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<li class="navelem"><a class="el" href="index.html">Vulkan Memory Allocator</a></li> </ul>
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<div><div class="header">
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<div class="headertitle"><div class="title">Quick start </div></div>
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</div><!--header-->
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<div class="contents">
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<div class="textblock"><h1><a class="anchor" id="quick_start_project_setup"></a>
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Project setup</h1>
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<p >Vulkan Memory Allocator comes in form of a "stb-style" single header file. You don't need to build it as a separate library project. You can add this file directly to your project and submit it to code repository next to your other source files.</p>
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<p >"Single header" doesn't mean that everything is contained in C/C++ declarations, like it tends to be in case of inline functions or C++ templates. It means that implementation is bundled with interface in a single file and needs to be extracted using preprocessor macro. If you don't do it properly, you will get linker errors.</p>
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<p >To do it properly:</p>
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<ol type="1">
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<li>Include "vk_mem_alloc.h" file in each CPP file where you want to use the library. This includes declarations of all members of the library.</li>
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<li>In exactly one CPP file define following macro before this include. It enables also internal definitions.</li>
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</ol>
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<div class="fragment"><div class="line"><span class="preprocessor">#define VMA_IMPLEMENTATION</span></div>
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<div class="line"><span class="preprocessor">#include "<a class="code" href="vk__mem__alloc_8h.html">vk_mem_alloc.h</a>"</span></div>
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<div class="ttc" id="avk__mem__alloc_8h_html"><div class="ttname"><a href="vk__mem__alloc_8h.html">vk_mem_alloc.h</a></div></div>
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</div><!-- fragment --><p >It may be a good idea to create dedicated CPP file just for this purpose.</p>
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<p >This library includes header <code><vulkan/vulkan.h></code>, which in turn includes <code><windows.h></code> on Windows. If you need some specific macros defined before including these headers (like <code>WIN32_LEAN_AND_MEAN</code> or <code>WINVER</code> for Windows, <code>VK_USE_PLATFORM_WIN32_KHR</code> for Vulkan), you must define them before every <code>#include</code> of this library.</p>
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<p >This library is written in C++, but has C-compatible interface. Thus you can include and use <a class="el" href="vk__mem__alloc_8h.html">vk_mem_alloc.h</a> in C or C++ code, but full implementation with <code>VMA_IMPLEMENTATION</code> macro must be compiled as C++, NOT as C. Some features of C++14 are used. STL containers, RTTI, or C++ exceptions are not used.</p>
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<h1><a class="anchor" id="quick_start_initialization"></a>
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Initialization</h1>
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<p >At program startup:</p>
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<ol type="1">
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<li>Initialize Vulkan to have <code>VkPhysicalDevice</code>, <code>VkDevice</code> and <code>VkInstance</code> object.</li>
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<li>Fill <a class="el" href="struct_vma_allocator_create_info.html" title="Description of a Allocator to be created.">VmaAllocatorCreateInfo</a> structure and create <a class="el" href="struct_vma_allocator.html" title="Represents main object of this library initialized.">VmaAllocator</a> object by calling <a class="el" href="group__group__init.html#ga200692051ddb34240248234f5f4c17bb" title="Creates VmaAllocator object.">vmaCreateAllocator()</a>.</li>
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</ol>
