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descriptor\n",{"type":1873,"tag":2163,"props":16455,"children":16456},{"class":2165,"line":190},[16457,16461,16465,16469,16473],{"type":1873,"tag":2163,"props":16458,"children":16459},{"style":2180},[16460],{"type":1878,"value":16082},{"type":1873,"tag":2163,"props":16462,"children":16463},{"style":3995},[16464],{"type":1878,"value":10585},{"type":1873,"tag":2163,"props":16466,"children":16467},{"style":2180},[16468],{"type":1878,"value":16091},{"type":1873,"tag":2163,"props":16470,"children":16471},{"style":2169},[16472],{"type":1878,"value":3987},{"type":1873,"tag":2163,"props":16474,"children":16475},{"style":2180},[16476],{"type":1878,"value":16477}," D3D12_ROOT_PARAMETER_TYPE_UAV;\n",{"type":1873,"tag":2163,"props":16479,"children":16480},{"class":2165,"line":194},[16481,16485,16489,16494,16498,16503],{"type":1873,"tag":2163,"props":16482,"children":16483},{"style":2180},[16484],{"type":1878,"value":16082},{"type":1873,"tag":2163,"props":16486,"children":16487},{"style":3995},[16488],{"type":1878,"value":10585},{"type":1873,"tag":2163,"props":16490,"children":16491},{"style":2180},[16492],{"type":1878,"value":16493},"].Descriptor.ShaderRegister             ",{"type":1873,"tag":2163,"props":16495,"children":16496},{"style":2169},[16497],{"type":1878,"value":3987},{"type":1873,"tag":2163,"props":16499,"children":16500},{"style":3995},[16501],{"type":1878,"value":16502}," 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descriptor\n",{"type":1873,"tag":2163,"props":16551,"children":16552},{"class":2165,"line":210},[16553,16557,16561,16565,16569],{"type":1873,"tag":2163,"props":16554,"children":16555},{"style":2180},[16556],{"type":1878,"value":16082},{"type":1873,"tag":2163,"props":16558,"children":16559},{"style":3995},[16560],{"type":1878,"value":11156},{"type":1873,"tag":2163,"props":16562,"children":16563},{"style":2180},[16564],{"type":1878,"value":16091},{"type":1873,"tag":2163,"props":16566,"children":16567},{"style":2169},[16568],{"type":1878,"value":3987},{"type":1873,"tag":2163,"props":16570,"children":16571},{"style":2180},[16572],{"type":1878,"value":16573}," D3D12_ROOT_PARAMETER_TYPE_CBV;\n",{"type":1873,"tag":2163,"props":16575,"children":16576},{"class":2165,"line":214},[16577,16581,16585,16589,16593,16598],{"type":1873,"tag":2163,"props":16578,"children":16579},{"style":2180},[16580],{"type":1878,"value":16082},{"type":1873,"tag":2163,"props":16582,"children":16583},{"style":3995},[16584],{"type":1878,"value":11156},{"type":1873,"tag":2163,"props":16586,"children":16587},{"style":2180},[16588],{"type":1878,"value":16493},{"type":1873,"tag":2163,"props":16590,"children":16591},{"style":2169},[16592],{"type":1878,"value":3987},{"type":1873,"tag":2163,"props":16594,"children":16595},{"style":3995},[16596],{"type":1878,"value":16597}," 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Vulkan:",{"type":1873,"tag":2151,"props":16746,"children":16748},{"className":2153,"code":16747,"language":2155,"meta":2156,"style":2156},"const VkSpirvResourceTypeFlagsEXT srvMask = VK_SPIRV_RESOURCE_TYPE_SAMPLED_IMAGE_BIT_EXT |\n                                            VK_SPIRV_RESOURCE_TYPE_READ_ONLY_IMAGE_BIT_EXT |\n                                            VK_SPIRV_RESOURCE_TYPE_READ_ONLY_STORAGE_BUFFER_BIT_EXT |\n                                            VK_SPIRV_RESOURCE_TYPE_ACCELERATION_STRUCTURE_BIT_EXT;\nconst VkSpirvResourceTypeFlagsEXT samplerMask = VK_SPIRV_RESOURCE_TYPE_SAMPLER_BIT_EXT;\nconst VkSpirvResourceTypeFlagsEXT uavMask = VK_SPIRV_RESOURCE_TYPE_READ_WRITE_IMAGE_BIT_EXT |\n                                            VK_SPIRV_RESOURCE_TYPE_READ_WRITE_STORAGE_BUFFER_BIT_EXT;\nconst VkSpirvResourceTypeFlagsEXT cbvMask = VK_SPIRV_RESOURCE_TYPE_UNIFORM_BUFFER_BIT_EXT;\n\nVkDescriptorSetAndBindingMappingEXT mappings[6];\n\n// Descriptor Table 0\nmappings[0].sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_AND_BINDING_MAPPING_EXT,\nmappings[0].descriptorSet = 1;                          // Equivalent to RegisterSpace\nmappings[0].bindingCount = 5;                           // Equivalent to NumDescriptors\nmappings[0].firstBinding = 3;                           // Equivalent to BaseShaderRegister\nmappings[0].resourceMask = srvMask;\nmappings[0].source = VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT;\nmappings[0].sourceData.pushIndex.heapOffset = 0;        // Equivalent to OffsetInDescriptorsFromTableStart\nmappings[0].sourceData.pushIndex.heapIndexStride = 1;   // Push data is a byte offset\nmappings[0].sourceData.pushIndex.pushOffset = 128;      // No grouping of descriptor tables, so entries for the same table map to the same push constant offset.\n\n// Descriptor Table 1\nmappings[1].sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_AND_BINDING_MAPPING_EXT,\nmappings[1].descriptorSet = 0;                          // Equivalent to RegisterSpace\nmappings[1].bindingCount = 6;                           // Equivalent to NumDescriptors\nmappings[1].firstBinding = 19;                          // Equivalent to BaseShaderRegister\nmappings[1].resourceMask = uavMask;\nmappings[1].source = VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT;\nmappings[1].sourceData.pushIndex.heapOffset = 200 * imageDescriptorSize;   // Equivalent to OffsetInDescriptorsFromTableStart\nmappings[1].sourceData.pushIndex.heapIndexStride = 1;   // Push data is a byte offset\nmappings[1].sourceData.pushIndex.pushOffset = 132;      // No grouping of descriptor tables, so entries for the same table map to the same push constant offset.