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Change log for August 16, 2024 Vulkan 1.3.293 spec update:
Public Issues
* Fix reference to VkPhysicalDeviceLimits::maxMemoryAllocationCount in
VkMemoryAllocateInfo (public issue 2398).
* Improve vkWriteMicromapsPropertiesEXT VUs 07573 and 07574, and remove
incomplete VU 07575 (public issue 2399).
* Fix markup in vkGetPhysicalDeviceDisplayPropertiesKHR so
VkDisplayPropertiesKHR is formatted as a link (public issue 2401).
* Merge multiple equivalent require blocks in XML and add a script to
detect them (public pull request 2404).
Internal Issues
* Refactor and clarify a NOTE in VkSparseMemoryBind (internal issue 3938).
* Require VK_EXT_sample_locations for vkCmdSetSampleLocationsEXT in common
draw VU 06666 (internal issue 3944).
* Update `scripts/extdependency.py` to compute version dependencies, and
use this in the `makeSpec` script instead of a hardcoded list of version
tokens required for the requested API version (internal MR 6823).
* Add glossary entries for basic video coding block types (internal merge
request 6765).
* Add depthBoundsTestEnable language to the <<features-depthBounds,
depthBounds>> feature description (internal merge request 6806).
* Clarify VK_VALIDATION_FEATURE_DISABLE_SHADERS_EXT to better explain
exactly what it is disabling (internal merge request 6812).
* Fix VkLayerSettingEXT spec language and VU for VK_EXT_layer_settings
(internal merge request 6817).
* Use consistent wording to describe features including removal of
un-needed "`set to`" when referring to a value that is not being set
(internal merge request 6831).
New Extensions
* VK_NV_command_buffer_inheritance- Loading branch information
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,62 @@ | ||
| // Copyright 2024 The Khronos Group Inc. | ||
| // | ||
| // SPDX-License-Identifier: CC-BY-4.0 | ||
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| include::{generated}/meta/{refprefix}VK_NV_command_buffer_inheritance.adoc[] | ||
| === Other Extension Metadata | ||
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| *Last Modified Date*:: | ||
| 2024-02-15 | ||
| *IP Status*:: | ||
| No known IP claims. | ||
| *Contributors*:: | ||
| - Piers Daniell, NVIDIA | ||
| - Daniel Story, Nintendo | ||
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| === Description | ||
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| This extension allows applications to take advantage of the graphics and | ||
| compute state that remains valid in the queue between executions of | ||
| submitted command buffers. | ||
| This works across both primary and secondary command buffers. | ||
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| The state inherited includes the previously bound pipeline state, previously | ||
| bound shader objects, previously bound vertex and index buffers, previously | ||
| bound descriptor sets and push constants, and all previously set dynamic | ||
| state. | ||
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| This extension relaxes the requirement that all that state needs to be bound | ||
| and set after begin command buffer and before the next draw or dispatch. | ||
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| By not having to set state that has been inherited applications can save | ||
| both CPU and GPU cycles by not having to set state redundantly, and also | ||
| have improved flexibility when reusing secondary command buffers. | ||
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| include::{generated}/interfaces/VK_NV_command_buffer_inheritance.adoc[] | ||
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| === Issues | ||
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| 1) How can the validation layer know when state is valid at draw or dispatch | ||
| time if it is inherited at execution time? | ||
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| *RESOLVED*: Validation of invalid state at draw and dispatch time cannot be | ||
| done while recording those commands. | ||
| Instead the validation layer will need to keep track of any unset state when | ||
| draw and dispatch commands are recorded, but not report an error at that | ||
| time. | ||
| It should also keep track of what state is valid at the end of each recorded | ||
| command buffer. | ||
| When secondary command buffer execution is recorded the validation layer can | ||
| update its unset state tracking for that command buffer, and also for draw | ||
| and dispatch commands recorded after execution of the secondary as they will | ||
| inherit state from the executed secondary. | ||
| This can be done recursively so every recorded primary command buffer has a | ||
| final tally of any unset state used at draw and dispatch time. | ||
| Finally when the primary is submitted to the queue the validation layer will | ||
| know the previous primaries submitted to the queue and will know if there is | ||
| any unset state used and can report the error then. | ||
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| === Version History | ||
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| * Revision 1, 2024-02-15 (Lujin Wang) | ||
| ** Internal revisions |
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