X-Git-Url: http://deadsoftware.ru/gitweb?a=blobdiff_plain;f=src%2Fgame%2Fg_grid.pas;h=2afca2f3c16c0db534a6ec68cb4bb665c200e186;hb=36deb8d4595b015f77465c8eaee2bc75e9308d99;hp=9f14d3d5f69481dc9f6a6763cbb356c9e3b2f4f9;hpb=984a31dcc2636073083a3a3cf8d4d409019d211a;p=d2df-sdl.git

diff --git a/src/game/g_grid.pas b/src/game/g_grid.pas
index 9f14d3d..2afca2f 100644
--- a/src/game/g_grid.pas
+++ b/src/game/g_grid.pas
@@ -13,92 +13,358 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *)
-{$MODE DELPHI}
-{$modeswitch nestedprocvars}
+// universal spatial grid
+{$INCLUDE ../shared/a_modes.inc}
+{$IF DEFINED(D2F_DEBUG)}
+  {.$DEFINE D2F_DEBUG_RAYTRACE}
+  {.$DEFINE D2F_DEBUG_XXQ}
+  {.$DEFINE D2F_DEBUG_MOVER}
+{$ENDIF}
 unit g_grid;
 
 interface
 
-uses e_log;
-
-const
-  GridDefaultTileSize = 32;
 
 type
-  GridQueryCB = function (obj: TObject; tag: Integer): Boolean is nested; // return `true` to stop
+  TBodyProxyId = Integer;
 
-type
-  TBodyGrid = class;
+  generic TBodyGridBase<ITP> = class(TObject)
+  public
+    type TGridQueryCB = function (obj: ITP; tag: Integer): Boolean is nested; // return `true` to stop
+    type TGridRayQueryCB = function (obj: ITP; tag: Integer; x, y, prevx, prevy: Integer): Boolean is nested; // return `true` to stop
+    type TGridAlongQueryCB = function (obj: ITP; tag: Integer): Boolean is nested; // return `true` to stop
+
+    type TCellQueryCB = procedure (x, y: Integer) is nested; // top-left cell corner coords
+
+    const TagDisabled = $40000000;
+    const TagFullMask = $3fffffff;
 
-  TBodyProxy = class(TObject)
   private
-    mX, mY, mWidth, mHeight: Integer; // aabb
-    mQueryMark: DWord; // was this object visited at this query?
-    mObj: TObject;
-    mGrid: TBodyGrid;
-    mTag: Integer;
+    const
+      GridDefaultTileSize = 32; // must be power of two!
+      GridCellBucketSize = 8; // WARNING! can't be less than 2!
 
-  public
-    constructor Create (aGrid: TBodyGrid; aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
-    destructor Destroy (); override;
+  private
+    type
+      PBodyProxyRec = ^TBodyProxyRec;
+      TBodyProxyRec = record
+      private
+        mX, mY, mWidth, mHeight: Integer; // aabb
+        mQueryMark: LongWord; // was this object visited at this query?
+        mObj: ITP;
+        mTag: Integer; // `TagDisabled` set: disabled ;-)
+        nextLink: TBodyProxyId; // next free or nothing
 
-    property x: Integer read mX;
-    property y: Integer read mY;
-    property width: Integer read mWidth;
-    property height: Integer read mHeight;
-    property obj: TObject read mObj;
-    property tag: Integer read mTag;
-    property grid: TBodyGrid read mGrid;
-  end;
+      private
+        procedure setup (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer);
+      end;
 
-  PGridCell = ^TGridCell;
-  TGridCell = record
-    body: TBodyProxy;
-    next: Integer; // in this cell; index in mCells
-  end;
+      PGridCell = ^TGridCell;
+      TGridCell = record
+        bodies: array [0..GridCellBucketSize-1] of Integer; // -1: end of list
+        next: Integer; // in this cell; index in mCells
+      end;
+
+      TGridInternalCB = function (grida: Integer; bodyId: TBodyProxyId): Boolean of object; // return `true` to stop
+
+  private
+    //mTileSize: Integer;
+    const mTileSize = GridDefaultTileSize;
+
+  public
+    const tileSize = mTileSize;
 
-  TBodyGrid = class(TObject)
   private
-    mTileSize: Integer;
+    mMinX, mMinY: Integer; // so grids can start at any origin
     mWidth, mHeight: Integer; // in tiles
     mGrid: array of Integer; // mWidth*mHeight, index in mCells
     mCells: array of TGridCell; // cell pool
     mFreeCell: Integer; // first free cell index or -1
-    mLastQuery: Integer;
+    mLastQuery: LongWord;
     mUsedCells: Integer;
+    mProxies: array of TBodyProxyRec;
+    mProxyFree: TBodyProxyId; // free
+    mProxyCount: Integer; // currently used
+    mProxyMaxCount: Integer;
+
+  public
+    dbgShowTraceLog: Boolean;
+    {$IF DEFINED(D2F_DEBUG)}
+    dbgRayTraceTileHitCB: TCellQueryCB;
+    {$ENDIF}
 
   private
-    function allocCell: Integer;
+    function allocCell (): Integer;
     procedure freeCell (idx: Integer); // `next` is simply overwritten
 
-    procedure insert (body: TBodyProxy);
-    procedure remove (body: TBodyProxy);
+    function allocProxy (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer): TBodyProxyId;
+    procedure freeProxy (body: TBodyProxyId);
+
+    procedure insertInternal (body: TBodyProxyId);
+    procedure removeInternal (body: TBodyProxyId);
+
+    function forGridRect (x, y, w, h: Integer; cb: TGridInternalCB; bodyId: TBodyProxyId): Boolean;
+
+    function inserter (grida: Integer; bodyId: TBodyProxyId): Boolean;
+    function remover (grida: Integer; bodyId: TBodyProxyId): Boolean;
+
+    function getProxyEnabled (pid: TBodyProxyId): Boolean; inline;
+    procedure setProxyEnabled (pid: TBodyProxyId; val: Boolean); inline;
+
+    function getGridWidthPx (): Integer; inline;
+    function getGridHeightPx (): Integer; inline;
 
   public
-    constructor Create (aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
+    constructor Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer{; aTileSize: Integer=GridDefaultTileSize});
     destructor Destroy (); override;
 
-    function insertBody (aObj: TObject; ax, ay, aWidth, aHeight: Integer; aTag: Integer=0): TBodyProxy;
-    procedure moveBody (body: TBodyProxy; dx, dy: Integer);
-    procedure resizeBody (body: TBodyProxy; sx, sy: Integer);
-    procedure moveResizeBody (body: TBodyProxy; dx, dy, sx, sy: Integer);
+    function insertBody (aObj: ITP; ax, ay, aWidth, aHeight: Integer; aTag: Integer=-1): TBodyProxyId;
+    procedure removeBody (body: TBodyProxyId); // WARNING! this WILL destroy proxy!
+
+    procedure moveBody (body: TBodyProxyId; nx, ny: Integer);
+    procedure resizeBody (body: TBodyProxyId; nw, nh: Integer);
+    procedure moveResizeBody (body: TBodyProxyId; nx, ny, nw, nh: Integer);
+
+    function insideGrid (x, y: Integer): Boolean; inline;
+
+    // `false` if `body` is surely invalid
+    function getBodyXY (body: TBodyProxyId; out rx, ry: Integer): Boolean; inline;
+    function getBodyWH (body: TBodyProxyId; out rw, rh: Integer): Boolean; inline;
+    function getBodyDims (body: TBodyProxyId; out rx, ry, rw, rh: Integer): Boolean; inline;
 
-    function forEachInAABB (x, y, w, h: Integer; cb: GridQueryCB): Boolean;
+    //WARNING: don't modify grid while any query is in progress (no checks are made!)
+    //         you can set enabled/disabled flag, tho (but iterator can still return objects disabled inside it)
+    // no callback: return `true` on the first hit
+    function forEachInAABB (x, y, w, h: Integer; cb: TGridQueryCB; tagmask: Integer=-1; allowDisabled: Boolean=false): ITP;
 
-    function getProxyForBody (aObj: TObject; x, y, w, h: Integer): TBodyProxy;
+    //WARNING: don't modify grid while any query is in progress (no checks are made!)
+    //         you can set enabled/disabled flag, tho (but iterator can still return objects disabled inside it)
+    // no callback: return object on the first hit or nil
+    function forEachAtPoint (x, y: Integer; cb: TGridQueryCB; tagmask: Integer=-1; exittag: PInteger=nil): ITP;
 
+    //WARNING: don't modify grid while any query is in progress (no checks are made!)
+    //         you can set enabled/disabled flag, tho (but iterator can still return objects disabled inside it)
+    // cb with `(nil)` will be called before processing new tile
+    // no callback: return object of the nearest hit or nil
+    // if `inverted` is true, trace will register bodies *exluding* tagmask
+    //WARNING: don't change tags in callbacks here!
+    function traceRay (const x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP; overload;
+    function traceRay (out ex, ey: Integer; const ax0, ay0, ax1, ay1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP;
+
+    //function traceRayWhileIn (const x0, y0, x1, y1: Integer; tagmask: Integer=-1): ITP; overload;
+    //function traceRayWhileIn (out ex, ey: Integer; const ax0, ay0, ax1, ay1: Integer; tagmask: Integer=-1): ITP;
+
+    //WARNING: don't modify grid while any query is in progress (no checks are made!)
+    //         you can set enabled/disabled flag, tho (but iterator can still return objects disabled inside it)
+    // trace line along the grid, calling `cb` for all objects in passed cells, in no particular order
+    //WARNING: don't change tags in callbacks here!
+    function forEachAlongLine (const x0, y0, x1, y1: Integer; cb: TGridAlongQueryCB; tagmask: Integer=-1; log: Boolean=false): ITP;
+
+    // debug
+    procedure forEachBodyCell (body: TBodyProxyId; cb: TCellQueryCB);
+    function forEachInCell (x, y: Integer; cb: TGridQueryCB): ITP;
     procedure dumpStats ();
+
+    //WARNING! no sanity checks!
+    property proxyEnabled[pid: TBodyProxyId]: Boolean read getProxyEnabled write setProxyEnabled;
+
+    property gridX0: Integer read mMinX;
+    property gridY0: Integer read mMinY;
+    property gridWidth: Integer read getGridWidthPx; // in pixels
+    property gridHeight: Integer read getGridHeightPx; // in pixels
   end;
 