\n\nmappings[2].sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_AND_BINDING_MAPPING_EXT,\nmappings[2].descriptorSet = 3;                          // Equivalent to RegisterSpace\nmappings[2].bindingCount = 1;                           // Equivalent to NumDescriptors\nmappings[2].firstBinding = 3;                           // Equivalent to BaseShaderRegister\nmappings[2].resourceMask = srvMask;\nmappings[2].source = VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT;\nmappings[2].sourceData.pushIndex.heapOffset = 50 * imageDescriptorSize;    // Equivalent to OffsetInDescriptorsFromTableStart\nmappings[2].sourceData.pushIndex.heapIndexStride = 1;   // Push data is a byte offset\nmappings[2].sourceData.pushIndex.pushOffset = 132;  // No grouping of descriptor tables, so entries for the same table map to the same push constant offset.\n\n// Root Constants\nmappings[3].sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_AND_BINDING_MAPPING_EXT,\nmappings[3].descriptorSet = 2;                      // Equivalent to RegisterSpace\nmappings[3].bindingCount = 1;                       // Always maps to a single CBV declaration in HLSL\nmappings[3].firstBinding = 100;                     // Equivalent to ShaderRegister\nmappings[3].resourceMask = cbvMask;\nmappings[3].source = VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_DATA_EXT;\nmappings[3].sourceData.pushDataOffset = 0;          // Set to a user-specified offset. No need to say how many there are here.\n\n// Root UAV descriptor\nmappings[4].sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_AND_BINDING_MAPPING_EXT,\nmappings[4].descriptorSet = 2;                      // Equivalent to RegisterSpace\nmappings[4].bindingCount = 1;                       // Always maps to a single resource declaration in HLSL\nmappings[4].firstBinding = 101;                     // Equivalent to ShaderRegister\nmappings[4].resourceMask = uavMask;\nmappings[4].source = VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_ADDRESS_EXT;\nmappings[4].sourceData.pushAddressOffset = 8;       // Set to a user-specified offset.\n\n// Root CBV descriptor\nmappings[5].sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_AND_BINDING_MAPPING_EXT,\nmappings[5].descriptorSet = 2;                      // Equivalent to RegisterSpace\nmappings[5].bindingCount = 1;                       // Always maps to a single resource declaration in HLSL\nmappings[5].firstBinding = 102;                     // Equivalent to ShaderRegister\nmappings[5].resourceMask = vbvMask;\nmappings[5].source = VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_ADDRESS_EXT;\nmappings[5].sourceData.pushAddressOffset = 16;       // Set to a user-specified offset.\n\nVkShaderDescriptorSetAndBindingMappingInfoEXT rootSignatureDesc = {\n    .sType = VK_STRUCTURE_TYPE_SHADER_DESCRIPTOR_SET_AND_BINDING_MAPPING_INFO_EXT,\n    .pNext = NULL,\n    .mappingCount = 6,\n    .pMappings = mappings};\n",[16749],{"type":1873,"tag":2159,"props":16750,"children":16751},{"__ignoreMap":2156},[16752,16777,16789,16801,16809,16830,16855,16863,16884,16891,16915,16922,16929,16957,16994,17031,17067,17096,17124,17160,17196,17232,17239,17246,17273,17308,17343,17380,17408,17435,17477,17512,17547,17554,17581,17616,17651,17686,17713,17740,17781,17816,17852,17859,17866,17893,17929,17965,18001,18029,18057,18094,18101,18108,18135,18170,18206,18241,18268,18296,18333,18340,18347,18374,18409,18444,18479,18507,18534,18570,18577,18593,18608,18627,18646],{"type":1873,"tag":2163,"props":16753,"children":16754},{"class":2165,"line":10},[16755,16759,16764,16768,16773],{"type":1873,"tag":2163,"props":16756,"children":16757},{"style":2169},[16758],{"type":1878,"value":11082},{"type":1873,"tag":2163,"props":16760,"children":16761},{"style":2180},[16762],{"type":1878,"value":16763}," VkSpirvResourceTypeFlagsEXT srvMask 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  %buffer_size = OpConstantSizeOfEXT %size_type %placeholder_buffer_type\n",{"type":1873,"tag":2163,"props":18885,"children":18886},{"class":2165,"line":46},[18887],{"type":1873,"tag":2163,"props":18888,"children":18889},{},[18890],{"type":1878,"value":18891},"               %image_is_bigger = OpSpecConstantOp OpUGreaterThan %boolean_type %image_size %buffer_size\n",{"type":1873,"tag":2163,"props":18893,"children":18894},{"class":2165,"line":50},[18895],{"type":1873,"tag":2163,"props":18896,"children":18897},{},[18898],{"type":1878,"value":18899},"                 %resource_size = OpSpecConstantOp OpSelect %size_type %image_is_bigger %image_size %buffer_size\n",{"type":1873,"tag":2163,"props":18901,"children":18902},{"class":2165,"line":54},[18903],{"type":1873,"tag":2163,"props":18904,"children":18905},{},[18906],{"type":1878,"value":18907},"      %uniformconstant_ptr_type = OpTypeUntypedPointerKHR 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%float4_type 1 2 0 0 0 1 Unknown\n",{"type":1873,"tag":2163,"props":18939,"children":18940},{"class":2165,"line":74},[18941],{"type":1873,"tag":2163,"props":18942,"children":18943},{},[18944],{"type":1878,"value":18945},"                     %myTexture = OpLoad %texture2D_float4_type %myTexture_ptr\n",{"type":1873,"tag":1874,"props":18947,"children":18948},{},[18949],{"type":1878,"value":18950},"Similarly, the following hlsl code retrieving a constant buffer:",{"type":1873,"tag":2151,"props":18952,"children":18954},{"className":18785,"code":18953,"language":18787,"meta":2156,"style":2156},"struct