<trclass="memdesc:"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Set of callbacks that the library will call for <code>vkAllocateMemory</code> and <code>vkFreeMemory</code>. <ahref="struct_vma_device_memory_callbacks.html#details">More...</a><br/></td></tr>
<trclass="memdesc:"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Pointers to some Vulkan functions - a subset used by the library. <ahref="struct_vma_vulkan_functions.html#details">More...</a><br/></td></tr>
<trclass="memdesc:"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Description of a Allocator to be created. <ahref="struct_vma_allocator_create_info.html#details">More...</a><br/></td></tr>
<trclass="memdesc:"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Calculated statistics of memory usage in entire allocator. <ahref="struct_vma_stat_info.html#details">More...</a><br/></td></tr>
<trclass="memdesc:"><tdclass="mdescLeft"> </td><tdclass="mdescRight">General statistics from current state of Allocator. <ahref="struct_vma_stats.html#details">More...</a><br/></td></tr>
<trclass="memdesc:"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Describes parameter of created <code>VmaPool</code>. <ahref="struct_vma_pool_create_info.html#details">More...</a><br/></td></tr>
<trclass="memdesc:"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Parameters of <code>VmaAllocation</code> objects, that can be retrieved using function <aclass="el"href="vk__mem__alloc_8h.html#a86dd08aba8633bfa4ad0df2e76481d8b"title="Returns current information about specified allocation. ">vmaGetAllocationInfo()</a>. <ahref="struct_vma_allocation_info.html#details">More...</a><br/></td></tr>
<trclass="memdesc:"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Optional configuration parameters to be passed to function <aclass="el"href="vk__mem__alloc_8h.html#a6aced90fcc7b39882b6654a740a0b9bb"title="Compacts memory by moving allocations. ">vmaDefragment()</a>. <ahref="struct_vma_defragmentation_info.html#details">More...</a><br/></td></tr>
<trclass="memdesc:"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Statistics returned by function <aclass="el"href="vk__mem__alloc_8h.html#a6aced90fcc7b39882b6654a740a0b9bb"title="Compacts memory by moving allocations. ">vmaDefragment()</a>. <ahref="struct_vma_defragmentation_stats.html#details">More...</a><br/></td></tr>
<trclass="memdesc:ab6a6477cda1ce775b30bde96d766203b"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Callback function called after successful vkAllocateMemory. <ahref="#ab6a6477cda1ce775b30bde96d766203b">More...</a><br/></td></tr>
<trclass="memdesc:aef2545dc2e9dd4f29ab9ba6ac6fe2f49"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Callback function called before vkFreeMemory. <ahref="#aef2545dc2e9dd4f29ab9ba6ac6fe2f49">More...</a><br/></td></tr>
<trclass="memdesc:a5e2eb68d727cfd4df25702b027b7aa31"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Set of callbacks that the library will call for <code>vkAllocateMemory</code> and <code>vkFreeMemory</code>. <ahref="#a5e2eb68d727cfd4df25702b027b7aa31">More...</a><br/></td></tr>
<trclass="memdesc:a4ddf381b6ce795bdfbc6c614640b9915"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Flags for created VmaAllocator. <ahref="#a4ddf381b6ce795bdfbc6c614640b9915">More...</a><br/></td></tr>
<trclass="memdesc:a97064a1a271b0061ebfc3a079862d0c5"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Pointers to some Vulkan functions - a subset used by the library. <ahref="#a97064a1a271b0061ebfc3a079862d0c5">More...</a><br/></td></tr>
<trclass="memdesc:ae0f6d1d733dded220d28134da46b4283"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Description of a Allocator to be created. <ahref="#ae0f6d1d733dded220d28134da46b4283">More...</a><br/></td></tr>
<trclass="memdesc:a810b009a788ee8aac72a25b42ffbe31c"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Calculated statistics of memory usage in entire allocator. <ahref="#a810b009a788ee8aac72a25b42ffbe31c">More...</a><br/></td></tr>
<trclass="memdesc:a732be855fb4a7c248e6853d928a729af"><tdclass="mdescLeft"> </td><tdclass="mdescRight">General statistics from current state of Allocator. <ahref="#a732be855fb4a7c248e6853d928a729af">More...</a><br/></td></tr>
<trclass="memdesc:abf6bf6748c7a9fe7ce5b7835c0f56af4"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Flags to be passed as <aclass="el"href="struct_vma_allocation_create_info.html#add09658ac14fe290ace25470ddd6d41b"title="Use VmaAllocationCreateFlagBits enum. ">VmaAllocationCreateInfo::flags</a>. <ahref="#abf6bf6748c7a9fe7ce5b7835c0f56af4">More...</a><br/></td></tr>
