| // Copyright 2017-2021 The Khronos Group, Inc. |
| // |
| // SPDX-License-Identifier: CC-BY-4.0 |
| |
| include::{generated}/meta/{refprefix}VK_KHR_acceleration_structure.txt[] |
| |
| === Other Extension Metadata |
| |
| *Last Modified Date*:: |
| 2021-09-30 |
| *Contributors*:: |
| - Samuel Bourasseau, Adobe |
| - Matthäus Chajdas, AMD |
| - Greg Grebe, AMD |
| - Nicolai Hähnle, AMD |
| - Tobias Hector, AMD |
| - Dave Oldcorn, AMD |
| - Skyler Saleh, AMD |
| - Mathieu Robart, Arm |
| - Marius Bjorge, Arm |
| - Tom Olson, Arm |
| - Sebastian Tafuri, EA |
| - Henrik Rydgard, Embark |
| - Juan Cañada, Epic Games |
| - Patrick Kelly, Epic Games |
| - Yuriy O'Donnell, Epic Games |
| - Michael Doggett, Facebook/Oculus |
| - Ricardo Garcia, Igalia |
| - Andrew Garrard, Imagination |
| - Don Scorgie, Imagination |
| - Dae Kim, Imagination |
| - Joshua Barczak, Intel |
| - Slawek Grajewski, Intel |
| - Jeff Bolz, NVIDIA |
| - Pascal Gautron, NVIDIA |
| - Daniel Koch, NVIDIA |
| - Christoph Kubisch, NVIDIA |
| - Ashwin Lele, NVIDIA |
| - Robert Stepinski, NVIDIA |
| - Martin Stich, NVIDIA |
| - Nuno Subtil, NVIDIA |
| - Eric Werness, NVIDIA |
| - Jon Leech, Khronos |
| - Jeroen van Schijndel, OTOY |
| - Juul Joosten, OTOY |
| - Alex Bourd, Qualcomm |
| - Roman Larionov, Qualcomm |
| - David McAllister, Qualcomm |
| - Lewis Gordon, Samsung |
| - Ralph Potter, Samsung |
| - Jasper Bekkers, Traverse Research |
| - Jesse Barker, Unity |
| - Baldur Karlsson, Valve |
| |
| === Description |
| |
| In order to be efficient, rendering techniques such as ray tracing need a |
| quick way to identify which primitives may be intersected by a ray |
| traversing the geometries. |
| Acceleration structures are the most common way to represent the geometry |
| spatially sorted, in order to quickly identify such potential intersections. |
| |
| This extension adds new functionalities: |
| |
| * Acceleration structure objects and build commands |
| * Structures to describe geometry inputs to acceleration structure builds |
| * Acceleration structure copy commands |
| |
| |
| include::{generated}/interfaces/VK_KHR_acceleration_structure.txt[] |
| |
| |
| === Issues |
| |
| (1) How does this extension differ from VK_NV_ray_tracing? |
| -- |
| *DISCUSSION*: |
| |
| The following is a summary of the main functional differences between |
| VK_KHR_acceleration_structure and VK_NV_ray_tracing: |
| |
| * added acceleration structure serialization / deserialization |
| (ename:VK_COPY_ACCELERATION_STRUCTURE_MODE_SERIALIZE_KHR, |
| ename:VK_COPY_ACCELERATION_STRUCTURE_MODE_DESERIALIZE_KHR, |
| flink:vkCmdCopyAccelerationStructureToMemoryKHR, |
| flink:vkCmdCopyMemoryToAccelerationStructureKHR) |
| * document <<acceleration-structure-inactive-prims,inactive primitives and |
| instances>> |
| * added slink:VkPhysicalDeviceAccelerationStructureFeaturesKHR structure |
| * added indirect and batched acceleration structure builds |
| (flink:vkCmdBuildAccelerationStructuresIndirectKHR) |
| * added <<host-acceleration-structure,host acceleration structure>> |
| commands |
| * reworked geometry structures so they could be better shared between |
| device, host, and indirect builds |
| * explicitly made slink:VkAccelerationStructureKHR use device addresses |
| * added acceleration structure compatibility check function |
| (flink:vkGetDeviceAccelerationStructureCompatibilityKHR) |
