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Improved documentation regarding selecting Vulkan version

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See #256
Updated to Doxygen 1.9.4.
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Adam Sawicki 2022-06-14 16:43:27 +02:00
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<title>Vulkan Memory Allocator: Quick start</title>
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@ -83,7 +83,7 @@ Project setup</h1>
<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>
</div><!-- fragment --><p >It may be a good idea to create dedicated CPP file just for this purpose.</p>
<p >This library includes header <code>&lt;vulkan/vulkan.h&gt;</code>, which in turn includes <code>&lt;windows.h&gt;</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>
<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 used. STL containers, RTTI, or C++ exceptions are not used.</p>
<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>
<h1><a class="anchor" id="quick_start_initialization"></a>
Initialization</h1>
<p >At program startup:</p>
@ -92,6 +92,15 @@ Initialization</h1>
<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>
</ol>
<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>
<h2><a class="anchor" id="quick_start_initialization_selecting_vulkan_version"></a>
Selecting Vulkan version</h2>
<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>
<p ><b>Step 1: Compile time.</b> By default, VMA compiles with code supporting the highest Vulkan version found in the included <code>&lt;vulkan/vulkan.h&gt;</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>
<div class="fragment"><div class="line"><span class="preprocessor">#define VMA_VULKAN_VERSION 1002000 </span><span class="comment">// Vulkan 1.2</span></div>
<div class="line"><span class="preprocessor">#include &quot;<a class="code" href="vk__mem__alloc_8h.html">vk_mem_alloc.h</a>&quot;</span></div>
</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>
<h2><a class="anchor" id="quick_start_initialization_importing_vulkan_functions"></a>
Importing Vulkan functions</h2>
<p >You may need to configure importing Vulkan functions. There are 3 ways to do this:</p>
<ol type="1">
<li><b>If you link with Vulkan static library</b> (e.g. "vulkan-1.lib" on Windows):<ul>
@ -111,9 +120,16 @@ Initialization</h1>
</ul>
</li>
</ol>
<div class="fragment"><div class="line"><a class="code hl_struct" href="struct_vma_vulkan_functions.html">VmaVulkanFunctions</a> vulkanFunctions = {};</div>
<div class="line">vulkanFunctions.<a class="code hl_variable" href="struct_vma_vulkan_functions.html#a3eafa102f5f8915f093f40675636b849">vkGetInstanceProcAddr</a> = &amp;vkGetInstanceProcAddr;</div>
<div class="line">vulkanFunctions.<a class="code hl_variable" href="struct_vma_vulkan_functions.html#ac383ab9af127e5e136622fa4ebea9e57">vkGetDeviceProcAddr</a> = &amp;vkGetDeviceProcAddr;</div>
<p >Example for case 2:</p>
<div class="fragment"><div class="line"><span class="preprocessor">#define VMA_STATIC_VULKAN_FUNCTIONS 0</span></div>
<div class="line"><span class="preprocessor">#define VMA_DYNAMIC_VULKAN_FUNCTIONS 1</span></div>
<div class="line"><span class="preprocessor">#include &quot;<a class="code" href="vk__mem__alloc_8h.html">vk_mem_alloc.h</a>&quot;</span></div>
<div class="line"> </div>
<div class="line">...</div>
<div class="line"> </div>
<div class="line">VmaVulkanFunctions vulkanFunctions = {};</div>
<div class="line">vulkanFunctions.vkGetInstanceProcAddr = &amp;vkGetInstanceProcAddr;</div>
<div class="line">vulkanFunctions.vkGetDeviceProcAddr = &amp;vkGetDeviceProcAddr;</div>
<div class="line"> </div>
<div class="line"><a class="code hl_struct" href="struct_vma_allocator_create_info.html">VmaAllocatorCreateInfo</a> allocatorCreateInfo = {};</div>
<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>
@ -125,16 +141,13 @@ Initialization</h1>
<div class="line"><a class="code hl_struct" href="struct_vma_allocator.html">VmaAllocator</a> allocator;</div>
<div class="line"><a class="code hl_function" href="group__group__init.html#ga200692051ddb34240248234f5f4c17bb">vmaCreateAllocator</a>(&amp;allocatorCreateInfo, &amp;allocator);</div>
<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>
<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:1001</div></div>
<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:1006</div></div>
<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:1049</div></div>
<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:1054</div></div>
<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:1009</div></div>
<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:1063</div></div>
<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>
<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>
<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>
<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>
<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>
<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>
<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>
<div class="ttc" id="astruct_vma_vulkan_functions_html"><div class="ttname"><a href="struct_vma_vulkan_functions.html">VmaVulkanFunctions</a></div><div class="ttdoc">Pointers to some Vulkan functions - a subset used by the library.</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:954</div></div>
<div class="ttc" id="astruct_vma_vulkan_functions_html_a3eafa102f5f8915f093f40675636b849"><div class="ttname"><a href="struct_vma_vulkan_functions.html#a3eafa102f5f8915f093f40675636b849">VmaVulkanFunctions::vkGetInstanceProcAddr</a></div><div class="ttdeci">PFN_vkGetInstanceProcAddr vkGetInstanceProcAddr</div><div class="ttdoc">Required when using VMA_DYNAMIC_VULKAN_FUNCTIONS.</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:956</div></div>
<div class="ttc" id="astruct_vma_vulkan_functions_html_ac383ab9af127e5e136622fa4ebea9e57"><div class="ttname"><a href="struct_vma_vulkan_functions.html#ac383ab9af127e5e136622fa4ebea9e57">VmaVulkanFunctions::vkGetDeviceProcAddr</a></div><div class="ttdeci">PFN_vkGetDeviceProcAddr vkGetDeviceProcAddr</div><div class="ttdoc">Required when using VMA_DYNAMIC_VULKAN_FUNCTIONS.</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:958</div></div>
</div><!-- fragment --><h1><a class="anchor" id="quick_start_resource_allocation"></a>
Resource allocation</h1>
<p >When you want to create a buffer or image:</p>
@ -154,9 +167,9 @@ Resource allocation</h1>
<div class="line"><a class="code hl_struct" href="struct_vma_allocation.html">VmaAllocation</a> allocation;</div>
<div class="line"><a class="code hl_function" href="group__group__alloc.html#gac72ee55598617e8eecca384e746bab51">vmaCreateBuffer</a>(allocator, &amp;bufferInfo, &amp;allocInfo, &amp;buffer, &amp;allocation, <span class="keyword">nullptr</span>);</div>
<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>
<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:492</div></div>
<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:1222</div></div>
<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:1230</div></div>
<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>
<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>
<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>
<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>
</div><!-- fragment --><p >Don't forget to destroy your objects when no longer needed:</p>
<div class="fragment"><div class="line"><a class="code hl_function" href="group__group__alloc.html#ga0d9f4e4ba5bf9aab1f1c746387753d77">vmaDestroyBuffer</a>(allocator, buffer, allocation);</div>
@ -167,7 +180,7 @@ Resource allocation</h1>
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