(* Copyright (C) Doom 2D: Forever Developers
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3 of the License ONLY.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*)
// universal spatial grid
{$INCLUDE ../shared/a_modes.inc}
{$IF DEFINED(D2F_DEBUG)}
{.$DEFINE D2F_DEBUG_RAYTRACE}
{.$DEFINE D2F_DEBUG_XXQ}
{.$DEFINE D2F_DEBUG_MOVER}
{$ENDIF}
{.$DEFINE GRID_USE_ORTHO_ACCEL}
{$DEFINE LINEAABB2}
unit g_grid;
interface
uses
mempool;
(*
* In order to make this usable for kind-of-recursive calls,
* we'll use "frame memory pool" to return results. That is,
* we will allocate a memory pool that will be cleared on
* frame start, and then used as a simple "no-free" allocator.
* Grid will put results into this pool, and will never bother
* to free it. Caller should call "release" on result, and
* the pool will throw away everything.
* No more callbacks, of course.
*)
const
GridTileSize = 32; // must be power of two!
type
PGridCellCoord = ^TGridCellCoord;
TGridCellCoord = record
x, y: Integer;
end;
CellCoordIter = specialize PoolIter;
type
TBodyProxyId = Integer;
generic TBodyGridBase = class{$IFDEF USE_MEMPOOL}(TPoolObject){$ENDIF}
public
type PITP = ^ITP;
type TCellQueryCB = procedure (x, y: Integer) is nested; // top-left cell corner coords
type Iter = specialize PoolIter;
const TagDisabled = $40000000;
const TagFullMask = $3fffffff;
private
const
GridCellBucketSize = 8; // WARNING! can't be less than 2!
public
type
PBodyProxyRec = ^TBodyProxyRec;
TBodyProxyRec = record
private
mX, mY, mWidth, mHeight: Integer; // aabb
mQueryMark: LongWord; // was this object visited at this query?
mObj: ITP;
mTag: Integer; // `TagDisabled` set: disabled ;-)
nextLink: TBodyProxyId; // next free or nothing
private
procedure setup (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer);
function getTag (): Integer; inline;
procedure setTag (v: Integer); inline;
function getEnabled (): Boolean; inline;
procedure setEnabled (v: Boolean); inline;
function getX1 (): Integer; inline;
function getY1 (): Integer; inline;
public
property x: Integer read mX;
property y: Integer read mY;
property width: Integer read mWidth;
property height: Integer read mHeight;
property tag: Integer read getTag write setTag;
property enabled: Boolean read getEnabled write setEnabled;
property obj: ITP read mObj;
property x0: Integer read mX;
property y0: Integer read mY;
property x1: Integer read getX1;
property y1: Integer read getY1;
end;
private
type
PGridCell = ^TGridCell;
TGridCell = record
bodies: array [0..GridCellBucketSize-1] of Integer; // -1: end of list
next: Integer; // in this cell; index in mCells
end;
TCellArray = array of TGridCell;
TGridInternalCB = function (grida: Integer; bodyId: TBodyProxyId): Boolean of object; // return `true` to stop
private
//mTileSize: Integer;
const mTileSize = GridTileSize;
type TGetProxyFn = function (pxidx: Integer): PBodyProxyRec of object;
public
const tileSize = mTileSize;
type
TAtPointEnumerator = record
private
mCells: TCellArray;
curidx, curbki: Integer;
getpx: TGetProxyFn;
public
constructor Create (acells: TCellArray; aidx: Integer; agetpx: TGetProxyFn);
function MoveNext (): Boolean; inline;
function getCurrent (): PBodyProxyRec; inline;
property Current: PBodyProxyRec read getCurrent;
end;
private
mMinX, mMinY: Integer; // so grids can start at any origin
mWidth, mHeight: Integer; // in tiles
mGrid: array of Integer; // mWidth*mHeight, index in mCells
mCells: TCellArray; // cell pool
mFreeCell: Integer; // first free cell index or -1
mLastQuery: LongWord;
mUsedCells: Integer;
mProxies: array of TBodyProxyRec;
mProxyFree: TBodyProxyId; // free
mProxyCount: Integer; // currently used
mProxyMaxCount: Integer;
public
dbgShowTraceLog: Boolean;
{$IF DEFINED(D2F_DEBUG)}
dbgRayTraceTileHitCB: TCellQueryCB;
{$ENDIF}
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);
function forGridRect (x, y, w, h: Integer; cb: TGridInternalCB; bodyId: TBodyProxyId): 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;
function getGridWidthPx (): Integer; inline;
function getGridHeightPx (): Integer; inline;
function getProxyById (idx: TBodyProxyId): PBodyProxyRec; inline;
public
constructor Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer{; aTileSize: Integer=GridDefaultTileSize});
destructor Destroy (); override;
function insertBody (aObj: ITP; ax, ay, aWidth, aHeight: Integer; aTag: Integer=-1): TBodyProxyId;
procedure removeBody (body: TBodyProxyId); // WARNING! this WILL destroy proxy!
procedure moveBody (body: TBodyProxyId; nx, ny: Integer);
procedure resizeBody (body: TBodyProxyId; nw, nh: Integer);
procedure moveResizeBody (body: TBodyProxyId; nx, ny, nw, nh: Integer);
function insideGrid (x, y: Integer): Boolean; inline;
// `false` if `body` is surely invalid
function getBodyXY (body: TBodyProxyId; out rx, ry: Integer): Boolean; inline;
function getBodyWH (body: TBodyProxyId; out rw, rh: Integer): Boolean; inline;
function getBodyDims (body: TBodyProxyId; out rx, ry, rw, rh: Integer): Boolean; inline;
// return number of ITP thingys put into frame pool
// if `firstHit` is `true`, return on first hit (obviously)
function forEachInAABB (x, y, w, h: Integer; tagmask: Integer=-1; allowDisabled: Boolean=false; firstHit: Boolean=false): Iter;
// return number of ITP thingys put into frame pool
// if `firstHit` is `true`, return on first hit (obviously)
function forEachAtPoint (x, y: Integer; tagmask: Integer=-1; allowDisabled: Boolean=false; firstHit: Boolean=false): Iter;
function atCellInPoint (x, y: Integer): TAtPointEnumerator;
// return object of the nearest hit or nil
function traceRay (const x0, y0, x1, y1: Integer; tagmask: Integer=-1): ITP; overload;
function traceRay (out ex, ey: Integer; const ax0, ay0, ax1, ay1: Integer; tagmask: Integer=-1): ITP;
// return `false` if we're still inside at the end
// line should be either strict horizontal, or strict vertical, otherwise an exception will be thrown
// `true`: endpoint will point at the last "inside" pixel
// `false`: endpoint will be (ax1, ay1)
function traceOrthoRayWhileIn (out ex, ey: Integer; ax0, ay0, ax1, ay1: Integer; tagmask: Integer=-1): Boolean;
// trace line along the grid, put all objects from passed cells into frame pool, in no particular order
// return number of ITP thingys put into frame pool
function forEachAlongLine (ax0, ay0, ax1, ay1: Integer; tagmask: Integer=-1; log: Boolean=false): Iter;
// 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
//WARNING: don't change tags in callbacks here!