| * add parameter for requesting memory requirements for host and/or device |
| build |
| * added format feature for acceleration structure build vertex formats |
| (ename:VK_FORMAT_FEATURE_ACCELERATION_STRUCTURE_VERTEX_BUFFER_BIT_KHR) |
| -- |
| |
| ifdef::VK_NV_ray_tracing[] |
| (2) Can you give a more detailed comparision of differences and similarities |
| between VK_NV_ray_tracing and VK_KHR_acceleration_structure? |
| -- |
| *DISCUSSION*: |
| |
| The following is a more detailed comparision of which commands, structures, |
| and enums are aliased, changed, or removed. |
| |
| * Aliased functionality -- enums, structures, and commands that are |
| considered equivalent: |
| ** elink:VkGeometryTypeNV {harr} elink:VkGeometryTypeKHR |
| ** elink:VkAccelerationStructureTypeNV {harr} |
| elink:VkAccelerationStructureTypeKHR |
| ** elink:VkCopyAccelerationStructureModeNV {harr} |
| elink:VkCopyAccelerationStructureModeKHR |
| ** tlink:VkGeometryFlagsNV {harr} tlink:VkGeometryFlagsKHR |
| ** elink:VkGeometryFlagBitsNV {harr} elink:VkGeometryFlagBitsKHR |
| ** tlink:VkGeometryInstanceFlagsNV {harr} tlink:VkGeometryInstanceFlagsKHR |
| ** elink:VkGeometryInstanceFlagBitsNV {harr} |
| elink:VkGeometryInstanceFlagBitsKHR |
| ** tlink:VkBuildAccelerationStructureFlagsNV {harr} |
| tlink:VkBuildAccelerationStructureFlagsKHR |
| ** elink:VkBuildAccelerationStructureFlagBitsNV {harr} |
| elink:VkBuildAccelerationStructureFlagBitsKHR |
| ** slink:VkTransformMatrixNV {harr} slink:VkTransformMatrixKHR (added to |
| VK_NV_ray_tracing for descriptive purposes) |
| ** slink:VkAabbPositionsNV {harr} slink:VkAabbPositionsKHR (added to |
| VK_NV_ray_tracing for descriptive purposes) |
| ** slink:VkAccelerationStructureInstanceNV {harr} |
| slink:VkAccelerationStructureInstanceKHR (added to VK_NV_ray_tracing |
| for descriptive purposes) |
| |
| * Changed enums, structures, and commands: |
| ** renamed ename:VK_GEOMETRY_INSTANCE_TRIANGLE_CULL_DISABLE_BIT_NV -> |
| ename:VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHR in |
| elink:VkGeometryInstanceFlagBitsKHR |
| ** slink:VkGeometryTrianglesNV -> |
| slink:VkAccelerationStructureGeometryTrianglesDataKHR (device or host |
| address instead of buffer+offset) |
| ** slink:VkGeometryAABBNV -> |
| slink:VkAccelerationStructureGeometryAabbsDataKHR (device or host |
| address instead of buffer+offset) |
| ** slink:VkGeometryDataNV -> slink:VkAccelerationStructureGeometryDataKHR |
| (union of triangle/aabbs/instances) |
| ** slink:VkGeometryNV -> slink:VkAccelerationStructureGeometryKHR (changed |
| type of geometry) |
| ** slink:VkAccelerationStructureCreateInfoNV -> |
| slink:VkAccelerationStructureCreateInfoKHR (reshuffle geometry |
| layout/information) |
| ** slink:VkPhysicalDeviceRayTracingPropertiesNV -> |
| slink:VkPhysicalDeviceAccelerationStructurePropertiesKHR (for |
| acceleration structure properties, renamed pname:maxTriangleCount to |
| pname:maxPrimitiveCount, added per stage and update after bind limits) |
| and slink:VkPhysicalDeviceRayTracingPipelinePropertiesKHR (for ray |
| tracing pipeline properties) |
| ** slink:VkAccelerationStructureMemoryRequirementsInfoNV (deleted - |
| replaced by allocating on top of slink:VkBuffer) |
| ** slink:VkWriteDescriptorSetAccelerationStructureNV -> |
| slink:VkWriteDescriptorSetAccelerationStructureKHR (different |
| acceleration structure type) |
| ** flink:vkCreateAccelerationStructureNV -> |
