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<div class="title">Layer 1 Choosing Memory Type</div> </div>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="struct_vma_memory_requirements.html">VmaMemoryRequirements</a></td></tr>
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<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:gaecb50b7fdb759cc4c4346c40819bf00b"><td class="memItemLeft" align="right" valign="top">typedef enum <a class="el" href="group__layer1.html#gadec54ccdb0fd3901e89ac6d38c2619ed">VmaMemoryRequirementFlagBits</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__layer1.html#gaecb50b7fdb759cc4c4346c40819bf00b">VmaMemoryRequirementFlagBits</a></td></tr>
<tr class="memdesc:gaecb50b7fdb759cc4c4346c40819bf00b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Flags to be passed as <a class="el" href="struct_vma_memory_requirements.html#a53c9ea8c3cbcc12dddbe9ae23bb85eb6">VmaMemoryRequirements::flags</a>. <a href="#gaecb50b7fdb759cc4c4346c40819bf00b">More...</a><br /></td></tr>
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<tr class="memitem:gab96b90d34cd1bd0f340fc48f8ca2664a"><td class="memItemLeft" align="right" valign="top">typedef VkFlags&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__layer1.html#gab96b90d34cd1bd0f340fc48f8ca2664a">VmaMemoryRequirementFlags</a></td></tr>
<tr class="separator:gab96b90d34cd1bd0f340fc48f8ca2664a"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gae9ee98bebd6e474aa0ef679e10f1d8ca"><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="struct_vma_memory_requirements.html">VmaMemoryRequirements</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__layer1.html#gae9ee98bebd6e474aa0ef679e10f1d8ca">VmaMemoryRequirements</a></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,
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&#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:gadec54ccdb0fd3901e89ac6d38c2619ed"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__layer1.html#gadec54ccdb0fd3901e89ac6d38c2619ed">VmaMemoryRequirementFlagBits</a> { <a class="el" href="group__layer1.html#ggadec54ccdb0fd3901e89ac6d38c2619eda9831d98a698347b0cd1594db6a29e8ed">VMA_MEMORY_REQUIREMENT_OWN_MEMORY_BIT</a> = 0x00000001,
<a class="el" href="group__layer1.html#ggadec54ccdb0fd3901e89ac6d38c2619edae1a503c29619c0c9885521d371e9b4c4">VMA_MEMORY_REQUIREMENT_NEVER_ALLOCATE_BIT</a> = 0x00000002,
<a class="el" href="group__layer1.html#ggadec54ccdb0fd3901e89ac6d38c2619edae75c9dde227c9d4f64693b1e004106dc">VMA_MEMORY_REQUIREMENT_PERSISTENT_MAP_BIT</a> = 0x00000004,
<a class="el" href="group__layer1.html#ggadec54ccdb0fd3901e89ac6d38c2619eda11f849416519c61bebd90e2e7ecbab21">VMA_MEMORY_REQUIREMENT_FLAG_BITS_MAX_ENUM</a> = 0x7FFFFFFF
}<tr class="memdesc:gadec54ccdb0fd3901e89ac6d38c2619ed"><td class="mdescLeft">&#160;</td><td class="mdescRight">Flags to be passed as <a class="el" href="struct_vma_memory_requirements.html#a53c9ea8c3cbcc12dddbe9ae23bb85eb6">VmaMemoryRequirements::flags</a>. <a href="group__layer1.html#gadec54ccdb0fd3901e89ac6d38c2619ed">More...</a><br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:gadf80663373e94bcef382f17534b8694e"><td class="memItemLeft" align="right" valign="top">VkResult&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__layer1.html#gadf80663373e94bcef382f17534b8694e">vmaFindMemoryTypeIndex</a> (VmaAllocator allocator, uint32_t memoryTypeBits, const <a class="el" href="struct_vma_memory_requirements.html">VmaMemoryRequirements</a> *pMemoryRequirements, uint32_t *pMemoryTypeIndex)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Typedef Documentation</h2>
<a id="gaecb50b7fdb759cc4c4346c40819bf00b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaecb50b7fdb759cc4c4346c40819bf00b">&#9670;&nbsp;</a></span>VmaMemoryRequirementFlagBits</h2>
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<td class="memname">typedef enum <a class="el" href="group__layer1.html#gadec54ccdb0fd3901e89ac6d38c2619ed">VmaMemoryRequirementFlagBits</a> <a class="el" href="group__layer1.html#gadec54ccdb0fd3901e89ac6d38c2619ed">VmaMemoryRequirementFlagBits</a></td>
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<p>Flags to be passed as <a class="el" href="struct_vma_memory_requirements.html#a53c9ea8c3cbcc12dddbe9ae23bb85eb6">VmaMemoryRequirements::flags</a>. </p>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#gab96b90d34cd1bd0f340fc48f8ca2664a">&#9670;&nbsp;</a></span>VmaMemoryRequirementFlags</h2>
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<td class="memname">typedef VkFlags <a class="el" href="group__layer1.html#gab96b90d34cd1bd0f340fc48f8ca2664a">VmaMemoryRequirementFlags</a></td>
