X-Git-Url: http://deadsoftware.ru/gitweb?a=blobdiff_plain;f=src%2Fgame%2Fg_grid.pas;h=427482fda6e4a61ab3d088df39acc4f73e46c3a0;hb=d7d166dc3cd287276202e862746208892c4cc89f;hp=ffa05200c4d91b6957a186a6142ab6abe5d0ab1e;hpb=ec7e4d0515981f6f3503fc06552b73dfeaf8b3e6;p=d2df-sdl.git
diff --git a/src/game/g_grid.pas b/src/game/g_grid.pas
index ffa0520..427482f 100644
--- a/src/game/g_grid.pas
+++ b/src/game/g_grid.pas
@@ -13,586 +13,2815 @@
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*)
-{$MODE DELPHI}
-{$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}
+{.$DEFINE GRID_USE_ORTHO_ACCEL}
+{$DEFINE LINEAABB2}
unit g_grid;
interface
-uses e_log;
+uses
+ mempool;
const
- GridDefaultTileSize = 32;
+ GridTileSize = 32; // must be power of two!
type
- GridQueryCB = function (obj: TObject; tag: Integer): Boolean is nested; // return `true` to stop
+ TBodyProxyId = Integer;
-type
- TBodyGrid = class;
+ generic TBodyGridBase = class(TPoolObject)
+ 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 TCellQueryCB = procedure (x, y: Integer) is nested; // top-left cell corner coords
- 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;
- prevLink: TBodyProxy; // only for used
- nextLink: TBodyProxy; // either used or free
+ const TagDisabled = $40000000;
+ const TagFullMask = $3fffffff;
private
- procedure setup (aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
+ const
+ 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;
+ 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
+
+ private
+ procedure setup (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer);
+
+ function getTag (): Integer; inline;
+ procedure setTag (v: Integer); inline;
+
+ function getEnabled (): Boolean; inline;
+ procedure setEnabled (v: Boolean); inline;
+
+ function getX1 (): Integer; inline;
+ function getY1 (): Integer; inline;
+
+ public
+ property x: Integer read mX;
+ property y: Integer read mY;
+ property width: Integer read mWidth;
+ property height: Integer read mHeight;
+ property tag: Integer read getTag write setTag;
+ property enabled: Boolean read getEnabled write setEnabled;
+ property obj: ITP read mObj;
+
+ property x0: Integer read mX;
+ property y0: Integer read mY;
+ property x1: Integer read getX1;
+ property y1: Integer read getY1;
+ end;
- 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
+ type
+ PGridCell = ^TGridCell;
+ TGridCell = record
+ bodies: array [0..GridCellBucketSize-1] of Integer; // -1: end of list
+ next: Integer; // in this cell; index in mCells
+ end;
- PGridCell = ^TGridCell;
- TGridCell = record
- body: TBodyProxy;
- next: Integer; // in this cell; index in mCells
- end;
+ TCellArray = array of TGridCell;
+
+ TGridInternalCB = function (grida: Integer; bodyId: TBodyProxyId): Boolean of object; // return `true` to stop
+
+ private
+ //mTileSize: Integer;
+ const mTileSize = GridTileSize;
+ type TGetProxyFn = function (pxidx: Integer): PBodyProxyRec of object;
- GridInternalCB = function (grida: Integer): Boolean is nested; // return `true` to stop
+ public
+ const tileSize = mTileSize;
+
+ type
+ TAtPointEnumerator = record
+ private
+ mCells: TCellArray;
+ curidx, curbki: Integer;
+ getpx: TGetProxyFn;
+ public
+ constructor Create (acells: TCellArray; aidx: Integer; agetpx: TGetProxyFn);
+ function MoveNext (): Boolean; inline;
+ function getCurrent (): PBodyProxyRec; inline;
+ property Current: PBodyProxyRec read getCurrent;
+ end;
- 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
+ mCells: TCellArray; // cell pool
mFreeCell: Integer; // first free cell index or -1
- mLastQuery: Integer;
+ mLastQuery: LongWord;
mUsedCells: Integer;
- mProxyFree: TBodyProxy; // free
- mProxyList: TBodyProxy; // used
- mProxyCount: Integer; // total allocated
+ mProxies: array of TBodyProxyRec;
+ mProxyFree: TBodyProxyId; // free
+ mProxyCount: Integer; // currently used
+ mProxyMaxCount: Integer;
+ mInQuery: Boolean;
+
+ 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
- function allocProxy (aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer): TBodyProxy;
- procedure freeProxy (body: TBodyProxy);
+ function allocProxy (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer): TBodyProxyId;
+ procedure freeProxy (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;
- procedure insert (body: TBodyProxy);
- procedure remove (body: TBodyProxy);
+ function getGridWidthPx (): Integer; inline;
+ function getGridHeightPx (): Integer; inline;
- function forGridRect (x, y, w, h: Integer; cb: GridInternalCB): Boolean;
+ function getProxyById (idx: TBodyProxyId): PBodyProxyRec; 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 removeBody (aObj: TBodyProxy); // WARNING! this will NOT destroy proxy!
-
- 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;
+
+ //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;
+
+ //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;
+
+ function atCellInPoint (x, y: Integer): TAtPointEnumerator;
+
+ //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 traceRayOld (const x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP; overload;
+ function traceRayOld (out ex, ey: Integer; const ax0, ay0, ax1, ay1: Integer; cb: TGridRayQueryCB; 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)
+ // 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
+ // `cb` is used unconvetionally here: if it returns `false`, tracer will ignore the object
+ //WARNING: don't change tags in callbacks here!
+ function traceRay (const x0, y0, x1, y1: Integer; cb: TGridQueryCB; tagmask: Integer=-1): ITP; overload;
+ function traceRay (out ex, ey: Integer; const ax0, ay0, ax1, ay1: Integer; cb: TGridQueryCB; tagmask: Integer=-1): ITP;
+
+ // return `false` if we're still inside at the end
+ // line should be either strict horizontal, or strict vertical, otherwise an exception will be thrown
+ // `true`: endpoint will point at the last "inside" pixel
+ // `false`: endpoint will be (ax1, ay1)
+ //WARNING: don't change tags in callbacks here!
+ function traceOrthoRayWhileIn (out ex, ey: Integer; ax0, ay0, ax1, ay1: Integer; tagmask: Integer=-1): 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)
+ // 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 (ax0, ay0, ax1, ay1: Integer; cb: TGridQueryCB; tagmask: Integer=-1; log: Boolean=false): ITP;
+
+ // trace box with the given velocity; return object hit (if any)
+ // `cb` is used unconvetionally here: if it returns `false`, tracer will ignore the object
+ //WARNING: don't change tags in callbacks here!
+ function traceBox (out ex, ey: Integer; const ax0, ay0, aw, ah: Integer; const dx, dy: Integer; cb: TGridQueryCB; tagmask: Integer=-1): ITP;
+
+ // debug
+ procedure forEachBodyCell (body: TBodyProxyId; cb: TCellQueryCB);
+ function forEachInCell (x, y: Integer; cb: TGridQueryCB): ITP;
+ procedure dumpStats ();
- function forEachInAABB (x, y, w, h: Integer; cb: GridQueryCB): Boolean;
+ public
+ //WARNING! no sanity checks!
