CentrED

(*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License, Version 1.0 only

 * (the "License").  You may not use this file except in compliance

 * with the License.

 *

 * You can obtain a copy of the license at

 * http://www.opensource.org/licenses/cddl1.php.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at

 * http://www.opensource.org/licenses/cddl1.php.  If applicable,

 * add the following below this CDDL HEADER, with the fields enclosed

 * by brackets "[]" replaced with your own identifying * information:

 *      Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 *

 *

 *      Portions Copyright 2009 Andreas Schneider

 *)

unit ULandscape;

{$mode objfpc}{$H+}

interface

uses

  SysUtils, Classes, math, UGenericIndex, UMap, UStatics, UWorldItem, UMulBlock,

  UTileDataProvider, URadarMap,

  UCacheManager, ULinkedList, UBufferedStreams,

  UEnhancedMemoryStream, UPacketHandlers, UPackets, UNetState, UEnums;

type

  PRadarBlock = ^TRadarBlock;

  TRadarBlock = array[0..7, 0..7] of Word;

  TBlockSubscriptions = array of TLinkedList;

  { TSeperatedStaticBlock }

  TSeperatedStaticBlock = class(TStaticBlock)

    constructor Create(AData: TStream; AIndex: TGenericIndex; AX, AY: Word); overload;

    constructor Create(AData: TStream; AIndex: TGenericIndex); overload;

    destructor Destroy; override;

  protected

    FTiledataProvider: TTiledataProvider;

  public

    { Fields }

    Cells: array[0..63] of TStaticItemList;

    property TiledataProvider: TTiledataProvider read FTiledataProvider

      write FTiledataProvider;

    { Methods }

    function Clone: TSeperatedStaticBlock; override;

    function GetSize: Integer; override;

    procedure RebuildList;

  end;

  { TBlock }

  TBlock = class

    constructor Create(AMap: TMapBlock; AStatics: TSeperatedStaticBlock);

    destructor Destroy; override;

  protected

    FMapBlock: TMapBlock;

    FStaticBlock: TSeperatedStaticBlock;

  public

    property Map: TMapBlock read FMapBlock;

    property Static: TSeperatedStaticBlock read FStaticBlock;

  end;

  TBlockCache = specialize TCacheManager<TBlock>;

  { TLandscape }

  TLandscape = class

    constructor Create(AMap, AStatics, AStaIdx, ATiledata, ARadarCol: string;

      AWidth, AHeight: Word; var AValid: Boolean);

    constructor Create(AMap, AStatics, AStaIdx, ATiledata: TStream;

      ARadarCol: string; AWidth, AHeight: Word; var AValid: Boolean);

    destructor Destroy; override;

  protected

    FWidth: Word;

    FHeight: Word;

    FCellWidth: Word;

    FCellHeight: Word;

    FMap: TStream;

    FStatics: TStream;

    FStaIdx: TStream;

    FTiledata: TStream;

    FTiledataProvider: TTiledataProvider;

    FOwnsStreams: Boolean;

    FRadarMap: TRadarMap;

    FBlockCache: TBlockCache;

    FBlockSubscriptions: TBlockSubscriptions;

    procedure OnBlockChanged(ABlock: TMulBlock);

    procedure OnRemoveCachedObject(ABlock: TBlock);

    function GetMapCell(AX, AY: Word): TMapCell;

    function GetStaticList(AX, AY: Word): TStaticItemList;

    function GetBlockSubscriptions(AX, AY: Word): TLinkedList;

    procedure OnDrawMapPacket(ABuffer: TEnhancedMemoryStream;

      ANetState: TNetState);

    procedure OnInsertStaticPacket(ABuffer: TEnhancedMemoryStream;

      ANetState: TNetState);

    procedure OnDeleteStaticPacket(ABuffer: TEnhancedMemoryStream;

      ANetState: TNetState);

    procedure OnElevateStaticPacket(ABuffer: TEnhancedMemoryStream;

      ANetState: TNetState);

    procedure OnMoveStaticPacket(ABuffer: TEnhancedMemoryStream;

      ANetState: TNetState);

    procedure OnHueStaticPacket(ABuffer: TEnhancedMemoryStream;

      ANetState: TNetState);

    procedure OnLargeScaleCommandPacket(ABuffer: TEnhancedMemoryStream;

      ANetState: TNetState);

  public

    property Width: Word read FWidth;

    property Height: Word read FHeight;

    property CellWidth: Word read FCellWidth;

    property CellHeight: Word read FCellHeight;

    property MapCell[X, Y: Word]: TMapCell read GetMapCell;

    property StaticList[X, Y: Word]: TStaticItemList read GetStaticList;

    property BlockSubscriptions[X, Y: Word]: TLinkedList read GetBlockSubscriptions;

    property TiledataProvider: TTiledataProvider read FTiledataProvider;

    function GetMapBlock(AX, AY: Word): TMapBlock;

    function GetStaticBlock(AX, AY: Word): TSeperatedStaticBlock;

    function LoadBlock(AX, AY: Word): TBlock;

    procedure UpdateRadar(AX, AY: Word);

    function GetEffectiveAltitude(ATile: TMapCell): ShortInt;

    function GetLandAlt(AX, AY: Word; ADefault: ShortInt): ShortInt;

    procedure SortStaticsList(AStatics: TStaticItemList);

    procedure Flush;

    procedure SaveBlock(AWorldBlock: TWorldBlock);

    function Validate: Boolean;

  end;