MyStruct {\n    uint placeholder;\n    uint value;\n};\n\nConstantBuffer\u003CMyStruct> myCBuffer = ResourceDescriptorHeap[bufIdx];\n\nint myValue = myCBuffer.value;\n",[18955],{"type":1873,"tag":2159,"props":18956,"children":18957},{"__ignoreMap":2156},[18958,18966,18974,18982,18989,18996,19004,19011],{"type":1873,"tag":2163,"props":18959,"children":18960},{"class":2165,"line":10},[18961],{"type":1873,"tag":2163,"props":18962,"children":18963},{},[18964],{"type":1878,"value":18965},"struct MyStruct {\n",{"type":1873,"tag":2163,"props":18967,"children":18968},{"class":2165,"line":14},[18969],{"type":1873,"tag":2163,"props":18970,"children":18971},{},[18972],{"type":1878,"value":18973},"    uint placeholder;\n",{"type":1873,"tag":2163,"props":18975,"children":18976},{"class":2165,"line":18},[18977],{"type":1873,"tag":2163,"props":18978,"children":18979},{},[18980],{"type":1878,"value":18981},"    uint value;\n",{"type":1873,"tag":2163,"props":18983,"children":18984},{"class":2165,"line":22},[18985],{"type":1873,"tag":2163,"props":18986,"children":18987},{},[18988],{"type":1878,"value":12777},{"type":1873,"tag":2163,"props":18990,"children":18991},{"class":2165,"line":26},[18992],{"type":1873,"tag":2163,"props":18993,"children":18994},{"emptyLinePlaceholder":232},[18995],{"type":1878,"value":2225},{"type":1873,"tag":2163,"props":18997,"children":18998},{"class":2165,"line":30},[18999],{"type":1873,"tag":2163,"props":19000,"children":19001},{},[19002],{"type":1878,"value":19003},"ConstantBuffer\u003CMyStruct> myCBuffer = ResourceDescriptorHeap[bufIdx];\n",{"type":1873,"tag":2163,"props":19005,"children":19006},{"class":2165,"line":34},[19007],{"type":1873,"tag":2163,"props":19008,"children":19009},{"emptyLinePlaceholder":232},[19010],{"type":1878,"value":2225},{"type":1873,"tag":2163,"props":19012,"children":19013},{"class":2165,"line":38},[19014],{"type":1873,"tag":2163,"props":19015,"children":19016},{},[19017],{"type":1878,"value":19018},"int myValue = myCBuffer.value;\n",{"type":1873,"tag":1874,"props":19020,"children":19021},{},[19022],{"type":1878,"value":18803},{"type":1873,"tag":2151,"props":19024,"children":19026},{"className":18806,"code":19025,"language":18808,"meta":2156,"style":2156},"                                  OpDecorateId %placeholder_buffer_array_type ArrayStrideIdEXT %resource_size\n\n                     %void_type = OpTypeVoid\n                     %size_type = OpTypeInt 32 0\n        %placeholder_image_type = OpTypeImage %void_type 2D 2 0 0 0 Unknown\n       %placeholder_buffer_type = OpTypeBufferEXT Uniform\n %placeholder_buffer_array_type = OpTypeRuntimeArray %placeholder_buffer_type\n                    %image_size = OpConstantSizeOfEXT %size_type %placeholder_image_type\n                   %buffer_size = OpConstantSizeOfEXT %size_type %placeholder_buffer_type\n               %image_is_bigger = OpSpecConstantOp OpUGreaterThan %boolean_type %image_size %buffer_size\n                 %resource_size = OpSpecConstantOp OpSelect %size_type %image_is_bigger %image_size %buffer_size\n         %cbuffer_data_ptr_type = OpTypeUntypedPointerKHR Uniform\n      %uniformconstant_ptr_type = OpTypeUntypedPointerKHR UniformConstant\n\n                 %myCBuffer_ptr = OpUntypedAccessChainKHR %uniformconstant_ptr_type %placeholder_buffer_array_type %resource_heap %bufIdx\n              %cbuffer_data_ptr = OpBufferPointerEXT %cbuffer_data_ptr_type %myCBuffer_ptr\n\n                 %mystruct_type = OpTypeStruct %uint32_type %uint32_type\n            %mystruct_value_ptr = OpUntypedAccessChainKHR %cbuffer_data_ptr_type %mystruct_type %cbuffer_data_ptr 1\n                       %myValue = OpLoad %uint32_type %mystruct_value_ptr\n",[19027],{"type":1873,"tag":2159,"props":19028,"children":19029},{"__ignoreMap":2156},[19030,19038,19045,19052,19059,19066,19073,19081,19088,19095,19102,19109,19117,19124,19131,19139,19147,19154,19162,19170],{"type":1873,"tag":2163,"props":19031,"children":19032},{"class":2165,"line":10},[19033],{"type":1873,"tag":2163,"props":19034,"children":19035},{},[19036],{"type":1878,"value":19037},"                                  OpDecorateId %placeholder_buffer_array_type ArrayStrideIdEXT 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%placeholder_buffer_array_type = OpTypeRuntimeArray %placeholder_buffer_type\n",{"type":1873,"tag":2163,"props":19082,"children":19083},{"class":2165,"line":38},[19084],{"type":1873,"tag":2163,"props":19085,"children":19086},{},[19087],{"type":1878,"value":18875},{"type":1873,"tag":2163,"props":19089,"children":19090},{"class":2165,"line":42},[19091],{"type":1873,"tag":2163,"props":19092,"children":19093},{},[19094],{"type":1878,"value":18883},{"type":1873,"tag":2163,"props":19096,"children":19097},{"class":2165,"line":46},[19098],{"type":1873,"tag":2163,"props":19099,"children":19100},{},[19101],{"type":1878,"value":18891},{"type":1873,"tag":2163,"props":19103,"children":19104},{"class":2165,"line":50},[19105],{"type":1873,"tag":2163,"props":19106,"children":19107},{},[19108],{"type":1878,"value":18899},{"type":1873,"tag":2163,"props":19110,"children":19111},{"class":2165,"line":54},[19112],{"type":1873,"tag":2163,"props":19113,"children":19114},{},[19115],{"type":1878,"value":19116},"         %cbuffer_data_ptr_type = 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%cbuffer_data_ptr_type %myCBuffer_ptr\n",{"type":1873,"tag":2163,"props":19148,"children":19149},{"class":2165,"line":74},[19150],{"type":1873,"tag":2163,"props":19151,"children":19152},{"emptyLinePlaceholder":232},[19153],{"type":1878,"value":2225},{"type":1873,"tag":2163,"props":19155,"children":19156},{"class":2165,"line":78},[19157],{"type":1873,"tag":2163,"props":19158,"children":19159},{},[19160],{"type":1878,"value":19161},"                 %mystruct_type = OpTypeStruct %uint32_type %uint32_type\n",{"type":1873,"tag":2163,"props":19163,"children":19164},{"class":2165,"line":82},[19165],{"type":1873,"tag":2163,"props":19166,"children":19167},{},[19168],{"type":1878,"value":19169},"            %mystruct_value_ptr = OpUntypedAccessChainKHR %cbuffer_data_ptr_type %mystruct_type %cbuffer_data_ptr 1\n",{"type":1873,"tag":2163,"props":19171,"children":19172},{"class":2165,"line":86},[19173],{"type":1873,"tag":2163,"props":19174,"children":19175},{},[19176],{"type":1878,"value":19177},"                       %myValue = OpLoad %uint32_type %mystruct_value_ptr\n",{"type":1873,"tag":2025,"props":19179,"children":19180},{},[19181,19186],{"type":1873,"tag":1874,"props":19182,"children":19183},{},[19184],{"type":1878,"value":19185},"This matches native DirectX 12’s handling of descriptors, where all resource types are the same size. For implementations where these descriptors are not the same size, this wastes significant space in the heap and may increase cache pressure unnecessarily.",{"type":1873,"tag":1874,"props":19187,"children":19188},{},[19189],{"type":1878,"value":19190},"HLSL and existing HLSL compilers do not currently have a method to alter this indexing, and one should be considered, but that will be handled as a separate proposal.",{"type":1873,"tag":1880,"props":19192,"children":19194},{"id":19193},"_issues",[19195],{"type":1878,"value":19196},"Issues",{"type":1873,"tag":2079,"props":19198,"children":19200},{"id":19199},"_is_this_the_same_as_directx_12_descriptor_heaps",[19201],{"type":1878,"value":19202},"Is this the same as DirectX 12 descriptor heaps?",{"type":1873,"tag":1874,"props":19204,"children":19205},{},[19206,19213,19215,19220],{"type":1873,"tag":1921,"props":19207,"children":19210},{"href":19208,"rel":19209},"https://learn.microsoft.com/en-us/windows/win32/direct3d12/descriptor-heaps-overview",[1925],[19211],{"type":1878,"value":19212},"DirectX 12 also features something called descriptor heaps",{"type":1878,"value":19214},".\nThe \"descriptor heap\" name is not an accident – it was deliberately chosen to capture this similarity and indicate architectural compatibility.\nHowever, while you can drive Vulkan’s descriptor heaps in the same way as you would drive DirectX 12’s descriptor heaps (",{"type":1873,"tag":1921,"props":19216,"children":19217},{"href":2120},[19218],{"type":1878,"value":19219},"which was something we explicitly designed them for",{"type":1878,"value":19221},"), Vulkan’s are also significantly more flexible.",{"type":1873,"tag":1874,"props":19223,"children":19224},{},[19225],{"type":1878,"value":19226},"DirectX 12’s heaps are an object — a thing that you create descriptors inside of, with the nitty-gritty details of what goes on under the hood hidden behind the runtime and the driver.\nTo do things like copy descriptors between or within heaps, you need to call a function.\nIf you want to stage descriptors on the host, you need a specially created heap to do so.\nFor any action you want to perform with a descriptor, a purpose-built API is required.",{"type":1873,"tag":1874,"props":19228,"children":19229},{},[19230],{"type":1878,"value":19231},"Vulkan’s descriptor heaps, on the other hand, are just a specially identified region of memory, and descriptors are just bags of bits.\nIf you want to copy descriptors around, call memcpy; or do it on the GPU.\nTo stage descriptors on the host, just stow them in host memory anywhere you want and copy them the same way you would copy any other plain old data.",{"type":1873,"tag":1874,"props":19233,"children":19234},{},[19235],{"type":1878,"value":19236},"You are also free to use the heap’s memory to store whatever else you want.\nFor example, you can store constant data next to your descriptors for a material, rather than using a separate allocation, which can be more cache efficient on a number of implementations.\nYou can even use that same memory as a storage buffer with read/write access if you want.\nJust be aware that you need to issue an API barrier between writing to the heap on the device and reading from the heap in a shader.",{"type":1873,"tag":1874,"props":19238,"children":19239},{},[19240,19242,19249],{"type":1878,"value":19241},"There are some restrictions simply because not all implementations can handle descriptors coming from arbitrary memory.\nDescriptors used in shaders must come from a heap; they cannot be stored in arbitrary buffers.\nThe application should also expect a high cost to switch between heaps on some implementations, ",{"type":1873,"tag":1921,"props":19243,"children":19246},{"href":19244,"rel":19245},"https://learn.microsoft.com/en-us/windows/win32/api/d3d12/nf-d3d12-id3d12graphicscommandlist-setdescriptorheaps#remarks",[1925],[19247],{"type":1878,"value":19248},"just as in DirectX 12",{"type":1878,"value":2077},{"type":1873,"tag":2079,"props":19251,"children":19253},{"id":19252},"_do_i_need_to_change_all_my_shaders_to_use_this",[19254],{"type":1878,"value":19255},"Do I need to change all my shaders to use this?",{"type":1873,"tag":1874,"props":19257,"children":19258},{},[19259],{"type":1878,"value":19260},"Nope!",{"type":1873,"tag":1874,"props":19262,"children":19263},{},[19264],{"type":1878,"value":19265},"This extension has been carefully and deliberately designed to work with your existing SPIR-V shaders, but also includes adaptations to improve compatibility with existing shading languages if/when you do wish to recompile your shaders.