Implemented VmaBlockMetadata_Linear::GetUnusedRangeSizeMax.
diff --git a/src/vk_mem_alloc.h b/src/vk_mem_alloc.h
index 1d3d2d9..70ce4f7 100644
--- a/src/vk_mem_alloc.h
+++ b/src/vk_mem_alloc.h
@@ -7403,8 +7403,66 @@
VkDeviceSize VmaBlockMetadata_Linear::GetUnusedRangeSizeMax() const
{
- // TODO
- return GetSize();
+ const VkDeviceSize size = GetSize();
+
+ /*
+ We don't consider gaps inside allocation vectors with freed allocations because
+ they are not suitable for reuse in linear allocator. We consider only space that
+ is available for new allocations.
+ */
+ if(IsEmpty())
+ {
+ return size;
+ }
+
+ const SuballocationVectorType& suballocations1st = AccessSuballocations1st();
+
+ switch(m_2ndVectorMode)
+ {
+ case SECOND_VECTOR_EMPTY:
+ /*
+ Available space is after end of 1st, as well as before beginning of 1st (which
+ whould make it a ring buffer).
+ */
+ {
+ const size_t suballocations1stCount = suballocations1st.size();
+ VMA_ASSERT(suballocations1stCount > m_1stNullItemsBeginCount);
+ const VmaSuballocation& firstSuballoc = suballocations1st[m_1stNullItemsBeginCount];
+ const VmaSuballocation& lastSuballoc = suballocations1st[suballocations1stCount - 1];
+ return VMA_MAX(
+ firstSuballoc.offset,
+ size - (lastSuballoc.offset + lastSuballoc.size));
+ }
+ break;
+
+ case SECOND_VECTOR_RING_BUFFER:
+ /*
+ Available space is only between end of 2nd and beginning of 1st.
+ */
+ {
+ const SuballocationVectorType& suballocations2nd = AccessSuballocations2nd();
+ const VmaSuballocation& lastSuballoc2nd = suballocations2nd.back();
+ const VmaSuballocation& firstSuballoc1st = suballocations1st[m_1stNullItemsBeginCount];
+ return firstSuballoc1st.offset - (lastSuballoc2nd.offset + lastSuballoc2nd.size);
+ }
+ break;
+
+ case SECOND_VECTOR_DOUBLE_STACK:
+ /*
+ Available space is only between end of 1st and top of 2nd.
+ */
+ {
+ const SuballocationVectorType& suballocations2nd = AccessSuballocations2nd();
+ const VmaSuballocation& topSuballoc2nd = suballocations2nd.back();
+ const VmaSuballocation& lastSuballoc1st = suballocations1st.back();
+ return topSuballoc2nd.offset - (lastSuballoc1st.offset + lastSuballoc1st.size);
+ }
+ break;
+
+ default:
+ VMA_ASSERT(0);
+ return 0;
+ }
}
void VmaBlockMetadata_Linear::CalcAllocationStatInfo(VmaStatInfo& outInfo) const
