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addresses instead of a buffer would have added complexity.",{"type":1936,"tag":1937,"props":8132,"children":8133},{},[8134,8136,8142,8144,8149],{"type":1941,"value":8135},"The\n",{"type":1936,"tag":1948,"props":8137,"children":8140},{"href":8138,"rel":8139},"https://docs.vulkan.org/refpages/latest/refpages/source/VkAccelerationStructureTrianglesOpacityMicromapKHR.html",[1952],[8141],{"type":1941,"value":5262},{"type":1941,"value":8143},"\nstructure is not equivalent to the one provided with ",{"type":1936,"tag":1997,"props":8145,"children":8147},{"className":8146},[],[8148],{"type":1941,"value":402},{"type":1941,"value":4139},{"type":1936,"tag":2181,"props":8151,"children":8152},{},[8153,8172],{"type":1936,"tag":2185,"props":8154,"children":8155},{},[8156,8157,8162,8164,8170],{"type":1941,"value":2236},{"type":1936,"tag":1997,"props":8158,"children":8160},{"className":8159},[],[8161],{"type":1941,"value":4639},{"type":1941,"value":8163}," parameter is now a ",{"type":1936,"tag":1997,"props":8165,"children":8167},{"className":8166},[],[8168],{"type":1941,"value":8169},"VkDeviceAddress",{"type":1941,"value":8171}," type as micromaps\nare not permitted in host acceleration structure builds.",{"type":1936,"tag":2185,"props":8173,"children":8174},{},[8175,8176,8181,8182,8187],{"type":1941,"value":2236},{"type":1936,"tag":1997,"props":8177,"children":8179},{"className":8178},[],[8180],{"type":1941,"value":184},{"type":1941,"value":8163},{"type":1936,"tag":1997,"props":8183,"children":8185},{"className":8184},[],[8186],{"type":1941,"value":2002},{"type":1941,"value":8188}," object",{"type":1936,"tag":5231,"props":8190,"children":8192},{"id":8191},"_lossy_micromaps",[8193],{"type":1941,"value":8194},"Lossy Micromaps",{"type":1936,"tag":1937,"props":8196,"children":8197},{},[8198],{"type":1941,"value":8199},"Micromaps can be built as lossy with a new flag:",{"type":1936,"tag":2032,"props":8201,"children":8203},{"className":2034,"code":8202,"language":2036,"meta":2037,"style":2037},"VK_BUILD_ACCELERATION_STRUCTURE_MICROMAP_LOSSY_BIT_KHR = 0x00000400\n",[8204],{"type":1936,"tag":1997,"props":8205,"children":8206},{"__ignoreMap":2037},[8207],{"type":1936,"tag":2043,"props":8208,"children":8209},{"class":2045,"line":10},[8210,8215,8219,8223],{"type":1936,"tag":2043,"props":8211,"children":8212},{"style":2049},[8213],{"type":1941,"value":8214},"VK_BUILD_ACCELERATION_STRUCTURE_MICROMAP_LOSSY_BIT_KHR ",{"type":1936,"tag":2043,"props":8216,"children":8217},{"style":2055},[8218],{"type":1941,"value":2551},{"type":1936,"tag":2043,"props":8220,"children":8221},{"style":2055},[8222],{"type":1941,"value":2556},{"type":1936,"tag":2043,"props":8224,"children":8225},{"style":2559},[8226],{"type":1941,"value":8227},"00000400\n",{"type":1936,"tag":1937,"props":8229,"children":8230},{},[8231],{"type":1941,"value":8232},"Lossy micromaps allow an implementation to build the micromap with lossy compression\nand/or support more subdivision levels.",{"type":1936,"tag":1937,"props":8234,"children":8235},{},[8236,8238,8243,8245,8250],{"type":1941,"value":8237},"During traversal, a micromap built as lossy may substitute any state for\n",{"type":1936,"tag":1997,"props":8239,"children":8241},{"className":8240},[],[8242],{"type":1941,"value":5021},{"type":1941,"value":8244}," or\n",{"type":1936,"tag":1997,"props":8246,"children":8248},{"className":8247},[],[8249],{"type":1941,"value":5028},{"type":1941,"value":8251},". The implementation,\non an identically created instance and device, must perform any lossy substitutions\ninvariantly with respect to acceleration structures and micromaps constructed\nwith an equivalent shape and data.",{"type":1936,"tag":1937,"props":8253,"children":8254},{},[8255],{"type":1941,"value":8256},"Equivalent shape and data is left without complete definition since there\nare many ways to eventually construct the same effective micromap. The most\nconservative