diff --git a/src/game/g_grid.pas b/src/game/g_grid.pas
index d1149adf46c64d47c5790f5731c2ea56e90ea278..d56a24365ec397c8c071b1bfa7f648709e8ae473 100644 (file)
--- a/src/game/g_grid.pas
+++ b/src/game/g_grid.pas
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
private
const
GridDefaultTileSize = 32;
+ {$IFDEF grid_use_buckets}
GridCellBucketSize = 8; // WARNING! can't be less than 2!
+ {$ENDIF}
private
type
TBodyProxyRec = record
private
mX, mY, mWidth, mHeight: Integer; // aabb
- mQueryMark: DWord; // was this object visited at this query?
+ mQueryMark: LongWord; // was this object visited at this query?
mObj: ITP;
mTag: Integer;
nextLink: TBodyProxyId; // next free or nothing
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: TBodyProxyId; // free
function inserter (grida: Integer): Boolean;
function remover (grida: Integer): Boolean;
- function iterator (grida: Integer): Boolean;
public
constructor Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
procedure resizeBody (body: TBodyProxyId; sx, sy: Integer);
procedure moveResizeBody (body: TBodyProxyId; dx, dy, sx, sy: Integer);
+ //WARNING: can't do recursive queries
function forEachInAABB (x, y, w, h: Integer; cb: TGridQueryCB; tagmask: Integer=-1): Boolean;
+ //WARNING: can't do recursive queries
+ function forEachAtPoint (x, y: Integer; cb: TGridQueryCB; tagmask: Integer=-1): Boolean;
+
+ //WARNING: can't do recursive queries
+ // cb with `(nil)` will be called before processing new tile
+ function traceRay (x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): Boolean; overload;
+
procedure dumpStats ();
end;
mProxyCount := 0;
mProxyMaxCount := 0;
mUData := 0;
- mTagMask := 0;
+ mTagMask := -1;
mItCB := nil;
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;
result := mFreeCell;
mFreeCell := mCells[result].next;
mCells[result].next := -1;
+ {$IFDEF grid_use_buckets}
+ mCells[result].bodies[0] := -1;
+ {$ELSE}
+ mCells[result].body := -1;
+ {$ENDIF}
Inc(mUsedCells);
//e_WriteLog(Format('grid: allocated new cell #%d (total: %d)', [result, mUsedCells]), MSG_NOTIFY);
end;
procedure TBodyGridBase.freeCell (idx: Integer);
begin
- if (idx >= 0) and (idx < High(mCells)) then
+ if (idx >= 0) and (idx < Length(mCells)) then
begin
//if mCells[idx].body = -1 then exit; // the thing that should not be
- //mCells[idx].body := -1;
+ {$IFDEF grid_use_buckets}
+ mCells[idx].bodies[0] := -1;
+ {$ELSE}
+ mCells[idx].body := -1;
+ {$ENDIF}
mCells[idx].next := mFreeCell;
mFreeCell := idx;
Dec(mUsedCells);
function TBodyGridBase.forGridRect (x, y, w, h: Integer; cb: TGridInternalCB): Boolean;
var
gx, gy: Integer;
+ gw, gh, tsize: 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);
+ if result then exit;
end;
end;
end;
function TBodyGridBase.inserter (grida: Integer): Boolean;
var
cidx: Integer;
- pc: PInteger;
+ pc: Integer;
{$IFDEF grid_use_buckets}
pi: PGridCell;
f: Integer;
begin
result := false; // never stop
// add body to the given grid cell