function traceBox (out ex, ey: Integer; const ax0, ay0, aw, ah: Integer; const dx, dy: Integer; tagmask: Integer=-1): ITP;
// debug
function forEachBodyCell (body: TBodyProxyId): CellCoordIter; // this puts `TGridCellCoord` into frame pool for each cell
function forEachInCell (x, y: Integer): Iter; // this puts `ITP` into frame pool
procedure dumpStats ();
public
//WARNING! no sanity checks!
property proxyEnabled[pid: TBodyProxyId]: Boolean read getProxyEnabled write setProxyEnabled;
property gridX0: Integer read mMinX;
property gridY0: Integer read mMinY;
property gridWidth: Integer read getGridWidthPx; // in pixels
property gridHeight: Integer read getGridHeightPx; // in pixels
property proxy[idx: TBodyProxyId]: PBodyProxyRec read getProxyById;
end;
type
// common structure for all line tracers
TLineWalker = record
public
const TileSize = GridTileSize;
private
wx0, wy0, wx1, wy1: Integer; // window coordinates
stx, sty: Integer; // "steps" for x and y axes
stleft: Integer; // "steps left"
err, errinc, errmax: Integer;
xd, yd: Integer; // current coord
horiz: Boolean;
public
// call `setyp` after this
constructor Create (minx, miny, maxx, maxy: Integer);
procedure setClip (minx, miny, maxx, maxy: Integer); inline;
// this will use `w[xy][01]` to clip coords
// return `false` if the whole line was clipped away
// on `true`, you should process first point, and go on
function setup (x0, y0, x1, y1: Integer): Boolean;
// call this *after* doing a step
// WARNING! if you will do a step when this returns `true`, you will fall into limbo
function done (): Boolean; inline;
// as you will prolly call `done()` after doing a step anyway, this will do it for you
// move to next point, return `true` when the line is complete (i.e. you should stop)
function step (): Boolean; inline;
// move to next tile; return `true` if the line is complete (and walker state is undefined then)
function stepToNextTile (): Boolean; inline;
procedure getXY (out ox, oy: Integer); inline;
public
// current coords
property x: Integer read xd;
property y: Integer read yd;
end;
procedure swapInt (var a: Integer; var b: Integer); inline;
//function minInt (a, b: Integer): Integer; inline;
//function maxInt (a, b: Integer): Integer; inline;
implementation
uses
SysUtils, e_log, g_console, geom, utils;
// ////////////////////////////////////////////////////////////////////////// //
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;
// ////////////////////////////////////////////////////////////////////////// //
constructor TLineWalker.Create (minx, miny, maxx, maxy: Integer);
begin
setClip(minx, miny, maxx, maxy);
end;
procedure TLineWalker.setClip (minx, miny, maxx, maxy: Integer); inline;
begin
// clip rectange
wx0 := minx;
wy0 := miny;
wx1 := maxx;
wy1 := maxy;
end;
function TLineWalker.setup (x0, y0, x1, y1: Integer): Boolean;
var
sx0, sy0, sx1, sy1: Single;
begin
if (wx1 < wx0) or (wy1 < wy0) then begin stleft := 0; xd := x0; yd := y0; result := false; exit; end;
if (x0 >= wx0) and (y0 >= wy0) and (x0 <= wx1) and (y0 <= wy1) and
(x1 >= wx0) and (y1 >= wy0) and (x1 <= wx1) and (y1 <= wy1) then
begin
result := true;
end
else
begin
sx0 := x0; sy0 := y0;
sx1 := x1; sy1 := y1;
result := clipLine(sx0, sy0, sx1, sy1, wx0, wy0, wx1, wy1);
if not result then begin stleft := 0; xd := x0; yd := y0; exit; end;
x0 := trunc(sx0); y0 := trunc(sy0);
x1 := trunc(sx1); y1 := trunc(sy1);
end;
// check for ortho lines
if (y0 = y1) then
begin
// horizontal
horiz := true;
stleft := abs(x1-x0)+1;
if (x0 < x1) then stx := 1 else stx := -1;
sty := 0;
errinc := 0;
errmax := 10; // anything that is greater than zero
end
else if (x0 = x1) then
begin
// vertical
horiz := false;
stleft := abs(y1-y0)+1;
stx := 0;
if (y0 < y1) then sty := 1 else sty := -1;
errinc := 0;
errmax := 10; // anything that is greater than zero
end
else
begin
// diagonal
if (abs(x1-x0) >= abs(y1-y0)) then
begin
// horizontal
horiz := true;
stleft := abs(x1-x0)+1;
errinc := abs(y1-y0)+1;
end
else
begin
// vertical
horiz := false;
stleft := abs(y1-y0)+1;
errinc := abs(x1-x0)+1;
end;
if (x0 < x1) then stx := 1 else stx := -1;
if (y0 < y1) then sty := 1 else sty := -1;
errmax := stleft;
end;
xd := x0;
yd := y0;
err := -errmax;
end;
function TLineWalker.done (): Boolean; inline; begin result := (stleft <= 0); end;
// true: done
function TLineWalker.step (): Boolean; inline;
begin
if horiz then
begin
xd += stx;
err += errinc;
if (err >= 0) then begin err -= errmax; yd += sty; end;
end
else
begin
yd += sty;
err += errinc;
if (err >= 0) then begin err -= errmax; xd += stx; end;
end;
Dec(stleft);
result := (stleft <= 0);
end;
// true: done
function TLineWalker.stepToNextTile (): Boolean; inline;
var
ex, ey: Integer;
xwalk, ywalk, wklen: Integer; // to the respective edges
f: Integer;
begin
result := false;
if (stleft < 2) then begin result := true; exit; end; // max one pixel left, nothing to do
// strictly horizontal?
if (sty = 0) then
begin
// only xd
if (stx < 0) then
begin
// xd: to left edge
ex := (xd and (not (TileSize-1)))-1;
stleft -= xd-ex;
end
else
begin
// xd: to right edge
ex := (xd or (TileSize-1))+1;
stleft -= ex-xd;
end;
result := (stleft <= 0);
xd := ex;
exit;
end;
// strictly vertical?