 
+// you are not supposed to understand this
+// returns `true` if there is an intersection, and enter coords
+// enter coords will be equal to (x0, y0) if starting point is inside the box
+// if result is `false`, `inx` and `iny` are undefined
+function lineAABBIntersects (x0, y0, x1, y1: Integer; bx, by, bw, bh: Integer; out inx, iny: Integer): Boolean;
+
+function distanceSq (x0, y0, x1, y1: Integer): Integer; inline;
+
+procedure swapInt (var a: Integer; var b: Integer); inline;
+function minInt (a, b: Integer): Integer; inline;
+function maxInt (a, b: Integer): Integer; inline;
+
+
 implementation
 
 uses
-  SysUtils;
+  SysUtils, e_log;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+procedure swapInt (var a: Integer; var b: Integer); inline; var t: Integer; begin t := a; a := b; b := t; end;
+function minInt (a, b: Integer): Integer; inline; begin if (a < b) then result := a else result := b; end;
+function maxInt (a, b: Integer): Integer; inline; begin if (a > b) then result := a else result := b; end;
+
+function distanceSq (x0, y0, x1, y1: Integer): Integer; inline; begin result := (x1-x0)*(x1-x0)+(y1-y0)*(y1-y0); end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+// you are not supposed to understand this
+// returns `true` if there is an intersection, and enter coords
+// enter coords will be equal to (x0, y0) if starting point is inside the box
+// if result is `false`, `inx` and `iny` are undefined
+function lineAABBIntersects (x0, y0, x1, y1: Integer; bx, by, bw, bh: Integer; out inx, iny: Integer): Boolean;
+var
+  wx0, wy0, wx1, wy1: Integer; // window coordinates
+  stx, sty: Integer; // "steps" for x and y axes
+  dsx, dsy: Integer; // "lengthes" for x and y axes
+  dx2, dy2: Integer; // "double lengthes" for x and y axes
+  xd, yd: Integer; // current coord
+  e: Integer; // "error" (as in bresenham algo)
+  rem: Integer;
+  //!term: Integer;
+  d0, d1: PInteger;
+  xfixed: Boolean;
+  temp: Integer;
+begin
+  result := false;
+  // why not
+  inx := x0;
+  iny := y0;
+  if (bw < 1) or (bh < 1) then exit; // impossible box
+
+  if (x0 = x1) and (y0 = y1) then
+  begin
+    // check this point
+    result := (x0 >= bx) and (y0 >= by) and (x0 < bx+bw) and (y0 < by+bh);
+    exit;
+  end;
+
+  // check if staring point is inside the box
+  if (x0 >= bx) and (y0 >= by) and (x0 < bx+bw) and (y0 < by+bh) then begin result := true; exit; end;
+
+  // clip rectange
+  wx0 := bx;
+  wy0 := by;
+  wx1 := bx+bw-1;
+  wy1 := by+bh-1;
+
+  // horizontal setup
+  if (x0 < x1) then
+  begin
+    // from left to right
+    if (x0 > wx1) or (x1 < wx0) then exit; // out of screen
+    stx := 1; // going right
+  end
+  else
+  begin
+    // from right to left
+    if (x1 > wx1) or (x0 < wx0) then exit; // out of screen
+    stx := -1; // going left
+    x0 := -x0;
+    x1 := -x1;
+    wx0 := -wx0;
+    wx1 := -wx1;
+    swapInt(wx0, wx1);
+  end;
+
+  // vertical setup
+  if (y0 < y1) then
+  begin
+    // from top to bottom
+    if (y0 > wy1) or (y1 < wy0) then exit; // out of screen
+    sty := 1; // going down
+  end
+  else
+  begin
+    // from bottom to top
+    if (y1 > wy1) or (y0 < wy0) then exit; // out of screen
+    sty := -1; // going up
+    y0 := -y0;
+    y1 := -y1;
+    wy0 := -wy0;
+    wy1 := -wy1;
+    swapInt(wy0, wy1);
+  end;
+
+  dsx := x1-x0;
+  dsy := y1-y0;
+
+  if (dsx < dsy) then
+  begin
+    d0 := @yd;
+    d1 := @xd;
+    swapInt(x0, y0);
+    swapInt(x1, y1);
+    swapInt(dsx, dsy);
+    swapInt(wx0, wy0);
+    swapInt(wx1, wy1);
+    swapInt(stx, sty);
+  end
+  else
+  begin
+    d0 := @xd;
+    d1 := @yd;
+  end;
+
+  dx2 := 2*dsx;
+  dy2 := 2*dsy;
+  xd := x0;
+  yd := y0;
+  e := 2*dsy-dsx;
+  //!term := x1;
+
+  xfixed := false;
+  if (y0 < wy0) then
+  begin
+    // clip at top
+    temp := dx2*(wy0-y0)-dsx;
+    xd += temp div dy2;
+    rem := temp mod dy2;
+    if (xd > wx1) then exit; // x is moved out of clipping rect, nothing to do
+    if (xd+1 >= wx0) then
+    begin
+      yd := wy0;
+      e -= rem+dsx;
+      if (rem > 0) then begin Inc(xd); e += dy2; end;
+      xfixed := true;
+    end;
+  end;
+
+  if (not xfixed) and (x0 < wx0) then
+  begin
+    // clip at left
+    temp := dy2*(wx0-x0);
+    yd += temp div dx2;
+    rem := temp mod dx2;
+    if (yd > wy1) or (yd = wy1) and (rem >= dsx) then exit;
+    xd := wx0;
+    e += rem;
+    if (rem >= dsx) then begin Inc(yd); e -= dx2; end;
+  end;
+
+  (*
+  if (y1 > wy1) then
+  begin
+    // clip at bottom
+    temp := dx2*(wy1-y0)+dsx;
+    term := x0+temp div dy2;
+    rem := temp mod dy2;
+    if (rem = 0) then Dec(term);
+  end;
+
+  if (term > wx1) then term := wx1; // clip at right
+
+  Inc(term); // draw last point
+  //if (term = xd) then exit; // this is the only point, get out of here
+  *)
+
+  if (sty = -1) then yd := -yd;
+  if (stx = -1) then begin xd := -xd; {!term := -term;} end;
+  //!dx2 -= dy2;
+
+  inx := d0^;
+  iny := d1^;
+  result := true;
+end;
 
 
 // ////////////////////////////////////////////////////////////////////////// //
-constructor TBodyProxy.Create (aGrid: TBodyGrid; aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
+procedure TBodyGridBase.TBodyProxyRec.setup (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer);
 begin
   mX := aX;
   mY := aY;
@@ -106,57 +372,68 @@ begin
   mHeight := aHeight;
   mQueryMark := 0;
   mObj := aObj;
-  mGrid := aGrid;
   mTag := aTag;
-end;
-
-destructor TBodyProxy.Destroy ();
-begin
+  nextLink := -1;
 end;
 
 
 // ////////////////////////////////////////////////////////////////////////// //
-constructor TBodyGrid.Create (aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
+constructor TBodyGridBase.Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer{; aTileSize: Integer=GridDefaultTileSize});
 var
   idx: Integer;
 begin
+  dbgShowTraceLog := false;
+  {$IF DEFINED(D2F_DEBUG)}
+  dbgRayTraceTileHitCB := nil;
+  {$ENDIF}
+  {
   if aTileSize < 1 then aTileSize := 1;
   if aTileSize > 8192 then aTileSize := 8192; // arbitrary limit
-  if aPixWidth < aTileSize then aPixWidth := aTileSize;
-  if aPixHeight < aTileSize then aPixHeight := aTileSize;
   mTileSize := aTileSize;
-  mWidth := (aPixWidth+aTileSize-1) div aTileSize;
-  mHeight := (aPixHeight+aTileSize-1) div aTileSize;
+  }
+  if (aPixWidth < mTileSize) then aPixWidth := mTileSize;
+  if (aPixHeight < mTileSize) then aPixHeight := mTileSize;
+  mMinX := aMinPixX;
+  mMinY := aMinPixY;
+  mWidth := (aPixWidth+mTileSize-1) div mTileSize;
+  mHeight := (aPixHeight+mTileSize-1) div mTileSize;
   SetLength(mGrid, mWidth*mHeight);
   SetLength(mCells, mWidth*mHeight);
+  SetLength(mProxies, 8192);
   mFreeCell := 0;
   // init free list
   for idx := 0 to High(mCells) do
   begin
-    mCells[idx].body := nil;
+    mCells[idx].bodies[0] := -1;
+    mCells[idx].bodies[GridCellBucketSize-1] := -1; // "has free room" flag
     mCells[idx].next := idx+1;
   end;
   mCells[High(mCells)].next := -1; // last cell
   // init grid
   for idx := 0 to High(mGrid) do mGrid[idx] := -1;
+  // init proxies
+  for idx := 0 to High(mProxies) do mProxies[idx].nextLink := idx+1;
+  mProxies[High(mProxies)].nextLink := -1;
   mLastQuery := 0;
   mUsedCells := 0;
+  mProxyFree := 0;
+  mProxyCount := 0;
+  mProxyMaxCount := 0;
   e_WriteLog(Format('created grid with size: %dx%d (tile size: %d); pix: %dx%d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize]), MSG_NOTIFY);
 end;
 
 
-destructor TBodyGrid.Destroy ();
-var
-  idx: Integer;
+destructor TBodyGridBase.Destroy ();
 begin
-  // free all owned proxies
-  for idx := 0 to High(mCells) do mCells[idx].body.Free;
   mCells := nil;
   mGrid := nil;
+  mProxies := nil;
+  inherited;
 end;
 
 
-procedure TBodyGrid.dumpStats ();
+// ////////////////////////////////////////////////////////////////////////// //
+procedure TBodyGridBase.dumpStats ();
 var
   idx, mcb, cidx, cnt: Integer;
 begin
@@ -172,228 +449,1743 @@ begin
     end;
     if (mcb < cnt) then mcb := cnt;
   end;
-  e_WriteLog(Format('grid size: %dx%d (tile size: %d); pix: %dx%d; used cells: %d; max bodys in cell: %d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize, mUsedCells, mcb]), MSG_NOTIFY);
+  e_WriteLog(Format('grid size: %dx%d (tile size: %d); pix: %dx%d; used cells: %d; max bodies in cell: %d; max proxies allocated: %d; proxies used: %d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize, mUsedCells, mcb, mProxyMaxCount, mProxyCount]), MSG_NOTIFY);
+end;
+
+
+procedure TBodyGridBase.forEachBodyCell (body: TBodyProxyId; cb: TCellQueryCB);
+var
+  g, f, cidx: Integer;
+  cc: PGridCell;
+begin
+  if (body < 0) or (body > High(mProxies)) or not assigned(cb) then exit;
+  for g := 0 to High(mGrid) do
+  begin
+    cidx := mGrid[g];
+    while (cidx <> -1) do
+    begin
+      cc := @mCells[cidx];
+      for f := 0 to GridCellBucketSize-1 do
+      begin
+        if (cc.bodies[f] = -1) then break;
+        if (cc.bodies[f] = body) then cb((g mod mWidth)*mTileSize+mMinX, (g div mWidth)*mTileSize+mMinY);
+      end;
+      // next cell
+      cidx := cc.next;
+    end;
+  end;
+end;
+
+
+function TBodyGridBase.forEachInCell (x, y: Integer; cb: TGridQueryCB): ITP;
+var
+  f, cidx: Integer;
+  cc: PGridCell;
+begin
+  result := Default(ITP);
+  if not assigned(cb) then exit;
+  Dec(x, mMinX);
+  Dec(y, mMinY);
+  if (x < 0) or (y < 0) or (x >= mWidth*mTileSize) or (y > mHeight*mTileSize) then exit;
+  cidx := mGrid[(y div mTileSize)*mWidth+(x div mTileSize)];
+  while (cidx <> -1) do
+  begin
+    cc := @mCells[cidx];
+    for f := 0 to GridCellBucketSize-1 do
+    begin
+      if (cc.bodies[f] = -1) then break;
+      if cb(mProxies[cc.bodies[f]].mObj, mProxies[cc.bodies[f]].mTag) then begin result := mProxies[cc.bodies[f]].mObj; exit; end;
+    end;
+    // next cell
+    cidx := cc.next;
+  end;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.getGridWidthPx (): Integer; inline; begin result := mWidth*mTileSize; end;
+function TBodyGridBase.getGridHeightPx (): Integer; inline; begin result := mHeight*mTileSize; end;
+
+
+function TBodyGridBase.insideGrid (x, y: Integer): Boolean; inline;
+begin
+  // fix coords
+  Dec(x, mMinX);
+  Dec(y, mMinY);
+  result := (x >= 0) and (y >= 0) and (x < mWidth*mTileSize) and (y < mHeight*mTileSize);
+end;
+
+
+function TBodyGridBase.getBodyXY (body: TBodyProxyId; out rx, ry: Integer): Boolean; inline;
+begin
+  if (body >= 0) and (body < Length(mProxies)) then
+  begin
+    with mProxies[body] do begin rx := mX; ry := mY; end;
+    result := true;
+  end
+  else
+  begin
+    rx := 0;
+    ry := 0;
+    result := false;
+  end;
+end;
+
+
+function TBodyGridBase.getBodyWH (body: TBodyProxyId; out rw, rh: Integer): Boolean; inline;
+begin
+  if (body >= 0) and (body < Length(mProxies)) then
+  begin
+    with mProxies[body] do begin rw := mWidth; rh := mHeight; end;
+    result := true;
+  end
+  else
+  begin
+    rw := 0;
+    rh := 0;
+    result := false;
+  end;
+end;
+
+
+function TBodyGridBase.getBodyDims (body: TBodyProxyId; out rx, ry, rw, rh: Integer): Boolean; inline;
+begin
+  if (body >= 0) and (body < Length(mProxies)) then
+  begin
+    with mProxies[body] do begin rx := mX; ry := mY; rw := mWidth; rh := mHeight; end;
+    result := true;
+  end
+  else
+  begin
+    rx := 0;
+    ry := 0;
+    rw := 0;
+    rh := 0;
+    result := false;
+  end;
+end;
+
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.getProxyEnabled (pid: TBodyProxyId): Boolean; inline;
+begin
+  if (pid >= 0) then result := ((mProxies[pid].mTag and TagDisabled) = 0) else result := false;
+end;
+
+
+procedure TBodyGridBase.setProxyEnabled (pid: TBodyProxyId; val: Boolean); inline;
+begin
+  if (pid >= 0) then
+  begin
+    if val then
+    begin
+      mProxies[pid].mTag := mProxies[pid].mTag and not TagDisabled;
+    end
+    else
+    begin
+      mProxies[pid].mTag := mProxies[pid].mTag or TagDisabled;
+    end;
+  end;
 end;
 
