/// <summary>Releases given suballocation, making it free. Merges it with adjacent free suballocations if applicable. Returns iterator to new free suballocation at this place.</summary>
public D3D12MA_List <D3D12MA_Suballocation> .iterator FreeSuballocation(D3D12MA_List <D3D12MA_Suballocation> .iterator suballocItem)
{
// Change this suballocation to be marked as free.
D3D12MA_Suballocation *suballoc = suballocItem.Get();
suballoc->type = D3D12MA_SUBALLOCATION_TYPE_FREE;
suballoc->userData = null;
// Update totals.
++m_FreeCount;
m_SumFreeSize += suballoc->size;
// Merge with previous and/or next suballocation if it's also free.
bool mergeWithNext = false;
bool mergeWithPrev = false;
D3D12MA_List <D3D12MA_Suballocation> .iterator nextItem = suballocItem;
nextItem = nextItem.MoveNext();
if ((nextItem != m_Suballocations.end()) && (nextItem.Get()->type == D3D12MA_SUBALLOCATION_TYPE_FREE))
{
mergeWithNext = true;
}
D3D12MA_List <D3D12MA_Suballocation> .iterator prevItem = suballocItem;
if (suballocItem != m_Suballocations.begin())
{
prevItem = prevItem.MoveBack();
if (prevItem.Get()->type == D3D12MA_SUBALLOCATION_TYPE_FREE)
{
mergeWithPrev = true;
}
}
if (mergeWithNext)
{
UnregisterFreeSuballocation(nextItem);
MergeFreeWithNext(suballocItem);
}
if (mergeWithPrev)
{
UnregisterFreeSuballocation(prevItem);
MergeFreeWithNext(prevItem);
RegisterFreeSuballocation(prevItem);
return(prevItem);
}
else
{
RegisterFreeSuballocation(suballocItem);
return(suballocItem);
}
}
/// <summary>Given free suballocation, it merges it with following one, which must also be free.</summary>
public void MergeFreeWithNext(D3D12MA_List <D3D12MA_Suballocation> .iterator item)
{
D3D12MA_ASSERT((D3D12MA_DEBUG_LEVEL > 0) && (item != m_Suballocations.end()));
D3D12MA_ASSERT((D3D12MA_DEBUG_LEVEL > 0) && (item.Get()->type == D3D12MA_SUBALLOCATION_TYPE_FREE));
D3D12MA_List <D3D12MA_Suballocation> .iterator nextItem = item;
nextItem = nextItem.MoveNext();
D3D12MA_ASSERT((D3D12MA_DEBUG_LEVEL > 0) && (nextItem != m_Suballocations.end()));
D3D12MA_ASSERT((D3D12MA_DEBUG_LEVEL > 0) && (nextItem.Get()->type == D3D12MA_SUBALLOCATION_TYPE_FREE));
item.Get()->size += nextItem.Get()->size;
--m_FreeCount;
m_Suballocations.erase(nextItem);
}