Change log for October 4, 2024 Vulkan 1.3.297 spec update:

Public Issues

  * Fix references to images in proposal documents (public issue 2441).

Internal Issues

  * Add new <<acceleration-structure-degenerate-prims, Degenerate Primitives
    and Instances>> section for acceleration structures (internal issue
    3932).
  * Rewrite language to clarify behavior with out-of-AABB intersections in
    the <<ray-intersection-confirmation, Ray Intersection Confirmation>>
    section (internal issue 3973).

New Extensions

  * VK_EXT_present_mode_fifo_latest_ready

ChangeLog.adoc

@@ -14,6 +14,27 @@ appears frequently in the change log.
 
 '''
 
+Change log for October 4, 2024 Vulkan 1.3.297 spec update:
+
+Public Issues
+
+  * Fix references to images in proposal documents (public issue 2441).
+
+Internal Issues
+
+  * Add new <<acceleration-structure-degenerate-prims, Degenerate Primitives
+    and Instances>> section for acceleration structures (internal issue
+    3932).
+  * Rewrite language to clarify behavior with out-of-AABB intersections in
+    the <<ray-intersection-confirmation, Ray Intersection Confirmation>>
+    section (internal issue 3973).
+
+New Extensions
+
+  * VK_EXT_present_mode_fifo_latest_ready
+
+'''
+
 Change log for September 26, 2024 Vulkan 1.3.296 spec update:
 
 Public Issues

Makefile

@@ -139,7 +139,7 @@ VERBOSE =
 # ADOCOPTS options for asciidoc->HTML5 output
 
 NOTEOPTS     = -a editing-notes -a implementation-guide
-PATCHVERSION = 296
+PATCHVERSION = 297
 BASEOPTS     =
 
 ifneq (,$(findstring VKSC_VERSION_1_0,$(VERSIONS)))

appendices/VK_EXT_present_mode_fifo_latest_ready.adoc

@@ -0,0 +1,42 @@
+// Copyright 2024 The Khronos Group Inc.
+//
+// SPDX-License-Identifier: CC-BY-4.0
+
+include::{generated}/meta/{refprefix}VK_EXT_present_mode_fifo_latest_ready.adoc[]
+
+=== Other Extension Metadata
+
+*Last Modified Date*::
+    2024-05-28
+*IP Status*::
+    No known IP claims.
+*Contributors*::
+  - James Jones, NVIDIA
+  - Lionel Duc, NVIDIA
+
+=== Description
+
+This device extension adds a new present mode,
+ename:VK_PRESENT_MODE_FIFO_LATEST_READY_EXT.
+
+This tear-free present mode behaves much like
+ename:VK_PRESENT_MODE_FIFO_KHR, except that each vertical blanking period
+dequeues consecutive present requests until the latest ready is found to
+update the current image.
+
+While this seems similar in concept to ename:VK_PRESENT_MODE_MAILBOX_KHR,
+the fundamental difference is that the processing of the present requests is
+done during vblank.
+From the application perspective, this means for example, that in a
+flip-based model, a single vblank may: cause multiple swapchain images to be
+released at once, while ename:VK_PRESENT_MODE_MAILBOX_KHR may: continuously
+be releasing images as new requests become ready.
+
+This additional present mode is useful when using a time-based present API.
+
+include::{generated}/interfaces/VK_EXT_present_mode_fifo_latest_ready.adoc[]
+
+=== Version History
+
+  * Revision 1, 2024-05-28 (Lionel Duc)
+  ** Internal revisions

appendices/credits.adoc

@@ -387,7 +387,7 @@ endif::VKSC_VERSION_1_0[]
   * Stuart Smith, AMD (versions 1.0, 1.1, 1.2, 1.3)
   * Sujeevan Rajayogam, Google (version 1.3)
   * Tilmann Scheller, Samsung Electronics (version 1.1)
-  * Tim Foley, Intel (version 1.0)
+  * Theresa Foley, Intel (version 1.0)
   * Tim Lewis, Khronos (version 1.3)
   * Timo Suoranta, AMD (version 1.0)
   * Timothy Lottes, AMD (versions 1.0, 1.1)