if (stx = 0) then
begin
// only xd
if (sty < 0) then
begin
// yd: to top edge
ey := (yd and (not (TileSize-1)))-1;
stleft -= yd-ey;
end
else
begin
// yd: to bottom edge
ey := (yd or (TileSize-1))+1;
stleft -= ey-yd;
end;
result := (stleft <= 0);
yd := ey;
exit;
end;
// diagonal
// calculate xwalk
if (stx < 0) then
begin
ex := (xd and (not (TileSize-1)))-1;
xwalk := xd-ex;
end
else
begin
ex := (xd or (TileSize-1))+1;
xwalk := ex-xd;
end;
// calculate ywalk
if (sty < 0) then
begin
ey := (yd and (not (TileSize-1)))-1;
ywalk := yd-ey;
end
else
begin
ey := (yd or (TileSize-1))+1;
ywalk := ey-yd;
end;
{
while (xd <> ex) and (yd <> ey) do
begin
if horiz then
begin
xd += stx;
err += errinc;
if (err >= 0) then begin err -= errmax; yd += sty; end;
end
else
begin
yd += sty;
err += errinc;
if (err >= 0) then begin err -= errmax; xd += stx; end;
end;
Dec(stleft);
if (stleft < 1) then begin result := true; exit; end;
end;
}
if (xwalk <= ywalk) then wklen := xwalk else wklen := ywalk;
while true do
begin
// in which dir we want to walk?
stleft -= wklen;
if (stleft <= 0) then begin result := true; exit; end;
if horiz then
begin
xd += wklen*stx;
for f := 1 to wklen do
begin
err += errinc;
if (err >= 0) then begin err -= errmax; yd += sty; end;
end;
end
else
begin
yd += wklen*sty;
for f := 1 to wklen do
begin
err += errinc;
if (err >= 0) then begin err -= errmax; xd += stx; end;
end;
end;
// check for walk completion
if (xd = ex) or (yd = ey) then exit;
wklen := 1;
end;
end;
procedure TLineWalker.getXY (out ox, oy: Integer); inline; begin ox := xd; oy := yd; end;
// ////////////////////////////////////////////////////////////////////////// //
procedure TBodyGridBase.TBodyProxyRec.setup (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer);
begin
mX := aX;
mY := aY;
mWidth := aWidth;
mHeight := aHeight;
mQueryMark := 0;
mObj := aObj;
mTag := aTag;
nextLink := -1;
end;
function TBodyGridBase.TBodyProxyRec.getTag (): Integer; inline;
begin
result := mTag and TagFullMask;
end;
procedure TBodyGridBase.TBodyProxyRec.setTag (v: Integer); inline;
begin
mTag := (mTag and TagDisabled) or (v and TagFullMask);
end;
function TBodyGridBase.TBodyProxyRec.getEnabled (): Boolean; inline;
begin
result := ((mTag and TagDisabled) = 0);
end;
procedure TBodyGridBase.TBodyProxyRec.setEnabled (v: Boolean); inline;
begin
if v then mTag := mTag and (not TagDisabled) else mTag := mTag or TagDisabled;
end;
function TBodyGridBase.TBodyProxyRec.getX1 (): Integer; inline;
begin
result := mX+mWidth-1;
end;
function TBodyGridBase.TBodyProxyRec.getY1 (): Integer; inline;
begin
result := mY+mHeight-1;
end;
// ////////////////////////////////////////////////////////////////////////// //
constructor TBodyGridBase.TAtPointEnumerator.Create (acells: TCellArray; aidx: Integer; agetpx: TGetProxyFn);
begin
mCells := acells;
curidx := aidx;
curbki := -1;
getpx := agetpx;
end;
function TBodyGridBase.TAtPointEnumerator.MoveNext (): Boolean; inline;
begin
while (curidx <> -1) do
begin
while (curbki < GridCellBucketSize) do
begin
Inc(curbki);
if (mCells[curidx].bodies[curbki] = -1) then break;
result := true;
exit;
end;
curidx := mCells[curidx].next;
curbki := -1;
end;
result := false;
end;
function TBodyGridBase.TAtPointEnumerator.getCurrent (): PBodyProxyRec; inline;
begin
result := getpx(mCells[curidx].bodies[curbki]);
end;
// ////////////////////////////////////////////////////////////////////////// //
constructor TBodyGridBase.Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer{; aTileSize: Integer=GridDefaultTileSize});
var
idx: Integer;
begin
dbgShowTraceLog := false;
{$IF DEFINED(D2F_DEBUG)}
dbgRayTraceTileHitCB := nil;
{$ENDIF}
{
if aTileSize < 1 then aTileSize := 1;
if aTileSize > 8192 then aTileSize := 8192; // arbitrary limit
mTileSize := aTileSize;
}
if (aPixWidth < mTileSize) then aPixWidth := mTileSize;
if (aPixHeight < mTileSize) then aPixHeight := mTileSize;
mMinX := aMinPixX;
mMinY := aMinPixY;
mWidth := (aPixWidth+mTileSize-1) div mTileSize;
mHeight := (aPixHeight+mTileSize-1) div mTileSize;
SetLength(mGrid, mWidth*mHeight);
SetLength(mCells, mWidth*mHeight);
SetLength(mProxies, 8192);
mFreeCell := 0;
// init free list
for idx := 0 to High(mCells) do
begin
mCells[idx].bodies[0] := -1;
mCells[idx].bodies[GridCellBucketSize-1] := -1; // "has free room" flag
mCells[idx].next := idx+1;
end;
mCells[High(mCells)].next := -1; // last cell
// init grid
for idx := 0 to High(mGrid) do mGrid[idx] := -1;
// init proxies
for idx := 0 to High(mProxies) do mProxies[idx].nextLink := idx+1;
mProxies[High(mProxies)].nextLink := -1;
mLastQuery := 0;
mUsedCells := 0;
mProxyFree := 0;
mProxyCount := 0;
mProxyMaxCount := 0;
e_WriteLog(Format('created grid with size: %dx%d (tile size: %d); pix: %dx%d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize]), TMsgType.Notify);
end;
destructor TBodyGridBase.Destroy ();
begin
mCells := nil;
mGrid := nil;
mProxies := nil;
inherited;
end;
// ////////////////////////////////////////////////////////////////////////// //
procedure TBodyGridBase.dumpStats ();
