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Added functions vmaCopyMemoryToAllocation, vmaCopyAllocationToMemory

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Few other minor fixes and improvements.
Regenerated documentation.
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Adam Sawicki 2024-01-21 13:30:23 +01:00
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<title>Vulkan Memory Allocator: Resource aliasing (overlap)</title>
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<div class="ttc" id="agroup__group__alloc_html_ga3d3ca45799923aa5d138e9e5f9eb2da5"><div class="ttname"><a href="group__group__alloc.html#ga3d3ca45799923aa5d138e9e5f9eb2da5">vmaBindImageMemory</a></div><div class="ttdeci">VkResult vmaBindImageMemory(VmaAllocator allocator, VmaAllocation allocation, VkImage image)</div><div class="ttdoc">Binds image to allocation.</div></div>
<div class="ttc" id="agroup__group__alloc_html_ga5fea5518972ae9094b1526cbcb19b05f"><div class="ttname"><a href="group__group__alloc.html#ga5fea5518972ae9094b1526cbcb19b05f">vmaFreeMemory</a></div><div class="ttdeci">void vmaFreeMemory(VmaAllocator allocator, const VmaAllocation allocation)</div><div class="ttdoc">Frees memory previously allocated using vmaAllocateMemory(), vmaAllocateMemoryForBuffer(),...</div></div>
<div class="ttc" id="agroup__group__alloc_html_gabf28077dbf82d0908b8acbe8ee8dd9b8"><div class="ttname"><a href="group__group__alloc.html#gabf28077dbf82d0908b8acbe8ee8dd9b8">vmaAllocateMemory</a></div><div class="ttdeci">VkResult vmaAllocateMemory(VmaAllocator allocator, const VkMemoryRequirements *pVkMemoryRequirements, const VmaAllocationCreateInfo *pCreateInfo, VmaAllocation *pAllocation, VmaAllocationInfo *pAllocationInfo)</div><div class="ttdoc">General purpose memory allocation.</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:1223</div></div>
<div class="ttc" id="astruct_vma_allocation_create_info_html_a7fe8d81a1ad10b2a2faacacee5b15d6d"><div class="ttname"><a href="struct_vma_allocation_create_info.html#a7fe8d81a1ad10b2a2faacacee5b15d6d">VmaAllocationCreateInfo::preferredFlags</a></div><div class="ttdeci">VkMemoryPropertyFlags preferredFlags</div><div class="ttdoc">Flags that preferably should be set in a memory type chosen for an allocation.</div><div class="ttdef"><b>Definition</b> vk_mem_alloc.h:1241</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:1245</div></div>
<div class="ttc" id="astruct_vma_allocation_create_info_html_a7fe8d81a1ad10b2a2faacacee5b15d6d"><div class="ttname"><a href="struct_vma_allocation_create_info.html#a7fe8d81a1ad10b2a2faacacee5b15d6d">VmaAllocationCreateInfo::preferredFlags</a></div><div class="ttdeci">VkMemoryPropertyFlags preferredFlags</div><div class="ttdoc">Flags that preferably should be set in a memory type chosen for an allocation.</div><div class="ttdef"><b>Definition</b> vk_mem_alloc.h:1263</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>VMA also provides convenience functions that create a buffer or image and bind it to memory represented by an existing <a class="el" href="struct_vma_allocation.html" title="Represents single memory allocation.">VmaAllocation</a>: <a class="el" href="group__group__alloc.html#ga60d5d4803e3c82505a2bfddb929adb03" title="Creates a new VkBuffer, binds already created memory for it.">vmaCreateAliasingBuffer()</a>, <a class="el" href="group__group__alloc.html#gaf0cf014344213e117bd9f9cf5f928122" title="Creates a new VkBuffer, binds already created memory for it.">vmaCreateAliasingBuffer2()</a>, <a class="el" href="group__group__alloc.html#gaebc4db1f94b53dba2338b4c0fd80d0dc" title="Function similar to vmaCreateAliasingBuffer() but for images.">vmaCreateAliasingImage()</a>, <a class="el" href="group__group__alloc.html#ga69ac829f5bb0737449fa92c2d971f1bb" title="Function similar to vmaCreateAliasingBuffer2() but for images.">vmaCreateAliasingImage2()</a>. Versions with "2" offer additional parameter <code>allocationLocalOffset</code>.</p>
<p>Remember that using resources that alias in memory requires proper synchronization. You need to issue a memory barrier to make sure commands that use <code>img1</code> and <code>img2</code> don't overlap on GPU timeline. You also need to treat a resource after aliasing as uninitialized - containing garbage data. For example, if you use <code>img1</code> and then want to use <code>img2</code>, you need to issue an image memory barrier for <code>img2</code> with <code>oldLayout</code> = <code>VK_IMAGE_LAYOUT_UNDEFINED</code>.</p>
<p>Additional considerations:</p>
<ul>
<li>Vulkan also allows to interpret contents of memory between aliasing resources consistently in some cases. See chapter 11.8. "Memory Aliasing" of Vulkan specification or <code>VK_IMAGE_CREATE_ALIAS_BIT</code> flag.</li>
<li>You can create more complex layout where different images and buffers are bound at different offsets inside one large allocation. For example, one can imagine a big texture used in some render passes, aliasing with a set of many small buffers used between in some further passes. To bind a resource at non-zero offset in an allocation, use <a class="el" href="group__group__alloc.html#ga2e8f3e97eaf16b2fc0f8db1ece5fa52c" title="Binds buffer to allocation with additional parameters.">vmaBindBufferMemory2()</a> / <a class="el" href="group__group__alloc.html#ga71890c538a738b4ee70a93a4f29fede2" title="Binds image to allocation with additional parameters.">vmaBindImageMemory2()</a>.</li>
<li>You can create more complex layout where different images and buffers are bound at different offsets inside one large allocation. For example, one can imagine a big texture used in some render passes, aliasing with a set of many small buffers used between in some further passes. To bind a resource at non-zero offset in an allocation, use <a class="el" href="group__group__alloc.html#ga861f4f27189a7d11ab9d9eedc825cb6b" title="Binds buffer to allocation with additional parameters.">vmaBindBufferMemory2()</a> / <a class="el" href="group__group__alloc.html#ga5f3502dd7d38b53fb1533ea3921d038d" title="Binds image to allocation with additional parameters.">vmaBindImageMemory2()</a>.</li>
<li>Before allocating memory for the resources you want to alias, check <code>memoryTypeBits</code> returned in memory requirements of each resource to make sure the bits overlap. Some GPUs may expose multiple memory types suitable e.g. only for buffers or images with <code>COLOR_ATTACHMENT</code> usage, so the sets of memory types supported by your resources may be disjoint. Aliasing them is not possible in that case. </li>
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