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raw | patch | inline | side by side (parent: 0944e70)
raw | patch | inline | side by side (parent: 0944e70)
| author | Ketmar Dark <ketmar@ketmar.no-ip.org> | |
| Tue, 5 Sep 2017 19:53:48 +0000 (22:53 +0300) | ||
| committer | Ketmar Dark <ketmar@ketmar.no-ip.org> | |
| Tue, 5 Sep 2017 19:56:20 +0000 (22:56 +0300) |
| src/game/g_grid.pas | patch | blob | history |
diff --git a/src/game/g_grid.pas b/src/game/g_grid.pas
index 99533e9db18b18444f4634429499566071c761fd..55feca9a094f1ac89568f79b79e78f5ab2e72d93 100644 (file)
--- a/src/game/g_grid.pas
+++ b/src/game/g_grid.pas
// ////////////////////////////////////////////////////////////////////////// //
function TBodyGridBase.forGridRect (x, y, w, h: Integer; cb: TGridInternalCB; bodyId: TBodyProxyId): Boolean;
-const
- tsize = mTileSize;
var
gx, gy: Integer;
gw, gh: Integer;
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
+ if (x >= gw*mTileSize) or (y >= gh*mTileSize) then exit;
+ for gy := y div mTileSize to (y+h-1) div mTileSize do
begin
if (gy < 0) then continue;
if (gy >= gh) then break;
- for gx := x div tsize to (x+w-1) div tsize do
+ for gx := x div mTileSize to (x+w-1) div mTileSize do
begin
if (gx < 0) then continue;
if (gx >= gw) then break;
// ////////////////////////////////////////////////////////////////////////// //
// 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;
//tsize := mTileSize;
if (x+w <= 0) or (y+h <= 0) then exit;
- if (x >= gw*tsize) or (y >= mHeight*tsize) then exit;
+ if (x >= gw*mTileSize) or (y >= mHeight*mTileSize) then exit;
if mInQuery then raise Exception.Create('recursive queries aren''t supported');
mInQuery := true;
lq := mLastQuery;
// go on
- for gy := y div tsize to (y+h-1) div tsize do
+ for gy := y div mTileSize to (y+h-1) div mTileSize do
begin
if (gy < 0) then continue;
if (gy >= mHeight) then break;
- for gx := x div tsize to (x+w-1) div tsize do
+ for gx := x div mTileSize to (x+w-1) div mTileSize do
begin
if (gx < 0) then continue;
if (gx >= gw) then break;
// ////////////////////////////////////////////////////////////////////////// //
-// 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;
-const
- tsize = mTileSize;
+function TBodyGridBase.forEachAlongLine (ax0, ay0, ax1, ay1: Integer; cb: TGridQueryCB; tagmask: Integer=-1; log: Boolean=false): 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;
+ lw: TLineWalker;
+ ccidx: 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;
+ 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);
- 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;
+ if (tagmask = 0) or not assigned(cb) then exit;
gw := mWidth;
gh := mHeight;
minx := mMinX;
miny := mMinY;
- maxx := gw*tsize-1;
- maxy := gh*tsize-1;
-
- {$IF DEFINED(D2F_DEBUG_RAYTRACE)}
- if assigned(dbgRayTraceTileHitCB) then e_WriteLog(Format('TRACING: (%d,%d)-(%d,%d) [(%d,%d)-(%d,%d)]; maxdistsq=%d', [ax0, ay0, ax1, ay1, minx, miny, maxx, maxy, lastDistSq]), MSG_NOTIFY);
- {$ENDIF}
- x0 := ax0;
- y0 := ay0;
- x1 := ax1;
- y1 := ay1;
+ // make query coords (0,0)-based
+ x0 := ax0-minx;
+ y0 := ay0-miny;
+ x1 := ax1-minx;
+ y1 := ay1-miny;
- // offset query coords to (0,0)-based
- Dec(x0, minx);
- Dec(y0, miny);
- Dec(x1, minx);
- Dec(y1, 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
- // clip rectange
- wx0 := 0;
- wy0 := 0;
- wx1 := maxx;