 
-function TBodyGrid.allocCell: Integer;
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.allocCell (): Integer;
 var
   idx: Integer;
+  pc: PGridCell;
 begin
   if (mFreeCell < 0) then
   begin
     // no free cells, want more
     mFreeCell := Length(mCells);
-    SetLength(mCells, mFreeCell+16384); // arbitrary number
+    SetLength(mCells, mFreeCell+32768); // arbitrary number
     for idx := mFreeCell to High(mCells) do
     begin
-      mCells[idx].body := nil;
+      mCells[idx].bodies[0] := -1;
+      mCells[idx].bodies[GridCellBucketSize-1] := -1; // 'has free room' flag
       mCells[idx].next := idx+1;
     end;
     mCells[High(mCells)].next := -1; // last cell
   end;
   result := mFreeCell;
-  mFreeCell := mCells[result].next;
-  mCells[result].next := -1;
+  pc := @mCells[result];
+  mFreeCell := pc.next;
+  pc.next := -1;
   Inc(mUsedCells);
   //e_WriteLog(Format('grid: allocated new cell #%d (total: %d)', [result, mUsedCells]), MSG_NOTIFY);
 end;
 
 
-procedure TBodyGrid.freeCell (idx: Integer);
+procedure TBodyGridBase.freeCell (idx: Integer);
 begin
-  if (idx >= 0) and (idx < High(mCells)) then
+  if (idx >= 0) and (idx < Length(mCells)) then
   begin
-    if mCells[idx].body = nil then exit; // the thing that should not be
-    mCells[idx].body := nil;
-    mCells[idx].next := mFreeCell;
+    with mCells[idx] do
+    begin
+      bodies[0] := -1;
+      bodies[GridCellBucketSize-1] := -1; // 'has free room' flag
+      next := mFreeCell;
+    end;
     mFreeCell := idx;
     Dec(mUsedCells);
   end;
 end;
 
 
-procedure TBodyGrid.insert (body: TBodyProxy);
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.allocProxy (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer): TBodyProxyId;
+var
+  olen, idx: Integer;
+  px: PBodyProxyRec;
+begin
+  if (mProxyFree = -1) then
+  begin
+    // no free proxies, resize list
+    olen := Length(mProxies);
+    SetLength(mProxies, olen+8192); // arbitrary number
+    for idx := olen to High(mProxies) do mProxies[idx].nextLink := idx+1;
+    mProxies[High(mProxies)].nextLink := -1;
+    mProxyFree := olen;
+  end;
+  // get one from list
+  result := mProxyFree;
+  px := @mProxies[result];
+  mProxyFree := px.nextLink;
+  px.setup(aX, aY, aWidth, aHeight, aObj, aTag);
+  // add to used list
+  px.nextLink := -1;
+  // statistics
+  Inc(mProxyCount);
+  if (mProxyMaxCount < mProxyCount) then mProxyMaxCount := mProxyCount;
+end;
+
+procedure TBodyGridBase.freeProxy (body: TBodyProxyId);
+begin
+  if (body < 0) or (body > High(mProxies)) then exit; // just in case
+  if (mProxyCount = 0) then raise Exception.Create('wutafuuuuu in grid (no allocated proxies, what i should free now?)');
+  // add to free list
+  mProxies[body].mObj := nil;
+  mProxies[body].nextLink := mProxyFree;
+  mProxyFree := body;
+  Dec(mProxyCount);
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.forGridRect (x, y, w, h: Integer; cb: TGridInternalCB; bodyId: TBodyProxyId): Boolean;
+const
+  tsize = mTileSize;
 var
-  dx, dy, gx, gy, cidx: Integer;
-begin
-  if body = nil then exit;
-  if (body.mWidth < 1) or (body.mHeight < 1) then exit;
-  // out of grid?
-  if (body.mX+body.mWidth <= 0) or (body.mY+body.mHeight <= 0) then exit;
-  if (body.mX >= mWidth*mTileSize) or (body.mY >= mHeight*mTileSize) then exit;
-  //e_WriteLog(Format('grid: inserting body: (%d,%d)-(%dx%d)', [body.mX, body.mY, body.mWidth, body.mHeight]), MSG_NOTIFY);
-  gy := body.mY div mTileSize;
-  dy := 0;
-  while (dy < body.mHeight) do
-  begin
-    if (gy >= 0) and (gy < mHeight) then
+  gx, gy: Integer;
+  gw, gh: Integer;
+begin
+  result := false;
+  if (w < 1) or (h < 1) or not assigned(cb) then exit;
+  // fix coords
+  Dec(x, mMinX);
+  Dec(y, mMinY);
+  // go on
+  if (x+w <= 0) or (y+h <= 0) then exit;
+  gw := mWidth;
+  gh := mHeight;
+  //tsize := mTileSize;
+  if (x >= gw*tsize) or (y >= gh*tsize) then exit;
+  for gy := y div tsize to (y+h-1) div tsize do
+  begin
+    if (gy < 0) then continue;
+    if (gy >= gh) then break;
+    for gx := x div tsize to (x+w-1) div tsize do
     begin
-      dx := 0;
-      gx := body.mX div mTileSize;
-      while (dx < body.mWidth) do
-      begin
-        if (gx >= 0) and (gx < mWidth) then
-        begin
-          //e_WriteLog(Format('  00: allocating cell for grid coords (%d,%d), body coords:(%d,%d)', [gx, gy, dx, dy]), MSG_NOTIFY);
-          cidx := allocCell();
-          //e_WriteLog(Format('  01: allocated cell for grid coords (%d,%d), body coords:(%d,%d): #%d', [gx, gy, dx, dy, cidx]), MSG_NOTIFY);
-          mCells[cidx].body := body;
-          mCells[cidx].next := mGrid[gy*mWidth+gx];
-          mGrid[gy*mWidth+gx] := cidx;
-          //e_WriteLog(Format('  02: put cell for grid coords (%d,%d), body coords:(%d,%d): #%d', [gx, gy, dx, dy, cidx]), MSG_NOTIFY);
-        end;
-        Inc(dx, mTileSize);
-        Inc(gx);
-      end;
+      if (gx < 0) then continue;
+      if (gx >= gw) then break;
+      result := cb(gy*gw+gx, bodyId);
+      if result then exit;
     end;
-    Inc(dy, mTileSize);
-    Inc(gy);
   end;
 end;
 
 
-// absolutely not tested
-procedure TBodyGrid.remove (body: TBodyProxy);
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.inserter (grida: Integer; bodyId: TBodyProxyId): Boolean;
 var
-  dx, dy, gx, gy, idx, pidx, tmp: Integer;
-begin
-  if body = nil then exit;
-  if (body.mWidth < 1) or (body.mHeight < 1) then exit;
-  // out of grid?
-  if (body.mX+body.mWidth <= 0) or (body.mY+body.mHeight <= 0) then exit;
-  if (body.mX >= mWidth*mTileSize) or (body.mY >= mHeight*mTileSize) then exit;
-  gy := body.mY div mTileSize;
-  dy := 0;
-  pidx := -1;
-  while (dy < body.mHeight) do
-  begin
-    if (gy >= 0) and (gy < mHeight) then
+  cidx: Integer;
+  pc: Integer;
+  pi: PGridCell;
+  f: Integer;
+begin
+  result := false; // never stop
+  // add body to the given grid cell
+  pc := mGrid[grida];
+  if (pc <> -1) then
+  begin
+    {$IF DEFINED(D2F_DEBUG)}
+    cidx := pc;
+    while (cidx <> -1) do
+    begin
+      pi := @mCells[cidx];
+      for f := 0 to GridCellBucketSize-1 do
+      begin
+        if (pi.bodies[f] = -1) then break;
+        if (pi.bodies[f] = bodyId) then raise Exception.Create('trying to insert already inserted proxy');
+      end;
+      cidx := pi.next;
+    end;
+    {$ENDIF}
+    cidx := pc;
+    while (cidx <> -1) do
     begin
-      dx := 0;
-      gx := body.mX div mTileSize;
-      while (dx < body.mWidth) do
+      pi := @mCells[cidx];
+      // check "has room" flag
+      if (pi.bodies[GridCellBucketSize-1] = -1) then
       begin
-        if (gx >= 0) and (gx < mWidth) then
+        // can add here
+        for f := 0 to GridCellBucketSize-1 do
         begin
-          // find and remove cell
-          pidx := -1;
-          idx := mGrid[gy*mWidth+gx];
-          while idx >= 0 do
+          if (pi.bodies[f] = -1) then
           begin
-            tmp := mCells[idx].next;
-            if mCells[idx].body = body then
-            begin
-              if pidx = -1 then mGrid[gy*mWidth+gx] := tmp else mCells[pidx].next := tmp;
-              freeCell(idx);
-            end
-            else
-            begin
-              pidx := idx;
-            end;
-            idx := tmp;
+            pi.bodies[f] := bodyId;
+            if (f+1 < GridCellBucketSize) then pi.bodies[f+1] := -1;
+            exit;
           end;
         end;
-        Inc(dx, mTileSize);
-        Inc(gx);
+        raise Exception.Create('internal error in grid inserter');
       end;
+      // no room, go to next cell in list (if there is any)
+      cidx := pi.next;
     end;
-    Inc(dy, mTileSize);
-    Inc(gy);
+    // no room in cells, add new cell to list
   end;
+  // either no room, or no cell at all
+  cidx := allocCell();
+  pi := @mCells[cidx];
+  pi.bodies[0] := bodyId;
+  pi.bodies[1] := -1;
+  pi.next := pc;
+  mGrid[grida] := cidx;
 end;
 
