fCollision_Grid_BakeLayers

/// @func fCollision_Grid_BakeLayers

var _tileLayers = fEditor_Layer_Get_TileLayerList();
var _grid = oLayerController.collisionGrid;
ds_grid_clear(_grid,0);

for (var l = 0; l < ds_list_size(_tileLayers); l++){
    var _layer = _tileLayers[| l];
    if (!fEditor_Layer_Get_IsLayerCollision(_layer)){
        continue;
    }

    var _tilemapList = fEditor_Layer_Get_ElementsOfType(_collisionLayerMap,layerelementtype_tilemap);

    for (var tm = 0; tm < ds_list_size(_tilemapList); tm++){
        var _tilemap = _tilemapList[| tm];
        var _tilemapDims =  [
                                    tilemap_get_x(_tilemap),
                                    tilemap_get_y(_tilemap),
                                    tilemap_get_width(_tilemap),
                                    tilemap_get_height(_tilemap)];

        var _tilesProcessed = 0;
        var _tilesTotal = fEditor_Layer_Tilemap_NumTiles_Get(_tilemap);
        if (_tilesTotal == 0){
                continue;
        }
        if (_tilemapDims[rectWH.w] % TILE_SIZE != 0 || _tilemapDims[rectWH.h] % TILE_SIZE != 0){
                fTrace("[WARN] fCollision_Grid_BakeLayers: Tilemap offset is not divisible by tile size!");
        }
        if (_tilemapDims[rectWH.x] + _tilemapDims[rectWH.w] >= ds_grid_width(oLayerController.collisionGrid) ||
             _tilemapDims[rectWH.y] + _tilemapDims[rectWH.h] >= ds_grid_height(oLayerController.collisioNGrid)){
                fTrace("[WARN] fCollision_Grid_BakeLayers: Tilemap size exceeds collision grid size for some reason!");
        }

        var _gridOffsetX = _tilemapDims[rectWH.x];
        var _gridOffsetY = _tilemapDims[rectWH.y];

        for (var ty = 0; ty < _tilemapDims[rectWH.h]; ty++){
            if (_tilesProcessed == _tilesTotal){
                break;
            }
            for (var tx = 0; tx < _tilemapDims[rectWH.w]; tx++){
                if (_tilesProcessed == _tilesTotal){
                    break;
                }
                var _cellHasTile = !tilemap_tile_empty(_tilemap,tx,ty);
                _grid[# tx + _gridOffsetX, ty + _gridOffsetY] |= _cellHasTile;
                _tilesProcessed += _cellHasTile;
            }
        }
    }
    ds_list_destroy(_tilemapList);
}