- wy1 := maxy;
+ if mInQuery then raise Exception.Create('recursive queries aren''t supported');
+ mInQuery := true;
- // 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
+ // increase query counter
+ Inc(mLastQuery);
+ if (mLastQuery = 0) then
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);
+ // just in case of overflow
+ mLastQuery := 1;
+ for f := 0 to High(mProxies) do mProxies[f].mQueryMark := 0;
end;
+ lq := mLastQuery;
- // 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;
+ 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();
- dsx := x1-x0;
- dsy := y1-y0;
+ mInQuery := false;
+end;
- 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;
+// ////////////////////////////////////////////////////////////////////////// //
+// 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;
- xfixed := false;
- if (y0 < wy0) then
+ 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
- // 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;
+ // just in case of overflow
+ mLastQuery := 1;
+ for f := 0 to High(mProxies) do mProxies[f].mQueryMark := 0;
end;
+ lq := mLastQuery;
- if (not xfixed) and (x0 < wx0) then
+ for gy := cy0 div mTileSize to cy1 div mTileSize do
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;
+ 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 (y1 > wy1) then
+ if (minu0 <= 1.0) 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);
+ 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;
- if (term > wx1) then term := wx1; // clip at right
+ mInQuery := false;
+end;
- 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;
+// ////////////////////////////////////////////////////////////////////////// //
+{.$DEFINE D2F_DEBUG_OTR}
+function TBodyGridBase.traceOrthoRayWhileIn (out ex, ey: Integer; ax0, ay0, ax1, ay1: Integer; tagmask: Integer=-1): Boolean;
+var
+ ccidx: Integer;
+ cc: PGridCell;
+ px: PBodyProxyRec;
+ ptag: Integer;
+ minx, miny: Integer;
+ f, c0, c1: Integer;
+ x0, y0, x1, y1: Integer;
+ celly0, celly1: Integer;
+ dy: Integer;
+ filled: array[0..mTileSize-1] of Byte;
+ {$IF DEFINED(D2F_DEBUG_OTR)}
+ s: AnsiString = '';
+ {$ENDIF}
+begin
+ result := false;
+ ex := ax1;
+ ey := ay1;
+ if not ((ax0 = ax1) or (ay0 = ay1)) then raise Exception.Create('orthoray is not orthogonal');
- // first move, to skip starting point
- // DON'T DO THIS! loop will take care of that
- if (xd = term) then
+ tagmask := tagmask and TagFullMask;
+ if (tagmask = 0) then exit;
+
+ if (forEachAtPoint(ax0, ay0, nil, tagmask) = nil) then exit;
+
+ minx := mMinX;
+ miny := mMinY;
+
+ // offset query coords to (0,0)-based
+ x0 := ax0-minx;
+ y0 := ay0-miny;
+ x1 := ax1-minx;
+ y1 := ay1-miny;
+
+ if (x0 = x1) then
begin
- //FIXME!
- result := forEachAtPoint(ax0, ay0, nil, tagmask, @ptag);
- if (result <> nil) then
+ if (x0 < 0) or (x0 >= mWidth*mTileSize) then exit; // oops
+ // vertical
+ if (y0 < y1) then
begin
- if assigned(cb) then
+ // down
+ if (y1 < 0) or (y0 >= mHeight*mTileSize) then exit;
+ //if (ay0 < 0) then ay0 := 0;
+ if (y0 < 0) then exit;
+ if (y1 >= mHeight*mTileSize) then y1 := mHeight*mTileSize-1;
+ dy := 1;
+ end
+ else
+ begin
+ // up
+ if (y0 < 0) or (y1 >= mHeight*mTileSize) then exit;
+ //if (ay1 < 0) then ay1 := 0;
+ if (y1 < 0) then exit;
+ if (y0 >= mHeight*mTileSize) then y0 := mHeight*mTileSize-1;
+ dy := -1;
+ end;
+ // check tile
+ while true do