| flink:vkCreateAccelerationStructureKHR (device address, different |
| geometry layout/information) |
| ** flink:vkGetAccelerationStructureMemoryRequirementsNV (deleted - |
| replaced by allocating on top of slink:VkBuffer) |
| ** flink:vkCmdBuildAccelerationStructureNV -> |
| flink:vkCmdBuildAccelerationStructuresKHR (params moved to structs, |
| layout differences) |
| ** flink:vkCmdCopyAccelerationStructureNV -> |
| flink:vkCmdCopyAccelerationStructureKHR (params to struct, extendable) |
| ** flink:vkGetAccelerationStructureHandleNV -> |
| flink:vkGetAccelerationStructureDeviceAddressKHR (device address |
| instead of handle) |
| ** elink:VkAccelerationStructureMemoryRequirementsTypeNV -> size queries |
| for scratch space moved to |
| flink:vkGetAccelerationStructureBuildSizesKHR |
| ** flink:vkDestroyAccelerationStructureNV -> |
| flink:vkDestroyAccelerationStructureKHR (different acceleration |
| structure types) |
| ** flink:vkCmdWriteAccelerationStructuresPropertiesNV -> |
| flink:vkCmdWriteAccelerationStructuresPropertiesKHR (different |
| acceleration structure types) |
| * Added enums, structures and commands: |
| ** ename:VK_GEOMETRY_TYPE_INSTANCES_KHR to elink:VkGeometryTypeKHR enum |
| ** ename:VK_COPY_ACCELERATION_STRUCTURE_MODE_SERIALIZE_KHR, |
| ename:VK_COPY_ACCELERATION_STRUCTURE_MODE_DESERIALIZE_KHR to |
| elink:VkCopyAccelerationStructureModeKHR enum |
| ** slink:VkPhysicalDeviceAccelerationStructureFeaturesKHR structure |
| ** elink:VkAccelerationStructureBuildTypeKHR enum |
| ** elink:VkBuildAccelerationStructureModeKHR enum |
| ** slink:VkDeviceOrHostAddressKHR and slink:VkDeviceOrHostAddressConstKHR |
| unions |
| ** slink:VkAccelerationStructureBuildRangeInfoKHR struct |
| ** slink:VkAccelerationStructureGeometryInstancesDataKHR struct |
| ** slink:VkAccelerationStructureDeviceAddressInfoKHR struct |
| ** slink:VkAccelerationStructureVersionInfoKHR struct |
| ** slink:VkStridedDeviceAddressRegionKHR struct |
| ** slink:VkCopyAccelerationStructureToMemoryInfoKHR struct |
| ** slink:VkCopyMemoryToAccelerationStructureInfoKHR struct |
| ** slink:VkCopyAccelerationStructureInfoKHR struct |
| ** flink:vkBuildAccelerationStructuresKHR command (host build) |
| ** flink:vkCopyAccelerationStructureKHR command (host copy) |
| ** flink:vkCopyAccelerationStructureToMemoryKHR (host serialize) |
| ** flink:vkCopyMemoryToAccelerationStructureKHR (host deserialize) |
| ** flink:vkWriteAccelerationStructuresPropertiesKHR (host properties) |
| ** flink:vkCmdCopyAccelerationStructureToMemoryKHR (device serialize) |
| ** flink:vkCmdCopyMemoryToAccelerationStructureKHR (device deserialize) |
| ** flink:vkGetDeviceAccelerationStructureCompatibilityKHR (serialization) |
| |
| -- |
| endif::VK_NV_ray_tracing[] |
| |
| (3) What are the changes between the public provisional (VK_KHR_ray_tracing |
| v8) release and the internal provisional (VK_KHR_ray_tracing v9) release? |
| -- |
| * added pname:geometryFlags to |
| stext:VkAccelerationStructureCreateGeometryTypeInfoKHR (later reworked |
| to obsolete this) |
| * added pname:minAccelerationStructureScratchOffsetAlignment property to |
| VkPhysicalDeviceRayTracingPropertiesKHR |
| * fix naming and return enum from |
| flink:vkGetDeviceAccelerationStructureCompatibilityKHR |
| ** renamed stext:VkAccelerationStructureVersionKHR to |
| slink:VkAccelerationStructureVersionInfoKHR |
| ** renamed etext:VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_VERSION_KHR to |
