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Added documentation for VK_KHR_dedicated_allocation extension.

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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">VK_KHR_dedicated_allocation </div> </div>
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<div class="textblock"><p>VK_KHR_dedicated_allocation is a Vulkan extension which can be used to improve performance on some GPUs. It augments Vulkan API with possibility to query driver whether it prefers particular buffer or image to have its own, dedicated allocation (separate <code>VkDeviceMemory</code> block) for better efficiency - to be able to do some internal optimizations.</p>
<p>The extension is supported by this library. It will be used automatically when enabled. To enable it:</p>
<p>1 . When creating Vulkan device, check if following 2 device extensions are supported (call <code>vkEnumerateDeviceExtensionProperties()</code>). If yes, enable them (fill <code>VkDeviceCreateInfo::ppEnabledExtensionNames</code>).</p>
<ul>
<li>VK_KHR_get_memory_requirements2</li>
<li>VK_KHR_dedicated_allocation</li>
</ul>
<p>If you enabled these extensions:</p>
<p>2 . Query device for pointers to following 2 extension functions, using <code>vkGetDeviceProcAddr()</code>. Pass them in structure <a class="el" href="struct_vma_vulkan_functions.html" title="Pointers to some Vulkan functions - a subset used by the library. ">VmaVulkanFunctions</a> while creating your <code>VmaAllocator</code>.</p>
<ul>
<li><code>vkGetBufferMemoryRequirements2KHR</code></li>
<li><code>vkGetImageMemoryRequirements2KHR</code></li>
</ul>
<p>Other members of this structure can be null as long as you leave <code>VMA_STATIC_VULKAN_FUNCTIONS</code> defined to 1, which is the default.</p>
<div class="fragment"><div class="line"><a class="code" href="struct_vma_vulkan_functions.html">VmaVulkanFunctions</a> vulkanFunctions = {};</div><div class="line">vulkanFunctions.<a class="code" href="struct_vma_vulkan_functions.html#a9d8d1b05d2b1e7e1d9b27f6f585acf9c">vkGetBufferMemoryRequirements2KHR</a> =</div><div class="line"> (PFN_vkGetBufferMemoryRequirements2KHR)vkGetDeviceProcAddr(device, <span class="stringliteral">&quot;vkGetBufferMemoryRequirements2KHR&quot;</span>);</div><div class="line">vulkanFunctions.<a class="code" href="struct_vma_vulkan_functions.html#a9cdcdc1e2b2ea7c571f7d27e30ba6875">vkGetImageMemoryRequirements2KHR</a> =</div><div class="line"> (PFN_vkGetImageMemoryRequirements2KHR)vkGetDeviceProcAddr(device, <span class="stringliteral">&quot;vkGetImageMemoryRequirements2KHR&quot;</span>);</div><div class="line"> </div><div class="line"><a class="code" href="struct_vma_allocator_create_info.html">VmaAllocatorCreateInfo</a> allocatorInfo = {};</div><div class="line">allocatorInfo.<a class="code" href="struct_vma_allocator_create_info.html#a3dc197be3227da7338b1643f70db36bd">pVulkanFunctions</a> = &amp;vulkanFunctions;</div><div class="line"><span class="comment">// Fill other members of allocatorInfo...</span></div></div><!-- fragment --><p>3 . Use <code>VMA_ALLOCATOR_CREATE_KHR_DEDICATED_ALLOCATION_BIT</code> flag when creating your <code>VmaAllocator</code> to inform the library that you enabled required extensions and you want the library to use them.</p>
<div class="fragment"><div class="line">allocatorInfo.<a class="code" href="struct_vma_allocator_create_info.html#a392ea2ecbaff93f91a7c49f735ad4346">flags</a> |= <a class="code" href="vk__mem__alloc_8h.html#a4f87c9100d154a65a4ad495f7763cf7cace7da7cc6e71a625dfa763c55a597878">VMA_ALLOCATOR_CREATE_KHR_DEDICATED_ALLOCATION_BIT</a>;</div><div class="line"></div><div class="line"><a class="code" href="vk__mem__alloc_8h.html#a200692051ddb34240248234f5f4c17bb">vmaCreateAllocator</a>(&amp;allocatorInfo, &amp;allocator);</div></div><!-- fragment --><p>That's all. The extension will be automatically used whenever you create a buffer using <a class="el" href="vk__mem__alloc_8h.html#ac72ee55598617e8eecca384e746bab51">vmaCreateBuffer()</a> or image using <a class="el" href="vk__mem__alloc_8h.html#a02a94f25679275851a53e82eacbcfc73" title="Function similar to vmaCreateBuffer(). ">vmaCreateImage()</a>.</p>