\nThere are other benefits to recompiling your shaders to use the new SPIR-V extension, but this is not necessary to start using the API features.",{"type":1873,"tag":1874,"props":19267,"children":19268},{},[19269],{"type":1878,"value":19270},"Descriptor heaps can be interacted with in two ways: By direct access to heaps and push data or through a flexible mapping system in the API that maps shader bindings to heap entries, push data, or device addresses.",{"type":1873,"tag":1874,"props":19272,"children":19273},{},[19274,19276,19281,19283,19288],{"type":1878,"value":19275},"For shaders using bindings, the extension introduces a ",{"type":1873,"tag":1921,"props":19277,"children":19278},{"href":2128},[19279],{"type":1878,"value":19280},"flexible mapping system",{"type":1878,"value":19282}," that enables existing SPIR-V shaders to be used as-is, without requiring recompilation or shader edits.\nHowever, as part of the design work, we made sure that the mapping system was not just 1:1 with descriptor set layouts, but instead catered to a wide variety of API and shader binding models, both for porting and for emulation of other APIs.\nFor instance, the ",{"type":1873,"tag":1921,"props":19284,"children":19285},{"href":2120},[19286],{"type":1878,"value":19287},"HLSL binding model now works without needing any Vulkan-specific workarounds",{"type":1878,"value":19289},", which has been a longstanding developer pain point with using HLSL on Vulkan.",{"type":1873,"tag":1874,"props":19291,"children":19292},{},[19293,19295,19300],{"type":1878,"value":19294},"The direct access approach requires applications to recompile their shaders, making use of the new ",{"type":1873,"tag":2159,"props":19296,"children":19298},{"className":19297},[],[19299],{"type":1878,"value":14631},{"type":1878,"value":19301}," extension.\nThis extension provides a pointer for each heap, allowing simple access to each, and notably matching 1:1 with HLSL’s Dynamic Resources.\nThere is also a GLSL extension to allow declared arrays of descriptors to access the descriptor heap without shader bindings.",{"type":1873,"tag":1874,"props":19303,"children":19304},{},[19305],{"type":1878,"value":19306},"While it is not possible to mix and match legacy descriptor set layouts and anything based on them with heaps, mixing and matching the use of bindings and direct heap access in your shaders works just fine with the mapping API.\nSo you can gradually start introducing heap access to shaders with bindings, rather than having to rewrite all of your shaders to make use of this new extension.",{"type":1873,"tag":1874,"props":19308,"children":19309},{},[19310],{"type":1878,"value":19311},"The ultimate aim here is that you should be able to take a shader, compiled from any shading language, and use it without worrying about how to make it work with Vulkan.\nThe interface between the API and your shaders is now yours to define.",{"type":1873,"tag":2079,"props":19313,"children":19315},{"id":19314},"_does_exposing_all_of_this_make_debugging_invalid_descriptors_worse",[19316],{"type":1878,"value":19317},"Does exposing all of this make debugging invalid descriptors worse?",{"type":1873,"tag":1874,"props":19319,"children":19320},{},[19321],{"type":1878,"value":19322},"With GPU copies, control over where in memory a descriptor is being accessed, and responsibility for actually putting the bits in memory, there are more ways than ever to end up in a situation with an invalid descriptor.\nThe good news is that none of this really makes debugging worse than it already is - validating a descriptor has been at point of use since we introduced dynamic indexing.\nThe work that validation layers already do for descriptor indexing will be being reworked for this extension, which should provide a seamless debugging experience.",{"type":1873,"tag":1874,"props":19324,"children":19325},{},[19326,19328,19334],{"type":1878,"value":19327},"Work to ",{"type":1873,"tag":1921,"props":19329,"children":19331},{"href":19330},"/404#_better_debugging",[19332],{"type":1878,"value":19333},"improve debugging for descriptors",{"type":1878,"value":19335}," is ongoing.",{"type":1873,"tag":2079,"props":19337,"children":19339},{"id":19338},"_how_does_ycbcr_sampling_work_with_the_bindless_interface",[19340,19342,19346,19347,19351],{"type":1878,"value":19341},"How does YC",{"type":1873,"tag":3263,"props":19343,"children":19344},{},[19345],{"type":1878,"value":3267},{"type":1878,"value":3269},{"type":1873,"tag":3263,"props":19348,"children":19349},{},[19350],{"type":1878,"value":3274},{"type":1878,"value":19352}," sampling work with the bindless interface?",{"type":1873,"tag":1874,"props":19354,"children":19355},{},[19356,19358,19363],{"type":1878,"value":19357},"For now it still requires set and binding, mapping to shader combined image samplers.