+ begin
+ ccidx := mGrid[(y0 div mTileSize)*mWidth+(x0 div mTileSize)];
+ FillChar(filled, sizeof(filled), 0);
+ celly0 := y0 and (not (mTileSize-1));
+ celly1 := celly0+mTileSize-1;
+ while (ccidx <> -1) do
begin
- if cb(result, ptag, ax0, ay0, ax0, ay0) then
+ cc := @mCells[ccidx];
+ for f := 0 to GridCellBucketSize-1 do
begin
- ex := ax0;
- ey := ay0;
- end
- else
+ if (cc.bodies[f] = -1) then break;
+ px := @mProxies[cc.bodies[f]];
+ ptag := px.mTag;
+ if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and
+ (ax0 >= px.x0) and (ax0 <= px.x1) then
+ begin
+ // bound c0 and c1 to cell
+ c0 := nclamp(px.y0-miny, celly0, celly1);
+ c1 := nclamp(px.y1-miny, celly0, celly1);
+ // fill the thing
+ {$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);
+ {$ENDIF}
+ // now go till we hit cell boundary or empty space
+ if (dy < 0) then
+ begin
+ // up
+ while (y0 >= celly0) and (filled[y0-celly0] <> 0) do
begin
- result := nil;
+ {$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]);
+ {$ENDIF}
+ if (ay0 <= ay1) then begin ey := ay1; result := false; exit; end;
+ if (y0 >= celly0) then begin ey := ay0+1; {assert(forEachAtPoint(ex, ey, nil, tagmask) <> nil);} result := true; exit; end;
end
else
begin
- ex := ax0;
- ey := ay0;
+ // down
+ while (y0 <= celly1) and (filled[y0-celly0] <> 0) do begin Inc(y0); Inc(ay0); end;
+ if (ay0 >= ay1) then begin ey := ay1; result := false; exit; end;
+ if (y0 <= celly1) then begin ey := ay0-1; result := true; exit; end;
end;
end;
- exit;
+ end
+ else
+ begin
+ // horizontal
+ assert(false);
end;
+end;
- prevx := xptr^+minx;
- prevy := yptr^+miny;
- (*
- // move coords
- if (e >= 0) then begin yd += sty; e -= dx2; end else e += dy2;
- xd += stx;
- // done?
- if (xd = term) then exit;
- *)
- {$IF DEFINED(D2F_DEBUG)}
- if (xptr^ < 0) or (yptr^ < 0) or (xptr^ >= gw*tsize) and (yptr^ >= gh*tsize) then raise Exception.Create('raycaster internal error (0)');
- {$ENDIF}
- // DON'T DO THIS! loop will take care of that
- //lastGA := (yptr^ div tsize)*gw+(xptr^ div tsize);
- //ccidx := mGrid[lastGA];
+// ////////////////////////////////////////////////////////////////////////// //
+function TBodyGridBase.traceRay (const x0, y0, x1, y1: Integer; cb: TGridQueryCB; tagmask: Integer=-1): ITP;
+var
+ ex, ey: Integer;
+begin
+ result := traceRay(ex, ey, x0, y0, x1, y1, cb, tagmask);
+end;
- {$IF DEFINED(D2F_DEBUG_RAYTRACE)}
- //if assigned(dbgRayTraceTileHitCB) then e_WriteLog('1:TRACING!', MSG_NOTIFY);
- {$ENDIF}
- //if (dbgShowTraceLog) then e_WriteLog(Format('raycast start: (%d,%d)-(%d,%d); xptr^=%d; yptr^=%d', [ax0, ay0, ax1, ay1, xptr^, yptr^]), MSG_NOTIFY);
+// no callback: return `true` on the nearest hit
+// you are not supposed to understand this
+function TBodyGridBase.traceRay (out ex, ey: Integer; const ax0, ay0, ax1, ay1: Integer; cb: TGridQueryCB; tagmask: Integer=-1): ITP;
+var
+ lw, sweepw: TLineWalker;
+ ccidx: Integer;
+ cc: PGridCell;
+ px: PBodyProxyRec;
+ lq: LongWord;
+ f, ptag: Integer;
+ gw, gh, minx, miny: Integer;
+ x0, y0: Integer;
+ x1, y1: Integer;
+ cx, cy: Integer;
+ px0, py0, px1, py1: Integer;
+ lastDistSq, distSq, hx, hy: Integer;
+ firstCell: Boolean = true;
+ wasHit: Boolean;
+begin
+ result := Default(ITP);
+ tagmask := tagmask and TagFullMask;
+ if (tagmask = 0) then exit;
- if mInQuery then raise Exception.Create('recursive queries aren''t supported');