var
idx, mcb, ccidx, cnt: Integer;
begin
mcb := 0;
for idx := 0 to High(mGrid) do
begin
ccidx := mGrid[idx];
cnt := 0;
while ccidx >= 0 do
begin
Inc(cnt);
ccidx := mCells[ccidx].next;
end;
if (mcb < cnt) then mcb := cnt;
end;
e_WriteLog(Format('grid size: %dx%d (tile size: %d); pix: %dx%d; used cells: %d; max bodies in cell: %d; max proxies allocated: %d; proxies used: %d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize, mUsedCells, mcb, mProxyMaxCount, mProxyCount]), TMsgType.Notify);
end;
function TBodyGridBase.forEachBodyCell (body: TBodyProxyId): CellCoordIter;
var
g, f, ccidx: Integer;
cc: PGridCell;
presobj: PGridCellCoord;
begin
result := CellCoordIter.Create(framePool);
if (body < 0) or (body > High(mProxies)) then begin result.finishIt(); exit; end;
for g := 0 to High(mGrid) do
begin
ccidx := mGrid[g];
while (ccidx <> -1) do
begin
cc := @mCells[ccidx];
for f := 0 to GridCellBucketSize-1 do
begin
if (cc.bodies[f] = -1) then break;
if (cc.bodies[f] = body) then
begin
presobj := PGridCellCoord(framePool.alloc(sizeof(TGridCellCoord)));
presobj^.x := (g mod mWidth)*mTileSize+mMinX;
presobj^.y := (g div mWidth)*mTileSize+mMinY;
//cb((g mod mWidth)*mTileSize+mMinX, (g div mWidth)*mTileSize+mMinY);
end;
end;
// next cell
ccidx := cc.next;
end;
end;
result.finishIt();
end;
function TBodyGridBase.forEachInCell (x, y: Integer): Iter;
var
f, ccidx: Integer;
cc: PGridCell;
presobj: PITP;
begin
result := Iter.Create(framePool);
Dec(x, mMinX);
Dec(y, mMinY);
if (x < 0) or (y < 0) or (x >= mWidth*mTileSize) or (y > mHeight*mTileSize) then begin result.finishIt(); exit; end;
ccidx := mGrid[(y div mTileSize)*mWidth+(x div mTileSize)];
while (ccidx <> -1) do
begin
cc := @mCells[ccidx];
for f := 0 to GridCellBucketSize-1 do
begin
if (cc.bodies[f] = -1) then break;
//if cb(mProxies[cc.bodies[f]].mObj, mProxies[cc.bodies[f]].mTag) then begin result := mProxies[cc.bodies[f]].mObj; exit; end;
presobj := PITP(framePool.alloc(sizeof(ITP)));
//presobj^ := mProxies[cc.bodies[f]].mObj;
Move(mProxies[cc.bodies[f]].mObj, presobj^, sizeof(ITP));
end;
// next cell
ccidx := cc.next;
end;
result.finishIt();
end;
// ////////////////////////////////////////////////////////////////////////// //
function TBodyGridBase.getGridWidthPx (): Integer; inline; begin result := mWidth*mTileSize; end;
function TBodyGridBase.getGridHeightPx (): Integer; inline; begin result := mHeight*mTileSize; 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.getBodyXY (body: TBodyProxyId; out rx, ry: Integer): Boolean; inline;
begin
if (body >= 0) and (body < Length(mProxies)) then
begin
with mProxies[body] do begin rx := mX; ry := mY; end;
result := true;
end
else
begin
rx := 0;
ry := 0;
result := false;
end;
end;
function TBodyGridBase.getBodyWH (body: TBodyProxyId; out rw, rh: Integer): Boolean; inline;
begin
if (body >= 0) and (body < Length(mProxies)) then
begin
with mProxies[body] do begin rw := mWidth; rh := mHeight; end;
result := true;
end
else
begin
rw := 0;
rh := 0;
result := false;
end;
end;
function TBodyGridBase.getBodyDims (body: TBodyProxyId; out rx, ry, rw, rh: Integer): Boolean; inline;
begin
if (body >= 0) and (body < Length(mProxies)) then
begin
with mProxies[body] do begin rx := mX; ry := mY; rw := mWidth; rh := mHeight; end;
result := true;
end
else
begin
rx := 0;
ry := 0;
rw := 0;
rh := 0;
result := false;
end;
end;
// ////////////////////////////////////////////////////////////////////////// //
function TBodyGridBase.getProxyEnabled (pid: TBodyProxyId): Boolean; inline;
begin
if (pid >= 0) and (pid < Length(mProxies)) then result := ((mProxies[pid].mTag and TagDisabled) = 0) else result := false;
end;
procedure TBodyGridBase.setProxyEnabled (pid: TBodyProxyId; val: Boolean); inline;
begin
if (pid >= 0) and (pid < Length(mProxies)) 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.getProxyById (idx: TBodyProxyId): PBodyProxyRec; inline;
begin
if (idx >= 0) and (idx < Length(mProxies)) then result := @mProxies[idx] else result := nil;
end;
// ////////////////////////////////////////////////////////////////////////// //
function TBodyGridBase.allocCell (): Integer;
var
idx: Integer;
pc: PGridCell;
begin
if (mFreeCell < 0) then
begin
// no free cells, want more
mFreeCell := Length(mCells);
SetLength(mCells, mFreeCell+32768); // arbitrary number
for idx := mFreeCell to High(mCells) do
begin
mCells[idx].bodies[0] := -1;
mCells[idx].bodies[GridCellBucketSize-1] := -1; // 'has free room' flag
mCells[idx].next := idx+1;
end;
mCells[High(mCells)].next := -1; // last cell
end;
result := mFreeCell;
pc := @mCells[result];
mFreeCell := pc.next;
pc.next := -1;
Inc(mUsedCells);
//e_WriteLog(Format('grid: allocated new cell #%d (total: %d)', [result, mUsedCells]), MSG_NOTIFY);
end;
procedure TBodyGridBase.freeCell (idx: Integer);
begin
if (idx >= 0) and (idx < Length(mCells)) then
begin
with mCells[idx] do
begin
bodies[0] := -1;
bodies[GridCellBucketSize-1] := -1; // 'has free room' flag
next := mFreeCell;
end;
mFreeCell := idx;
Dec(mUsedCells);
end;
end;
