var TileSize = 16;
var pX = argument0;
var pY = argument1;
var layer_id = layer_tilemap_get_id(layer_get_id(argument2));

var CollideLeft = VelocityX < 0 && (tilemap_get_at_pixel(layer_id, bbox_left, bbox_top) ||
                                    tilemap_get_at_pixel(layer_id, bbox_left, pY) ||
                                    tilemap_get_at_pixel(layer_id, bbox_left, bbox_bottom));

var CollideRight = VelocityX > 0 && (tilemap_get_at_pixel(layer_id, bbox_right, bbox_top) ||
                                    tilemap_get_at_pixel(layer_id, bbox_right, pY) ||
                                    tilemap_get_at_pixel(layer_id, bbox_right, bbox_bottom));

if(CollideLeft || CollideRight)
{
    var col = floor(bbox_left / TileSize);
    x = col * TileSize;
}

var CollideTop = VelocityY < 0 && (tilemap_get_at_pixel(layer_id, bbox_top, bbox_left) ||
                                    tilemap_get_at_pixel(layer_id, bbox_top, pX) ||
                                    tilemap_get_at_pixel(layer_id, bbox_top, bbox_right));

var CollideBottom = VelocityY > 0 && (tilemap_get_at_pixel(layer_id, bbox_bottom, bbox_left) ||
                                    tilemap_get_at_pixel(layer_id, bbox_bottom, pX) ||
                                    tilemap_get_at_pixel(layer_id, bbox_bottom, bbox_right));

if(CollideTop || CollideBottom)
{
    var lig = floor(bbox_top / TileSize);
    y = lig * TileSize;
}