  TStaticInfo = packed record

    X: Word;

    Y: Word;

    Z: ShortInt;

    TileID: Word;

    Hue: Word;

  end;

  TAreaInfo = packed record

    Left: Word;

    Top: Word;

    Right: Word;

    Bottom: Word;

  end;

  TWorldPoint = packed record

    X: Word;

    Y: Word;

  end;

function PointInArea(AArea: TAreaInfo; AX, AY: Word): Boolean; inline;

implementation

uses

  UCEDServer, UConnectionHandling, UConfig, ULargeScaleOperations, Logging;

function GetID(AX, AY: Word): Integer;

begin

  Result := ((AX and $7FFF) shl 15) or (AY and $7FFF);

end;

function PointInArea(AArea: TAreaInfo; AX, AY: Word): Boolean;

begin

  Result := InRange(AX, AArea.Left, AArea.Right) and

            InRange(AY, AArea.Top, AArea.Bottom);

end;

{ TSeperatedStaticBlock }

constructor TSeperatedStaticBlock.Create(AData: TStream; AIndex: TGenericIndex;

  AX, AY: Word);

var

  i: Integer;

  item: TStaticItem;

  block: TMemoryStream;

begin

  inherited Create;

  FItems := TStaticItemList.Create(False);

  FX := AX;

  FY := AY;

  for i := 0 to 63 do

    Cells[i] := TStaticItemList.Create(True);

  if (AData <> nil) and (AIndex.Lookup > 0) and (AIndex.Size > 0) then

  begin

    AData.Position := AIndex.Lookup;

    block := TMemoryStream.Create;

    block.CopyFrom(AData, AIndex.Size);

    block.Position := 0;

    for i := 1 to (AIndex.Size div 7) do

    begin

      item := TStaticItem.Create(Self, block, AX, AY);

      Cells[(item.Y mod 8) * 8 + (item.X mod 8)].Add(item);

    end;

    block.Free;

  end;

end;

constructor TSeperatedStaticBlock.Create(AData: TStream; AIndex: TGenericIndex);

begin

  Create(AData, AIndex, 0, 0);

end;

destructor TSeperatedStaticBlock.Destroy;

var

  i: Integer;

begin

  FreeAndNil(FItems);

  for i := 0 to 63 do

    FreeAndNil(Cells[i]);

  inherited Destroy;

end;

function TSeperatedStaticBlock.Clone: TSeperatedStaticBlock;

begin

  raise Exception.Create('TSeperatedStaticBlock.Clone is not implemented (yet).');

  Result := nil;

end;

function TSeperatedStaticBlock.GetSize: Integer;

begin

  RebuildList;

  Result := inherited GetSize;

end;

procedure TSeperatedStaticBlock.RebuildList;

var

  i, j, solver: Integer;

begin

  FItems.Clear;

  solver := 0;

  for i := 0 to 63 do

  begin

    if Cells[i] <> nil then

    begin

      for j := 0 to Cells[i].Count - 1 do

      begin

        FItems.Add(Cells[i].Items[j]);

        if Cells[i].Items[j].TileID < FTiledataProvider.StaticCount then

        begin

          Cells[i].Items[j].UpdatePriorities(

            FTiledataProvider.StaticTiles[Cells[i].Items[j].TileID], solver);

        end else

          Logger.Send([lcLandscape, lcServer, lcError], 'Cannot find Tiledata ' +

            'for the Static Item with ID $%x.', [Cells[i].Items[j].TileID]);

        Inc(solver);

      end;

    end;

  end;

  Sort;

end;

{ TBlock }

constructor TBlock.Create(AMap: TMapBlock; AStatics: TSeperatedStaticBlock);

begin

  inherited Create;

  FMapBlock := AMap;

  FStaticBlock := AStatics;

end;

destructor TBlock.Destroy;

begin

  FreeAndNil(FMapBlock);

  FreeAndNil(FStaticBlock);

  inherited Destroy;

end;

{ TLandscape }

constructor TLandscape.Create(AMap, AStatics, AStaIdx, ATiledata,

  ARadarCol: string; AWidth, AHeight: Word; var AValid: Boolean);

var

  map, statics, staidx, tiledata: TStream;

begin

  Write(TimeStamp, 'Loading Map');

  map := TFileStream.Create(AMap, fmOpenReadWrite);

  Write(', Statics');

  statics := TFileStream.Create(AStatics, fmOpenReadWrite);

  Write(', StaIdx');

  staidx := TBufferedReader.Create(TFileStream.Create(AStaIdx, fmOpenReadWrite), True);

  Writeln(', Tiledata');

  tiledata := TFileStream.Create(ATiledata, fmOpenRead or fmShareDenyWrite);

  Create(map, statics, staidx, tiledata, ARadarCol, AWidth, AHeight, AValid);

  FOwnsStreams := True;

end;

constructor TLandscape.Create(AMap, AStatics, AStaIdx, ATiledata: TStream;

  ARadarCol: string; AWidth, AHeight: Word; var AValid: Boolean);

var

  blockID: Integer;

begin

  inherited Create;

  FWidth := AWidth;

  FHeight := AHeight;

  FCellWidth := FWidth * 8;

  FCellHeight := FHeight * 8;

