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<div class="title">Layer 1 Choosing Memory Type</div> </div>
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Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="struct_vma_allocation_create_info.html">VmaAllocationCreateInfo</a></td></tr>
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Typedefs</h2></td></tr>
<tr class="memitem:gad63b2113c0bfdbeade1cb498f5a8580d"><td class="memItemLeft" align="right" valign="top">typedef enum <a class="el" href="group__layer1.html#gaa5846affa1e9da3800e3e78fae2305cc">VmaMemoryUsage</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__layer1.html#gad63b2113c0bfdbeade1cb498f5a8580d">VmaMemoryUsage</a></td></tr>
<tr class="separator:gad63b2113c0bfdbeade1cb498f5a8580d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gabf6bf6748c7a9fe7ce5b7835c0f56af4"><td class="memItemLeft" align="right" valign="top">typedef enum <a class="el" href="group__layer1.html#gad9889c10c798b040d59c92f257cae597">VmaAllocationCreateFlagBits</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__layer1.html#gabf6bf6748c7a9fe7ce5b7835c0f56af4">VmaAllocationCreateFlagBits</a></td></tr>
<tr class="memdesc:gabf6bf6748c7a9fe7ce5b7835c0f56af4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Flags to be passed as <a class="el" href="struct_vma_allocation_create_info.html#add09658ac14fe290ace25470ddd6d41b" title="Use VmaAllocationCreateFlagBits enum. ">VmaAllocationCreateInfo::flags</a>. <a href="#gabf6bf6748c7a9fe7ce5b7835c0f56af4">More...</a><br /></td></tr>
<tr class="separator:gabf6bf6748c7a9fe7ce5b7835c0f56af4"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga5225e5e11f8376f6a31a1791f3d6e817"><td class="memItemLeft" align="right" valign="top">typedef VkFlags&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__layer1.html#ga5225e5e11f8376f6a31a1791f3d6e817">VmaAllocationCreateFlags</a></td></tr>
<tr class="separator:ga5225e5e11f8376f6a31a1791f3d6e817"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga86c44f9950b40d50088ed93a17870a7a"><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="struct_vma_allocation_create_info.html">VmaAllocationCreateInfo</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__layer1.html#ga86c44f9950b40d50088ed93a17870a7a">VmaAllocationCreateInfo</a></td></tr>
<tr class="separator:ga86c44f9950b40d50088ed93a17870a7a"><td class="memSeparator" colspan="2">&#160;</td></tr>
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Enumerations</h2></td></tr>
<tr class="memitem:gaa5846affa1e9da3800e3e78fae2305cc"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__layer1.html#gaa5846affa1e9da3800e3e78fae2305cc">VmaMemoryUsage</a> { <br />
&#160;&#160;<a class="el" href="group__layer1.html#ggaa5846affa1e9da3800e3e78fae2305ccaf50d27e34e0925cf3a63db8c839121dd">VMA_MEMORY_USAGE_UNKNOWN</a> = 0,
<a class="el" href="group__layer1.html#ggaa5846affa1e9da3800e3e78fae2305ccac6b5dc1432d88647aa4cd456246eadf7">VMA_MEMORY_USAGE_GPU_ONLY</a> = 1,
<a class="el" href="group__layer1.html#ggaa5846affa1e9da3800e3e78fae2305cca40bdf4cddeffeb12f43d45ca1286e0a5">VMA_MEMORY_USAGE_CPU_ONLY</a> = 2,
<a class="el" href="group__layer1.html#ggaa5846affa1e9da3800e3e78fae2305cca9066b52c5a7079bb74a69aaf8b92ff67">VMA_MEMORY_USAGE_CPU_TO_GPU</a> = 3,
<br />
&#160;&#160;<a class="el" href="group__layer1.html#ggaa5846affa1e9da3800e3e78fae2305cca7b586d2fdaf82a463b58f581ed72be27">VMA_MEMORY_USAGE_GPU_TO_CPU</a> = 4,
<a class="el" href="group__layer1.html#ggaa5846affa1e9da3800e3e78fae2305cca091e69437ef693e8d0d287f1c719ba6e">VMA_MEMORY_USAGE_MAX_ENUM</a> = 0x7FFFFFFF
<br />
}</td></tr>
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<tr class="memitem:gad9889c10c798b040d59c92f257cae597"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__layer1.html#gad9889c10c798b040d59c92f257cae597">VmaAllocationCreateFlagBits</a> { <br />
&#160;&#160;<a class="el" href="group__layer1.html#ggad9889c10c798b040d59c92f257cae597a965e035b69f8728b317803ef2d523aa4">VMA_ALLOCATION_CREATE_OWN_MEMORY_BIT</a> = 0x00000001,
<a class="el" href="group__layer1.html#ggad9889c10c798b040d59c92f257cae597a89759603401014eb325eb22a3839f2ff">VMA_ALLOCATION_CREATE_NEVER_ALLOCATE_BIT</a> = 0x00000002,
<a class="el" href="group__layer1.html#ggad9889c10c798b040d59c92f257cae597ae443691ef3d077c0dc3de5576ac4c312">VMA_ALLOCATION_CREATE_PERSISTENT_MAP_BIT</a> = 0x00000004,
<a class="el" href="group__layer1.html#ggad9889c10c798b040d59c92f257cae597a5f436af6c8fe8540573a6d22627a6fd2">VMA_ALLOCATION_CREATE_CAN_BECOME_LOST_BIT</a> = 0x00000008,
<br />
