diff --git a/src/game/g_grid.pas b/src/game/g_grid.pas
index 9f14d3d5f69481dc9f6a6763cbb356c9e3b2f4f9..b4dca5eecf483d5255bbee3591398cd584e9fa7c 100644 (file)
--- a/src/game/g_grid.pas
+++ b/src/game/g_grid.pas
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*)
-{$MODE DELPHI}
-{$modeswitch nestedprocvars}
+// universal spatial grid
+{$INCLUDE ../shared/a_modes.inc}
unit g_grid;
interface
-uses e_log;
-
-const
- GridDefaultTileSize = 32;
type
- GridQueryCB = function (obj: TObject; tag: Integer): Boolean is nested; // return `true` to stop
+ TBodyProxyId = Integer;
-type
- TBodyGrid = class;
+ generic TBodyGridBase<ITP> = class(TObject)
+ public
+ type TGridQueryCB = function (obj: ITP; tag: Integer): Boolean is nested; // return `true` to stop
+ type TGridRayQueryCB = function (obj: ITP; tag: Integer; x, y, prevx, prevy: Integer): Boolean is nested; // return `true` to stop
+
+ const TagDisabled = $40000000;
+ const TagFullMask = $3fffffff;
- TBodyProxy = class(TObject)
private
- mX, mY, mWidth, mHeight: Integer; // aabb
- mQueryMark: DWord; // was this object visited at this query?
- mObj: TObject;
- mGrid: TBodyGrid;
- mTag: Integer;
+ const
+ GridDefaultTileSize = 32;
+ GridCellBucketSize = 8; // WARNING! can't be less than 2!
- public
- constructor Create (aGrid: TBodyGrid; aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
- destructor Destroy (); override;
+ private
+ type
+ PBodyProxyRec = ^TBodyProxyRec;
+ TBodyProxyRec = record
+ private
+ mX, mY, mWidth, mHeight: Integer; // aabb
+ mQueryMark: LongWord; // was this object visited at this query?
+ mObj: ITP;
+ mTag: Integer; // `TagDisabled` set: disabled ;-)
+ nextLink: TBodyProxyId; // next free or nothing
+
+ private
+ procedure setup (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer);
+ 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;
+ 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;
+ TGridInternalCB = function (grida: Integer; bodyId: TBodyProxyId): Boolean of object; // return `true` to stop
- TBodyGrid = class(TObject)
private
mTileSize: Integer;
+ mMinX, mMinY: Integer; // so grids can start at any origin
mWidth, mHeight: Integer; // in tiles
mGrid: array of Integer; // mWidth*mHeight, index in mCells
mCells: array of TGridCell; // cell pool
mFreeCell: Integer; // first free cell index or -1
- mLastQuery: Integer;
+ mLastQuery: LongWord;
mUsedCells: Integer;
+ mProxies: array of TBodyProxyRec;
+ mProxyFree: TBodyProxyId; // free
+ mProxyCount: Integer; // currently used
+ mProxyMaxCount: Integer;
private
function allocCell: Integer;
procedure freeCell (idx: Integer); // `next` is simply overwritten
- procedure insert (body: TBodyProxy);
- procedure remove (body: TBodyProxy);
+ function allocProxy (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer): TBodyProxyId;
+ procedure freeProxy (body: TBodyProxyId);
+
+ procedure insertInternal (body: TBodyProxyId);
+ procedure removeInternal (body: TBodyProxyId);
+
+ function forGridRect (x, y, w, h: Integer; cb: TGridInternalCB; bodyId: TBodyProxyId): Boolean;
+
+ function inserter (grida: Integer; bodyId: TBodyProxyId): Boolean;
+ function remover (grida: Integer; bodyId: TBodyProxyId): Boolean;
+
+ function getProxyEnabled (pid: TBodyProxyId): Boolean; inline;
+ procedure setProxyEnabled (pid: TBodyProxyId; val: Boolean); inline;
public
- constructor Create (aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
+ constructor Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
destructor Destroy (); override;
- function insertBody (aObj: TObject; ax, ay, aWidth, aHeight: Integer; aTag: Integer=0): TBodyProxy;
- procedure moveBody (body: TBodyProxy; dx, dy: Integer);
- procedure resizeBody (body: TBodyProxy; sx, sy: Integer);
- procedure moveResizeBody (body: TBodyProxy; dx, dy, sx, sy: Integer);
+ function insertBody (aObj: ITP; ax, ay, aWidth, aHeight: Integer; aTag: Integer=-1): TBodyProxyId;
+ procedure removeBody (aObj: TBodyProxyId); // WARNING! this WILL destroy proxy!