appendices/spirvenv.adoc

@@ -305,7 +305,7 @@ or knowledge of runtime information, such as enabled features.
     of 2 (storage image)
   * [[VUID-{refpage}-SubpassData-04660]]
     The [eq]#(u,v)# coordinates used for a code:SubpassData must: be the
-    <id> of a constant vector [eq]#(0,0)#.
+    <id> of a constant vector [eq]#(0,0)#
   * [[VUID-{refpage}-OpTypeImage-06924]]
     Objects of types code:OpTypeImage, code:OpTypeSampler,
     code:OpTypeSampledImage, code:OpTypeAccelerationStructureKHR, and arrays
@@ -333,10 +333,10 @@ or knowledge of runtime information, such as enabled features.
     <<interfaces-builtin-variables>> must: not be used
   * [[VUID-{refpage}-OpEntryPoint-09658]]
     For a given code:OpEntryPoint, any code:BuiltIn decoration must: not be
-    used more than once by the code:Input interface.
+    used more than once by the code:Input interface
   * [[VUID-{refpage}-OpEntryPoint-09659]]
     For a given code:OpEntryPoint, any code:BuiltIn decoration must: not be
-    used more than once by the code:Output interface.
+    used more than once by the code:Output interface
   * [[VUID-{refpage}-Location-06672]]
     The code:Location or code:Component decorations must: only be used with
     the code:Input, code:Output, code:RayPayloadKHR,
@@ -1321,7 +1321,7 @@ ifdef::VK_NV_cooperative_matrix[]
      must be 1.
   ** If code:ComponentType of code:A, code:B, code:C, or code:Result is an
      unsigned integral type, the code:Signedness operand of the
-     code:OpTypeInt must be 0.
+     code:OpTypeInt must be 0
   * [[VUID-{refpage}-OpTypeCooperativeMatrixNV-06322]]
     code:OpTypeCooperativeMatrixNV and code:OpCooperativeMatrix*
     instructions must: not be used in shader stages not included in
@@ -1331,7 +1331,7 @@ ifdef::VK_KHR_cooperative_matrix[]
   * [[VUID-{refpage}-OpTypeCooperativeMatrixKHR-08974]]
     For code:OpTypeCooperativeMatrixKHR, the component type, scope, number
     of rows, and number of columns must: match one of the matrices in any of
-    the supported slink:VkCooperativeMatrixPropertiesKHR.
+    the supported slink:VkCooperativeMatrixPropertiesKHR
   * [[VUID-{refpage}-OpCooperativeMatrixMulAddKHR-10060]]
     For code:OpCooperativeMatrixMulAddKHR, the operands must: match a
     supported slink:VkCooperativeMatrixPropertiesKHR, such that:
@@ -1371,7 +1371,7 @@ ifdef::VK_KHR_cooperative_matrix[]
      slink:VkCooperativeMatrixPropertiesKHR::pname:saturatingAccumulation is
      ename:VK_FALSE, code:SaturatingAccumulationKHR must: not be used.
   ** The scope of all cooperative matrix operands must: be
-     elink:VkScopeKHR::ename:VK_SCOPE_SUBGROUP_KHR.
+     elink:VkScopeKHR::ename:VK_SCOPE_SUBGROUP_KHR
   * [[VUID-{refpage}-cooperativeMatrixSupportedStages-08985]]
     code:OpTypeCooperativeMatrixKHR and code:OpCooperativeMatrix*
     instructions must: not be used in shader stages not included in

chapters/VK_EXT_depth_clamp_control/fragops.adoc

@@ -31,7 +31,7 @@ ename:VK_DEPTH_CLAMP_MODE_VIEWPORT_RANGE_EXT.
     ename:VK_DEPTH_CLAMP_MODE_USER_DEFINED_RANGE_EXT, and the pipeline is
     not created with ename:VK_DYNAMIC_STATE_DEPTH_CLAMP_RANGE_EXT, then
     pname:pDepthClampRange must be a valid pointer to a valid
-    sname:VkDepthClampRangeEXT structure.
+    sname:VkDepthClampRangeEXT structure
 ****
 