option would be for app to construct the micromap using the\nexact same methods and inputs to guarantee invariance. The invariance\nguarantee is only provided to give a deterministic workload and should\nnot be relied upon for functional invariance.",{"type":1936,"tag":1937,"props":8258,"children":8259},{},[8260],{"type":1941,"value":8261},"Applications should make sure that the any-hit shader or ray query hit\nconfirmation is compatible with the built state, for example, it should\nignore intersections with elements built with fully transparent and\naccept intersections with elements built with fully opaque states.\nThis way, when a potential substitution happens from one of those states\nto a fully unknown state, traversal still behaves in the expected manner\neven though the shader is invoked.",{"type":1936,"tag":1937,"props":8263,"children":8264},{},[8265],{"type":1941,"value":8266},"Lossy compression potentially offers a tradeoff between speeding up traversal at the\ncost of possibly more shader invocations. It allows the implementation to\napproximate regions of the micromap to a single state, conservatively invoking\nshader code instead of finding the exact intersection element. Since the\nsubstitution is required to be invariantly applied, this tradeoff is deterministic.",{"type":1936,"tag":1937,"props":8268,"children":8269},{},[8270,8272,8277],{"type":1941,"value":8271},"Similar methods could also be employed by the implementation to expose more\nsubdivision levels than what it normally supports without requiring applications\nto downsample the micromap. The implementation could compress the micromap such\nthat the highest level it supports is an approximation of the levels above it,\nletting the application to finely resolve these unsupported levels in the\nshader. The limit ",{"type":1936,"tag":1997,"props":8273,"children":8275},{"className":8274},[],[8276],{"type":1941,"value":7753},{"type":1941,"value":8278}," reports\nthe new maximum subdivision levels.",{"type":1936,"tag":5231,"props":8280,"children":8282},{"id":8281},"_features_2",[8283],{"type":1941,"value":223},{"type":1936,"tag":1937,"props":8285,"children":8286},{},[8287,8289,8294,8296,8303,8305,8310],{"type":1941,"value":8288},"This extension provides a significantly different interface than ",{"type":1936,"tag":1997,"props":8290,"children":8292},{"className":8291},[],[8293],{"type":1941,"value":402},{"type":1941,"value":8295},",\ndescribed elsewhere, therefore the feature struct\n",{"type":1936,"tag":1948,"props":8297,"children":8300},{"href":8298,"rel":8299},"https://docs.vulkan.org/refpages/latest/refpages/source/VkPhysicalDeviceOpacityMicromapFeaturesKHR.html",[1952],[8301],{"type":1941,"value":8302},"VkPhysicalDeviceOpacityMicromapFeaturesKHR",{"type":1941,"value":8304},"\nis not equivalent to the feature struct from ",{"type":1936,"tag":1997,"props":8306,"children":8308},{"className":8307},[],[8309],{"type":1941,"value":402},{"type":1941,"value":4139},{"type":1936,"tag":1937,"props":8312,"children":8313},{},[8314],{"type":1941,"value":8315},"Enabling features for one of these will not enable the counterpart feature in the other extension.",{"type":1936,"tag":1937,"props":8317,"children":8318},{},[8319,8320,8326,8328,8334,8336,8342],{"type":1941,"value":2236},{"type":1936,"tag":1997,"props":8321,"children":8323},{"className":8322},[],[8324],{"type":1941,"value":8325},"VkPhysicalDeviceOpacityMicromapFeaturesEXT::micromapHostCommands",{"type":1941,"value":8327}," feature is not promoted\ndue to host commands being removed, and\n",{"type":1936,"tag":1997,"props":8329,"children":8331},{"className":8330},[],[8332],{"type":1941,"value":8333},"VkPhysicalDeviceOpacityMicromapFeaturesEXT::micromapCaptureReplay",{"type":1941,"value":8335}," is superseded with\n",{"type":1936,"tag":1997,"props":8337,"children":8339},{"className":8338},[],[8340],{"type":1941,"value":8341},"VkPhysicalDeviceAccelerationStructureFeaturesKHR ::accelerationStructureCaptureReplay",{"type":1941,"value":4139},{"type":1936,"tag":5231,"props":8344,"children":8346},{"id":8345},"_properties_2",[8347],{"type":1941,"value":7609},{"type":1936,"tag":1937,"props":8349,"children":8350},{},[8351,8353,8360,8362,8367],{"type":1941,"value":8352},"The property struct\n",{"type":1936,"tag":1948,"props":8354,"children":8357},{"href":8355,"rel":8356},"https://docs.vulkan.org/refpages/latest/refpages/source/VkPhysicalDeviceOpacityMicromapPropertiesKHR.html",[1952],[8358],{"type":1941,"value":8359},"VkPhysicalDeviceOpacityMicromapPropertiesKHR",{"type":1941,"value":8361},"\nis not equivalent to the property struct from ",{"type":1936,"tag":1997,"props":8363,"children":8365},{"className":8364},[],[8366],{"type":1941,"value":402},{"type":1941,"value":8368}," due to inclusion of\na couple new properties:",{"type":1936,"tag":2181,"props":8370,"children":8371},{},[8372,8380],{"type":1936,"tag":2185,"props":8373,"children":8374},{},[8375],{"type":1936,"tag":1997,"props":8376,"children":8378},{"className":8377},[],[8379],{"type":1941,"value":7753},{"type":1936,"tag":2185,"props":8381,"children":8382},{},[8383],{"type":1936,"tag":1997,"props":8384,"children":8386},{"className":8385},[],[8387],{"type":1941,"value":7764},{"type":1936,"tag":5231,"props":8389,"children":8391},{"id":8390},"_discardable",[8392],{"type":1941,"value":8393},"Discardable",{"type":1936,"tag":1937,"props":8395,"children":8396},{},[8397],{"type":1941,"value":8398},"The discardable property for micromaps is not promoted, and the BLAS will always hold a reference to the micromap.\nThis feature was not widely supported and has minimal benefit to memory footprint. Not promoting this reduces the\nnumber of paths that applications should support.",{"type":1936,"tag":1937,"props":8400,"children":8401},{},[8402,8404,8410],{"type":1941,"value":8403},"This also includes removal of\n",{"type":1936,"tag":1997,"props":8405,"children":8407},{"className":8406},[],[8408],{"type":1941,"value":8409},"VK_BUILD_ACCELERATION_STRUCTURE_ALLOW_OPACITY_MICROMAP_DATA_UPDATE_BIT_EXT",{"type":1941,"value":8411},", as this was mostly intended for use\nwith discardable micromaps where the implementation integrates it within the acceleration structure’s internal\nrepresentation.",{"type":1936,"tag":5231,"props":8413,"children":8415},{"id":8414},"_serializing_acceleration_structures",[8416],{"type":1941,"value":8417},"Serializing Acceleration Structures",{"type":1936,"tag":1937,"props":8419,"children":8420},{},[8421,8423,8429],{"type":1941,"value":8422},"Acceleration structures being serialized have references to micromaps built with them. These device addresses\nare placed in a newly defined ",{"type":1936,"tag":1997,"props":8424,"children":8426},{"className":8425},[],[8427],{"type":1941,"value":8428},"VK_ACCELERATION_STRUCTURE_SERIALIZED_BLOCK_TYPE_OPACITY_MICROMAP_KHR",{"type":1941,"value":8430}," type block in the serialized data.",{"type":1936,"tag":2032,"props":8432,"children":8434},{"className":2034,"code":8433,"language":2036,"meta":2037,"style":2037},"typedef enum VkAccelerationStructureSerializedBlockTypeKHR {\n    VK_ACCELERATION_STRUCTURE_SERIALIZED_BLOCK_TYPE_OPACITY_MICROMAP_KHR = 0,\n    VK_ACCELERATION_STRUCTURE_SERIALIZED_BLOCK_TYPE_MAX_ENUM_KHR = 0x7FFFFFFF\n} VkAccelerationStructureSerializedBlockTypeKHR;\n",[8435],{"type":1936,"tag":1997,"props":8436,"children":8437},{"__ignoreMap":2037},[8438,8454,8474,8494],{"type":1936,"tag":2043,"props":8439,"children":8440},{"class":2045,"line":10},[8441,8445,8449],{"type":1936,"tag":2043,"props":8442,"children":8443},{"style":2055},[8444],{"type":1941,"value":2355},{"type":1936,"tag":2043,"props":8446,"children":8447},{"style":2055},[8448],{"type":1941,"value":2657},{"type":1936,"tag":2043,"props":8450,"children":8451},{"style":2049},[8452],{"type":1941,"value":8453}," VkAccelerationStructureSerializedBlockTypeKHR {\n",{"type":1936,"tag":2043,"props":8455,"children":8456},{"class":2045,"line":14},[8457,8462,8466,8470],{"type":1936,"tag":2043,"props":8458,"children":8459},{"style":2049},[8460],{"type":1941,"value":8461},"    VK_ACCELERATION_STRUCTURE_SERIALIZED_BLOCK_TYPE_OPACITY_MICROMAP_KHR ",{"type":1936,"tag":2043,"props":8463,"children":8464},{"style":2055},[8465],{"type":1941,"value":2551},{"type":1936,"tag":2043,"props":8467,"children":8468},{"style":2559},[8469],{"type":1941,"value":2811},{"type":1936,"tag":2043,"props":8471,"children":8472},{"style":2049},[8473],{"type":1941,"value":2092},{"type":1936,"tag":2043,"props":8475,"children":8476},{"class":2045,"line":18},[8477,8482,8486,8490],{"type":1936,"tag":2043,"props":8478,"children":8479},{"style":2049},[8480],{"type":1941,"value":8481},"    VK_ACCELERATION_STRUCTURE_SERIALIZED_BLOCK_TYPE_MAX_ENUM_KHR ",{"type":1936,"tag":2043,"props":8483,"children":8484},{"style":2055},[8485],{"type":1941,"value":2551},{"type":1936,"tag":2043,"props":8487,"children":8488},{"style":2055},[8489],{"type":1941,"value":2556},{"type":1936,"tag":2043,"props":8491,"children":8492},{"style":2559},[8493],{"type":1941,"value":4465},{"type":1936,"tag":2043,"props":8495,"children":8496},{"class":2045,"line":22},[8497],{"type":1936,"tag":2043,"props":8498,"children":8499},{"style":2049},[8500],{"type":1941,"value":8501},"} VkAccelerationStructureSerializedBlockTypeKHR;\n",{"type":1936,"tag":1937,"props":8503,"children":8504},{},[8505],{"type":1941,"value":8506},"First, a bottom-level acceleration structure defines how many blocks it contains in the serialized header:",{"type":1936,"tag":2181,"props":8508,"children":8509},{},[8510],{"type":1936,"tag":2185,"props":8511,"children":8512},{},[8513],{"type":1941,"value":8514},"A 64-bit integer consisting of two packed 32 bit values. The high 32 bits\nare 0xFFFFFFFF to indicate a block-based format, and the low 32 bits\ncontain the number of serialized blocks that follow",{"type":1936,"tag":1937,"props":8516,"children":8517},{},[8518],{"type":1941,"value":8519},"Then each block is enumerated in the header, which looks like the following:",{"type":1936,"tag":2181,"props":8521,"children":8522},{},[8523,8533,8538,8543],{"type":1936,"tag":2185,"props":8524,"children":8525},{},[8526,8528],{"type":1941,"value":8527},"A 32-bit unsigned integer set to\n",{"type":1936,"tag":1997,"props":8529,"children":8531},{"className":8530},[],[8532],{"type":1941,"value":8428},{"type":1936,"tag":2185,"props":8534,"children":8535},{},[8536],{"type":1941,"value":8537},"A 32-bit reserved value for alignment",{"type":1936,"tag":2185,"props":8539,"children":8540},{},[8541],{"type":1941,"value":8542},"A 64-bit unsigned integer indicating the number of block buffer device\naddresses that follow the block header",{"type":1936,"tag":2185,"props":8544,"children":8545},{},[8546],{"type":1941,"value":8547},"An array of 64-bit buffer device addresses pointing to micromaps,\nwith the count matching the previous value",{"type":1936,"tag":1937,"props":8549,"children":8550},{},[8551],{"type":1941,"value":8552},"The application is responsible for keeping a mapping between these addresses and their respective micromaps.\nBefore deserializing the BLAS, applications must replace them in the serialized block with the addresses of newly\ncreated micromaps, or create the micromaps with the same device addresses through capture/replay mechanisms.",{"type":1936,"tag":1937,"props":8554,"children":8555},{},[8556,8558,8563],{"type":1941,"value":8557},"Before the BLAS is used, its micromaps must be deserialized from the serialized data of the micromaps\noriginally referenced by the serialized BLAS, or replaced by newly constructed micromaps with a BLAS\nupdate if it was originally built with the\n",{"type":1936,"tag":1997,"props":8559,"children":8561},{"className":8560},[],[8562],{"type":1941,"value":5114},{"type":1941,"value":8564}," flag.",{"type":1936,"tag":1937,"props":8566,"children":8567},{},[8568],{"type":1941,"value":8569},"Applications cannot update