+ property proxyEnabled[pid: TBodyProxyId]: Boolean read getProxyEnabled write setProxyEnabled;
- function getProxyForBody (aObj: TObject; x, y, w, h: Integer): TBodyProxy;
+ property gridX0: Integer read mMinX;
+ property gridY0: Integer read mMinY;
+ property gridWidth: Integer read getGridWidthPx; // in pixels
+ property gridHeight: Integer read getGridHeightPx; // in pixels
- procedure dumpStats ();
+ property proxy[idx: TBodyProxyId]: PBodyProxyRec read getProxyById;
end;
type
- TBinaryHeapLessFn = function (a, b: TObject): Boolean;
-
- TBinaryHeapObj = class(TObject)
- private
- elem: array of TObject;
- elemUsed: Integer;
- lessfn: TBinaryHeapLessFn;
+ // common structure for all line tracers
+ TLineWalker = record
+ public
+ const TileSize = GridTileSize;
private
- procedure heapify (root: Integer);
+ wx0, wy0, wx1, wy1: Integer; // window coordinates
+ stx, sty: Integer; // "steps" for x and y axes
+ stleft: Integer; // "steps left"
+ err, errinc, errmax: Integer;
+ xd, yd: Integer; // current coord
+ horiz: Boolean;
public
- constructor Create (alessfn: TBinaryHeapLessFn);
- destructor Destroy (); override;
+ // call `setyp` after this
+ constructor Create (minx, miny, maxx, maxy: Integer);
- procedure clear ();
+ procedure setClip (minx, miny, maxx, maxy: Integer); inline;
- procedure insert (val: TObject);
+ // this will use `w[xy][01]` to clip coords
+ // return `false` if the whole line was clipped away
+ // on `true`, you should process first point, and go on
+ function setup (x0, y0, x1, y1: Integer): Boolean;
- function front (): TObject;
- procedure popFront ();
+ // call this *after* doing a step
+ // WARNING! if you will do a step when this returns `true`, you will fall into limbo
+ function done (): Boolean; inline;
- property count: Integer read elemUsed;
- end;
+ // as you will prolly call `done()` after doing a step anyway, this will do it for you
+ // move to next point, return `true` when the line is complete (i.e. you should stop)
+ function step (): Boolean; inline;
+ // move to next tile; return `true` if the line is complete (and walker state is undefined then)
+ function stepToNextTile (): Boolean; inline;
-implementation
+ procedure getXY (out ox, oy: Integer); inline;
-uses
- SysUtils;
+ public
+ // current coords
+ property x: Integer read xd;
+ property y: Integer read yd;
+ end;
-// ////////////////////////////////////////////////////////////////////////// //
-constructor TBodyProxy.Create (aGrid: TBodyGrid; aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
-begin
- mGrid := aGrid;
- setup(aX, aY, aWidth, aHeight, aObj, aTag);
-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;
+// sweep two AABB's to see if and when they are overlapping
+// returns `true` if collision was detected (but boxes doesn't overlap)
+// u1 and u1 has no sense if no collision was detected
+// u0 = normalized time of first collision (i.e. collision starts at myMove*u0)
+// u1 = normalized time of second collision (i.e. collision stops after myMove*u1)
+// hitedge for `it`: 0: top; 1: right; 2: bottom; 3: left
+// enter/exit coords will form non-intersecting configuration (i.e. will be before/after the actual collision)
+function sweepAABB (mex0, mey0, mew, meh: Integer; medx, medy: Integer; itx0, ity0, itw, ith: Integer;
+ u0: PSingle=nil; hitedge: PInteger=nil; u1: PSingle=nil): Boolean;
-destructor TBodyProxy.Destroy ();
-begin
- inherited;
-end;
+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;
-procedure TBodyProxy.setup (aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
-begin
- mX := aX;
- mY := aY;
- mWidth := aWidth;
- mHeight := aHeight;
- mQueryMark := 0;
- mObj := aObj;
- mTag := aTag;
- prevLink := nil;
- nextLink := nil;
-end;
+
+implementation
+
+uses
+ SysUtils, e_log, g_console, utils;
// ////////////////////////////////////////////////////////////////////////// //
-constructor TBodyGrid.Create (aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
-var
- idx: Integer;
-begin
- 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;
- SetLength(mGrid, mWidth*mHeight);
- SetLength(mCells, mWidth*mHeight);
- mFreeCell := 0;
- // init free list
- for idx := 0 to High(mCells) do
- begin
- mCells[idx].body := nil;
- 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;
- mLastQuery := 0;
- mUsedCells := 0;
- mProxyFree := nil;
- mProxyList := nil;
- mProxyCount := 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;
+procedure swapInt (var a: Integer; var b: Integer); inline; var t: Integer; begin t := a; a := b; b := t; end;
+//procedure swapInt (var a: Integer; var b: Integer); inline; begin a := a xor b; b := b xor a; a := a xor b; 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;
-destructor TBodyGrid.Destroy ();
-var
- px: TBodyProxy;
-begin
- // free all owned proxies
- while mProxyFree <> nil do
- begin
- px := mProxyFree;
- mProxyFree := px.nextLink;
- px.Free();
- end;
- while mProxyList <> nil do
+// ////////////////////////////////////////////////////////////////////////// //
+function clipLine (var x0, y0, x1, y1: Single; xmin, ymin, xmax, ymax: Single): Boolean;
+const
+ Inside = 0;
+ Left = 1;
+ Right = 2;
+ Bottom = 4;
+ Top = 8;
+
+ function xcode (x, y: Single): Byte; inline;
begin
- px := mProxyList;
- mProxyList := px.nextLink;
- px.Free();
+ result := Inside;
+ if (x < xmin) then result := result or Left else if (x > xmax) then result := result or Right;
+ if (y < ymin) then result := result or Bottom else if (y > ymax) then result := result or Top;
end;
- mCells := nil;
- mGrid := nil;
- inherited;
-end;
-
-
-procedure TBodyGrid.dumpStats ();
var
- idx, mcb, cidx, cnt: Integer;
+ outcode0, outcode1, outcodeOut: Byte;
+ x: Single = 0;
+ y: Single = 0;
begin
- mcb := 0;
- for idx := 0 to High(mGrid) do
+ result := false; // accept
+ outcode0 := xcode(x0, y0);
+ outcode1 := xcode(x1, y1);
+ while true do
begin
- cidx := mGrid[idx];
- cnt := 0;
- while cidx >= 0 do
+ if ((outcode0 or outcode1) = 0) then begin result := true; exit; end; // accept
+ if ((outcode0 and outcode1) <> 0) then exit; // reject
+ outcodeOut := outcode0;
+ if (outcodeOut = 0) then outcodeOut := outcode1;
+ if ((outcodeOut and Top) <> 0) then
begin
- Inc(cnt);
- cidx := mCells[cidx].next;
+ x := x0+(x1-x0)*(ymax-y0)/(y1-y0);
+ y := ymax;
+ end
+ else if ((outcodeOut and Bottom) <> 0) then
+ begin
+ x := x0+(x1-x0)*(ymin-y0)/(y1-y0);
+ y := ymin;
+ end
+ else if ((outcodeOut and Right) <> 0) then
+ begin
+ y := y0+(y1-y0)*(xmax-x0)/(x1-x0);
+ x := xmax;
+ end
+ else if ((outcodeOut and Left) <> 0) then
+ begin
+ y := y0+(y1-y0)*(xmin-x0)/(x1-x0);
+ x := xmin;
+ end;
+ if (outcodeOut = outcode0) then
+ begin
+ x0 := x;
+ y0 := y;
+ outcode0 := xcode(x0, y0);
+ end
+ else
+ begin
+ x1 := x;
+ y1 := y;
+ outcode1 := xcode(x1, y1);
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 bodies in cell: %d; proxies allocated: %d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize, mUsedCells, mcb, mProxyCount]), MSG_NOTIFY);
end;
-function TBodyGrid.allocCell: Integer;
+// 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
- idx: Integer;
+ sx0, sy0, sx1, sy1: Single;
begin
- if (mFreeCell < 0) then
+ inx := x0;
+ iny := y0;
+ result := false;
+ if (bw < 1) or (bh < 1) then exit;
+ if (x0 >= bx) and (y0 >= by) and (x0 < bx+bw) and (y0 < by+bh) then begin result := true; exit; end;
+ sx0 := x0; sy0 := y0;
+ sx1 := x1; sy1 := y1;
+ result := clipLine(sx0, sy0, sx1, sy1, bx, by, bx+bw-1, by+bh-1);
+ if result then
begin
- // no free cells, want more
- mFreeCell := Length(mCells);
- SetLength(mCells, mFreeCell+32768); // arbitrary number
- for idx := mFreeCell to High(mCells) do
- begin
- mCells[idx].body := nil;
- mCells[idx].next := idx+1;
- end;
- mCells[High(mCells)].next := -1; // last cell
+ inx := trunc(sx0);
+ iny := trunc(sy0);
+ // hack!
+ if (inx = bx) then Dec(inx) else if (inx = bx+bw-1) then Inc(inx);
+ if (iny = by) then Dec(iny) else if (iny = by+bh-1) then Inc(iny);
+ end
+ else
+ begin
+ inx := x1;
+ iny := y1;
end;
- result := mFreeCell;
- mFreeCell := mCells[result].next;
- mCells[result].next := -1;
- Inc(mUsedCells);
- //e_WriteLog(Format('grid: allocated new cell #%d (total: %d)', [result, mUsedCells]), MSG_NOTIFY);
end;
-procedure TBodyGrid.freeCell (idx: Integer);
+// ////////////////////////////////////////////////////////////////////////// //
+constructor TLineWalker.Create (minx, miny, maxx, maxy: Integer);
begin
- if (idx >= 0) and (idx < High(mCells)) then
- begin
- if mCells[idx].body = nil then exit; // the thing that should not be
- mCells[idx].body := nil;
- mCells[idx].next := mFreeCell;
- mFreeCell := idx;
- Dec(mUsedCells);
- end;
+ setClip(minx, miny, maxx, maxy);
end;
+procedure TLineWalker.setClip (minx, miny, maxx, maxy: Integer); inline;
+begin
+ // clip rectange
+ wx0 := minx;
+ wy0 := miny;
+ wx1 := maxx;
+ wy1 := maxy;
+end;
-function TBodyGrid.allocProxy (aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer): TBodyProxy;
+function TLineWalker.setup (x0, y0, x1, y1: Integer): Boolean;
+var
+ sx0, sy0, sx1, sy1: Single;
begin
- if (mProxyFree = nil) then
+ if (wx1 < wx0) or (wy1 < wy0) then begin stleft := 0; xd := x0; yd := y0; result := false; exit; end;
+
+ if (x0 >= wx0) and (y0 >= wy0) and (x0 <= wx1) and (y0 <= wy1) and
+ (x1 >= wx0) and (y1 >= wy0) and (x1 <= wx1) and (y1 <= wy1) then
begin
- // no free proxies, create new
- result := TBodyProxy.Create(self, aX, aY, aWidth, aHeight, aObj, aTag);
- Inc(mProxyCount);
+ result := true;
end
else
begin
- // get one from list
- result := mProxyFree;
- mProxyFree := result.nextLink;
- result.setup(aX, aY, aWidth, aHeight, aObj, aTag);
+ sx0 := x0; sy0 := y0;
+ sx1 := x1; sy1 := y1;
+ result := clipLine(sx0, sy0, sx1, sy1, wx0, wy0, wx1, wy1);
+ if not result then begin stleft := 0; xd := x0; yd := y0; exit; end;
+ x0 := trunc(sx0); y0 := trunc(sy0);
+ x1 := trunc(sx1); y1 := trunc(sy1);
end;
- // add to used list
- result.nextLink := mProxyList;
- if (mProxyList <> nil) then mProxyList.prevLink := result;
- mProxyList := result;
+
+ // check for ortho lines
+ if (y0 = y1) then
+ begin
+ // horizontal
+ horiz := true;
+ stleft := abs(x1-x0)+1;
+ if (x0 < x1) then stx := 1 else stx := -1;
+ sty := 0;
+ errinc := 0;
+ errmax := 10; // anything that is greater than zero
+ end
+ else if (x0 = x1) then
+ begin
+ // vertical
+ horiz := false;
+ stleft := abs(y1-y0)+1;
+ stx := 0;
+ if (y0 < y1) then sty := 1 else sty := -1;
+ errinc := 0;
+ errmax := 10; // anything that is greater than zero
+ end
+ else
+ begin
+ // diagonal
+ if (abs(x1-x0) >= abs(y1-y0)) then
+ begin
+ // horizontal
+ horiz := true;
+ stleft := abs(x1-x0)+1;
+ errinc := abs(y1-y0)+1;
+ end
+ else
+ begin
+ // vertical
+ horiz := false;
+ stleft := abs(y1-y0)+1;
+ errinc := abs(x1-x0)+1;
+ end;
+ if (x0 < x1) then stx := 1 else stx := -1;
+ if (y0 < y1) then sty := 1 else sty := -1;
+ errmax := stleft;
+ end;
+ xd := x0;
+ yd := y0;
+ err := -errmax;
end;
-procedure TBodyGrid.freeProxy (body: TBodyProxy);
+function TLineWalker.done (): Boolean; inline; begin result := (stleft <= 0); end;
+
+// true: done
+function TLineWalker.step (): Boolean; inline;
begin
- if body = nil then exit; // just in case
- // remove from used list
- if (body.prevLink = nil) then
+ if horiz then
begin
- // this must be head
- if (body <> mProxyList) then raise Exception.Create('wutafuuuuu in grid?');
- mProxyList := body.nextLink;
+ xd += stx;
+ err += errinc;
+ if (err >= 0) then begin err -= errmax; yd += sty; end;
end
else
begin
- body.prevLink.nextLink := body.nextLink;
+ yd += sty;
+ err += errinc;
+ if (err >= 0) then begin err -= errmax; xd += stx; end;
end;
- if (body.nextLink <> nil) then body.nextLink.prevLink := body.prevLink;
- // add to free list
- //body.mObj := nil; //WARNING! DON'T DO THIS! `removeBody()` depends on valid mObj
- body.prevLink := nil;
- body.nextLink := mProxyFree;
- mProxyFree := body;
+ Dec(stleft);
+ result := (stleft <= 0);
end;
-
-function TBodyGrid.forGridRect (x, y, w, h: Integer; cb: GridInternalCB): Boolean;
+// true: done
+function TLineWalker.stepToNextTile (): Boolean; inline;
var
- gx, gy: Integer;
+ ex, ey: Integer;
+ xwalk, ywalk, wklen: Integer; // to the respective edges
+ f: Integer;
begin
result := false;
- if (w < 1) or (h < 1) or not assigned(cb) then exit;
- if (x+w <= 0) or (y+h <= 0) then exit;
- if (x >= mWidth*mTileSize) or (y >= mHeight*mTileSize) then exit;
- for gy := y div mTileSize to (y+h-1) div mTileSize do
+
+ if (stleft < 2) then begin result := true; exit; end; // max one pixel left, nothing to do
+
+ // strictly horizontal?