  FMap := AMap;

  FStatics := AStatics;

  FStaIdx := AStaIdx;

  FTiledata := ATiledata;

  FOwnsStreams := False;

  AValid := Validate;

  if AValid then

  begin

    Write(TimeStamp, 'Creating Cache');

    FBlockCache := TBlockCache.Create(256);

    FBlockCache.OnRemoveObject := @OnRemoveCachedObject;

    Write(', Tiledata');

    FTiledataProvider := TTiledataProvider.Create(ATiledata);

    Write(', Subscriptions');

    SetLength(FBlockSubscriptions, AWidth * AHeight);

    for blockID := 0 to AWidth * AHeight - 1 do

      FBlockSubscriptions[blockID] := TLinkedList.Create;

    Writeln(', RadarMap');

    FRadarMap := TRadarMap.Create(FMap, FStatics, FStaIdx, FWidth, FHeight,

      ARadarCol);

    RegisterPacketHandler($06, TPacketHandler.Create(8, @OnDrawMapPacket));

    RegisterPacketHandler($07, TPacketHandler.Create(10, @OnInsertStaticPacket));

    RegisterPacketHandler($08, TPacketHandler.Create(10, @OnDeleteStaticPacket));

    RegisterPacketHandler($09, TPacketHandler.Create(11, @OnElevateStaticPacket));

    RegisterPacketHandler($0A, TPacketHandler.Create(14, @OnMoveStaticPacket));

    RegisterPacketHandler($0B, TPacketHandler.Create(12, @OnHueStaticPacket));

    RegisterPacketHandler($0E, TPacketHandler.Create(0, @OnLargeScaleCommandPacket));

  end;

end;

destructor TLandscape.Destroy;

var

  i: Integer;

begin

  for i := 0 to Length(FBlockSubscriptions) - 1 do

    FreeAndNil(FBlockSubscriptions[i]);

  FreeAndNil(FBlockCache);

  FreeAndNil(FTiledataProvider);

  FreeAndNil(FRadarMap);

  if FOwnsStreams then

  begin

    FreeAndNil(FMap);

    FreeAndNil(FStatics);

    FreeAndNil(FStaIdx);

    FreeAndNil(FTiledata);

  end;

  RegisterPacketHandler($06, nil);

  RegisterPacketHandler($07, nil);

  RegisterPacketHandler($08, nil);

  RegisterPacketHandler($09, nil);

  RegisterPacketHandler($0A, nil);

  RegisterPacketHandler($0B, nil);

  RegisterPacketHandler($0E, nil);

  inherited Destroy;

end;

function TLandscape.GetBlockSubscriptions(AX, AY: Word): TLinkedList;

begin

  if (AX >= 0) and (AX <= FWidth) and (AY >= 0) and (AY <= FHeight) then

    Result := FBlockSubscriptions[(AY * FWidth) + AX]

  else

    Result := nil;

end;

function TLandscape.GetMapCell(AX, AY: Word): TMapCell;

var

  block: TMapBlock;

begin

  Result := nil;

  if (AX >= 0) and (AX <= FCellWidth) and (AY >= 0) and (AY <= FCellHeight) then

  begin

    block := GetMapBlock(AX div 8, AY div 8);

    if block <> nil then

      Result := block.Cells[(AY mod 8) * 8 + AX mod 8];

  end;

end;

function TLandscape.GetLandAlt(AX, AY: Word; ADefault: ShortInt): ShortInt;

begin

  if (AX >= 0) and (AX < FCellWidth) and (AY >= 0) and (AY < FCellHeight) then

    Result := MapCell[AX, AY].Altitude

  else

    Result := ADefault;

end;

function TLandscape.GetStaticList(AX, AY: Word): TStaticItemList;

var

  block: TSeperatedStaticBlock;

begin

  Result := nil;

  if (AX >= 0) and (AX <= FCellWidth) and (AY >= 0) and (AY <= FCellHeight) then

  begin

    block := GetStaticBlock(AX div 8, AY div 8);

    if block <> nil then

      Result := block.Cells[(AY mod 8) * 8 + AX mod 8];

  end;

end;

procedure TLandscape.UpdateRadar(AX, AY: Word);

var

  mapTile: TMapCell;

  tile: TWorldItem;

  staticItems: TStaticItemList;

  tiles: TWorldItemList;

  i: Integer;

begin

  if (AX mod 8 = 0) and (AY mod 8 = 0) then

  begin

    staticItems := GetStaticList(AX, AY);

    if staticItems <> nil then

    begin

      tiles := TWorldItemList.Create(False);

      mapTile := GetMapCell(AX, AY);

      if mapTile <> nil then

      begin

        mapTile.Priority := GetEffectiveAltitude(mapTile);

        mapTile.PriorityBonus := 0;

        mapTile.PrioritySolver := 0;

        tiles.Add(mapTile);

      end;

      for i := 0 to staticItems.Count - 1 do

      begin

        if staticItems[i].TileID < FTiledataProvider.StaticCount then

        begin

          staticItems[i].UpdatePriorities(

            FTiledataProvider.StaticTiles[staticItems[i].TileID],

            i + 1);

        end else

          Logger.Send([lcLandscape, lcServer, lcError], 'Cannot find Tiledata ' +

            'for the Static Item with ID $%x.', [staticItems[i].TileID]);