<trclass="memdesc:a8f93195158e0e2ac80ca352064e71c1f"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Flags to be passed as <aclass="el"href="struct_vma_pool_create_info.html#a8405139f63d078340ae74513a59f5446"title="Use combination of VmaPoolCreateFlagBits. ">VmaPoolCreateInfo::flags</a>. <ahref="#a8f93195158e0e2ac80ca352064e71c1f">More...</a><br/></td></tr>
<trclass="memdesc:a211706e9348dcee25a843ed4ea69bce7"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Describes parameter of created <code>VmaPool</code>. <ahref="#a211706e9348dcee25a843ed4ea69bce7">More...</a><br/></td></tr>
<trclass="memdesc:a795e6ff02a21d5486c0565f403dd9255"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Parameters of <code>VmaAllocation</code> objects, that can be retrieved using function <aclass="el"href="vk__mem__alloc_8h.html#a86dd08aba8633bfa4ad0df2e76481d8b"title="Returns current information about specified allocation. ">vmaGetAllocationInfo()</a>. <ahref="#a795e6ff02a21d5486c0565f403dd9255">More...</a><br/></td></tr>
<trclass="memdesc:ae67f8573a0cf20f16f0a1eecbca566a0"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Optional configuration parameters to be passed to function <aclass="el"href="vk__mem__alloc_8h.html#a6aced90fcc7b39882b6654a740a0b9bb"title="Compacts memory by moving allocations. ">vmaDefragment()</a>. <ahref="#ae67f8573a0cf20f16f0a1eecbca566a0">More...</a><br/></td></tr>
<trclass="memdesc:ab0f9b06441c840fee560de4a2967f8c9"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Statistics returned by function <aclass="el"href="vk__mem__alloc_8h.html#a6aced90fcc7b39882b6654a740a0b9bb"title="Compacts memory by moving allocations. ">vmaDefragment()</a>. <ahref="#ab0f9b06441c840fee560de4a2967f8c9">More...</a><br/></td></tr>
}<trclass="memdesc:a4f87c9100d154a65a4ad495f7763cf7c"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Flags for created VmaAllocator. <ahref="vk__mem__alloc_8h.html#a4f87c9100d154a65a4ad495f7763cf7c">More...</a><br/></td></tr>
}<trclass="memdesc:ad9889c10c798b040d59c92f257cae597"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Flags to be passed as <aclass="el"href="struct_vma_allocation_create_info.html#add09658ac14fe290ace25470ddd6d41b"title="Use VmaAllocationCreateFlagBits enum. ">VmaAllocationCreateInfo::flags</a>. <ahref="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597">More...</a><br/></td></tr>
}<trclass="memdesc:a9a7c45f9c863695d98c83fa5ac940fe7"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Flags to be passed as <aclass="el"href="struct_vma_pool_create_info.html#a8405139f63d078340ae74513a59f5446"title="Use combination of VmaPoolCreateFlagBits. ">VmaPoolCreateInfo::flags</a>. <ahref="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7">More...</a><br/></td></tr>
<trclass="memdesc:a8701444752eb5de4464adb5a2b514bca"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Given Memory Type Index, returns Property Flags of this memory type. <ahref="#a8701444752eb5de4464adb5a2b514bca">More...</a><br/></td></tr>
<trclass="memdesc:ade56bf8dc9f5a5eaddf5f119ed525236"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Sets index of the current frame. <ahref="#ade56bf8dc9f5a5eaddf5f119ed525236">More...</a><br/></td></tr>
<trclass="memdesc:a333b61c1788cb23559177531e6a93ca3"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Retrieves statistics from current state of the Allocator. <ahref="#a333b61c1788cb23559177531e6a93ca3">More...</a><br/></td></tr>
<trclass="memdesc:aa4fee7eb5253377599ef4fd38c93c2a0"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Builds and returns statistics as string in JSON format. <ahref="#aa4fee7eb5253377599ef4fd38c93c2a0">More...</a><br/></td></tr>
<trclass="memitem:a736bd6cbda886f36c891727e73bd4024"><tdclass="memItemLeft"align="right"valign="top">void </td><tdclass="memItemRight"valign="bottom"><aclass="el"href="vk__mem__alloc_8h.html#a736bd6cbda886f36c891727e73bd4024">vmaMakePoolAllocationsLost</a> (VmaAllocator allocator, VmaPool pool, size_t *pLostAllocationCount)</td></tr>
<trclass="memdesc:a736bd6cbda886f36c891727e73bd4024"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Marks all allocations in given pool as lost if they are not used in current frame or <aclass="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> back from now. <ahref="#a736bd6cbda886f36c891727e73bd4024">More...</a><br/></td></tr>
<trclass="memdesc:a0faa3f9e5fb233d29d1e00390650febb"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Function similar to <aclass="el"href="vk__mem__alloc_8h.html#a7fdf64415b6c3d83c454f28d2c53df7b">vmaAllocateMemoryForBuffer()</a>. <ahref="#a0faa3f9e5fb233d29d1e00390650febb">More...</a><br/></td></tr>