-
-function TBodyGrid.insertBody (aObj: TObject; aX, aY, aWidth, aHeight: Integer; aTag: Integer=0): TBodyProxy;
+procedure TBodyGridBase.insertInternal (body: TBodyProxyId);
+var
+  px: PBodyProxyRec;
 begin
-  result := nil;
-  if aObj = nil then exit;
-  result := TBodyProxy.Create(self, aX, aY, aWidth, aHeight, aObj, aTag);
-  insert(result);
+  if (body < 0) or (body > High(mProxies)) then exit; // just in case
+  px := @mProxies[body];
+  forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, inserter, body);
 end;
 
 
-procedure TBodyGrid.moveResizeBody (body: TBodyProxy; dx, dy, sx, sy: Integer);
+// assume that we cannot have one object added to bucket twice
+function TBodyGridBase.remover (grida: Integer; bodyId: TBodyProxyId): Boolean;
+var
+  f, c: Integer;
+  pidx, cidx: Integer;
+  pc: PGridCell;
+begin
+  result := false; // never stop
+  // find and remove cell
+  pidx := -1; // previous cell index
+  cidx := mGrid[grida]; // current cell index
+  while (cidx <> -1) do
+  begin
+    pc := @mCells[cidx];
+    for f := 0 to GridCellBucketSize-1 do
+    begin
+      if (pc.bodies[f] = bodyId) then
+      begin
+        // i found her!
+        if (f = 0) and (pc.bodies[1] = -1) then
+        begin
+          // this cell contains no elements, remove it
+          if (pidx = -1) then mGrid[grida] := pc.next else mCells[pidx].next := pc.next;
+          freeCell(cidx);
+          exit;
+        end;
+        // remove element from bucket
+        for c := f to GridCellBucketSize-2 do
+        begin
+          pc.bodies[c] := pc.bodies[c+1];
+          if (pc.bodies[c] = -1) then break;
+        end;
+        pc.bodies[GridCellBucketSize-1] := -1; // "has free room" flag
+        exit;
+      end;
+    end;
+    pidx := cidx;
+    cidx := pc.next;
+  end;
+end;
+
+procedure TBodyGridBase.removeInternal (body: TBodyProxyId);
+var
+  px: PBodyProxyRec;
 begin
-  if (body = nil) or ((dx = 0) and (dy = 0) and (sx = 0) and (sy = 0)) then exit;
-  remove(body);
-  Inc(body.mX, dx);
-  Inc(body.mY, dy);
-  Inc(body.mWidth, sx);
-  Inc(body.mHeight, sy);
-  insert(body);
+  if (body < 0) or (body > High(mProxies)) then exit; // just in case
+  px := @mProxies[body];
+  forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover, body);
 end;
 
-procedure TBodyGrid.moveBody (body: TBodyProxy; dx, dy: Integer);
+
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.insertBody (aObj: ITP; aX, aY, aWidth, aHeight: Integer; aTag: Integer=-1): TBodyProxyId;
 begin
-  moveResizeBody(body, dx, dy, 0, 0);
+  aTag := aTag and TagFullMask;
+  result := allocProxy(aX, aY, aWidth, aHeight, aObj, aTag);
+  insertInternal(result);
 end;
 
-procedure TBodyGrid.resizeBody (body: TBodyProxy; sx, sy: Integer);
+
+procedure TBodyGridBase.removeBody (body: TBodyProxyId);
 begin
-  moveResizeBody(body, 0, 0, sx, sy);
+  if (body < 0) or (body > High(mProxies)) then exit; // just in case
+  removeInternal(body);
+  freeProxy(body);
 end;
 
 
-function TBodyGrid.forEachInAABB (x, y, w, h: Integer; cb: GridQueryCB): Boolean;
+// ////////////////////////////////////////////////////////////////////////// //
+procedure TBodyGridBase.moveResizeBody (body: TBodyProxyId; nx, ny, nw, nh: Integer);
 var
-  gx, gy, idx: Integer;
-  minx, miny, maxx, maxy: Integer;
+  px: PBodyProxyRec;
+  x0, y0, w, h: Integer;
 begin
-  result := false;
-  if not assigned(cb) then exit;
-  if (w < 1) or (h < 1) then exit;
-  minx := x;
-  miny := y;
-  maxx := x+w-1;
-  maxy := y+h-1;
-  if (minx > maxx) or (miny > maxy) then exit;
-  if (maxx < 0) or (maxy < 0) then exit;
-  if (minx >= mWidth*mTileSize) or (miny >= mHeight*mTileSize) then exit;
-  // increase query counter
-  Inc(mLastQuery);
-  if (mLastQuery = 0) then
+  if (body < 0) or (body > High(mProxies)) then exit; // just in case
+  px := @mProxies[body];
+  x0 := px.mX;
+  y0 := px.mY;
+  w := px.mWidth;
+  h := px.mHeight;
+  {$IF DEFINED(D2F_DEBUG_MOVER)}
+  e_WriteLog(Format('proxy #%d: MOVERESIZE: xg=%d;yg=%d;w=%d;h=%d;nx=%d;ny=%d;nw=%d;nh=%d', [body, x0-mMinX, y0-mMinY, w, h, nx-mMinX, ny-mMinY, nw, nh]), MSG_NOTIFY);
+  {$ENDIF}
+  if (nx = x0) and (ny = y0) and (nw = w) and (nh = h) then exit;
+  // map -> grid
+  Dec(x0, mMinX);
+  Dec(y0, mMinY);
+  Dec(nx, mMinX);
+  Dec(ny, mMinY);
+  // did any corner crossed tile boundary?
+  if (x0 div mTileSize <> nx div mTileSize) or
+     (y0 div mTileSize <> ny div mTileSize) or
+     ((x0+w) div mTileSize <> (nx+nw) div mTileSize) or
+     ((y0+h) div mTileSize <> (ny+nh) div mTileSize) then
   begin
-    // just in case of overflow
-    mLastQuery := 1;
-    for idx := 0 to High(mCells) do if (mCells[idx].body <> nil) then mCells[idx].body.mQueryMark := 0;
+    removeInternal(body);
+    px.mX := nx+mMinX;
+    px.mY := ny+mMinY;
+    px.mWidth := nw;
+    px.mHeight := nh;
+    insertInternal(body);
+  end
+  else
+  begin
+    px.mX := nx+mMinX;
+    px.mY := ny+mMinY;
+    px.mWidth := nw;
+    px.mHeight := nh;
   end;
-  //e_WriteLog(Format('grid: query #%d: (%d,%d)-(%dx%d)', [mLastQuery, minx, miny, maxx, maxy]), MSG_NOTIFY);
-  // process grid
-  for gy := miny div mTileSize to maxy div mTileSize do
+end;
+
+//TODO: optimize for horizontal/vertical moves
+procedure TBodyGridBase.moveBody (body: TBodyProxyId; nx, ny: Integer);
+var
+  px: PBodyProxyRec;
+  x0, y0: Integer;
+  ogx0, ogx1, ogy0, ogy1: Integer; // old grid rect
+  ngx0, ngx1, ngy0, ngy1: Integer; // new grid rect
+  gx, gy: Integer;
+  gw, gh: Integer;
+  pw, ph: Integer;
+begin
+  if (body < 0) or (body > High(mProxies)) then exit; // just in case
+  // check if tile coords was changed
+  px := @mProxies[body];
+  x0 := px.mX;
+  y0 := px.mY;
+  if (nx = x0) and (ny = y0) then exit;
+  // map -> grid
+  Dec(x0, mMinX);
+  Dec(y0, mMinY);
+  Dec(nx, mMinX);
+  Dec(ny, mMinY);
+  // check for heavy work
+  pw := px.mWidth;
+  ph := px.mHeight;
+  ogx0 := x0 div mTileSize;
+  ogy0 := y0 div mTileSize;
+  ngx0 := nx div mTileSize;
+  ngy0 := ny div mTileSize;
+  ogx1 := (x0+pw-1) div mTileSize;
+  ogy1 := (y0+ph-1) div mTileSize;
+  ngx1 := (nx+pw-1) div mTileSize;
+  ngy1 := (ny+ph-1) div mTileSize;
+  {$IF DEFINED(D2F_DEBUG_MOVER)}
+  e_WriteLog(Format('proxy #%d: checkmove: xg=%d;yg=%d;w=%d;h=%d;nx=%d;ny=%d og:(%d,%d)-(%d,%d); ng:(%d,%d)-(%d,%d)', [body, x0, y0, pw, ph, nx, ny, ogx0, ogy0, ogx1, ogy1, ngx0, ngy0, ngx1, ngy1]), MSG_NOTIFY);
+  {$ENDIF}
+  if (ogx0 <> ngx0) or (ogy0 <> ngy0) or (ogx1 <> ngx1) or (ogy1 <> ngy1) then
   begin
-    if (gy < 0) then continue;
-    if (gy >= mHeight) then break;
-    for gx := minx div mTileSize to maxx div mTileSize do
+    // crossed tile boundary, do heavy work
+    gw := mWidth;
+    gh := mHeight;
+    // cycle with old rect, remove body where it is necessary
+    // optimized for horizontal moves
+    {$IF DEFINED(D2F_DEBUG_MOVER)}
+    e_WriteLog(Format('proxy #%d: xg=%d;yg=%d;w=%d;h=%d;nx=%d;ny=%d og:(%d,%d)-(%d,%d); ng:(%d,%d)-(%d,%d)', [body, x0, y0, pw, ph, nx, ny, ogx0, ogy0, ogx1, ogy1, ngx0, ngy0, ngx1, ngy1]), MSG_NOTIFY);
+    {$ENDIF}
+    // remove stale marks
+    if not ((ogy0 >= gh) or (ogy1 < 0)) and
+       not ((ogx0 >= gw) or (ogx1 < 0)) then
     begin
-      if (gx < 0) then continue;
-      if (gx >= mWidth) then break;
-      idx := mGrid[gy*mWidth+gx];
-      while idx >= 0 do
+      if (ogx0 < 0) then ogx0 := 0;
+      if (ogy0 < 0) then ogy0 := 0;
+      if (ogx1 > gw-1) then ogx1 := gw-1;
+      if (ogy1 > gh-1) then ogy1 := gh-1;
+      {$IF DEFINED(D2F_DEBUG_MOVER)}
+      e_WriteLog(Format(' norm og:(%d,%d)-(%d,%d)', [ogx0, ogy0, ogx1, ogy1]), MSG_NOTIFY);
+      {$ENDIF}
+      for gx := ogx0 to ogx1 do
+      begin
+        if (gx < ngx0) or (gx > ngx1) then
+        begin
+          // this column is completely outside of new rect
+          for gy := ogy0 to ogy1 do
+          begin
+            {$IF DEFINED(D2F_DEBUG_MOVER)}
+            e_WriteLog(Format('  remove0:(%d,%d)', [gx, gy]), MSG_NOTIFY);
+            {$ENDIF}
+            remover(gy*gw+gx, body);
+          end;
+        end
+        else
+        begin
+          // heavy checks
+          for gy := ogy0 to ogy1 do
+          begin
+            if (gy < ngy0) or (gy > ngy1) then
+            begin
+              {$IF DEFINED(D2F_DEBUG_MOVER)}
+              e_WriteLog(Format('  remove1:(%d,%d)', [gx, gy]), MSG_NOTIFY);
+              {$ENDIF}
+              remover(gy*gw+gx, body);
+            end;
+          end;
+        end;
+      end;
+    end;
+    // cycle with new rect, add body where it is necessary
+    if not ((ngy0 >= gh) or (ngy1 < 0)) and
+       not ((ngx0 >= gw) or (ngx1 < 0)) then
+    begin
+      if (ngx0 < 0) then ngx0 := 0;
+      if (ngy0 < 0) then ngy0 := 0;
+      if (ngx1 > gw-1) then ngx1 := gw-1;
+      if (ngy1 > gh-1) then ngy1 := gh-1;
+      {$IF DEFINED(D2F_DEBUG_MOVER)}
+      e_WriteLog(Format(' norm ng:(%d,%d)-(%d,%d)', [ngx0, ngy0, ngx1, ngy1]), MSG_NOTIFY);
+      {$ENDIF}
+      for gx := ngx0 to ngx1 do
       begin
-        if (mCells[idx].body <> nil) and (mCells[idx].body.mQueryMark <> mLastQuery) then
+        if (gx < ogx0) or (gx > ogx1) then
         begin
-          //e_WriteLog(Format('  query #%d body hit: (%d,%d)-(%dx%d) tag:%d', [mLastQuery, mCells[idx].body.mX, mCells[idx].body.mY, mCells[idx].body.mWidth, mCells[idx].body.mHeight, mCells[idx].body.mTag]), MSG_NOTIFY);
-          mCells[idx].body.mQueryMark := mLastQuery;
-          if (cb(mCells[idx].body.mObj, mCells[idx].body.mTag)) then begin result := true; exit; end;
+          // this column is completely outside of old rect
+          for gy := ngy0 to ngy1 do
+          begin
+            {$IF DEFINED(D2F_DEBUG_MOVER)}
+            e_WriteLog(Format('  insert0:(%d,%d)', [gx, gy]), MSG_NOTIFY);
+            {$ENDIF}
+            inserter(gy*gw+gx, body);
+          end;
+        end
+        else
+        begin
+          // heavy checks
+          for gy := ngy0 to ngy1 do
+          begin
+            if (gy < ogy0) or (gy > ogy1) then
+            begin
+              {$IF DEFINED(D2F_DEBUG_MOVER)}
+              e_WriteLog(Format('  insert1:(%d,%d)', [gx, gy]), MSG_NOTIFY);
+              {$ENDIF}
+              inserter(gy*gw+gx, body);
+            end;
+          end;
         end;
-        idx := mCells[idx].next;
       end;
     end;
+    // done
+  end
+  else
+  begin
+    {$IF DEFINED(D2F_DEBUG_MOVER)}
+    e_WriteLog(Format('proxy #%d: GRID OK: xg=%d;yg=%d;w=%d;h=%d;nx=%d;ny=%d og:(%d,%d)-(%d,%d); ng:(%d,%d)-(%d,%d)', [body, x0, y0, pw, ph, nx, ny, ogx0, ogy0, ogx1, ogy1, ngx0, ngy0, ngx1, ngy1]), MSG_NOTIFY);
+    {$ENDIF}
   end;
+  // update coordinates
+  px.mX := nx+mMinX;
+  px.mY := ny+mMinY;
 end;
 
