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<title>Vulkan Memory Allocator: Custom memory pools</title>
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<li class="navelem"><a class="el" href="index.html">Vulkan Memory Allocator</a></li> </ul>
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<div class="title">Custom memory pools </div> </div>
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<div class="textblock"><p>The library automatically creates and manages default memory pool for each memory type available on the device. A pool contains a number of <code>VkDeviceMemory</code> blocks. You can create custom pool and allocate memory out of it. It can be useful if you want to:</p>
<ul>
<li>Keep certain kind of allocations separate from others.</li>
<li>Enforce particular size of Vulkan memory blocks.</li>
<li>Limit maximum amount of Vulkan memory allocated for that pool.</li>
</ul>
<p>To use custom memory pools:</p>
<ol type="1">
<li>Fill <a class="el" href="struct_vma_pool_create_info.html" title="Describes parameter of created VmaPool. ">VmaPoolCreateInfo</a> structure.</li>
<li>Call <a class="el" href="vk__mem__alloc_8h.html#a5c8770ded7c59c8caac6de0c2cb00b50" title="Allocates Vulkan device memory and creates VmaPool object. ">vmaCreatePool()</a> to obtain <code>VmaPool</code> handle.</li>
<li>When making an allocation, set <a class="el" href="struct_vma_allocation_create_info.html#a6272c0555cfd1fe28bff1afeb6190150" title="Pool that this allocation should be created in. ">VmaAllocationCreateInfo::pool</a> to this handle. You don't need to specify any other parameters of this structure, like usage.</li>
</ol>
<p>Example:</p>
<pre class="fragment">.// Create a pool that could have at most 2 blocks, 128 MB each.
VmaPoolCreateInfo poolCreateInfo = {};
poolCreateInfo.memoryTypeIndex = ...
poolCreateInfo.blockSize = 128ull * 1024 * 1024;
poolCreateInfo.maxBlockCount = 2;
VmaPool pool;
vmaCreatePool(allocator, &amp;poolCreateInfo, &amp;pool);
.// Allocate a buffer out of it.
VkBufferCreateInfo bufCreateInfo = { VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO };
bufCreateInfo.size = 1024;
bufCreateInfo.usage = VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT;
VmaAllocationCreateInfo allocCreateInfo = {};
allocCreateInfo.pool = pool;
VkBuffer buf;
VmaAllocation alloc;
VmaAllocationInfo allocInfo;
vmaCreateBuffer(allocator, &amp;bufCreateInfo, &amp;allocCreateInfo, &amp;buf, &amp;alloc, &amp;allocInfo);
</pre><p>You have to free all allocations made from this pool before destroying it.</p>
<pre class="fragment">vmaDestroyBuffer(allocator, buf, alloc);
vmaDestroyPool(allocator, pool);</pre> </div></div><!-- contents -->
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