diff --git a/src/game/g_grid.pas b/src/game/g_grid.pas
index 900a3661d90c49ccec2363d6e9e6814b71164b75..ffa05200c4d91b6957a186a6142ab6abe5d0ab1e 100644 (file)
--- a/src/game/g_grid.pas
+++ b/src/game/g_grid.pas
next: Integer; // in this cell; index in mCells
end;
+ GridInternalCB = function (grida: Integer): Boolean is nested; // return `true` to stop
+
TBodyGrid = class(TObject)
private
mTileSize: Integer;
procedure insert (body: TBodyProxy);
procedure remove (body: TBodyProxy);
+ function forGridRect (x, y, w, h: Integer; cb: GridInternalCB): Boolean;
+
public
constructor Create (aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
destructor Destroy (); override;
end;
-procedure TBodyGrid.insert (body: TBodyProxy);
+function TBodyGrid.forGridRect (x, y, w, h: Integer; cb: GridInternalCB): Boolean;
var
- dx, dy, gx, gy, cidx: Integer;
+ gx, gy: Integer;
begin
- if body = nil then exit;
- if (body.mWidth < 1) or (body.mHeight < 1) then exit;
- // out of grid?
- if (body.mX+body.mWidth <= 0) or (body.mY+body.mHeight <= 0) then exit;
- if (body.mX >= mWidth*mTileSize) or (body.mY >= mHeight*mTileSize) then exit;
- //e_WriteLog(Format('grid: inserting body: (%d,%d)-(%dx%d)', [body.mX, body.mY, body.mWidth, body.mHeight]), MSG_NOTIFY);
- gy := body.mY div mTileSize;
- dy := 0;
- while (dy < body.mHeight) do
+ result := false;
+ if (w < 1) or (h < 1) or not assigned(cb) then exit;
+ if (x+w <= 0) or (y+h <= 0) then exit;
+ if (x >= mWidth*mTileSize) or (y >= mHeight*mTileSize) then exit;
+ for gy := y div mTileSize to (y+h-1) div mTileSize do
begin
- if (gy >= 0) and (gy < mHeight) then
+ if (gy < 0) then continue;
+ if (gy >= mHeight) then break;
+ for gx := x div mTileSize to (x+w-1) div mTileSize do
begin
- dx := 0;
- gx := body.mX div mTileSize;
- while (dx < body.mWidth) do
- begin
- if (gx >= 0) and (gx < mWidth) then
- begin
- //e_WriteLog(Format(' 00: allocating cell for grid coords (%d,%d), body coords:(%d,%d)', [gx, gy, dx, dy]), MSG_NOTIFY);
- cidx := allocCell();
- //e_WriteLog(Format(' 01: allocated cell for grid coords (%d,%d), body coords:(%d,%d): #%d', [gx, gy, dx, dy, cidx]), MSG_NOTIFY);
- mCells[cidx].body := body;
- mCells[cidx].next := mGrid[gy*mWidth+gx];
- mGrid[gy*mWidth+gx] := cidx;
- //e_WriteLog(Format(' 02: put cell for grid coords (%d,%d), body coords:(%d,%d): #%d', [gx, gy, dx, dy, cidx]), MSG_NOTIFY);
- end;
- Inc(dx, mTileSize);
- Inc(gx);
- end;
+ if (gx < 0) then continue;
+ if (gx >= mWidth) then break;
+ if (cb(gy*mWidth+gx)) then begin result := true; exit; end;
end;
- Inc(dy, mTileSize);
- Inc(gy);
end;
end;
-// absolutely not tested
-procedure TBodyGrid.remove (body: TBodyProxy);
-var
- dx, dy, gx, gy, idx, pidx, tmp: Integer;
+procedure TBodyGrid.insert (body: TBodyProxy);
+
+ function inserter (grida: Integer): Boolean;
+ var
+ cidx: Integer;
+ begin
+ result := false; // never stop
+ // add body to the given grid cell
+ cidx := allocCell();
+ //e_WriteLog(Format(' 01: allocated cell for grid coords (%d,%d), body coords:(%d,%d): #%d', [gx, gy, dx, dy, cidx]), MSG_NOTIFY);
+ mCells[cidx].body := body;
+ mCells[cidx].next := mGrid[grida];
+ mGrid[grida] := cidx;
+ end;
+
begin
if body = nil then exit;
- if (body.mWidth < 1) or (body.mHeight < 1) then exit;
- // out of grid?
