/// <summary>
/// 填加一个裁剪请求
/// </summary>
/// <param name="_cullingObject"></param>
public void AddRequest(IViewCullingObject _cullingObject)
{
//检查当前的数量是否已经达到了最大值
//如果达到了，那么就不允许继续添加
if (currentRequestingCount >= maxSize)
{
this.Expand(Mathf.Max(1, maxSize / 2));
this.AddRequest(_cullingObject);
Debug.LogWarning($"{System.DateTime.Now.ToShortTimeString()} : Culling系统超出了范围，已增加大小至{Mathf.Max(1, maxSize)}。");
}
else
{
//currentRequestingCount其实就是最后一个可用的Index
//把Object添加到追踪队列里面
//并且赋值Index以供记录
viewCullingObjects[currentRequestingCount] = _cullingObject;
_cullingObject.index = currentRequestingCount;
//将BoundingSpheres这边的数据与之同步
boundingSpheres[currentRequestingCount].position = _cullingObject.position;
boundingSpheres[currentRequestingCount].radius = _cullingObject.radium;
//增加数量，并且同步设置CullingGroup的数量
++currentRequestingCount;
cullingGroup.SetBoundingSphereCount(currentRequestingCount);
}
}
/// <summary>
/// 更新裁剪数据
/// </summary>
/// <param name="_cullingObject"></param>
public void UpdateRequest(IViewCullingObject _cullingObject)
{
var index = _cullingObject.index;
//如果index为-1，说明不在队列内
if (index != -1)
{
//更新对应的BoundingSpheres的位置和半径
boundingSpheres[index].position = _cullingObject.position;
boundingSpheres[index].radius = _cullingObject.radium;
}
}
/// <summary>
/// 移除一个裁剪请求
/// </summary>
/// <param name="_cullingObject"></param>
public void RemoveRequest(IViewCullingObject _cullingObject)
{
var index = _cullingObject.index;
//如果Index为-1，说明根本就不在队列中
if (index != -1)
{
//从CullingGroup中移除该元素
cullingGroup.EraseSwapBack(index);
//减少数量，并且同步设置CullingGroup的数量
--currentRequestingCount;
cullingGroup.SetBoundingSphereCount(currentRequestingCount);
//CullingGroup中是将最后一个元素移动到当前元素进行替换的
//因此ViewCullingObjects这边也采取相同的措施
//并更新被替换的Object的Index
viewCullingObjects[index] = viewCullingObjects[currentRequestingCount];
viewCullingObjects[index].index = index;
//将申请者的Index设置为-1，表示其已经不属于列表内
_cullingObject.index = -1;
}
}