- pc := @mGrid[grida];
+ pc := mGrid[grida];
{$IFDEF grid_use_buckets}
- if (pc^ <> -1) then
+ if (pc <> -1) then
begin
- pi := @mCells[pc^];
+ pi := @mCells[pc];
f := 0;
for f := 0 to High(TGridCell.bodies) do
begin
cidx := allocCell();
mCells[cidx].bodies[0] := mUData;
mCells[cidx].bodies[1] := -1;
- mCells[cidx].next := pc^;
- pc^ := cidx;
+ mCells[cidx].next := pc;
+ mGrid[grida] := cidx;
{$ELSE}
cidx := allocCell();
//e_WriteLog(Format(' 01: allocated cell for grid coords (%d,%d), body coords:(%d,%d): #%d', [gx, gy, dx, dy, cidx]), MSG_NOTIFY);
mCells[cidx].body := mUData;
- mCells[cidx].next := pc^;
- pc^ := cidx;
+ mCells[cidx].next := pc;
+ mGrid[grida] := cidx;
{$ENDIF}
end;
procedure TBodyGridBase.insert (body: TBodyProxyId);
var
px: PBodyProxyRec;
- oudata: Integer;
begin
if (body < 0) or (body > High(mProxies)) then exit; // just in case
px := @mProxies[body];
- oudata := mUData;
mUData := body;
forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, inserter);
- mUData := oudata;
end;
function TBodyGridBase.remover (grida: Integer): Boolean;
var
- pidx, idx, tmp, f: Integer;
+ {$IFDEF grid_use_buckets}
+ f: Integer;
+ {$ENDIF}
+ pidx, idx, tmp: Integer;
+ {$IFDEF grid_use_buckets}
pc: PGridCell;
+ {$ENDIF}
begin
result := false; // never stop
// find and remove cell
procedure TBodyGridBase.remove (body: TBodyProxyId);
var
px: PBodyProxyRec;
- oudata: Integer;
begin
if (body < 0) or (body > High(mProxies)) then exit; // just in case
px := @mProxies[body];
- oudata := mUData;
mUData := body;
forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover);
- mUData := oudata;
end;
end;
-function TBodyGridBase.iterator (grida: Integer): Boolean;
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.forEachAtPoint (x, y: Integer; cb: TGridQueryCB; tagmask: Integer=-1): Boolean;
var
- idx: Integer;
- px: PBodyProxyRec;
{$IFDEF grid_use_buckets}
- pi: PGridCell;
f: Integer;
{$ENDIF}
+ idx, curci: Integer;
+ cc: PGridCell = nil;
+ px: PBodyProxyRec;
+ lq: LongWord;
begin
result := false;
- idx := mGrid[grida];
- while (idx >= 0) do
+ if not assigned(cb) or (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];
{$IFDEF grid_use_buckets}
- pi := @mCells[idx];
for f := 0 to High(TGridCell.bodies) do
begin
- if (pi.bodies[f] = -1) then break;
- px := @mProxies[pi.bodies[f]];
- if (px.mQueryMark <> mLastQuery) and ((px.mTag and mTagMask) <> 0) then
+ if (cc.bodies[f] = -1) then break;
+ px := @mProxies[cc.bodies[f]];
+ if (px.mQueryMark <> lq) and ((px.mTag and tagmask) <> 0) then
begin
- //e_WriteLog(Format(' query #%d body hit: (%d,%d)-(%dx%d) tag:%d', [mLastQuery, mCells[idx].body.mX, mCells[idx].body.mY, mCells[idx].body.mWidth, mCells[idx].body.mHeight, mCells[idx].body.mTag]), MSG_NOTIFY);
- px.mQueryMark := mLastQuery;
- if (mItCB(px.mObj, px.mTag)) then begin result := true; exit; end;
+ if (x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight) then
+ begin
+ px.mQueryMark := lq;
