/// <summary>
/// 开始加载
/// </summary>
private IEnumerator Load(LoadRequest request)
{
Texture2D[] textures = new Texture2D[m_FilePathStrs.Length];
for (int i = 0; i < m_FilePathStrs.Length; i++)
{
var file = string.Format(m_FilePathStrs[i], request.PageX >> request.MipLevel, request.PageY >> request.MipLevel, request.MipLevel);
var www = UnityWebRequestTexture.GetTexture(file);
yield return(www.SendWebRequest());
if (!www.isNetworkError && !www.isHttpError)
{
textures[i] = ((DownloadHandlerTexture)www.downloadHandler).texture;
Stat.TotalDownladSize += (float)www.downloadedBytes / 1024.0f / 1024.0f;
}
else
{
Debug.LogWarningFormat("Load file({0}) failed: {1}", file, www.error);
Stat.TotalFailCount++;
}
}
m_RuningRequests.Remove(request);
OnLoadComplete?.Invoke(request, textures);
}
/// <summary>
/// 新建加载请求
/// </summary>
public LoadRequest Request(int x, int y, int mip)
{
// 是否已经在请求队列中
foreach (var r in m_RuningRequests)
{
if (r.PageX == x && r.PageY == y && r.MipLevel == mip)
{
return(null);
}
}
foreach (var r in m_PendingRequests)
{
if (r.PageX == x && r.PageY == y && r.MipLevel == mip)
{
return(null);
}
}
// 加入待处理列表
var request = new LoadRequest(x, y, mip);
m_PendingRequests.Add(request);
Stat.TotalRequestCount++;
return(request);
}
/// <summary>
/// 加载完成回调
/// </summary>
private void OnLoadComplete(LoadRequest request, Texture2D[] textures)
{
// 找到对应页表
var node = m_PageTable.Get(request.PageX, request.PageY, request.MipLevel);
if (node == null || node.Payload.LoadRequest != request)
{
return;
}
node.Payload.LoadRequest = null;
var id = m_TileTexture.RequestTile();
m_TileTexture.UpdateTile(id, textures);
node.Payload.TileIndex = id;
m_ActivePages[id] = node;
}