // XXX incomplete
  t.m5() += c << 5;
}
 
inline void SetClearCounter(Tile t, uint c)
{
  assert(IsTileType(t, MP_CLEAR)); // XXX incomplete
  SB(t.m5(), 5, 3, c);
}
 
 
inline void SetClearGroundDensity(Tile t, ClearGround type, uint density)
{
  assert(IsTileType(t, MP_CLEAR)); // XXX incomplete
  t.m5() = 0 << 5 | type << 2 | density;
}
 
 
inline uint GetFieldType(Tile t)
{
  assert(GetClearGround(t) == CLEAR_FIELDS);
  return GB(t.m3(), 0, 4);
}
 
inline void SetFieldType(Tile t, uint f)
{
  assert(GetClearGround(t) == CLEAR_FIELDS); // XXX incomplete
  SB(t.m3(), 0, 4, f);
}
 
inline IndustryID GetIndustryIndexOfField(Tile t)
{
  assert(GetClearGround(t) == CLEAR_FIELDS);
  return(IndustryID) t.m2();
}
 
inline void SetIndustryIndexOfField(Tile t, IndustryID i)
{
  assert(GetClearGround(t) == CLEAR_FIELDS);
  t.m2() = i.base();
}
 
 
inline uint GetFence(Tile t, DiagDirection side)
{
  assert(IsClearGround(t, CLEAR_FIELDS));
  switch (side) {
    default: NOT_REACHED();
    case DIAGDIR_SE: return GB(t.m4(), 2, 3);
    case DIAGDIR_SW: return GB(t.m4(), 5, 3);
    case DIAGDIR_NE: return GB(t.m3(), 5, 3);
    case DIAGDIR_NW: return GB(t.m6(), 2, 3);
  }
}
 
inline void SetFence(Tile t, DiagDirection side, uint h)
{
  assert(IsClearGround(t, CLEAR_FIELDS));
  switch (side) {
    default: NOT_REACHED();
    case DIAGDIR_SE: SB(t.m4(), 2, 3, h); break;
    case DIAGDIR_SW: SB(t.m4(), 5, 3, h); break;
    case DIAGDIR_NE: SB(t.m3(), 5, 3, h); break;
    case DIAGDIR_NW: SB(t.m6(), 2, 3, h); break;
  }
}
 
 
inline void MakeClear(Tile t, ClearGround g, uint density)
{
  SetTileType(t, MP_CLEAR);
  t.m1() = 0;
  SetTileOwner(t, OWNER_NONE);
  t.m2() = 0;
  t.m3() = 0;
  t.m4() = 0 << 5 | 0 << 2;
  SetClearGroundDensity(t, g, density); // Sets m5
  t.m6() = 0;
  t.m7() = 0;
  t.m8() = 0;
}
 
 
inline void MakeField(Tile t, uint field_type, IndustryID industry)
{
  SetTileType(t, MP_CLEAR);
  t.m1() = 0;
  SetTileOwner(t, OWNER_NONE);
  t.m2() = industry.base();
  t.m3() = field_type;
  t.m4() = 0 << 5 | 0 << 2;
  SetClearGroundDensity(t, CLEAR_FIELDS, 3);
  SB(t.m6(), 2, 4, 0);
  t.m7() = 0;
  t.m8() = 0;
}
 
inline void MakeSnow(Tile t, uint density = 0)
{
  assert(!IsSnowTile(t));
  SetBit(t.m3(), 4);
  if (GetClearGround(t) == CLEAR_FIELDS) {
    SetClearGroundDensity(t, CLEAR_GRASS, density);
  } else {
    SetClearDensity(t, density);
  }
}
 
inline void ClearSnow(Tile t)
{
  assert(IsSnowTile(t));
  ClrBit(t.m3(), 4);
  SetClearDensity(t, 3);
}
 
#endif /* CLEAR_MAP_H */