        tiles.Add(staticItems[i]);

      end;

      tiles.Sort(@CompareWorldItems);

      if tiles.Count > 0 then

      begin

        tile := tiles[tiles.Count - 1];

        if tile is TStaticItem then

          FRadarMap.Update(AX div 8, AY div 8, tile.TileID + $4000)

        else

          FRadarMap.Update(AX div 8, AY div 8, tile.TileID)

      end;

      tiles.Free;

    end;

  end;

end;

procedure TLandscape.SortStaticsList(AStatics: TStaticItemList);

var

  i: Integer;

begin

  for i := 0 to AStatics.Count - 1 do

    if AStatics[i].TileID < FTiledataProvider.StaticCount then

    begin

      AStatics[i].UpdatePriorities(

        FTiledataProvider.StaticTiles[AStatics[i].TileID],

        i + 1);

    end else

      Logger.Send([lcLandscape, lcServer, lcError], 'Cannot find Tiledata ' +

        'for the Static Item with ID $%x.', [AStatics[i].TileID]);

  AStatics.Sort(@CompareStaticItems);

end;

function TLandscape.GetEffectiveAltitude(ATile: TMapCell): ShortInt;

var

  north, west, south, east: ShortInt;

begin

  north := ATile.Altitude;

  west := GetLandAlt(ATile.X, ATile.Y + 1, north);

  south := GetLandAlt(ATile.X + 1, ATile.Y + 1, north);

  east := GetLandAlt(ATile.X + 1, ATile.Y, north);

  if Abs(north - south) > Abs(west - east) then

    Result := (north + south) div 2

  else

    Result := (west + east) div 2;

end;

procedure TLandscape.OnBlockChanged(ABlock: TMulBlock);

begin

  // Do nothing for now

end;

procedure TLandscape.OnRemoveCachedObject(ABlock: TBlock);

begin

  if ABlock <> nil then

  begin

    if ABlock.Map.Changed then SaveBlock(ABlock.Map);

    if ABlock.Static.Changed then SaveBlock(ABlock.Static);

  end;

end;

function TLandscape.GetMapBlock(AX, AY: Word): TMapBlock;

var

  block: TBlock;

begin

  Result := nil;

  if (AX >= 0) and (AX < FWidth) and (AY >= 0) and (AY < FHeight) then

  begin

    if FBlockCache.QueryID(GetID(AX, AY), block) then

      Result := block.Map

    else

      Result := LoadBlock(AX, AY).Map;

  end;

end;

function TLandscape.GetStaticBlock(AX, AY: Word): TSeperatedStaticBlock;

var

  block: TBlock;

begin

  Result := nil;

  if (AX >= 0) and (AX < FWidth) and (AY >= 0) and (AY < FHeight) then

  begin

    if FBlockCache.QueryID(GetID(AX, AY), block) then

      Result := TSeperatedStaticBlock(block.Static)

    else

      Result := TSeperatedStaticBlock(LoadBlock(AX, AY).Static);

  end;

end;

function TLandscape.LoadBlock(AX, AY: Word): TBlock;

var

  map: TMapBlock;

  statics: TSeperatedStaticBlock;

  index: TGenericIndex;

begin

  FMap.Position := ((AX * FHeight) + AY) * 196;

  map := TMapBlock.Create(FMap, AX, AY);

  map.OnChanged := @OnBlockChanged;

  FStaIdx.Position := ((AX * FHeight) + AY) * 12;

  index := TGenericIndex.Create(FStaIdx);

  statics := TSeperatedStaticBlock.Create(FStatics, index, AX, AY);

  statics.OnChanged := @OnBlockChanged;

  statics.TiledataProvider := FTiledataProvider;

  index.Free;

  Result := TBlock.Create(map, statics);

  FBlockCache.StoreID(GetID(AX, AY), Result);

end;

//Intelligent write: replace if possible, otherwise extend

procedure TLandscape.Flush;

begin

  FBlockCache.Clear; //Clear writes modified blocks before removing them from the cache

end;

procedure TLandscape.SaveBlock(AWorldBlock: TWorldBlock);

var

  i, j, size: Integer;

  index: TGenericIndex;

begin

  if AWorldBlock is TMapBlock then

  begin

    FMap.Position := ((AWorldBlock.X * FHeight) + AWorldBlock.Y) * 196;

    AWorldBlock.Write(FMap);

    for i := 0 to 63 do

      TMapBlock(AWorldBlock).Cells[i].InitOriginalState;

    AWorldBlock.CleanUp;

  end else if AWorldBlock is TStaticBlock then

  begin

    FStaIdx.Position := ((AWorldBlock.X * FHeight) + AWorldBlock.Y) * 12;

    index := TGenericIndex.Create(FStaIdx);

    size := AWorldBlock.GetSize;

    if (size > index.Size) or (index.Lookup < 0) then

    begin

      FStatics.Position := FStatics.Size;

      index.Lookup := FStatics.Position;

    end;

    index.Size := size;

    if size = 0 then

      index.Lookup := -1

    else

    begin

      FStatics.Position := index.Lookup;

      AWorldBlock.Write(FStatics);

    end;

