X-Git-Url: http://deadsoftware.ru/gitweb?a=blobdiff_plain;f=src%2Fgame%2Fg_grid.pas;h=280fd90f3fd967f0753a31ee69cb6386ceb5fd05;hb=254041134b399e948e554ae99171174a7087ae40;hp=99533e9db18b18444f4634429499566071c761fd;hpb=0944e70467355a7771d42015b6e548050e6fa3b7;p=d2df-sdl.git diff --git a/src/game/g_grid.pas b/src/game/g_grid.pas index 99533e9..280fd90 100644 --- a/src/game/g_grid.pas +++ b/src/game/g_grid.pas @@ -142,9 +142,6 @@ type 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; @@ -327,6 +324,7 @@ uses // ////////////////////////////////////////////////////////////////////////// // procedure swapInt (var a: Integer; var b: Integer); inline; var t: Integer; begin t := a; a := b; b := t; end; +//procedure swapInt (var a: Integer; var b: Integer); inline; begin a := a xor b; b := b xor a; a := a xor b; end; //function minInt (a, b: Integer): Integer; inline; begin if (a < b) then result := a else result := b; end; //function maxInt (a, b: Integer): Integer; inline; begin if (a > b) then result := a else result := b; end; @@ -357,69 +355,100 @@ begin result := (xd = term); end; -// move to next tile; return `true` if the line is complete (and walker state is undefined then) function TLineWalker.stepToNextTile (): Boolean; inline; var - ex, ey, wklen, f: Integer; + ex, ey: Integer; + xwalk, ywalk, wklen: Integer; // to the respective edges + lstx, lsty, lterm: Integer; + le, ldx2, ldy2: Integer; + lxd, lyd: Integer; + f: Integer; begin result := false; - //writeln('stx=', stx, '; sty=', sty); + lstx := stx; + lsty := sty; + lterm := term; + lxd := xd; // ortho? - if (sty = 0) then + if (lsty = 0) then begin // only xd - assert(sty <> 0); - if (stx < 0) then + //assert(lsty <> 0); + if (lstx < 0) then begin // xd: to left edge - xd := (xd and (not (TileSize-1)))-1; - result := (xd <= term); + xd := (lxd and (not (TileSize-1)))-1; + result := (lxd <= lterm); exit; end else begin // xd: to right edge - xd := (xd or (TileSize-1))+1; - result := (xd >= term); + xd := (lxd or (TileSize-1))+1; + result := (lxd >= lterm); exit; end; end; - assert(stx <> 0); // invariant - // not ortho - if (sty < 0) then ey := (yd and (not (TileSize-1)))-1 else ey := (yd or (TileSize-1))+1; + //assert(lstx <> 0); // invariant - //FIXME: do some math to avoid single-stepping - if (stx < 0) then + lyd := yd; + le := e; + ldx2 := dx2; + ldy2 := dy2; + + // calculate xwalk + if (lstx < 0) then begin - // xd: to left edge - ex := (xd and (not (TileSize-1)))-1; - if (ex <= term) then begin result := true; exit; end; - wklen := xd-ex; + ex := (lxd and (not (TileSize-1)))-1; + xwalk := lxd-ex; end else begin - // xd: to right edge - ex := (xd or (TileSize-1))+1; - if (ex >= term) then begin result := true; exit; end; - wklen := ex-xd; + ex := (lxd or (TileSize-1))+1; + xwalk := ex-lxd; end; - //writeln('xd=', xd, '; yd=', yd, '; ex=', ex, '; ey=', ey, '; term=', term, '; wklen=', wklen); - - for f := wklen downto 1 do + // calculate ywalk + if (lsty < 0) then begin - // do step - if (e >= 0) then begin yd += sty; e -= dx2; end else e += dy2; - xd += stx; - if (xd = term) then begin result := true; exit; end; - if (xd = ex) or (yd = ey) then exit; // done + ey := (lyd and (not (TileSize-1)))-1; + ywalk := lyd-ey; + end + else + begin + ey := (lyd or (TileSize-1))+1; + ywalk := ey-lyd; end; - raise Exception.Create('TLineWalker.stepToNextTile: the thing that should not be!'); + while true do + begin + // in which dir we want to walk? + if (xwalk <= ywalk) then wklen := xwalk else wklen := ywalk; + // walk x + if (lstx < 0) then + begin + lxd -= wklen; + if (lxd <= lterm) then begin xd := lxd; result := true; exit; end; + end + else + begin + lxd += wklen; + if (lxd >= lterm) then begin xd := lxd; result := true; exit; end; + end; + // walk y + for f := 1 to wklen do if (le >= 0) then begin lyd += lsty; le -= ldx2; end else le += ldy2; + if (lxd = ex) or (lyd = ey) then break; + xwalk -= wklen; if (xwalk = 0) then xwalk := TileSize; + ywalk -= wklen; if (ywalk = 0) then ywalk := TileSize; + end; + //assert((xd div TileSize <> lxd div TileSize) or (yd div TileSize <> lyd div TileSize)); + xd := lxd; + yd := lyd; + e := le; end; // NOT TESTED! @@ -446,7 +475,7 @@ function TLineWalker.dx (): Integer; inline; begin if xyswapped then result := s function TLineWalker.dy (): Integer; inline; begin if xyswapped then result := sty else result := stx; end; function TLineWalker.setup (x0, y0, x1, y1: Integer): Boolean; - procedure swapInt (var a: Integer; var b: Integer); inline; var t: Integer; begin t := a; a := b; b := t; end; + procedure swapInt (var a: Integer; var b: Integer); inline; begin a := a xor b; b := b xor a; a := a xor b; end; var dsx, dsy: Integer; // "lengthes" for x and y axes rem: Integer; @@ -534,7 +563,8 @@ begin begin yd := wy0; e -= rem+dsx; - if (rem > 0) then begin Inc(xd); e += dy2; end; + //if (rem > 0) then begin Inc(xd); e += dy2; end; //BUGGY + if (xd < wx0) then begin xd += 1; e += dy2; end; //??? xfixed := true; end; end; @@ -691,7 +721,8 @@ begin begin yd := wy0; e -= rem+dsx; - if (rem > 0) then begin Inc(xd); e += dy2; end; + //if (rem > 0) then begin Inc(xd); e += dy2; end; //BUGGY + if (xd < wx0) then begin xd += 1; e += dy2; end; //??? xfixed := true; end; end; @@ -1197,11 +1228,10 @@ end; // ////////////////////////////////////////////////////////////////////////// // function TBodyGridBase.forGridRect (x, y, w, h: Integer; cb: TGridInternalCB; bodyId: TBodyProxyId): Boolean; -const - tsize = mTileSize; var - gx, gy: Integer; gw, gh: Integer; + ex, ey: Integer; + gx, gy: Integer; begin result := false; if (w < 1) or (h < 1) or not assigned(cb) then exit; @@ -1212,16 +1242,22 @@ begin 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 + if (x >= gw*mTileSize) or (y >= gh*mTileSize) then exit; + ex := (x+w-1) div mTileSize; + ey := (y+h-1) div mTileSize; + x := x div mTileSize; + y := y div mTileSize; + // clip rect + if (x < 0) then x := 0 else if (x >= gw) then x := gw-1; + if (y < 0) then y := 0 else if (y >= gh) then y := gh-1; + if (ex < 0) then ex := 0 else if (ex >= gw) then ex := gw-1; + if (ey < 0) then ey := 0 else if (ey >= gh) then ey := gh-1; + if (x > ex) or (y > ey) then exit; // just in case + // do the work + for gy := y to ey do + begin + for gx := x to ex do begin - if (gx < 0) then continue; - if (gx >= gw) then break; result := cb(gy*gw+gx, bodyId); if result then exit; end; @@ -1288,15 +1324,6 @@ begin mGrid[grida] := ccidx; 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; - // assume that we cannot have one object added to bucket twice function TBodyGridBase.remover (grida: Integer; bodyId: TBodyProxyId): Boolean; @@ -1339,29 +1366,25 @@ begin end; end; -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); + //insertInternal(result); + forGridRect(aX, aY, aWidth, aHeight, inserter, result); end; procedure TBodyGridBase.removeBody (body: TBodyProxyId); +var + px: PBodyProxyRec; begin if (body < 0) or (body > High(mProxies)) then exit; // just in case - removeInternal(body); + px := @mProxies[body]; + //removeInternal(body); + forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover, body); freeProxy(body); end; @@ -1390,15 +1413,18 @@ begin // did any corner crossed tile boundary? if (x0 div mTileSize <> nx div mTileSize) or (y0 div mTileSize <> ny div mTileSize) or - ((x0+w) div mTileSize <> (nx+nw) div mTileSize) or - ((y0+h) div mTileSize <> (ny+nh) div mTileSize) then + ((x0+w-1) div mTileSize <> (nx+nw-1) div mTileSize) or + ((y0+h-1) div mTileSize <> (ny+nh-1) div mTileSize) then begin - removeInternal(body); + //writeln('moveResizeBody: cell occupation changed! old=(', x0, ',', y0, ')-(', x0+w-1, ',', y0+h-1, '); new=(', nx, ',', ny, ')-(', nx+nw-1, ',', ny+nh-1, ')'); + //removeInternal(body); + forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover, body); px.mX := nx+mMinX; px.mY := ny+mMinY; px.mWidth := nw; px.mHeight := nh; - insertInternal(body); + //insertInternal(body); + forGridRect(px.mX, px.mY, nw, nh, inserter, body); end else begin @@ -1409,6 +1435,7 @@ begin end; end; + //TODO: optimize for horizontal/vertical moves procedure TBodyGridBase.moveBody (body: TBodyProxyId; nx, ny: Integer); var @@ -1548,6 +1575,7 @@ begin px.mY := ny+mMinY; end; + procedure TBodyGridBase.resizeBody (body: TBodyProxyId; nw, nh: Integer); var px: PBodyProxyRec; @@ -1563,14 +1591,16 @@ begin {$IF DEFINED(D2F_DEBUG_MOVER)} e_WriteLog(Format('proxy #%d: RESIZE: xg=%d;yg=%d;w=%d;h=%d;nw=%d;nh=%d', [body, x0, y0, w, h, nw, nh]), MSG_NOTIFY); {$ENDIF} - if ((x0+w) div mTileSize <> (x0+nw) div mTileSize) or - ((y0+h) div mTileSize <> (y0+nh) div mTileSize) then + if ((x0+w-1) div mTileSize <> (x0+nw-1) div mTileSize) or + ((y0+h-1) div mTileSize <> (y0+nh-1) div mTileSize) then begin // crossed tile boundary, do heavy work - removeInternal(body); + //removeInternal(body); + forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover, body); px.mWidth := nw; px.mHeight := nh; - insertInternal(body); + //insertInternal(body); + forGridRect(px.mX, px.mY, nw, nh, inserter, body); end else begin @@ -1689,17 +1719,16 @@ end; // ////////////////////////////////////////////////////////////////////////// // // no callback: return `true` on the first hit function TBodyGridBase.forEachInAABB (x, y, w, h: Integer; cb: TGridQueryCB; tagmask: Integer=-1; allowDisabled: Boolean=false): ITP; -const - tsize = mTileSize; var idx: Integer; gx, gy: Integer; + sx, sy, ex, ey: Integer; curci: Integer; f: Integer; cc: PGridCell = nil; px: PBodyProxyRec; lq: LongWord; - gw: Integer; + gw, gh: Integer; x0, y0: Integer; ptag: Integer; begin @@ -1716,11 +1745,24 @@ begin Dec(y, mMinY); gw := mWidth; - //tsize := mTileSize; + gh := mHeight; 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 >= gh*mTileSize) then exit; + + sx := x div mTileSize; + sy := y div mTileSize; + ex := (x+w-1) div mTileSize; + ey := (y+h-1) div mTileSize; + + // clip rect + if (sx < 0) then sx := 0 else if (sx >= gw) then sx := gw-1; + if (sy < 0) then sy := 0 else if (sy >= gh) then sy := gh-1; + if (ex < 0) then ex := 0 else if (ex >= gw) then ex := gw-1; + if (ey < 0) then ey := 0 else if (ey >= gh) then ey := gh-1; + if (sx > ex) or (sy > ey) then exit; // just in case + // has something to do if mInQuery then raise Exception.Create('recursive queries aren''t supported'); mInQuery := true; @@ -1736,14 +1778,10 @@ begin lq := mLastQuery; // go on - for gy := y div tsize to (y+h-1) div tsize do + for gy := sy to ey 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 := sx to ex do begin - if (gx < 0) then continue; - if (gx >= gw) then break; // process cells curci := mGrid[gy*gw+gx]; while (curci <> -1) do @@ -1753,7 +1791,7 @@ begin begin if (cc.bodies[f] = -1) then break; px := @mProxies[cc.bodies[f]]; - // shit. has to do it this way, so i can change tag in callback + // shit! has to do it this way, so i can change tag in callback if (px.mQueryMark = lq) then continue; px.mQueryMark := lq; ptag := px.mTag; @@ -1782,657 +1820,473 @@ end; // ////////////////////////////////////////////////////////////////////////// // -// no callback: return `true` on the nearest hit -function TBodyGridBase.traceRayOld (const x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP; -var - ex, ey: Integer; -begin - result := traceRayOld(ex, ey, x0, y0, x1, y1, cb, tagmask); -end; - - -// no callback: return `true` on the nearest hit -// you are not supposed to understand this -function TBodyGridBase.traceRayOld (out ex, ey: Integer; const ax0, ay0, ax1, ay1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP; -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 - begin - // clip at top - temp := dx2*(wy0-y0)-dsx; - xd += temp div dy2; - rem := temp mod dy2; - if (xd > wx1) then exit; // x is moved out of clipping rect, nothing to do - if (xd+1 >= wx0) then - begin - yd := wy0; - e -= rem+dsx; - if (rem > 0) then begin Inc(xd); e += dy2; end; - xfixed := true; - end; - end; + 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); - if (not xfixed) and (x0 < wx0) then - begin - // clip at left - temp := dy2*(wx0-x0); - yd += temp div dx2; - rem := temp mod dx2; - if (yd > wy1) or (yd = wy1) and (rem >= dsx) then exit; - xd := wx0; - e += rem; - if (rem >= dsx) then begin Inc(yd); e -= dx2; end; - end; + cx0 -= mMinX; cy0 -= mMinY; + cx1 -= mMinX; cy1 -= mMinY; - if (y1 > wy1) then - begin - // clip at bottom - temp := dx2*(wy1-y0)+dsx; - term := x0+temp div dy2; - rem := temp mod dy2; - if (rem = 0) then Dec(term); - end; + if (cx1 < 0) or (cy1 < 0) or (cx0 >= mWidth*mTileSize) or (cy0 >= mHeight*mTileSize) then exit; - if (term > wx1) then term := wx1; // clip at right + 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; - Inc(term); // draw last point - //if (term = xd) then exit; // this is the only point, get out of here + if mInQuery then raise Exception.Create('recursive queries aren''t supported'); + mInQuery := true; - if (sty = -1) then yd := -yd; - if (stx = -1) then begin xd := -xd; term := -term; end; - dx2 -= dy2; + // 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; - // first move, to skip starting point - // DON'T DO THIS! loop will take care of that - if (xd = term) then + for gy := cy0 div mTileSize to cy1 div mTileSize do begin - //FIXME! - result := forEachAtPoint(ax0, ay0, nil, tagmask, @ptag); - if (result <> nil) then + for gx := cx0 div mTileSize to cx1 div mTileSize do begin - if assigned(cb) then + ccidx := mGrid[gy*mWidth+gx]; + while (ccidx <> -1) do begin - if cb(result, ptag, ax0, ay0, ax0, ay0) then - begin - ex := ax0; - ey := ay0; - end - else + cc := @mCells[ccidx]; + for f := 0 to GridCellBucketSize-1 do begin - result := nil; + 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; - end - else - begin - ex := ax0; - ey := ay0; + // next cell + ccidx := cc.next; end; end; - exit; end; - prevx := xptr^+minx; - prevy := yptr^+miny; - (* - // move coords - if (e >= 0) then begin yd += sty; e -= dx2; end else e += dy2; - xd += stx; - // done? - if (xd = term) then exit; - *) + if (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; - {$IF DEFINED(D2F_DEBUG)} - if (xptr^ < 0) or (yptr^ < 0) or (xptr^ >= gw*tsize) and (yptr^ >= gh*tsize) then raise Exception.Create('raycaster internal error (0)'); - {$ENDIF} - // DON'T DO THIS! loop will take care of that - //lastGA := (yptr^ div tsize)*gw+(xptr^ div tsize); - //ccidx := mGrid[lastGA]; + mInQuery := false; +end; - {$IF DEFINED(D2F_DEBUG_RAYTRACE)} - //if assigned(dbgRayTraceTileHitCB) then e_WriteLog('1:TRACING!', MSG_NOTIFY); + +// ////////////////////////////////////////////////////////////////////////// // +{.