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71 | 71 | <div class="contents"> |
72 | 72 | <div class="textblock"><h1><a class="anchor" id="allocation_user_data"></a> |
73 | 73 | Allocation user data</h1> |
74 | | -<p >You can annotate allocations with your own information, e.g. for debugging purposes. To do that, fill <a class="el" href="struct_vma_allocation_create_info.html#a8259e85c272683434f4abb4ddddffe19" title="Custom general-purpose pointer that will be stored in VmaAllocation, can be read as VmaAllocationInfo...">VmaAllocationCreateInfo::pUserData</a> field when creating an allocation. It is an opaque <code>void*</code> pointer. You can use it e.g. as a pointer, some handle, index, key, ordinal number or any other value that would associate the allocation with your custom metadata.</p> |
| 74 | +<p >You can annotate allocations with your own information, e.g. for debugging purposes. To do that, fill <a class="el" href="struct_vma_allocation_create_info.html#a8259e85c272683434f4abb4ddddffe19" title="Custom general-purpose pointer that will be stored in VmaAllocation, can be read as VmaAllocationInfo...">VmaAllocationCreateInfo::pUserData</a> field when creating an allocation. It is an opaque <code>void*</code> pointer. You can use it e.g. as a pointer, some handle, index, key, ordinal number or any other value that would associate the allocation with your custom metadata. It it useful to identify appropriate data structures in your engine given <a class="el" href="struct_vma_allocation.html" title="Represents single memory allocation.">VmaAllocation</a>, e.g. when doing <a class="el" href="defragmentation.html">Defragmentation</a>.</p> |
75 | 75 | <div class="fragment"><div class="line">VkBufferCreateInfo bufCreateInfo = ...</div> |
76 | 76 | <div class="line"> </div> |
77 | 77 | <div class="line">MyBufferMetadata* pMetadata = CreateBufferMetadata();</div> |
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100 | 100 | <p >Values of (non-zero) allocations' <code>pUserData</code> are printed in JSON report created by <a class="el" href="group__group__stats.html#gaa4fee7eb5253377599ef4fd38c93c2a0" title="Builds and returns statistics as a null-terminated string in JSON format.">vmaBuildStatsString()</a> in hexadecimal form.</p> |
101 | 101 | <h1><a class="anchor" id="allocation_names"></a> |
102 | 102 | Allocation names</h1> |
103 | | -<p >There is alternative mode available where <code>pUserData</code> pointer is used to point to a null-terminated string, giving a name to the allocation. To use this mode, set <a class="el" href="group__group__alloc.html#ggad9889c10c798b040d59c92f257cae597aa6f24f821cd6a7c5e4a443f7bf59c520">VMA_ALLOCATION_CREATE_USER_DATA_COPY_STRING_BIT</a> flag in <a class="el" href="struct_vma_allocation_create_info.html#add09658ac14fe290ace25470ddd6d41b" title="Use VmaAllocationCreateFlagBits enum.">VmaAllocationCreateInfo::flags</a>. Then <code>pUserData</code> passed as <a class="el" href="struct_vma_allocation_create_info.html#a8259e85c272683434f4abb4ddddffe19" title="Custom general-purpose pointer that will be stored in VmaAllocation, can be read as VmaAllocationInfo...">VmaAllocationCreateInfo::pUserData</a> or argument to <a class="el" href="group__group__alloc.html#gaf9147d31ffc11d62fc187bde283ed14f" title="Sets pUserData in given allocation to new value.">vmaSetAllocationUserData()</a> must be either null or a pointer to a null-terminated string. The library creates internal copy of the string, so the pointer you pass doesn't need to be valid for whole lifetime of the allocation. You can free it after the call.</p> |
104 | | -<div class="fragment"><div class="line">VkImageCreateInfo imageInfo = ...</div> |
105 | | -<div class="line"> </div> |
106 | | -<div class="line">std::string imageName = <span class="stringliteral">"Texture: "</span>;</div> |
| 103 | +<p >An allocation can also carry a null-terminated string, giving a name to the allocation. To set it, call <a class="el" href="group__group__alloc.html#gabe02cbb0cd913b3f125958179f2020fc" title="Sets pName in given allocation to new value.">vmaSetAllocationName()</a>. The library creates internal copy of the string, so the pointer you pass doesn't need to be valid for whole lifetime of the allocation. You can free it after the call.</p> |
| 104 | +<div class="fragment"><div class="line">std::string imageName = <span class="stringliteral">"Texture: "</span>;</div> |
107 | 105 | <div class="line">imageName += fileName;</div> |
108 | | -<div class="line"> </div> |
109 | | -<div class="line"><a class="code hl_struct" href="struct_vma_allocation_create_info.html">VmaAllocationCreateInfo</a> allocCreateInfo = {};</div> |
110 | | -<div class="line">allocCreateInfo.<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> |
111 | | -<div class="line">allocCreateInfo.<a class="code hl_variable" href="struct_vma_allocation_create_info.html#add09658ac14fe290ace25470ddd6d41b">flags</a> = <a class="code hl_enumvalue" href="group__group__alloc.html#ggad9889c10c798b040d59c92f257cae597aa6f24f821cd6a7c5e4a443f7bf59c520">VMA_ALLOCATION_CREATE_USER_DATA_COPY_STRING_BIT</a>;</div> |
