private void Reset()
{
if (m_OwnerClipper == null)
{
return;
}
GameObject.Destroy(m_OwnerClipper);
m_OwnerClipper = null;
}
void Start()
{
if (m_UseChilds)
{
Renderer[] rs = GetComponentsInChildren <Renderer> (true);
if (m_GPUInstancingList == null)
{
m_GPUInstancingList = new List <Renderer> (rs.Length);
}
else
{
m_GPUInstancingList.Clear();
}
m_GPUInstancingList.AddRange(rs);
}
if (m_GPUInstancingList != null && m_GPUInstancingList.Count > 0)
{
Camera cam = m_TargetCamera;
if (cam == null)
{
cam = Camera.main;
}
if (cam == null)
{
return;
}
KdTreeCameraClipper clipper = cam.GetComponent <KdTreeCameraClipper> ();
if (clipper == null)
{
clipper = cam.gameObject.AddComponent <KdTreeCameraClipper> ();
clipper.AutoSetVisible = m_GroupType == GPUInstancingGroupType.GroupAutoVisible;
clipper.OpenGPUInstancing = m_GroupType == GPUInstancingGroupType.GroupGPUInstancing;
clipper.m_AspectScale = 2.0f;
clipper.PerMaxVisbileCount = 500;
clipper.m_UseThread = true;
m_OwnerClipper = clipper;
}
else
{
clipper.Clear();
}
clipper.ReBuild(m_GPUInstancingList);
}
}
// 进入场景只Build一次，一个场景Build一次，频率还好, 内部代码有GC
public void Build(bool isUseThread = true)
{
Reset();
if (m_Clipper != null)
{
int cnt = m_Clipper.ObjectsCount;
if (cnt <= 0)
{
return;
}
Action <Vector3[]> action = (Vector3[] arr) => {
int idx = 0;
bool isSet = false;
if (m_KdTreeObjList == null)
{
m_KdTreeObjList = new List <KdTreeObj>(m_Clipper.ObjectsCount);
}
else
{
m_KdTreeObjList.Clear();
m_KdTreeObjList.Capacity = m_Clipper.ObjectsCount;
}
m_Clipper.ForEachObjects(
(Renderer render) =>
{
Vector3 pos = render.transform.position;
arr[idx] = pos;
++idx;
isSet = true;
BoundingSphere boundingSpere = KdTreeCameraClipper.GetBoundingSphere(render);
KdTreeObj obj = new KdTreeObj();
obj.InstanceId = render.GetInstanceID();
obj.boundSphere = boundingSpere;
m_KdTreeObjList.Add(obj);
}
);
if (isSet)
{
m_KdTree = new KDTree.KDTree(arr, 32, false);
m_KdTreeStatus = KdTreeStatus.WaitRebuild;
m_UseThread = isUseThread;
UpdateClipper();
CreateThread();
}
};
if (m_VecArr == null)
{
m_VecArr = new Vector3[cnt];
action(m_VecArr);
}
else if (cnt > m_VecArr.Length)
{
Array.Resize(ref m_VecArr, cnt);
action(m_VecArr);
}
else
{
UnsafeUtil.Vector3HackArraySizeCall(m_VecArr, cnt, action);
}
}
}