$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'); - //if (dbgShowTraceLog) then e_WriteLog(Format('raycast start: (%d,%d)-(%d,%d); xptr^=%d; yptr^=%d', [ax0, ay0, ax1, ay1, xptr^, yptr^]), MSG_NOTIFY); + tagmask := tagmask and TagFullMask; + if (tagmask = 0) then exit; - if mInQuery then raise Exception.Create('recursive queries aren''t supported'); - mInQuery := true; + if (forEachAtPoint(ax0, ay0, nil, tagmask) = nil) 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; + minx := mMinX; + miny := mMinY; - {$IFDEF GRID_USE_ORTHO_ACCEL} - // if this is strict horizontal/vertical trace, use optimized codepath - if (ax0 = ax1) or (ay0 = ay1) then + // offset query coords to (0,0)-based + x0 := ax0-minx; + y0 := ay0-miny; + x1 := ax1-minx; + y1 := ay1-miny; + + if (x0 = x1) then begin - // horizontal trace: walk the whole tiles, calculating mindist once for each proxy in cell - // stx < 0: going left, otherwise `stx` is > 0, and we're going right - // vertical trace: walk the whole tiles, calculating mindist once for each proxy in cell - // stx < 0: going up, otherwise `stx` is > 0, and we're going down - hopt := (ay0 = ay1); // horizontal? - if (stx < 0) then begin {wksign := -1;} wklen := -(term-xd); end else begin {wksign := 1;} wklen := term-xd; end; - {$IF DEFINED(D2F_DEBUG)} - if dbgShowTraceLog then e_LogWritefln('optimized htrace; wklen=%d', [wklen]); - {$ENDIF} - ga := (yptr^ div tsize)*gw+(xptr^ div tsize); - // one of those will never change - x := xptr^+minx; - y := yptr^+miny; - while (wklen > 0) do + if (x0 < 0) or (x0 >= mWidth*mTileSize) then exit; // oops + // vertical + if (y0 < y1) then begin - {$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]); - {$ENDIF} - // new tile? - if (ga <> lastGA) then + // down + if (y1 < 0) or (y0 >= mHeight*mTileSize) then exit; + //if (ay0 < 0) then ay0 := 0; + if (y0 < 0) then exit; + if (y1 >= mHeight*mTileSize) then y1 := mHeight*mTileSize-1; + dy := 1; + end + else + begin + // up + if (y0 < 0) or (y1 >= mHeight*mTileSize) then exit; + //if (ay1 < 0) then ay1 := 0; + if (y1 < 0) then exit; + if (y0 >= mHeight*mTileSize) then y0 := mHeight*mTileSize-1; + dy := -1; + end; + // check tile + while true do + begin + ccidx := mGrid[(y0 div mTileSize)*mWidth+(x0 div mTileSize)]; + FillChar(filled, sizeof(filled), 0); + celly0 := y0 and (not (mTileSize-1)); + celly1 := celly0+mTileSize-1; + while (ccidx <> -1) do begin - lastGA := ga; - ccidx := mGrid[lastGA]; - // convert coords to map (to avoid ajdusting coords inside the loop) - if hopt then x := xptr^+minx else y := yptr^+miny; - while (ccidx <> -1) do + cc := @mCells[ccidx]; + for f := 0 to GridCellBucketSize-1 do begin - cc := @mCells[ccidx]; - for f := 0 to GridCellBucketSize-1 do + if (cc.bodies[f] = -1) then break; + px := @mProxies[cc.bodies[f]]; + ptag := px.mTag; + if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and + (ax0 >= px.x0) and (ax0 <= px.x1) then begin - if (cc.bodies[f] = -1) then break; - px := @mProxies[cc.bodies[f]]; - ptag := px.mTag; - if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) and - // constant coord should be inside - ((hopt and (y >= px.y0) and (y <= px.y1)) or - ((not hopt) and (x >= px.x0) and (x <= px.x1))) then - begin - px.mQueryMark := lq; // mark as processed - // inside the proxy? - if (hopt and (x > px.x0) and (x < px.x1)) or - ((not hopt) and (y > px.y0) and (y < px.y1)) then - begin - // setup prev[xy] - if assigned(cb) then - begin - if cb(px.mObj, ptag, x, y, x, y) then - begin - result := px.mObj; - ex := x; - ey := y; - mInQuery := false; - exit; - end; - end - else - begin - distSq := distanceSq(ax0, ay0, x, y); - {$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]); - {$ENDIF} - if (distSq < lastDistSq) then - begin - wasHit := true; - lastDistSq := distSq; - ex := prevx; - ey := prevy; - lastObj := px.mObj; - end; - end; - end; + // bound c0 and c1 to cell + c0 := nclamp(px.y0-miny, celly0, celly1); + c1 := nclamp(px.y1-miny, celly0, celly1); + // fill the thing + {$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)]); + {$ENDIF} + //assert(c0 <= c1); + FillChar(filled[c0-celly0], c1-c0+1, 1); end; - // next cell - ccidx := cc.next; end; - if wasHit and not assigned(cb) then begin result := lastObj; mInQuery := false; exit; end; - if assigned(cb) and cb(nil, 0, x, y, x, y) then begin result := lastObj; mInQuery := false; exit; end; + // next cell + ccidx := cc.next; end; - // skip to next tile - if hopt then + {$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); + {$ENDIF} + // now go till we hit cell boundary or empty space + if (dy < 0) then begin - if (stx > 0) then - begin - // to the right - wkstep := ((xptr^ or (mTileSize-1))+1)-xptr^; - {$IF DEFINED(D2F_DEBUG)} - if dbgShowTraceLog then e_LogWritefln(' right step: wklen=%d; wkstep=%d', [wklen, wkstep]); - {$ENDIF} - if (wkstep >= wklen) then break; - Inc(xptr^, wkstep); - Inc(ga); - end - else + // up + while (y0 >= celly0) and (filled[y0-celly0] <> 0) do begin - // to the left - wkstep := xptr^-((xptr^ and (not (mTileSize-1)))-1); - {$IF DEFINED(D2F_DEBUG)} - if dbgShowTraceLog then e_LogWritefln(' left step: wklen=%d; wkstep=%d', [wklen, wkstep]); + {$IF DEFINED(D2F_DEBUG_OTR)} + e_LogWritefln(' filled: cdy=%s; y0=%s; celly0=%s; ay0=%s; ay1=%s', [y0-celly0, y0, celly0, ay0, ay1]); {$ENDIF} - if (wkstep >= wklen) then break; - Dec(xptr^, wkstep); - Dec(ga); + 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 - 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; + // 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; - 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 + else + begin + // horizontal + assert(false); end; - {$ENDIF} +end; - {$IF DEFINED(D2F_DEBUG_RAYTRACE)} - if assigned(dbgRayTraceTileHitCB) then dbgRayTraceTileHitCB((xptr^ div tsize*tsize)+minx, (yptr^ div tsize*tsize)+miny); - {$ENDIF} - //e_LogWritefln('*********************', []); - ccidx := -1; - // can omit checks - while (xd <> term) do +// ////////////////////////////////////////////////////////////////////////// // +function TBodyGridBase.traceRay (const x0, y0, x1, y1: Integer; cb: TGridQueryCB; tagmask: Integer=-1): ITP; +var + ex, ey: Integer; +begin + result := traceRay(ex, ey, x0, y0, x1, y1, cb, tagmask); +end; + + +// no callback: return `true` on the nearest hit +// you are not supposed to understand this +function TBodyGridBase.traceRay (out ex, ey: Integer; const ax0, ay0, ax1, ay1: Integer; cb: TGridQueryCB; tagmask: Integer=-1): ITP; +var + lw, sweepw: TLineWalker; + ccidx: Integer; + cc: PGridCell; + px: PBodyProxyRec; + lq: LongWord; + f, ptag: Integer; + gw, gh, minx, miny: Integer; + x0, y0: Integer; + x1, y1: Integer; + cx, cy: Integer; + px0, py0, px1, py1: Integer; + lastDistSq, distSq, hx, hy: Integer; + firstCell: Boolean = true; + wasHit: Boolean; +begin + result := Default(ITP); + tagmask := tagmask and TagFullMask; + if (tagmask = 0) then exit; + + gw := mWidth; + gh := mHeight; + minx := mMinX; + miny := mMinY; + + // make query coords (0,0)-based + x0 := ax0-minx; + y0 := ay0-miny; + x1 := ax1-minx; + y1 := ay1-miny; + + lw := TLineWalker.Create(0, 0, gw*mTileSize-1, gh*mTileSize-1); + if not lw.setup(x0, y0, x1, y1) then exit; // out of screen + + sweepw := TLineWalker.Create(0, 0, 1, 1); // doesn't matter, just shut ups the compiler + + lastDistSq := distanceSq(ax0, ay0, ax1, ay1)+1; + + if mInQuery then raise Exception.Create('recursive