- mInQuery := true;
+ gw := mWidth;
+ gh := mHeight;
+ minx := mMinX;
+ miny := mMinY;
- // increase query counter
- Inc(mLastQuery);
- if (mLastQuery = 0) then
- begin
- // just in case of overflow
- mLastQuery := 1;
- for f := 0 to High(mProxies) do mProxies[f].mQueryMark := 0;
- end;
- lq := mLastQuery;
+ // make query coords (0,0)-based
+ x0 := ax0-minx;
+ y0 := ay0-miny;
+ x1 := ax1-minx;
+ y1 := ay1-miny;
- {$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 tsize)*gw+(xptr^ div tsize);
- // 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;
- {$ENDIF}
+ lw := TLineWalker.Create(0, 0, gw*mTileSize-1, gh*mTileSize-1);
+ if not lw.setup(x0, y0, x1, y1) then exit; // out of screen
- {$IF DEFINED(D2F_DEBUG_RAYTRACE)}
- if assigned(dbgRayTraceTileHitCB) then dbgRayTraceTileHitCB((xptr^ div tsize*tsize)+minx, (yptr^ div tsize*tsize)+miny);
- {$ENDIF}
+ sweepw := TLineWalker.Create(0, 0, 1, 1); // doesn't matter, just shut ups the compiler
- //e_LogWritefln('*********************', []);
- ccidx := -1;
- // can omit checks
- while (xd <> term) do
+ lastDistSq := distanceSq(ax0, ay0, ax1, ay1)+1;
+
+ if mInQuery then raise Exception.Create('recursive queries aren''t supported');
+ mInQuery := true;
+
+ // increase query counter
+ Inc(mLastQuery);
+ if (mLastQuery = 0) then
begin
- // check cell(s)
- {$IF DEFINED(D2F_DEBUG)}
- if (xptr^ < 0) or (yptr^ < 0) or (xptr^ >= gw*tsize) and (yptr^ >= gh*tsize) then raise Exception.Create('raycaster internal error (0)');
- {$ENDIF}
- // new tile?
- ga := (yptr^ div tsize)*gw+(xptr^ div tsize);
- {$IF DEFINED(D2F_DEBUG_RAYTRACE)}
- if assigned(dbgRayTraceTileHitCB) then e_WriteLog(Format(' xd=%d; term=%d; gx=%d; gy=%d; ga=%d; lastga=%d', [xd, term, xptr^, yptr^, ga, lastGA]), MSG_NOTIFY);
- {$ENDIF}
- if (ga <> lastGA) then
- begin
- // yes
- {$IF DEFINED(D2F_DEBUG)}
- if assigned(dbgRayTraceTileHitCB) then dbgRayTraceTileHitCB((xptr^ div tsize*tsize)+minx, (yptr^ div tsize*tsize)+miny);
- {$ENDIF}
- if (ccidx <> -1) then
- begin
- // signal cell completion
- if assigned(cb) then
- begin
- if cb(nil, 0, xptr^+minx, yptr^+miny, prevx, prevy) then begin result := lastObj; mInQuery := false; exit; end;
- end
- else if wasHit then
- begin
- result := lastObj;
- mInQuery := false;
- exit;
- end;
- end;
- lastGA := ga;
- ccidx := mGrid[lastGA];
- end;
- // has something to process in this tile?
- if (ccidx <> -1) then
+ // just in case of overflow
+ mLastQuery := 1;
+ for f := 0 to High(mProxies) do mProxies[f].mQueryMark := 0;
+ end;
+ lq := mLastQuery;
+
+ repeat
+ lw.getXY(cx, cy);
+ // check tile
+ ccidx := mGrid[(cy div mTileSize)*gw+(cx div mTileSize)];
+ // process cells
+ wasHit := false;
+ while (ccidx <> -1) do
begin
- // process cell
- curci := ccidx;
- hasUntried := false; // this will be set to `true` if we have some proxies we still want to process at the next step
- // convert coords to map (to avoid ajdusting coords inside the loop)
- x := xptr^+minx;
- y := yptr^+miny;
- // process cell list
- while (curci <> -1) do
+ cc := @mCells[ccidx];
+ for f := 0 to GridCellBucketSize-1 do
begin
- cc := @mCells[curci];
- for f := 0 to GridCellBucketSize-1 do
- begin
- if (cc.bodies[f] = -1) then break;
- px := @mProxies[cc.bodies[f]];
- ptag := px.mTag;
- if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) then
- begin
- // can we process this proxy?
