diff --git a/src/game/g_grid.pas b/src/game/g_grid.pas
index 56d8ecbc42bbebf2ac1c9075c588b5725f68f227..c6fe09534a639f958ca7c300f354120d08a9eee7 100644 (file)
--- a/src/game/g_grid.pas
+++ b/src/game/g_grid.pas
interface
-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
- TBodyProxy = Integer;
+ const TagDisabled = $40000000;
+ const TagFullMask = $3fffffff;
- PBodyProxyRec = ^TBodyProxyRec;
- TBodyProxyRec = record
private
- mX, mY, mWidth, mHeight: Integer; // aabb
- mQueryMark: DWord; // was this object visited at this query?
- mObj: TObject;
- //mGrid: TBodyGrid;
- mTag: Integer;
- nextLink: TBodyProxy; // next free or nothing
+ const
+ GridDefaultTileSize = 32; // must be power of two!
+ GridCellBucketSize = 8; // WARNING! can't be less than 2!
private
- procedure setup (aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
+ 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);
+ end;
- public
- //constructor Create (aGrid: TBodyGrid; aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
- //destructor Destroy (); override;
+ PGridCell = ^TGridCell;
+ TGridCell = record
+ bodies: array [0..GridCellBucketSize-1] of Integer; // -1: end of list
+ next: Integer; // in this cell; index in mCells
+ 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;
+ TGridInternalCB = function (grida: Integer; bodyId: TBodyProxyId): Boolean of object; // return `true` to stop
- PGridCell = ^TGridCell;
- TGridCell = record
- body: Integer;
- next: Integer; // in this cell; index in mCells
- end;
+ private
+ //mTileSize: Integer;
+ const mTileSize = GridDefaultTileSize;
- GridInternalCB = function (grida: Integer): Boolean is nested; // return `true` to stop
+ 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: DWord;
+ mLastQuery: LongWord;
mUsedCells: Integer;
mProxies: array of TBodyProxyRec;
- mProxyFree: TBodyProxy; // free
+ mProxyFree: TBodyProxyId; // free
mProxyCount: Integer; // currently used
mProxyMaxCount: Integer;
+ public
+ dbgShowTraceLog: Boolean;
+
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);
+
+ 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;
- procedure insert (body: TBodyProxy);
- procedure remove (body: TBodyProxy);
+ function getProxyEnabled (pid: TBodyProxyId): Boolean; inline;
+ procedure setProxyEnabled (pid: TBodyProxyId; val: Boolean); inline;
- function forGridRect (x, y, w, h: Integer; cb: GridInternalCB): Boolean;
+ function getGridWidthPx (): Integer; inline;
+ function getGridHeightPx (): Integer; inline;
public
- constructor Create (aMinPixX, aMinPixY, 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 destroy proxy!
+ 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: TBodyProxy; dx, dy: Integer);
- procedure resizeBody (body: TBodyProxy; sx, sy: Integer);
- procedure moveResizeBody (body: TBodyProxy; dx, dy, sx, sy: Integer);
+ procedure moveBody (body: TBodyProxyId; nx, ny: Integer);
+ procedure resizeBody (body: TBodyProxyId; nw, nh: Integer);
+ procedure moveResizeBody (body: TBodyProxyId; nx, ny, nw, nh: Integer);
- function forEachInAABB (x, y, w, h: Integer; cb: GridQueryCB): Boolean;
+ function insideGrid (x, y: Integer): Boolean; inline;
- function getProxyForBody (aObj: TObject; x, y, w, h: Integer): TBodyProxy;
+ // `false` if `body` is surely invalid
+ function getBodyXY (body: TBodyProxyId; out rx, ry: 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 `true` on the first hit
+ function forEachAtPoint (x, y: Integer; cb: TGridQueryCB; 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 `true` on the nearest hit
+ function traceRay (x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP; overload;
+ function traceRay (out ex, ey: Integer; 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)
+ // trace line along the grid, calling `cb` for all objects in passed cells, in no particular order