-
-function TBodyGrid.getProxyForBody (aObj: TObject; x, y, w, h: Integer): TBodyProxy;
-
-  function qq (obj: TObject; tag: Integer): Boolean;
+procedure TBodyGridBase.resizeBody (body: TBodyProxyId; nw, nh: Integer);
+var
+  px: PBodyProxyRec;
+  x0, y0, w, h: Integer;
+begin
+  if (body < 0) or (body > High(mProxies)) then exit; // just in case
+  // check if tile coords was changed
+  px := @mProxies[body];
+  x0 := px.mX-mMinX;
+  y0 := px.mY-mMinY;
+  w := px.mWidth;
+  h := px.mHeight;
+  {$IF DEFINED(D2F_DEBUG_MOVER)}
+  e_WriteLog(Format('proxy #%d: RESIZE: xg=%d;yg=%d;w=%d;h=%d;nw=%d;nh=%d', [body, x0, y0, w, h, nw, nh]), MSG_NOTIFY);
+  {$ENDIF}
+  if ((x0+w) div mTileSize <> (x0+nw) div mTileSize) or
+     ((y0+h) div mTileSize <> (y0+nh) div mTileSize) then
   begin
-    result := (obj = aObj);
+    // crossed tile boundary, do heavy work
+    removeInternal(body);
+    px.mWidth := nw;
+    px.mHeight := nh;
+    insertInternal(body);
+  end
+  else
+  begin
+    // nothing to do with the grid, just fix size
+    px.mWidth := nw;
+    px.mHeight := nh;
   end;
-
-begin
-  result := nil;
-  forEachInAABB(x, y, w, h, qq);
 end;
 