- if (x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight) then
- begin
- px.mQueryMark := lq; // mark as processed
- if assigned(cb) then
- begin
- if cb(px.mObj, ptag, x, y, prevx, prevy) then
- begin
- result := px.mObj;
- ex := prevx;
- ey := prevy;
- mInQuery := false;
- exit;
- end;
- end
- else
- begin
- // remember this hitpoint if it is nearer than an old one
- distSq := distanceSq(ax0, ay0, prevx, prevy);
- {$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
+ 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;
+ // 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;
+ exit;
+ end;
+ // do line-vs-aabb test
+ sweepw.setClip(px0, py0, px1, py1);
+ if sweepw.setup(x0, y0, x1, y1) then
+ begin
+ // hit detected
+ sweepw.getPrevXY(hx, hy);
+ distSq := distanceSq(x0, y0, hx, hy);
+ if (distSq < lastDistSq) then
begin
- // this is possibly interesting proxy, set "has more to check" flag
- hasUntried := true;
+ lastDistSq := distSq;
+ ex := hx+minx;
+ ey := hy+miny;
+ result := px.mObj;
+ // if this is not a first cell, get outta here
+ if not firstCell then begin mInQuery := false; exit; end;
+ wasHit := 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;
+ // next cell
+ ccidx := cc.next;
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;
+ // 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;
// ////////////////////////////////////////////////////////////////////////// //
-//FIXME! optimize this with real tile walking
-function TBodyGridBase.forEachAlongLine (ax0, ay0, ax1, ay1: Integer; cb: TGridQueryCB; tagmask: Integer=-1; log: Boolean=false): ITP;
-const
- tsize = mTileSize;
+// 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
xptr, yptr: PInteger;
xfixed: Boolean;
temp: Integer;
+ prevx, prevy: Integer;
+ lastDistSq: Integer;
ccidx, curci: Integer;
+ hasUntried: Boolean;
lastGA: Integer = -1;
- ga: Integer;
+ ga, x, y: Integer;
+ lastObj: ITP;
+ wasHit: Boolean = false;
gw, gh, minx, miny, maxx, maxy: Integer;
cc: PGridCell;
px: PBodyProxyRec;
lq: LongWord;
- f, ptag: Integer;
+ f, ptag, distSq: Integer;
x0, y0, x1, y1: Integer;
//swapped: Boolean = false; // true: xd is yd, and vice versa
// horizontal walker
// skipper
xdist, ydist: Integer;
begin
- log := false;
result := Default(ITP);
+ lastObj := Default(ITP);
tagmask := tagmask and TagFullMask;
- if (tagmask = 0) or not assigned(cb) then exit;
+ 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, cb, tagmask, @ptag);
+ result := forEachAtPoint(ax0, ay0, nil, tagmask, @ptag);
+ if (result <> nil) then
+ begin
+ if assigned(cb) and not cb(result, ptag, ax0, ay0, ax0, ay0) then result := Default(ITP);
+ end;
exit;
end;
+ lastDistSq := distanceSq(ax0, ay0, ax1, ay1)+1;
+
gw := mWidth;
gh := mHeight;
minx := mMinX;
miny := mMinY;
- maxx := gw*tsize-1;
- maxy := gh*tsize-1;
+ 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);
+ {$ENDIF}
x0 := ax0;
y0 := ay0;
// DON'T DO THIS! loop will take care of that
if (xd = term) then
begin
- result := forEachAtPoint(ax0, ay0, cb, tagmask, @ptag);
+ //FIXME!
