diff --git a/src/game/g_grid.pas b/src/game/g_grid.pas
index d56a24365ec397c8c071b1bfa7f648709e8ae473..e45fede6f34b818d9a9f41191fc0d0c8bef8e32b 100644 (file)
--- a/src/game/g_grid.pas
+++ b/src/game/g_grid.pas
*)
// universal spatial grid
{$INCLUDE ../shared/a_modes.inc}
-{$DEFINE grid_use_buckets}
unit g_grid;
interface
type TGridQueryCB = function (obj: ITP; tag: Integer): Boolean is nested; // return `true` to stop
type TGridRayQueryCB = function (obj: ITP; tag: Integer; x, y, prevx, prevy: Integer): Boolean is nested; // return `true` to stop
+ const TagDisabled = $40000000;
+ const TagFullMask = $3fffffff;
+
private
const
GridDefaultTileSize = 32;
- {$IFDEF grid_use_buckets}
GridCellBucketSize = 8; // WARNING! can't be less than 2!
- {$ENDIF}
private
type
mX, mY, mWidth, mHeight: Integer; // aabb
mQueryMark: LongWord; // was this object visited at this query?
mObj: ITP;
- mTag: Integer;
+ mTag: Integer; // `TagDisabled` set: disabled ;-)
nextLink: TBodyProxyId; // next free or nothing
private
PGridCell = ^TGridCell;
TGridCell = record
- {$IFDEF grid_use_buckets}
bodies: array [0..GridCellBucketSize-1] of Integer; // -1: end of list
- {$ELSE}
- body: Integer;
- {$ENDIF}
next: Integer; // in this cell; index in mCells
end;
- TGridInternalCB = function (grida: Integer): Boolean of object; // return `true` to stop
+ TGridInternalCB = function (grida: Integer; bodyId: TBodyProxyId): Boolean of object; // return `true` to stop
+
+ private
+ //mTileSize: Integer;
+ const mTileSize = GridDefaultTileSize;
private
- mTileSize: Integer;
mMinX, mMinY: Integer; // so grids can start at any origin
mWidth, mHeight: Integer; // in tiles
mGrid: array of Integer; // mWidth*mHeight, index in mCells
mProxyCount: Integer; // currently used
mProxyMaxCount: Integer;
- mUData: TBodyProxyId; // for inserter/remover
- mTagMask: Integer; // for iterator
- mItCB: TGridQueryCB; // for iterator
-
private
function allocCell: Integer;
procedure freeCell (idx: Integer); // `next` is simply overwritten
function allocProxy (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer): TBodyProxyId;
procedure freeProxy (body: TBodyProxyId);
- procedure insert (body: TBodyProxyId);
- procedure remove (body: TBodyProxyId);
+ procedure insertInternal (body: TBodyProxyId);
+ procedure removeInternal (body: TBodyProxyId);
- function forGridRect (x, y, w, h: Integer; cb: TGridInternalCB): Boolean;
+ function forGridRect (x, y, w, h: Integer; cb: TGridInternalCB; bodyId: TBodyProxyId): Boolean;
- function inserter (grida: Integer): Boolean;
- function remover (grida: Integer): Boolean;
+ function inserter (grida: Integer; bodyId: TBodyProxyId): Boolean;
+ function remover (grida: Integer; bodyId: TBodyProxyId): Boolean;
+
+ function getProxyEnabled (pid: TBodyProxyId): Boolean; inline;
+ procedure setProxyEnabled (pid: TBodyProxyId; val: Boolean); inline;
public
- constructor Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
+ constructor Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer{; aTileSize: Integer=GridDefaultTileSize});
destructor Destroy (); override;
- function insertBody (aObj: ITP; ax, ay, aWidth, aHeight: Integer; aTag: Integer=0): TBodyProxyId;
+ function insertBody (aObj: ITP; ax, ay, aWidth, aHeight: Integer; aTag: Integer=-1): TBodyProxyId;
procedure removeBody (aObj: TBodyProxyId); // WARNING! this WILL destroy proxy!
procedure moveBody (body: TBodyProxyId; dx, dy: Integer);
procedure resizeBody (body: TBodyProxyId; sx, sy: Integer);
procedure moveResizeBody (body: TBodyProxyId; dx, dy, sx, sy: Integer);
- //WARNING: can't do recursive queries
- function forEachInAABB (x, y, w, h: Integer; cb: TGridQueryCB; tagmask: Integer=-1): Boolean;
+ function insideGrid (x, y: Integer): Boolean; inline;
+
+ //WARNING: don't modify grid while any query is in progress (no checks are made!)