\nA number of image descriptors will be consumed for each such resource, according to ",{"type":1873,"tag":1921,"props":19359,"children":19361},{"href":3369,"rel":19360},[1925],[19362],{"type":1878,"value":3373},{"type":1878,"value":2077},{"type":1873,"tag":2079,"props":19365,"children":19367},{"id":19366},"_how_does_sampling_of_subsampled_images_for_fragment_density_maps_work_with_the_bindless_interface",[19368],{"type":1878,"value":19369},"How does sampling of subsampled images for fragment density maps work with the bindless interface?",{"type":1873,"tag":1874,"props":19371,"children":19372},{},[19373,19374,19380],{"type":1878,"value":19357},{"type":1873,"tag":2159,"props":19375,"children":19377},{"className":19376},[],[19378],{"type":1878,"value":19379},"VkSubsampledImageFormatPropertiesEXT::subsampledImageDescriptorCount",{"type":1878,"value":2077},{"type":1873,"tag":2079,"props":19382,"children":19384},{"id":19383},"_should_embedded_samplers_be_passed_as_descriptors_rather_than_create_infos",[19385],{"type":1878,"value":19386},"Should embedded samplers be passed as descriptors rather than create infos?",{"type":1873,"tag":1874,"props":19388,"children":19389},{},[19390],{"type":1878,"value":19391},"No.",{"type":1873,"tag":1874,"props":19393,"children":19394},{},[19395,19397,19401,19402,19406],{"type":1878,"value":19396},"Part of the reason for embedded samplers being passed to shader/pipeline create info is to allow for them to be baked into shaders where viable; for things like YC",{"type":1873,"tag":3263,"props":19398,"children":19399},{},[19400],{"type":1878,"value":3267},{"type":1878,"value":3269},{"type":1873,"tag":3263,"props":19403,"children":19404},{},[19405],{"type":1878,"value":3274},{"type":1878,"value":19407}," sampling, this might include information that is not directly in the sampler descriptor.",{"type":1873,"tag":2079,"props":19409,"children":19411},{"id":19410},"_why_is_there_an_explicit_custom_border_color_registration",[19412],{"type":1878,"value":19413},"Why is there an explicit custom border color registration?",{"type":1873,"tag":1874,"props":19415,"children":19416},{},[19417],{"type":1878,"value":19418},"Some implementations maintain a table of border colors rather than embedding them directly in the sampler.\nWhen sampler objects are created prior to this extension, registration happens under the covers when a sampler object is created or destroyed; without sampler objects, this needs to be exposed.",{"type":1873,"tag":2079,"props":19420,"children":19422},{"id":19421},"_should_descriptor_layout_compatibility_be_a_separate_extension",[19423],{"type":1878,"value":19424},"Should descriptor layout compatibility be a separate extension?",{"type":1873,"tag":1874,"props":19426,"children":19427},{},[19428,19430,19434,19435,19439],{"type":1878,"value":19429},"No, on the basis that it is currently necessary in order to use YC",{"type":1873,"tag":3263,"props":19431,"children":19432},{},[19433],{"type":1878,"value":3267},{"type":1878,"value":3269},{"type":1873,"tag":3263,"props":19436,"children":19437},{},[19438],{"type":1878,"value":3274},{"type":1878,"value":19440}," sampling and input attachments.\nIt is also expected that a significant portion of existing content (particularly via emulation layers) will make use of it.",{"type":1873,"tag":2079,"props":19442,"children":19444},{"id":19443},"_what_are_the_indexing_rules_when_using_descriptor_heaps",[19445],{"type":1878,"value":19446},"What are the indexing rules when using descriptor heaps?",{"type":1873,"tag":1874,"props":19448,"children":19449},{},[19450,19452,19458],{"type":1878,"value":19451},"They are largely the same as ",{"type":1873,"tag":1921,"props":19453,"children":19456},{"href":19454,"rel":19455},"https://docs.vulkan.org/spec/latest/appendices/extensions.html#VK_EXT_descriptor_indexing",[1925],[19457],{"type":1878,"value":519},{"type":1878,"value":19459}," with all features enabled - indexing may be non-uniform, but does not need the expression to be tagged as non-uniform.",{"type":1873,"tag":2079,"props":19461,"children":19463},{"id":19462},"_how_are_embedded_samplers_handled_on_implementations_that_cannot_embed_them_in_shader_constant_data",[19464],{"type":1878,"value":19465},"How are embedded samplers handled on implementations that cannot embed them in shader constant data?",{"type":1873,"tag":1874,"props":19467,"children":19468},{},[19469],{"type":1878,"value":19470},"For implementations that need to store samplers in a sampler heap of some form, the reserved range of each sampler heap will need to accommodate any embedded samplers created by the application.\nAs the total number of unique embedded samplers that can exist is limited, implementations can store these statically, but will need to de-duplicate any samplers with the same create info across multiple pipelines.",{"type":1873,"tag":2079,"props":19472,"children":19474},{"id":19473},"_why_is_so_much_state_baked_in_when_using_vk_ext_shader_object_with_bindings",[19475],{"type":1878,"value":19476},"Why is so much state baked in when using VK_EXT_shader_object with bindings?",{"type":1873,"tag":1874,"props":19478,"children":19479},{},[19480],{"type":1878,"value":19481},"Shader object largely did away with the idea of static state, but in the case of descriptor layouts this \"state\" is really a set of constant shader offsets baked into the shader; which is why the pipeline layout was included in shader object creation in the base extension.\nWhile all of these offsets could probably be made fully dynamic, doing so would come at a significant and unexpected performance penalty compared to using a pipeline layout.