&#160;&#160;<a class="el" href="group__layer1.html#ggad9889c10c798b040d59c92f257cae597a68686d0ce9beb0d4d1b9f2b8b1389a7e">VMA_ALLOCATION_CREATE_CAN_MAKE_OTHER_LOST_BIT</a> = 0x00000010,
<a class="el" href="group__layer1.html#ggad9889c10c798b040d59c92f257cae597ae5633ec569f4899cf8f29e7385b2f882">VMA_ALLOCATION_CREATE_FLAG_BITS_MAX_ENUM</a> = 0x7FFFFFFF
<br />
}<tr class="memdesc:gad9889c10c798b040d59c92f257cae597"><td class="mdescLeft">&#160;</td><td class="mdescRight">Flags to be passed as <a class="el" href="struct_vma_allocation_create_info.html#add09658ac14fe290ace25470ddd6d41b" title="Use VmaAllocationCreateFlagBits enum. ">VmaAllocationCreateInfo::flags</a>. <a href="group__layer1.html#gad9889c10c798b040d59c92f257cae597">More...</a><br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:gaef15a94b58fbcb0fe706d5720e84a74a"><td class="memItemLeft" align="right" valign="top">VkResult&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__layer1.html#gaef15a94b58fbcb0fe706d5720e84a74a">vmaFindMemoryTypeIndex</a> (VmaAllocator allocator, uint32_t memoryTypeBits, const <a class="el" href="struct_vma_allocation_create_info.html">VmaAllocationCreateInfo</a> *pAllocationCreateInfo, uint32_t *pMemoryTypeIndex)</td></tr>
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</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Typedef Documentation</h2>
<a id="gabf6bf6748c7a9fe7ce5b7835c0f56af4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gabf6bf6748c7a9fe7ce5b7835c0f56af4">&#9670;&nbsp;</a></span>VmaAllocationCreateFlagBits</h2>
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<td class="memname">typedef enum <a class="el" href="group__layer1.html#gad9889c10c798b040d59c92f257cae597">VmaAllocationCreateFlagBits</a> <a class="el" href="group__layer1.html#gad9889c10c798b040d59c92f257cae597">VmaAllocationCreateFlagBits</a></td>
</tr>
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</div><div class="memdoc">
<p>Flags to be passed as <a class="el" href="struct_vma_allocation_create_info.html#add09658ac14fe290ace25470ddd6d41b" title="Use VmaAllocationCreateFlagBits enum. ">VmaAllocationCreateInfo::flags</a>. </p>
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<a id="ga5225e5e11f8376f6a31a1791f3d6e817"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga5225e5e11f8376f6a31a1791f3d6e817">&#9670;&nbsp;</a></span>VmaAllocationCreateFlags</h2>
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<td class="memname">typedef VkFlags <a class="el" href="group__layer1.html#ga5225e5e11f8376f6a31a1791f3d6e817">VmaAllocationCreateFlags</a></td>
</tr>
</table>
</div><div class="memdoc">
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</div>
<a id="ga86c44f9950b40d50088ed93a17870a7a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga86c44f9950b40d50088ed93a17870a7a">&#9670;&nbsp;</a></span>VmaAllocationCreateInfo</h2>
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<td class="memname">typedef struct <a class="el" href="struct_vma_allocation_create_info.html">VmaAllocationCreateInfo</a> <a class="el" href="struct_vma_allocation_create_info.html">VmaAllocationCreateInfo</a></td>
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</table>
</div><div class="memdoc">
</div>
</div>
<a id="gad63b2113c0bfdbeade1cb498f5a8580d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gad63b2113c0bfdbeade1cb498f5a8580d">&#9670;&nbsp;</a></span>VmaMemoryUsage</h2>
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<div class="memproto">
<table class="memname">
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<td class="memname">typedef enum <a class="el" href="group__layer1.html#gaa5846affa1e9da3800e3e78fae2305cc">VmaMemoryUsage</a> <a class="el" href="group__layer1.html#gaa5846affa1e9da3800e3e78fae2305cc">VmaMemoryUsage</a></td>
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</div>
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<h2 class="groupheader">Enumeration Type Documentation</h2>
<a id="gad9889c10c798b040d59c92f257cae597"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gad9889c10c798b040d59c92f257cae597">&#9670;&nbsp;</a></span>VmaAllocationCreateFlagBits</h2>
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<div class="memproto">
<table class="memname">
<tr>
<td class="memname">enum <a class="el" href="group__layer1.html#gad9889c10c798b040d59c92f257cae597">VmaAllocationCreateFlagBits</a></td>
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</table>
</div><div class="memdoc">