+
+// ////////////////////////////////////////////////////////////////////////// //
+// no callback: return `true` on the first hit
+function TBodyGridBase.forEachAtPoint (x, y: Integer; cb: TGridQueryCB; tagmask: Integer=-1; exittag: PInteger=nil): ITP;
+var
+  f: Integer;
+  idx, curci: Integer;
+  cc: PGridCell = nil;
+  px: PBodyProxyRec;
+  lq: LongWord;
+  ptag: Integer;
+begin
+  result := Default(ITP);
+  if (exittag <> nil) then exittag^ := 0;
+  tagmask := tagmask and TagFullMask;
+  if (tagmask = 0) then exit;
+
+  {$IF DEFINED(D2F_DEBUG_XXQ)}
+  if (assigned(cb)) then e_WriteLog(Format('0: grid pointquery: (%d,%d)', [x, y]), MSG_NOTIFY);
+  {$ENDIF}
+
+  // make coords (0,0)-based
+  Dec(x, mMinX);
+  Dec(y, mMinY);
+  if (x < 0) or (y < 0) or (x >= mWidth*mTileSize) or (y >= mHeight*mTileSize) then exit;
+
+  curci := mGrid[(y div mTileSize)*mWidth+(x div mTileSize)];
+
+  {$IF DEFINED(D2F_DEBUG_XXQ)}
+  if (assigned(cb)) then e_WriteLog(Format('1: grid pointquery: (%d,%d) (%d,%d) %d', [x, y, (x div mTileSize), (y div mTileSize), curci]), MSG_NOTIFY);
+  {$ENDIF}
+
+  // restore coords
+  Inc(x, mMinX);
+  Inc(y, mMinY);
+
+  // increase query counter
+  Inc(mLastQuery);
+  if (mLastQuery = 0) then
+  begin
+    // just in case of overflow
+    mLastQuery := 1;
+    for idx := 0 to High(mProxies) do mProxies[idx].mQueryMark := 0;
+  end;
+  lq := mLastQuery;
+
+  {$IF DEFINED(D2F_DEBUG_XXQ)}
+  if (assigned(cb)) then e_WriteLog(Format('2: grid pointquery: (%d,%d); lq=%u', [x, y, lq]), MSG_NOTIFY);
+  {$ENDIF}
+
+  while (curci <> -1) do
+  begin
+    {$IF DEFINED(D2F_DEBUG_XXQ)}
+    if (assigned(cb)) then e_WriteLog(Format(' cell #%d', [curci]), MSG_NOTIFY);
+    {$ENDIF}
+    cc := @mCells[curci];
+    for f := 0 to GridCellBucketSize-1 do
+    begin
+      if (cc.bodies[f] = -1) then break;
+      px := @mProxies[cc.bodies[f]];
+      {$IF DEFINED(D2F_DEBUG_XXQ)}
+      if (assigned(cb)) then e_WriteLog(Format('  proxy #%d; qm:%u; tag:%08x; tagflag:%d  %u', [cc.bodies[f], px.mQueryMark, px.mTag, (px.mTag and tagmask), LongWord(px.mObj)]), MSG_NOTIFY);
+      {$ENDIF}
+      // shit. has to do it this way, so i can change tag in callback
+      if (px.mQueryMark <> lq) then
+      begin
+        px.mQueryMark := lq;
+        ptag := px.mTag;
+        if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and
+           (x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight) then
+        begin
+          if assigned(cb) then
+          begin
+            if cb(px.mObj, ptag) then
+            begin
+              result := px.mObj;
+              if (exittag <> nil) then exittag^ := ptag;
+              exit;
+            end;
+          end
+          else
+          begin
+            result := px.mObj;
+            if (exittag <> nil) then exittag^ := ptag;
+            exit;
+          end;
+        end;
+      end;
+    end;
+    curci := cc.next;
+  end;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+// no callback: return `true` on the first hit
+function TBodyGridBase.forEachInAABB (x, y, w, h: Integer; cb: TGridQueryCB; tagmask: Integer=-1; allowDisabled: Boolean=false): ITP;
+const
+  tsize = mTileSize;
+var
+  idx: Integer;
+  gx, gy: Integer;
+  curci: Integer;
+  f: Integer;
+  cc: PGridCell = nil;
+  px: PBodyProxyRec;
+  lq: LongWord;
+  gw: Integer;
+  x0, y0: Integer;
+  ptag: Integer;
+begin
+  result := Default(ITP);
+  if (w < 1) or (h < 1) then exit;
+  tagmask := tagmask and TagFullMask;
+  if (tagmask = 0) then exit;
+
+  x0 := x;
+  y0 := y;
+
+  // fix coords
+  Dec(x, mMinX);
+  Dec(y, mMinY);
+
+  gw := mWidth;
+  //tsize := mTileSize;
+
+  if (x+w <= 0) or (y+h <= 0) then exit;
+  if (x >= gw*tsize) or (y >= mHeight*tsize) then exit;
+
+  // increase query counter
+  Inc(mLastQuery);
+  if (mLastQuery = 0) then
+  begin
+    // just in case of overflow
+    mLastQuery := 1;
+    for idx := 0 to High(mProxies) do mProxies[idx].mQueryMark := 0;
+  end;
+  //e_WriteLog(Format('grid: query #%d: (%d,%d)-(%dx%d)', [mLastQuery, minx, miny, maxx, maxy]), MSG_NOTIFY);
+  lq := mLastQuery;
+
+  // go on
+  for gy := y div tsize to (y+h-1) div tsize do
+  begin
+    if (gy < 0) then continue;
+    if (gy >= mHeight) then break;
+    for gx := x div tsize to (x+w-1) div tsize do
+    begin
+      if (gx < 0) then continue;
+      if (gx >= gw) then break;
+      // process cells
+      curci := mGrid[gy*gw+gx];
+      while (curci <> -1) do
+      begin
+        cc := @mCells[curci];
+        for f := 0 to GridCellBucketSize-1 do
+        begin
+          if (cc.bodies[f] = -1) then break;
+          px := @mProxies[cc.bodies[f]];
+          // shit. has to do it this way, so i can change tag in callback
+          if (px.mQueryMark = lq) then continue;
+          px.mQueryMark := lq;
+          ptag := px.mTag;
+          if (not allowDisabled) and ((ptag and TagDisabled) <> 0) then continue;
+          if ((ptag and tagmask) = 0) then continue;
+          if (x0 >= px.mX+px.mWidth) or (y0 >= px.mY+px.mHeight) then continue;
+          if (x0+w <= px.mX) or (y0+h <= px.mY) then continue;
+          if assigned(cb) then
+          begin
+            if cb(px.mObj, ptag) then begin result := px.mObj; exit; end;
+          end
+          else
+          begin
+            result := px.mObj;
+            exit;
+          end;
+        end;
+        curci := cc.next;
+      end;
+    end;
+  end;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+// no callback: return `true` on the nearest hit
+function TBodyGridBase.traceRay (const x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP;
+var
+  ex, ey: Integer;
+begin
+  result := traceRay(ex, ey, x0, y0, x1, y1, cb, tagmask);
+end;
+
+
+// no callback: return `true` on the nearest hit
+// you are not supposed to understand this
+function TBodyGridBase.traceRay (out ex, ey: Integer; const ax0, ay0, ax1, ay1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP;
+const
+  tsize = mTileSize;
+var
+  wx0, wy0, wx1, wy1: Integer; // window coordinates
+  stx, sty: Integer; // "steps" for x and y axes
+  dsx, dsy: Integer; // "lengthes" for x and y axes
+  dx2, dy2: Integer; // "double lengthes" for x and y axes
+  xd, yd: Integer; // current coord
+  e: Integer; // "error" (as in bresenham algo)
+  rem: Integer;
+  term: Integer;
+  xptr, yptr: PInteger;
+  xfixed: Boolean;
+  temp: Integer;
+  prevx, prevy: Integer;
+  lastDistSq: Integer;
+  ccidx, curci: Integer;
+  hasUntried: Boolean;
+  lastGA: Integer = -1;
+  ga, x, y: Integer;
+  lastObj: ITP;
+  wasHit: Boolean = false;
+  gw, gh, minx, miny, maxx, maxy: Integer;
+  cc: PGridCell;
+  px: PBodyProxyRec;
+  lq: LongWord;
+  f, ptag, distSq: Integer;
+  x0, y0, x1, y1: Integer;
+begin
+  result := Default(ITP);
+  lastObj := Default(ITP);
+  tagmask := tagmask and TagFullMask;
+  ex := ax1; // why not?
+  ey := ay1; // why not?
+  if (tagmask = 0) then exit;
+
+  if (ax0 = ax1) and (ay0 = ay1) then
+  begin
+    result := forEachAtPoint(ax0, ay0, nil, tagmask, @ptag);
+    if (result <> nil) then
+    begin
+      if assigned(cb) and not cb(result, ptag, ax0, ay0, ax0, ay0) then result := Default(ITP);
+    end;
+    exit;
+  end;
+
+  lastDistSq := distanceSq(ax0, ay0, ax1, ay1)+1;
+
+  gw := mWidth;
+  gh := mHeight;
+  minx := mMinX;
+  miny := mMinY;
+  maxx := gw*tsize-1;
+  maxy := gh*tsize-1;
+
+  {$IF DEFINED(D2F_DEBUG_RAYTRACE)}
+  if assigned(dbgRayTraceTileHitCB) then e_WriteLog(Format('TRACING: (%d,%d)-(%d,%d) [(%d,%d)-(%d,%d)]; maxdistsq=%d', [ax0, ay0, ax1, ay1, minx, miny, maxx, maxy, lastDistSq]), MSG_NOTIFY);
+  {$ENDIF}
+
+  x0 := ax0;
+  y0 := ay0;
+  x1 := ax1;
+  y1 := ay1;
+
+  // offset query coords to (0,0)-based
+  Dec(x0, minx);
+  Dec(y0, miny);
+  Dec(x1, minx);
+  Dec(y1, miny);
+
+  // clip rectange
+  wx0 := 0;
+  wy0 := 0;
+  wx1 := maxx;
+  wy1 := maxy;
+
+  // horizontal setup
+  if (x0 < x1) then
+  begin
+    // from left to right
+    if (x0 > wx1) or (x1 < wx0) then exit; // out of screen
+    stx := 1; // going right
+  end
+  else
+  begin
+    // from right to left
+    if (x1 > wx1) or (x0 < wx0) then exit; // out of screen
+    stx := -1; // going left
+    x0 := -x0;
+    x1 := -x1;
+    wx0 := -wx0;
+    wx1 := -wx1;
+    swapInt(wx0, wx1);
+  end;
+
+  // vertical setup
+  if (y0 < y1) then
+  begin
+    // from top to bottom
+    if (y0 > wy1) or (y1 < wy0) then exit; // out of screen
+    sty := 1; // going down
+  end
+  else
+  begin
+    // from bottom to top
+    if (y1 > wy1) or (y0 < wy0) then exit; // out of screen
+    sty := -1; // going up
+    y0 := -y0;
+    y1 := -y1;
+    wy0 := -wy0;
+    wy1 := -wy1;
+    swapInt(wy0, wy1);
+  end;
+
+  dsx := x1-x0;
+  dsy := y1-y0;
+
+  if (dsx < dsy) then
+  begin
+    xptr := @yd;
+    yptr := @xd;
+    swapInt(x0, y0);
+    swapInt(x1, y1);
+    swapInt(dsx, dsy);
+    swapInt(wx0, wy0);
+    swapInt(wx1, wy1);
+    swapInt(stx, sty);
+  end
+  else
+  begin
+    xptr := @xd;
+    yptr := @yd;
+  end;
+
+  dx2 := 2*dsx;
+  dy2 := 2*dsy;
+  xd := x0;
+  yd := y0;
+  e := 2*dsy-dsx;
+  term := x1;
+
+  xfixed := false;
+  if (y0 < wy0) then
+  begin
+    // clip at top
+    temp := dx2*(wy0-y0)-dsx;
+    xd += temp div dy2;
+    rem := temp mod dy2;
+    if (xd > wx1) then exit; // x is moved out of clipping rect, nothing to do
+    if (xd+1 >= wx0) then
+    begin
+      yd := wy0;
+      e -= rem+dsx;
+      if (rem > 0) then begin Inc(xd); e += dy2; end;
+      xfixed := true;
+    end;
+  end;
+
+  if (not xfixed) and (x0 < wx0) then
+  begin
+    // clip at left
+    temp := dy2*(wx0-x0);
+    yd += temp div dx2;
+    rem := temp mod dx2;
+    if (yd > wy1) or (yd = wy1) and (rem >= dsx) then exit;
+    xd := wx0;
+    e += rem;
+    if (rem >= dsx) then begin Inc(yd); e -= dx2; end;
+  end;
+
+  if (y1 > wy1) then
+  begin
+    // clip at bottom
+    temp := dx2*(wy1-y0)+dsx;
+    term := x0+temp div dy2;
+    rem := temp mod dy2;
+    if (rem = 0) then Dec(term);
+  end;
+
+  if (term > wx1) then term := wx1; // clip at right
+
+  Inc(term); // draw last point
+  //if (term = xd) then exit; // this is the only point, get out of here
+
+  if (sty = -1) then yd := -yd;
+  if (stx = -1) then begin xd := -xd; term := -term; end;
+  dx2 -= dy2;
+
+  // first move, to skip starting point
+  // DON'T DO THIS! loop will take care of that
+  if (xd = term) then
+  begin
+    result := forEachAtPoint(ax0, ay0, nil, tagmask, @ptag);
+    if (result <> nil) then
+    begin
+      if assigned(cb) then
+      begin
+        if cb(result, ptag, ax0, ay0, ax0, ay0) then
+        begin
+          ex := ax0;
+          ey := ay0;
+        end
+        else
+        begin
+          result := nil;
+        end;
+      end
+      else
+      begin
+        ex := ax0;
+        ey := ay0;
+      end;
+    end;
+    exit;
+  end;
+
+  prevx := xptr^+minx;
+  prevy := yptr^+miny;
+  (*
+  // move coords
+  if (e >= 0) then begin yd += sty; e -= dx2; end else e += dy2;