 include::{generated}/validity/structs/VkPipelineViewportDepthClampControlCreateInfoEXT.adoc[]
@@ -88,7 +88,7 @@ value used to create the currently active pipeline.
     If pname:depthClampMode is set to
     ename:VK_DEPTH_CLAMP_MODE_USER_DEFINED_RANGE_EXT, then
     pname:pDepthClampRange must be a valid pointer to a valid
-    sname:VkDepthClampRangeEXT structure.
+    sname:VkDepthClampRangeEXT structure
 ****
 
 include::{generated}/validity/protos/vkCmdSetDepthClampRangeEXT.adoc[]

chapters/VK_EXT_swapchain_maintenance1/SwapchainPresentModeInfo.adoc

@@ -47,29 +47,45 @@ endif::VK_KHR_shared_presentable_image[]
     vertical blanking period will follow the new mode for current and
     subsequent images.
   * Transition from ename:VK_PRESENT_MODE_IMMEDIATE_KHR to
-    ename:VK_PRESENT_MODE_FIFO_KHR or
-    ename:VK_PRESENT_MODE_FIFO_RELAXED_KHR: As all prior present requests in
-    the ename:VK_PRESENT_MODE_IMMEDIATE_KHR mode are applied immediately,
-    there are no outstanding present operations in this mode, and current
-    and subsequent images are appended to the FIFO queue and presented
-    according to the new mode.
+    ename:VK_PRESENT_MODE_FIFO_KHR or ename:VK_PRESENT_MODE_FIFO_RELAXED_KHR
+ifdef::VK_EXT_present_mode_fifo_latest_ready[]
+    or ename:VK_PRESENT_MODE_FIFO_LATEST_READY_EXT
+endif::VK_EXT_present_mode_fifo_latest_ready[]
+    : As all prior present requests in the
+    ename:VK_PRESENT_MODE_IMMEDIATE_KHR mode are applied immediately, there
+    are no outstanding present operations in this mode, and current and
+    subsequent images are appended to the FIFO queue and presented according
+    to the new mode.
   * Transition from ename:VK_PRESENT_MODE_MAILBOX_KHR to
-    ename:VK_PRESENT_MODE_FIFO_KHR or
-    ename:VK_PRESENT_MODE_FIFO_RELAXED_KHR: Presentation in both modes
-    require waiting for the next vertical blanking period, with
-    ename:VK_PRESENT_MODE_MAILBOX_KHR allowing the pending present operation
-    to be replaced by a new one.
+    ename:VK_PRESENT_MODE_FIFO_KHR or ename:VK_PRESENT_MODE_FIFO_RELAXED_KHR
+ifdef::VK_EXT_present_mode_fifo_latest_ready[]
+    or ename:VK_PRESENT_MODE_FIFO_LATEST_READY_EXT
+endif::VK_EXT_present_mode_fifo_latest_ready[]
+    : Presentation in FIFO modes require waiting for the next vertical
+    blanking period, with ename:VK_PRESENT_MODE_MAILBOX_KHR allowing the
+    pending present operation to be replaced by a new one.
     In this case, the current present operation will replace the pending
     present operation and is applied according to the new mode.
   * Transition from ename:VK_PRESENT_MODE_FIFO_KHR or
-    ename:VK_PRESENT_MODE_FIFO_RELAXED_KHR to
-    ename:VK_PRESENT_MODE_IMMEDIATE_KHR or
+    ename:VK_PRESENT_MODE_FIFO_RELAXED_KHR
+ifdef::VK_EXT_present_mode_fifo_latest_ready[]
+    or ename:VK_PRESENT_MODE_FIFO_LATEST_READY_EXT
+endif::VK_EXT_present_mode_fifo_latest_ready[]
+    to ename:VK_PRESENT_MODE_IMMEDIATE_KHR or
     ename:VK_PRESENT_MODE_MAILBOX_KHR: If the FIFO queue is empty,
     presentation is done according to the behavior of the new mode.
     If there are present operations in the FIFO queue, once the last present
     operation is performed based on the respective vertical blanking period,
     the current and subsequent updates are applied according to the new
     mode.
+ifdef::VK_EXT_present_mode_fifo_latest_ready[]
+  * Transition between ename:VK_PRESENT_MODE_FIFO_KHR or
+    ename:VK_PRESENT_MODE_FIFO_RELAXED_KHR, and
+    ename:VK_PRESENT_MODE_FIFO_LATEST_READY_EXT: Images continue to be
+    appended to the same FIFO queue, and the behavior with respect to
+    waiting for vertical blanking period and dequeuing requests will follow
+    the new mode for current and subsequent images.
+endif::VK_EXT_present_mode_fifo_latest_ready[]
   * The behavior during transition between any other present modes, if
     possible, is implementation defined.
 