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<p >Only members <code>physicalDevice</code>, <code>device</code>, <code>instance</code> are required. However, you should inform the library which Vulkan version do you use by setting <a class="el" href="struct_vma_allocator_create_info.html#ae0ffc55139b54520a6bb704b29ffc285" title="Optional. The highest version of Vulkan that the application is designed to use.">VmaAllocatorCreateInfo::vulkanApiVersion</a> and which extensions did you enable by setting <a class="el" href="struct_vma_allocator_create_info.html#a392ea2ecbaff93f91a7c49f735ad4346" title="Flags for created allocator. Use VmaAllocatorCreateFlagBits enum.">VmaAllocatorCreateInfo::flags</a> (like <a class="el" href="group__group__init.html#gga4f87c9100d154a65a4ad495f7763cf7ca5f1b28b0414319d1687e1f2b30ab0089">VMA_ALLOCATOR_CREATE_BUFFER_DEVICE_ADDRESS_BIT</a> for VK_KHR_buffer_device_address). Otherwise, VMA would use only features of Vulkan 1.0 core with no extensions.</p>
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<h2><a class="anchor" id="quick_start_initialization_selecting_vulkan_version"></a>
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Selecting Vulkan version</h2>
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<p >VMA supports Vulkan version down to 1.0, for backward compatibility. If you want to use higher version, you need to inform the library about it. This is a two-step proces.</p>
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<p ><b>Step 1: Compile time.</b> By default, VMA compiles with code supporting the highest Vulkan version found in the included <code><vulkan/vulkan.h></code> that is also supported by the library. If this is OK, you don't need to do anything. However, if you want to compile VMA as if only some lower Vulkan version was available, define macro <code>VMA_VULKAN_VERSION</code> before every <code>#include "vk_mem_alloc.h"</code>. It should have decimal numeric value in form of ABBBCCC, where A = major, BBB = minor, CCC = patch Vulkan version. For example, to compile against Vulkan 1.2:</p>
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<div class="fragment"><div class="line"><span class="preprocessor">#define VMA_VULKAN_VERSION 1002000 </span><span class="comment">// Vulkan 1.2</span></div>
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<div class="line"><span class="preprocessor">#include "<a class="code" href="vk__mem__alloc_8h.html">vk_mem_alloc.h</a>"</span></div>
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</div><!-- fragment --><p ><b>Step 2: Runtime.</b> Even when compiled with higher Vulkan version available, VMA can use only features of a lower version, which is configurable during creation of the <a class="el" href="struct_vma_allocator.html" title="Represents main object of this library initialized.">VmaAllocator</a> object. By default, only Vulkan 1.0 is used. To initialize the allocator with support for higher Vulkan version, you need to set member <a class="el" href="struct_vma_allocator_create_info.html#ae0ffc55139b54520a6bb704b29ffc285" title="Optional. The highest version of Vulkan that the application is designed to use.">VmaAllocatorCreateInfo::vulkanApiVersion</a> to an appropriate value, e.g. using constants like <code>VK_API_VERSION_1_2</code>. See code sample below.</p>
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<h2><a class="anchor" id="quick_start_initialization_importing_vulkan_functions"></a>
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Importing Vulkan functions</h2>
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<p >You may need to configure importing Vulkan functions. There are 3 ways to do this:</p>
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<ol type="1">
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<li><b>If you link with Vulkan static library</b> (e.g. "vulkan-1.lib" on Windows):<ul>
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<li>You don't need to do anything.</li>
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<li>VMA will use these, as macro <code>VMA_STATIC_VULKAN_FUNCTIONS</code> is defined to 1 by default.</li>
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</ul>
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</li>
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<li><b>If you want VMA to fetch pointers to Vulkan functions dynamically</b> using <code>vkGetInstanceProcAddr</code>, <code>vkGetDeviceProcAddr</code> (this is the option presented in the example below):<ul>
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<li>Define <code>VMA_STATIC_VULKAN_FUNCTIONS</code> to 0, <code>VMA_DYNAMIC_VULKAN_FUNCTIONS</code> to 1.</li>
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<li>Provide pointers to these two functions via <a class="el" href="struct_vma_vulkan_functions.html#a3eafa102f5f8915f093f40675636b849" title="Required when using VMA_DYNAMIC_VULKAN_FUNCTIONS.">VmaVulkanFunctions::vkGetInstanceProcAddr</a>, <a class="el" href="struct_vma_vulkan_functions.html#ac383ab9af127e5e136622fa4ebea9e57" title="Required when using VMA_DYNAMIC_VULKAN_FUNCTIONS.">VmaVulkanFunctions::vkGetDeviceProcAddr</a>.</li>