+ result := forEachAtPoint(ax0, ay0, nil, tagmask, @ptag);
+ if (result <> nil) then
+ begin
+ if assigned(cb) then
+ begin
+ if cb(result, ptag, ax0, ay0, ax0, ay0) then
+ begin
+ ex := ax0;
+ ey := ay0;
+ end
+ else
+ begin
+ result := nil;
+ end;
+ end
+ else
+ begin
+ ex := ax0;
+ ey := ay0;
+ end;
+ end;
exit;
end;
+ prevx := xptr^+minx;
+ prevy := yptr^+miny;
(*
// move coords
if (e >= 0) then begin yd += sty; e -= dx2; end else e += dy2;
*)
{$IF DEFINED(D2F_DEBUG)}
- if (xptr^ < 0) or (yptr^ < 0) or (xptr^ >= gw*tsize) and (yptr^ >= gh*tsize) then raise Exception.Create('raycaster internal error (0)');
+ 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);
+ {$ENDIF}
+
+ //if (dbgShowTraceLog) then e_WriteLog(Format('raycast start: (%d,%d)-(%d,%d); xptr^=%d; yptr^=%d', [ax0, ay0, ax1, ay1, xptr^, yptr^]), MSG_NOTIFY);
+
if mInQuery then raise Exception.Create('recursive queries aren''t supported');
mInQuery := true;
{$IF DEFINED(D2F_DEBUG)}
if dbgShowTraceLog then e_LogWritefln('optimized htrace; wklen=%d', [wklen]);
{$ENDIF}
- ga := (yptr^ div tsize)*gw+(xptr^ div tsize);
+ ga := (yptr^ div mTileSize)*gw+(xptr^ div mTileSize);
+ // one of those will never change
+ x := xptr^+minx;
+ y := yptr^+miny;
while (wklen > 0) do
begin
{$IF DEFINED(D2F_DEBUG)}
- if dbgShowTraceLog then e_LogWritefln(' htrace; ga=%d; x=%d, y=%d; ay0=%d', [ga, xptr^+minx, yptr^+miny, ay0]);
+ if dbgShowTraceLog then e_LogWritefln(' htrace; ga=%d; x=%d, y=%d; y=%d; y=%d', [ga, xptr^+minx, yptr^+miny, y, ay0]);
{$ENDIF}
// new tile?
if (ga <> lastGA) then
lastGA := ga;
ccidx := mGrid[lastGA];
// convert coords to map (to avoid ajdusting coords inside the loop)
+ if hopt then x := xptr^+minx else y := yptr^+miny;
while (ccidx <> -1) do
begin
cc := @mCells[ccidx];
if (cc.bodies[f] = -1) then break;
px := @mProxies[cc.bodies[f]];
ptag := px.mTag;
- if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) then
+ if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) and
+ // constant coord should be inside
+ ((hopt and (y >= px.y0) and (y <= px.y1)) or
+ ((not hopt) and (x >= px.x0) and (x <= px.x1))) then
begin
px.mQueryMark := lq; // mark as processed
+ // inside the proxy?
+ if (hopt and (x > px.x0) and (x < px.x1)) or
+ ((not hopt) and (y > px.y0) and (y < px.y1)) then
+ begin
+ // setup prev[xy]
+ if assigned(cb) then
+ begin
+ if cb(px.mObj, ptag, x, y, x, y) then
+ begin
+ result := px.mObj;
+ ex := x;
+ ey := y;
+ mInQuery := false;
+ exit;
+ end;
+ end
+ else
+ begin
+ distSq := distanceSq(ax0, ay0, x, y);
+ {$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]);
+ {$ENDIF}
+ if (distSq < lastDistSq) then
+ begin
+ ex := x;
+ ey := y;
+ result := px.mObj;
+ mInQuery := false;
+ exit;
+ end;
+ end;
+ continue;
+ end;
+ // remember this hitpoint if it is nearer than an old one
+ // setup prev[xy]
+ if hopt then
+ begin
+ // horizontal trace
+ prevy := y;
+ y := yptr^+miny;
+ if (stx < 0) then
+ begin
+ // going left
+ if (x < px.x1) then continue; // not on the right edge
+ x := px.x1;
+ prevx := x+1;
+ end
+ else
+ begin
+ // going right
+ if (x > px.x0) then continue; // not on the left edge
+ x := px.x0;
+ prevx := x-1;
+ end;
+ end
+ else
+ begin
+ // vertical trace
+ prevx := x;
+ x := xptr^+minx;
+ if (stx < 0) then
+ begin
+ // going up
+ if (y < px.y1) then continue; // not on the bottom edge
+ y := px.y1;
+ prevy := x+1;
+ end
+ else
+ begin
+ // going down
+ if (y > px.y0) then continue; // not on the top edge
+ y := px.y0;
+ prevy := y-1;
+ end;
+ end;
if assigned(cb) then
begin
- if cb(px.mObj, ptag) then begin result := px.mObj; mInQuery := false; exit; end;
+ if cb(px.mObj, ptag, x, y, prevx, prevy) then