+ result := cb(px.mObj, px.mTag);
+ if result then exit;
+ end;
end;
end;
- idx := pi.next;
{$ELSE}
- if (mCells[idx].body <> -1) then
+ if (cc.body <> -1) then
begin
- px := @mProxies[mCells[idx].body];
- if (px.mQueryMark <> mLastQuery) and ((px.mTag and mTagMask) <> 0) then
+ px := @mProxies[cc.body];
+ if (px.mQueryMark <> lq) and ((px.mTag and tagmask) <> 0) 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 (mItCB(px.mObj, px.mTag)) then begin result := true; exit; end;
+ 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;
+ result := cb(px.mObj, px.mTag);
+ if result then exit;
+ end;
end;
end;
- idx := mCells[idx].next;
{$ENDIF}
+ curci := cc.next;
end;
end;
+
function TBodyGridBase.forEachInAABB (x, y, w, h: Integer; cb: TGridQueryCB; tagmask: Integer=-1): Boolean;
var
idx: Integer;
- otagmask: Integer;
- ocb: TGridQueryCB;
+ gx, gy: Integer;
+ curci: Integer;
+ {$IFDEF grid_use_buckets}
+ f: Integer;
+ {$ENDIF}
+ cc: PGridCell = nil;
+ px: PBodyProxyRec;
+ lq: LongWord;
+ tsize, gw: Integer;
+ x0, y0: Integer;
begin
result := false;
- if not assigned(cb) then exit;
+ if (w < 1) or (h < 1) or not assigned(cb) then exit;
+
+ x0 := x;
+ y0 := y;
+
+ // fix coords
+ Dec(x, mMinX);
+ Dec(y, mMinY);
+
+ gw := mWidth;
+ tsize := mTileSize;
+
+ if (x+w <= 0) or (y+h <= 0) then exit;
+ if (x >= gw*tsize) or (y >= mHeight*tsize) then exit;
// increase query counter
Inc(mLastQuery);
for idx := 0 to High(mProxies) do mProxies[idx].mQueryMark := 0;
end;
//e_WriteLog(Format('grid: query #%d: (%d,%d)-(%dx%d)', [mLastQuery, minx, miny, maxx, maxy]), MSG_NOTIFY);
+ lq := mLastQuery;
- otagmask := mTagMask;
- mTagMask := tagmask;
- ocb := mItCB;
- mItCB := cb;
- result := forGridRect(x, y, w, h, iterator);
- mTagMask := otagmask;
- mItCB := ocb;
+ // go on
+ for gy := y div tsize to (y+h-1) div tsize do
+ begin
+ if (gy < 0) then continue;
+ if (gy >= mHeight) then break;
+ for gx := x div tsize to (x+w-1) div tsize do
+ begin
+ if (gx < 0) then continue;
+ if (gx >= gw) then break;
+ // process cells
+ curci := mGrid[gy*gw+gx];
+ while (curci <> -1) do
+ begin
+ cc := @mCells[curci];
+ {$IFDEF grid_use_buckets}
+ for f := 0 to High(TGridCell.bodies) do
+ begin
+ if (cc.bodies[f] = -1) then break;
+ px := @mProxies[cc.bodies[f]];
+ if (px.mQueryMark <> lq) and ((px.mTag and tagmask) <> 0) 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;
+ result := cb(px.mObj, px.mTag);
+ if result then exit;
+ end;
+ end;
+ {$ELSE}
+ if (cc.body <> 1) then
+ begin
+ px := @mProxies[cc.body];
+ if (px.mQueryMark <> lq) and ((px.mTag and tagmask) <> 0) then
+ begin
+ if (x0 >= px.mX+px.mWidth) or (y0 >= px.mY+px.mHeight) or (x0+w <= px.mX) or (y0+h <= px.mY) then
+ begin
+ // no intersection
+ end
+ else
+ begin
+ px.mQueryMark := lq;
+ result := cb(px.mObj, px.mTag);
+ if result then exit;
+ end;
+ end;
+ end;
+ {$ENDIF}
+ curci := cc.next;
+ end;
+ end;
+ end;
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.traceRay (x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): Boolean;
