public T *Alloc()
{
T * result;
Item *pItem;
for (nuint i = m_ItemBlocks.size(); unchecked (i-- != 0);)
{
ItemBlock *block = m_ItemBlocks[i];
// This block has some free items: Use first one.
if (block->FirstFreeIndex != UINT32_MAX)
{
pItem = &block->pItems[block->FirstFreeIndex];
block->FirstFreeIndex = pItem->NextFreeIndex;
result = (T *)&pItem->Value;
return(result);
}
}
// No block has free item: Create new one and use it.
ItemBlock *newBlock = CreateNewBlock();
pItem = &newBlock->pItems[0];
newBlock->FirstFreeIndex = pItem->NextFreeIndex;
result = (T *)&pItem->Value;
return(result);
}
public void Free(T *ptr)
{
// Search all memory blocks to find ptr.
for (nuint i = m_ItemBlocks.size(); unchecked (i-- != 0);)
{
ItemBlock *block = m_ItemBlocks[i];
Item *pItemPtr;
memcpy(&pItemPtr, &ptr, (nuint)sizeof(Item *));
// Check if pItemPtr is in address range of this block.
if ((pItemPtr >= block->pItems) && (pItemPtr < block->pItems + block->Capacity))
{
ptr->Dispose(); // Explicit destructor call.
uint index = (uint)(pItemPtr - block->pItems);
pItemPtr->NextFreeIndex = block->FirstFreeIndex;
block->FirstFreeIndex = index;
return;
}
}
D3D12MA_ASSERT(false); // Pointer doesn't belong to this memory pool
}
