Registered Extension Number

329

Revision

1

Ratification Status

Not ratified

Extension and Version Dependencies

VK_KHR_spirv_1_4

Contact

Extension Proposal

VK_EXT_mesh_shader

Other Extension Metadata

Last Modified Date

2022-01-20

Interactions and External Dependencies
Contributors

  • Christoph Kubisch, NVIDIA

  • Pat Brown, NVIDIA

  • Jeff Bolz, NVIDIA

  • Daniel Koch, NVIDIA

  • Piers Daniell, NVIDIA

  • Pierre Boudier, NVIDIA

  • Patrick Mours, NVIDIA

  • David Zhao Akeley, NVIDIA

  • Kedarnath Thangudu, NVIDIA

  • Timur Kristóf, Valve

  • Hans-Kristian Arntzen, Valve

  • Philip Rebohle, Valve

  • Mike Blumenkrantz, Valve

  • Slawomir Grajewski, Intel

  • Michal Pietrasiuk, Intel

  • Mariusz Merecki, Intel

  • Tom Olson, ARM

  • Jan-Harald Fredriksen, ARM

  • Sandeep Kakarlapudi, ARM

  • Ruihao Zhang, QUALCOMM

  • Ricardo Garcia, Igalia, S.L.

  • Tobias Hector, AMD

  • Stu Smith, AMD

Description

This extension provides a new mechanism allowing applications to generate collections of geometric primitives via programmable mesh shading. It is an alternative to the existing programmable primitive shading pipeline, which relied on generating input primitives by a fixed function assembler as well as fixed function vertex fetch.

This extension also adds support for the following SPIR-V extension in Vulkan:

New Commands

New Structures

New Enum Constants

  • VK_EXT_MESH_SHADER_EXTENSION_NAME

  • VK_EXT_MESH_SHADER_SPEC_VERSION

  • Extending VkPipelineStageFlagBits:

    • VK_PIPELINE_STAGE_MESH_SHADER_BIT_EXT

    • VK_PIPELINE_STAGE_TASK_SHADER_BIT_EXT

  • Extending VkQueryPipelineStatisticFlagBits:

    • VK_QUERY_PIPELINE_STATISTIC_MESH_SHADER_INVOCATIONS_BIT_EXT

    • VK_QUERY_PIPELINE_STATISTIC_TASK_SHADER_INVOCATIONS_BIT_EXT

  • Extending VkQueryType:

    • VK_QUERY_TYPE_MESH_PRIMITIVES_GENERATED_EXT

  • Extending VkShaderStageFlagBits:

    • VK_SHADER_STAGE_MESH_BIT_EXT

    • VK_SHADER_STAGE_TASK_BIT_EXT

  • Extending VkStructureType:

    • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_MESH_SHADER_FEATURES_EXT

    • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_MESH_SHADER_PROPERTIES_EXT

If VK_NV_device_generated_commands is supported:

New or Modified Built-In Variables

  • CullPrimitiveEXT

  • PrimitivePointIndicesEXT

  • PrimitiveLineIndicesEXT

  • PrimitiveTriangleIndicesEXT

  • (modified)Position

  • (modified)PointSize

  • (modified)ClipDistance

  • (modified)CullDistance

  • (modified)PrimitiveId

  • (modified)Layer

  • (modified)ViewportIndex

  • (modified)NumWorkgroups

  • (modified)WorkgroupSize

  • (modified)WorkgroupId

  • (modified)LocalInvocationId

  • (modified)GlobalInvocationId

  • (modified)LocalInvocationIndex

  • (modified)NumSubgroups

  • (modified)SubgroupId

  • (modified)DrawIndex

  • (modified)PrimitiveShadingRateKHR

  • (modified)ViewIndex

New SPIR-V Capability

Version History

  • Revision 1, 2022-03-08 (Christoph Kubisch, Daniel Koch, Patrick Mours)

    • Initial revision

See Also

VkDrawMeshTasksIndirectCommandEXT, VkPhysicalDeviceMeshShaderFeaturesEXT, VkPhysicalDeviceMeshShaderPropertiesEXT, vkCmdDrawMeshTasksEXT, vkCmdDrawMeshTasksIndirectCountEXT, vkCmdDrawMeshTasksIndirectEXT

Document Notes

For more information, see the Vulkan Specification

This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.

Copyright

Copyright 2014-2023 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0