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df88ded281
* Bump API patch number and header version number to 60 for this update.
Github Issues:
* Document that <<queries-timestamps, Timestamp Queries>> can only be
meaningfully compared when they are written from the same queue (public
issue 216).
* Document that the `<extension>` tag `type` attribute is required for
non-disabled extensions (derived from, but does not close public issue
354).
* Clean up registry schema length attribute descriptions to be consistent
and correct (public issue 555).
Internal Issues:
* Replace as much of the hand-written extension appendix metadata as
possible with asciidoc includes generated from corresponding attributes
of +vk.xml+, and enhance the style guide to match. This avoids
inconsistencies between +vk.xml+ and the appendices, and produces a more
uniform style (internal issue 137).
* Remove the generated extDependency.{py,sh} files from the tree and
create them dynamically on demand instead, reducing merge conflicts
(internal issue 713).
* Add a prototype tool for generating in-place difference markup for
sections guarded by asciidoc conditionals, and new syntax for open
blocks to support it (internal issue 833).
* Remove unnecessary restriction of etext:*SYNC_FD_BIT_KHR external handle
types to the same physical device in the
slink:VkPhysicalDeviceIDPropertiesKHR,
flink:VkImportMemoryWin32HandleInfoKHR,
slink:VkImportFenceWin32HandleInfoKHR, slink:VkImportFenceFdInfoKHR,
slink:VkImportSemaphoreWin32HandleInfoKHR,
slink:VkImportSemaphoreFdInfoKHR
<<external-memory-handle-types-compatibility, External memory handle
types compatibility>>, <<external-semaphore-handle-types-compatibility,
External semaphore handle types compatibility>>, and
<<external-fence-handle-types-compatibility, External fence handle types
compatibility>> sections (internal issue 956).
Other Issues:
* Remove dependency of +VK_KHX_device_group+ on +VK_KHR_swapchain+ (there
is an interaction, but not a strict dependency), and add a new
`extension` attribute to the `<require` XML tag to allow classifying a
subset of interfaces of an extension as requiring another extension.
Update the registry schema and documentation accordingly.
New Extensions:
* `VK_AMD_shader_fragment_mask` (and related `GL_AMD_shader_fragment_mask`
GLSL extension)
* `VK_EXT_sample_locations`
* `VK_EXT_validation_cache`
111 lines
3.7 KiB
Plaintext
111 lines
3.7 KiB
Plaintext
include::meta/VK_EXT_shader_subgroup_ballot.txt[]
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*Status*::
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Draft
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*Last Modified Date*::
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2016-11-28
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*IP Status*::
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No known IP claims.
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*Interactions and External Dependencies*::
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- This extension requires the
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https://www.khronos.org/registry/spir-v/extensions/KHR/SPV_KHR_shader_ballot.html[+SPV_KHR_shader_ballot+]
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SPIR-V extension.
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- This extension requires the
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https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_shader_ballot.txt[+GL_ARB_shader_ballot+]
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extension for GLSL source languages.
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*Contributors*::
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- Jeff Bolz, NVIDIA
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- Neil Henning, Codeplay
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- Daniel Koch, NVIDIA Corporation
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This extension adds support for the following SPIR-V extension in Vulkan:
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* +SPV_KHR_shader_ballot+
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This extension provides the ability for a group of invocations, which
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execute in parallel, to do limited forms of cross-invocation communication
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via a group broadcast of a invocation value, or broadcast of a bitarray
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representing a predicate value from each invocation in the group.
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This extension provides access to a number of additional built-in shader
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variables in Vulkan:
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* code:SubgroupEqMaskKHR, which contains the subgroup mask of the current
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subgroup invocation,
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* code:SubgroupGeMaskKHR, which contains the subgroup mask of the
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invocations greater than or equal to the current invocation,
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* code:SubgroupGtMaskKHR, which contains the subgroup mask of the
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invocations greater than the current invocation,
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* code:SubgroupLeMaskKHR, which contains the subgroup mask of the
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invocations less than or equal to the current invocation,
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* code:SubgroupLtMaskKHR, which contains the subgroup mask of the
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invocations less than the current invocation,
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* code:SubgroupLocalInvocationId, which contains the index of an
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invocation within a subgroup, and
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* code:SubgroupSize, which contains the maximum number of invocations in a
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subgroup.
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Additionally, this extension provides access to the new SPIR-V instructions:
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* code:OpSubgroupBallotKHR,
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* code:OpSubgroupFirstInvocationKHR, and
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* code:OpSubgroupReadInvocationKHR,
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When using GLSL source-based shader languages, the following variables and
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shader functions from GL_ARB_shader_ballot can map to these SPIR-V built-in
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decorations and instructions:
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* in uint64_t gl_SubGroupEqMaskARB; -> code:SubgroupEqMaskKHR,
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* in uint64_t gl_SubGroupGeMaskARB; -> code:SubgroupGeMaskKHR,
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* in uint64_t gl_SubGroupGtMaskARB; -> code:SubgroupGtMaskKHR,
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* in uint64_t gl_SubGroupLeMaskARB; -> code:SubgroupLeMaskKHR,
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* in uint64_t gl_SubGroupLtMaskARB; -> code:SubgroupLtMaskKHR,
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* in uint gl_SubGroupInvocationARB; -> code:SubgroupLocalInvocationId,
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* uniform uint gl_SubGroupSizeARB; -> code:SubgroupSize,
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* ballotARB() -> code:OpSubgroupBallotKHR,
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* readFirstInvocationARB() -> code:OpSubgroupFirstInvocationKHR, and
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* readInvocationARB() -> code:OpSubgroupReadInvocationKHR.
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=== New Object Types
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None.
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=== New Enum Constants
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None.
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=== New Enums
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None.
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=== New Structures
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None.
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=== New Functions
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None.
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=== New Built-In Variables
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* <<interfaces-builtin-variables-sgeq,code:SubgroupEqMaskKHR>>
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* <<interfaces-builtin-variables-sgge,code:SubgroupGeMaskKHR>>
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* <<interfaces-builtin-variables-sggt,code:SubgroupGtMaskKHR>>
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* <<interfaces-builtin-variables-sgle,code:SubgroupLeMaskKHR>>
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* <<interfaces-builtin-variables-sglt,code:SubgroupLtMaskKHR>>
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* <<interfaces-builtin-variables-sgli,code:SubgroupLocalInvocationId>>
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* <<interfaces-builtin-variables-sgs,code:SubgroupSize>>
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=== New SPIR-V Capabilities
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* <<spirvenv-capabilities-table-subgroupballot,SubgroupBallotKHR>>
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=== Issues
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None.
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=== Version History
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* Revision 1, 2016-11-28 (Daniel Koch)
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- Initial draft
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