112 | | -<div class="line">allocCreateInfo.<a class="code hl_variable" href="struct_vma_allocation_create_info.html#a8259e85c272683434f4abb4ddddffe19">pUserData</a> = imageName.c_str();</div> |
113 | | -<div class="line"> </div> |
114 | | -<div class="line">VkImage image;</div> |
115 | | -<div class="line"><a class="code hl_struct" href="struct_vma_allocation.html">VmaAllocation</a> allocation;</div> |
116 | | -<div class="line"><a class="code hl_function" href="group__group__alloc.html#ga02a94f25679275851a53e82eacbcfc73">vmaCreateImage</a>(allocator, &imageInfo, &allocCreateInfo, &image, &allocation, <span class="keyword">nullptr</span>);</div> |
117 | | -<div class="ttc" id="agroup__group__alloc_html_ga02a94f25679275851a53e82eacbcfc73"><div class="ttname"><a href="group__group__alloc.html#ga02a94f25679275851a53e82eacbcfc73">vmaCreateImage</a></div><div class="ttdeci">VkResult vmaCreateImage(VmaAllocator allocator, const VkImageCreateInfo *pImageCreateInfo, const VmaAllocationCreateInfo *pAllocationCreateInfo, VkImage *pImage, VmaAllocation *pAllocation, VmaAllocationInfo *pAllocationInfo)</div><div class="ttdoc">Function similar to vmaCreateBuffer().</div></div> |
118 | | -<div class="ttc" id="agroup__group__alloc_html_ggad9889c10c798b040d59c92f257cae597aa6f24f821cd6a7c5e4a443f7bf59c520"><div class="ttname"><a href="group__group__alloc.html#ggad9889c10c798b040d59c92f257cae597aa6f24f821cd6a7c5e4a443f7bf59c520">VMA_ALLOCATION_CREATE_USER_DATA_COPY_STRING_BIT</a></div><div class="ttdeci">@ VMA_ALLOCATION_CREATE_USER_DATA_COPY_STRING_BIT</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:562</div></div> |
119 | | -<div class="ttc" id="astruct_vma_allocation_create_info_html_add09658ac14fe290ace25470ddd6d41b"><div class="ttname"><a href="struct_vma_allocation_create_info.html#add09658ac14fe290ace25470ddd6d41b">VmaAllocationCreateInfo::flags</a></div><div class="ttdeci">VmaAllocationCreateFlags flags</div><div class="ttdoc">Use VmaAllocationCreateFlagBits enum.</div><div class="ttdef"><b>Definition:</b> vk_mem_alloc.h:1225</div></div> |
120 | | -</div><!-- fragment --><p >The value of <code>pUserData</code> pointer of the allocation will be different than the one you passed when setting allocation's name - pointing to a buffer managed internally that holds copy of the string.</p> |
121 | | -<div class="fragment"><div class="line"><a class="code hl_struct" href="struct_vma_allocation_info.html">VmaAllocationInfo</a> allocInfo;</div> |
122 | | -<div class="line"><a class="code hl_function" href="group__group__alloc.html#ga86dd08aba8633bfa4ad0df2e76481d8b">vmaGetAllocationInfo</a>(allocator, allocation, &allocInfo);</div> |
123 | | -<div class="line"><span class="keyword">const</span> <span class="keywordtype">char</span>* imageName = (<span class="keyword">const</span> <span class="keywordtype">char</span>*)allocInfo.<a class="code hl_variable" href="struct_vma_allocation_info.html#adc507656149c04de7ed95d0042ba2a13">pUserData</a>;</div> |
124 | | -<div class="line">printf(<span class="stringliteral">"Image name: %s\n"</span>, imageName);</div> |
125 | | -</div><!-- fragment --><p >That string is also printed in JSON report created by <a class="el" href="group__group__stats.html#gaa4fee7eb5253377599ef4fd38c93c2a0" title="Builds and returns statistics as a null-terminated string in JSON format.">vmaBuildStatsString()</a>.</p> |
126 | | -<dl class="section note"><dt>Note</dt><dd>Passing string name to VMA allocation doesn't automatically set it to the Vulkan buffer or image created with it. You must do it manually using an extension like VK_EXT_debug_utils, which is independent of this library. </dd></dl> |
| 106 | +<div class="line"><a class="code hl_function" href="group__group__alloc.html#gabe02cbb0cd913b3f125958179f2020fc">vmaSetAllocationName</a>(allocator, allocation, imageName.c_str());</div> |
| 107 | +<div class="ttc" id="agroup__group__alloc_html_gabe02cbb0cd913b3f125958179f2020fc"><div class="ttname"><a href="group__group__alloc.html#gabe02cbb0cd913b3f125958179f2020fc">vmaSetAllocationName</a></div><div class="ttdeci">void vmaSetAllocationName(VmaAllocator allocator, VmaAllocation allocation, const char *pName)</div><div class="ttdoc">Sets pName in given allocation to new value.</div></div> |
| 108 | +</div><!-- fragment --><p >The string can be later retrieved by inspecting <a class="el" href="struct_vma_allocation_info.html#a28612f3e897e5b268254a3c63413d759" title="Custom allocation name that was set with vmaSetAllocationName().">VmaAllocationInfo::pName</a>. It is also printed in JSON report created by <a class="el" href="group__group__stats.html#gaa4fee7eb5253377599ef4fd38c93c2a0" title="Builds and returns statistics as a null-terminated string in JSON format.">vmaBuildStatsString()</a>.</p> |
| 109 | +<dl class="section note"><dt>Note</dt><dd>Setting string name to VMA allocation doesn't automatically set it to the Vulkan buffer or image created with it. You must do it manually using an extension like VK_EXT_debug_utils, which is independent of this library. </dd></dl> |
127 | 110 | </div></div><!-- contents --> |
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