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Written documentation for API of the virtual allocator

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Regenerated the documentation.
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Adam Sawicki 2021-10-28 17:36:41 +02:00
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<p >You can create an allocation that is already in lost state from the beginning using function <a class="el" href="vk__mem__alloc_8h.html#ae5c9657d9e94756269145b01c05d16f1" title="Creates new allocation that is in lost state from the beginning.">vmaCreateLostAllocation()</a>. It may be useful if you need a "dummy" allocation that is not null.</p>
<p >You can call function <a class="el" href="vk__mem__alloc_8h.html#a736bd6cbda886f36c891727e73bd4024" title="Marks all allocations in given pool as lost if they are not used in current frame or VmaPoolCreateInf...">vmaMakePoolAllocationsLost()</a> to set all eligible allocations in a specified custom pool to lost state. Allocations that have been "touched" in current frame or <a class="el" href="struct_vma_pool_create_info.html#a9437e43ffbb644dbbf7fc4e50cfad6aa" title="Maximum number of additional frames that are in use at the same time as current frame.">VmaPoolCreateInfo::frameInUseCount</a> frames back cannot become lost.</p>
<p ><b>Q: Can I touch allocation that cannot become lost?</b></p>
<p >Yes, although it has no visible effect. Calls to <a class="el" href="vk__mem__alloc_8h.html#a86dd08aba8633bfa4ad0df2e76481d8b" title="Returns current information about specified allocation and atomically marks it as used in current fra...">vmaGetAllocationInfo()</a> and <a class="el" href="vk__mem__alloc_8h.html#a43d8ba9673c846f049089a5029d5c73a" title="Returns VK_TRUE if allocation is not lost and atomically marks it as used in current frame.">vmaTouchAllocation()</a> update last use frame index also for allocations that cannot become lost, but the only way to observe it is to dump internal allocator state using <a class="el" href="vk__mem__alloc_8h.html#aa4fee7eb5253377599ef4fd38c93c2a0" title="Builds and returns statistics as string in JSON format.">vmaBuildStatsString()</a>. You can use this feature for debugging purposes to explicitly mark allocations that you use in current frame and then analyze JSON dump to see for how long each allocation stays unused. </p>
<p >Yes, although it has no visible effect. Calls to <a class="el" href="vk__mem__alloc_8h.html#a86dd08aba8633bfa4ad0df2e76481d8b" title="Returns current information about specified allocation and atomically marks it as used in current fra...">vmaGetAllocationInfo()</a> and <a class="el" href="vk__mem__alloc_8h.html#a43d8ba9673c846f049089a5029d5c73a" title="Returns VK_TRUE if allocation is not lost and atomically marks it as used in current frame.">vmaTouchAllocation()</a> update last use frame index also for allocations that cannot become lost, but the only way to observe it is to dump internal allocator state using <a class="el" href="vk__mem__alloc_8h.html#aa4fee7eb5253377599ef4fd38c93c2a0" title="Builds and returns statistics as a null-terminated string in JSON format.">vmaBuildStatsString()</a>. You can use this feature for debugging purposes to explicitly mark allocations that you use in current frame and then analyze JSON dump to see for how long each allocation stays unused. </p>
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