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<li>The library will fetch pointers to all other functions it needs internally.</li>
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</ul>
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</li>
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<li><b>If you fetch pointers to all Vulkan functions in a custom way</b>, e.g. using some loader like <a href="https://github.com/zeux/volk">Volk</a>:<ul>
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<li>Define <code>VMA_STATIC_VULKAN_FUNCTIONS</code> and <code>VMA_DYNAMIC_VULKAN_FUNCTIONS</code> to 0.</li>
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<li>Pass these pointers via structure <a class="el" href="struct_vma_vulkan_functions.html" title="Pointers to some Vulkan functions - a subset used by the library.">VmaVulkanFunctions</a>.</li>
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</ul>
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</li>
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</ol>
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<p >Example for case 2:</p>
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<div class="fragment"><div class="line"><span class="preprocessor">#define VMA_STATIC_VULKAN_FUNCTIONS 0</span></div>
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<div class="line"><span class="preprocessor">#define VMA_DYNAMIC_VULKAN_FUNCTIONS 1</span></div>
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<div class="line"><span class="preprocessor">#include "<a class="code" href="vk__mem__alloc_8h.html">vk_mem_alloc.h</a>"</span></div>
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<div class="line"> </div>
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<div class="line">...</div>
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<div class="line"> </div>
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<div class="line">VmaVulkanFunctions vulkanFunctions = {};</div>
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<div class="line">vulkanFunctions.vkGetInstanceProcAddr = &vkGetInstanceProcAddr;</div>
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<div class="line">vulkanFunctions.vkGetDeviceProcAddr = &vkGetDeviceProcAddr;</div>
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<div class="line"> </div>
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<div class="line"><a class="code hl_struct" href="struct_vma_allocator_create_info.html">VmaAllocatorCreateInfo</a> allocatorCreateInfo = {};</div>
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<div class="line">allocatorCreateInfo.<a class="code hl_variable" href="struct_vma_allocator_create_info.html#ae0ffc55139b54520a6bb704b29ffc285">vulkanApiVersion</a> = VK_API_VERSION_1_2;</div>
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<div class="line">allocatorCreateInfo.<a class="code hl_variable" href="struct_vma_allocator_create_info.html#a08230f04ae6ccf8a78150a9e829a7156">physicalDevice</a> = physicalDevice;</div>
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<div class="line">allocatorCreateInfo.<a class="code hl_variable" href="struct_vma_allocator_create_info.html#ad924ddd77b04039c88d0c09b0ffcd500">device</a> = device;</div>
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<div class="line">allocatorCreateInfo.<a class="code hl_variable" href="struct_vma_allocator_create_info.html#a70dd42e29b1df1d1b9b61532ae0b370b">instance</a> = instance;</div>
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<div class="line">allocatorCreateInfo.<a class="code hl_variable" href="struct_vma_allocator_create_info.html#a3dc197be3227da7338b1643f70db36bd">pVulkanFunctions</a> = &vulkanFunctions;</div>
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<div class="line"> </div>
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<div class="line"><a class="code hl_struct" href="struct_vma_allocator.html">VmaAllocator</a> allocator;</div>
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<div class="line"><a class="code hl_function" href="group__group__init.html#ga200692051ddb34240248234f5f4c17bb">vmaCreateAllocator</a>(&allocatorCreateInfo, &allocator);</div>
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<div class="ttc" id="agroup__group__init_html_ga200692051ddb34240248234f5f4c17bb"><div class="ttname"><a href="group__group__init.html#ga200692051ddb34240248234f5f4c17bb">vmaCreateAllocator</a></div><div class="ttdeci">VkResult vmaCreateAllocator(const VmaAllocatorCreateInfo *pCreateInfo, VmaAllocator *pAllocator)</div><div class="ttdoc">Creates VmaAllocator object.</div></div>