+
+ procedure moveBody (body: TBodyProxyId; dx, dy: Integer);
+ procedure resizeBody (body: TBodyProxyId; sx, sy: Integer);
+ procedure moveResizeBody (body: TBodyProxyId; dx, dy, sx, sy: Integer);
+
+ function insideGrid (x, y: 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;
- function forEachInAABB (x, y, w, h: Integer; cb: GridQueryCB): Boolean;
+ //WARNING: don't modify grid while any query is in progress (no checks are made!)
+ // you can set enabled/disabled flag, tho (but iterator can still return objects disabled inside it)
+ // no callback: return `true` on the first hit
+ function forEachAtPoint (x, y: Integer; cb: TGridQueryCB; tagmask: Integer=-1): ITP;
- function getProxyForBody (aObj: TObject; x, y, w, h: Integer): TBodyProxy;
+ //WARNING: don't modify grid while any query is in progress (no checks are made!)
+ // you can set enabled/disabled flag, tho (but iterator can still return objects disabled inside it)
+ // 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; x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP;
procedure dumpStats ();
+
+ //WARNING! no sanity checks!
+ property proxyEnabled[pid: TBodyProxyId]: Boolean read getProxyEnabled write setProxyEnabled;
end;
implementation
uses
- SysUtils;
+ SysUtils, e_log;
// ////////////////////////////////////////////////////////////////////////// //
-constructor TBodyProxy.Create (aGrid: TBodyGrid; aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
+procedure TBodyGridBase.TBodyProxyRec.setup (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer);
begin
mX := aX;
mY := aY;
mHeight := aHeight;
mQueryMark := 0;
mObj := aObj;
- mGrid := aGrid;
mTag := aTag;
-end;
-
-destructor TBodyProxy.Destroy ();
-begin
+ nextLink := -1;
end;
// ////////////////////////////////////////////////////////////////////////// //
-constructor TBodyGrid.Create (aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
+constructor TBodyGridBase.Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
var
idx: Integer;
begin
if aPixWidth < aTileSize then aPixWidth := aTileSize;
if aPixHeight < aTileSize then aPixHeight := aTileSize;
mTileSize := aTileSize;
+ mMinX := aMinPixX;
+ mMinY := aMinPixY;
mWidth := (aPixWidth+aTileSize-1) div aTileSize;
mHeight := (aPixHeight+aTileSize-1) div aTileSize;
SetLength(mGrid, mWidth*mHeight);
SetLength(mCells, mWidth*mHeight);
+ SetLength(mProxies, 8192);
mFreeCell := 0;
// init free list
for idx := 0 to High(mCells) do
begin
- mCells[idx].body := nil;
+ mCells[idx].bodies[0] := -1;
mCells[idx].next := idx+1;
end;
mCells[High(mCells)].next := -1; // last cell
// init grid
for idx := 0 to High(mGrid) do mGrid[idx] := -1;
+ // init proxies
+ for idx := 0 to High(mProxies) do mProxies[idx].nextLink := idx+1;
+ mProxies[High(mProxies)].nextLink := -1;
mLastQuery := 0;
mUsedCells := 0;
+ mProxyFree := 0;
+ mProxyCount := 0;
+ mProxyMaxCount := 0;
e_WriteLog(Format('created grid with size: %dx%d (tile size: %d); pix: %dx%d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize]), MSG_NOTIFY);
end;
-destructor TBodyGrid.Destroy ();
-var
- idx: Integer;
+destructor TBodyGridBase.Destroy ();
begin
- // free all owned proxies
- for idx := 0 to High(mCells) do mCells[idx].body.Free;
mCells := nil;
mGrid := nil;
+ mProxies := nil;
+ inherited;
end;
-procedure TBodyGrid.dumpStats ();
+procedure TBodyGridBase.dumpStats ();
var
idx, mcb, cidx, cnt: Integer;
begin