+ // you can set enabled/disabled flag, tho (but iterator can still return objects disabled inside it)
+ // no callback: return `true` on the first hit
+ function forEachInAABB (x, y, w, h: Integer; cb: TGridQueryCB; tagmask: Integer=-1; allowDisabled: Boolean=false): ITP;
- //WARNING: can't do recursive queries
- function forEachAtPoint (x, y: Integer; cb: TGridQueryCB; tagmask: Integer=-1): Boolean;
+ //WARNING: don't modify grid while any query is in progress (no checks are made!)
+ // you can set enabled/disabled flag, tho (but iterator can still return objects disabled inside it)
+ // no callback: return `true` on the first hit
+ function forEachAtPoint (x, y: Integer; cb: TGridQueryCB; tagmask: Integer=-1): ITP;
- //WARNING: can't do recursive queries
+ //WARNING: don't modify grid while any query is in progress (no checks are made!)
+ // you can set enabled/disabled flag, tho (but iterator can still return objects disabled inside it)
// cb with `(nil)` will be called before processing new tile
- function traceRay (x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): Boolean; overload;
+ // no callback: return `true` on the nearest hit
+ function traceRay (x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP; overload;
+ function traceRay (out ex, ey: Integer; x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP;
procedure dumpStats ();
+
+ //WARNING! no sanity checks!
+ property proxyEnabled[pid: TBodyProxyId]: Boolean read getProxyEnabled write setProxyEnabled;
end;
// ////////////////////////////////////////////////////////////////////////// //
-constructor TBodyGridBase.Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
+constructor TBodyGridBase.Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer{; aTileSize: Integer=GridDefaultTileSize});
var
idx: Integer;
begin
+ {
if aTileSize < 1 then aTileSize := 1;
if aTileSize > 8192 then aTileSize := 8192; // arbitrary limit
- if aPixWidth < aTileSize then aPixWidth := aTileSize;
- if aPixHeight < aTileSize then aPixHeight := aTileSize;
mTileSize := aTileSize;
+ }
+ if (aPixWidth < mTileSize) then aPixWidth := mTileSize;
+ if (aPixHeight < mTileSize) then aPixHeight := mTileSize;
mMinX := aMinPixX;
mMinY := aMinPixY;
- mWidth := (aPixWidth+aTileSize-1) div aTileSize;
- mHeight := (aPixHeight+aTileSize-1) div aTileSize;
+ mWidth := (aPixWidth+mTileSize-1) div mTileSize;
+ mHeight := (aPixHeight+mTileSize-1) div mTileSize;
SetLength(mGrid, mWidth*mHeight);
SetLength(mCells, mWidth*mHeight);
SetLength(mProxies, 8192);
// init free list
for idx := 0 to High(mCells) do
begin
- {$IFDEF grid_use_buckets}
mCells[idx].bodies[0] := -1;
- {$ELSE}
- mCells[idx].body := -1;
- {$ENDIF}
mCells[idx].next := idx+1;
end;
mCells[High(mCells)].next := -1; // last cell
mProxyFree := 0;
mProxyCount := 0;
mProxyMaxCount := 0;
- mUData := 0;
- mTagMask := -1;
- mItCB := nil;
e_WriteLog(Format('created grid with size: %dx%d (tile size: %d); pix: %dx%d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize]), MSG_NOTIFY);
end;
end;
+function TBodyGridBase.insideGrid (x, y: Integer): Boolean; inline;
+begin
+ // fix coords
+ Dec(x, mMinX);
+ Dec(y, mMinY);
+ result := (x >= 0) and (y >= 0) and (x < mWidth*mTileSize) and (y < mHeight*mTileSize);
+end;
+
+
+function TBodyGridBase.getProxyEnabled (pid: TBodyProxyId): Boolean; inline;
+begin
+ if (pid >= 0) then result := ((mProxies[pid].mTag and TagDisabled) = 0) else result := false;
+end;
+
+
+procedure TBodyGridBase.setProxyEnabled (pid: TBodyProxyId; val: Boolean); inline;
+begin
+ if (pid >= 0) then
+ begin
+ if val then
+ begin
+ mProxies[pid].mTag := mProxies[pid].mTag and not TagDisabled;
+ end
+ else
+ begin
+ mProxies[pid].mTag := mProxies[pid].mTag or TagDisabled;