+ function forEachAlongLine (x0, y0, x1, y1: Integer; cb: TGridAlongQueryCB; tagmask: Integer=-1; log: Boolean=false): 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
// ////////////////////////////////////////////////////////////////////////// //
-procedure TBodyProxyRec.setup (aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
+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;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+procedure TBodyGridBase.TBodyProxyRec.setup (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer);
begin
mX := aX;
mY := aY;
// ////////////////////////////////////////////////////////////////////////// //
-constructor TBodyGrid.Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
+constructor TBodyGridBase.Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer{; aTileSize: Integer=GridDefaultTileSize});
var
idx: Integer;
begin
+ dbgShowTraceLog := false;
+ {
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;
+ }
+ if (aPixWidth < mTileSize) then aPixWidth := mTileSize;
+ if (aPixHeight < mTileSize) then aPixHeight := mTileSize;
mMinX := aMinPixX;
mMinY := aMinPixY;
- mWidth := (aPixWidth+aTileSize-1) div aTileSize;
- mHeight := (aPixHeight+aTileSize-1) div aTileSize;
+ mWidth := (aPixWidth+mTileSize-1) div mTileSize;
+ mHeight := (aPixHeight+mTileSize-1) div mTileSize;
SetLength(mGrid, mWidth*mHeight);
SetLength(mCells, mWidth*mHeight);
SetLength(mProxies, 8192);
// init free list
for idx := 0 to High(mCells) do
begin
- mCells[idx].body := -1;
+ mCells[idx].bodies[0] := -1;
mCells[idx].next := idx+1;
end;
mCells[High(mCells)].next := -1; // last cell
end;
-destructor TBodyGrid.Destroy ();
+destructor TBodyGridBase.Destroy ();
begin
mCells := nil;
mGrid := nil;
end;
-procedure TBodyGrid.dumpStats ();
+// ////////////////////////////////////////////////////////////////////////// //
+procedure TBodyGridBase.dumpStats ();
var
idx, mcb, cidx, cnt: Integer;
begin
end;
-function TBodyGrid.allocCell: Integer;
+// ////////////////////////////////////////////////////////////////////////// //
+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.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 TBodyGridBase.allocCell (): Integer;
var
idx: Integer;
begin
SetLength(mCells, mFreeCell+32768); // arbitrary number
for idx := mFreeCell to High(mCells) do
begin
- mCells[idx].body := -1;
+ mCells[idx].bodies[0] := -1;
mCells[idx].next := idx+1;
end;
mCells[High(mCells)].next := -1; // last cell
result := mFreeCell;
mFreeCell := mCells[result].next;
mCells[result].next := -1;
+ mCells[result].bodies[0] := -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 = -1 then exit; // the thing that should not be
- mCells[idx].body := -1;
+ //if mCells[idx].body = -1 then exit; // the thing that should not be
+ mCells[idx].bodies[0] := -1;
mCells[idx].next := mFreeCell;
mFreeCell := idx;
Dec(mUsedCells);
end;
-function TBodyGrid.allocProxy (aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer): TBodyProxy;
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.allocProxy (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer): TBodyProxyId;
var
olen, idx: Integer;
px: PBodyProxyRec;
if (mProxyMaxCount < mProxyCount) then mProxyMaxCount := mProxyCount;
end;
-procedure TBodyGrid.freeProxy (body: TBodyProxy);
+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?)');
end;
-function TBodyGrid.forGridRect (x, y, w, h: Integer; cb: GridInternalCB): Boolean;
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.forGridRect (x, y, w, h: Integer; cb: TGridInternalCB; bodyId: TBodyProxyId): Boolean;
+const
+ tsize = mTileSize;
var
gx, gy: Integer;
+ gw, gh: Integer;
begin
result := false;
if (w < 1) or (h < 1) or not assigned(cb) then exit;
Dec(y, mMinY);
// go on