    FStaIdx.Seek(-12, soFromCurrent);

    index.Write(FStaIdx);

    index.Free;

    for i := 0 to 63 do

      for j := 0 to TSeperatedStaticBlock(AWorldBlock).Cells[i].Count - 1 do

        TStaticItem(TSeperatedStaticBlock(AWorldBlock).Cells[i].Items[j]).InitOriginalState;

    AWorldBlock.CleanUp;

  end;

end;

function TLandscape.Validate: Boolean;

var

  blocks: Integer;

begin

  blocks := FWidth * FHeight;

  FStaIdx.Seek(0, soFromEnd); //workaround for TBufferedStream

  Result := (FMap.Size = (blocks * 196)) and (FStaIdx.Position = (blocks * 12));

end;

procedure TLandscape.OnDrawMapPacket(ABuffer: TEnhancedMemoryStream;

  ANetState: TNetState);

var

  x, y: Word;

  cell: TMapCell;

  subscriptions: TLinkedList;

  subscriptionItem: PLinkedItem;

  packet: TDrawMapPacket;

begin

  x := ABuffer.ReadWord;

  y := ABuffer.ReadWord;

  if not ValidateAccess(ANetState, alNormal, x, y) then Exit;

  cell := GetMapCell(x, y);

  if cell <> nil then

  begin

    cell.Altitude := ABuffer.ReadShortInt;

    cell.TileID := ABuffer.ReadWord;

    packet := TDrawMapPacket.Create(cell);

    subscriptions := FBlockSubscriptions[(y div 8) * FWidth + (x div 8)];

    subscriptionItem := nil;

    while subscriptions.Iterate(subscriptionItem) do

      CEDServerInstance.SendPacket(TNetState(subscriptionItem^.Data), packet, False);

    packet.Free;

    UpdateRadar(x, y);

  end;

end;

procedure TLandscape.OnInsertStaticPacket(ABuffer: TEnhancedMemoryStream;

  ANetState: TNetState);

var

  x, y: Word;

  block: TSeperatedStaticBlock;

  staticItem: TStaticItem;

  targetStaticList: TStaticItemList;

  subscriptions: TLinkedList;

  subscriptionItem: PLinkedItem;

  packet: TInsertStaticPacket;

begin

  x := ABuffer.ReadWord;

  y := ABuffer.ReadWord;

  if not ValidateAccess(ANetState, alNormal, x, y) then Exit;

  block := GetStaticBlock(x div 8, y div 8);

  if block <> nil then

  begin

    staticItem := TStaticItem.Create(nil, nil, 0, 0);

    staticItem.X := x;

    staticItem.Y := y;

    staticItem.Z := ABuffer.ReadShortInt;

    staticItem.TileID := ABuffer.ReadWord;

    staticItem.Hue := ABuffer.ReadWord;

    targetStaticList := block.Cells[(y mod 8) * 8 + x mod 8];

    targetStaticList.Add(staticItem);

    SortStaticsList(targetStaticList);

    staticItem.Owner := block;

    packet := TInsertStaticPacket.Create(staticItem);

    subscriptions := FBlockSubscriptions[(y div 8) * FWidth + (x div 8)];

    subscriptionItem := nil;

    while subscriptions.Iterate(subscriptionItem) do

      CEDServerInstance.SendPacket(TNetState(subscriptionItem^.Data), packet, False);

    packet.Free;

    UpdateRadar(x, y);

  end;

end;

procedure TLandscape.OnDeleteStaticPacket(ABuffer: TEnhancedMemoryStream;

  ANetState: TNetState);

var

  block: TSeperatedStaticBlock;

  i: Integer;

  statics: TStaticItemList;

  staticInfo: TStaticInfo;

  staticItem: TStaticItem;

  subscriptions: TLinkedList;

  subscriptionItem: PLinkedItem;

  packet: TDeleteStaticPacket;

begin

  ABuffer.Read(staticInfo, SizeOf(TStaticInfo));

  if not ValidateAccess(ANetState, alNormal, staticInfo.X, staticInfo.Y) then Exit;

  block := GetStaticBlock(staticInfo.X div 8, staticInfo.Y div 8);

  if block <> nil then

  begin

    statics := block.Cells[(staticInfo.Y mod 8) * 8 + staticInfo.X mod 8];

    for i := 0 to statics.Count - 1 do

    begin

      staticItem := statics[i];

      if (staticItem.Z = staticInfo.Z) and

         (staticItem.TileID = staticInfo.TileID) and

         (staticItem.Hue = staticInfo.Hue) then

      begin

        packet := TDeleteStaticPacket.Create(staticItem);

        staticItem.Delete;

        statics.Delete(i);

        subscriptions := FBlockSubscriptions[(staticInfo.Y div 8) * FWidth +

          (staticInfo.X div 8)];

        subscriptionItem := nil;

        while subscriptions.Iterate(subscriptionItem) do

          CEDServerInstance.SendPacket(TNetState(subscriptionItem^.Data),

            packet, False);

        packet.Free;

        UpdateRadar(staticInfo.X, staticInfo.Y);

        Break;

      end;

    end;

  end;

end;

procedure TLandscape.OnElevateStaticPacket(ABuffer: TEnhancedMemoryStream;