+ end;
+ end;
+end;
+
+
function TBodyGridBase.allocCell: Integer;
var
idx: Integer;
SetLength(mCells, mFreeCell+32768); // arbitrary number
for idx := mFreeCell to High(mCells) do
begin
- {$IFDEF grid_use_buckets}
mCells[idx].bodies[0] := -1;
- {$ELSE}
- mCells[idx].body := -1;
- {$ENDIF}
mCells[idx].next := idx+1;
end;
mCells[High(mCells)].next := -1; // last cell
result := mFreeCell;
mFreeCell := mCells[result].next;
mCells[result].next := -1;
- {$IFDEF grid_use_buckets}
mCells[result].bodies[0] := -1;
- {$ELSE}
- mCells[result].body := -1;
- {$ENDIF}
Inc(mUsedCells);
//e_WriteLog(Format('grid: allocated new cell #%d (total: %d)', [result, mUsedCells]), MSG_NOTIFY);
end;
if (idx >= 0) and (idx < Length(mCells)) then
begin
//if mCells[idx].body = -1 then exit; // the thing that should not be
- {$IFDEF grid_use_buckets}
mCells[idx].bodies[0] := -1;
- {$ELSE}
- mCells[idx].body := -1;
- {$ENDIF}
mCells[idx].next := mFreeCell;
mFreeCell := idx;
Dec(mUsedCells);
end;
-function TBodyGridBase.forGridRect (x, y, w, h: Integer; cb: TGridInternalCB): Boolean;
+function TBodyGridBase.forGridRect (x, y, w, h: Integer; cb: TGridInternalCB; bodyId: TBodyProxyId): Boolean;
+const
+ tsize = mTileSize;
var
gx, gy: Integer;
- gw, gh, tsize: Integer;
+ gw, gh: Integer;
begin
result := false;
if (w < 1) or (h < 1) or not assigned(cb) then exit;
if (x+w <= 0) or (y+h <= 0) then exit;
gw := mWidth;
gh := mHeight;
- tsize := mTileSize;
+ //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
begin
if (gx < 0) then continue;
if (gx >= gw) then break;
- result := cb(gy*gw+gx);
+ result := cb(gy*gw+gx, bodyId);
if result then exit;
end;
end;
end;
-function TBodyGridBase.inserter (grida: Integer): Boolean;
+function TBodyGridBase.inserter (grida: Integer; bodyId: TBodyProxyId): Boolean;
var
cidx: Integer;
pc: Integer;
- {$IFDEF grid_use_buckets}
pi: PGridCell;
f: Integer;
- {$ENDIF}
begin
result := false; // never stop
// add body to the given grid cell
pc := mGrid[grida];
- {$IFDEF grid_use_buckets}
if (pc <> -1) then
begin
pi := @mCells[pc];
if (pi.bodies[f] = -1) then
begin
// can add here
- pi.bodies[f] := mUData;
+ pi.bodies[f] := bodyId;
if (f+1 < Length(TGridCell.bodies)) then pi.bodies[f+1] := -1;
exit;
end;
end;
// either no room, or no cell at all
cidx := allocCell();
- mCells[cidx].bodies[0] := mUData;
+ mCells[cidx].bodies[0] := bodyId;
mCells[cidx].bodies[1] := -1;
mCells[cidx].next := pc;
mGrid[grida] := cidx;
- {$ELSE}
- cidx := allocCell();
- //e_WriteLog(Format(' 01: allocated cell for grid coords (%d,%d), body coords:(%d,%d): #%d', [gx, gy, dx, dy, cidx]), MSG_NOTIFY);
- mCells[cidx].body := mUData;
- mCells[cidx].next := pc;
- mGrid[grida] := cidx;
- {$ENDIF}
end;
-
-procedure TBodyGridBase.insert (body: TBodyProxyId);
+procedure TBodyGridBase.insertInternal (body: TBodyProxyId);
var
px: PBodyProxyRec;
begin
if (body < 0) or (body > High(mProxies)) then exit; // just in case
px := @mProxies[body];
- mUData := body;
- forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, inserter);
+ forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, inserter, body);
end;
-function TBodyGridBase.remover (grida: Integer): Boolean;
+// absolutely not tested
+function TBodyGridBase.remover (grida: Integer; bodyId: TBodyProxyId): Boolean;
var
- {$IFDEF grid_use_buckets}
f: Integer;
- {$ENDIF}
pidx, idx, tmp: Integer;
- {$IFDEF grid_use_buckets}
pc: PGridCell;
- {$ENDIF}
begin
result := false; // never stop
// find and remove cell
while (idx >= 0) do
begin
tmp := mCells[idx].next;
- {$IFDEF grid_use_buckets}
pc := @mCells[idx];
f := 0;
while (f < High(TGridCell.bodies)) do
begin
- if (pc.bodies[f] = mUData) then
+ if (pc.bodies[f] = bodyId) then
begin
// i found her!