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
+ 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 >= mHeight) then break;
- for gx := x div mTileSize to (x+w-1) div mTileSize do
+ if (gy >= gh) then break;
+ for gx := x div tsize to (x+w-1) div tsize do
begin
if (gx < 0) then continue;
- if (gx >= mWidth) then break;
- if (cb(gy*mWidth+gx)) then begin result := true; exit; end;
+ if (gx >= gw) then break;
+ result := cb(gy*gw+gx, bodyId);
+ if result then exit;
end;
end;
end;
-procedure TBodyGrid.insert (body: TBodyProxy);
-
- function inserter (grida: Integer): Boolean;
- var
- cidx: Integer;
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.inserter (grida: Integer; bodyId: TBodyProxyId): Boolean;
+var
+ 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
- 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;
+ pi := @mCells[pc];
+ f := 0;
+ for f := 0 to High(TGridCell.bodies) do
+ begin
+ if (pi.bodies[f] = -1) then
+ begin
+ // can add here
+ pi.bodies[f] := bodyId;
+ if (f+1 < Length(TGridCell.bodies)) then pi.bodies[f+1] := -1;
+ exit;
+ end;
+ end;
end;
+ // either no room, or no cell at all
+ cidx := allocCell();
+ mCells[cidx].bodies[0] := bodyId;
+ mCells[cidx].bodies[1] := -1;
+ mCells[cidx].next := pc;
+ mGrid[grida] := cidx;
+end;
+procedure TBodyGridBase.insertInternal (body: TBodyProxyId);
var
px: PBodyProxyRec;
begin
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);
+ forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, inserter, body);
end;
// absolutely not tested
-procedure TBodyGrid.remove (body: TBodyProxy);
-
- function remover (grida: Integer): Boolean;
- var
- pidx, idx, tmp: Integer;
+function TBodyGridBase.remover (grida: Integer; bodyId: TBodyProxyId): Boolean;
+var
+ f: Integer;
+ pidx, idx, tmp: Integer;
+ pc: PGridCell;
+begin
+ result := false; // never stop
+ // find and remove cell
+ pidx := -1;
+ idx := mGrid[grida];
+ while (idx >= 0) do
begin
- result := false; // never stop
- // find and remove cell
- pidx := -1;
- idx := mGrid[grida];
- while idx >= 0 do
+ tmp := mCells[idx].next;
+ pc := @mCells[idx];
+ f := 0;
+ while (f < High(TGridCell.bodies)) do
begin
- tmp := mCells[idx].next;
- if (mCells[idx].body = body) then
+ if (pc.bodies[f] = bodyId) then
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
- begin
- pidx := idx;
+ // i found her!
+ if (f = 0) and (pc.bodies[1] = -1) then
+ begin
+ // this cell contains no elements, remove it
+ tmp := mCells[idx].next;
+ if (pidx = -1) then mGrid[grida] := tmp else mCells[pidx].next := tmp;
+ freeCell(idx);
+ end
+ else
+ begin
+ // remove element from bucket
+ Inc(f);
+ while (f < High(TGridCell.bodies)) do
+ begin
+ pc.bodies[f-1] := pc.bodies[f];
+ if (pc.bodies[f] = -1) then break;
+ Inc(f);
+ end;
+ pc.bodies[High(TGridCell.bodies)] := -1; // just in case
+ end;
+ exit; // assume that we cannot have one object added to bucket twice
end;
- idx := tmp;
+ Inc(f);
end;
+ pidx := idx;
+ idx := tmp;
end;
+end;
+// absolutely not tested
+procedure TBodyGridBase.removeInternal (body: TBodyProxyId);
var
px: PBodyProxyRec;
begin
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);
+ forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover, body);
end;
-function TBodyGrid.insertBody (aObj: TObject; aX, aY, aWidth, aHeight: Integer; aTag: Integer=0): TBodyProxy;
+// ////////////////////////////////////////////////////////////////////////// //
+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);
- insert(result);
+ insertInternal(result);
end;
-procedure TBodyGrid.removeBody (aObj: TBodyProxy);
+procedure TBodyGridBase.removeBody (body: TBodyProxyId);
begin
- if (aObj < 0) or (aObj > High(mProxies)) then exit; // just in case
- removeBody(aObj);
- freeProxy(aObj);
+ if (body < 0) or (body > High(mProxies)) then exit; // just in case