| ename:VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_VERSION_INFO_KHR |
| ** removed etext:VK_ERROR_INCOMPATIBLE_VERSION_KHR |
| ** added elink:VkAccelerationStructureCompatibilityKHR enum |
| ** remove return value from |
| flink:vkGetDeviceAccelerationStructureCompatibilityKHR and added return |
| enum parameter |
| * Require Vulkan 1.1 |
| * added creation time capture and replay flags |
| ** added elink:VkAccelerationStructureCreateFlagBitsKHR and |
| tlink:VkAccelerationStructureCreateFlagsKHR |
| ** renamed the pname:flags member of |
| slink:VkAccelerationStructureCreateInfoKHR to pname:buildFlags (later |
| removed) and added the pname:createFlags member |
| * change flink:vkCmdBuildAccelerationStructuresIndirectKHR to use buffer |
| device address for indirect parameter |
| * make `apiext:VK_KHR_deferred_host_operations` an interaction instead of |
| a required extension (later went back on this) |
| * renamed stext:VkAccelerationStructureBuildOffsetInfoKHR to |
| slink:VkAccelerationStructureBuildRangeInfoKHR |
| ** renamed the pname:ppOffsetInfos parameter of |
| flink:vkCmdBuildAccelerationStructuresKHR to pname:ppBuildRangeInfos |
| * Re-unify geometry description between build and create |
| ** remove stext:VkAccelerationStructureCreateGeometryTypeInfoKHR and |
| etext:VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_GEOMETRY_TYPE_INFO_KHR |
| ** added stext:VkAccelerationStructureCreateSizeInfoKHR structure (later |
| removed) |
| ** change type of the pname:pGeometryInfos member of |
| slink:VkAccelerationStructureCreateInfoKHR from |
| stext:VkAccelerationStructureCreateGeometryTypeInfoKHR to |
| slink:VkAccelerationStructureGeometryKHR (later removed) |
| ** added pname:pCreateSizeInfos member to |
| slink:VkAccelerationStructureCreateInfoKHR (later removed) |
| * Fix ppGeometries ambiguity, add pGeometries |
| ** remove pname:geometryArrayOfPointers member of |
| VkAccelerationStructureBuildGeometryInfoKHR |
| ** disambiguate two meanings of pname:ppGeometries by explicitly adding |
| pname:pGeometries to the |
| slink:VkAccelerationStructureBuildGeometryInfoKHR structure and require |
| one of them be `NULL` |
| * added <<features-nullDescriptor,nullDescriptor>> support for |
| acceleration structures |
| * changed the pname:update member of |
| slink:VkAccelerationStructureBuildGeometryInfoKHR from a bool to the |
| pname:mode elink:VkBuildAccelerationStructureModeKHR enum which allows |
| future extensibility in update types |
| * Clarify deferred host ops for pipeline creation |
| ** slink:VkDeferredOperationKHR is now a top-level parameter for |
| flink:vkBuildAccelerationStructuresKHR, |
| flink:vkCreateRayTracingPipelinesKHR, |
| flink:vkCopyAccelerationStructureToMemoryKHR, |
| flink:vkCopyAccelerationStructureKHR, and |
| flink:vkCopyMemoryToAccelerationStructureKHR |
| ** removed stext:VkDeferredOperationInfoKHR structure |
| ** change deferred host creation/return parameter behavior such that the |
| implementation can modify such parameters until the deferred host |
| operation completes |
| ** `apiext:VK_KHR_deferred_host_operations` is required again |
| * Change acceleration structure build to always be sized |
| ** de-alias ename:VkAccelerationStructureMemoryRequirementsTypeNV and |
| etext:VkAccelerationStructureMemoryRequirementsTypeKHR, and remove |
| etext:VkAccelerationStructureMemoryRequirementsTypeKHR |