+ if (sty = 0) then
begin
- if (gy < 0) then continue;
- if (gy >= mHeight) then break;
- for gx := x div mTileSize to (x+w-1) div mTileSize do
+ // only xd
+ if (stx < 0) then
+ begin
+ // xd: to left edge
+ ex := (xd and (not (TileSize-1)))-1;
+ stleft -= xd-ex;
+ end
+ else
begin
- if (gx < 0) then continue;
- if (gx >= mWidth) then break;
- if (cb(gy*mWidth+gx)) then begin result := true; exit; end;
+ // xd: to right edge
+ ex := (xd or (TileSize-1))+1;
+ stleft -= ex-xd;
end;
+ result := (stleft <= 0);
+ xd := ex;
+ exit;
end;
-end;
+ // strictly vertical?
+ if (stx = 0) then
+ begin
+ // only xd
+ if (sty < 0) then
+ begin
+ // yd: to top edge
+ ey := (yd and (not (TileSize-1)))-1;
+ stleft -= yd-ey;
+ end
+ else
+ begin
+ // yd: to bottom edge
+ ey := (yd or (TileSize-1))+1;
+ stleft -= ey-yd;
+ end;
+ result := (stleft <= 0);
+ yd := ey;
+ exit;
+ end;
-procedure TBodyGrid.insert (body: TBodyProxy);
+ // diagonal
- function inserter (grida: Integer): Boolean;
- var
- cidx: Integer;
+ // calculate xwalk
+ if (stx < 0) then
+ begin
+ ex := (xd and (not (TileSize-1)))-1;
+ xwalk := xd-ex;
+ end
+ else
begin
- result := false; // never stop
- // add body to the given grid cell
- 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[grida];
- mGrid[grida] := cidx;
+ ex := (xd or (TileSize-1))+1;
+ xwalk := ex-xd;
end;
-begin
- if body = nil then exit;
- forGridRect(body.mX, body.mY, body.mWidth, body.mHeight, inserter);
-end;
-
+ // calculate ywalk
+ if (sty < 0) then
+ begin
+ ey := (yd and (not (TileSize-1)))-1;
+ ywalk := yd-ey;
+ end
+ else
+ begin
+ ey := (yd or (TileSize-1))+1;
+ ywalk := ey-yd;
+ end;
-// absolutely not tested
-procedure TBodyGrid.remove (body: TBodyProxy);
+ {
+ while (xd <> ex) and (yd <> ey) do
+ begin
+ if horiz then
+ begin
+ xd += stx;
+ err += errinc;
+ if (err >= 0) then begin err -= errmax; yd += sty; end;
+ end
+ else
+ begin
+ yd += sty;
+ err += errinc;
+ if (err >= 0) then begin err -= errmax; xd += stx; end;
+ end;
+ Dec(stleft);
+ if (stleft < 1) then begin result := true; exit; end;
+ end;
+ }
- function remover (grida: Integer): Boolean;
- var
- pidx, idx, tmp: Integer;
+ if (xwalk <= ywalk) then wklen := xwalk else wklen := ywalk;
+ while true do
begin
- result := false; // never stop
- // find and remove cell
- pidx := -1;
- idx := mGrid[grida];
- while idx >= 0 do
+ // in which dir we want to walk?
+ stleft -= wklen;
+ if (stleft <= 0) then begin result := true; exit; end;
+ if horiz then
begin
- tmp := mCells[idx].next;
- if (mCells[idx].body = body) then
+ xd += wklen*stx;
+ for f := 1 to wklen do
begin
- if (pidx = -1) then mGrid[grida] := tmp else mCells[pidx].next := tmp;
- freeCell(idx);
- break; // assume that we cannot have one object added to bucket twice
- end
- else
+ err += errinc;
+ if (err >= 0) then begin err -= errmax; yd += sty; end;
+ end;
+ end
+ else
+ begin
+ yd += wklen*sty;
+ for f := 1 to wklen do
begin
- pidx := idx;
+ err += errinc;
+ if (err >= 0) then begin err -= errmax; xd += stx; end;
end;
- idx := tmp;
end;
+ // check for walk completion
+ if (xd = ex) or (yd = ey) then exit;
+ wklen := 1;
end;
-
-begin
- if body = nil then exit;
- forGridRect(body.mX, body.mY, body.mWidth, body.mHeight, remover);
-end;
-
-
-function TBodyGrid.insertBody (aObj: TObject; aX, aY, aWidth, aHeight: Integer; aTag: Integer=0): TBodyProxy;
-begin
- result := allocProxy(aX, aY, aWidth, aHeight, aObj, aTag);
- insert(result);
-end;
-
-
-// WARNING! this will NOT destroy proxy!
-procedure TBodyGrid.removeBody (aObj: TBodyProxy);
-begin
- if aObj = nil then exit;
- if (aObj.mGrid <> self) then raise Exception.Create('trying to remove alien proxy from grid');
- removeBody(aObj);
- //HACK!