<p>Flags to be passed as <a class="el" href="struct_vma_allocation_create_info.html#add09658ac14fe290ace25470ddd6d41b" title="Use VmaAllocationCreateFlagBits enum. ">VmaAllocationCreateInfo::flags</a>. </p>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="ggad9889c10c798b040d59c92f257cae597a965e035b69f8728b317803ef2d523aa4"></a>VMA_ALLOCATION_CREATE_OWN_MEMORY_BIT&#160;</td><td class="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 <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. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggad9889c10c798b040d59c92f257cae597a89759603401014eb325eb22a3839f2ff"></a>VMA_ALLOCATION_CREATE_NEVER_ALLOCATE_BIT&#160;</td><td class="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_OWN_MEMORY_BIT</code> and <code>VMA_ALLOCATION_CREATE_NEVER_ALLOCATE_BIT</code> at the same time. It makes no sense.</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, this flag is implied and ignored. </p>
</td></tr>
<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>
</td></tr>
<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>
<p>For details about supporting lost allocations, see Lost Allocations chapter of User Guide on Main Page. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggad9889c10c798b040d59c92f257cae597a68686d0ce9beb0d4d1b9f2b8b1389a7e"></a>VMA_ALLOCATION_CREATE_CAN_MAKE_OTHER_LOST_BIT&#160;</td><td class="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>
</td></tr>
<tr><td class="fieldname"><a id="ggad9889c10c798b040d59c92f257cae597ae5633ec569f4899cf8f29e7385b2f882"></a>VMA_ALLOCATION_CREATE_FLAG_BITS_MAX_ENUM&#160;</td><td class="fielddoc"></td></tr>
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<a id="gaa5846affa1e9da3800e3e78fae2305cc"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaa5846affa1e9da3800e3e78fae2305cc">&#9670;&nbsp;</a></span>VmaMemoryUsage</h2>
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<td class="memname">enum <a class="el" href="group__layer1.html#gaa5846affa1e9da3800e3e78fae2305cc">VmaMemoryUsage</a></td>
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</table>
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<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="ggaa5846affa1e9da3800e3e78fae2305ccaf50d27e34e0925cf3a63db8c839121dd"></a>VMA_MEMORY_USAGE_UNKNOWN&#160;</td><td class="fielddoc"><p>No intended memory usage specified. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggaa5846affa1e9da3800e3e78fae2305ccac6b5dc1432d88647aa4cd456246eadf7"></a>VMA_MEMORY_USAGE_GPU_ONLY&#160;</td><td class="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><td class="fieldname"><a id="ggaa5846affa1e9da3800e3e78fae2305cca40bdf4cddeffeb12f43d45ca1286e0a5"></a>VMA_MEMORY_USAGE_CPU_ONLY&#160;</td><td class="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><td class="fieldname"><a id="ggaa5846affa1e9da3800e3e78fae2305cca9066b52c5a7079bb74a69aaf8b92ff67"></a>VMA_MEMORY_USAGE_CPU_TO_GPU&#160;</td><td class="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><td class="fieldname"><a id="ggaa5846affa1e9da3800e3e78fae2305cca7b586d2fdaf82a463b58f581ed72be27"></a>VMA_MEMORY_USAGE_GPU_TO_CPU&#160;</td><td class="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>
</td></tr>
<tr><td class="fieldname"><a id="ggaa5846affa1e9da3800e3e78fae2305cca091e69437ef693e8d0d287f1c719ba6e"></a>VMA_MEMORY_USAGE_MAX_ENUM&#160;</td><td class="fielddoc"></td></tr>
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<h2 class="groupheader">Function Documentation</h2>
<a id="gaef15a94b58fbcb0fe706d5720e84a74a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaef15a94b58fbcb0fe706d5720e84a74a">&#9670;&nbsp;</a></span>vmaFindMemoryTypeIndex()</h2>
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<td class="memname">VkResult vmaFindMemoryTypeIndex </td>
<td>(</td>
<td class="paramtype">VmaAllocator&#160;</td>
<td class="paramname"><em>allocator</em>, </td>
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<td></td>
<td class="paramtype">uint32_t&#160;</td>
<td class="paramname"><em>memoryTypeBits</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="struct_vma_allocation_create_info.html">VmaAllocationCreateInfo</a> *&#160;</td>
<td class="paramname"><em>pAllocationCreateInfo</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t *&#160;</td>
<td class="paramname"><em>pMemoryTypeIndex</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<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-&gt;requiredFlags.</li>
<li>Matches intended usage.</li>
<li>Has as many flags from pAllocationCreateInfo-&gt;preferredFlags as possible.</li>
</ul>
<dl class="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>
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