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Added support for VMA_ALLOCATION_CREATE_PERSISTENT_MAP_BIT without HOST_VISIBLE. Improved empty block heuristics.

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Adam Sawicki 2017-10-02 14:28:51 +02:00
parent 951f66a841
commit 1bb85fa719
3 changed files with 116 additions and 81 deletions
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@ -203,7 +203,8 @@ Functions</h2></td></tr>
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<tr><td class="fieldname"><a id="ggad9889c10c798b040d59c92f257cae597ae443691ef3d077c0dc3de5576ac4c312"></a>VMA_ALLOCATION_CREATE_PERSISTENT_MAP_BIT&#160;</td><td class="fielddoc"><p>Set this flag to use a memory that will be persistently mapped and retrieve pointer to it. </p>
<p>Pointer to mapped memory will be returned through <a class="el" href="struct_vma_allocation_info.html#a5eeffbe2d2f30f53370ff14aefbadbe2" title="Pointer to the beginning of this allocation as mapped data. Null if this alloaction is not persistent...">VmaAllocationInfo::pMappedData</a>. You cannot map the memory on your own as multiple mappings of a single <code>VkDeviceMemory</code> are illegal.</p>
<p>If <a class="el" href="struct_vma_allocation_create_info.html#a6272c0555cfd1fe28bff1afeb6190150" title="Pool that this allocation should be created in. ">VmaAllocationCreateInfo::pool</a> is not null, usage of this flag must match usage of flag <code>VMA_POOL_CREATE_PERSISTENT_MAP_BIT</code> used during pool creation. </p>
<p>If <a class="el" href="struct_vma_allocation_create_info.html#a6272c0555cfd1fe28bff1afeb6190150" title="Pool that this allocation should be created in. ">VmaAllocationCreateInfo::pool</a> is not null, usage of this flag must match usage of flag <code>VMA_POOL_CREATE_PERSISTENT_MAP_BIT</code> used during pool creation.</p>
<p>Is it valid to use this flag for allocation made from memory type that is not <code>HOST_VISIBLE</code>. This flag is then ignored and memory is not mapped. This is useful if you need an allocation that is efficient to use on GPU (<code>DEVICE_LOCAL</code>) and still want to map it directly if possible on platforms that support it (e.g. Intel GPU). </p>
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<tr><td class="fieldname"><a id="ggad9889c10c798b040d59c92f257cae597a5f436af6c8fe8540573a6d22627a6fd2"></a>VMA_ALLOCATION_CREATE_CAN_BECOME_LOST_BIT&#160;</td><td class="fielddoc"><p>Allocation created with this flag can become lost as a result of another allocation with <code>VMA_ALLOCATION_CREATE_CAN_MAKE_OTHER_LOST_BIT</code> flag, so you must check it before use.</p>
<p>To check if allocation is not lost, call <a class="el" href="group__layer2.html#ga86dd08aba8633bfa4ad0df2e76481d8b" title="Returns current information about specified allocation. ">vmaGetAllocationInfo()</a> and check if <a class="el" href="struct_vma_allocation_info.html#ae0bfb7dfdf79a76ffefc9a94677a2f67" title="Handle to Vulkan memory object. ">VmaAllocationInfo::deviceMemory</a> is not <code>VK_NULL_HANDLE</code>.</p>