// ////////////////////////////////////////////////////////////////////////// //
function TBodyGridBase.allocProxy (aX, aY, aWidth, aHeight: Integer; aObj: ITP; aTag: Integer): TBodyProxyId;
var
olen, idx: Integer;
px: PBodyProxyRec;
begin
if (mProxyFree = -1) then
begin
// no free proxies, resize list
olen := Length(mProxies);
SetLength(mProxies, olen+8192); // arbitrary number
for idx := olen to High(mProxies) do mProxies[idx].nextLink := idx+1;
mProxies[High(mProxies)].nextLink := -1;
mProxyFree := olen;
end;
// get one from list
result := mProxyFree;
px := @mProxies[result];
mProxyFree := px.nextLink;
px.setup(aX, aY, aWidth, aHeight, aObj, aTag);
// add to used list
px.nextLink := -1;
// statistics
Inc(mProxyCount);
if (mProxyMaxCount < mProxyCount) then mProxyMaxCount := mProxyCount;
end;
procedure TBodyGridBase.freeProxy (body: TBodyProxyId);
begin
if (body < 0) or (body > High(mProxies)) then exit; // just in case
if (mProxyCount = 0) then raise Exception.Create('wutafuuuuu in grid (no allocated proxies, what i should free now?)');
// add to free list
mProxies[body].mObj := nil;
mProxies[body].nextLink := mProxyFree;
mProxyFree := body;
Dec(mProxyCount);
end;
// ////////////////////////////////////////////////////////////////////////// //
function TBodyGridBase.forGridRect (x, y, w, h: Integer; cb: TGridInternalCB; bodyId: TBodyProxyId): Boolean;
var
gw, gh: Integer;
ex, ey: Integer;
gx, gy: Integer;
begin
result := false;
if (w < 1) or (h < 1) or not assigned(cb) then exit;
// fix coords
Dec(x, mMinX);
Dec(y, mMinY);
// go on
if (x+w <= 0) or (y+h <= 0) then exit;
gw := mWidth;
gh := mHeight;
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
result := cb(gy*gw+gx, bodyId);
if result then exit;
end;
end;
end;
// ////////////////////////////////////////////////////////////////////////// //
function TBodyGridBase.inserter (grida: Integer; bodyId: TBodyProxyId): Boolean;
var
ccidx: Integer;
pc: Integer;
pi: PGridCell;
f: Integer;
begin
result := false; // never stop
// add body to the given grid cell
pc := mGrid[grida];
if (pc <> -1) then
begin
{$IF DEFINED(D2F_DEBUG)}
ccidx := pc;
while (ccidx <> -1) do
begin
pi := @mCells[ccidx];
for f := 0 to GridCellBucketSize-1 do
begin
if (pi.bodies[f] = -1) then break;
if (pi.bodies[f] = bodyId) then raise Exception.Create('trying to insert already inserted proxy');
end;
ccidx := pi.next;
end;
{$ENDIF}
ccidx := pc;
while (ccidx <> -1) do
begin
pi := @mCells[ccidx];
// check "has room" flag
if (pi.bodies[GridCellBucketSize-1] = -1) then
begin
// can add here
for f := 0 to GridCellBucketSize-1 do
begin
if (pi.bodies[f] = -1) then
begin
pi.bodies[f] := bodyId;
if (f+1 < GridCellBucketSize) then pi.bodies[f+1] := -1;
exit;
end;
end;
raise Exception.Create('internal error in grid inserter');
end;
// no room, go to next cell in list (if there is any)
ccidx := pi.next;
end;
// no room in cells, add new cell to list
end;
// either no room, or no cell at all
ccidx := allocCell();
pi := @mCells[ccidx];
pi.bodies[0] := bodyId;
pi.bodies[1] := -1;
pi.next := pc;
mGrid[grida] := ccidx;
end;
// assume that we cannot have one object added to bucket twice
function TBodyGridBase.remover (grida: Integer; bodyId: TBodyProxyId): Boolean;
var
f, c: Integer;
pidx, ccidx: Integer;
pc: PGridCell;
begin
result := false; // never stop
// find and remove cell
pidx := -1; // previous cell index
ccidx := mGrid[grida]; // current cell index
while (ccidx <> -1) do
begin
pc := @mCells[ccidx];
for f := 0 to GridCellBucketSize-1 do
begin
if (pc.bodies[f] = bodyId) then
begin
// i found her!
if (f = 0) and (pc.bodies[1] = -1) then
begin
// this cell contains no elements, remove it
if (pidx = -1) then mGrid[grida] := pc.next else mCells[pidx].next := pc.next;
freeCell(ccidx);
exit;
end;
// remove element from bucket
for c := f to GridCellBucketSize-2 do
begin
pc.bodies[c] := pc.bodies[c+1];
if (pc.bodies[c] = -1) then break;
end;
pc.bodies[GridCellBucketSize-1] := -1; // "has free room" flag
exit;
end;
end;
pidx := ccidx;
ccidx := pc.next;
end;
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);
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
px := @mProxies[body];
//removeInternal(body);
forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover, body);
freeProxy(body);
end;
// ////////////////////////////////////////////////////////////////////////// //
procedure TBodyGridBase.moveResizeBody (body: TBodyProxyId; nx, ny, nw, nh: Integer);
var
px: PBodyProxyRec;
x0, y0, w, h: Integer;
begin
if (body < 0) or (body > High(mProxies)) then exit; // just in case
px := @mProxies[body];
x0 := px.mX;
y0 := px.mY;
w := px.mWidth;
h := px.mHeight;
{$IF DEFINED(D2F_DEBUG_MOVER)}
e_WriteLog(Format('proxy #%d: MOVERESIZE: xg=%d;yg=%d;w=%d;h=%d;nx=%d;ny=%d;nw=%d;nh=%d', [body, x0-mMinX, y0-mMinY, w, h, nx-mMinX, ny-mMinY, nw, nh]), MSG_NOTIFY);
{$ENDIF}
if (nx = x0) and (ny = y0) and (nw = w) and (nh = h) then exit;
// map -> grid
Dec(x0, mMinX);
Dec(y0, mMinY);
Dec(nx, mMinX);
Dec(ny, mMinY);
// did any corner crossed tile boundary?