<trclass="memdesc:a11f0fbc034fa81a4efedd73d61ce7568"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Frees memory previously allocated using <aclass="el"href="vk__mem__alloc_8h.html#abf28077dbf82d0908b8acbe8ee8dd9b8"title="General purpose memory allocation. ">vmaAllocateMemory()</a>, <aclass="el"href="vk__mem__alloc_8h.html#a7fdf64415b6c3d83c454f28d2c53df7b">vmaAllocateMemoryForBuffer()</a>, or <aclass="el"href="vk__mem__alloc_8h.html#a0faa3f9e5fb233d29d1e00390650febb"title="Function similar to vmaAllocateMemoryForBuffer(). ">vmaAllocateMemoryForImage()</a>. <ahref="#a11f0fbc034fa81a4efedd73d61ce7568">More...</a><br/></td></tr>
<trclass="memdesc:a86dd08aba8633bfa4ad0df2e76481d8b"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Returns current information about specified allocation. <ahref="#a86dd08aba8633bfa4ad0df2e76481d8b">More...</a><br/></td></tr>
<trclass="memdesc:af9147d31ffc11d62fc187bde283ed14f"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Sets pUserData in given allocation to new value. <ahref="#af9147d31ffc11d62fc187bde283ed14f">More...</a><br/></td></tr>
<trclass="memdesc:ae5c9657d9e94756269145b01c05d16f1"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Creates new allocation that is in lost state from the beginning. <ahref="#ae5c9657d9e94756269145b01c05d16f1">More...</a><br/></td></tr>
<trclass="memdesc:a26b87244491c1fe77f11fe9ab5779c27"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Unmaps persistently mapped memory of types that are <code>HOST_COHERENT</code> and <code>DEVICE_LOCAL</code>. <ahref="#a26b87244491c1fe77f11fe9ab5779c27">More...</a><br/></td></tr>
<trclass="memdesc:a03366170bb8e186605518d2f5d65b85a"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Maps back persistently mapped memory of types that are <code>HOST_COHERENT</code> and <code>DEVICE_LOCAL</code>. <ahref="#a03366170bb8e186605518d2f5d65b85a">More...</a><br/></td></tr>
<trclass="memdesc:a02a94f25679275851a53e82eacbcfc73"><tdclass="mdescLeft"> </td><tdclass="mdescRight">Function similar to <aclass="el"href="vk__mem__alloc_8h.html#ac72ee55598617e8eecca384e746bab51">vmaCreateBuffer()</a>. <ahref="#a02a94f25679275851a53e82eacbcfc73">More...</a><br/></td></tr>
<p>Flags to be passed as <aclass="el"href="struct_vma_allocation_create_info.html#add09658ac14fe290ace25470ddd6d41b"title="Use VmaAllocationCreateFlagBits enum. ">VmaAllocationCreateInfo::flags</a>. </p>
<p>Parameters of <code>VmaAllocation</code> objects, that can be retrieved using function <aclass="el"href="vk__mem__alloc_8h.html#a86dd08aba8633bfa4ad0df2e76481d8b"title="Returns current information about specified allocation. ">vmaGetAllocationInfo()</a>. </p>
<p>Optional configuration parameters to be passed to function <aclass="el"href="vk__mem__alloc_8h.html#a6aced90fcc7b39882b6654a740a0b9bb"title="Compacts memory by moving allocations. ">vmaDefragment()</a>. </p>
<p>Statistics returned by function <aclass="el"href="vk__mem__alloc_8h.html#a6aced90fcc7b39882b6654a740a0b9bb"title="Compacts memory by moving allocations. ">vmaDefragment()</a>. </p>
<p>Set of callbacks that the library will call for <code>vkAllocateMemory</code> and <code>vkFreeMemory</code>. </p>
<p>Provided for informative purpose, e.g. to gather statistics about number of allocations or total amount of memory allocated in Vulkan.</p>
<p>Used in <aclass="el"href="struct_vma_allocator_create_info.html#af1380969b5e1ea4c3184a877892d260e"title="Informative callbacks for vkAllocateMemory, vkFreeMemory. ">VmaAllocatorCreateInfo::pDeviceMemoryCallbacks</a>. </p>
<p>Flags to be passed as <aclass="el"href="struct_vma_pool_create_info.html#a8405139f63d078340ae74513a59f5446"title="Use combination of VmaPoolCreateFlagBits. ">VmaPoolCreateInfo::flags</a>. </p>
<p>Pointers to some Vulkan functions - a subset used by the library. </p>
<p>Used in <aclass="el"href="struct_vma_allocator_create_info.html#a3dc197be3227da7338b1643f70db36bd"title="Pointers to Vulkan functions. Can be null if you leave define VMA_STATIC_VULKAN_FUNCTIONS 1...">VmaAllocatorCreateInfo::pVulkanFunctions</a>. </p>
</div>
</div>
<h2class="groupheader">Enumeration Type Documentation</h2>
<p>Flags to be passed as <aclass="el"href="struct_vma_allocation_create_info.html#add09658ac14fe290ace25470ddd6d41b"title="Use VmaAllocationCreateFlagBits enum. ">VmaAllocationCreateInfo::flags</a>. </p>
<tableclass="fieldtable">
<tr><thcolspan="2">Enumerator</th></tr><tr><tdclass="fieldname"><aid="ad9889c10c798b040d59c92f257cae597a3fc311d855c2ff53f1090ef5c722b38f"></a>VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT </td><tdclass="fielddoc"><p>Set this flag if the allocation should have its own memory block. </p>
