VK_KHR_shader_float_controls2

Other Extension Metadata

Last Modified Date

2023-05-16

Interactions and External Dependencies

• This extension requires SPV_KHR_float_controls2.

Contributors

• Graeme Leese, Broadcom

Description

This extension enables use of the more expressive fast floating-point math flags in the SPV_KHR_float_controls2 extension. These flags give finer- grained control over which optimizations compilers may apply, potentially speeding up execution while retaining correct results.

The extension also adds control over the fast-math modes to the GLSL extended instruction set, making these operations more consistent with SPIR-V and allowing their use in situations where floating-point conformance is important.

New Structures

• Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:
  • VkPhysicalDeviceShaderFloatControls2FeaturesKHR

New Enum Constants

• VK_KHR_SHADER_FLOAT_CONTROLS_2_EXTENSION_NAME
• VK_KHR_SHADER_FLOAT_CONTROLS_2_SPEC_VERSION
• Extending VkStructureType:
  • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_FLOAT_CONTROLS_2_FEATURES_KHR

New SPIR-V Capabilities

• FloatControls2

Promotion to Vulkan 1.4

Functionality in this extension is included in core Vulkan 1.4 with the KHR suffix omitted. The original type, enum and command names are still available as aliases of the core functionality.

Version History

• Revision 1, 2023-05-16 (Graeme Leese)
  • Initial draft