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VK_KHR_shader_float16_int8

Other Extension Metadata

Last Modified Date

2018-03-07

Interactions and External Dependencies
IP Status

No known IP claims.

Contributors
  • Alexander Galazin, Arm
  • Jan-Harald Fredriksen, Arm
  • Jeff Bolz, NVIDIA
  • Graeme Leese, Broadcom
  • Daniel Rakos, AMD

Description

The VK_KHR_shader_float16_int8 extension allows use of 16-bit floating-point types and 8-bit integer types in shaders for arithmetic operations.

It introduces two new optional features shaderFloat16 and shaderInt8 which directly map to the Float16 and the Int8 SPIR-V capabilities. The VK_KHR_shader_float16_int8 extension also specifies precision requirements for half-precision floating-point SPIR-V operations. This extension does not enable use of 8-bit integer types or 16-bit floating-point types in any shader input and output interfaces and therefore does not supersede the VK_KHR_8bit_storage or VK_KHR_16bit_storage extensions.

Promotion to Vulkan 1.2

All functionality in this extension is included in core Vulkan 1.2, with the KHR suffix omitted. However, if Vulkan 1.2 is supported and this extension is not, both the shaderFloat16 and shaderInt8 capabilities are optional. The original type, enum, and command names are still available as aliases of the core functionality.

Promotion to Vulkan 1.4

If Vulkan 1.4 is supported, support for the shaderInt8 capability is required.

New Structures

New Enum Constants

  • VK_KHR_SHADER_FLOAT16_INT8_EXTENSION_NAME
  • VK_KHR_SHADER_FLOAT16_INT8_SPEC_VERSION
  • Extending VkStructureType:
    • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FLOAT16_INT8_FEATURES_KHR
    • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_FLOAT16_INT8_FEATURES_KHR

Version History

  • Revision 1, 2018-03-07 (Alexander Galazin)
    • Initial draft