<p>Use it for special, big resources, like fullscreen images used as attachments.</p>
<p>This flag must also be used for host visible resources that you want to map simultaneously because otherwise they might end up as regions of the same <code>VkDeviceMemory</code>, while mapping same <code>VkDeviceMemory</code> multiple times simultaneously is illegal.</p>
<p>You should not use this flag if <aclass="el"href="struct_vma_allocation_create_info.html#a6272c0555cfd1fe28bff1afeb6190150"title="Pool that this allocation should be created in. ">VmaAllocationCreateInfo::pool</a> is not null. </p>
</td></tr>
<tr><tdclass="fieldname"><aid="ad9889c10c798b040d59c92f257cae597a89759603401014eb325eb22a3839f2ff"></a>VMA_ALLOCATION_CREATE_NEVER_ALLOCATE_BIT </td><tdclass="fielddoc"><p>Set this flag to only try to allocate from existing <code>VkDeviceMemory</code> blocks and never create new such block. </p>
<p>If new allocation cannot be placed in any of the existing blocks, allocation fails with <code>VK_ERROR_OUT_OF_DEVICE_MEMORY</code> error.</p>
<p>You should not use <code>VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT</code> and <code>VMA_ALLOCATION_CREATE_NEVER_ALLOCATE_BIT</code> at the same time. It makes no sense.</p>
<p>If <aclass="el"href="struct_vma_allocation_create_info.html#a6272c0555cfd1fe28bff1afeb6190150"title="Pool that this allocation should be created in. ">VmaAllocationCreateInfo::pool</a> is not null, this flag is implied and ignored. </p>
</td></tr>
<tr><tdclass="fieldname"><aid="ad9889c10c798b040d59c92f257cae597ae443691ef3d077c0dc3de5576ac4c312"></a>VMA_ALLOCATION_CREATE_PERSISTENT_MAP_BIT </td><tdclass="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 <aclass="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 <aclass="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>
</td></tr>
<tr><tdclass="fieldname"><aid="ad9889c10c798b040d59c92f257cae597a5f436af6c8fe8540573a6d22627a6fd2"></a>VMA_ALLOCATION_CREATE_CAN_BECOME_LOST_BIT </td><tdclass="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 <aclass="el"href="vk__mem__alloc_8h.html#a86dd08aba8633bfa4ad0df2e76481d8b"title="Returns current information about specified allocation. ">vmaGetAllocationInfo()</a> and check if <aclass="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>
<p>For details about supporting lost allocations, see Lost Allocations chapter of User Guide on Main Page. </p>
</td></tr>
<tr><tdclass="fieldname"><aid="ad9889c10c798b040d59c92f257cae597a68686d0ce9beb0d4d1b9f2b8b1389a7e"></a>VMA_ALLOCATION_CREATE_CAN_MAKE_OTHER_LOST_BIT </td><tdclass="fielddoc"><p>While creating allocation using this flag, other allocations that were created with flag <code>VMA_ALLOCATION_CREATE_CAN_BECOME_LOST_BIT</code> can become lost.</p>
<p>For details about supporting lost allocations, see Lost Allocations chapter of User Guide on Main Page. </p>
<tr><thcolspan="2">Enumerator</th></tr><tr><tdclass="fieldname"><aid="a4f87c9100d154a65a4ad495f7763cf7ca4816ddaed324ba110172ca608a20f29d"></a>VMA_ALLOCATOR_CREATE_EXTERNALLY_SYNCHRONIZED_BIT </td><tdclass="fielddoc"><p>Allocator and all objects created from it will not be synchronized internally, so you must guarantee they are used from only one thread at a time or synchronized externally by you. </p>
<p>Using this flag may increase performance because internal mutexes are not used. </p>
</td></tr>
<tr><tdclass="fieldname"><aid="a4f87c9100d154a65a4ad495f7763cf7cace7da7cc6e71a625dfa763c55a597878"></a>VMA_ALLOCATOR_CREATE_KHR_DEDICATED_ALLOCATION_BIT </td><tdclass="fielddoc"><p>Enables usage of VK_KHR_dedicated_allocation extension. </p>
<p>Using this extenion will automatically allocate dedicated blocks of memory for some buffers and images instead of suballocating place for them out of bigger memory blocks (as if you explicitly used VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT flag) when it is recommended by the driver. It may improve performance on some GPUs.</p>
<p>You may set this flag only if you found out that following device extensions are supported, you enabled them while creating Vulkan device passed as <aclass="el"href="struct_vma_allocator_create_info.html#ad924ddd77b04039c88d0c09b0ffcd500"title="Vulkan device. ">VmaAllocatorCreateInfo::device</a>, and you want them to be used internally by this library:</p>
<ul>
<li>VK_KHR_get_memory_requirements2</li>
<li>VK_KHR_dedicated_allocation</li>
</ul>