if (x0 div mTileSize <> nx div mTileSize) or
(y0 div mTileSize <> ny div mTileSize) or
((x0+w-1) div mTileSize <> (nx+nw-1) div mTileSize) or
((y0+h-1) div mTileSize <> (ny+nh-1) div mTileSize) then
begin
//writeln('moveResizeBody: cell occupation changed! old=(', x0, ',', y0, ')-(', x0+w-1, ',', y0+h-1, '); new=(', nx, ',', ny, ')-(', nx+nw-1, ',', ny+nh-1, ')');
//removeInternal(body);
forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover, body);
px.mX := nx+mMinX;
px.mY := ny+mMinY;
px.mWidth := nw;
px.mHeight := nh;
//insertInternal(body);
forGridRect(px.mX, px.mY, nw, nh, inserter, body);
end
else
begin
px.mX := nx+mMinX;
px.mY := ny+mMinY;
px.mWidth := nw;
px.mHeight := nh;
end;
end;
//TODO: optimize for horizontal/vertical moves
procedure TBodyGridBase.moveBody (body: TBodyProxyId; nx, ny: Integer);
var
px: PBodyProxyRec;
x0, y0: Integer;
ogx0, ogx1, ogy0, ogy1: Integer; // old grid rect
ngx0, ngx1, ngy0, ngy1: Integer; // new grid rect
gx, gy: Integer;
gw, gh: Integer;
pw, ph: Integer;
begin
if (body < 0) or (body > High(mProxies)) then exit; // just in case
// check if tile coords was changed
px := @mProxies[body];
x0 := px.mX;
y0 := px.mY;
if (nx = x0) and (ny = y0) then exit;
// map -> grid
Dec(x0, mMinX);
Dec(y0, mMinY);
Dec(nx, mMinX);
Dec(ny, mMinY);
// check for heavy work
pw := px.mWidth;
ph := px.mHeight;
ogx0 := x0 div mTileSize;
ogy0 := y0 div mTileSize;
ngx0 := nx div mTileSize;
ngy0 := ny div mTileSize;
ogx1 := (x0+pw-1) div mTileSize;
ogy1 := (y0+ph-1) div mTileSize;
ngx1 := (nx+pw-1) div mTileSize;
ngy1 := (ny+ph-1) div mTileSize;
{$IF DEFINED(D2F_DEBUG_MOVER)}
e_WriteLog(Format('proxy #%d: checkmove: xg=%d;yg=%d;w=%d;h=%d;nx=%d;ny=%d og:(%d,%d)-(%d,%d); ng:(%d,%d)-(%d,%d)', [body, x0, y0, pw, ph, nx, ny, ogx0, ogy0, ogx1, ogy1, ngx0, ngy0, ngx1, ngy1]), MSG_NOTIFY);
{$ENDIF}
if (ogx0 <> ngx0) or (ogy0 <> ngy0) or (ogx1 <> ngx1) or (ogy1 <> ngy1) then
begin
// crossed tile boundary, do heavy work
gw := mWidth;
gh := mHeight;
// cycle with old rect, remove body where it is necessary
// optimized for horizontal moves
{$IF DEFINED(D2F_DEBUG_MOVER)}
e_WriteLog(Format('proxy #%d: xg=%d;yg=%d;w=%d;h=%d;nx=%d;ny=%d og:(%d,%d)-(%d,%d); ng:(%d,%d)-(%d,%d)', [body, x0, y0, pw, ph, nx, ny, ogx0, ogy0, ogx1, ogy1, ngx0, ngy0, ngx1, ngy1]), MSG_NOTIFY);
{$ENDIF}
// remove stale marks
if not ((ogy0 >= gh) or (ogy1 < 0)) and
not ((ogx0 >= gw) or (ogx1 < 0)) then
begin
if (ogx0 < 0) then ogx0 := 0;
if (ogy0 < 0) then ogy0 := 0;
if (ogx1 > gw-1) then ogx1 := gw-1;
if (ogy1 > gh-1) then ogy1 := gh-1;
{$IF DEFINED(D2F_DEBUG_MOVER)}
e_WriteLog(Format(' norm og:(%d,%d)-(%d,%d)', [ogx0, ogy0, ogx1, ogy1]), MSG_NOTIFY);
{$ENDIF}
for gx := ogx0 to ogx1 do
begin
if (gx < ngx0) or (gx > ngx1) then
begin
// this column is completely outside of new rect
for gy := ogy0 to ogy1 do
begin
{$IF DEFINED(D2F_DEBUG_MOVER)}
e_WriteLog(Format(' remove0:(%d,%d)', [gx, gy]), MSG_NOTIFY);
{$ENDIF}
remover(gy*gw+gx, body);
end;
end
else
begin
// heavy checks
for gy := ogy0 to ogy1 do
begin
if (gy < ngy0) or (gy > ngy1) then
begin
{$IF DEFINED(D2F_DEBUG_MOVER)}
e_WriteLog(Format(' remove1:(%d,%d)', [gx, gy]), MSG_NOTIFY);
{$ENDIF}
remover(gy*gw+gx, body);
end;
end;
end;
end;
end;
// cycle with new rect, add body where it is necessary
if not ((ngy0 >= gh) or (ngy1 < 0)) and
not ((ngx0 >= gw) or (ngx1 < 0)) then
begin
if (ngx0 < 0) then ngx0 := 0;
if (ngy0 < 0) then ngy0 := 0;
if (ngx1 > gw-1) then ngx1 := gw-1;
if (ngy1 > gh-1) then ngy1 := gh-1;
{$IF DEFINED(D2F_DEBUG_MOVER)}
e_WriteLog(Format(' norm ng:(%d,%d)-(%d,%d)', [ngx0, ngy0, ngx1, ngy1]), MSG_NOTIFY);
{$ENDIF}
for gx := ngx0 to ngx1 do
begin
if (gx < ogx0) or (gx > ogx1) then
begin
// this column is completely outside of old rect
for gy := ngy0 to ngy1 do
begin
{$IF DEFINED(D2F_DEBUG_MOVER)}
e_WriteLog(Format(' insert0:(%d,%d)', [gx, gy]), MSG_NOTIFY);
{$ENDIF}
inserter(gy*gw+gx, body);
end;
end
else
begin
// heavy checks
for gy := ngy0 to ngy1 do
begin
if (gy < ogy0) or (gy > ogy1) then
begin
{$IF DEFINED(D2F_DEBUG_MOVER)}
e_WriteLog(Format(' insert1:(%d,%d)', [gx, gy]), MSG_NOTIFY);
{$ENDIF}
inserter(gy*gw+gx, body);
end;
end;
end;
end;
end;
// done
end
else
begin
{$IF DEFINED(D2F_DEBUG_MOVER)}
e_WriteLog(Format('proxy #%d: GRID OK: xg=%d;yg=%d;w=%d;h=%d;nx=%d;ny=%d og:(%d,%d)-(%d,%d); ng:(%d,%d)-(%d,%d)', [body, x0, y0, pw, ph, nx, ny, ogx0, ogy0, ogx1, ogy1, ngx0, ngy0, ngx1, ngy1]), MSG_NOTIFY);
{$ENDIF}
end;
// update coordinates
px.mX := nx+mMinX;
px.mY := ny+mMinY;
end;
procedure TBodyGridBase.resizeBody (body: TBodyProxyId; nw, nh: Integer);
var
px: PBodyProxyRec;
x0, y0, w, h: Integer;
begin
if (body < 0) or (body > High(mProxies)) then exit; // just in case
// check if tile coords was changed
px := @mProxies[body];
x0 := px.mX-mMinX;
y0 := px.mY-mMinY;
w := px.mWidth;
h := px.mHeight;
{$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);
{$ENDIF}
if ((x0+w-1) div mTileSize <> (x0+nw-1) div mTileSize) or
((y0+h-1) div mTileSize <> (y0+nh-1) div mTileSize) then
begin
// crossed tile boundary, do heavy work
//removeInternal(body);
forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover, body);
px.mWidth := nw;
px.mHeight := nh;
//insertInternal(body);
forGridRect(px.mX, px.mY, nw, nh, inserter, body);
end
else
begin
