public void OnUpdate(List <SceneNode> visibleSceneNodes, string parentName, Transform parent, Vector3 center)
{
// load
foreach (SceneNode sn in visibleSceneNodes)
{
if (!loadedSceneNodes.ContainsKey(sn))
{
SceneNodeAssets sna = LoadSceneNode(sn, parentName, parent);
loadedSceneNodes[sn] = sna;
}
}
// unload
needRemoveSceneNodes.Clear();
foreach (KeyValuePair <SceneNode, SceneNodeAssets> kv in loadedSceneNodes)
{
Vector2 v = new Vector2(center.x - kv.Key.position.x, center.z - kv.Key.position.z);
if (v.sqrMagnitude > unloadDistance * unloadDistance)
{
needRemoveSceneNodes.Add(kv.Key, kv.Value);
}
}
foreach (KeyValuePair <SceneNode, SceneNodeAssets> kv in needRemoveSceneNodes)
{
loadedSceneNodes.Remove(kv.Key);
UnloadSceneNode(kv.Value);
}
}
void UnloadSceneNode(SceneNodeAssets sna)
{
if (!sna.loaded)
{
return;
}
Destroy(sna.gameObject);
DecreaseAssetsRefs(sna);
sna.loaded = false;
}
void DecreaseAssetsRefs(SceneNodeAssets sna)
{
//check unload mesh
foreach (Mesh mesh in sna.meshs)
{
if (meshRefs.ContainsKey(mesh))
{
meshRefs[mesh]--;
if (meshRefs[mesh] <= 0)// need unload
{
meshRefs.Remove(mesh);
Resources.UnloadAsset(mesh);
}
}
}
foreach (Material mat in sna.materials)
{
if (materialRefs.ContainsKey(mat))
{
materialRefs[mat]--;
if (materialRefs[mat] <= 0)
{
materialRefs.Remove(mat);
Resources.UnloadAsset(mat);
}
}
}
// check unload texture
foreach (Texture tex in sna.textures)
{
if (textureRefs.ContainsKey(tex))
{
textureRefs[tex]--;
if (textureRefs[tex] <= 0)// need unload
{
textureRefs.Remove(tex);
Resources.UnloadAsset(tex);
}
}
}
}
SceneNodeAssets LoadSceneNode(SceneNode sn, string parentName, Transform parent)
{
UnityEngine.Object obj = Resources.Load("QuadTree/" + parentName + "/" + sn.prefabName);
if (obj == null)
{
Debug.LogError(sn.prefabName + "isn't exist!");
return(null);
}
GameObject go = GameObject.Instantiate(obj) as GameObject;
go.transform.parent = parent;
SceneNodeAssets sna = go.AddComponent <SceneNodeAssets>();
IncreaseAssetsRefs(sna);
sna.loaded = true;
return(sna);
}
void IncreaseAssetsRefs(SceneNodeAssets sna)
{
foreach (Mesh mesh in sna.meshs)
{
if (meshRefs.ContainsKey(mesh))
{
meshRefs[mesh]++;
}
else
{
meshRefs[mesh] = 1;
}
}
foreach (Material mat in sna.materials)
{
if (materialRefs.ContainsKey(mat))
{
materialRefs[mat]++;
}
else
{
materialRefs[mat] = 1;
}
}
foreach (Texture tex in sna.textures)
{
if (textureRefs.ContainsKey(tex))
{
textureRefs[tex]++;
}
else
{
textureRefs[tex] = 1;
}
}
}