<p>If this flag is enabled, you must also provide <aclass="el"href="struct_vma_allocator_create_info.html#a3dc197be3227da7338b1643f70db36bd"title="Pointers to Vulkan functions. Can be null if you leave define VMA_STATIC_VULKAN_FUNCTIONS 1...">VmaAllocatorCreateInfo::pVulkanFunctions</a> and fill at least members: <aclass="el"href="struct_vma_vulkan_functions.html#a9d8d1b05d2b1e7e1d9b27f6f585acf9c">VmaVulkanFunctions::vkGetBufferMemoryRequirements2KHR</a>, <aclass="el"href="struct_vma_vulkan_functions.html#a9cdcdc1e2b2ea7c571f7d27e30ba6875">VmaVulkanFunctions::vkGetImageMemoryRequirements2KHR</a>, because they are never imported statically.</p>
<p>When this flag is set, you can experience following warnings reported by Vulkan validation layer. You can ignore them.</p>
<blockquoteclass="doxtable">
<p>vkBindBufferMemory(): Binding memory to buffer 0x2d but vkGetBufferMemoryRequirements() has not been called on that buffer.</p>
<tr><thcolspan="2">Enumerator</th></tr><tr><tdclass="fieldname"><aid="aa5846affa1e9da3800e3e78fae2305ccaf50d27e34e0925cf3a63db8c839121dd"></a>VMA_MEMORY_USAGE_UNKNOWN </td><tdclass="fielddoc"><p>No intended memory usage specified. Use other members of <aclass="el"href="struct_vma_allocation_create_info.html">VmaAllocationCreateInfo</a> to specify your requirements. </p>
</td></tr>
<tr><tdclass="fieldname"><aid="aa5846affa1e9da3800e3e78fae2305ccac6b5dc1432d88647aa4cd456246eadf7"></a>VMA_MEMORY_USAGE_GPU_ONLY </td><tdclass="fielddoc"><p>Memory will be used on device only, so faster access from the device is preferred. No need to be mappable on host. </p>
</td></tr>
<tr><tdclass="fieldname"><aid="aa5846affa1e9da3800e3e78fae2305cca40bdf4cddeffeb12f43d45ca1286e0a5"></a>VMA_MEMORY_USAGE_CPU_ONLY </td><tdclass="fielddoc"><p>Memory will be mapped on host. Could be used for transfer to/from device. </p>
<p>Guarantees to be <code>HOST_VISIBLE</code> and <code>HOST_COHERENT</code>. </p>
</td></tr>
<tr><tdclass="fieldname"><aid="aa5846affa1e9da3800e3e78fae2305cca9066b52c5a7079bb74a69aaf8b92ff67"></a>VMA_MEMORY_USAGE_CPU_TO_GPU </td><tdclass="fielddoc"><p>Memory will be used for frequent (dynamic) updates from host and reads on device (upload). </p>
<p>Guarantees to be <code>HOST_VISIBLE</code>. </p>
</td></tr>
<tr><tdclass="fieldname"><aid="aa5846affa1e9da3800e3e78fae2305cca7b586d2fdaf82a463b58f581ed72be27"></a>VMA_MEMORY_USAGE_GPU_TO_CPU </td><tdclass="fielddoc"><p>Memory will be used for frequent writing on device and readback on host (download). </p>
<p>Guarantees to be <code>HOST_VISIBLE</code>. </p>
<p>Flags to be passed as <aclass="el"href="struct_vma_pool_create_info.html#a8405139f63d078340ae74513a59f5446"title="Use combination of VmaPoolCreateFlagBits. ">VmaPoolCreateInfo::flags</a>. </p>
<tableclass="fieldtable">
<tr><thcolspan="2">Enumerator</th></tr><tr><tdclass="fieldname"><aid="a9a7c45f9c863695d98c83fa5ac940fe7a918441f7b40dca90481b114f5d224fe9"></a>VMA_POOL_CREATE_PERSISTENT_MAP_BIT </td><tdclass="fielddoc"><p>Set this flag to use a memory that will be persistently mapped.</p>
<p>Each allocation made from this pool will have <aclass="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> available.</p>
<p>Usage of this flag must match usage of VMA_ALLOCATION_CREATE_PERSISTENT_MAP_BIT flag for every allocation made from this pool. </p>
</td></tr>
<tr><tdclass="fieldname"><aid="a9a7c45f9c863695d98c83fa5ac940fe7a9f1a499508a8edb4e8ba40aa0290a3d2"></a>VMA_POOL_CREATE_IGNORE_BUFFER_IMAGE_GRANULARITY_BIT </td><tdclass="fielddoc"><p>Use this flag if you always allocate only buffers and linear images or only optimal images out of this pool and so Buffer-Image Granularity can be ignored. </p>
<p>This is na optional optimization flag.</p>
<p>If you always allocate using <aclass="el"href="vk__mem__alloc_8h.html#ac72ee55598617e8eecca384e746bab51">vmaCreateBuffer()</a>, <aclass="el"href="vk__mem__alloc_8h.html#a02a94f25679275851a53e82eacbcfc73"title="Function similar to vmaCreateBuffer(). ">vmaCreateImage()</a>, <aclass="el"href="vk__mem__alloc_8h.html#a7fdf64415b6c3d83c454f28d2c53df7b">vmaAllocateMemoryForBuffer()</a>, then you don't need to use it because allocator knows exact type of your allocations so it can handle Buffer-Image Granularity in the optimal way.</p>
<p>If you also allocate using <aclass="el"href="vk__mem__alloc_8h.html#a0faa3f9e5fb233d29d1e00390650febb"title="Function similar to vmaAllocateMemoryForBuffer(). ">vmaAllocateMemoryForImage()</a> or <aclass="el"href="vk__mem__alloc_8h.html#abf28077dbf82d0908b8acbe8ee8dd9b8"title="General purpose memory allocation. ">vmaAllocateMemory()</a>, exact type of such allocations is not known, so allocator must be conservative in handling Buffer-Image Granularity, which can lead to suboptimal allocation (wasted memory). In that case, if you can make sure you always allocate only buffers and linear images or only optimal images out of this pool, use this flag to make allocator disregard Buffer-Image Granularity and so make allocations more optimal. </p>