end;
if (mcb < cnt) then mcb := cnt;
end;
- e_WriteLog(Format('grid size: %dx%d (tile size: %d); pix: %dx%d; used cells: %d; max bodys in cell: %d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize, mUsedCells, mcb]), MSG_NOTIFY);
+ e_WriteLog(Format('grid size: %dx%d (tile size: %d); pix: %dx%d; used cells: %d; max bodies in cell: %d; max proxies allocated: %d; proxies used: %d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize, mUsedCells, mcb, mProxyMaxCount, mProxyCount]), MSG_NOTIFY);
end;
-function TBodyGrid.allocCell: Integer;
+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.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
begin
// no free cells, want more
mFreeCell := Length(mCells);
- SetLength(mCells, mFreeCell+16384); // arbitrary number
+ SetLength(mCells, mFreeCell+32768); // arbitrary number
for idx := mFreeCell to High(mCells) do
begin
- mCells[idx].body := nil;
+ mCells[idx].bodies[0] := -1;
mCells[idx].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 = nil then exit; // the thing that should not be
- mCells[idx].body := nil;
+ //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;
-procedure TBodyGrid.insert (body: TBodyProxy);
+function TBodyGridBase.allocProxy (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer): TBodyProxyId;
+var
+ olen, idx: Integer;
+ px: PBodyProxyRec;
+begin
+ if (mProxyFree = -1) then
+ begin
+ // no free proxies, resize list
+ olen := Length(mProxies);
+ SetLength(mProxies, olen+8192); // arbitrary number
+ for idx := olen to High(mProxies) do mProxies[idx].nextLink := idx+1;
+ mProxies[High(mProxies)].nextLink := -1;
+ mProxyFree := olen;
+ end;
+ // get one from list
+ result := mProxyFree;
+ px := @mProxies[result];
+ mProxyFree := px.nextLink;
+ px.setup(aX, aY, aWidth, aHeight, aObj, aTag);
+ // add to used list
+ px.nextLink := -1;
+ // statistics
+ Inc(mProxyCount);
+ if (mProxyMaxCount < mProxyCount) then mProxyMaxCount := mProxyCount;
+end;
+
+procedure TBodyGridBase.freeProxy (body: TBodyProxyId);
+begin
+ if (body < 0) or (body > High(mProxies)) then exit; // just in case
+ if (mProxyCount = 0) then raise Exception.Create('wutafuuuuu in grid (no allocated proxies, what i should free now?)');
+ // add to free list
+ mProxies[body].mObj := nil;
+ mProxies[body].nextLink := mProxyFree;
+ mProxyFree := body;
+ Dec(mProxyCount);
+end;
+
+
+function TBodyGridBase.forGridRect (x, y, w, h: Integer; cb: TGridInternalCB; bodyId: TBodyProxyId): Boolean;
+var
+ gx, gy: Integer;
+ gw, gh, tsize: Integer;
+begin
+ result := false;
+ if (w < 1) or (h < 1) or not assigned(cb) then exit;
+ // fix coords
+ Dec(x, mMinX);
+ Dec(y, mMinY);
+ // go on
+ if (x+w <= 0) or (y+h <= 0) then exit;
+ gw := mWidth;
+ gh := mHeight;
+ tsize := mTileSize;
+ if (x >= gw*tsize) or (y >= gh*tsize) then exit;
+ for gy := y div tsize to (y+h-1) div tsize do
+ begin
+ if (gy < 0) then continue;
+ if (gy >= gh) then break;
+ for gx := x div tsize to (x+w-1) div tsize do
+ begin
+ if (gx < 0) then continue;
+ if (gx >= gw) then break;
+ result := cb(gy*gw+gx, bodyId);
+ if result then exit;
+ end;
+ end;
+end;
+
+
+function TBodyGridBase.inserter (grida: Integer; bodyId: TBodyProxyId): Boolean;
var
- dx, dy, gx, gy, cidx: Integer;
+ cidx: Integer;
+ pc: Integer;
+ pi: PGridCell;
+ f: Integer;
begin
- if body = nil then exit;
- if (body.mWidth < 1) or (body.mHeight < 1) then exit;
- // out of grid?