| ** add flink:vkGetAccelerationStructureBuildSizesKHR command and |
| slink:VkAccelerationStructureBuildSizesInfoKHR structure and |
| ename:VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_SIZES_INFO_KHR |
| enum to query sizes for acceleration structures and scratch storage |
| ** move size queries for scratch space to |
| flink:vkGetAccelerationStructureBuildSizesKHR |
| ** remove pname:compactedSize, pname:buildFlags, pname:maxGeometryCount, |
| pname:pGeometryInfos, pname:pCreateSizeInfos members of |
| slink:VkAccelerationStructureCreateInfoKHR and add the pname:size |
| member |
| ** add pname:maxVertex member to |
| slink:VkAccelerationStructureGeometryTrianglesDataKHR structure |
| ** remove stext:VkAccelerationStructureCreateSizeInfoKHR structure |
| -- |
| |
| (4) What are the changes between the internal provisional |
| (VK_KHR_ray_tracing v9) release and the final (VK_KHR_acceleration_structure |
| v11) release? |
| -- |
| * refactor VK_KHR_ray_tracing into 3 extensions, enabling implementation |
| flexibility and decoupling ray query support from ray pipelines: |
| ** `apiext:VK_KHR_acceleration_structure` (for acceleration structure |
| operations) |
| ** `apiext:VK_KHR_ray_tracing_pipeline` (for ray tracing pipeline and |
| shader stages) |
| ** `apiext:VK_KHR_ray_query` (for ray queries in existing shader stages) |
| * clarify buffer usage flags for ray tracing |
| ** ename:VK_BUFFER_USAGE_RAY_TRACING_BIT_NV is left alone in |
| `apiext:VK_NV_ray_tracing` (required on pname:scratch and |
| pname:instanceData) |
| ** ename:VK_BUFFER_USAGE_SHADER_BINDING_TABLE_BIT_KHR is added as an alias |
| of ename:VK_BUFFER_USAGE_RAY_TRACING_BIT_NV in |
| `apiext:VK_KHR_ray_tracing_pipeline` and is required on shader binding |
| table buffers |
| ** ename:VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR |
| is added in `apiext:VK_KHR_acceleration_structure` for all vertex, |
| index, transform, aabb, and instance buffer data referenced by device |
| build commands |
| ** ename:VK_BUFFER_USAGE_STORAGE_BUFFER_BIT is used for pname:scratchData |
| * add max primitive counts (pname:ppMaxPrimitiveCounts) to |
| flink:vkCmdBuildAccelerationStructuresIndirectKHR |
| * Allocate acceleration structures from stext:VkBuffers and add a mode to |
| constrain the device address |
| ** de-alias sname:VkBindAccelerationStructureMemoryInfoNV and |
| fname:vkBindAccelerationStructureMemoryNV, and remove |
| stext:VkBindAccelerationStructureMemoryInfoKHR, |
| stext:VkAccelerationStructureMemoryRequirementsInfoKHR, and |
| ftext:vkGetAccelerationStructureMemoryRequirementsKHR |
| ** acceleration structures now take a slink:VkBuffer and offset at |
| creation time for memory placement |
| ** add a new ename:VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_STORAGE_BIT_KHR |
| buffer usage for such buffers |
| ** add a new ename:VK_ACCELERATION_STRUCTURE_TYPE_GENERIC_KHR acceleration |
| structure type for layering |
| * move ename:VK_GEOMETRY_TYPE_INSTANCES_KHR to main enum instead of being |
| added via extension |
| * make build commands more consistent - all now build multiple |
| acceleration structures and are named plurally |
| (flink:vkCmdBuildAccelerationStructuresIndirectKHR, |
| flink:vkCmdBuildAccelerationStructuresKHR, |
| flink:vkBuildAccelerationStructuresKHR) |
| * add interactions with |
| ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT for |