chapters/VK_EXT_swapchain_maintenance1/SwapchainPresentModesCreateInfo.adoc

@@ -29,6 +29,12 @@ include::{generated}/api/structs/VkSwapchainPresentModesCreateInfoEXT.adoc[]
     Each entry in pPresentModes must: be one of the elink:VkPresentModeKHR
     values returned by fname:vkGetPhysicalDeviceSurfacePresentModesKHR for
     the surface
+ifdef::VK_EXT_present_mode_fifo_latest_ready[]
+  * [[VUID-VkSwapchainPresentModesCreateInfoEXT-presentModeFifoLatestReady-10160]]
+    If the <<features-presentModeFifoLatestReady,
+    pname:presentModeFifoLatestReady>> feature is not enabled, pPresentModes
+    must: not contain ename:VK_PRESENT_MODE_FIFO_LATEST_READY_EXT
+endif::VK_EXT_present_mode_fifo_latest_ready[]
   * [[VUID-VkSwapchainPresentModesCreateInfoEXT-pPresentModes-07763]]
     The entries in pPresentModes must: be a subset of the present modes
     returned in

chapters/VK_HUAWEI_cluster_culling_shader/drawing.adoc

@@ -95,7 +95,7 @@ include::{chapters}/commonvalidity/draw_indirect_drawcount.adoc[]
   * [[VUID-vkCmdDrawClusterIndirectHUAWEI-ClusterCullingHUAWEI-07824]]
     The current pipeline bound to ename:VK_PIPELINE_BIND_POINT_GRAPHICS
     must: contain a shader stage using the code:ClusterCullingHUAWEI
-    {ExecutionModel}.
+    {ExecutionModel}
   * [[VUID-vkCmdDrawClusterIndirectHUAWEI-offset-07918]]
     pname:offset must: be a multiple of
     slink:VkPhysicalDeviceClusterCullingShaderPropertiesHUAWEI::pname:indirectBufferOffsetAlignment