- freeProxy(aObj);
- if (mProxyFree <> aObj) then raise Exception.Create('grid deletion invariant fucked');
- mProxyFree := aObj.nextLink;
- aObj.nextLink := nil;
-end;
-
-
-procedure TBodyGrid.moveResizeBody (body: TBodyProxy; dx, dy, sx, sy: Integer);
-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);
end;
-procedure TBodyGrid.moveBody (body: TBodyProxy; dx, dy: Integer);
-begin
- moveResizeBody(body, dx, dy, 0, 0);
-end;
+procedure TLineWalker.getXY (out ox, oy: Integer); inline; begin ox := xd; oy := yd; end;
-procedure TBodyGrid.resizeBody (body: TBodyProxy; sx, sy: Integer);
-begin
- moveResizeBody(body, 0, 0, sx, sy);
-end;
+// ////////////////////////////////////////////////////////////////////////// //
+function sweepAABB (mex0, mey0, mew, meh: Integer; medx, medy: Integer; itx0, ity0, itw, ith: Integer;
+ u0: PSingle=nil; hitedge: PInteger=nil; u1: PSingle=nil): Boolean;
+var
+ tin, tout: Single;
-function TBodyGrid.forEachInAABB (x, y, w, h: Integer; cb: GridQueryCB): Boolean;
- function iterator (grida: Integer): Boolean;
+ function axisOverlap (me0, me1, it0, it1, d, he0, he1: Integer): Boolean; inline;
var
- idx: Integer;
+ t: Single;
begin
result := false;
- idx := mGrid[grida];
- while idx >= 0 do
+
+ if (me1 < it0) then
begin
- if (mCells[idx].body <> nil) and (mCells[idx].body.mQueryMark <> mLastQuery) 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;
- end;
- idx := mCells[idx].next;
+ if (d >= 0) then exit; // oops, no hit
+ t := (me1-it0+1)/d;
+ if (t > tin) then begin tin := t; hitedge^ := he1; end;
+ end
+ else if (it1 < me0) then
+ begin
+ if (d <= 0) then exit; // oops, no hit
+ t := (me0-it1-1)/d;
+ if (t > tin) then begin tin := t; hitedge^ := he0; end;
end;
+
+ if (d < 0) and (it1 > me0) then
+ begin
+ t := (me0-it1-1)/d;
+ if (t < tout) then tout := t;
+ end
+ else if (d > 0) and (me1 > it0) then
+ begin
+ t := (me1-it0+1)/d;
+ if (t < tout) then tout := t;
+ end;
+
+ result := true;
end;
var
- idx: Integer;
+ mex1, mey1, itx1, ity1, vx, vy: Integer;
+ htt: Integer = -1;
begin
result := false;
- if not assigned(cb) then exit;
+ if (u0 <> nil) then u0^ := -1.0;
+ if (u1 <> nil) then u1^ := -1.0;
+ if (hitedge = nil) then hitedge := @htt else hitedge^ := -1;
- // increase query counter
- Inc(mLastQuery);
- if (mLastQuery = 0) 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;
- end;
- //e_WriteLog(Format('grid: query #%d: (%d,%d)-(%dx%d)', [mLastQuery, minx, miny, maxx, maxy]), MSG_NOTIFY);
+ if (mew < 1) or (meh < 1) or (itw < 1) or (ith < 1) then exit;
- result := forGridRect(x, y, w, h, iterator);
-end;
+ mex1 := mex0+mew-1;
+ mey1 := mey0+meh-1;
+ itx1 := itx0+itw-1;
+ ity1 := ity0+ith-1;
+ // check if they are overlapping right now (SAT)
+ //if (mex1 >= itx0) and (mex0 <= itx1) and (mey1 >= ity0) and (mey0 <= ity1) then begin result := true; exit; end;
-function TBodyGrid.getProxyForBody (aObj: TObject; x, y, w, h: Integer): TBodyProxy;
-var
- res: TBodyProxy = nil;
+ if (medx = 0) and (medy = 0) then exit; // both boxes are sationary
- function iterator (grida: Integer): Boolean;
- var
- idx: Integer;
+ // treat b as stationary, so invert v to get relative velocity
+ vx := -medx;
+ vy := -medy;
+
+ tin := -100000000.0;
+ tout := 100000000.0;
+
+ if not axisOverlap(mex0, mex1, itx0, itx1, vx, 1, 3) then exit;
+ if not axisOverlap(mey0, mey1, ity0, ity1, vy, 2, 0) then exit;
+
+ if (u0 <> nil) then u0^ := tin;
+ if (u1 <> nil) then u1^ := tout;
+
+ if (tin <= tout) and (tin >= 0.0) and (tin <= 1.0) then
begin
- result := false;
- idx := mGrid[grida];
- while idx >= 0 do
- begin
- if (mCells[idx].body <> nil) and (mCells[idx].body = aObj) then
- begin
- result := true;
- res := mCells[idx].body;
- exit;
- end;
- idx := mCells[idx].next;
- end;
+ result := true;
end;
-
-begin
- result := nil;
- if (aObj = nil) then exit;
- forGridRect(x, y, w, h, iterator);
- result := res;
end;
// ////////////////////////////////////////////////////////////////////////// //
-constructor TBinaryHeapObj.Create (alessfn: TBinaryHeapLessFn);
+procedure TBodyGridBase.TBodyProxyRec.setup (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer);
begin
- if not assigned(alessfn) then raise Exception.Create('wutafuck?!');
- lessfn := alessfn;
- SetLength(elem, 8192); // 'cause why not?
- elemUsed := 0;
+ mX := aX;
+ mY := aY;
+ mWidth := aWidth;
+ mHeight := aHeight;
+ mQueryMark := 0;
+ mObj := aObj;
+ mTag := aTag;
+ nextLink := -1;
end;
-destructor TBinaryHeapObj.Destroy ();
+function TBodyGridBase.TBodyProxyRec.getTag (): Integer; inline;
begin
- inherited;
+ result := mTag and TagFullMask;
end;
-
-procedure TBinaryHeapObj.clear ();
+procedure TBodyGridBase.TBodyProxyRec.setTag (v: Integer); inline;
begin
- elemUsed := 0;
+ mTag := (mTag and TagDisabled) or (v and TagFullMask);
end;
+function TBodyGridBase.TBodyProxyRec.getEnabled (): Boolean; inline;
+begin
+ result := ((mTag and TagDisabled) = 0);
+end;
-procedure TBinaryHeapObj.heapify (root: Integer);
-var
- smallest, right: Integer;
- tmp: TObject;
+procedure TBodyGridBase.TBodyProxyRec.setEnabled (v: Boolean); inline;
begin
- while true do
- begin
- smallest := 2*root+1; // left child
- if (smallest >= elemUsed) then break; // anyway
- right := smallest+1; // right child
- if not lessfn(elem[smallest], elem[root]) then smallest := root;
- if (right < elemUsed) and (lessfn(elem[right], elem[smallest])) then smallest := right;
- if (smallest = root) then break;
- // swap
- tmp := elem[root];
- elem[root] := elem[smallest];
- elem[smallest] := tmp;
- root := smallest;
- end;
+ if v then mTag := mTag and (not TagDisabled) else mTag := mTag or TagDisabled;
end;
+function TBodyGridBase.TBodyProxyRec.getX1 (): Integer; inline;
+begin
+ result := mX+mWidth-1;
+end;
-procedure TBinaryHeapObj.insert (val: TObject);
-var
- i, par: Integer;
+function TBodyGridBase.TBodyProxyRec.getY1 (): Integer; inline;
begin
- if (val = nil) then exit;
- i := elemUsed;
- if (i = Length(elem)) then SetLength(elem, Length(elem)+16384); // arbitrary number
- Inc(elemUsed);
- while (i <> 0) do
- begin
- par := (i-1) div 2; // parent
- if not lessfn(val, elem[par]) then break;
- elem[i] := elem[par];
- i := par;
- end;
- elem[i] := val;
+ result := mY+mHeight-1;
end;
-function TBinaryHeapObj.front (): TObject;
+
+// ////////////////////////////////////////////////////////////////////////// //
+constructor TBodyGridBase.TAtPointEnumerator.Create (acells: TCellArray; aidx: Integer; agetpx: TGetProxyFn);
begin
- if elemUsed > 0 then result := elem[0] else result := nil;
+ mCells := acells;
+ curidx := aidx;
+ curbki := -1;
+ getpx := agetpx;
end;
-procedure TBinaryHeapObj.popFront ();
+function TBodyGridBase.TAtPointEnumerator.MoveNext (): Boolean; inline;
begin
- if (elemUsed > 0) then
+ while (curidx <> -1) do
begin
- Dec(elemUsed);
- elem[0] := elem[elemUsed];
- heapify(0);
+ while (curbki < GridCellBucketSize) do
+ begin
+ Inc(curbki);
+ if (mCells[curidx].bodies[curbki] = -1) then break;
+ result := true;
+ exit;
+ end;
+ curidx := mCells[curidx].next;
+ curbki := -1;
end;
+ result := false;
+end;
+
+
+function TBodyGridBase.TAtPointEnumerator.getCurrent (): PBodyProxyRec; inline;
+begin
+ result := getpx(mCells[curidx].bodies[curbki]);
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+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
+ mTileSize := 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].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]), TMsgType.Notify);
+end;
+
+
+destructor TBodyGridBase.Destroy ();
+begin
+ mCells := nil;
+ mGrid := nil;
+ mProxies := nil;
+ inherited;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+procedure TBodyGridBase.dumpStats ();
+var
+ idx, mcb, ccidx, cnt: Integer;
+begin
+ mcb := 0;
+ for idx := 0 to High(mGrid) do
+ begin
+ ccidx := mGrid[idx];
+ cnt := 0;
+ while ccidx >= 0 do
+ begin
+ Inc(cnt);
+ ccidx := mCells[ccidx].next;
+ 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 bodies in cell: %d; max proxies allocated: %d; proxies used: %d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize, mUsedCells, mcb, mProxyMaxCount, mProxyCount]), TMsgType.Notify);
+end;
+
+
+procedure TBodyGridBase.forEachBodyCell (body: TBodyProxyId; cb: TCellQueryCB);