+ begin
+ result := px.mObj;
+ ex := prevx;
+ ey := prevy;
+ mInQuery := false;
+ exit;
+ end;
end
else
begin
- result := px.mObj;
- mInQuery := false;
- exit;
+ distSq := distanceSq(ax0, ay0, prevx, prevy);
+ {$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]);
+ {$ENDIF}
+ if (distSq < lastDistSq) then
+ begin
+ wasHit := true;
+ lastDistSq := distSq;
+ ex := prevx;
+ ey := prevy;
+ lastObj := px.mObj;
+ end;
end;
end;
end;
// next cell
ccidx := cc.next;
end;
+ if wasHit and not assigned(cb) then begin result := lastObj; mInQuery := false; exit; end;
+ if assigned(cb) and cb(nil, 0, x, y, x, y) then begin result := lastObj; mInQuery := false; exit; end;
end;
// skip to next tile
if hopt then
end;
Dec(wklen, wkstep);
end;
+ // we can travel less than one cell
+ if wasHit and not assigned(cb) then result := lastObj else begin ex := ax1; ey := ay1; end;
mInQuery := false;
exit;
end;
{$ENDIF}
{$IF DEFINED(D2F_DEBUG_RAYTRACE)}
- if assigned(dbgRayTraceTileHitCB) then dbgRayTraceTileHitCB((xptr^ div tsize*tsize)+minx, (yptr^ div tsize*tsize)+miny);
+ if assigned(dbgRayTraceTileHitCB) then dbgRayTraceTileHitCB((xptr^ div mTileSize*mTileSize)+minx, (yptr^ div mTileSize*mTileSize)+miny);
{$ENDIF}
+ //e_LogWritefln('*********************', []);
ccidx := -1;
// can omit checks
while (xd <> term) do
begin
// check cell(s)
{$IF DEFINED(D2F_DEBUG)}
- if (xptr^ < 0) or (yptr^ < 0) or (xptr^ >= gw*tsize) and (yptr^ >= gh*tsize) then raise Exception.Create('raycaster internal error (0)');
+ if (xptr^ < 0) or (yptr^ < 0) or (xptr^ >= gw*mTileSize) and (yptr^ >= gh*mTileSize) then raise Exception.Create('raycaster internal error (0)');
{$ENDIF}
// new tile?
- ga := (yptr^ div tsize)*gw+(xptr^ div tsize);
+ 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}
begin
// yes
{$IF DEFINED(D2F_DEBUG)}
- if assigned(dbgRayTraceTileHitCB) then dbgRayTraceTileHitCB((xptr^ div tsize*tsize)+minx, (yptr^ div tsize*tsize)+miny);
+ if assigned(dbgRayTraceTileHitCB) then dbgRayTraceTileHitCB((xptr^ div mTileSize*mTileSize)+minx, (yptr^ div mTileSize*mTileSize)+miny);
{$ENDIF}
- lastGA := ga;
- ccidx := mGrid[lastGA];
- end;
- // has something to process in this tile?
- if (ccidx <> -1) then
- begin
- // process cell
- curci := ccidx;
- // process cell list
- while (curci <> -1) do
+ if (ccidx <> -1) then
begin
- cc := @mCells[curci];
- for f := 0 to GridCellBucketSize-1 do
+ // signal cell completion
+ if assigned(cb) then
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 cb(px.mObj, ptag) then begin result := px.mObj; mInQuery := false; exit; end;
- end
- else
- begin
- result := px.mObj;
- mInQuery := false;
- exit;
- end;
- end;
- end;
- // next cell
- curci := cc.next;
- end;
- // nothing more interesting in this cell
- ccidx := -1;
- end;
- // 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;
- //putPixel(xptr^, yptr^);
- // move coords
- if (e >= 0) then begin yd += sty; e -= dx2; end else e += dy2;
- xd += stx;
- end;
-
- 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;
-
- if mInQuery then raise Exception.Create('recursive queries aren''t supported');
- mInQuery := true;
-
- 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;
-
- // 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
+ if cb(nil, 0, xptr^+minx, yptr^+miny, prevx, prevy) then begin result := lastObj; mInQuery := false; exit; end;
+ end
+ else if wasHit then
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;
+ result := lastObj;
+ mInQuery := false;
+ exit;
end;
- // next cell
- ccidx := cc.next;
end;
+ lastGA := ga;
+ ccidx := mGrid[lastGA];
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
+ // has something to process in this tile?