| acceleration structures, including a new feature |
| (pname:descriptorBindingAccelerationStructureUpdateAfterBind) and 3 new |
| properties (pname:maxPerStageDescriptorAccelerationStructures, |
| pname:maxPerStageDescriptorUpdateAfterBindAccelerationStructures, |
| pname:maxDescriptorSetUpdateAfterBindAccelerationStructures) |
| * extension is no longer provisional |
| * define synchronization requirements for builds, traces, and copies |
| * define synchronization requirements for AS build inputs and indirect |
| build buffer |
| -- |
| |
| (5) What is ename:VK_ACCELERATION_STRUCTURE_TYPE_GENERIC_KHR for? |
| -- |
| *RESOLVED*: It is primarily intended for API layering. |
| In DXR, the acceleration structure is basically just a buffer in a special |
| layout, and you do not know at creation time whether it will be used as a |
| top or bottom level acceleration structure. |
| We thus added a generic acceleration structure type whose type is unknown at |
| creation time, but is specified at build time instead. |
| Applications which are written directly for Vulkan should not use it. |
| -- |
| |
| === Version History |
| * Revision 1, 2019-12-05 (Members of the Vulkan Ray Tracing TSG) |
| - Internal revisions (forked from VK_NV_ray_tracing) |
| * Revision 2, 2019-12-20 (Daniel Koch, Eric Werness) |
| - Add const version of DeviceOrHostAddress (!3515) |
| - Add VU to clarify that only handles in the current pipeline are valid |
| (!3518) |
| - Restore some missing VUs and add in-place update language (#1902, |
| !3522) |
| - rename VkAccelerationStructureInstanceKHR member from |
| accelerationStructure to accelerationStructureReference to better |
| match its type (!3523) |
| - Allow VK_ERROR_INVALID_OPAQUE_CAPTURE_ADDRESS for pipeline creation if |
| shader group handles cannot be reused (!3523) |
| - update documentation for the VK_ERROR_INVALID_OPAQUE_CAPTURE_ADDRESS |
| error code and add missing documentation for new return codes from |
| VK_KHR_deferred_host_operations (!3523) |
| - list new query types for VK_KHR_ray_tracing (!3523) |
| - Fix VU statements for VkAccelerationStructureGeometryKHR referring to |
| correct union members and update to use more current wording (!3523) |
| * Revision 3, 2020-01-10 (Daniel Koch, Jon Leech, Christoph Kubisch) |
| - Fix 'instance of' and 'that/which contains/defines' markup issues |
| (!3528) |
| - factor out VK_KHR_pipeline_library as stand-alone extension (!3540) |
| - Resolve Vulkan-hpp issues (!3543) |
| - add missing require for VkGeometryInstanceFlagsKHR |
| - de-alias VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_INFO_NV |
| since the KHR structure is no longer equivalent |
| - add len to pDataSize attribute for |
| vkWriteAccelerationStructuresPropertiesKHR |
| * Revision 4, 2020-01-23 (Daniel Koch, Eric Werness) |
| - Improve vkWriteAccelerationStructuresPropertiesKHR, add return value |
| and VUs (#1947) |
| - Clarify language to allow multiple raygen shaders (#1959) |
| - Various editorial feedback (!3556) |
| - Add language to help deal with looped self-intersecting fans (#1901) |
| - Change vkCmdTraceRays{Indirect}KHR args to pointers (!3559) |
| - Add scratch address validation language (#1941, !3551) |
| - Fix definition and add hierarchy information for shader call scope |
| (#1977, !3571) |
| * Revision 5, 2020-02-04 (Eric Werness, Jeff Bolz, Daniel Koch) |
| - remove vestigial accelerationStructureUUID (!3582) |