\nIf an application really wants fully dynamic offsets then they can do so by not using the mappings, and instead using the heaps directly.",{"type":1873,"tag":2079,"props":19483,"children":19485},{"id":19484},"_why_is_there_a_multiple_sampler_limit_for_samplers_with_ycbcr_conversion",[19486,19488,19492,19493,19497],{"type":1878,"value":19487},"Why is there a multiple sampler limit for samplers with YC",{"type":1873,"tag":3263,"props":19489,"children":19490},{},[19491],{"type":1878,"value":3267},{"type":1878,"value":3269},{"type":1873,"tag":3263,"props":19494,"children":19495},{},[19496],{"type":1878,"value":3274},{"type":1878,"value":19498}," conversion?",{"type":1873,"tag":1874,"props":19500,"children":19501},{},[19502],{"type":1878,"value":19503},"Implementations can currently hide if they use multiple samplers behind multiple combined image samplers. This extension does not allow for that, so a separate limit has been added.",{"type":1873,"tag":2079,"props":19505,"children":19507},{"id":19506},"_why_do_the_heaps_have_reserved_ranges",[19508],{"type":1878,"value":19509},"Why do the heaps have reserved ranges?",{"type":1873,"tag":1874,"props":19511,"children":19512},{},[19513],{"type":1878,"value":19514},"Implementations need descriptors for various operations that may not be directly apparent - for instance, blit operations implemented as a shader need access to descriptors for the images involved and a sampler descriptor to sample the source image.\nSome operations may also require additional pointers to data, such as the shader resource buffers for ray tracing or scratch memory for acceleration structure builds; if an implementation has limited push data space then this space is available to manage buffer descriptors for this purpose.",{"type":1873,"tag":2079,"props":19516,"children":19518},{"id":19517},"_is_it_possible_to_map_input_attachments_without_shader_bindings",[19519],{"type":1878,"value":19520},"Is it possible to map input attachments without shader bindings?",{"type":1873,"tag":1874,"props":19522,"children":19523},{},[19524],{"type":1878,"value":19525},"No - right now they need to be mapped as they always have been and shader bindings used to set them up.\nIt would be possible to just add a heap offset as a constant to make this work, but that is not strictly an improvement.\nFuture extensions could consider how to make this interaction cleaner.",{"type":1873,"tag":2079,"props":19527,"children":19529},{"id":19528},"_why_does_vk_nv_device_generated_commands_have_a_specific_token_for_push_data_but_vk_ext_device_generated_commands_does_not",[19530],{"type":1878,"value":19531},"Why does VK_NV_device_generated_commands have a specific token for push data but VK_EXT_device_generated_commands does not?",{"type":1873,"tag":1874,"props":19533,"children":19534},{},[19535],{"type":1878,"value":19536},"It largely just boils down to the fact that the two extensions expressed tokens differently.\nAs a result, the EXT just reuses the push constant token, whereas the NV extension gets a new token.\nThe NV extension smooshed all tokens into a monolithic structure, so having push constants sometimes being push data would add significant complexity to validation; so having a separate token along the lines of other extensions made sense.\nWith the EXT, the tokens are isolated structures in a union, so the valid usage was much simpler to spell out, and so the token would have just been an alias anyway.",{"type":1873,"tag":2079,"props":19538,"children":19540},{"id":19539},"_can_different_shader_stages_in_the_same_pipelinedraw_use_different_resource_mappings",[19541],{"type":1878,"value":19542},"Can different shader stages in the same pipeline/draw use different resource mappings?",{"type":1873,"tag":1874,"props":19544,"children":19545},{},[19546],{"type":1878,"value":19547},"Yes! There is no cross stage validation for the mappings set by a user; as long as an application ensures that the descriptors they use are where they expect them to be for each shader, the mappings can be set however the developer wishes.",{"type":1873,"tag":2079,"props":19549,"children":19551},{"id":19550},"_why_is_the_vkresourcedescriptordataext_a_union_of_pointers_instead_of_a_flat_union",[19552,19554,19559],{"type":1878,"value":19553},"Why is the ",{"type":1873,"tag":2159,"props":19555,"children":19557},{"className":19556},[],[19558],{"type":1878,"value":7585},{"type":1878,"value":19560}," a union of pointers instead of a flat union?",{"type":1873,"tag":1874,"props":19562,"children":19563},{},[19564,19566,19571,19573,19578],{"type":1878,"value":19565},"So that each pointer can be set to ",{"type":1873,"tag":2159,"props":19567,"children":19569},{"className":19568},[],[19570],{"type":1878,"value":4131},{"type":1878,"value":19572}," to define a \"null descriptor\" when interacting with ",{"type":1873,"tag":2159,"props":19574,"children":19576},{"className":19575},[],[19577],{"type":1878,"value":828},{"type":1878,"value":2077},{"type":1873,"tag":2079,"props":19580,"children":19582},{"id":19581},"_how_can_i_use_debug_labels_with_descriptor_heaps",[19583],{"type":1878,"value":19584},"How can I use debug labels with descriptor heaps?",{"type":1873,"tag":1874,"props":19586,"children":19587},{},[19588,19590,19595,19597,19602,19603,19608],{"type":1878,"value":19589},"Labels can be associated with patterns of descriptor bits when they are written, or with embedded samplers during pipeline creation, by chaining ",{"type":1873,"tag":1921,"props":19591,"children":19593},{"href":10958,"rel":19592},[1925],[19594],{"type":1878,"value":10962},{"type":1878,"value":19596}," structures into ",{"type":1873,"tag":2159,"props":19598,"children":19600},{"className":19599},[],[19601],{"type":1878,"value":10982},{"type":1878,"value":6336},{"type":1873,"tag":2159,"props":19604,"children":19606},{"className":19605},[],[19607],{"type":1878,"value":7309},{"type":1878,"value":2077},{"type":1873,"tag":1874,"props":19610,"children":19611},{},[19612,19614,19620],{"type":1878,"value":19613},"See ",{"type":1873,"tag":1921,"props":19615,"children":19617},{"href":19616},"/404#Interaction%20with%20VK_EXT_debug_utils",[19618],{"type":1878,"value":19619},"Interaction with VK_EXT_debug_utils",{"type":1878,"value":19621}," for further information.",{"type":1873,"tag":2079,"props":19623,"children":19625},{"id":19624},"_why_is_vk_khr_shader_untyped_pointers_not_a_dependency_but_still_required_by_implementations",[19626,19628,19633],{"type":1878,"value":19627},"Why is ",{"type":1873,"tag":1921,"props":19629,"children":19631},{"href":2072,"rel":19630},[1925],[19632],{"type":1878,"value":1381},{"type":1878,"value":19634}," not a dependency, but still required by implementations?",{"type":1873,"tag":1874,"props":19636,"children":19637},{},[19638],{"type":1878,"value":19639},"Untyped pointers are only necessary when accessing the heap directly from the shader; for applications using shader mappings, they are not needed, so the extension can be omitted in this case.",{"type":1873,"tag":1880,"props":19641,"children":19643},{"id":19642},"_further_work",[19644],{"type":1878,"value":19645},"Further Work",{"type":1873,"tag":2079,"props":19647,"children":19649},{"id":19648},"_embedded_samplers",[19650],{"type":1878,"value":19651},"Embedded Samplers",{"type":1873,"tag":1874,"props":19653,"children":19654},{},[19655,19657,19661,19662,19666],{"type":1878,"value":19656},"Embedded samplers are both a feature of HLSL and necessary for YC",{"type":1873,"tag":3263,"props":19658,"children":19659},{},[19660],{"type":1878,"value":3267},{"type":1878,"value":3269},{"type":1873,"tag":3263,"props":19663,"children":19664},{},[19665],{"type":1878,"value":3274},{"type":1878,"value":19667}," support.\nNot having a bindless interface for these is unfortunate, and it would be good to replace this in the future.\nA possible avenue for exploration would be to add shader-defined samplers, rather than having them defined in the API.",{"type":1873,"tag":2079,"props":19669,"children":19671},{"id":19670},"_input_attachments",[19672],{"type":1878,"value":19673},"Input Attachments",{"type":1873,"tag":1874,"props":19675,"children":19676},{},[19677],{"type":1878,"value":19678},"Input attachments need some additional work in order to allow the use of both bindless descriptors and attachment indices that is not covered in this extension.\nFiguring out how to make this work cleanly would be a useful addition in a future extension.",{"type":1873,"tag":2079,"props":19680,"children":19682},{"id":19681},"_hlsl_bindless_push_data_root_constants",[19683],{"type":1878,"value":19684},"HLSL Bindless Push Data / Root Constants",{"type":1873,"tag":1874,"props":19686,"children":19687},{},[19688,19690,19696],{"type":1878,"value":19689},"Push data in HLSL can currently only be accessed by mapping to a constant buffer with bindings.\nIt would be useful to be able to do this bindlessly in a similar manner to GLSL, without bindings, and ideally in a way that maps correctly for DX12 as well.\nA proposal that includes this is currently in review for HLSL here: ",{"type":1873,"tag":1921,"props":19691,"children":19694},{"href":19692,"rel":19693},"https://github.com/microsoft/hlsl-specs/pull/461",[1925],[19695],{"type":1878,"value":19692},{"type":1878,"value":2077},{"type":1873,"tag":2079,"props":19698,"children":19700},{"id":19699},"_hlsl_heap_data_access",[19701],{"type":1878,"value":19702},"HLSL Heap Data Access",{"type":1873,"tag":1874,"props":19704,"children":19705},{},[19706],{"type":1878,"value":19707},"It would be useful to be able to express different data types coming from a resource heap, including POD types. This would allow more flexibility in access of these heaps, and allow the size of descriptors to vary, reducing unnecessary padding when accessing smaller descriptor types.",{"type":1873,"tag":2079,"props":19709,"children":19711},{"id":19710},"_better_debugging",[19712],{"type":1878,"value":19713},"Better Debugging",{"type":1873,"tag":1874,"props":19715,"children":19716},{},[19717,19719,19725],{"type":1878,"value":19718},"Debugging descriptors has been a pain since dynamic indexing was introduced, requiring point-of-access validation.\nThe current approach to this in debug tools requires looking up descriptors in a table to see if they are valid, which requires shader instrumentation, and is too slow to be on by default.\nTraverse Research did some excellent work on this topic in their bindless setup, where they restricted their descriptor indices to 31 bits and used the last bit as a sentinel value to check for validity, which you can read about ",{"type":1873,"tag":1921,"props":19720,"children":19722},{"href":3733,"rel":19721},[1925],[19723],{"type":1878,"value":19724},"here",{"type":1878,"value":19726},".\nFinding spare bits in real descriptors was considered, but could not be guaranteed reliably by all vendors.\nHowever, by exposing descriptor sizes precisely and allowing arbitrary data to be read from the heaps, a similar approach should be possible, potentially expanding beyond single descriptors.\nThis extension provides a lot of tools, the next step is to find ways to use them.",{"type":1873,"tag":19728,"props":19729,"children":19730},"style",{},[19731],{"type":1878,"value":19732},"html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: 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