+var
+ g, f, ccidx: 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
+ ccidx := mGrid[g];
+ while (ccidx <> -1) do
+ begin
+ cc := @mCells[ccidx];
+ 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
+ ccidx := cc.next;
+ end;
+ end;
+end;
+
+
+function TBodyGridBase.forEachInCell (x, y: Integer; cb: TGridQueryCB): ITP;
+var
+ f, ccidx: 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;
+ ccidx := mGrid[(y div mTileSize)*mWidth+(x div mTileSize)];
+ while (ccidx <> -1) do
+ begin
+ cc := @mCells[ccidx];
+ 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
+ ccidx := 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) and (pid < Length(mProxies)) then result := ((mProxies[pid].mTag and TagDisabled) = 0) else result := false;
+end;
+
+
+procedure TBodyGridBase.setProxyEnabled (pid: TBodyProxyId; val: Boolean); inline;
+begin
+ if (pid >= 0) and (pid < Length(mProxies)) 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 TBodyGridBase.getProxyById (idx: TBodyProxyId): PBodyProxyRec; inline;
+begin
+ if (idx >= 0) and (idx < Length(mProxies)) then result := @mProxies[idx] else result := nil;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+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+32768); // arbitrary number
+ for idx := mFreeCell to High(mCells) do
+ begin
+ 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;
+ 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 TBodyGridBase.freeCell (idx: Integer);
+begin
+ if (idx >= 0) and (idx < Length(mCells)) then
+ begin
+ 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;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+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;
+var
+ gw, gh: Integer;
+ ex, ey: Integer;
+ gx, gy: 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;
+ if (x >= gw*mTileSize) or (y >= gh*mTileSize) then exit;
+ ex := (x+w-1) div mTileSize;
+ ey := (y+h-1) div mTileSize;
+ x := x div mTileSize;
+ y := y div mTileSize;
+ // clip rect
+ if (x < 0) then x := 0 else if (x >= gw) then x := gw-1;
+ if (y < 0) then y := 0 else if (y >= gh) then y := gh-1;
+ if (ex < 0) then ex := 0 else if (ex >= gw) then ex := gw-1;
+ if (ey < 0) then ey := 0 else if (ey >= gh) then ey := gh-1;
+ if (x > ex) or (y > ey) then exit; // just in case
+ // do the work
+ for gy := y to ey do
+ begin
+ for gx := x to ex do
+ begin
+ result := cb(gy*gw+gx, bodyId);
+ if result then exit;
+ end;
+ end;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.inserter (grida: Integer; bodyId: TBodyProxyId): Boolean;
+var
+ ccidx: 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)}
+ ccidx := pc;
+ while (ccidx <> -1) do
+ begin
+ pi := @mCells[ccidx];
+ 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;
+ ccidx := pi.next;
+ end;
+ {$ENDIF}
+ ccidx := pc;
+ while (ccidx <> -1) do
+ begin
+ pi := @mCells[ccidx];
+ // check "has room" flag
+ if (pi.bodies[GridCellBucketSize-1] = -1) then
+ begin
+ // can add here
+ for f := 0 to GridCellBucketSize-1 do
+ begin
+ if (pi.bodies[f] = -1) then
+ begin
+ pi.bodies[f] := bodyId;
+ if (f+1 < GridCellBucketSize) then pi.bodies[f+1] := -1;
+ exit;
+ end;
+ end;
+ raise Exception.Create('internal error in grid inserter');
+ end;
+ // no room, go to next cell in list (if there is any)
+ ccidx := pi.next;
+ end;
+ // no room in cells, add new cell to list
+ end;
+ // either no room, or no cell at all
+ ccidx := allocCell();
+ pi := @mCells[ccidx];
+ pi.bodies[0] := bodyId;
+ pi.bodies[1] := -1;
+ pi.next := pc;
+ mGrid[grida] := ccidx;
+end;
+
+
+// assume that we cannot have one object added to bucket twice
+function TBodyGridBase.remover (grida: Integer; bodyId: TBodyProxyId): Boolean;
+var
+ f, c: Integer;
+ pidx, ccidx: Integer;
+ pc: PGridCell;
+begin
+ result := false; // never stop
+ // find and remove cell
+ pidx := -1; // previous cell index
+ ccidx := mGrid[grida]; // current cell index
+ while (ccidx <> -1) do
+ begin
+ pc := @mCells[ccidx];
+ 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(ccidx);
+ 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 := ccidx;
+ ccidx := pc.next;
+ end;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.insertBody (aObj: ITP; aX, aY, aWidth, aHeight: Integer; aTag: Integer=-1): TBodyProxyId;
+begin
+ aTag := aTag and TagFullMask;
+ result := allocProxy(aX, aY, aWidth, aHeight, aObj, aTag);
+ //insertInternal(result);
+ forGridRect(aX, aY, aWidth, aHeight, inserter, result);
+end;
+
+
+procedure TBodyGridBase.removeBody (body: TBodyProxyId);
+var
+ px: PBodyProxyRec;
+begin
+ if (body < 0) or (body > High(mProxies)) then exit; // just in case
+ px := @mProxies[body];
+ //removeInternal(body);
+ forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover, body);
+ freeProxy(body);
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+procedure TBodyGridBase.moveResizeBody (body: TBodyProxyId; nx, ny, nw, nh: Integer);
+var
+ px: PBodyProxyRec;
+ x0, y0, w, h: Integer;
+begin
+ 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);
+ {$ENDIF}
+ if (nx = x0) and (ny = y0) and (nw = w) and (nh = h) then exit;
+ // map -> grid
+ Dec(x0, mMinX);
+ Dec(y0, mMinY);
+ Dec(nx, mMinX);
+ Dec(ny, mMinY);
+ // did any corner crossed tile boundary?
+ if (x0 div mTileSize <> nx div mTileSize) or
+ (y0 div mTileSize <> ny div mTileSize) or
+ ((x0+w-1) div mTileSize <> (nx+nw-1) div mTileSize) or
+ ((y0+h-1) div mTileSize <> (ny+nh-1) div mTileSize) then
+ begin
+ //writeln('moveResizeBody: cell occupation changed! old=(', x0, ',', y0, ')-(', x0+w-1, ',', y0+h-1, '); new=(', nx, ',', ny, ')-(', nx+nw-1, ',', ny+nh-1, ')');
+ //removeInternal(body);
+ forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover, body);
+ px.mX := nx+mMinX;
+ px.mY := ny+mMinY;
+ px.mWidth := nw;
+ px.mHeight := nh;
+ //insertInternal(body);
+ forGridRect(px.mX, px.mY, nw, nh, inserter, body);
+ end
+ else
+ begin
+ px.mX := nx+mMinX;
+ px.mY := ny+mMinY;
+ px.mWidth := nw;
+ px.mHeight := nh;
+ end;
+end;
+
+
+//TODO: optimize for horizontal/vertical moves
+procedure TBodyGridBase.moveBody (body: TBodyProxyId; nx, ny: Integer);
+var
+ px: PBodyProxyRec;
+ x0, y0: Integer;
+ ogx0, ogx1, ogy0, ogy1: Integer; // old grid rect
+ ngx0, ngx1, ngy0, ngy1: Integer; // new grid rect
+ gx, gy: Integer;
+ gw, gh: Integer;
+ pw, ph: Integer;
+begin
+ if (body < 0) or (body > High(mProxies)) then exit; // just in case
+ // check if tile coords was changed
+ px := @mProxies[body];
+ x0 := px.mX;
+ y0 := px.mY;
+ if (nx = x0) and (ny = y0) then exit;
+ // map -> grid
+ Dec(x0, mMinX);
+ Dec(y0, mMinY);
+ Dec(nx, mMinX);
+ Dec(ny, mMinY);
+ // check for heavy work
+ pw := px.mWidth;
+ ph := px.mHeight;
+ ogx0 := x0 div mTileSize;
+ ogy0 := y0 div mTileSize;
+ ngx0 := nx div mTileSize;
+ ngy0 := ny div mTileSize;
+ ogx1 := (x0+pw-1) div mTileSize;
+ ogy1 := (y0+ph-1) div mTileSize;
+ ngx1 := (nx+pw-1) div mTileSize;
+ ngy1 := (ny+ph-1) div mTileSize;
+ {$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);
+ {$ENDIF}
+ if (ogx0 <> ngx0) or (ogy0 <> ngy0) or (ogx1 <> ngx1) or (ogy1 <> ngy1) then
+ begin
+ // crossed tile boundary, do heavy work
+ gw := mWidth;
+ gh := mHeight;
+ // cycle with old rect, remove body where it is necessary
+ // optimized for horizontal moves
+ {$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);
+ {$ENDIF}
+ // remove stale marks
+ if not ((ogy0 >= gh) or (ogy1 < 0)) and
+ not ((ogx0 >= gw) or (ogx1 < 0)) then
+ begin
+ if (ogx0 < 0) then ogx0 := 0;
+ if (ogy0 < 0) then ogy0 := 0;
+ if (ogx1 > gw-1) then ogx1 := gw-1;
+ if (ogy1 > gh-1) then ogy1 := gh-1;
+ {$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);
+ {$ENDIF}
+ for gx := ngx0 to ngx1 do
+ begin
+ if (gx < ogx0) or (gx > ogx1) then
+ begin
+ // this column is completely outside of old rect
+ for gy := ngy0 to ngy1 do
+ begin
+ {$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);
+ {$ENDIF}
+ inserter(gy*gw+gx, body);
+ end;
+ end;
+ end;
+ end;
+ end;
+ // done
+ end
+ else
+ begin
+ {$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);
+ {$ENDIF}
+ end;
+ // update coordinates
+ px.mX := nx+mMinX;
+ px.mY := ny+mMinY;
+end;
+
+
+procedure TBodyGridBase.resizeBody (body: TBodyProxyId; nw, nh: Integer);
+var
+ px: PBodyProxyRec;