if (f = 0) and (pc.bodies[1] = -1) then
end;
Inc(f);
end;
- {$ELSE}
- if (mCells[idx].body = mUData) then
- begin
- if (pidx = -1) then mGrid[grida] := tmp else mCells[pidx].next := tmp;
- freeCell(idx);
- exit; // assume that we cannot have one object added to bucket twice
- end;
- {$ENDIF}
pidx := idx;
idx := tmp;
end;
end;
-
// absolutely not tested
-procedure TBodyGridBase.remove (body: TBodyProxyId);
+procedure TBodyGridBase.removeInternal (body: TBodyProxyId);
var
px: PBodyProxyRec;
begin
if (body < 0) or (body > High(mProxies)) then exit; // just in case
px := @mProxies[body];
- mUData := body;
- forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover);
+ forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover, body);
end;
-function TBodyGridBase.insertBody (aObj: ITP; aX, aY, aWidth, aHeight: Integer; aTag: Integer=0): TBodyProxyId;
+function TBodyGridBase.insertBody (aObj: ITP; aX, aY, aWidth, aHeight: Integer; aTag: Integer=-1): TBodyProxyId;
begin
+ aTag := aTag and TagFullMask;
result := allocProxy(aX, aY, aWidth, aHeight, aObj, aTag);
- insert(result);
+ insertInternal(result);
end;
procedure TBodyGridBase.removeBody (aObj: TBodyProxyId);
begin
if (aObj < 0) or (aObj > High(mProxies)) then exit; // just in case
- remove(aObj);
+ removeInternal(aObj);
freeProxy(aObj);
end;
begin
if (body < 0) or (body > High(mProxies)) then exit; // just in case
if ((dx = 0) and (dy = 0) and (sx = 0) and (sy = 0)) then exit;
- remove(body);
+ removeInternal(body);
px := @mProxies[body];
Inc(px.mX, dx);
Inc(px.mY, dy);
Inc(px.mWidth, sx);
Inc(px.mHeight, sy);
- insert(body);
+ insertInternal(body);
end;
procedure TBodyGridBase.moveBody (body: TBodyProxyId; dx, dy: Integer);
// ////////////////////////////////////////////////////////////////////////// //
-function TBodyGridBase.forEachAtPoint (x, y: Integer; cb: TGridQueryCB; tagmask: Integer=-1): Boolean;
+// no callback: return `true` on the first hit
+function TBodyGridBase.forEachAtPoint (x, y: Integer; cb: TGridQueryCB; tagmask: Integer=-1): ITP;
var
- {$IFDEF grid_use_buckets}
f: Integer;
- {$ENDIF}
idx, curci: Integer;
cc: PGridCell = nil;
px: PBodyProxyRec;
lq: LongWord;
+ ptag: Integer;
begin
- result := false;
- if not assigned(cb) or (tagmask = 0) then exit;
+ result := Default(ITP);
+ tagmask := tagmask and TagFullMask;
+ if (tagmask = 0) then exit;
// make coords (0,0)-based
Dec(x, mMinX);
while (curci <> -1) do
begin
cc := @mCells[curci];
- {$IFDEF grid_use_buckets}
for f := 0 to High(TGridCell.bodies) do
begin
if (cc.bodies[f] = -1) then break;
px := @mProxies[cc.bodies[f]];
- if (px.mQueryMark <> lq) and ((px.mTag and tagmask) <> 0) then
+ ptag := px.mTag;
+ if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) then
begin
if (x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight) then
begin
px.mQueryMark := lq;
- result := cb(px.mObj, px.mTag);
- if result then exit;
- end;
- end;
- end;
- {$ELSE}
- if (cc.body <> -1) then
- begin
- px := @mProxies[cc.body];
- if (px.mQueryMark <> lq) and ((px.mTag and tagmask) <> 0) then
- begin
- if (x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight) then
- begin
- px.mQueryMark := lq;
- result := cb(px.mObj, px.mTag);
- if result then exit;
