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* Bump API patch number and header version number to 61 for this update. Github Issues: * Provide alternate length attributes (altlen=) in the XML schema, for those using length attributes to generate code instead of documentation (public issue 555). * Fix erroneous references to `latex:` being used for asciidoc math markup, rather than `latexmath:` (public pull request 556). * Add author ID to XML for Kazan software renderer (public pull request 557). Internal Issues: * Add the <<fundamentals-abi,Application Binary Interface>> section describing platform ABI requirements and recommendations, add examples of function and function pointer declarations to the <<boilerplate-platform-specific-calling-conventions, Platform-Specific Calling Conventions>> section, and remove related language that existed elsewhere in the specification (internal issue 64). * Describe where to document valid usage interactions of chained structures in the style guide, and fix one case now appearing in slink:VkBufferCreateInfo instead of the child slink:VkDedicatedAllocationBufferCreateInfoNV structure (internal issue 715). * Add example to the style guide of describing enumerated types which are empty when the spec is built without relevant extensions enabled, and apply it to existing examples for elink:VkDescriptorSetLayoutCreateFlagBits and elink:VkSubpassDescriptionFlagBits (internal issue 864). * Add a note to the <<fundamentals-validusage-enums, Valid Usage for Enumerated Types>> section that the special values suffixed with etext:_BEGIN_RANGE, etext:_END_RANGE, etext:_RANGE_SIZE and etext:_MAX_ENUM are not part of the API and should: not be used by applications (internal issue 872). * Added note to flink:vkCmdUpdateBuffers explaining the performance penalty for copies done in this way, and why the upper copy limit is what it is (internal issue 952). * Update `VK_KHX_device_group` to split some functionality into the new `VK_KHR_bind_memory2` extension, and rename that functionality (internal issue 969). * Remove *Status* fields from extension appendices, since they are by definition published and complete by the time they reach the public github repository (internal issue 973). Other Issues: * Update Data Format specification dependency to version 1.2 and change references to DF sections accordingly. * Update XML to make the pname:pAllocator parameter of flink:vkRegisterDeviceEventEXT and flink:vkRegisterDisplayEventEXT in the `VK_EXT_display_control` extension as optional. New Extensions: * `VK_KHR_bind_memory2` * `VK_KHR_image_format_list` * `VK_KHR_maintenance2` * `VK_KHR_sampler_ycbcr_conversion`
109 lines
3.6 KiB
Plaintext
109 lines
3.6 KiB
Plaintext
include::meta/VK_EXT_shader_subgroup_ballot.txt[]
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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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