  ANetState: TNetState);

var

  block: TSeperatedStaticBlock;

  i: Integer;

  statics: TStaticItemList;

  staticInfo: TStaticInfo;

  staticItem: TStaticItem;

  newZ: ShortInt;

  subscriptions: TLinkedList;

  subscriptionItem: PLinkedItem;

  packet: TElevateStaticPacket;

begin

  ABuffer.Read(staticInfo, SizeOf(TStaticInfo));

  if not ValidateAccess(ANetState, alNormal, staticInfo.X, staticInfo.Y) then Exit;

  block := GetStaticBlock(staticInfo.X div 8, staticInfo.Y div 8);

  if block <> nil then

  begin

    statics := block.Cells[(staticInfo.Y mod 8) * 8 + staticInfo.X mod 8];

    for i := 0 to statics.Count - 1 do

    begin

      staticItem := statics[i];

      if (staticItem.Z = staticInfo.Z) and

         (staticItem.TileID = staticInfo.TileID) and

         (staticItem.Hue = staticInfo.Hue) then

      begin

        newZ := ABuffer.ReadShortInt;

        packet := TElevateStaticPacket.Create(staticItem, newZ);

        staticItem.Z := newZ;

        SortStaticsList(statics);

        subscriptions := FBlockSubscriptions[(staticInfo.Y div 8) * FWidth +

          (staticInfo.X div 8)];

        subscriptionItem := nil;

        while subscriptions.Iterate(subscriptionItem) do

          CEDServerInstance.SendPacket(TNetState(subscriptionItem^.Data),

            packet, False);

        packet.Free;

        UpdateRadar(staticInfo.X, staticInfo.Y);

        Break;

      end;

    end;

  end;

end;

procedure TLandscape.OnMoveStaticPacket(ABuffer: TEnhancedMemoryStream;

  ANetState: TNetState);

var

  sourceBlock, targetBlock: TSeperatedStaticBlock;

  sourceSubscriptions, targetSubscriptions: TList;

  i: Integer;

  statics: TStaticItemList;

  staticInfo: TStaticInfo;

  staticItem: TStaticItem;

  newX, newY: Word;

  subscriptions: TLinkedList;

  subscriptionItem: PLinkedItem;

  insertPacket: TInsertStaticPacket;

  deletePacket: TDeleteStaticPacket;

  movePacket: TMoveStaticPacket;

begin

  staticItem := nil;

  ABuffer.Read(staticInfo, SizeOf(TStaticInfo));

  newX := EnsureRange(ABuffer.ReadWord, 0, FCellWidth - 1);

  newY := EnsureRange(ABuffer.ReadWord, 0, FCellHeight - 1);

  //Check, if both, source and target, are within a valid region

  if not ValidateAccess(ANetState, alNormal, staticInfo.X, staticInfo.Y) then Exit;

  if not ValidateAccess(ANetState, alNormal, newX, newY) then Exit;

  if (staticInfo.X = newX) and (staticInfo.Y = newY) then Exit;

  if ((abs(staticInfo.X - newX) > 8) or (abs(staticInfo.Y - newY) > 8)) and

     (not ValidateAccess(ANetState, alAdministrator)) then Exit;

  sourceBlock := GetStaticBlock(staticInfo.X div 8, staticInfo.Y div 8);

  targetBlock := GetStaticBlock(newX div 8, newY div 8);

  if (sourceBlock <> nil) and (targetBlock <> nil) then

  begin

    statics := sourceBlock.Cells[(staticInfo.Y mod 8) * 8 + staticInfo.X mod 8];

    i := 0;

    while (i < statics.Count) and (staticItem = nil) do

    begin

      staticItem := statics[i];

      if (staticItem.Z <> staticInfo.Z) or

         (staticItem.TileID <> staticInfo.TileID) or

         (staticItem.Hue <> staticInfo.Hue) then

      begin

        staticItem := nil;

      end;

      Inc(i);

    end;

    if staticItem <> nil then

    begin

      deletePacket := TDeleteStaticPacket.Create(staticItem);

      movePacket := TMoveStaticPacket.Create(staticItem, newX, newY);

      i := statics.IndexOf(staticItem);

      statics[i] := nil;

      statics.Delete(i);

      statics := targetBlock.Cells[(newY mod 8) * 8 + newX mod 8];

      statics.Add(staticItem);

      staticItem.UpdatePos(newX, newY, staticItem.Z);

      staticItem.Owner := targetBlock;

      insertPacket := TInsertStaticPacket.Create(staticItem);

      SortStaticsList(statics);

      sourceSubscriptions := TList.Create;

      subscriptions := FBlockSubscriptions[(staticInfo.Y div 8) * FWidth + (staticInfo.X div 8)];

      subscriptionItem := nil;

      while subscriptions.Iterate(subscriptionItem) do

        sourceSubscriptions.Add(subscriptionItem^.Data);

      targetSubscriptions := TList.Create;

      subscriptions := FBlockSubscriptions[(newY div 8) * FWidth + (newX div 8)];

      subscriptionItem := nil;

      while subscriptions.Iterate(subscriptionItem) do

        targetSubscriptions.Add(subscriptionItem^.Data);

      for i := 0 to sourceSubscriptions.Count - 1 do

      begin

        if targetSubscriptions.IndexOf(sourceSubscriptions.Items[i]) > -1 then

          CEDServerInstance.SendPacket(TNetState(sourceSubscriptions.Items[i]), movePacket, False)

        else

          CEDServerInstance.SendPacket(TNetState(sourceSubscriptions.Items[i]), deletePacket, False);

      end;

      for i := 0 to targetSubscriptions.Count - 1 do

      begin

        if sourceSubscriptions.IndexOf(targetSubscriptions.Items[i]) = -1 then

          CEDServerInstance.SendPacket(TNetState(sourceSubscriptions.Items[i]), insertPacket, False);

      end;