+ if assigned(cb) then
+ begin
+ if cb(px.mObj, ptag) then begin result := px.mObj; exit; end;
+ end
+ else
+ begin
+ result := px.mObj;
+ exit;
+ end;
end;
end;
end;
- {$ENDIF}
curci := cc.next;
end;
end;
-function TBodyGridBase.forEachInAABB (x, y, w, h: Integer; cb: TGridQueryCB; tagmask: Integer=-1): Boolean;
+// no callback: return `true` on the first hit
+function TBodyGridBase.forEachInAABB (x, y, w, h: Integer; cb: TGridQueryCB; tagmask: Integer=-1; allowDisabled: Boolean=false): ITP;
+const
+ tsize = mTileSize;
var
idx: Integer;
gx, gy: Integer;
curci: Integer;
- {$IFDEF grid_use_buckets}
f: Integer;
- {$ENDIF}
cc: PGridCell = nil;
px: PBodyProxyRec;
lq: LongWord;
- tsize, gw: Integer;
+ gw: Integer;
x0, y0: Integer;
+ ptag: Integer;
begin
- result := false;
- if (w < 1) or (h < 1) or not assigned(cb) then exit;
+ result := Default(ITP);
+ if (w < 1) or (h < 1) then exit;
+ tagmask := tagmask and TagFullMask;
+ if (tagmask = 0) then exit;
x0 := x;
y0 := y;
Dec(y, mMinY);
gw := mWidth;
- tsize := mTileSize;
+ //tsize := mTileSize;
if (x+w <= 0) or (y+h <= 0) then exit;
if (x >= gw*tsize) or (y >= mHeight*tsize) then exit;
while (curci <> -1) do
begin
cc := @mCells[curci];
- {$IFDEF grid_use_buckets}
for f := 0 to High(TGridCell.bodies) do
begin
if (cc.bodies[f] = -1) then break;
px := @mProxies[cc.bodies[f]];
- if (px.mQueryMark <> lq) and ((px.mTag and tagmask) <> 0) then
+ ptag := px.mTag;
+ if (not allowDisabled) and ((ptag and TagDisabled) <> 0) then continue;
+ if ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) then
+ //if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) then
+ //if ( ((ptag and TagDisabled) = 0) = ignoreDisabled) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) then
begin
if (x0 >= px.mX+px.mWidth) or (y0 >= px.mY+px.mHeight) then continue;
if (x0+w <= px.mX) or (y0+h <= px.mY) then continue;
px.mQueryMark := lq;
- result := cb(px.mObj, px.mTag);
- if result then exit;
- end;
- end;
- {$ELSE}
- if (cc.body <> 1) then
- begin
- px := @mProxies[cc.body];
- if (px.mQueryMark <> lq) and ((px.mTag and tagmask) <> 0) then
- begin
- if (x0 >= px.mX+px.mWidth) or (y0 >= px.mY+px.mHeight) or (x0+w <= px.mX) or (y0+h <= px.mY) then
+ if assigned(cb) then
begin
- // no intersection
+ if cb(px.mObj, ptag) then begin result := px.mObj; exit; end;
end
else
begin
- px.mQueryMark := lq;
- result := cb(px.mObj, px.mTag);
- if result then exit;
+ result := px.mObj;
+ exit;
end;
end;
end;
- {$ENDIF}
curci := cc.next;
end;
end;
// ////////////////////////////////////////////////////////////////////////// //
-function TBodyGridBase.traceRay (x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): Boolean;
+// no callback: return `true` on the nearest hit
+function TBodyGridBase.traceRay (x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP;
+var
+ ex, ey: Integer;
+begin
+ result := traceRay(ex, ey, x0, y0, x1, y1, cb, tagmask);
+end;
+
+
+// no callback: return `true` on the nearest hit
+function TBodyGridBase.traceRay (out ex, ey: Integer; x0, y0, x1, y1: Integer; cb: TGridRayQueryCB; tagmask: Integer=-1): ITP;
+const
+ tsize = mTileSize;
var
i: Integer;
- dx, dy: Integer;
- xerr: Integer = 0;
- yerr: Integer = 0;
- d: Integer;