+ removeInternal(body);
+ freeProxy(body);
end;
-procedure TBodyGrid.moveResizeBody (body: TBodyProxy; dx, dy, sx, sy: Integer);
+// ////////////////////////////////////////////////////////////////////////// //
+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
- if ((dx = 0) and (dy = 0) and (sx = 0) and (sy = 0)) then exit;
- remove(body);
px := @mProxies[body];
- Inc(px.mX, dx);
- Inc(px.mY, dy);
- Inc(px.mWidth, sx);
- Inc(px.mHeight, sy);
- insert(body);
+ x0 := px.mX;
+ y0 := px.mY;
+ w := px.mWidth;
+ h := px.mHeight;
+ if (nx = x0) and (ny = y0) and (nw = w) and (nh = h) then exit;
+ // 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
+ removeInternal(body);
+ px.mX := nx;
+ px.mY := ny;
+ px.mWidth := nw;
+ px.mHeight := nh;
+ insertInternal(body);
+ end
+ else
+ begin
+ px.mX := nx;
+ px.mY := ny;
+ px.mWidth := nw;
+ px.mHeight := nh;
+ end;
end;
-procedure TBodyGrid.moveBody (body: TBodyProxy; dx, dy: Integer);
+procedure TBodyGridBase.moveBody (body: TBodyProxyId; nx, ny: Integer);
+var
+ px: PBodyProxyRec;
+ x0, y0: Integer;
begin
- moveResizeBody(body, dx, dy, 0, 0);
+ 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;
+ if (nx div mTileSize <> x0 div mTileSize) or (ny div mTileSize <> y0 div mTileSize) then
+ begin
+ // crossed tile boundary, do heavy work
+ removeInternal(body);
+ px.mX := nx;
+ px.mY := ny;
+ insertInternal(body);
+ end
+ else
+ begin
+ // nothing to do with the grid, just fix coordinates
+ px.mX := nx;
+ px.mY := ny;
+ end;
end;
-procedure TBodyGrid.resizeBody (body: TBodyProxy; sx, sy: Integer);
+procedure TBodyGridBase.resizeBody (body: TBodyProxyId; nw, nh: Integer);
+var
+ px: PBodyProxyRec;
+ x0, y0, w, h: Integer;
begin
- moveResizeBody(body, 0, 0, sx, sy);
+ 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;
+ w := px.mWidth;
+ h := px.mHeight;
+ if ((x0+w) div mTileSize <> (x0+nw) div mTileSize) or
+ ((y0+h) div mTileSize <> (y0+nh) div mTileSize) then
+ begin
+ // 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;
end;
-function TBodyGrid.forEachInAABB (x, y, w, h: Integer; cb: GridQueryCB): Boolean;
- function iterator (grida: Integer): Boolean;
- var
- idx: Integer;
- px: PBodyProxyRec;
+// ////////////////////////////////////////////////////////////////////////// //
+// no callback: return `true` on the first hit
+function TBodyGridBase.forEachAtPoint (x, y: Integer; cb: TGridQueryCB; tagmask: Integer=-1): ITP;
+var
+ f: Integer;
+ idx, curci: Integer;
+ cc: PGridCell = nil;
+ px: PBodyProxyRec;
+ lq: LongWord;
+ ptag: Integer;
+begin
+ result := Default(ITP);
+ tagmask := tagmask and TagFullMask;
+ if (tagmask = 0) then exit;
+
+ // 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)];
+ // restore coords
+ Inc(x, mMinX);
+ Inc(y, mMinY);
+
+ // increase query counter
+ Inc(mLastQuery);
+ if (mLastQuery = 0) then
begin
- result := false;
- idx := mGrid[grida];
- while (idx >= 0) do
+ // just in case of overflow
+ mLastQuery := 1;
+ for idx := 0 to High(mProxies) do mProxies[idx].mQueryMark := 0;
+ end;
+ lq := mLastQuery;
+
+ while (curci <> -1) do
+ begin
+ cc := @mCells[curci];
+ for f := 0 to High(TGridCell.bodies) do
begin
- if (mCells[idx].body <> -1) then
+ 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 := @mProxies[mCells[idx].body];
- if (px.mQueryMark <> mLastQuery) then
+ if (x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight) 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);
- px.mQueryMark := mLastQuery;
- if (cb(px.mObj, px.mTag)) then begin result := true; exit; end;
+ px.mQueryMark := lq;
+ 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;
end;
- idx := mCells[idx].next;
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 := false;
- if not assigned(cb) then exit;
+ 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);