      UpdateRadar(staticInfo.X, staticInfo.Y);

      UpdateRadar(newX, newY);

      insertPacket.Free;

      deletePacket.Free;

      movePacket.Free;

      sourceSubscriptions.Free;

      targetSubscriptions.Free;

    end;

  end;

end;

procedure TLandscape.OnHueStaticPacket(ABuffer: TEnhancedMemoryStream;

  ANetState: TNetState);

var

  block: TSeperatedStaticBlock;

  i: Integer;

  statics: TStaticItemList;

  staticInfo: TStaticInfo;

  staticItem: TStaticItem;

  newHue: Word;

  subscriptions: TLinkedList;

  subscriptionItem: PLinkedItem;

  packet: THueStaticPacket;

begin

  ABuffer.Read(staticInfo, SizeOf(TStaticInfo));

  if not ValidateAccess(ANetState, alNormal, staticInfo.X, staticInfo.Y) then Exit;

  block := GetStaticBlock(staticInfo.X div 8, staticInfo.Y div 8);

  if block <> nil then

  begin

    statics := block.Cells[(staticInfo.Y mod 8) * 8 + staticInfo.X mod 8];

    for i := 0 to statics.Count - 1 do

    begin

      staticItem := statics[i];

      if (staticItem.Z = staticInfo.Z) and

         (staticItem.TileID = staticInfo.TileID) and

         (staticItem.Hue = staticInfo.Hue) then

      begin

        newHue := ABuffer.ReadWord;

        packet := THueStaticPacket.Create(staticItem, newHue);

        staticItem.Hue := newHue;

        subscriptions := FBlockSubscriptions[(staticInfo.Y div 8) * FWidth + (staticInfo.X div 8)];

        subscriptionItem := nil;

        while subscriptions.Iterate(subscriptionItem) do

          CEDServerInstance.SendPacket(TNetState(subscriptionItem^.Data), packet, False);

        packet.Free;

        Break;

      end;

    end;

  end;

end;

procedure TLandscape.OnLargeScaleCommandPacket(ABuffer: TEnhancedMemoryStream;

  ANetState: TNetState);

var

  areaInfo: array of TAreaInfo;

  areaCount: Byte;

  i: Integer;

  blockX, blockY, cellX, cellY, x, y: Word;

  realBlockX, realBlockY, realCellX, realCellY: Word;

  blockOffX, cellOffX, modX, blockOffY, cellOffY, modY: Integer;

  blockID, cellID: Cardinal;

  emptyBits: TBits;

  bitMask: array of TBits;

  mapTile: TMapCell;

  statics: TStaticItemList;

  operations: TList;

  clients: array of record

    NetState: TNetState;

    Blocks: TBlockCoordsArray;

  end;

  netState: TNetState;

  subscriptions: TLinkedList;

  subscriptionItem: PLinkedItem;

  cmOperation: TLSCopyMove;

  additionalAffectedBlocks: TBits;

begin

  if not ValidateAccess(ANetState, alAdministrator) then Exit;

  Writeln(TimeStamp, ANetState.Account.Name, ' begins large scale operation');

  CEDServerInstance.SendPacket(nil, TServerStatePacket.Create(ssOther,

    Format('%s is performing large scale operations ...', [ANetState.Account.Name])));

  //Bitmask

  emptyBits := TBits.Create(64);

  SetLength(bitMask, FWidth * FHeight);

  for i := Low(bitMask) to High(bitMask) do

    bitMask[i] := TBits.Create(64);

  //'additionalAffectedBlocks' is used to store whether a certain block was

  //touched during an operation which was designated to another block (for

  //example by moving items with an offset). This is (indirectly) merged later

  //on.

  additionalAffectedBlocks := TBits.Create(FWidth * FHeight);

  areaCount := ABuffer.ReadByte;

  SetLength(areaInfo, areaCount);

  for i := 0 to areaCount - 1 do

  begin

    areaInfo[i].Left := Max(ABuffer.ReadWord, 0);

    areaInfo[i].Top := Max(ABuffer.ReadWord, 0);

    areaInfo[i].Right := Min(ABuffer.ReadWord, FCellWidth - 1);

    areaInfo[i].Bottom := Min(ABuffer.ReadWord, FCellHeight - 1);

    for x := areaInfo[i].Left to areaInfo[i].Right do

      for y := areaInfo[i].Top to areaInfo[i].Bottom do

      begin

        blockID := (x div 8) * FHeight + (y div 8);

        cellID := (y mod 8) * 8 + (x mod 8);

        bitMask[blockID].Bits[cellID] := True;

      end;

  end;

  //client blocks

  SetLength(clients, 0);

  CEDServerInstance.TCPServer.IterReset;

  while CEDServerInstance.TCPServer.IterNext do

  begin

    netState := TNetState(CEDServerInstance.TCPServer.Iterator.UserData);

    if netState <> nil then

    begin

      SetLength(clients, Length(clients) + 1);

      clients[High(clients)].NetState := netState;