+var
+ i: Integer;
+ dx, dy: Integer;
+ xerr: Integer = 0;
+ yerr: Integer = 0;
+ d: Integer;
+ incx, incy: Integer;
+ x, y: Integer;
+ maxx, maxy: Integer;
+ tsize: Integer; // tile size
+ gw, gh: Integer;
+ lastGA: Integer = -1;
+ ga: Integer = -1; // last used grid address
+ ccidx: Integer = -1;
+ curci: Integer = -1;
+ cc: PGridCell = nil;
+ hasUntried: Boolean;
+ f: Integer;
+ px: PBodyProxyRec;
+ lq: LongWord;
+ prevX, prevY: Integer;
+ minx, miny: Integer;
+begin
+ result := false;
+
+ if (tagmask = 0) then exit;
+
+ // make coords (0,0)-based
+ minx := mMinX;
+ miny := mMinY;
+ Dec(x0, minx);
+ Dec(y0, miny);
+ Dec(x1, minx);
+ Dec(y1, miny);
+
+ 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;
+
+ dx := abs(dx);
+ dy := abs(dy);
+
+ if (dx > dy) then d := dx else d := dy;
+
+ x := x0;
+ y := y0;
+
+ // 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;
+
+ tsize := mTileSize;
+ gw := mWidth;
+ gh := mHeight;
+ maxx := gw*tsize-1;
+ maxy := gh*tsize-1;
+
+ for i := 1 to d do
+ begin
+ prevX := x+minx;
+ prevY := y+miny;
+ Inc(xerr, dx); if (xerr >= d) then begin Dec(xerr, d); Inc(x, incx); end;
+ Inc(yerr, dy); if (yerr >= d) then begin Dec(yerr, d); Inc(y, incy); end;
+
+ if (x >= 0) and (y >= 0) and (x <= maxx) and (y <= maxy) then
+ begin
+ ga := (y div tsize)*gw+(x div tsize);
+ if (lastGA <> ga) then
+ begin
+ // new cell
+ lastGA := ga;
+ ccidx := mGrid[lastGA];
+ {
+ if (ccidx <> -1) then
+ begin
+ result := cb(nil, 0, x+minx, y+miny, prevX, prevY);
+ if result then exit;
+ end;
+ }
+ end;
+ end
+ else
+ begin
+ if (ccidx <> -1) then
+ begin
+ ccidx := -1;
+ result := cb(nil, 0, x+minx, y+miny, prevX, prevY);
+ if result then exit;
+ end;
+ end;
+
+ if (ccidx <> -1) then
+ begin
+ curci := ccidx;
+ hasUntried := false;
+ Inc(x, minx);
+ Inc(y, miny);
+ while (curci <> -1) do
+ begin
+ cc := @mCells[curci];
+ {$IFDEF grid_use_buckets}
+ for f := 0 to High(TGridCell.bodies) do
+ begin
+ if (cc.bodies[f] = -1) then break;
+ px := @mProxies[cc.bodies[f]];
+ if (px.mQueryMark <> lq) and ((px.mTag and tagmask) <> 0) then
+ begin
+ if (x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight) then
+ begin
+ px.mQueryMark := lq;
+ result := cb(px.mObj, px.mTag, x, y, prevX, prevY);
+ if result then exit;
+ end
+ else
+ begin
+ hasUntried := true;
+ end;
+ end;
+ end;
+ {$ELSE}
+ if (cc.body <> -1) then
+ begin
+ px := @mProxies[cc.body];
+ if (px.mQueryMark <> lq) and ((px.mTag and tagmask) <> 0) 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;
+ result := cb(px.mObj, px.mTag, x, y, prevX, prevY);
+ if result then exit;
+ end
+ else
+ begin
+ hasUntried := true;
+ end;
+ end;
+ end;
+ {$ENDIF}
+ curci := cc.next;
+ end;
+ if not hasUntried then
+ begin
+ // don't process this cell anymore
+ ccidx := -1;
+ result := cb(nil, 0, x, y, prevX, prevY);
+ if result then exit;
+ end;
+ Dec(x, minx);
+ Dec(y, miny);
+ end;
+ end;
end;