| - update definition of repack instructions and improve memory model |
| interactions (#1910, #1913, !3584) |
| - Fix wrong sType for VkPhysicalDeviceRayTracingFeaturesKHR (#1988) |
| - Use provisional SPIR-V capabilities (#1987) |
| - require rayTraversalPrimitiveCulling if rayQuery is supported (#1927) |
| - Miss shaders do not have object parameters (!3592) |
| - Fix missing required types in XML (!3592) |
| - clarify matching conditions for update (!3592) |
| - add goal that host and device builds be similar (!3592) |
| - clarify that pname:maxPrimitiveCount limit should apply to triangles |
| and AABBs (!3592) |
| - Require alignment for instance arrayOfPointers (!3592) |
| - Zero is a valid value for instance flags (!3592) |
| - Add some alignment VUs that got lost in refactoring (!3592) |
| - Recommend TMin epsilon rather than culling (!3592) |
| - Get angle from dot product not cross product (!3592) |
| - Clarify that AH can access the payload and attributes (!3592) |
| - Match DXR behavior for inactive primitive definition (!3592) |
| - Use a more generic term than degenerate for inactive to avoid |
| confusion (!3592) |
| * Revision 6, 2020-02-20 (Daniel Koch) |
| - fix some dangling NV references (#1996) |
| - rename VkCmdTraceRaysIndirectCommandKHR to |
| VkTraceRaysIndirectCommandKHR (!3607) |
| - update contributor list (!3611) |
| - use uint64_t instead of VkAccelerationStructureReferenceKHR in |
| VkAccelerationStructureInstanceKHR (#2004) |
| * Revision 7, 2020-02-28 (Tobias Hector) |
| - remove HitTKHR SPIR-V builtin (spirv/spirv-extensions#7) |
| * Revision 8, 2020-03-06 (Tobias Hector, Dae Kim, Daniel Koch, Jeff Bolz, |
| Eric Werness) |
| - explicitly state that Tmax is updated when new closest intersection is |
| accepted (#2020,!3536) |
| - Made references to min and max t values consistent (!3644) |
| - finish enumerating differences relative to VK_NV_ray_tracing in issues |
| (1) and (2) (#1974,!3642) |
| - fix formatting in some math equations (!3642) |
| - Restrict the Hit Kind operand of code:OpReportIntersectionKHR to |
| 7-bits (spirv/spirv-extensions#8,!3646) |
| - Say ray tracing 'should:' be watertight (#2008,!3631) |
| - Clarify memory requirements for ray tracing buffers (#2005,!3649) |
| - Add callable size limits (#1997,!3652) |
| * Revision 9, 2020-04-15 (Eric Werness, Daniel Koch, Tobias Hector, Joshua |
| Barczak) |
| - Add geometry flags to acceleration structure creation (!3672) |
| - add build scratch memory alignment |
| (minAccelerationStructureScratchOffsetAlignment) (#2065,!3725) |
| - fix naming and return enum from |
| vkGetDeviceAccelerationStructureCompatibilityKHR (#2051,!3726) |
| - require SPIR-V 1.4 (#2096,!3777) |
| - added creation time capture/replay flags (#2104,!3774) |
| - require Vulkan 1.1 (#2133,!3806) |
| - use device addresses instead of VkBuffers for ray tracing commands |
| (#2074,!3815) |
| - add interactions with Vulkan 1.2 and VK_KHR_vulkan_memory_model |
| (#2133,!3830) |
| - make VK_KHR_pipeline_library an interaction instead of required |
| (#2045,#2108,!3830) |
| - make VK_KHR_deferred_host_operations an interaction instead of |
| required (#2045,!3830) |
| - removed maxCallableSize and added explicit stack size management for |
| ray pipelines (#1997,!3817,!3772,!3844) |
| - improved documentation for VkAccelerationStructureVersionInfoKHR |
| (#2135,3835) |