      SetLength(clients[High(clients)].Blocks, 0);

    end;

  end;

  operations := TList.Create;

  cmOperation := nil;

  if ABuffer.ReadBoolean then

  begin

    cmOperation := TLSCopyMove.Init(ABuffer, Self);

    if (cmOperation.OffsetX <> 0) or (cmOperation.OffsetY <> 0) then

    begin

      operations.Add(cmOperation);

      if cmOperation.OffsetX > 0 then

      begin

        blockOffX := FWidth - 1;

        cellOffX := 7;

        modX := -1;

      end else

      begin

        blockOffX := 0;

        cellOffX := 0;

        modX := 1;

      end;

      if cmOperation.OffsetY > 0 then

      begin

        blockOffY := FHeight - 1;

        cellOffY := 7;

        modY := -1;

      end else

      begin

        blockOffY := 0;

        cellOffY := 0;

        modY := 1;

      end;

    end else

      FreeAndNil(cmOperation);

  end;

  if cmOperation = nil then

  begin

    blockOffX := 0;

    cellOffX := 0;

    modX := 1;

    blockOffY := 0;

    cellOffY := 0;

    modY := 1;

  end;

  if ABuffer.ReadBoolean then operations.Add(TLSSetAltitude.Init(ABuffer, Self));

  if ABuffer.ReadBoolean then operations.Add(TLSDrawTerrain.Init(ABuffer, Self));

  if ABuffer.ReadBoolean then operations.Add(TLSDeleteStatics.Init(ABuffer, Self));

  if ABuffer.ReadBoolean then operations.Add(TLSInsertStatics.Init(ABuffer, Self));

  FRadarMap.BeginUpdate;

  for blockX := 0 to FWidth - 1 do

  begin

    realBlockX := blockOffX + modX * blockX;

    for blockY := 0 to FHeight - 1 do

    begin

      realBlockY := blockOffY + modY * blockY;

      blockID := (realBlockX * FHeight) + realBlockY;

      if bitMask[blockID].Equals(emptyBits) then Continue;

      for cellY := 0 to 7 do

      begin

        realCellY := cellOffY + modY * cellY;

        for cellX := 0 to 7 do

        begin

          realCellX := cellOffX + modX * cellX;

          if bitMask[blockID].Bits[(realCellY * 8) + realCellX] then

          begin

            x := realBlockX * 8 + realCellX;

            y := realBlockY * 8 + realCellY;

            mapTile := GetMapCell(x, y);

            statics := GetStaticList(x, y);

            for i := 0 to operations.Count - 1 do

              TLargeScaleOperation(operations.Items[i]).Apply(mapTile, statics,

                additionalAffectedBlocks);

            SortStaticsList(statics);

            UpdateRadar(x, y);

          end;

        end;

      end;

      //Find out, which clients are affected by which blocks.

      //This is used to efficiently update the block subscriptions.

      subscriptions := FBlockSubscriptions[realBlockY * FWidth + realBlockX];

      for i := Low(clients) to High(clients) do

      begin

        subscriptionItem := nil;

        while subscriptions.Iterate(subscriptionItem) do

        begin

          if TNetState(subscriptionItem^.Data) = clients[i].NetState then

          begin

            SetLength(clients[i].Blocks, Length(clients[i].Blocks) + 1);

            with clients[i].Blocks[High(clients[i].Blocks)] do

            begin

              X := realBlockX;

              Y := realBlockY;

            end;

            Break;

          end;

        end;

      end;

    end;

  end;

  //additional blocks

  for blockX := 0 to FWidth - 1 do

  begin

    for blockY := 0 to FHeight - 1 do

    begin

      blockID := (blockX * FHeight) + blockY;

      if bitMask[blockID].Equals(emptyBits) and additionalAffectedBlocks[blockID] then

      begin

        //Update the information, which client is affected on which subscribed

        //block.

        subscriptions := FBlockSubscriptions[blockY * FWidth + blockX];

        for i := Low(clients) to High(clients) do

        begin

          subscriptionItem := nil;

          while subscriptions.Iterate(subscriptionItem) do

          begin

            if TNetState(subscriptionItem^.Data) = clients[i].NetState then

            begin

              SetLength(clients[i].Blocks, Length(clients[i].Blocks) + 1);

              with clients[i].Blocks[High(clients[i].Blocks)] do

              begin

                X := blockX;

                Y := blockY;

              end;

              Break;

            end;

          end;

        end;

        UpdateRadar(blockX * 8, blockY * 8);

      end;

    end;

  end;

  //clean up

  for i := Low(bitMask) to High(bitMask) do

    bitMask[i].Free;

  emptyBits.Free;

  additionalAffectedBlocks.Free;

  for i := 0 to operations.Count - 1 do

    TLargeScaleOperation(operations.Items[i]).Free;

  operations.Free;

  //Update clients

  FRadarMap.EndUpdate;

  for i := Low(clients) to High(clients) do

  begin

    if Length(clients[i].Blocks) > 0 then

    begin

      CEDServerInstance.SendPacket(clients[i].NetState, TCompressedPacket.Create(

        TBlockPacket.Create(clients[i].Blocks, nil)));

      clients[i].NetState.LastAction := Now;

    end;

  end;

  CEDServerInstance.SendPacket(nil, TServerStatePacket.Create(ssRunning));

  Writeln(TimeStamp, 'Large scale operation ended.');

end;

end.