// nothing to do with the grid, just fix size
px.mWidth := nw;
px.mHeight := nh;
end;
end;
// ////////////////////////////////////////////////////////////////////////// //
function TBodyGridBase.atCellInPoint (x, y: Integer): TAtPointEnumerator;
var
ccidx: Integer = -1;
begin
Dec(x, mMinX);
Dec(y, mMinY);
if (x >= 0) and (y >= 0) and (x < mWidth*mTileSize) and (y < mHeight*mTileSize) then ccidx := mGrid[(y div mTileSize)*mWidth+(x div mTileSize)];
result := TAtPointEnumerator.Create(mCells, ccidx, getProxyById);
end;
// ////////////////////////////////////////////////////////////////////////// //
// no callback: return `true` on the first hit
function TBodyGridBase.forEachAtPoint (x, y: Integer; tagmask: Integer=-1; allowDisabled: Boolean=false; firstHit: Boolean=false): Iter;
var
f: Integer;
idx, curci: Integer;
cc: PGridCell = nil;
px: PBodyProxyRec;
lq: LongWord;
ptag: Integer;
presobj: PITP;
begin
result := Iter.Create(framePool);
tagmask := tagmask and TagFullMask;
if (tagmask = 0) then begin result.finishIt(); exit; end;
{$IF DEFINED(D2F_DEBUG_XXQ)}
if (assigned(cb)) then e_WriteLog(Format('0: grid pointquery: (%d,%d)', [x, y]), MSG_NOTIFY);
{$ENDIF}
// make coords (0,0)-based
Dec(x, mMinX);
Dec(y, mMinY);
if (x < 0) or (y < 0) or (x >= mWidth*mTileSize) or (y >= mHeight*mTileSize) then begin result.finishIt(); exit; end;
curci := mGrid[(y div mTileSize)*mWidth+(x div mTileSize)];
{$IF DEFINED(D2F_DEBUG_XXQ)}
if (assigned(cb)) then e_WriteLog(Format('1: grid pointquery: (%d,%d) (%d,%d) %d', [x, y, (x div mTileSize), (y div mTileSize), curci]), MSG_NOTIFY);
{$ENDIF}
// restore coords
Inc(x, mMinX);
Inc(y, mMinY);
// increase query counter
Inc(mLastQuery);
if (mLastQuery = 0) then
begin
// just in case of overflow
mLastQuery := 1;
for idx := 0 to High(mProxies) do mProxies[idx].mQueryMark := 0;
end;
lq := mLastQuery;
{$IF DEFINED(D2F_DEBUG_XXQ)}
if (assigned(cb)) then e_WriteLog(Format('2: grid pointquery: (%d,%d); lq=%u', [x, y, lq]), MSG_NOTIFY);
{$ENDIF}
while (curci <> -1) do
begin
{$IF DEFINED(D2F_DEBUG_XXQ)}
//if (assigned(cb)) then e_WriteLog(Format(' cell #%d', [curci]), MSG_NOTIFY);
{$ENDIF}
cc := @mCells[curci];
for f := 0 to GridCellBucketSize-1 do
begin
if (cc.bodies[f] = -1) then break;
px := @mProxies[cc.bodies[f]];
{$IF DEFINED(D2F_DEBUG_XXQ)}
//if (assigned(cb)) then e_WriteLog(Format(' proxy #%d; qm:%u; tag:%08x; tagflag:%d %u', [cc.bodies[f], px.mQueryMark, px.mTag, (px.mTag and tagmask), LongWord(px.mObj)]), MSG_NOTIFY);
{$ENDIF}
if (px.mQueryMark = lq) then continue;
px.mQueryMark := lq;
ptag := px.mTag;
if (not allowDisabled) and ((ptag and TagDisabled) <> 0) then continue;
if ((ptag and tagmask) = 0) then continue;
if (x >= px.mX) and (y >= px.mY) and (x < px.mX+px.mWidth) and (y < px.mY+px.mHeight) then
begin
presobj := PITP(framePool.alloc(sizeof(ITP)));
Move(px.mObj, presobj^, sizeof(ITP));
if (firstHit) then begin result.finishIt(); exit; end;
end;
end;
curci := cc.next;
end;
result.finishIt();
end;
// ////////////////////////////////////////////////////////////////////////// //
// no callback: return `true` on the first hit
// return number of ITP thingys put into frame pool
function TBodyGridBase.forEachInAABB (x, y, w, h: Integer; tagmask: Integer=-1; allowDisabled: Boolean=false; firstHit: Boolean=false): Iter;
var
idx: Integer;
gx, gy: Integer;
sx, sy, ex, ey: Integer;
curci: Integer;
f: Integer;
cc: PGridCell = nil;
px: PBodyProxyRec;
lq: LongWord;
gw, gh: Integer;
x0, y0: Integer;
ptag: Integer;
presobj: PITP;
begin
if (w = 1) and (h = 1) then
begin
result := forEachAtPoint(x, y, tagmask, allowDisabled, firstHit);
exit;
end;
result := Iter.Create(framePool);
if (w < 1) or (h < 1) then begin result.finishIt(); exit; end;
tagmask := tagmask and TagFullMask;
if (tagmask = 0) then begin result.finishIt(); exit; end;
x0 := x;
y0 := y;
// fix coords
Dec(x, mMinX);
Dec(y, mMinY);
gw := mWidth;
gh := mHeight;
if (x+w <= 0) or (y+h <= 0) then begin result.finishIt(); exit; end;
if (x >= gw*mTileSize) or (y >= gh*mTileSize) then begin result.finishIt(); exit; end;
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 begin result.finishIt(); exit; end; // just in case
// has something to do
// increase query counter
Inc(mLastQuery);
if (mLastQuery = 0) then
begin
// just in case of overflow
mLastQuery := 1;
for idx := 0 to High(mProxies) do mProxies[idx].mQueryMark := 0;
end;
//e_WriteLog(Format('grid: query #%d: (%d,%d)-(%dx%d)', [mLastQuery, minx, miny, maxx, maxy]), MSG_NOTIFY);
lq := mLastQuery;
// go on
for gy := sy to ey do
begin
for gx := sx to ex do
begin
// process cells
curci := mGrid[gy*gw+gx];
while (curci <> -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]];
// 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;
if (not allowDisabled) and ((ptag and TagDisabled) <> 0) then continue;
if ((ptag and tagmask) = 0) then continue;
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;
presobj := PITP(framePool.alloc(sizeof(ITP)));
Move(px.mObj, presobj^, sizeof(ITP));
if (firstHit) then begin result.finishIt(); exit; end;
end;
curci := cc.next;
end;
end;
end;
result.finishIt();
end;
// ////////////////////////////////////////////////////////////////////////// //
function TBodyGridBase.forEachAlongLine (ax0, ay0, ax1, ay1: Integer; tagmask: Integer=-1; log: Boolean=false): Iter;