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<div class="ttc" id="astruct_vma_allocator_create_info_html"><div class="ttname"><a href="struct_vma_allocator_create_info.html">VmaAllocatorCreateInfo</a></div><div class="ttdoc">Description of a Allocator to be created.</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:998</div></div>
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<div class="ttc" id="astruct_vma_allocator_create_info_html_a08230f04ae6ccf8a78150a9e829a7156"><div class="ttname"><a href="struct_vma_allocator_create_info.html#a08230f04ae6ccf8a78150a9e829a7156">VmaAllocatorCreateInfo::physicalDevice</a></div><div class="ttdeci">VkPhysicalDevice physicalDevice</div><div class="ttdoc">Vulkan physical device.</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:1003</div></div>
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<div class="ttc" id="astruct_vma_allocator_create_info_html_a3dc197be3227da7338b1643f70db36bd"><div class="ttname"><a href="struct_vma_allocator_create_info.html#a3dc197be3227da7338b1643f70db36bd">VmaAllocatorCreateInfo::pVulkanFunctions</a></div><div class="ttdeci">const VmaVulkanFunctions * pVulkanFunctions</div><div class="ttdoc">Pointers to Vulkan functions. Can be null.</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:1046</div></div>
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<div class="ttc" id="astruct_vma_allocator_create_info_html_a70dd42e29b1df1d1b9b61532ae0b370b"><div class="ttname"><a href="struct_vma_allocator_create_info.html#a70dd42e29b1df1d1b9b61532ae0b370b">VmaAllocatorCreateInfo::instance</a></div><div class="ttdeci">VkInstance instance</div><div class="ttdoc">Handle to Vulkan instance object.</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:1051</div></div>
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<div class="ttc" id="astruct_vma_allocator_create_info_html_ad924ddd77b04039c88d0c09b0ffcd500"><div class="ttname"><a href="struct_vma_allocator_create_info.html#ad924ddd77b04039c88d0c09b0ffcd500">VmaAllocatorCreateInfo::device</a></div><div class="ttdeci">VkDevice device</div><div class="ttdoc">Vulkan device.</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:1006</div></div>
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<div class="ttc" id="astruct_vma_allocator_create_info_html_ae0ffc55139b54520a6bb704b29ffc285"><div class="ttname"><a href="struct_vma_allocator_create_info.html#ae0ffc55139b54520a6bb704b29ffc285">VmaAllocatorCreateInfo::vulkanApiVersion</a></div><div class="ttdeci">uint32_t vulkanApiVersion</div><div class="ttdoc">Optional. The highest version of Vulkan that the application is designed to use.</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:1060</div></div>
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<div class="ttc" id="astruct_vma_allocator_html"><div class="ttname"><a href="struct_vma_allocator.html">VmaAllocator</a></div><div class="ttdoc">Represents main object of this library initialized.</div></div>
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</div><!-- fragment --><h1><a class="anchor" id="quick_start_resource_allocation"></a>
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Resource allocation</h1>
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<p >When you want to create a buffer or image:</p>
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<ol type="1">
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<li>Fill <code>VkBufferCreateInfo</code> / <code>VkImageCreateInfo</code> structure.</li>
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<li>Fill <a class="el" href="struct_vma_allocation_create_info.html" title="Parameters of new VmaAllocation.">VmaAllocationCreateInfo</a> structure.</li>
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<li>Call <a class="el" href="group__group__alloc.html#gac72ee55598617e8eecca384e746bab51" title="Creates a new VkBuffer, allocates and binds memory for it.">vmaCreateBuffer()</a> / <a class="el" href="group__group__alloc.html#ga02a94f25679275851a53e82eacbcfc73" title="Function similar to vmaCreateBuffer().">vmaCreateImage()</a> to get <code>VkBuffer</code>/<code>VkImage</code> with memory already allocated and bound to it, plus <a class="el" href="struct_vma_allocation.html" title="Represents single memory allocation.">VmaAllocation</a> objects that represents its underlying memory.</li>
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</ol>
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<div class="fragment"><div class="line">VkBufferCreateInfo bufferInfo = { VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO };</div>
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<div class="line">bufferInfo.size = 65536;</div>
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<div class="line">bufferInfo.usage = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT;</div>