<p>To learn more about this extension, see:</p>
<ul>
<li><a href="https://www.khronos.org/registry/vulkan/specs/1.0-extensions/html/vkspec.html#VK_KHR_dedicated_allocation">VK_KHR_dedicated_allocation in Vulkan specification</a></li>
<li><a href="http://asawicki.info/articles/VK_KHR_dedicated_allocation.php5">VK_KHR_dedicated_allocation unofficial manual</a> </li>
</ul>
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<li><a class="el" href="lost_allocations.html">Lost allocations</a></li>
</ul>
</li>
<li><a class="el" href="configuration.html">Configuration</a></li>
<li><a class="el" href="configuration.html">Configuration</a><ul>
<li><a class="el" href="_v_k__k_h_r_dedicated_allocation.html">VK_KHR_dedicated_allocation</a></li>
</ul>
</li>
<li><a class="el" href="thread_safety.html">Thread safety</a></li>
</ul>
<p>See also:</p>

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- \subpage defragmentation
- \subpage lost_allocations
- \subpage configuration
- \subpage VK_KHR_dedicated_allocation
- \subpage thread_safety
See also:
@ -390,6 +391,70 @@ To do it, fill optional member VmaAllocatorCreateInfo::pHeapSizeLimit.
\page VK_KHR_dedicated_allocation VK_KHR_dedicated_allocation
VK_KHR_dedicated_allocation is a Vulkan extension which can be used to improve
performance on some GPUs. It augments Vulkan API with possibility to query
driver whether it prefers particular buffer or image to have its own, dedicated
allocation (separate `VkDeviceMemory` block) for better efficiency - to be able
to do some internal optimizations.
The extension is supported by this library. It will be used automatically when
enabled. To enable it:
1 . When creating Vulkan device, check if following 2 device extensions are
supported (call `vkEnumerateDeviceExtensionProperties()`).
If yes, enable them (fill `VkDeviceCreateInfo::ppEnabledExtensionNames`).
- VK_KHR_get_memory_requirements2
- VK_KHR_dedicated_allocation
If you enabled these extensions:
2 . Query device for pointers to following 2 extension functions, using
`vkGetDeviceProcAddr()`. Pass them in structure VmaVulkanFunctions while creating
your `VmaAllocator`.
- `vkGetBufferMemoryRequirements2KHR`
- `vkGetImageMemoryRequirements2KHR`
Other members of this structure can be null as long as you leave
`VMA_STATIC_VULKAN_FUNCTIONS` defined to 1, which is the default.
\code
VmaVulkanFunctions vulkanFunctions = {};
vulkanFunctions.vkGetBufferMemoryRequirements2KHR =
(PFN_vkGetBufferMemoryRequirements2KHR)vkGetDeviceProcAddr(device, "vkGetBufferMemoryRequirements2KHR");
vulkanFunctions.vkGetImageMemoryRequirements2KHR =
(PFN_vkGetImageMemoryRequirements2KHR)vkGetDeviceProcAddr(device, "vkGetImageMemoryRequirements2KHR");
VmaAllocatorCreateInfo allocatorInfo = {};
allocatorInfo.pVulkanFunctions = &vulkanFunctions;
// Fill other members of allocatorInfo...
\endcode
3 . Use `VMA_ALLOCATOR_CREATE_KHR_DEDICATED_ALLOCATION_BIT` flag when creating
your `VmaAllocator` to inform the library that you enabled required extensions
and you want the library to use them.
\code
allocatorInfo.flags |= VMA_ALLOCATOR_CREATE_KHR_DEDICATED_ALLOCATION_BIT;
vmaCreateAllocator(&allocatorInfo, &allocator);
\endcode
That's all. The extension will be automatically used whenever you create a
buffer using vmaCreateBuffer() or image using vmaCreateImage().
To learn more about this extension, see:
- [VK_KHR_dedicated_allocation in Vulkan specification](https://www.khronos.org/registry/vulkan/specs/1.0-extensions/html/vkspec.html#VK_KHR_dedicated_allocation)
- [VK_KHR_dedicated_allocation unofficial manual](http://asawicki.info/articles/VK_KHR_dedicated_allocation.php5)
\page thread_safety Thread safety
- The library has no global state, so separate `VmaAllocator` objects can be used