chapters/VK_KHR_surface/wsi.adoc

@@ -386,9 +386,12 @@ include::{generated}/api/structs/VkSurfaceCapabilitiesKHR.adoc[]
     representing the ways the application can: use the presentable images of
     a swapchain created
 ifdef::VK_KHR_shared_presentable_image[]
-    with elink:VkPresentModeKHR set to ename:VK_PRESENT_MODE_IMMEDIATE_KHR,
-    ename:VK_PRESENT_MODE_MAILBOX_KHR, ename:VK_PRESENT_MODE_FIFO_KHR or
-    ename:VK_PRESENT_MODE_FIFO_RELAXED_KHR
+    with elink:VkPresentModeKHR set to
+ifdef::VK_EXT_present_mode_fifo_latest_ready[]
+    ename:VK_PRESENT_MODE_FIFO_LATEST_READY_EXT,
+endif::VK_EXT_present_mode_fifo_latest_ready[]
+    ename:VK_PRESENT_MODE_IMMEDIATE_KHR, ename:VK_PRESENT_MODE_MAILBOX_KHR,
+    ename:VK_PRESENT_MODE_FIFO_KHR or ename:VK_PRESENT_MODE_FIFO_RELAXED_KHR
 endif::VK_KHR_shared_presentable_image[]
     for the surface on the specified device.
     ename:VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT must: be included in the set.
@@ -1576,6 +1579,26 @@ include::{generated}/api/enums/VkPresentModeKHR.adoc[]
     New requests are appended to the end of the queue, and one request is
     removed from the beginning of the queue and processed during or after
     each vertical blanking period in which the queue is non-empty.
+ifdef::VK_EXT_present_mode_fifo_latest_ready[]
+  * ename:VK_PRESENT_MODE_FIFO_LATEST_READY_EXT specifies that the
+    presentation engine waits for the next vertical blanking period to
+    update the current image.
+    Tearing cannot: be observed.
+    An internal queue is used to hold pending presentation requests.
+    New requests are appended to the end of the queue.
+    At each vertical blanking period, the presentation engine dequeues all
+    successive requests that are ready to be presented from the beginning of
+    the queue.
+ifdef::VK_GOOGLE_display_timing[]
+    If using `apiext:VK_GOOGLE_display_timing` to provide a target present
+    time, the presentation engine will check the specified time for each
+    image.
+    If the target present time is less-than or equal-to the current time,
+    the presentation engine will dequeue the image and check the next one.
+endif::VK_GOOGLE_display_timing[]
+    The image of the last dequeued request will be presented.
+    The other dequeued requests will be dropped.
+endif::VK_EXT_present_mode_fifo_latest_ready[]
 ifdef::VK_KHR_shared_presentable_image[]
   * ename:VK_PRESENT_MODE_SHARED_DEMAND_REFRESH_KHR specifies that the
     presentation engine and application have concurrent access to a single
@@ -1612,6 +1635,9 @@ mode, and can be determined as per the table below:
 | ename:VK_PRESENT_MODE_MAILBOX_KHR                   | slink:VkSurfaceCapabilitiesKHR::pname:supportedUsageFlags
 | ename:VK_PRESENT_MODE_FIFO_KHR                      | slink:VkSurfaceCapabilitiesKHR::pname:supportedUsageFlags
 | ename:VK_PRESENT_MODE_FIFO_RELAXED_KHR              | slink:VkSurfaceCapabilitiesKHR::pname:supportedUsageFlags
+ifdef::VK_EXT_present_mode_fifo_latest_ready[]
+| ename:VK_PRESENT_MODE_FIFO_LATEST_READY_EXT         | slink:VkSurfaceCapabilitiesKHR::pname:supportedUsageFlags
+endif::VK_EXT_present_mode_fifo_latest_ready[]
 | ename:VK_PRESENT_MODE_SHARED_DEMAND_REFRESH_KHR     | slink:VkSharedPresentSurfaceCapabilitiesKHR::pname:sharedPresentSupportedUsageFlags
 | ename:VK_PRESENT_MODE_SHARED_CONTINUOUS_REFRESH_KHR | slink:VkSharedPresentSurfaceCapabilitiesKHR::pname:sharedPresentSupportedUsageFlags
 |====

