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Improved documentation of vmaMapMemory function

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This commit is contained in:
Adam Sawicki 2021-12-21 16:50:33 +01:00
parent 556834c0b4
commit 6fe7212e73
1 changed files with 6 additions and 3 deletions
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9
include/vk_mem_alloc.h
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@ -1885,9 +1885,12 @@ VMA_CALL_PRE void VMA_CALL_POST vmaGetAllocationMemoryProperties(
Maps memory represented by given allocation to make it accessible to CPU code.
When succeeded, `*ppData` contains pointer to first byte of this memory.
If the allocation is part of bigger `VkDeviceMemory` block, the pointer is
correctly offsetted to the beginning of region assigned to this particular
allocation.
\warning
If the allocation is part of a bigger `VkDeviceMemory` block, returned pointer is
correctly offsetted to the beginning of region assigned to this particular allocation.
Unlike the result of `vkMapMemory`, it points to the allocation, not to the beginning of the whole block.
You should not add VmaAllocationInfo::offset to it!
Mapping is internally reference-counted and synchronized, so despite raw Vulkan
function `vkMapMemory()` cannot be used to map same block of `VkDeviceMemory`