<tr><tdclass="paramdir">[out]</td><tdclass="paramname">pAllocation</td><td>Handle to allocated memory. </td></tr>
<tr><tdclass="paramdir">[out]</td><tdclass="paramname">pAllocationInfo</td><td>Optional. Information about allocated memory. It can be later fetched using function <aclass="el"href="vk__mem__alloc_8h.html#a86dd08aba8633bfa4ad0df2e76481d8b"title="Returns current information about specified allocation. ">vmaGetAllocationInfo()</a>.</td></tr>
</table>
</dd>
</dl>
<p>You should free the memory using <aclass="el"href="vk__mem__alloc_8h.html#a11f0fbc034fa81a4efedd73d61ce7568"title="Frees memory previously allocated using vmaAllocateMemory(), vmaAllocateMemoryForBuffer(), or vmaAllocateMemoryForImage(). ">vmaFreeMemory()</a>.</p>
<p>It is recommended to use <aclass="el"href="vk__mem__alloc_8h.html#a7fdf64415b6c3d83c454f28d2c53df7b">vmaAllocateMemoryForBuffer()</a>, <aclass="el"href="vk__mem__alloc_8h.html#a0faa3f9e5fb233d29d1e00390650febb"title="Function similar to vmaAllocateMemoryForBuffer(). ">vmaAllocateMemoryForImage()</a>, <aclass="el"href="vk__mem__alloc_8h.html#ac72ee55598617e8eecca384e746bab51">vmaCreateBuffer()</a>, <aclass="el"href="vk__mem__alloc_8h.html#a02a94f25679275851a53e82eacbcfc73"title="Function similar to vmaCreateBuffer(). ">vmaCreateImage()</a> instead whenever possible. </p>
<tr><tdclass="paramdir">[out]</td><tdclass="paramname">pAllocation</td><td>Handle to allocated memory. </td></tr>
<tr><tdclass="paramdir">[out]</td><tdclass="paramname">pAllocationInfo</td><td>Optional. Information about allocated memory. It can be later fetched using function <aclass="el"href="vk__mem__alloc_8h.html#a86dd08aba8633bfa4ad0df2e76481d8b"title="Returns current information about specified allocation. ">vmaGetAllocationInfo()</a>.</td></tr>
</table>
</dd>
</dl>
<p>You should free the memory using <aclass="el"href="vk__mem__alloc_8h.html#a11f0fbc034fa81a4efedd73d61ce7568"title="Frees memory previously allocated using vmaAllocateMemory(), vmaAllocateMemoryForBuffer(), or vmaAllocateMemoryForImage(). ">vmaFreeMemory()</a>. </p>
<p>Builds and returns statistics as string in JSON format. </p>
<dlclass="params"><dt>Parameters</dt><dd>
<tableclass="params">
<tr><tdclass="paramdir">[out]</td><tdclass="paramname">ppStatsString</td><td>Must be freed using <aclass="el"href="vk__mem__alloc_8h.html#a3104eb30d8122c84dd8541063f145288">vmaFreeStatsString()</a> function. </td></tr>
<tr><tdclass="paramdir">[out]</td><tdclass="paramname">pBuffer</td><td>Buffer that was created. </td></tr>
<tr><tdclass="paramdir">[out]</td><tdclass="paramname">pAllocation</td><td>Allocation that was created. </td></tr>
<tr><tdclass="paramdir">[out]</td><tdclass="paramname">pAllocationInfo</td><td>Optional. Information about allocated memory. It can be later fetched using function <aclass="el"href="vk__mem__alloc_8h.html#a86dd08aba8633bfa4ad0df2e76481d8b"title="Returns current information about specified allocation. ">vmaGetAllocationInfo()</a>.</td></tr>
</table>
</dd>
</dl>
<p>This function automatically:</p>
<oltype="1">
<li>Creates buffer.</li>
<li>Allocates appropriate memory for it.</li>
<li>Binds the buffer with the memory.</li>
</ol>
<p>If any of these operations fail, buffer and allocation are not created, returned value is negative error code, *pBuffer and *pAllocation are null.</p>
<p>If the function succeeded, you must destroy both buffer and allocation when you no longer need them using either convenience function <aclass="el"href="vk__mem__alloc_8h.html#a0d9f4e4ba5bf9aab1f1c746387753d77"title="Destroys Vulkan buffer and frees allocated memory. ">vmaDestroyBuffer()</a> or separately, using vkDestroyBuffer() and <aclass="el"href="vk__mem__alloc_8h.html#a11f0fbc034fa81a4efedd73d61ce7568"title="Frees memory previously allocated using vmaAllocateMemory(), vmaAllocateMemoryForBuffer(), or vmaAllocateMemoryForImage(). ">vmaFreeMemory()</a>. </p>
<p>Creates new allocation that is in lost state from the beginning. </p>
<p>It can be useful if you need a dummy, non-null allocation.</p>
<p>You still need to destroy created object using <aclass="el"href="vk__mem__alloc_8h.html#a11f0fbc034fa81a4efedd73d61ce7568"title="Frees memory previously allocated using vmaAllocateMemory(), vmaAllocateMemoryForBuffer(), or vmaAllocateMemoryForImage(). ">vmaFreeMemory()</a>.</p>
<p>Returned allocation is not tied to any specific memory pool or memory type and not bound to any image or buffer. It has size = 0. It cannot be turned into a real, non-empty allocation. </p>