a deserialized BLAS with a micromap data only update, it can only perform\na full micromap reference replacement build update. Implementations cannot reasonably guarantee that\nthe internal data structures are compatible for data only update between the serialize and\ndeserialize Vulkan instances.",{"type":1936,"tag":1958,"props":8571,"children":8573},{"id":8572},"_examples",[8574],{"type":1941,"value":8575},"Examples",{"type":1936,"tag":2032,"props":8577,"children":8579},{"className":2034,"code":8578,"language":2036,"meta":2037,"style":2037},"    VkAccelerationStructureGeometryMicromapDataKHR micromapData = {\n          .sType               = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_MICROMAP_DATA_KHR,\n          .usageCountsCount    = usageCount,\n          .pUsageCounts        = &usage,\n          .triangleArrayStride = 8\n    };\n\n    VkAccelerationStructureGeometryKHR geometry = {\n      .sType        = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_KHR,\n      .pNext        = &micromapData,\n      .geometryType = VK_GEOMETRY_TYPE_MICROMAP_KHR\n    };\n\n    VkAccelerationStructureBuildGeometryInfoKHR buildInfo = {\n      .sType         = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_GEOMETRY_INFO_KHR,\n      .type          = VK_ACCELERATION_STRUCTURE_TYPE_OPACITY_MICROMAP_KHR,\n      .mode          = VK_BUILD_ACCELERATION_STRUCTURE_MODE_BUILD_KHR,\n      .geometryCount = 1,\n      .pGeometries   = &geometry\n    };\n\n    VkAccelerationStructureBuildSizesInfoKHR sizeInfo = {\n        .sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_SIZES_INFO_KHR,\n    };\n\n    vkGetAccelerationStructureBuildSizesKHR(device,\n                                            VK_ACCELERATION_STRUCTURE_BUILD_TYPE_DEVICE_KHR\n                                            &buildInfo,\n                                            NULL,\n                                            &sizeInfo);\n\n    // Create with VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_STORAGE_BIT_KHR | VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT\n    micromapBufferAddress = CreateBuffer(sizeInfo.accelerationStructureSize);\n\n    // Create with VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT\n    scratchBufferAddress  = CreateBuffer(sizeInfo.buildScratchSize);\n\n    VkAccelerationStructureCreateInfo2KHR  createInfo = {\n        .sType        = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_INFO_KHR,\n        .addressRange = bufferAddress,\n        .type         = VK_ACCELERATION_STRUCTURE_TYPE_OPACITY_MICROMAP_KHR\n    };\n\n    vkCreateAccelerationStructure2KHR(device, &createInfo, NULL, &micromap);\n\n    buildInfo.dstAccelerationStructure = micromap;\n    buildInfo.scratchData              = scratchBufferAddress;\n\n    // Created with VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR | VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT\n    buildInfo.pGeometries[0].geometry.data          = dataAddress;\n    buildInfo.pGeometries[0].geometry.triangleArray = triangleArrayAddress;\n\n    VkAccelerationStructureBuildRangeInfoKHR buildRangeInfo[1] = {};\n\n    vkCmdBuildAccelerationStructuresKHR(cmdBuf, 1, &buildInfo, &buildRangeInfo);\n\n    VkAccelerationStructureTrianglesOpacityMicromapKHR opacityGeometryMicromap = {\n        .sType        = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_TRIANGLES_OPACITY_MICROMAP_KHR,\n        .indexType    = indexType,\n        .indexBuffer  = indexBufferAddress,\n        .indexStride  = indexStride,\n        .baseTriangle = baseTriangle,\n        .micromap     = micromap\n    };\n\n    VkAccelerationStructureGeometryKHR bottomASGeometry = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_KHR };\n\n    bottomASGeometry... = ;\n    bottomASGeometry.pNext = &opacityGeometryMicromap;\n\n    vkGetAccelerationStructureBuildSizesKHR()\n    vkCreateAccelerationStructureKHR()\n    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