+ dx, dy, d: Integer;
+ xerr, yerr: Integer;
incx, incy: Integer;
+ stepx, stepy: Integer;
x, y: Integer;
maxx, maxy: Integer;
- tsize: Integer; // tile size
gw, gh: Integer;
- lastGA: Integer = -1;
- ga: Integer = -1; // last used grid address
- ccidx: Integer = -1;
- curci: Integer = -1;
- cc: PGridCell = nil;
+ ccidx: Integer;
+ curci: Integer;
+ cc: PGridCell;
hasUntried: Boolean;
- f: Integer;
px: PBodyProxyRec;
lq: LongWord;
prevX, prevY: Integer;
minx, miny: Integer;
+ ptag: Integer;
+ lastDistSq, distSq: Integer;
+ wasHit: Boolean = false;
+ lastObj: ITP;
+ lastWasInGrid: Boolean;
+ tbcross: Boolean;
+ f: Integer;
begin
- result := false;
+ result := Default(ITP);
+ lastObj := Default(ITP);
+ tagmask := tagmask and TagFullMask;
+ if (tagmask = 0) then begin ex := x0; ey := y0; exit; end;
- if (tagmask = 0) then exit;
-
- // make coords (0,0)-based
minx := mMinX;
miny := mMinY;
- Dec(x0, minx);
- Dec(y0, miny);
- Dec(x1, minx);
- Dec(y1, miny);
dx := x1-x0;
dy := y1-y0;
if (dx > dy) then d := dx else d := dy;
- x := x0;
- y := y0;
+ // `x` and `y` will be in grid coords
+ x := x0-minx;
+ y := y0-miny;
// increase query counter
Inc(mLastQuery);
end;
lq := mLastQuery;
- tsize := mTileSize;
+ // cache various things
+ //tsize := mTileSize;
gw := mWidth;
gh := mHeight;
maxx := gw*tsize-1;
maxy := gh*tsize-1;
+ // setup distance and flags
+ lastDistSq := (x1-x0)*(x1-x0)+(y1-y0)*(y1-y0)+1;
+ lastWasInGrid := (x >= 0) and (y >= 0) and (x <= maxx) and (y <= maxy);
+
+ // setup starting tile ('cause we'll adjust tile vars only on tile edge crossing)
+ if lastWasInGrid then ccidx := mGrid[(y div tsize)*gw+(x div tsize)] else ccidx := -1;
+
+ // it is slightly faster this way
+ xerr := -d;
+ yerr := -d;
+
+ // now trace
for i := 1 to d do
begin
+ // prevs are always in map coords
prevX := x+minx;
prevY := y+miny;
- Inc(xerr, dx); if (xerr >= d) then begin Dec(xerr, d); Inc(x, incx); end;
- Inc(yerr, dy); if (yerr >= d) then begin Dec(yerr, d); Inc(y, incy); end;
-
- if (x >= 0) and (y >= 0) and (x <= maxx) and (y <= maxy) then
+ // do one step
+ xerr += dx;
+ yerr += dy;
+ // invariant: one of those always changed
+ if (xerr < 0) and (yerr < 0) then raise Exception.Create('internal bug in grid raycaster (0)');
+ if (xerr >= 0) then begin xerr -= d; x += incx; stepx := incx; end else stepx := 0;
+ if (yerr >= 0) then begin yerr -= d; y += incy; stepy := incy; end else stepy := 0;
+ // invariant: we always doing a step
+ if ((stepx or stepy) = 0) then raise Exception.Create('internal bug in grid raycaster (1)');
begin
- ga := (y div tsize)*gw+(x div tsize);
- if (lastGA <> ga) then
+ // check for crossing tile/grid boundary
+ if (x >= 0) and (y >= 0) and (x <= maxx) and (y <= maxy) then
begin
- // new cell
- lastGA := ga;
- ccidx := mGrid[lastGA];
- {
- if (ccidx <> -1) then
+ // we're still in grid
+ lastWasInGrid := true;
+ // check for tile edge crossing
+ if (stepx < 0) and ((x mod tsize) = tsize-1) then tbcross := true
+ else if (stepx > 0) and ((x mod tsize) = 0) then tbcross := true
+ else if (stepy < 0) and ((y mod tsize) = tsize-1) then tbcross := true
+ else if (stepy > 0) and ((y mod tsize) = 0) then tbcross := true
+ else tbcross := false;
+ // crossed tile edge?