<tr><tdclass="paramdir"></td><tdclass="paramname">pAllocations</td><td>Array of allocations that can be moved during this compation. </td></tr>
<tr><tdclass="paramdir"></td><tdclass="paramname">allocationCount</td><td>Number of elements in pAllocations and pAllocationsChanged arrays. </td></tr>
<tr><tdclass="paramdir">[out]</td><tdclass="paramname">pAllocationsChanged</td><td>Array of boolean values that will indicate whether matching allocation in pAllocations array has been moved. This parameter is optional. Pass null if you don't need this information. </td></tr>
<tr><tdclass="paramdir"></td><tdclass="paramname">pDefragmentationInfo</td><td>Configuration parameters. Optional - pass null to use default values. </td></tr>
<tr><tdclass="paramdir">[out]</td><tdclass="paramname">pDefragmentationStats</td><td>Statistics returned by the function. Optional - pass null if you don't need this information. </td></tr>
</table>
</dd>
</dl>
<dlclass="section return"><dt>Returns</dt><dd>VK_SUCCESS if completed, VK_INCOMPLETE if succeeded but didn't make all possible optimizations because limits specified in pDefragmentationInfo have been reached, negative error code in case of error.</dd></dl>
<p>This function works by moving allocations to different places (different <code>VkDeviceMemory</code> objects and/or different offsets) in order to optimize memory usage. Only allocations that are in pAllocations array can be moved. All other allocations are considered nonmovable in this call. Basic rules:</p>
<ul>
<li>Only allocations made in memory types that have <code>VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT</code> flag can be compacted. You may pass other allocations but it makes no sense - these will never be moved.</li>
<li>You may pass allocations made with <code>VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT</code> but it makes no sense - they will never be moved.</li>
<li>Both allocations made with or without <code>VMA_ALLOCATION_CREATE_PERSISTENT_MAP_BIT</code> flag can be compacted. If not persistently mapped, memory will be mapped temporarily inside this function if needed, so it shouldn't be mapped by you for the time of this call.</li>
<li>You must not pass same <code>VmaAllocation</code> object multiple times in pAllocations array.</li>
</ul>
<p>The function also frees empty <code>VkDeviceMemory</code> blocks.</p>
<p>After allocation has been moved, its <aclass="el"href="struct_vma_allocation_info.html#ae0bfb7dfdf79a76ffefc9a94677a2f67"title="Handle to Vulkan memory object. ">VmaAllocationInfo::deviceMemory</a> and/or <aclass="el"href="struct_vma_allocation_info.html#a4a3c732388dbdc7a23f9365b00825268"title="Offset into deviceMemory object to the beginning of this allocation, in bytes. (deviceMemory, offset) pair is unique to this allocation. ">VmaAllocationInfo::offset</a> changes. You must query them again using <aclass="el"href="vk__mem__alloc_8h.html#a86dd08aba8633bfa4ad0df2e76481d8b"title="Returns current information about specified allocation. ">vmaGetAllocationInfo()</a> if you need them.</p>
<p>If an allocation has been moved, data in memory is copied to new place automatically, but if it was bound to a buffer or an image, you must destroy that object yourself, create new one and bind it to the new memory pointed by the allocation. You must use <code>vkDestroyBuffer()</code>, <code>vkDestroyImage()</code>, <code>vkCreateBuffer()</code>, <code>vkCreateImage()</code> for that purpose and NOT <aclass="el"href="vk__mem__alloc_8h.html#a0d9f4e4ba5bf9aab1f1c746387753d77"title="Destroys Vulkan buffer and frees allocated memory. ">vmaDestroyBuffer()</a>, <aclass="el"href="vk__mem__alloc_8h.html#ae50d2cb3b4a3bfd4dd40987234e50e7e"title="Destroys Vulkan image and frees allocated memory. ">vmaDestroyImage()</a>, <aclass="el"href="vk__mem__alloc_8h.html#ac72ee55598617e8eecca384e746bab51">vmaCreateBuffer()</a>, <aclass="el"href="vk__mem__alloc_8h.html#a02a94f25679275851a53e82eacbcfc73"title="Function similar to vmaCreateBuffer(). ">vmaCreateImage()</a>! Example:</p>
</pre><p>This function may be time-consuming, so you shouldn't call it too often (like every frame or after every resource creation/destruction), but rater you can call it on special occasions (like when reloading a game level, when you just destroyed a lot of objects). </p>
<p>This algorithm tries to find a memory type that:</p>
<ul>
<li>Is allowed by memoryTypeBits.</li>
<li>Contains all the flags from pAllocationCreateInfo->requiredFlags.</li>
<li>Matches intended usage.</li>
<li>Has as many flags from pAllocationCreateInfo->preferredFlags as possible.</li>
</ul>