- if (body.mX+body.mWidth <= 0) or (body.mY+body.mHeight <= 0) then exit;
- if (body.mX >= mWidth*mTileSize) or (body.mY >= mHeight*mTileSize) then exit;
- //e_WriteLog(Format('grid: inserting body: (%d,%d)-(%dx%d)', [body.mX, body.mY, body.mWidth, body.mHeight]), MSG_NOTIFY);
- gy := body.mY div mTileSize;
- dy := 0;
- while (dy < body.mHeight) do
+ result := false; // never stop
+ // add body to the given grid cell
+ pc := mGrid[grida];
+ if (pc <> -1) then
begin
- if (gy >= 0) and (gy < mHeight) then
+ pi := @mCells[pc];
+ f := 0;
+ for f := 0 to High(TGridCell.bodies) do
begin
- dx := 0;
- gx := body.mX div mTileSize;
- while (dx < body.mWidth) do
+ if (pi.bodies[f] = -1) then
begin
- if (gx >= 0) and (gx < mWidth) then
- begin
- //e_WriteLog(Format(' 00: allocating cell for grid coords (%d,%d), body coords:(%d,%d)', [gx, gy, dx, dy]), MSG_NOTIFY);
- cidx := allocCell();
- //e_WriteLog(Format(' 01: allocated cell for grid coords (%d,%d), body coords:(%d,%d): #%d', [gx, gy, dx, dy, cidx]), MSG_NOTIFY);
- mCells[cidx].body := body;
- mCells[cidx].next := mGrid[gy*mWidth+gx];
- mGrid[gy*mWidth+gx] := cidx;
- //e_WriteLog(Format(' 02: put cell for grid coords (%d,%d), body coords:(%d,%d): #%d', [gx, gy, dx, dy, cidx]), MSG_NOTIFY);
- end;
- Inc(dx, mTileSize);
- Inc(gx);
+ // can add here
+ pi.bodies[f] := bodyId;
+ if (f+1 < Length(TGridCell.bodies)) then pi.bodies[f+1] := -1;
+ exit;
end;
end;
- Inc(dy, mTileSize);
- Inc(gy);
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, body);
end;
// absolutely not tested
-procedure TBodyGrid.remove (body: TBodyProxy);
+function TBodyGridBase.remover (grida: Integer; bodyId: TBodyProxyId): Boolean;
var
- dx, dy, gx, gy, idx, pidx, tmp: Integer;
+ f: Integer;
+ pidx, idx, tmp: Integer;
+ pc: PGridCell;
begin
- if body = nil then exit;
- if (body.mWidth < 1) or (body.mHeight < 1) then exit;
- // out of grid?
- if (body.mX+body.mWidth <= 0) or (body.mY+body.mHeight <= 0) then exit;
- if (body.mX >= mWidth*mTileSize) or (body.mY >= mHeight*mTileSize) then exit;
- gy := body.mY div mTileSize;
- dy := 0;
+ result := false; // never stop
+ // find and remove cell
pidx := -1;
- while (dy < body.mHeight) do
+ idx := mGrid[grida];
+ while (idx >= 0) do
begin
- if (gy >= 0) and (gy < mHeight) then
+ tmp := mCells[idx].next;
+ pc := @mCells[idx];
+ f := 0;
+ while (f < High(TGridCell.bodies)) do
begin
- dx := 0;
- gx := body.mX div mTileSize;
- while (dx < body.mWidth) do
+ if (pc.bodies[f] = bodyId) then
begin
- if (gx >= 0) and (gx < mWidth) then
+ // i found her!