| - rename VkAccelerationStructureBuildOffsetInfoKHR to |
| VkAccelerationStructureBuildRangeInfoKHR (#2058,!3754) |
| - Re-unify geometry description between build and create (!3754) |
| - Fix ppGeometries ambiguity, add pGeometries (#2032,!3811) |
| - add interactions with VK_EXT_robustness2 and allow nullDescriptor |
| support for acceleration structures (#1920,!3848) |
| - added future extensibility for AS updates (#2114,!3849) |
| - Fix VU for dispatchrays and add a limit on the size of the full grid |
| (#2160,!3851) |
| - Add shaderGroupHandleAlignment property (#2180,!3875) |
| - Clarify deferred host ops for pipeline creation (#2067,!3813) |
| - Change acceleration structure build to always be sized |
| (#2131,#2197,#2198,!3854,!3883,!3880) |
| * Revision 10, 2020-07-03 (Mathieu Robart, Daniel Koch, Eric Werness, |
| Tobias Hector) |
| - Decomposition of the specification, from VK_KHR_ray_tracing to |
| VK_KHR_acceleration_structure (#1918,!3912) |
| - clarify buffer usage flags for ray tracing (#2181,!3939) |
| - add max primitive counts to build indirect command (#2233,!3944) |
| - Allocate acceleration structures from VkBuffers and add a mode to |
| constrain the device address (#2131,!3936) |
| - Move VK_GEOMETRY_TYPE_INSTANCES_KHR to main enum (#2243,!3952) |
| - make build commands more consistent (#2247,!3958) |
| - add interactions with UPDATE_AFTER_BIND (#2128,!3986) |
| - correct and expand build command VUs (!4020) |
| - fix copy command VUs (!4018) |
| - added various alignment requirements (#2229,!3943) |
| - fix valid usage for arrays of geometryCount items (#2198,!4010) |
| - define what is allowed to change on RTAS updates and relevant VUs |
| (#2177,!3961) |
| * Revision 11, 2020-11-12 (Eric Werness, Josh Barczak, Daniel Koch, Tobias |
| Hector) |
| - de-alias NV and KHR acceleration structure types and associated |
| commands (#2271,!4035) |
| - specify alignment for host copy commands (#2273,!4037) |
| - document |
| ename:VK_FORMAT_FEATURE_ACCELERATION_STRUCTURE_VERTEX_BUFFER_BIT_KHR |
| - specify that acceleration structures are non-linear (#2289,!4068) |
| - add several missing VUs for strides, vertexFormat, and indexType |
| (#2315,!4069) |
| - restore VUs for VkAccelerationStructureBuildGeometryInfoKHR |
| (#2337,!4098) |
| - ban multi-instance memory for host operations (#2324,!4102) |
| - allow dstAccelerationStructure to be null for |
| vkGetAccelerationStructureBuildSizesKHR (#2330,!4111) |
| - more build VU cleanup (#2138,#4130) |
| - specify host endianness for AS serialization (#2261,!4136) |
| - add invertible transform matrix VU (#1710,!4140) |
| - require geometryCount to be 1 for TLAS builds (!4145) |
| - improved validity conditions for build addresses (#4142) |
| - add single statement SPIR-V VUs, build limit VUs (!4158) |
| - document limits for vertex and aabb strides (#2390,!4184) |
| - specify that |
| ename:VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_KHR applies |
| to AS copies (#2382,#4173) |
| - define sync for AS build inputs and indirect buffer (#2407,!4208) |
| * Revision 12, 2021-08-06 (Samuel Bourasseau) |
| - rename VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_KHR to |
| VK_GEOMETRY_INSTANCE_TRIANGLE_FLIP_FACING_BIT_KHR (keep previous as |
| alias). |
| - Clarify description and add note. |
| * Revision 13, 2021-09-30 (Jon Leech) |
| - Add interaction with `apiext:VK_KHR_format_feature_flags2` to `vk.xml` |
