public void Free(MemoryNode node)
{
Debug.Assert(!node.IsUsed);
var idx = _nodes.IndexOf(node);
if (idx != 0)
{
var before = _nodes[idx - 1];
if (!before.IsUsed)
{
before.Size += node.Size;
_nodes.RemoveAt(idx);
idx--;
node = _nodes[idx];
}
}
if (idx != _nodes.Count - 1)
{
var after = _nodes[idx + 1];
if (!after.IsUsed)
{
node.Size += after.Size;
_nodes.RemoveAt(idx + 1);
}
}
}
public MemoryNode Allocate(uint size)
{
size = Align(size);
Reserve(size);
var firstFreeIdx = _nodes.FindLastIndex(o => !o.IsUsed && o.Size >= size);
Debug.Assert(firstFreeIdx != -1);
var firstFree = _nodes[firstFreeIdx];
MemoryNode node;
if (firstFree.Size == size)
{
firstFree.AddRef();
node = firstFree;
}
else
{
firstFree.Size -= size;
var newNode = new MemoryNode(this)
{
Start = firstFree.Start + firstFree.Size,
Size = size
};
newNode.AddRef();
_nodes.Insert(firstFreeIdx + 1, newNode);
node = newNode;
}
return(node);
}
public MemoryAllocation(MemoryNode memoryNode, uint offset, uint size)
{
Node = memoryNode;
Offset = offset;
Size = size;
if (Offset + Size > Node.Size)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
}
public MemoryNode Allocate(uint size)
{
var firstFreeIdx = _nodes.FindLastIndex(o => !o.IsUsed && o.Size >= size);
if (firstFreeIdx == -1)
throw new InvalidOperationException("KPU ran out of memory.");
var firstFree = _nodes[firstFreeIdx];
MemoryNode node;
if (firstFree.Size == size)
{
firstFree.AddRef();
node = firstFree;
}
else
{
if (_findFromLast)
{
firstFree.Size -= size;
var newNode = new MemoryNode(this)
{
Start = firstFree.Start + firstFree.Size,
Size = size
};
newNode.AddRef();
_nodes.Insert(firstFreeIdx + 1, newNode);
node = newNode;
}
else
{
var newNode = new MemoryNode(this)
{
Start = firstFree.Start,
Size = size
};
newNode.AddRef();
firstFree.Start += size;
firstFree.Size -= size;
_nodes.Insert(firstFreeIdx, newNode);
node = newNode;
}
_findFromLast = !_findFromLast;
}
MaxStart = Math.Min(node.Start, MaxStart);
return node;
}
public MemoryAllocation(MemoryNode memoryNode)
{
Node = memoryNode;
Size = memoryNode.Size;
}