queries aren''t supported'); + mInQuery := true; + + // increase query counter + Inc(mLastQuery); + if (mLastQuery = 0) then begin - // check cell(s) - {$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 @@ -2445,14 +2299,19 @@ var 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 @@ -2464,23 +2323,35 @@ var // 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); + {$ENDIF} x0 := ax0; y0 := ay0; @@ -2577,7 +2448,8 @@ begin begin yd := wy0; e -= rem+dsx; - if (rem > 0) then begin Inc(xd); e += dy2; end; + //if (rem > 0) then begin Inc(xd); e += dy2; end; //BUGGY + if (xd < wx0) then begin xd += 1; e += dy2; end; //??? xfixed := true; end; end; @@ -2616,10 +2488,33 @@ begin // DON'T DO THIS! loop will take care of that if (xd = term) then begin - result := forEachAtPoint(ax0, ay0, cb, tagmask, @ptag); + //FIXME! + result := forEachAtPoint(ax0, ay0, nil, tagmask, @ptag); + if (result <> nil) then + begin + if assigned(cb) then + begin + if cb(result, ptag, ax0, ay0, ax0, ay0) then + begin + ex := ax0; + ey := ay0; + end + else + begin + result := nil; + end; + end + else + begin + ex := ax0; + ey := ay0; + end; + end; exit; end; + prevx := xptr^+minx; + prevy := yptr^+miny; (* // move coords if (e >= 0) then begin yd += sty; e -= dx2; end else e += dy2; @@ -2629,12 +2524,18 @@ begin *) {$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); + {$ENDIF} + + //if (dbgShowTraceLog) then e_WriteLog(Format('raycast start: (%d,%d)-(%d,%d); xptr^=%d; yptr^=%d', [ax0, ay0, ax1, ay1, xptr^, yptr^]), MSG_NOTIFY); + if mInQuery then raise Exception.Create('recursive queries aren''t supported'); mInQuery := true; @@ -2661,11 +2562,14 @@ begin {$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]); {$ENDIF} // new tile? if (ga <> lastGA) then @@ -2673,6 +2577,7 @@ begin lastGA := ga; ccidx := mGrid[lastGA]; // convert coords to map (to avoid ajdusting coords inside the loop) + if hopt then x := xptr^+minx else y := yptr^+miny; while (ccidx <> -1) do begin cc := @mCells[ccidx]; @@ -2681,24 +2586,120 @@ begin if (cc.bodies[f] = -1) then break; px := @mProxies[cc.bodies[f]]; ptag := px.mTag; - if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) then + if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) and + // constant coord should be inside + ((hopt and (y >= px.y0) and (y <= px.y1)) or + ((not hopt) and (x >= px.x0) and (x <= px.x1))) then begin px.mQueryMark := lq; // mark as processed + // inside the proxy? + if (hopt and (x > px.x0) and (x < px.x1)) or + ((not hopt) and (y > px.y0) and (y < px.y1)) then + begin + // setup prev[xy] + if assigned(cb) then + begin + if cb(px.mObj, ptag, x, y, x, y) then + begin + result := px.mObj; + ex := x; + ey := y; + mInQuery := false; + exit; + end; + end + else + begin + distSq := distanceSq(ax0, ay0, x, y); + {$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]); + {$ENDIF} + if (distSq < lastDistSq) then + begin + wasHit := true; + lastDistSq := distSq; + ex := prevx; + ey := prevy; + lastObj := px.mObj; + end; end; end; end; // next cell ccidx := cc.next; end; + if wasHit and not assigned(cb) then begin result := lastObj; mInQuery := false; exit; end; + if assigned(cb) and cb(nil, 0, x, y, x, y) then begin result := lastObj; mInQuery := false; exit; end; end; // skip to next tile if hopt then @@ -2753,25 +2754,28 @@ begin end; Dec(wklen, wkstep); end; + // we can travel less than one cell + if wasHit and not assigned(cb) then result := lastObj else begin ex := ax1; ey := ay1; end; mInQuery := false; exit; end; {$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} @@ -2779,437 +2783,138 @@ begin 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;