- if (body.mX+body.mWidth <= 0) or (body.mY+body.mHeight <= 0) then exit;
- if (body.mX >= mWidth*mTileSize) or (body.mY >= mHeight*mTileSize) then exit;
- gy := body.mY div mTileSize;
- dy := 0;
- pidx := -1;
- while (dy < body.mHeight) do
+ forGridRect(body.mX, body.mY, body.mWidth, body.mHeight, inserter);
+end;
+
+
+// absolutely not tested
+procedure TBodyGrid.remove (body: TBodyProxy);
+
+ function remover (grida: Integer): Boolean;
+ var
+ pidx, idx, tmp: Integer;
begin
- if (gy >= 0) and (gy < mHeight) then
+ result := false; // never stop
+ // find and remove cell
+ pidx := -1;
+ idx := mGrid[grida];
+ while idx >= 0 do
begin
- dx := 0;
- gx := body.mX div mTileSize;
- while (dx < body.mWidth) do
+ tmp := mCells[idx].next;
+ if (mCells[idx].body = body) then
+ begin
+ if (pidx = -1) then mGrid[grida] := tmp else mCells[pidx].next := tmp;
+ freeCell(idx);
+ break; // assume that we cannot have one object added to bucket twice
+ end
+ else
begin
- if (gx >= 0) and (gx < mWidth) then
- begin
- // find and remove cell
- pidx := -1;
- idx := mGrid[gy*mWidth+gx];
- while idx >= 0 do
- begin
- tmp := mCells[idx].next;
- if mCells[idx].body = body then
- begin
- if pidx = -1 then mGrid[gy*mWidth+gx] := tmp else mCells[pidx].next := tmp;
- freeCell(idx);
- end
- else
- begin
- pidx := idx;
- end;
- idx := tmp;
- end;
- end;
- Inc(dx, mTileSize);
- Inc(gx);
+ pidx := idx;
end;
+ idx := tmp;
end;
- Inc(dy, mTileSize);
- Inc(gy);
end;
+
+begin
+ if body = nil then exit;
+ forGridRect(body.mX, body.mY, body.mWidth, body.mHeight, remover);
end;
function TBodyGrid.forEachInAABB (x, y, w, h: Integer; cb: GridQueryCB): Boolean;
+ function iterator (grida: Integer): Boolean;
+ var
+ idx: Integer;
+ begin
+ result := false;
+ idx := mGrid[grida];
+ while idx >= 0 do
+ begin
+ if (mCells[idx].body <> nil) and (mCells[idx].body.mQueryMark <> mLastQuery) then
+ begin
+ //e_WriteLog(Format(' query #%d body hit: (%d,%d)-(%dx%d) tag:%d', [mLastQuery, mCells[idx].body.mX, mCells[idx].body.mY, mCells[idx].body.mWidth, mCells[idx].body.mHeight, mCells[idx].body.mTag]), MSG_NOTIFY);
+ mCells[idx].body.mQueryMark := mLastQuery;
+ if (cb(mCells[idx].body.mObj, mCells[idx].body.mTag)) then begin result := true; exit; end;
+ end;
+ idx := mCells[idx].next;
+ end;
+ end;
+
var
- gx, gy, idx: Integer;
- minx, miny, maxx, maxy: Integer;
+ idx: Integer;
begin
result := false;
if not assigned(cb) then exit;
- if (w < 1) or (h < 1) then exit;
- minx := x;
- miny := y;
- maxx := x+w-1;
- maxy := y+h-1;
- if (minx > maxx) or (miny > maxy) then exit;
- if (maxx < 0) or (maxy < 0) then exit;
- if (minx >= mWidth*mTileSize) or (miny >= mHeight*mTileSize) then exit;
+
// increase query counter
Inc(mLastQuery);
if (mLastQuery = 0) then
for idx := 0 to High(mCells) do if (mCells[idx].body <> nil) then mCells[idx].body.mQueryMark := 0;
end;
//e_WriteLog(Format('grid: query #%d: (%d,%d)-(%dx%d)', [mLastQuery, minx, miny, maxx, maxy]), MSG_NOTIFY);
- // process grid
- for gy := miny div mTileSize to maxy div mTileSize do
- begin
- if (gy < 0) then continue;
- if (gy >= mHeight) then break;
- for gx := minx div mTileSize to maxx div mTileSize do
- begin
- if (gx < 0) then continue;
- if (gx >= mWidth) then break;
- idx := mGrid[gy*mWidth+gx];
- while idx >= 0 do
- begin
- if (mCells[idx].body <> nil) and (mCells[idx].body.mQueryMark <> mLastQuery) then
- begin
- //e_WriteLog(Format(' query #%d body hit: (%d,%d)-(%dx%d) tag:%d', [mLastQuery, mCells[idx].body.mX, mCells[idx].body.mY, mCells[idx].body.mWidth, mCells[idx].body.mHeight, mCells[idx].body.mTag]), MSG_NOTIFY);
- mCells[idx].body.mQueryMark := mLastQuery;
- if (cb(mCells[idx].body.mObj, mCells[idx].body.mTag)) then begin result := true; exit; end;
- end;
- idx := mCells[idx].next;
- end;
- end;
- end;
+
+ result := forGridRect(x, y, w, h, iterator);
end;
function TBodyGrid.getProxyForBody (aObj: TObject; x, y, w, h: Integer): TBodyProxy;
+var
+ res: TBodyProxy = nil;
- function qq (obj: TObject; tag: Integer): Boolean;
+ function iterator (grida: Integer): Boolean;
+ var
+ idx: Integer;
begin
- result := (obj = aObj);
+ result := false;
+ idx := mGrid[grida];
+ while idx >= 0 do
+ begin
+ if (mCells[idx].body <> nil) and (mCells[idx].body = aObj) then
+ begin
+ result := true;
+ res := mCells[idx].body;
+ exit;
+ end;
+ idx := mCells[idx].next;
+ end;
end;
begin
result := nil;
- forEachInAABB(x, y, w, h, qq);
+ if (aObj = nil) then exit;
+ forGridRect(x, y, w, h, iterator);
+ result := res;
end;