public void BeginFrame(bool clear = false)
{
if (clear)
{
_slots.Clear();
}
_map = _gd.Map(_stagingTexture, _mapMode);
_textureMapped = true;
_firstDirtySlot = uint.MaxValue;
_lastDirtySlot = uint.MinValue;
}
/// <summary>
/// Add index of the image to queue list
/// </summary>
/// <param name="index">Current index of image list</param>
private void UpdateQueueList(int index)
{
// check valid index
if (index < 0 || index >= ImgList.Count)
{
return;
}
var list = new HashSet <int>
{
index
};
var maxCachedItems = (MaxQueue * 2) + 1;
var iRight = index;
var iLeft = index;
// add index in the range in order: index -> right -> left -> ...
for (var i = 0; list.Count < maxCachedItems && list.Count < ImgList.Count; i++)
{
// if i is even number
if ((i & 1) == 0)
{
// add right item: [index + 1; ...; to]
iRight++;
if (iRight < ImgList.Count)
{
list.Add(iRight);
}
else
{
list.Add(iRight - ImgList.Count);
}
}
// if i is odd number
else
{
// add left item: [index - 1; ...; from]
iLeft--;
if (iLeft >= 0)
{
list.Add(iLeft);
}
else
{
list.Add(ImgList.Count + iLeft);
}
}
}
// release the resources
foreach (var indexItem in FreeList)
{
if (!list.Contains(indexItem) && indexItem >= 0 && indexItem < ImgList.Count)
{
ImgList[indexItem].Dispose();
}
}
// update new index of free list
FreeList.Clear();
FreeList.AddRange(list);
// update queue list
QueuedList.Clear();
QueuedList.AddRange(list);
}