+  xd += stx;
+  // done?
+  if (xd = term) then exit;
+  *)
+
+  {$IF DEFINED(D2F_DEBUG)}
+  if (xptr^ < 0) or (yptr^ < 0) or (xptr^ >= gw*tsize) and (yptr^ >= gh*tsize) then raise Exception.Create('raycaster internal error (0)');
+  {$ENDIF}
+  // DON'T DO THIS! loop will take care of that
+  //lastGA := (yptr^ div tsize)*gw+(xptr^ div tsize);
+  //ccidx := mGrid[lastGA];
+
+  {$IF DEFINED(D2F_DEBUG_RAYTRACE)}
+  //if assigned(dbgRayTraceTileHitCB) then e_WriteLog('1:TRACING!', MSG_NOTIFY);
+  {$ENDIF}
+
+  {$IF DEFINED(D2F_DEBUG_RAYTRACE)}
+  if assigned(dbgRayTraceTileHitCB) then dbgRayTraceTileHitCB((xptr^ div tsize*tsize)+minx, (yptr^ div tsize*tsize)+miny);
+  {$ENDIF}
+
+  //if (dbgShowTraceLog) then e_WriteLog(Format('raycast start: (%d,%d)-(%d,%d); xptr^=%d; yptr^=%d', [ax0, ay0, ax1, ay1, xptr^, yptr^]), MSG_NOTIFY);
+
+  // increase query counter
+  Inc(mLastQuery);
+  if (mLastQuery = 0) then
+  begin
+    // just in case of overflow
+    mLastQuery := 1;
+    for f := 0 to High(mProxies) do mProxies[f].mQueryMark := 0;
+  end;
+  lq := mLastQuery;
+
+  ccidx := -1;
+  // draw it; can omit checks
+  while (xd <> term) do
+  begin
+    // check cell(s)
+    {$IF DEFINED(D2F_DEBUG)}
+    if (xptr^ < 0) or (yptr^ < 0) or (xptr^ >= gw*tsize) and (yptr^ >= gh*tsize) then raise Exception.Create('raycaster internal error (0)');
+    {$ENDIF}
+    // new tile?
+    ga := (yptr^ div tsize)*gw+(xptr^ div tsize);
+    {$IF DEFINED(D2F_DEBUG_RAYTRACE)}
+    if assigned(dbgRayTraceTileHitCB) then e_WriteLog(Format(' xd=%d; term=%d; gx=%d; gy=%d; ga=%d; lastga=%d', [xd, term, xptr^, yptr^, ga, lastGA]), MSG_NOTIFY);
+    {$ENDIF}
+    if (ga <> lastGA) then
+    begin
+      // yes
+      {$IF DEFINED(D2F_DEBUG)}
+      if assigned(dbgRayTraceTileHitCB) then dbgRayTraceTileHitCB((xptr^ div tsize*tsize)+minx, (yptr^ div tsize*tsize)+miny);
+      {$ENDIF}
+      if (ccidx <> -1) then
+      begin
+        // signal cell completion
+        if assigned(cb) then
+        begin
+          if cb(nil, 0, xptr^+minx, yptr^+miny, prevx, prevy) then begin result := lastObj; exit; end;
+        end
+        else if wasHit then
+        begin
+          result := lastObj;
+          exit;
+        end;
+      end;
+      lastGA := ga;
+      ccidx := mGrid[lastGA];
+    end;
+    // has something to process in this tile?
+    if (ccidx <> -1) then
+    begin
+      // process cell
+      curci := ccidx;
+      hasUntried := false; // this will be set to `true` if we have some proxies we still want to process at the next step
+      // convert coords to map (to avoid ajdusting coords inside the loop)
+      x := xptr^+minx;
+      y := yptr^+miny;
+      // process cell list
+      while (curci <> -1) do
+      begin
+        cc := @mCells[curci];
+        for f := 0 to GridCellBucketSize-1 do
+        begin
+          if (cc.bodies[f] = -1) then break;
+          px := @mProxies[cc.bodies[f]];
+          ptag := px.mTag;
+          if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) then
+          begin
+            // can we process this proxy?
+            if (x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight) then
+            begin
+              px.mQueryMark := lq; // mark as processed
+              if assigned(cb) then
+              begin
+                if cb(px.mObj, ptag, x, y, prevx, prevy) then
+                begin
+                  result := lastObj;
+                  ex := prevx;
+                  ey := prevy;
+                  exit;
+                end;
+                (*
+                  {$IF DEFINED(D2F_DEBUG_RAYTRACE)}
+                  distSq := distanceSq(ax0, ay0, prevx, prevy);
+                  if assigned(dbgRayTraceTileHitCB) then e_WriteLog(Format('  hit(%d): a=(%d,%d), h=(%d,%d), p=(%d,%d); distsq=%d; lastsq=%d', [cc.bodies[f], ax0, ay0, x, y, prevx, prevy, distSq, lastDistSq]), MSG_NOTIFY);
+                  if (distSq < lastDistSq) then
+                  begin
+                    wasHit := true;
+                    lastDistSq := distSq;
+                    ex := prevx;
+                    ey := prevy;
+                    lastObj := px.mObj;
+                  end;
+                  {$ENDIF}
+                *)
+              end
+              else
+              begin
+                // remember this hitpoint if it is nearer than an old one
+                distSq := distanceSq(ax0, ay0, prevx, prevy);
+                {$IF DEFINED(D2F_DEBUG_RAYTRACE)}
+                if assigned(dbgRayTraceTileHitCB) then e_WriteLog(Format('  hit(%d): a=(%d,%d), h=(%d,%d), p=(%d,%d); distsq=%d; lastsq=%d', [cc.bodies[f], ax0, ay0, x, y, prevx, prevy, distSq, lastDistSq]), MSG_NOTIFY);
+                {$ENDIF}
+                if (distSq < lastDistSq) then
+                begin
+                  wasHit := true;
+                  lastDistSq := distSq;
+                  ex := prevx;
+                  ey := prevy;
+                  lastObj := px.mObj;
+                end;
+              end;
+            end
+            else
+            begin
+              // this is possibly interesting proxy, set "has more to check" flag
+              hasUntried := true;
+            end;
+          end;
+        end;
+        // next cell
+        curci := cc.next;
+      end;
+      // still has something interesting in this cell?
+      if not hasUntried then
+      begin
+        // nope, don't process this cell anymore; signal cell completion
+        ccidx := -1;
+        if assigned(cb) then
+        begin
+          if cb(nil, 0, x, y, prevx, prevy) then begin result := lastObj; exit; end;
+        end
+        else if wasHit then
+        begin
+          result := lastObj;
+          exit;
+        end;
+      end;
+    end;
+    //putPixel(xptr^, yptr^);
+    // move coords
+    prevx := xptr^+minx;
+    prevy := yptr^+miny;
+    if (e >= 0) then begin yd += sty; e -= dx2; end else e += dy2;
+    xd += stx;
+  end;
+  // we can travel less than one cell
+  if wasHit and not assigned(cb) then
+  begin
+    result := lastObj;
+  end
+  else
+  begin
+    ex := ax1; // why not?
+    ey := ay1; // why not?
+  end;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+//FIXME! optimize this with real tile walking
+function TBodyGridBase.forEachAlongLine (const x0, y0, x1, y1: Integer; cb: TGridAlongQueryCB; tagmask: Integer=-1; log: Boolean=false): ITP;
+const
+  tsize = mTileSize;
+var
+  i: Integer;
+  dx, dy, d: Integer;
+  xerr, yerr: Integer;
+  incx, incy: Integer;
+  stepx, stepy: Integer;
+  x, y: Integer;
+  maxx, maxy: Integer;
+  gw, gh: Integer;
+  ccidx: Integer;
+  curci: Integer;
+  cc: PGridCell;
+  px: PBodyProxyRec;
+  lq: LongWord;
+  minx, miny: Integer;
+  ptag: Integer;
+  lastWasInGrid: Boolean;
+  tbcross: Boolean;
+  f: Integer;
+  //tedist: Integer;
+begin
+  log := false;
+  result := Default(ITP);
+  tagmask := tagmask and TagFullMask;
+  if (tagmask = 0) or not assigned(cb) then exit;
+
+  minx := mMinX;
+  miny := mMinY;
+
+  dx := x1-x0;
+  dy := y1-y0;
+
+  if (dx > 0) then incx := 1 else if (dx < 0) then incx := -1 else incx := 0;
+  if (dy > 0) then incy := 1 else if (dy < 0) then incy := -1 else incy := 0;
+
+  if (incx = 0) and (incy = 0) then exit; // just incase
+
+  dx := abs(dx);
+  dy := abs(dy);
+
+  if (dx > dy) then d := dx else d := dy;
+
+  // `x` and `y` will be in grid coords
+  x := x0-minx;
+  y := y0-miny;
+
+  // increase query counter
+  Inc(mLastQuery);
+  if (mLastQuery = 0) then
+  begin
+    // just in case of overflow
+    mLastQuery := 1;
+    for i := 0 to High(mProxies) do mProxies[i].mQueryMark := 0;
+  end;
+  lq := mLastQuery;
+
+  // cache various things
+  //tsize := mTileSize;
+  gw := mWidth;
+  gh := mHeight;
+  maxx := gw*tsize-1;
+  maxy := gh*tsize-1;
+
+  // setup distance and flags
+  lastWasInGrid := (x >= 0) and (y >= 0) and (x <= maxx) and (y <= maxy);
+
+  // setup starting tile ('cause we'll adjust tile vars only on tile edge crossing)
+  if lastWasInGrid then ccidx := mGrid[(y div tsize)*gw+(x div tsize)] else ccidx := -1;
+
+  // it is slightly faster this way
+  xerr := -d;
+  yerr := -d;
+
+  if (log) then e_WriteLog(Format('tracing: (%d,%d)-(%d,%d)', [x, y, x1-minx, y1-miny]), MSG_NOTIFY);
+
+  // now trace
+  i := 0;
+  while (i < d) do
+  begin
+    Inc(i);
+    // do one step
+    xerr += dx;
+    yerr += dy;
+    // invariant: one of those always changed
+    {$IF DEFINED(D2F_DEBUG)}
+    if (xerr < 0) and (yerr < 0) then raise Exception.Create('internal bug in grid raycaster (0)');
+    {$ENDIF}
+    if (xerr >= 0) then begin xerr -= d; x += incx; stepx := incx; end else stepx := 0;
+    if (yerr >= 0) then begin yerr -= d; y += incy; stepy := incy; end else stepy := 0;
+    // invariant: we always doing a step
+    {$IF DEFINED(D2F_DEBUG)}
+    if ((stepx or stepy) = 0) then raise Exception.Create('internal bug in grid raycaster (1)');
+    {$ENDIF}
+    begin
+      // check for crossing tile/grid boundary
+      if (x >= 0) and (y >= 0) and (x <= maxx) and (y <= maxy) then
+      begin
+        // we're still in grid
+        lastWasInGrid := true;
+        // check for tile edge crossing
+             if (stepx < 0) and ((x mod tsize) = tsize-1) then tbcross := true
+        else if (stepx > 0) and ((x mod tsize) = 0) then tbcross := true
+        else if (stepy < 0) and ((y mod tsize) = tsize-1) then tbcross := true
+        else if (stepy > 0) and ((y mod tsize) = 0) then tbcross := true
+        else tbcross := false;
+        // crossed tile edge?
+        if tbcross then
+        begin
+          // setup new cell index
+          ccidx := mGrid[(y div tsize)*gw+(x div tsize)];
+          if (log) then e_WriteLog(Format(' stepped to new tile (%d,%d) -- (%d,%d)', [(x div tsize), (y div tsize), x, y]), MSG_NOTIFY);
+        end
+        else
+        if (ccidx = -1) then
+        begin
+          // we have nothing interesting here anymore, jump directly to tile edge
+          (*
+          if (incx = 0) then
+          begin
+            // vertical line
+            if (incy < 0) then tedist := y-(y and (not tsize)) else tedist := (y or (tsize-1))-y;
+            if (tedist > 1) then
+            begin
+              if (log) then e_WriteLog(Format('  doing vertical jump from tile (%d,%d) - (%d,%d) by %d steps', [(x div tsize), (y div tsize), x, y, tedist]), MSG_NOTIFY);
+              y += incy*tedist;
+              Inc(i, tedist);
+              if (log) then e_WriteLog(Format('   jumped to tile (%d,%d) - (%d,%d) by %d steps', [(x div tsize), (y div tsize), x, y, tedist]), MSG_NOTIFY);
+            end;
+          end
+          else if (incy = 0) then
+          begin
+            // horizontal line
+            if (incx < 0) then tedist := x-(x and (not tsize)) else tedist := (x or (tsize-1))-x;
+            if (tedist > 1) then
+            begin
+              if (log) then e_WriteLog(Format('  doing horizontal jump from tile (%d,%d) - (%d,%d) by %d steps', [(x div tsize), (y div tsize), x, y, tedist]), MSG_NOTIFY);