+ if (f = 0) and (pc.bodies[1] = -1) then
begin
- // find and remove cell
- pidx := -1;
- idx := mGrid[gy*mWidth+gx];
- while idx >= 0 do
+ // 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
- tmp := mCells[idx].next;
- if mCells[idx].body = body then
- begin
- if pidx = -1 then mGrid[gy*mWidth+gx] := tmp else mCells[pidx].next := tmp;
- freeCell(idx);
- end
- else
- begin
- pidx := idx;
- end;
- idx := tmp;
+ 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;
- Inc(dx, mTileSize);
- Inc(gx);
+ exit; // assume that we cannot have one object added to bucket twice
end;
+ Inc(f);
end;
- Inc(dy, mTileSize);
- Inc(gy);
+ 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, body);
+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);
+end;
+
-function TBodyGrid.insertBody (aObj: TObject; aX, aY, aWidth, aHeight: Integer; aTag: Integer=0): TBodyProxy;
+procedure TBodyGridBase.removeBody (aObj: TBodyProxyId);
begin
- result := nil;
- if aObj = nil then exit;
- result := TBodyProxy.Create(self, aX, aY, aWidth, aHeight, aObj, aTag);
- insert(result);
+ if (aObj < 0) or (aObj > High(mProxies)) then exit; // just in case
+ removeInternal(aObj);
+ freeProxy(aObj);
end;
-procedure TBodyGrid.moveResizeBody (body: TBodyProxy; dx, dy, sx, sy: Integer);
+procedure TBodyGridBase.moveResizeBody (body: TBodyProxyId; dx, dy, sx, sy: Integer);
+var
+ px: PBodyProxyRec;
begin
- if (body = nil) or ((dx = 0) and (dy = 0) and (sx = 0) and (sy = 0)) then exit;
- remove(body);
- Inc(body.mX, dx);
- Inc(body.mY, dy);
- Inc(body.mWidth, sx);
- Inc(body.mHeight, sy);
- insert(body);
+ if (body < 0) or (body > High(mProxies)) then exit; // just in case
+ if ((dx = 0) and (dy = 0) and (sx = 0) and (sy = 0)) then exit;
+ removeInternal(body);
+ px := @mProxies[body];
+ Inc(px.mX, dx);
+ Inc(px.mY, dy);
+ Inc(px.mWidth, sx);
+ Inc(px.mHeight, sy);
+ insertInternal(body);
end;
-procedure TBodyGrid.moveBody (body: TBodyProxy; dx, dy: Integer);
+procedure TBodyGridBase.moveBody (body: TBodyProxyId; dx, dy: Integer);
begin
moveResizeBody(body, dx, dy, 0, 0);
end;
-procedure TBodyGrid.resizeBody (body: TBodyProxy; sx, sy: Integer);
+procedure TBodyGridBase.resizeBody (body: TBodyProxyId; sx, sy: Integer);
begin
moveResizeBody(body, 0, 0, sx, sy);
end;
-function TBodyGrid.forEachInAABB (x, y, w, h: Integer; cb: GridQueryCB): Boolean;
+// ////////////////////////////////////////////////////////////////////////// //
+// no callback: return `true` on the first hit
+function TBodyGridBase.forEachAtPoint (x, y: Integer; cb: TGridQueryCB; tagmask: Integer=-1): ITP;
var
- gx, gy, idx: Integer;
- minx, miny, maxx, maxy: Integer;
+ f: Integer;
+ idx, curci: Integer;
+ cc: PGridCell = nil;
+ px: PBodyProxyRec;
+ lq: LongWord;
+ ptag: Integer;
begin
- result := false;
- if not assigned(cb) then exit;
+ 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
+ // 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 (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
+ 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;
+ 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;
+ 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;
+ curci: Integer;
+ f: Integer;
+ cc: PGridCell = nil;
+ px: PBodyProxyRec;
+ lq: LongWord;
+ tsize, gw: Integer;
+ x0, y0: Integer;
+ ptag: Integer;
+begin
+ result := Default(ITP);
if (w < 1) or (h < 1) then exit;
- minx := x;
- miny := y;
- maxx := x+w-1;
- maxy := y+h-1;
- if (minx > maxx) or (miny > maxy) then exit;
- if (maxx < 0) or (maxy < 0) then exit;
- if (minx >= mWidth*mTileSize) or (miny >= mHeight*mTileSize) then exit;
+ tagmask := tagmask and TagFullMask;
+ if (tagmask = 0) then exit;
+
+ x0 := x;
+ y0 := y;
+
+ // fix coords
+ Dec(x, mMinX);
+ Dec(y, mMinY);
+
+ gw := mWidth;
+ tsize := mTileSize;
+
+ if (x+w <= 0) or (y+h <= 0) then exit;
+ if (x >= gw*tsize) or (y >= mHeight*tsize) then exit;
+
// increase query counter
Inc(mLastQuery);
if (mLastQuery = 0) then
begin
// just in case of overflow
mLastQuery := 1;
- for idx := 0 to High(mCells) do if (mCells[idx].body <> nil) then mCells[idx].body.mQueryMark := 0;
+ 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);
- // process grid