+ x0, y0, w, h: Integer;
+begin
+ if (body < 0) or (body > High(mProxies)) then exit; // just in case
+ // check if tile coords was changed
+ px := @mProxies[body];
+ x0 := px.mX-mMinX;
+ y0 := px.mY-mMinY;
+ w := px.mWidth;
+ h := px.mHeight;
+ {$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);
+ {$ENDIF}
+ if ((x0+w-1) div mTileSize <> (x0+nw-1) div mTileSize) or
+ ((y0+h-1) div mTileSize <> (y0+nh-1) div mTileSize) then
+ begin
+ // crossed tile boundary, do heavy work
+ //removeInternal(body);
+ forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover, body);
+ px.mWidth := nw;
+ px.mHeight := nh;
+ //insertInternal(body);
+ forGridRect(px.mX, px.mY, nw, nh, inserter, body);
+ end
+ else
+ begin
+ // nothing to do with the grid, just fix size
+ px.mWidth := nw;
+ px.mHeight := nh;
+ end;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.atCellInPoint (x, y: Integer): TAtPointEnumerator;
+var
+ ccidx: Integer = -1;
+begin
+ Dec(x, mMinX);
+ Dec(y, mMinY);
+ if (x >= 0) and (y >= 0) and (x < mWidth*mTileSize) and (y < mHeight*mTileSize) then ccidx := mGrid[(y div mTileSize)*mWidth+(x div mTileSize)];
+ result := TAtPointEnumerator.Create(mCells, ccidx, getProxyById);
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+// no callback: return `true` on the first hit
+function TBodyGridBase.forEachAtPoint (x, y: Integer; cb: TGridQueryCB; tagmask: Integer=-1; exittag: PInteger=nil): ITP;
+var
+ f: Integer;
+ idx, curci: Integer;
+ cc: PGridCell = nil;
+ px: PBodyProxyRec;
+ lq: LongWord;
+ ptag: Integer;
+begin
+ result := Default(ITP);
+ if (exittag <> nil) then exittag^ := 0;
+ tagmask := tagmask and TagFullMask;
+ if (tagmask = 0) then exit;
+
+ {$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;
+var
+ idx: Integer;
+ gx, gy: Integer;
+ sx, sy, ex, ey: Integer;
+ curci: Integer;
+ f: Integer;
+ cc: PGridCell = nil;
+ px: PBodyProxyRec;
+ lq: LongWord;
+ gw, gh: 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;
+ gh := mHeight;
+
+ if (x+w <= 0) or (y+h <= 0) then exit;
+ if (x >= gw*mTileSize) or (y >= gh*mTileSize) then exit;
+
+ sx := x div mTileSize;
+ sy := y div mTileSize;
+ ex := (x+w-1) div mTileSize;
+ ey := (y+h-1) div mTileSize;
+
+ // clip rect
+ if (sx < 0) then sx := 0 else if (sx >= gw) then sx := gw-1;
+ if (sy < 0) then sy := 0 else if (sy >= gh) then sy := gh-1;
+ if (ex < 0) then ex := 0 else if (ex >= gw) then ex := gw-1;
+ if (ey < 0) then ey := 0 else if (ey >= gh) then ey := gh-1;
+ if (sx > ex) or (sy > ey) then exit; // just in case
+
+ // has something to do
+ if mInQuery then raise Exception.Create('recursive queries aren''t supported');
+ mInQuery := true;
+
+ // 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 := sy to ey do
+ begin
+ for gx := sx to ex do
+ begin
+ // 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; mInQuery := false; exit; end;
+ end
+ else
+ begin
+ result := px.mObj;
+ mInQuery := false;
+ exit;
+ end;
+ end;
+ curci := cc.next;
+ end;
+ end;
+ end;
+
+ mInQuery := false;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.forEachAlongLine (ax0, ay0, ax1, ay1: Integer; cb: TGridQueryCB; tagmask: Integer=-1; log: Boolean=false): ITP;
+var
+ lw: TLineWalker;
+ ccidx: Integer;
+ cc: PGridCell;
+ px: PBodyProxyRec;
+ lq: LongWord;
+ f, ptag: Integer;
+ gw, gh, minx, miny: Integer;
+ x0, y0: Integer;
+ x1, y1: Integer;
+ cx, cy: Integer;
+ //px0, py0, px1, py1: Integer;
+begin
+ log := false;
+ result := Default(ITP);
+ tagmask := tagmask and TagFullMask;
+ if (tagmask = 0) or not assigned(cb) then exit;
+
+ gw := mWidth;
+ gh := mHeight;
+ minx := mMinX;
+ miny := mMinY;
+
+ // make query coords (0,0)-based
+ x0 := ax0-minx;
+ y0 := ay0-miny;
+ x1 := ax1-minx;
+ y1 := ay1-miny;
+
+ lw := TLineWalker.Create(0, 0, gw*mTileSize-1, gh*mTileSize-1);
+ if not lw.setup(x0, y0, x1, y1) then exit; // out of screen
+
+ if mInQuery then raise Exception.Create('recursive queries aren''t supported');
+ mInQuery := true;
+
+ // 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;
+
+ repeat
+ lw.getXY(cx, cy);
+ // check tile
+ ccidx := mGrid[(cy div mTileSize)*gw+(cx div mTileSize)];
+ // process cells
+ while (ccidx <> -1) do
+ begin
+ cc := @mCells[ccidx];
+ 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;
+ mInQuery := false;
+ exit;
+ end;
+ end;
+ end;
+ // next cell
+ ccidx := cc.next;
+ end;
+ // done processing cells, move to next tile
+ until lw.stepToNextTile();
+
+ mInQuery := false;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+// trace box with the given velocity; return object hit (if any)
+// `cb` is used unconvetionally here: if it returns `false`, tracer will ignore the object
+function TBodyGridBase.traceBox (out ex, ey: Integer; const ax0, ay0, aw, ah: Integer; const dx, dy: Integer; cb: TGridQueryCB; tagmask: Integer=-1): ITP;
+var
+ gx, gy: Integer;
+ ccidx: Integer;
+ cc: PGridCell;
+ px: PBodyProxyRec;
+ lq: LongWord;
+ f, ptag: Integer;
+ minu0: Single = 100000.0;
+ u0: Single;
+ cx0, cy0, cx1, cy1: Integer;
+ hitpx: PBodyProxyRec = nil;
+begin
+ result := Default(ITP);
+ ex := ax0+dx;
+ ey := ay0+dy;
+ if (aw < 1) or (ah < 1) then exit;
+
+ cx0 := nmin(ax0, ax0+dx);
+ cy0 := nmin(ay0, ay0+dy);
+ cx1 := nmax(ax0+aw-1, ax0+aw-1+dx);
+ cy1 := nmax(ay0+ah-1, ay0+ah-1+dy);
+
+ cx0 -= mMinX; cy0 -= mMinY;
+ cx1 -= mMinX; cy1 -= mMinY;
+
+ if (cx1 < 0) or (cy1 < 0) or (cx0 >= mWidth*mTileSize) or (cy0 >= mHeight*mTileSize) then exit;
+
+ if (cx0 < 0) then cx0 := 0;
+ if (cy0 < 0) then cy0 := 0;
+ if (cx1 >= mWidth*mTileSize) then cx1 := mWidth*mTileSize-1;
+ if (cy1 >= mHeight*mTileSize) then cy1 := mHeight*mTileSize-1;
+ // just in case
+ if (cx0 > cx1) or (cy0 > cy1) then exit;
+
+ if mInQuery then raise Exception.Create('recursive queries aren''t supported');
+ mInQuery := true;
+
+ // 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;
+
+ for gy := cy0 div mTileSize to cy1 div mTileSize do
+ begin
+ for gx := cx0 div mTileSize to cx1 div mTileSize do
+ begin
+ ccidx := mGrid[gy*mWidth+gx];
+ while (ccidx <> -1) do
+ begin
+ cc := @mCells[ccidx];
+ 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 assigned(cb) then
+ begin
+ if not cb(px.mObj, ptag) then continue;
+ end;
+ if not sweepAABB(ax0, ay0, aw, ah, dx, dy, px.mX, px.mY, px.mWidth, px.mHeight, @u0) then continue;
+ if (minu0 > u0) then
+ begin
+ hitpx := px;
+ result := px.mObj;
+ minu0 := u0;
+ if (u0 = 0.0) then
+ begin
+ ex := ax0;
+ ey := ay0;
+ mInQuery := false;
+ exit;
+ end;
+ end;
+ end;
+ end;
+ // next cell
+ ccidx := cc.next;
+ end;
+ end;
+ end;
+
+ if (minu0 <= 1.0) then
+ begin
+ ex := ax0+round(dx*minu0);
+ ey := ay0+round(dy*minu0);
+ // just in case, compensate for floating point inexactness
+ if (ex >= hitpx.mX) and (ey >= hitpx.mY) and (ex < hitpx.mX+hitpx.mWidth) and (ey < hitpx.mY+hitpx.mHeight) then
+ begin
+ ex := ax0+trunc(dx*minu0);
+ ey := ay0+trunc(dy*minu0);
+ end;
+ end;
+
+ mInQuery := false;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+{.$DEFINE D2F_DEBUG_OTR}
+function TBodyGridBase.traceOrthoRayWhileIn (out ex, ey: Integer; ax0, ay0, ax1, ay1: Integer; tagmask: Integer=-1): Boolean;
+var
+ ccidx: Integer;
+ cc: PGridCell;
+ px: PBodyProxyRec;
+ ptag: Integer;
+ minx, miny: Integer;
+ f, c0, c1: Integer;
+ x0, y0, x1, y1: Integer;
+ celly0, celly1: Integer;
+ dy: Integer;
+ filled: array[0..mTileSize-1] of Byte;
+ {$IF DEFINED(D2F_DEBUG_OTR)}
+ s: AnsiString = '';
+ {$ENDIF}
+begin
+ result := false;
+ ex := ax1;
+ ey := ay1;
+ if not ((ax0 = ax1) or (ay0 = ay1)) then raise Exception.Create('orthoray is not orthogonal');
+
+ tagmask := tagmask and TagFullMask;
+ if (tagmask = 0) then exit;
+
+ if (forEachAtPoint(ax0, ay0, nil, tagmask) = nil) then exit;
+
+ minx := mMinX;
+ miny := mMinY;
+
+ // offset query coords to (0,0)-based
+ x0 := ax0-minx;
+ y0 := ay0-miny;
+ x1 := ax1-minx;
+ y1 := ay1-miny;
+
+ if (x0 = x1) then
+ begin
+ if (x0 < 0) or (x0 >= mWidth*mTileSize) then exit; // oops
+ // vertical
+ if (y0 < y1) then
+ begin
+ // down
+ if (y1 < 0) or (y0 >= mHeight*mTileSize) then exit;
+ //if (ay0 < 0) then ay0 := 0;
+ if (y0 < 0) then exit;
+ if (y1 >= mHeight*mTileSize) then y1 := mHeight*mTileSize-1;
+ dy := 1;
+ end
+ else
+ begin