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 High(TGridCell.bodies) do
+ begin
+ if (cc.bodies[f] = -1) then break;
+ px := @mProxies[cc.bodies[f]];
+ ptag := px.mTag;
+ if (not allowDisabled) and ((ptag and TagDisabled) <> 0) then continue;
+ if ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) then
+ //if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) then
+ //if ( ((ptag and TagDisabled) = 0) = ignoreDisabled) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) then
+ begin
+ 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;
+ px.mQueryMark := lq;
+ 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;
+ end;
+ curci := cc.next;
+ end;
+ end;
+ end;
+end;
+
- result := forGridRect(x, y, w, h, iterator);
+// ////////////////////////////////////////////////////////////////////////// //
+// no callback: return `true` on the nearest hit
+function TBodyGridBase.traceRay (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;
-function TBodyGrid.getProxyForBody (aObj: TObject; x, y, w, h: Integer): TBodyProxy;
+// no callback: return `true` on the nearest hit
+// you are not supposed to understand this
+function TBodyGridBase.traceRay (out ex, ey: Integer; ax0, ay0, ax1, ay1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP;
+const
+ tsize = mTileSize;
var
- res: TBodyProxy = -1;
+ 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 exit; // as the first point is ignored, just get outta here
+
+ 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;
- function iterator (grida: Integer): Boolean;
- var
- idx: Integer;
+ // vertical setup
+ if (y0 < y1) then
begin
- result := false;
- idx := mGrid[grida];
- while idx >= 0 do
+ // 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
+ if (xd = term) then exit;
+ 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^ > mHeight*tsize) then raise Exception.Create('raycaster internal error (0)');
+ {$ENDIF}
+
+ //if (dbgShowTraceLog) then e_WriteLog(Format('raycast start: (%d,%d)-(%d,%d); xptr^=%d; yptr^=%d', [ax0, ay0, ax1, ay1, xptr^, yptr^]), MSG_NOTIFY);
+
+ // restore query coords
+ Inc(ax0, minx);
+ Inc(ay0, miny);
+ //Inc(ax1, minx);
+ //Inc(ay1, miny);
+
+ // increase query counter
+ Inc(mLastQuery);
+ if (mLastQuery = 0) then
+ begin
+ // just in case of overflow
+ mLastQuery := 1;
+ for f := 0 to High(mProxies) do mProxies[f].mQueryMark := 0;
+ end;
+ lq := mLastQuery;
+
+ ccidx := -1;
+ // draw it; can omit checks
+ while (xd <> term) do
+ begin
+ // check cell(s)
+ {$IF DEFINED(D2F_DEBUG)}
+ if (xptr^ < 0) or (yptr^ < 0) or (xptr^ >= gw*tsize) and (yptr^ > mHeight*tsize) then raise Exception.Create('raycaster internal error (0)');
+ {$ENDIF}
+ // new tile?
+ ga := (yptr^ div tsize)*gw+(xptr^ div tsize);
+ if (ga <> lastGA) then
begin
- if (mCells[idx].body <> -1) and (mProxies[mCells[idx].body].mObj = aObj) then
+ // yes
+ if (ccidx <> -1) then
begin
- result := true;
- res := mCells[idx].body;
- exit;
+ // 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;
- idx := mCells[idx].next;
+ 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 High(TGridCell.bodies) 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;
+ end
+ else
+ begin
+ // remember this hitpoint if it is nearer than an old one
+ distSq := distanceSq(ax0, ay0, prevx, prevy);
+ 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;
+end;
+
+// ////////////////////////////////////////////////////////////////////////// //
+//FIXME! optimize this with real tile walking
+function TBodyGridBase.forEachAlongLine (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
- result := -1;
- if (aObj = nil) then exit;
- forGridRect(x, y, w, h, iterator);
- result := res;
+ 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 High(TGridCell.bodies) 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;