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<div class="line"> </div>
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<div class="line"><a class="code hl_struct" href="struct_vma_allocation_create_info.html">VmaAllocationCreateInfo</a> allocInfo = {};</div>
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<div class="line">allocInfo.<a class="code hl_variable" href="struct_vma_allocation_create_info.html#accb8b06b1f677d858cb9af20705fa910">usage</a> = <a class="code hl_enumvalue" href="group__group__alloc.html#ggaa5846affa1e9da3800e3e78fae2305cca27cde9026a84d34d525777baa41fce6e">VMA_MEMORY_USAGE_AUTO</a>;</div>
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<div class="line"> </div>
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<div class="line">VkBuffer buffer;</div>
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<div class="line"><a class="code hl_struct" href="struct_vma_allocation.html">VmaAllocation</a> allocation;</div>
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<div class="line"><a class="code hl_function" href="group__group__alloc.html#gac72ee55598617e8eecca384e746bab51">vmaCreateBuffer</a>(allocator, &bufferInfo, &allocInfo, &buffer, &allocation, <span class="keyword">nullptr</span>);</div>
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<div class="ttc" id="agroup__group__alloc_html_gac72ee55598617e8eecca384e746bab51"><div class="ttname"><a href="group__group__alloc.html#gac72ee55598617e8eecca384e746bab51">vmaCreateBuffer</a></div><div class="ttdeci">VkResult vmaCreateBuffer(VmaAllocator allocator, const VkBufferCreateInfo *pBufferCreateInfo, const VmaAllocationCreateInfo *pAllocationCreateInfo, VkBuffer *pBuffer, VmaAllocation *pAllocation, VmaAllocationInfo *pAllocationInfo)</div><div class="ttdoc">Creates a new VkBuffer, allocates and binds memory for it.</div></div>
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<div class="ttc" id="agroup__group__alloc_html_ggaa5846affa1e9da3800e3e78fae2305cca27cde9026a84d34d525777baa41fce6e"><div class="ttname"><a href="group__group__alloc.html#ggaa5846affa1e9da3800e3e78fae2305cca27cde9026a84d34d525777baa41fce6e">VMA_MEMORY_USAGE_AUTO</a></div><div class="ttdeci">@ VMA_MEMORY_USAGE_AUTO</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:489</div></div>
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<div class="ttc" id="astruct_vma_allocation_create_info_html"><div class="ttname"><a href="struct_vma_allocation_create_info.html">VmaAllocationCreateInfo</a></div><div class="ttdoc">Parameters of new VmaAllocation.</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:1219</div></div>
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<div class="ttc" id="astruct_vma_allocation_create_info_html_accb8b06b1f677d858cb9af20705fa910"><div class="ttname"><a href="struct_vma_allocation_create_info.html#accb8b06b1f677d858cb9af20705fa910">VmaAllocationCreateInfo::usage</a></div><div class="ttdeci">VmaMemoryUsage usage</div><div class="ttdoc">Intended usage of memory.</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:1227</div></div>
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<div class="ttc" id="astruct_vma_allocation_html"><div class="ttname"><a href="struct_vma_allocation.html">VmaAllocation</a></div><div class="ttdoc">Represents single memory allocation.</div></div>
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</div><!-- fragment --><p >Don't forget to destroy your objects when no longer needed:</p>
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<div class="fragment"><div class="line"><a class="code hl_function" href="group__group__alloc.html#ga0d9f4e4ba5bf9aab1f1c746387753d77">vmaDestroyBuffer</a>(allocator, buffer, allocation);</div>
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<div class="line"><a class="code hl_function" href="group__group__init.html#gaa8d164061c88f22fb1fd3c8f3534bc1d">vmaDestroyAllocator</a>(allocator);</div>
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<div class="ttc" id="agroup__group__alloc_html_ga0d9f4e4ba5bf9aab1f1c746387753d77"><div class="ttname"><a href="group__group__alloc.html#ga0d9f4e4ba5bf9aab1f1c746387753d77">vmaDestroyBuffer</a></div><div class="ttdeci">void vmaDestroyBuffer(VmaAllocator allocator, VkBuffer buffer, VmaAllocation allocation)</div><div class="ttdoc">Destroys Vulkan buffer and frees allocated memory.</div></div>
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<div class="ttc" id="agroup__group__init_html_gaa8d164061c88f22fb1fd3c8f3534bc1d"><div class="ttname"><a href="group__group__init.html#gaa8d164061c88f22fb1fd3c8f3534bc1d">vmaDestroyAllocator</a></div><div class="ttdeci">void vmaDestroyAllocator(VmaAllocator allocator)</div><div class="ttdoc">Destroys allocator object.</div></div>
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