- for gy := miny div mTileSize to maxy div mTileSize do
+ 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 := minx div mTileSize to maxx div mTileSize do
+ for gx := x div tsize to (x+w-1) div tsize do
begin
if (gx < 0) then continue;
- if (gx >= mWidth) then break;
- idx := mGrid[gy*mWidth+gx];
- while idx >= 0 do
+ if (gx >= gw) then break;
+ // process cells
+ curci := mGrid[gy*gw+gx];
+ while (curci <> -1) do
begin
- if (mCells[idx].body <> nil) and (mCells[idx].body.mQueryMark <> mLastQuery) then
+ cc := @mCells[curci];
+ for f := 0 to High(TGridCell.bodies) do
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;
+ 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;
- idx := mCells[idx].next;
+ curci := cc.next;
end;
end;
end;
end;
-function TBodyGrid.getProxyForBody (aObj: TObject; x, y, w, h: Integer): TBodyProxy;
+// ////////////////////////////////////////////////////////////////////////// //
+// 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;
+
+
+// no callback: return `true` on the nearest hit
+function TBodyGridBase.traceRay (out ex, ey: Integer; x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP;
+var
+ i: Integer;
+ dx, dy, d: Integer;
+ xerr, yerr: Integer;
+ incx, incy: Integer;
+ stepx, stepy: Integer;
+ x, y: Integer;
+ maxx, maxy: Integer;
+ tsize: Integer; // tile size
+ gw, gh: Integer;
+ ccidx: Integer;
+ curci: Integer;
+ cc: PGridCell;
+ hasUntried: Boolean;
+ px: PBodyProxyRec;
+ lq: LongWord;
+ prevX, prevY: Integer;
+ minx, miny: Integer;
+ ptag: Integer;
+ lastDistSq, distSq: Integer;
+ wasHit: Boolean = false;
+ lastObj: ITP;
+ lastWasInGrid: Boolean;
+ tbcross: Boolean;
+ f: Integer;
+begin
+ result := Default(ITP);
+ lastObj := Default(ITP);
+ tagmask := tagmask and TagFullMask;
+ if (tagmask = 0) then begin ex := x0; ey := y0; exit; end;
+
+ minx := mMinX;
+ miny := mMinY;
+
+ dx := x1-x0;
+ dy := y1-y0;
- function qq (obj: TObject; tag: Integer): Boolean;
+ 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;
+
+ 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
- result := (obj = aObj);
+ // just in case of overflow
+ mLastQuery := 1;
+ for i := 0 to High(mProxies) do mProxies[i].mQueryMark := 0;
end;
+ lq := mLastQuery;
-begin
- result := nil;
- forEachInAABB(x, y, w, h, qq);
+ // cache various things
+ tsize := mTileSize;
+ gw := mWidth;
+ gh := mHeight;
+ maxx := gw*tsize-1;
+ maxy := gh*tsize-1;
+
+ // setup distance and flags
+ lastDistSq := (x1-x0)*(x1-x0)+(y1-y0)*(y1-y0)+1;
+ 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;
+
+ // now trace
+ for i := 1 to d do
+ begin
+ // prevs are always in map coords
+ prevX := x+minx;
+ prevY := y+miny;
+ // do one step
+ xerr += dx;
+ yerr += dy;
+ // invariant: one of those always changed
+ if (xerr < 0) and (yerr < 0) then raise Exception.Create('internal bug in grid raycaster (0)');
+ 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 ((stepx or stepy) = 0) then raise Exception.Create('internal bug in grid raycaster (1)');
+ 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
+ // had something in the cell we're leaving?
+ if (ccidx <> -1) then
+ begin
+ // yes, signal cell completion
+ if assigned(cb) then
+ begin
+ if cb(nil, 0, x+minx, y+miny, prevX, prevY) then begin result := lastObj; exit; end;
+ end
+ else if wasHit then
+ begin
+ result := lastObj;
+ exit;
+ end;
+ end;
+ // setup new cell index
+ ccidx := mGrid[(y div tsize)*gw+(x div tsize)];
+ end;
+ end
+ else
+ begin
+ // out of grid, had something in the last processed cell?
+ if (ccidx <> -1) then
+ begin
+ // yes, signal cell completion
+ ccidx := -1;
+ if assigned(cb) then
+ begin
+ if cb(nil, 0, x+minx, y+miny, prevX, prevY) then begin result := lastObj; exit; end;
+ end
+ else if wasHit then
+ begin
+ result := lastObj;
+ exit;
+ end;
+ end;
+ 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;
+ 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)
+ 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
+ // 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 := (prevX-x0)*(prevX-x0)+(prevY-y0)*(prevY-y0);
+ 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;
+ // convert coords to grid
+ Dec(x, minx);
+ Dec(y, miny);
+ end;
+ end;
end;
+
end.