+ // up
+ if (y0 < 0) or (y1 >= mHeight*mTileSize) then exit;
+ //if (ay1 < 0) then ay1 := 0;
+ if (y1 < 0) then exit;
+ if (y0 >= mHeight*mTileSize) then y0 := mHeight*mTileSize-1;
+ dy := -1;
+ end;
+ // check tile
+ while true do
+ begin
+ ccidx := mGrid[(y0 div mTileSize)*mWidth+(x0 div mTileSize)];
+ FillChar(filled, sizeof(filled), 0);
+ celly0 := y0 and (not (mTileSize-1));
+ celly1 := celly0+mTileSize-1;
+ while (ccidx <> -1) do
+ begin
+ cc := @mCells[ccidx];
+ 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
+ (ax0 >= px.x0) and (ax0 <= px.x1) then
+ begin
+ // bound c0 and c1 to cell
+ c0 := nclamp(px.y0-miny, celly0, celly1);
+ c1 := nclamp(px.y1-miny, celly0, celly1);
+ // fill the thing
+ {$IF DEFINED(D2F_DEBUG_OTR)}
+ e_LogWritefln('**px.y0=%s; px.y1=%s; c0=%s; c1=%s; celly0=%s; celly1=%s; [%s..%s]', [px.y0-miny, px.y1-miny, c0, c1, celly0, celly1, c0-celly0, (c0-celly0)+(c1-c0)]);
+ {$ENDIF}
+ //assert(c0 <= c1);
+ FillChar(filled[c0-celly0], c1-c0+1, 1);
+ end;
+ end;
+ // next cell
+ ccidx := cc.next;
+ end;
+ {$IF DEFINED(D2F_DEBUG_OTR)}
+ s := formatstrf(' x=%s; ay0=%s; ay1=%s; y0=%s; celly0=%s; celly1=%s; dy=%s; [', [ax0, ay0, ay1, y0, celly0, celly1, dy]);
+ for f := 0 to High(filled) do if (filled[f] <> 0) then s += '1' else s += '0';
+ s += ']';
+ e_LogWriteln(s);
+ {$ENDIF}
+ // now go till we hit cell boundary or empty space
+ if (dy < 0) then
+ begin
+ // up
+ while (y0 >= celly0) and (filled[y0-celly0] <> 0) do
+ begin
+ {$IF DEFINED(D2F_DEBUG_OTR)}
+ e_LogWritefln(' filled: cdy=%s; y0=%s; celly0=%s; ay0=%s; ay1=%s', [y0-celly0, y0, celly0, ay0, ay1]);
+ {$ENDIF}
+ Dec(y0);
+ Dec(ay0);
+ end;
+ {$IF DEFINED(D2F_DEBUG_OTR)}
+ e_LogWritefln(' span done: cdy=%s; y0=%s; celly0=%s; ay0=%s; ay1=%s', [y0-celly0, y0, celly0, ay0, ay1]);
+ {$ENDIF}
+ if (ay0 <= ay1) then begin ey := ay1; result := false; exit; end;
+ if (y0 >= celly0) then begin ey := ay0+1; {assert(forEachAtPoint(ex, ey, nil, tagmask) <> nil);} result := true; exit; end;
+ end
+ else
+ begin
+ // down
+ while (y0 <= celly1) and (filled[y0-celly0] <> 0) do begin Inc(y0); Inc(ay0); end;
+ if (ay0 >= ay1) then begin ey := ay1; result := false; exit; end;
+ if (y0 <= celly1) then begin ey := ay0-1; result := true; exit; end;
+ end;
+ end;
+ end
+ else
+ begin
+ // horizontal
+ assert(false);
+ end;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.traceRay (const x0, y0, x1, y1: Integer; cb: TGridQueryCB; 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: TGridQueryCB; tagmask: Integer=-1): ITP;
+var
+ lw: TLineWalker;
+ ccidx: Integer;
+ cc: PGridCell;
+ px: PBodyProxyRec;
+ lq: LongWord;
+ f, ptag: Integer;
+ gw, gh, minx, miny: Integer;
+ x0, y0: Integer;
+ x1, y1: Integer;
+ cx, cy: Integer;
+ px0, py0, px1, py1: Integer;
+ lastDistSq, distSq, hx, hy: Integer;
+ firstCell: Boolean = true;
+ wasHit: Boolean;
+begin
+ result := Default(ITP);
+ tagmask := tagmask and TagFullMask;
+ if (tagmask = 0) then exit;
+
+ gw := mWidth;
+ gh := mHeight;
+ minx := mMinX;
+ miny := mMinY;
+
+ // make query coords (0,0)-based
+ x0 := ax0-minx;
+ y0 := ay0-miny;
+ x1 := ax1-minx;
+ y1 := ay1-miny;
+
+ lw := TLineWalker.Create(0, 0, gw*mTileSize-1, gh*mTileSize-1);
+ if not lw.setup(x0, y0, x1, y1) then exit; // out of screen
+
+ lastDistSq := distanceSq(ax0, ay0, ax1, ay1)+1;
+
+ {$IF DEFINED(D2F_DEBUG)}
+ //if assigned(dbgRayTraceTileHitCB) then e_LogWritefln('*** traceRay: (%s,%s)-(%s,%s)', [x0, y0, x1, y1]);
+ {$ENDIF}
+
+ if mInQuery then raise Exception.Create('recursive queries aren''t supported');
+ mInQuery := true;
+
+ // 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;
+
+ repeat
+ lw.getXY(cx, cy);
+ {$IF DEFINED(D2F_DEBUG)}
+ if assigned(dbgRayTraceTileHitCB) then dbgRayTraceTileHitCB(cx+mMinX, cy+mMinY);
+ {$ENDIF}
+ // check tile
+ ccidx := mGrid[(cy div mTileSize)*gw+(cx div mTileSize)];
+ // process cells
+ wasHit := false;
+ while (ccidx <> -1) do
+ begin
+ cc := @mCells[ccidx];
+ 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 assigned(cb) then
+ begin
+ if not cb(px.mObj, ptag) then continue;
+ end;
+ // get adjusted proxy coords
+ px0 := px.mX-minx;
+ py0 := px.mY-miny;
+ px1 := px0+px.mWidth-1;
+ py1 := py0+px.mHeight-1;
+ {$IF DEFINED(D2F_DEBUG)}
+ //if assigned(dbgRayTraceTileHitCB) then e_LogWritefln(' cxy=(%s,%s); pan=(%s,%s)-(%s,%s)', [cx, cy, px0, py0, px1, py1]);
+ {$ENDIF}
+ // inside?
+ if firstCell and (x0 >= px0) and (y0 >= py0) and (x0 <= px1) and (y0 <= py1) then
+ begin
+ // oops
+ ex := ax0;
+ ey := ay0;
+ result := px.mObj;
+ mInQuery := false;
+ {$IF DEFINED(D2F_DEBUG)}
+ if assigned(dbgRayTraceTileHitCB) then e_LogWriteln(' INSIDE!');
+ {$ENDIF}
+ exit;
+ end;
+ // do line-vs-aabb test
+ if lineAABBIntersects(x0, y0, x1, y1, px0, py0, px1-px0+1, py1-py0+1, hx, hy) then
+ begin
+ // hit detected
+ distSq := distanceSq(x0, y0, hx, hy);
+ {$IF DEFINED(D2F_DEBUG)}
+ //if assigned(dbgRayTraceTileHitCB) then e_LogWritefln(' hit=(%s,%s); distSq=%s; lastDistSq=%s', [hx, hy, distSq, lastDistSq]);
+ {$ENDIF}
+ if (distSq < lastDistSq) then
+ begin
+ lastDistSq := distSq;
+ ex := hx+minx;
+ ey := hy+miny;
+ result := px.mObj;
+ wasHit := true;
+ end;
+ end;
+ end;
+ end;
+ // next cell
+ ccidx := cc.next;
+ end;
+ // done processing cells; exit if we registered a hit
+ // next cells can't have better candidates, obviously
+ if wasHit then begin mInQuery := false; exit; end;
+ firstCell := false;
+ // move to next tile
+ until lw.stepToNextTile();
+
+ mInQuery := false;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+// no callback: return `true` on the nearest hit
+function TBodyGridBase.traceRayOld (const x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP;
+var
+ ex, ey: Integer;
+begin
+ result := traceRayOld(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.traceRayOld (out ex, ey: Integer; const ax0, ay0, ax1, ay1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP;
+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;
+ //swapped: Boolean = false; // true: xd is yd, and vice versa
+ // horizontal walker
+ {$IFDEF GRID_USE_ORTHO_ACCEL}
+ wklen, wkstep: Integer;
+ //wksign: Integer;
+ hopt: Boolean;
+ {$ENDIF}
+ // skipper
+ xdist, ydist: 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*mTileSize-1;
+ maxy := gh*mTileSize-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
+ //swapped := true;
+ 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; //BUGGY
+ if (xd < wx0) then begin xd += 1; 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
+ //FIXME!
+ 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;
+ *)
+
+ {$IF DEFINED(D2F_DEBUG)}
+ if (xptr^ < 0) or (yptr^ < 0) or (xptr^ >= gw*mTileSize) and (yptr^ >= gh*mTileSize) then raise Exception.Create('raycaster internal error (0)');
+ {$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 (dbgShowTraceLog) then e_WriteLog(Format('raycast start: (%d,%d)-(%d,%d); xptr^=%d; yptr^=%d', [ax0, ay0, ax1, ay1, xptr^, yptr^]), MSG_NOTIFY);
+
+ if mInQuery then raise Exception.Create('recursive queries aren''t supported');
+ mInQuery := true;
+
+ // 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;
+
+ {$IFDEF GRID_USE_ORTHO_ACCEL}
+ // if this is strict horizontal/vertical trace, use optimized codepath
+ if (ax0 = ax1) or (ay0 = ay1) then
+ begin
+ // horizontal trace: walk the whole tiles, calculating mindist once for each proxy in cell
+ // stx < 0: going left, otherwise `stx` is > 0, and we're going right
+ // vertical trace: walk the whole tiles, calculating mindist once for each proxy in cell
+ // stx < 0: going up, otherwise `stx` is > 0, and we're going down
+ hopt := (ay0 = ay1); // horizontal?
+ if (stx < 0) then begin {wksign := -1;} wklen := -(term-xd); end else begin {wksign := 1;} wklen := term-xd; end;
+ {$IF DEFINED(D2F_DEBUG)}
+ if dbgShowTraceLog then e_LogWritefln('optimized htrace; wklen=%d', [wklen]);
+ {$ENDIF}
+ ga := (yptr^ div mTileSize)*gw+(xptr^ div mTileSize);
+ // one of those will never change
+ x := xptr^+minx;
+ y := yptr^+miny;
+ while (wklen > 0) do
+ begin
+ {$IF DEFINED(D2F_DEBUG)}
+ if dbgShowTraceLog then e_LogWritefln(' htrace; ga=%d; x=%d, y=%d; y=%d; y=%d', [ga, xptr^+minx, yptr^+miny, y, ay0]);
+ {$ENDIF}
+ // new tile?