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<a id="gae9ee98bebd6e474aa0ef679e10f1d8ca"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gae9ee98bebd6e474aa0ef679e10f1d8ca">&#9670;&nbsp;</a></span>VmaMemoryRequirements</h2>
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<td class="memname">typedef struct <a class="el" href="struct_vma_memory_requirements.html">VmaMemoryRequirements</a> <a class="el" href="struct_vma_memory_requirements.html">VmaMemoryRequirements</a></td>
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<a id="gad63b2113c0bfdbeade1cb498f5a8580d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gad63b2113c0bfdbeade1cb498f5a8580d">&#9670;&nbsp;</a></span>VmaMemoryUsage</h2>
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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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<h2 class="groupheader">Enumeration Type Documentation</h2>
<a id="gadec54ccdb0fd3901e89ac6d38c2619ed"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gadec54ccdb0fd3901e89ac6d38c2619ed">&#9670;&nbsp;</a></span>VmaMemoryRequirementFlagBits</h2>
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<td class="memname">enum <a class="el" href="group__layer1.html#gadec54ccdb0fd3901e89ac6d38c2619ed">VmaMemoryRequirementFlagBits</a></td>
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<p>Flags to be passed as <a class="el" href="struct_vma_memory_requirements.html#a53c9ea8c3cbcc12dddbe9ae23bb85eb6">VmaMemoryRequirements::flags</a>. </p>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="ggadec54ccdb0fd3901e89ac6d38c2619eda9831d98a698347b0cd1594db6a29e8ed"></a>VMA_MEMORY_REQUIREMENT_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 VkDeviceMemory, while mapping same VkDeviceMemory multiple times is illegal. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggadec54ccdb0fd3901e89ac6d38c2619edae1a503c29619c0c9885521d371e9b4c4"></a>VMA_MEMORY_REQUIREMENT_NEVER_ALLOCATE_BIT&#160;</td><td class="fielddoc"><p>Set this flag to only try to allocate from existing VkDeviceMemory blocks and never create new such block. </p>
<p>If new allocation cannot be placed in any of the existing blocks, allocation fails with VK_ERROR_OUT_OF_DEVICE_MEMORY error.</p>
<p>It makes no sense to set VMA_MEMORY_REQUIREMENT_OWN_MEMORY_BIT and VMA_MEMORY_REQUIREMENT_NEVER_ALLOCATE_BIT at the same time. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggadec54ccdb0fd3901e89ac6d38c2619edae75c9dde227c9d4f64693b1e004106dc"></a>VMA_MEMORY_REQUIREMENT_PERSISTENT_MAP_BIT&#160;</td><td class="fielddoc"><p>Set 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 maps of a single VkDeviceMemory are illegal. </p>
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<tr><td class="fieldname"><a id="ggadec54ccdb0fd3901e89ac6d38c2619eda11f849416519c61bebd90e2e7ecbab21"></a>VMA_MEMORY_REQUIREMENT_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>
</div><div class="memdoc">
<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, no need to be mapped 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 device. </p>
<p>Guarantees to be HOST_VISIBLE and HOST_COHERENT. </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. </p>
<p>Guarantees to be HOST_VISIBLE. </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 writing on device and readback on host. </p>
<p>Guarantees to be HOST_VISIBLE. </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>
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<h2 class="memtitle"><span class="permalink"><a href="#gadf80663373e94bcef382f17534b8694e">&#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 class="paramkey"></td>
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<td class="paramtype">uint32_t&#160;</td>
<td class="paramname"><em>memoryTypeBits</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="struct_vma_memory_requirements.html">VmaMemoryRequirements</a> *&#160;</td>
<td class="paramname"><em>pMemoryRequirements</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t *&#160;</td>
<td class="paramname"><em>pMemoryTypeIndex</em>&#160;</td>
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<td></td>
<td>)</td>
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<p>This algorithm tries to find a memory type that:</p>
<ul>
<li>Is allowed by memoryTypeBits.</li>
<li>Contains all the flags from pMemoryRequirements-&gt;requiredFlags.</li>
<li>Matches intended usage.</li>
<li>Has as many flags from pMemoryRequirements-&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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