+ if tbcross then
begin
- result := cb(nil, 0, x+minx, y+miny, prevX, prevY);
- if result then exit;
+ // had something in the cell we're leaving?
+ if (ccidx <> -1) then
+ begin
+ // yes, signal cell completion
+ if assigned(cb) then
+ begin
+ if cb(nil, 0, x+minx, y+miny, prevX, prevY) then begin result := lastObj; exit; end;
+ end
+ else if wasHit then
+ begin
+ result := lastObj;
+ exit;
+ end;
+ end;
+ // setup new cell index
+ ccidx := mGrid[(y div tsize)*gw+(x div tsize)];
end;
- }
- end;
- end
- else
- begin
- if (ccidx <> -1) then
+ end
+ else
begin
- ccidx := -1;
- result := cb(nil, 0, x+minx, y+miny, prevX, prevY);
- if result then exit;
+ // out of grid, had something in the last processed cell?
+ if (ccidx <> -1) then
+ begin
+ // yes, signal cell completion
+ ccidx := -1;
+ if assigned(cb) then
+ begin
+ if cb(nil, 0, x+minx, y+miny, prevX, prevY) then begin result := lastObj; exit; end;
+ end
+ else if wasHit then
+ begin
+ result := lastObj;
+ exit;
+ end;
+ end;
+ if lastWasInGrid then exit; // oops, stepped out of the grid -- there is no way to return
end;
end;
+ // has something to process in the current cell?
if (ccidx <> -1) then
begin
+ // process cell
curci := ccidx;
- hasUntried := false;
+ hasUntried := false; // this will be set to `true` if we have some proxies we still want to process at the next step
+ // convert coords to map (to avoid ajdusting coords inside the loop)
Inc(x, minx);
Inc(y, miny);
+ // process cell list
while (curci <> -1) do
begin
cc := @mCells[curci];
- {$IFDEF grid_use_buckets}
for f := 0 to High(TGridCell.bodies) do
begin
if (cc.bodies[f] = -1) then break;
px := @mProxies[cc.bodies[f]];
- if (px.mQueryMark <> lq) and ((px.mTag and tagmask) <> 0) then
+ ptag := px.mTag;
+ if ((ptag and TagDisabled) = 0) and ((ptag and tagmask) <> 0) and (px.mQueryMark <> lq) then
begin
+ // can we process this proxy?
if (x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight) then
begin
- px.mQueryMark := lq;
- result := cb(px.mObj, px.mTag, x, y, prevX, prevY);
- if result then exit;
+ px.mQueryMark := lq; // mark as processed
+ if assigned(cb) then
+ begin
+ if cb(px.mObj, ptag, x, y, prevX, prevY) then
+ begin
+ result := lastObj;
+ ex := prevX;
+ ey := prevY;
+ exit;
+ end;
+ end
+ else
+ begin
+ // remember this hitpoint if it is nearer than an old one
+ distSq := (prevX-x0)*(prevX-x0)+(prevY-y0)*(prevY-y0);
+ if (distSq < lastDistSq) then
+ begin
+ wasHit := true;
+ lastDistSq := distSq;
+ ex := prevX;
+ ey := prevY;
+ lastObj := px.mObj;
+ end;
+ end;
end
else
begin
+ // this is possibly interesting proxy, set "has more to check" flag
hasUntried := true;
end;
end;
end;
- {$ELSE}
- if (cc.body <> -1) then
- begin
- px := @mProxies[cc.body];
- if (px.mQueryMark <> lq) and ((px.mTag and tagmask) <> 0) then
- begin
- if (x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight) then
- begin
- px.mQueryMark := lq;
- result := cb(px.mObj, px.mTag, x, y, prevX, prevY);
- if result then exit;
- end
- else
- begin
- hasUntried := true;
- end;
- end;
- end;
- {$ENDIF}
+ // next cell
curci := cc.next;
end;
+ // still has something interesting in this cell?
if not hasUntried then
begin
- // don't process this cell anymore
+ // nope, don't process this cell anymore; signal cell completion
ccidx := -1;
- result := cb(nil, 0, x, y, prevX, prevY);
- if result then exit;
+ if assigned(cb) then
+ begin
+ if cb(nil, 0, x, y, prevX, prevY) then begin result := lastObj; exit; end;
+ end
+ else if wasHit then
+ begin
+ result := lastObj;
+ exit;
+ end;
end;
+ // convert coords to grid
Dec(x, minx);
Dec(y, miny);
end;