chapters/VK_KHR_swapchain/wsi.adoc

@@ -397,7 +397,6 @@ endif::VKSC_VERSION_1_0[]
     the pname:maxImageCount member of the sname:VkSurfaceCapabilitiesKHR
     structure returned by fname:vkGetPhysicalDeviceSurfaceCapabilitiesKHR
     for the surface if the returned pname:maxImageCount is not zero
-  * [[VUID-VkSwapchainCreateInfoKHR-presentMode-02839]]
 ifdef::VK_EXT_swapchain_maintenance1[]
   * [[VUID-VkSwapchainCreateInfoKHR-swapchainMaintenance1-10155]]
     If the <<features-swapchainMaintenance1,pname:swapchainMaintenance1>>
@@ -465,8 +464,12 @@ endif::VK_EXT_swapchain_maintenance1[]
     sname:VkSurfaceCapabilitiesKHR structure returned by
     fname:vkGetPhysicalDeviceSurfaceCapabilitiesKHR for the surface
   * [[VUID-VkSwapchainCreateInfoKHR-presentMode-01427]]
-    If pname:presentMode is ename:VK_PRESENT_MODE_IMMEDIATE_KHR,
-    ename:VK_PRESENT_MODE_MAILBOX_KHR, ename:VK_PRESENT_MODE_FIFO_KHR or
+    If pname:presentMode is
+ifdef::VK_EXT_present_mode_fifo_latest_ready[]
+    ename:VK_PRESENT_MODE_FIFO_LATEST_READY_EXT,
+endif::VK_EXT_present_mode_fifo_latest_ready[]
+    ename:VK_PRESENT_MODE_IMMEDIATE_KHR, ename:VK_PRESENT_MODE_MAILBOX_KHR,
+    ename:VK_PRESENT_MODE_FIFO_KHR or
     ename:VK_PRESENT_MODE_FIFO_RELAXED_KHR, pname:imageUsage must: be a
     subset of the supported usage flags present in the
     pname:supportedUsageFlags member of the slink:VkSurfaceCapabilitiesKHR
@@ -511,6 +514,13 @@ endif::VK_VERSION_1_1,VK_KHR_get_physical_device_properties2[]
     pname:presentMode must: be one of the elink:VkPresentModeKHR values
     returned by fname:vkGetPhysicalDeviceSurfacePresentModesKHR for the
     surface
+ifdef::VK_EXT_present_mode_fifo_latest_ready[]
+  * [[VUID-VkSwapchainCreateInfoKHR-presentModeFifoLatestReady-10161]]
+    If the <<features-presentModeFifoLatestReady,
+    pname:presentModeFifoLatestReady>> feature is not enabled,
+    pname:presentMode must: not be
+    ename:VK_PRESENT_MODE_FIFO_LATEST_READY_EXT
+endif::VK_EXT_present_mode_fifo_latest_ready[]
 ifdef::VK_VERSION_1_1,VK_KHR_device_group[]
   * [[VUID-VkSwapchainCreateInfoKHR-physicalDeviceCount-01429]]
 ifndef::VKSC_VERSION_1_0[]

chapters/accelstructures.adoc

@@ -176,6 +176,39 @@ object is active in the source acceleration structure but would be inactive
 in the destination, or vice versa.
 
 
+[[acceleration-structure-degenerate-prims]]
+=== Degenerate Primitives and Instances
+
+_Degenerate_ primitives and instances behave differently to
+<<acceleration-structure-inactive-prims,inactive primitives and instances>>,
+and are defined as:
+
+  * triangles that have one or more vertices whose respective (X), (Y), (Z)
+    components are identical, or have three vertices that have at least two
+    of the (X), (Y), or (Z) components identical, therefore forming a line
+    or point.
+    Degenerate triangles do not generate any intersections.
+  * AABBs whose pname:minX=pname:maxX, pname:minY=pname:maxY, and
+    pname:minZ=pname:maxZ.
+    Degenerate AABBs may: invoke the intersection shader.
+  * instances that reference bottom level acceleration structures that
+    contain no active primitives.
+    When building an acceleration structure, implementations should: treat
+    degenerate instances as though they are a point at the instance origin,
+    specified by slink:VkAccelerationStructureInstanceKHR::pname:transform.
+
+Unlike _inactive_ primitives and instances, _degenerate_ primitives and
+instances may: transition from the degenerate to the non-degenerate state,
+or vice versa, when performing an acceleration structure update.
+
+If an acceleration structure is built without
+ename:VK_BUILD_ACCELERATION_STRUCTURE_ALLOW_UPDATE_BIT_KHR set in
+slink:VkAccelerationStructureBuildGeometryInfoKHR::pname:flags, degenerate
+primitives may: be discarded.
+Primitives that are defined with the same index value for more than one
+vertex can: always be discarded.
+
+
 [[acceleration-structure-building]]
 === Building Acceleration Structures
 

chapters/cmdbuffers.adoc

@@ -2043,7 +2043,7 @@ ifdef::VK_NV_external_sci_sync,VK_NV_external_sci_sync2[]
   * [[VUID-VkSemaphoreSubmitInfoKHR-semaphore-05094]]
     If pname:semaphore has a payload of stext:NvSciSyncObj, pname:value
     must: be calculated by application via <<NvSciSync-extension-page,
-    NvSciSync APIs>>.
+    NvSciSync APIs>>
 endif::VK_NV_external_sci_sync,VK_NV_external_sci_sync2[]
 
 ****