<dlclass="section return"><dt>Returns</dt><dd>Returns VK_ERROR_FEATURE_NOT_PRESENT if not found. Receiving such result from this function or any other allocating function probably means that your device doesn't support any memory type with requested features for the specific type of resource you want to use it for. Please check parameters of your resource, like image layout (OPTIMAL versus LINEAR) or mip level count. </dd></dl>
<p>Frees memory previously allocated using <aclass="el"href="vk__mem__alloc_8h.html#abf28077dbf82d0908b8acbe8ee8dd9b8"title="General purpose memory allocation. ">vmaAllocateMemory()</a>, <aclass="el"href="vk__mem__alloc_8h.html#a7fdf64415b6c3d83c454f28d2c53df7b">vmaAllocateMemoryForBuffer()</a>, or <aclass="el"href="vk__mem__alloc_8h.html#a0faa3f9e5fb233d29d1e00390650febb"title="Function similar to vmaAllocateMemoryForBuffer(). ">vmaAllocateMemoryForImage()</a>. </p>
<p>PhysicalDeviceMemoryProperties are fetched from physicalDevice by the allocator. You can access it here, without fetching it again on your own. </p>
<p>Given Memory Type Index, returns Property Flags of this memory type. </p>
<p>This is just a convenience function. Same information can be obtained using <aclass="el"href="vk__mem__alloc_8h.html#ab88db292a17974f911182543fda52d19">vmaGetMemoryProperties()</a>. </p>
<p>Marks all allocations in given pool as lost if they are not used in current frame or <aclass="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> back from now. </p>
<tr><tdclass="paramdir">[out]</td><tdclass="paramname">pLostAllocationCount</td><td>Number of allocations marked as lost. Optional - pass null if you don't need this information. </td></tr>
<p>Feel free to use vkMapMemory on these memory blocks on you own if you want, but just for convenience and to make sure correct offset and size is always specified, usage of <aclass="el"href="vk__mem__alloc_8h.html#ad5bd1243512d099706de88168992f069">vmaMapMemory()</a> / <aclass="el"href="vk__mem__alloc_8h.html#a9bc268595cb33f6ec4d519cfce81ff45">vmaUnmapMemory()</a> is recommended.</p>
<p>Do not use it on memory allocated with <code>VMA_ALLOCATION_CREATE_PERSISTENT_MAP_BIT</code> as multiple maps to same <code>VkDeviceMemory</code> is illegal. </p>
<p>Maps back persistently mapped memory of types that are <code>HOST_COHERENT</code> and <code>DEVICE_LOCAL</code>. </p>
<p>See <aclass="el"href="vk__mem__alloc_8h.html#a26b87244491c1fe77f11fe9ab5779c27"title="Unmaps persistently mapped memory of types that are HOST_COHERENT and DEVICE_LOCAL. ">vmaUnmapPersistentlyMappedMemory()</a>.</p>
<p>After this call <aclass="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> of some allocation may have value different than before calling <aclass="el"href="vk__mem__alloc_8h.html#a26b87244491c1fe77f11fe9ab5779c27"title="Unmaps persistently mapped memory of types that are HOST_COHERENT and DEVICE_LOCAL. ">vmaUnmapPersistentlyMappedMemory()</a>. </p>
<p>This function must be used if you make allocations with <code>VMA_ALLOCATION_CREATE_CAN_BECOME_LOST_BIT</code> and <code>VMA_ALLOCATION_CREATE_CAN_MAKE_OTHER_LOST_BIT</code> flags to inform the allocator when a new frame begins. Allocations queried using <aclass="el"href="vk__mem__alloc_8h.html#a86dd08aba8633bfa4ad0df2e76481d8b"title="Returns current information about specified allocation. ">vmaGetAllocationInfo()</a> cannot become lost in the current frame. </p>
<p>Unmaps persistently mapped memory of types that are <code>HOST_COHERENT</code> and <code>DEVICE_LOCAL</code>. </p>
<p>This is optional performance optimization. On AMD GPUs on Windows, Vulkan memory from the type that has both <code>DEVICE_LOCAL</code> and <code>HOST_VISIBLE</code> flags should not be mapped for the time of any call to <code>vkQueueSubmit()</code> or <code>vkQueuePresent()</code>. Although legal, that would cause performance degradation because WDDM migrates such memory to system RAM. To ensure this, you can unmap all persistently mapped memory using this function. Example:</p>
</pre><p>After this call <aclass="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> of some allocations may become null.</p>
<p>This call is reference-counted. Memory is mapped again after you call <aclass="el"href="vk__mem__alloc_8h.html#a03366170bb8e186605518d2f5d65b85a"title="Maps back persistently mapped memory of types that are HOST_COHERENT and DEVICE_LOCAL. ">vmaMapPersistentlyMappedMemory()</a> same number of times that you called <aclass="el"href="vk__mem__alloc_8h.html#a26b87244491c1fe77f11fe9ab5779c27"title="Unmaps persistently mapped memory of types that are HOST_COHERENT and DEVICE_LOCAL. ">vmaUnmapPersistentlyMappedMemory()</a>. </p>