+ if (ga <> lastGA) then
+ begin
+ lastGA := ga;
+ ccidx := mGrid[lastGA];
+ // convert coords to map (to avoid ajdusting coords inside the loop)
+ if hopt then x := xptr^+minx else y := yptr^+miny;
+ while (ccidx <> -1) do
+ begin
+ cc := @mCells[ccidx];
+ for f := 0 to GridCellBucketSize-1 do
+ begin
+ if (cc.bodies[f] = -1) then break;
+ px := @mProxies[cc.bodies[f]];
+ ptag := px.mTag;
+ if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) and
+ // constant coord should be inside
+ ((hopt and (y >= px.y0) and (y <= px.y1)) or
+ ((not hopt) and (x >= px.x0) and (x <= px.x1))) then
+ begin
+ px.mQueryMark := lq; // mark as processed
+ // inside the proxy?
+ if (hopt and (x > px.x0) and (x < px.x1)) or
+ ((not hopt) and (y > px.y0) and (y < px.y1)) then
+ begin
+ // setup prev[xy]
+ if assigned(cb) then
+ begin
+ if cb(px.mObj, ptag, x, y, x, y) then
+ begin
+ result := px.mObj;
+ ex := x;
+ ey := y;
+ mInQuery := false;
+ exit;
+ end;
+ end
+ else
+ begin
+ distSq := distanceSq(ax0, ay0, x, y);
+ {$IF DEFINED(D2F_DEBUG)}
+ if dbgShowTraceLog then e_LogWritefln(' EMBEDDED hhit(%d): a=(%d,%d), h=(%d,%d), distsq=%d; lastsq=%d', [cc.bodies[f], ax0, ay0, x, y, distSq, lastDistSq]);
+ {$ENDIF}
+ if (distSq < lastDistSq) then
+ begin
+ ex := x;
+ ey := y;
+ result := px.mObj;
+ mInQuery := false;
+ exit;
+ end;
+ end;
+ continue;
+ end;
+ // remember this hitpoint if it is nearer than an old one
+ // setup prev[xy]
+ if hopt then
+ begin
+ // horizontal trace
+ prevy := y;
+ y := yptr^+miny;
+ if (stx < 0) then
+ begin
+ // going left
+ if (x < px.x1) then continue; // not on the right edge
+ x := px.x1;
+ prevx := x+1;
+ end
+ else
+ begin
+ // going right
+ if (x > px.x0) then continue; // not on the left edge
+ x := px.x0;
+ prevx := x-1;
+ end;
+ end
+ else
+ begin
+ // vertical trace
+ prevx := x;
+ x := xptr^+minx;
+ if (stx < 0) then
+ begin
+ // going up
+ if (y < px.y1) then continue; // not on the bottom edge
+ y := px.y1;
+ prevy := x+1;
+ end
+ else
+ begin
+ // going down
+ if (y > px.y0) then continue; // not on the top edge
+ y := px.y0;
+ prevy := y-1;
+ end;
+ end;
+ if assigned(cb) then
+ begin
+ if cb(px.mObj, ptag, x, y, prevx, prevy) then
+ begin
+ result := px.mObj;
+ ex := prevx;
+ ey := prevy;
+ mInQuery := false;
+ exit;
+ end;
+ end
+ else
+ begin
+ distSq := distanceSq(ax0, ay0, prevx, prevy);
+ {$IF DEFINED(D2F_DEBUG)}
+ if dbgShowTraceLog then e_LogWritefln(' hhit(%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]);
+ {$ENDIF}
+ if (distSq < lastDistSq) then
+ begin
+ wasHit := true;
+ lastDistSq := distSq;
+ ex := prevx;
+ ey := prevy;
+ lastObj := px.mObj;
+ end;
+ end;
+ end;
+ end;
+ // next cell
+ ccidx := cc.next;
+ end;
+ if wasHit and not assigned(cb) then begin result := lastObj; mInQuery := false; exit; end;
+ if assigned(cb) and cb(nil, 0, x, y, x, y) then begin result := lastObj; mInQuery := false; exit; end;
+ end;
+ // skip to next tile
+ if hopt then
+ begin
+ if (stx > 0) then
+ begin
+ // to the right
+ wkstep := ((xptr^ or (mTileSize-1))+1)-xptr^;
+ {$IF DEFINED(D2F_DEBUG)}
+ if dbgShowTraceLog then e_LogWritefln(' right step: wklen=%d; wkstep=%d', [wklen, wkstep]);
+ {$ENDIF}
+ if (wkstep >= wklen) then break;
+ Inc(xptr^, wkstep);
+ Inc(ga);
+ end
+ else
+ begin
+ // to the left
+ wkstep := xptr^-((xptr^ and (not (mTileSize-1)))-1);
+ {$IF DEFINED(D2F_DEBUG)}
+ if dbgShowTraceLog then e_LogWritefln(' left step: wklen=%d; wkstep=%d', [wklen, wkstep]);
+ {$ENDIF}
+ if (wkstep >= wklen) then break;
+ Dec(xptr^, wkstep);
+ Dec(ga);
+ end;
+ end
+ else
+ begin
+ if (stx > 0) then
+ begin
+ // to the down
+ wkstep := ((yptr^ or (mTileSize-1))+1)-yptr^;
+ {$IF DEFINED(D2F_DEBUG)}
+ if dbgShowTraceLog then e_LogWritefln(' down step: wklen=%d; wkstep=%d', [wklen, wkstep]);
+ {$ENDIF}
+ if (wkstep >= wklen) then break;
+ Inc(yptr^, wkstep);
+ Inc(ga, mWidth);
+ end
+ else
+ begin
+ // to the up
+ wkstep := yptr^-((yptr^ and (not (mTileSize-1)))-1);
+ {$IF DEFINED(D2F_DEBUG)}
+ if dbgShowTraceLog then e_LogWritefln(' up step: wklen=%d; wkstep=%d', [wklen, wkstep]);
+ {$ENDIF}
+ if (wkstep >= wklen) then break;
+ Dec(yptr^, wkstep);
+ Dec(ga, mWidth);
+ end;
+ end;
+ Dec(wklen, wkstep);
+ end;
+ // we can travel less than one cell
+ if wasHit and not assigned(cb) then result := lastObj else begin ex := ax1; ey := ay1; end;
+ mInQuery := false;
+ exit;
+ end;
+ {$ENDIF}
+
+ {$IF DEFINED(D2F_DEBUG_RAYTRACE)}
+ if assigned(dbgRayTraceTileHitCB) then dbgRayTraceTileHitCB((xptr^ div mTileSize*mTileSize)+minx, (yptr^ div mTileSize*mTileSize)+miny);
+ {$ENDIF}
+
+ //e_LogWritefln('*********************', []);
+ ccidx := -1;
+ // can omit checks
+ while (xd <> term) do
+ begin
+ // check cell(s)
+ {$IF DEFINED(D2F_DEBUG)}
+ if (xptr^ < 0) or (yptr^ < 0) or (xptr^ >= gw*mTileSize) and (yptr^ >= gh*mTileSize) then raise Exception.Create('raycaster internal error (0)');
+ {$ENDIF}
+ // new tile?
+ ga := (yptr^ div mTileSize)*gw+(xptr^ div mTileSize);
+ {$IF DEFINED(D2F_DEBUG_RAYTRACE)}
+ if assigned(dbgRayTraceTileHitCB) then e_WriteLog(Format(' xd=%d; term=%d; gx=%d; gy=%d; ga=%d; lastga=%d', [xd, term, xptr^, yptr^, ga, lastGA]), MSG_NOTIFY);
+ {$ENDIF}
+ if (ga <> lastGA) then
+ begin
+ // yes
+ {$IF DEFINED(D2F_DEBUG)}
+ if assigned(dbgRayTraceTileHitCB) then dbgRayTraceTileHitCB((xptr^ div mTileSize*mTileSize)+minx, (yptr^ div mTileSize*mTileSize)+miny);
+ {$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; mInQuery := false; exit; end;
+ end
+ else if wasHit then
+ begin
+ result := lastObj;
+ mInQuery := false;
+ 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 := px.mObj;
+ ex := prevx;
+ ey := prevy;
+ mInQuery := false;
+ exit;
+ end;
+ 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; mInQuery := false; exit; end;
+ end
+ else if wasHit then
+ begin
+ result := lastObj;
+ mInQuery := false;
+ exit;
+ end;
+ end;
+ end;
+ if (ccidx = -1) then
+ begin
+ // move to cell edge, as we have nothing to trace here anymore
+ if (stx < 0) then xdist := xd and (not (mTileSize-1)) else xdist := xd or (mTileSize-1);
+ if (sty < 0) then ydist := yd and (not (mTileSize-1)) else ydist := yd or (mTileSize-1);
+ //e_LogWritefln('0: swapped=%d; xd=%d; yd=%d; stx=%d; sty=%d; e=%d; dx2=%d; dy2=%d; term=%d; xdist=%d; ydist=%d', [swapped, xd, yd, stx, sty, e, dx2, dy2, term, xdist, ydist]);
+ while (xd <> xdist) and (yd <> ydist) do
+ begin
+ // step
+ xd += stx;
+ if (e >= 0) then begin yd += sty; e -= dx2; end else e += dy2;
+ //e_LogWritefln(' xd=%d; yd=%d', [xd, yd]);
+ if (xd = term) then break;
+ end;
+ //e_LogWritefln('1: swapped=%d; xd=%d; yd=%d; stx=%d; sty=%d; e=%d; dx2=%d; dy2=%d; term=%d; xdist=%d; ydist=%d', [swapped, xd, yd, stx, sty, e, dx2, dy2, term, xdist, ydist]);
+ if (xd = term) then break;
+ 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;
+
+ mInQuery := false;
end;