+ if (ccidx <> -1) then
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
+ // 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[ccidx];
+ 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
- (ax0 >= px.x0) and (ax0 <= px.x1) then
+ if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) 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)]);
- {$ENDIF}
- //assert(c0 <= c1);
- FillChar(filled[c0-celly0], c1-c0+1, 1);
+ // can we process this proxy?
+ if (x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight) then
+ begin
+ px.mQueryMark := lq; // mark as processed
+ if assigned(cb) then
+ begin
+ if cb(px.mObj, ptag, x, y, prevx, prevy) then
+ begin
+ result := px.mObj;
+ ex := prevx;
+ ey := prevy;
+ mInQuery := false;
+ exit;
+ end;
+ end
+ else
+ begin
+ // remember this hitpoint if it is nearer than an old one
+ distSq := distanceSq(ax0, ay0, prevx, prevy);
+ {$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);
+ {$ENDIF}
+ if (distSq < lastDistSq) then
+ begin
+ wasHit := true;
+ lastDistSq := distSq;
+ ex := prevx;
+ ey := prevy;
+ lastObj := px.mObj;
+ end;
+ end;
+ end
+ else
+ begin
+ // this is possibly interesting proxy, set "has more to check" flag
+ hasUntried := true;
+ end;
end;
end;
// next cell
- ccidx := cc.next;
+ curci := cc.next;
end;
- {$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);
- {$ENDIF}
- // now go till we hit cell boundary or empty space
- if (dy < 0) then
+ // still has something interesting in this cell?
+ if not hasUntried then
begin
- // up
- while (y0 >= celly0) and (filled[y0-celly0] <> 0) do
+ // nope, don't process this cell anymore; signal cell completion
+ ccidx := -1;
+ if assigned(cb) then
begin
- {$IF DEFINED(D2F_DEBUG_OTR)}
- e_LogWritefln(' filled: cdy=%s; y0=%s; celly0=%s; ay0=%s; ay1=%s', [y0-celly0, y0, celly0, ay0, ay1]);
- {$ENDIF}
- Dec(y0);
- Dec(ay0);
+ if cb(nil, 0, x, y, prevx, prevy) then begin result := lastObj; mInQuery := false; exit; end;
+ end
+ else if wasHit then
+ begin
+ result := lastObj;
+ mInQuery := false;
+ exit;
end;
- {$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
+ 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
- // 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;
+ // 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
- // 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, sweepw: TLineWalker;
- ccidx: Integer;
- gw, gh, minx, miny: Integer;
- cc: PGridCell;
- px: PBodyProxyRec;
- lq: LongWord;
- f, ptag: Integer;
- x0, y0, x1, y1, cx, cy, 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 to (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
-
- sweepw := TLineWalker.Create(0, 0, 1, 1); // doesn't matter, just shut ups the compiler
-
- lastDistSq := distanceSq(ax0, ay0, ax1, ay1)+1;
-
- 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;
+ ex := ax1; // why not?
+ ey := ay1; // why not?
end;
- lq := mLastQuery;
-
- ccidx := -1;
- repeat
- lw.getXY(cx, cy);
- // 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;
- // 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;
- exit;
- end;
- // do line-vs-aabb test
- sweepw.setClip(px0, py0, px1, py1);
- if sweepw.setup(x0, y0, x1, y1) then
- begin
- // hit detected
- sweepw.getPrevXY(hx, hy);
- distSq := distanceSq(x0, y0, hx, hy);
- if (distSq < lastDistSq) then
- begin
- lastDistSq := distSq;
- ex := hx+minx;
- ey := hy+miny;
- result := px.mObj;
- // if this is not a first cell, get outta here
- if not firstCell then begin mInQuery := false; exit; end;
- 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;