var
lw: 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;
presobj: PITP;
begin
log := false;
result := Iter.Create(framePool);
tagmask := tagmask and TagFullMask;
if (tagmask = 0) then begin result.finishIt(); exit; end;
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 begin result.finishIt(); exit; end; // out of screen
// 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;
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
presobj := PITP(framePool.alloc(sizeof(ITP)));
Move(px.mObj, presobj^, sizeof(ITP));
end;
end;
// next cell
ccidx := cc.next;
end;
// done processing cells, move to next tile
until lw.stepToNextTile();
result.finishIt();
end;
// ////////////////////////////////////////////////////////////////////////// //
// trace box with the given velocity; return object hit (if any)
function TBodyGridBase.traceBox (out ex, ey: Integer; const ax0, ay0, aw, ah: Integer; const dx, dy: Integer; 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;
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
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 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;
exit;
end;
end;
end;
end;
// next cell
ccidx := cc.next;
end;
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;
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}
it: Iter;
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;
it := forEachAtPoint(ax0, ay0, tagmask, false, true);
if (it.length = 0) then begin it.release(); exit; end;
it.release();
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
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
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
(ax0 >= px.x0) and (ax0 <= px.x1) then
begin
// bound c0 and c1 to cell
c0 := nclamp(px.y0-miny, celly0, celly1);
c1 := nclamp(px.y1-miny, celly0, celly1);
// fill the thing
{$IF DEFINED(D2F_DEBUG_OTR)}
e_LogWritefln('**px.y0=%s; px.y1=%s; c0=%s; c1=%s; celly0=%s; celly1=%s; [%s..%s]', [px.y0-miny, px.y1-miny, c0, c1, celly0, celly1, c0-celly0, (c0-celly0)+(c1-c0)]);
{$ENDIF}
//assert(c0 <= c1);
FillChar(filled[c0-celly0], c1-c0+1, 1);
end;
end;
// next cell
ccidx := cc.next;
end;
{$IF DEFINED(D2F_DEBUG_OTR)}
s := formatstrf(' x=%s; ay0=%s; ay1=%s; y0=%s; celly0=%s; celly1=%s; dy=%s; [', [ax0, ay0, ay1, y0, celly0, celly1, dy]);
for f := 0 to High(filled) do if (filled[f] <> 0) then s += '1' else s += '0';
s += ']';
e_LogWriteln(s);
{$ENDIF}
// now go till we hit cell boundary or empty space
if (dy < 0) then
begin
// up
while (y0 >= celly0) and (filled[y0-celly0] <> 0) do
begin
{$IF DEFINED(D2F_DEBUG_OTR)}
e_LogWritefln(' filled: cdy=%s; y0=%s; celly0=%s; ay0=%s; ay1=%s', [y0-celly0, y0, celly0, ay0, ay1]);
{$ENDIF}
Dec(y0);
Dec(ay0);
end;
{$IF DEFINED(D2F_DEBUG_OTR)}
e_LogWritefln(' span done: cdy=%s; y0=%s; celly0=%s; ay0=%s; ay1=%s', [y0-celly0, y0, celly0, ay0, ay1]);
{$ENDIF}
if (ay0 <= ay1) then begin ey := ay1; result := false; exit; end;
if (y0 >= celly0) then begin ey := ay0+1; {assert(forEachAtPoint(ex, ey, nil, tagmask) <> nil);} result := true; exit; end;
end
else
begin
// down
while (y0 <= celly1) and (filled[y0-celly0] <> 0) do begin Inc(y0); Inc(ay0); end;
if (ay0 >= ay1) then begin ey := ay1; result := false; exit; end;
if (y0 <= celly1) then begin ey := ay0-1; result := true; exit; end;
end;
end;
end
else
begin
// horizontal
assert(false);
end;
end;
// ////////////////////////////////////////////////////////////////////////// //
function TBodyGridBase.traceRay (const x0, y0, x1, y1: Integer; tagmask: Integer=-1): ITP;
var
ex, ey: Integer;
begin
result := traceRay(ex, ey, x0, y0, x1, y1, tagmask);
end;
// you are not supposed to understand this
function TBodyGridBase.traceRay (out ex, ey: Integer; const ax0, ay0, ax1, ay1: Integer; tagmask: Integer=-1): ITP;
var
lw: 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
lastDistSq := distanceSq(ax0, ay0, ax1, ay1)+1;
{$IF DEFINED(D2F_DEBUG)}
//if assigned(dbgRayTraceTileHitCB) then e_LogWritefln('*** traceRay: (%s,%s)-(%s,%s)', [x0, y0, x1, y1]);
{$ENDIF}
// 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;
repeat
lw.getXY(cx, cy);
{$IF DEFINED(D2F_DEBUG)}
if assigned(dbgRayTraceTileHitCB) then dbgRayTraceTileHitCB(cx+mMinX, cy+mMinY);
{$ENDIF}
// 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
// get adjusted proxy coords
px0 := px.mX-minx;
py0 := px.mY-miny;
px1 := px0+px.mWidth-1;
py1 := py0+px.mHeight-1;
{$IF DEFINED(D2F_DEBUG)}
//if assigned(dbgRayTraceTileHitCB) then e_LogWritefln(' cxy=(%s,%s); pan=(%s,%s)-(%s,%s)', [cx, cy, px0, py0, px1, py1]);
{$ENDIF}
// 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;
{$IF DEFINED(D2F_DEBUG)}
if assigned(dbgRayTraceTileHitCB) then e_LogWriteln(' INSIDE!');
{$ENDIF}
exit;
end;
// do line-vs-aabb test
if lineAABBIntersects(x0, y0, x1, y1, px0, py0, px1-px0+1, py1-py0+1, hx, hy) then
begin
// hit detected
distSq := distanceSq(x0, y0, hx, hy);
{$IF DEFINED(D2F_DEBUG)}
//if assigned(dbgRayTraceTileHitCB) then e_LogWritefln(' hit=(%s,%s); distSq=%s; lastDistSq=%s', [hx, hy, distSq, lastDistSq]);
{$ENDIF}
if (distSq < lastDistSq) then
begin
lastDistSq := distSq;
ex := hx+minx;
ey := hy+miny;
result := px.mObj;
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 exit;
firstCell := false;
// move to next tile
until lw.stepToNextTile();
end;
end.