void Download()
{
// Manage downloads
int activeDownloads = 0;
for (int k = 0; k < concurrentDownloads; k++)
{
if (downloads [k].busy)
{
CustomWWW www = downloads [k].www;
if (www.isDone)
{
bool good = string.IsNullOrEmpty(www.error);
// Check texture consistency
if (good)
{
Texture2D tex = www.textureNonReadable;
if (tex == null)
{
good = false;
}
else if (tex.width < 16)
{
good = false;
DestroyImmediate(tex);
}
}
if (good)
{
// save to resources
bytesDownloaded += www.bytes.Length;
File.WriteAllBytes(downloads [k].path, www.bytes);
downloadedTilesCount++;
downloadedTilesSize += bytesDownloaded;
downloads [k].busy = false;
}
else
{
if (downloads [k].retries < 3)
{
downloads [k].retries++;
Debug.LogError("Retrying " + downloads [k].retries + " times due error on tile XYZ = " + downloads [k].x + "/" + downloads [k].y + "/" + downloads [k].zoomLevel + " : " + www.error);
downloads [k].www = new CustomWWW(www.url);
activeDownloads++;
}
else
{
downloads [k].busy = false;
}
}
www.Dispose();
}
else
{
activeDownloads++;
}
}
}
int iterations = 0;
for (int k = 0; k < concurrentDownloads; k++)
{
if (!downloads [k].busy)
{
if (activeDownloads >= concurrentDownloads)
{
return;
}
// Get next tile
bool remainingTiles = GetNextTile();
// Have we finished?
if (!remainingTiles)
{
if (activeDownloads == 0)
{
StopOperation();
}
return;
}
ti.x = x;
ti.y = y;
ti.zoomLevel = zoomLevel;
string url = map.GetTileURL(map.tileServer, ti);
// Is current tile already in Resources path?
string tilePath = map.GetTileResourcePath(x, y, zoomLevel);
if (File.Exists(tilePath))
{
if (++iterations < 128)
{
k--;
}
}
else
{
downloads [k].busy = true;
downloads [k].retries = 0;
downloads [k].x = x;
downloads [k].y = y;
downloads [k].zoomLevel = zoomLevel;
downloads [k].path = tilePath;
downloads [k].www = new CustomWWW(url);
activeDownloads++;
}
}
}
}
