Promoted to Vulkan 1.1
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Promoted to Vulkan 1.1 Core
John Kessenich, Google
Neil Henning, Codeplay
David Neto, Google
Daniel Koch, Nvidia
Graeme Leese, Broadcom
Weifeng Zhang, Qualcomm
Stephen Clarke, Imagination Technologies
Jason Ekstrand, Intel
Jesse Hall, Google
VK_KHR_variable_pointers extension allows implementations to indicate
their level of support for the
SPV_KHR_variable_pointers SPIR-V extension.
The SPIR-V extension allows shader modules to use invocation-private
pointers into uniform and/or storage buffers, where the pointer values can
be dynamic and non-uniform.
SPV_KHR_variable_pointers extension introduces two capabilities.
VariablePointersStorageBuffer, must be supported by all
implementations of this extension.
VariablePointers, is optional.
All functionality in this extension is included in core Vulkan 1.1, with the
KHR suffix omitted, however support for the
variablePointersStorageBuffer feature is made optional.
The original type, enum and command names are still available as aliases of
the core functionality.
1) Do we need an optional property for the SPIR-V
VariablePointersStorageBuffer capability or should it be mandatory when
this extension is advertised?
RESOLVED: Add it as a distinct feature, but make support mandatory. Adding it as a feature makes the extension easier to include in a future core API version. In the extension, the feature is mandatory, so that presence of the extension guarantees some functionality. When included in a core API version, the feature would be optional.
2) Can support for these capabilities vary between shader stages?
RESOLVED: No, if the capability is supported in any stage it must be supported in all stages.
3) Should the capabilities be features or limits?
RESOLVED: Features, primarily for consistency with other similar extensions.
For more information, see the Vulkan Specification
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Copyright (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.