+              x += incx*tedist;
+              Inc(i, tedist);
+              if (log) then e_WriteLog(Format('   jumped to tile (%d,%d) - (%d,%d) by %d steps', [(x div tsize), (y div tsize), x, y, tedist]), MSG_NOTIFY);
+            end;
+          end;
+          *)
+          (*
+           else if (
+          // get minimal distance to tile edges
+          if (incx < 0) then tedist := x-(x and (not tsize)) else if (incx > 0) then tedist := (x or (tsize+1))-x else tedist := 0;
+          {$IF DEFINED(D2F_DEBUG)}
+          if (tedist < 0) then raise Exception.Create('internal bug in grid raycaster (2.x)');
+          {$ENDIF}
+          if (incy < 0) then f := y-(y and (not tsize)) else if (incy > 0) then f := (y or (tsize+1))-y else f := 0;
+          {$IF DEFINED(D2F_DEBUG)}
+          if (f < 0) then raise Exception.Create('internal bug in grid raycaster (2.y)');
+          {$ENDIF}
+          if (tedist = 0) then tedist := f else if (f <> 0) then tedist := minInt(tedist, f);
+          // do jump
+          if (tedist > 1) then
+          begin
+            if (log) then e_WriteLog(Format('  doing jump from tile (%d,%d) - (%d,%d) by %d steps', [(x div tsize), (y div tsize), x, y, tedist]), MSG_NOTIFY);
+            xerr += dx*tedist;
+            yerr += dy*tedist;
+            if (xerr >= 0) then begin x += incx*((xerr div d)+1); xerr := (xerr mod d)-d; end;
+            if (yerr >= 0) then begin y += incy*((yerr div d)+1); yerr := (yerr mod d)-d; end;
+            Inc(i, tedist);
+            if (log) then e_WriteLog(Format('   jumped to tile (%d,%d) - (%d,%d) by %d steps', [(x div tsize), (y div tsize), x, y, tedist]), MSG_NOTIFY);
+          end;
+          *)
+        end;
+      end
+      else
+      begin
+        // out of grid
+        if lastWasInGrid then exit; // oops, stepped out of the grid -- there is no way to return
+      end;
+    end;
+
+    // has something to process in the current cell?
+    if (ccidx <> -1) then
+    begin
+      // process cell
+      curci := ccidx;
+      // convert coords to map (to avoid ajdusting coords inside the loop)
+      //Inc(x, minx);
+      //Inc(y, miny);
+      // process cell list
+      while (curci <> -1) do
+      begin
+        cc := @mCells[curci];
+        for f := 0 to GridCellBucketSize-1 do
+        begin
+          if (cc.bodies[f] = -1) then break;
+          px := @mProxies[cc.bodies[f]];
+          ptag := px.mTag;
+          if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) then
+          begin
+            px.mQueryMark := lq; // mark as processed
+            if cb(px.mObj, ptag) then begin result := px.mObj; exit; end;
+          end;
+        end;
+        // next cell
+        curci := cc.next;
+      end;
+      ccidx := -1; // don't process this anymore
+      // convert coords to grid
+      //Dec(x, minx);
+      //Dec(y, miny);
+    end;
+  end;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+(*
+function TBodyGridBase.traceRayWhileIn (const x0, y0, x1, y1: Integer; tagmask: Integer=-1): ITP; overload;
+var
+  ex, ey: Integer;
+begin
+  result := traceRayWhileIn(ex, ey, x0, y0, x1, y1, tagmask);
+end;
+
+
+// FUCKIN' PASTA!
+function TBodyGridBase.traceRayWhileIn (out ex, ey: Integer; const ax0, ay0, ax1, ay1: Integer; tagmask: Integer=-1): ITP;
+const
+  tsize = mTileSize;
+var
+  wx0, wy0, wx1, wy1: Integer; // window coordinates
+  stx, sty: Integer; // "steps" for x and y axes
+  dsx, dsy: Integer; // "lengthes" for x and y axes
+  dx2, dy2: Integer; // "double lengthes" for x and y axes
+  xd, yd: Integer; // current coord
+  e: Integer; // "error" (as in bresenham algo)
+  rem: Integer;
+  term: Integer;
+  xptr, yptr: PInteger;
+  xfixed: Boolean;
+  temp: Integer;
+  prevx, prevy: Integer;
+  lastDistSq: Integer;
+  ccidx, curci: Integer;
+  hasUntried: Boolean;
+  lastGA: Integer = -1;
+  ga, x, y: Integer;
+  lastObj: ITP;
+  wasHit: Boolean = false;
+  gw, gh, minx, miny, maxx, maxy: Integer;
+  cc: PGridCell;
+  px: PBodyProxyRec;
+  lq: LongWord;
+  f, ptag, distSq: Integer;
+  x0, y0, x1, y1: Integer;
+  inx, iny: Integer;
+begin
+  result := Default(ITP);
+  lastObj := Default(ITP);
+  tagmask := tagmask and TagFullMask;
+  ex := ax1; // why not?
+  ey := ay1; // why not?
+  if (tagmask = 0) then exit;
+
+  if (ax0 = ax1) and (ay0 = ay1) then exit; // doesn't matter
+
+  // we should start inside
+  if (forEachAtPoint(ax0, ay0, nil, tagmask, @ptag) = nil) then
+  begin
+    ex := ax0; // why not?
+    ey := ay0; // why not?
+    exit;
+  end;
+
+  lastDistSq := distanceSq(ax0, ay0, ax1, ay1)+1;
+
+  gw := mWidth;
+  gh := mHeight;
+  minx := mMinX;
+  miny := mMinY;
+  maxx := gw*tsize-1;
+  maxy := gh*tsize-1;
+
+  x0 := ax0;
+  y0 := ay0;
+  x1 := ax1;
+  y1 := ay1;
+
+  // offset query coords to (0,0)-based
+  Dec(x0, minx);
+  Dec(y0, miny);
+  Dec(x1, minx);
+  Dec(y1, miny);
+
+  // clip rectange
+  wx0 := 0;
+  wy0 := 0;
+  wx1 := maxx;
+  wy1 := maxy;
+
+  // horizontal setup
+  if (x0 < x1) then
+  begin
+    // from left to right
+    if (x0 > wx1) or (x1 < wx0) then exit; // out of screen
+    stx := 1; // going right
+  end
+  else
+  begin
+    // from right to left
+    if (x1 > wx1) or (x0 < wx0) then exit; // out of screen
+    stx := -1; // going left
+    x0 := -x0;
+    x1 := -x1;
+    wx0 := -wx0;
+    wx1 := -wx1;
+    swapInt(wx0, wx1);
+  end;
+
+  // vertical setup
+  if (y0 < y1) then
+  begin
+    // from top to bottom
+    if (y0 > wy1) or (y1 < wy0) then exit; // out of screen
+    sty := 1; // going down
+  end
+  else
+  begin
+    // from bottom to top
+    if (y1 > wy1) or (y0 < wy0) then exit; // out of screen
+    sty := -1; // going up
+    y0 := -y0;
+    y1 := -y1;
+    wy0 := -wy0;
+    wy1 := -wy1;
+    swapInt(wy0, wy1);
+  end;
+
+  dsx := x1-x0;
+  dsy := y1-y0;
+
+  if (dsx < dsy) then
+  begin
+    xptr := @yd;
+    yptr := @xd;
+    swapInt(x0, y0);
+    swapInt(x1, y1);
+    swapInt(dsx, dsy);
+    swapInt(wx0, wy0);
+    swapInt(wx1, wy1);
+    swapInt(stx, sty);
+  end
+  else
+  begin
+    xptr := @xd;
+    yptr := @yd;
+  end;
+
+  dx2 := 2*dsx;
+  dy2 := 2*dsy;
+  xd := x0;
+  yd := y0;
+  e := 2*dsy-dsx;
+  term := x1;
+
+  xfixed := false;
+  if (y0 < wy0) then
+  begin
+    // clip at top
+    temp := dx2*(wy0-y0)-dsx;
+    xd += temp div dy2;
+    rem := temp mod dy2;
+    if (xd > wx1) then exit; // x is moved out of clipping rect, nothing to do
+    if (xd+1 >= wx0) then
+    begin
+      yd := wy0;
+      e -= rem+dsx;
+      if (rem > 0) then begin Inc(xd); e += dy2; end;
+      xfixed := true;
+    end;
+  end;
+
+  if (not xfixed) and (x0 < wx0) then
+  begin
+    // clip at left
+    temp := dy2*(wx0-x0);
+    yd += temp div dx2;
+    rem := temp mod dx2;
+    if (yd > wy1) or (yd = wy1) and (rem >= dsx) then exit;
+    xd := wx0;
+    e += rem;
+    if (rem >= dsx) then begin Inc(yd); e -= dx2; end;
+  end;
+
+  if (y1 > wy1) then
+  begin
+    // clip at bottom
+    temp := dx2*(wy1-y0)+dsx;
+    term := x0+temp div dy2;
+    rem := temp mod dy2;
+    if (rem = 0) then Dec(term);
+  end;
+
+  if (term > wx1) then term := wx1; // clip at right
+
+  Inc(term); // draw last point
+  //if (term = xd) then exit; // this is the only point, get out of here
+
+  if (sty = -1) then yd := -yd;
+  if (stx = -1) then begin xd := -xd; term := -term; end;
+  dx2 -= dy2;
+
+  // first move, to skip starting point
+  // DON'T DO THIS! loop will take care of that
+  if (xd = term) then
+  begin
+    result := forEachAtPoint(ax0, ay0, nil, tagmask, @ptag);
+    if (result <> nil) and ((ptag and tagmask) <> 0) then result := nil;
+    exit;
+  end;
+
+  prevx := xptr^+minx;
+  prevy := yptr^+miny;
+
+  // increase query counter
+  Inc(mLastQuery);
+  if (mLastQuery = 0) then
+  begin
+    // just in case of overflow
+    mLastQuery := 1;
+    for f := 0 to High(mProxies) do mProxies[f].mQueryMark := 0;
+  end;
+  lq := mLastQuery;
+
+  ccidx := -1;
+  // draw it; can omit checks
+  while (xd <> term) do
+  begin
+    // check cell(s)
+    // new tile?
+    ga := (yptr^ div tsize)*gw+(xptr^ div tsize);
+    if (ga <> lastGA) then
+    begin
+      // yes
+      lastGA := ga;
+      ccidx := mGrid[lastGA];
+      // no objects in cell == exit
+      if (ccidx = -1) then exit;
+    end;
+    // has something to process in this tile?
+    if (ccidx <> -1) then
+    begin
+      // process cell
+      curci := ccidx;
+      // convert coords to map (to avoid ajdusting coords inside the loop)
+      x := xptr^+minx;
+      y := yptr^+miny;
+      wasHit := false;
+      // process cell list
+      while (curci <> -1) do
+      begin
+        cc := @mCells[curci];
+        for f := 0 to GridCellBucketSize-1 do
+        begin
+          if (cc.bodies[f] = -1) then break;
+          px := @mProxies[cc.bodies[f]];
+          ptag := px.mTag;
+          if ((ptag and TagDisabled) = 0) and (px.mQueryMark <> lq) then
+          begin
+function lineAABBIntersects (x0, y0, x1, y1: Integer; bx, by, bw, bh: Integer; out inx, iny: Integer): Boolean;
+            // can we process this proxy?
+            if (x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight) then
+            begin
+              px.mQueryMark := lq; // mark as processed
+              if ((ptag and tagmask) = 0) then
+              begin
+                result := px.mObj;
+                ex := x;
+                ey := y;
+                exit;
+              end;
+              // march out of the panel/cell
+              while (xd <> term) do
+              begin
+                if (e >= 0) then begin yd += sty; e -= dx2; end else e += dy2;
+                xd += stx;
+                // new cell?
+                ga := (yptr^ div tsize)*gw+(xptr^ div tsize);
+                if (ga <> lastGA) then break;
+                // out of panel?
+                if not ((x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight)) then break;
+              end;
+            end;
+          end;
+        end;
+        // next cell
+        curci := cc.next;
+      end;
+      // still has something interesting in this cell?
+      if not hasUntried then
+      begin
+        // nope, don't process this cell anymore; signal cell completion
+        ccidx := -1;
+        if assigned(cb) then
+        begin
+          if cb(nil, 0, x, y, prevx, prevy) then begin result := lastObj; exit; end;
+        end
+        else if wasHit then
+        begin
+          result := lastObj;
+          exit;
+        end;
+      end;
+    end;
+    //putPixel(xptr^, yptr^);
+    // move coords
+    prevx := xptr^+minx;
+    prevy := yptr^+miny;
+    if (e >= 0) then begin yd += sty; e -= dx2; end else e += dy2;
+    xd += stx;
+  end;
+  // we can travel less than one cell
+  if wasHit and not assigned(cb) then
+  begin
+    result := lastObj;
+  end
+  else
+  begin
+    ex := ax1; // why not?
+    ey := ay1; // why not?
+  end;
+end;
+*)
+
+
 end.