# VkPhysicalDeviceFloatControlsProperties(3) Manual Page

## Name

VkPhysicalDeviceFloatControlsProperties - Structure describing properties supported by VK_KHR_shader_float_controls

## C Specification

The `VkPhysicalDeviceFloatControlsProperties` structure is defined as:

    typedef struct VkPhysicalDeviceFloatControlsProperties {
        VkStructureType                      sType;
        void*                                pNext;
        VkShaderFloatControlsIndependence    denormBehaviorIndependence;
        VkShaderFloatControlsIndependence    roundingModeIndependence;
        VkBool32                             shaderSignedZeroInfNanPreserveFloat16;
        VkBool32                             shaderSignedZeroInfNanPreserveFloat32;
        VkBool32                             shaderSignedZeroInfNanPreserveFloat64;
        VkBool32                             shaderDenormPreserveFloat16;
        VkBool32                             shaderDenormPreserveFloat32;
        VkBool32                             shaderDenormPreserveFloat64;
        VkBool32                             shaderDenormFlushToZeroFloat16;
        VkBool32                             shaderDenormFlushToZeroFloat32;
        VkBool32                             shaderDenormFlushToZeroFloat64;
        VkBool32                             shaderRoundingModeRTEFloat16;
        VkBool32                             shaderRoundingModeRTEFloat32;
        VkBool32                             shaderRoundingModeRTEFloat64;
        VkBool32                             shaderRoundingModeRTZFloat16;
        VkBool32                             shaderRoundingModeRTZFloat32;
        VkBool32                             shaderRoundingModeRTZFloat64;
    } VkPhysicalDeviceFloatControlsProperties;

or the equivalent

    typedef VkPhysicalDeviceFloatControlsProperties VkPhysicalDeviceFloatControlsPropertiesKHR;

## Members

The members of the `VkPhysicalDeviceFloatControlsProperties` structure describe the following implementation-dependent limits:

## Description

- `denormBehaviorIndependence` is a VkShaderFloatControlsIndependence value indicating whether, and how, denorm behavior can be set independently for different bit widths.

- `roundingModeIndependence` is a VkShaderFloatControlsIndependence value indicating whether, and how, rounding modes can be set independently for different bit widths.

- `shaderSignedZeroInfNanPreserveFloat16` is a boolean value indicating whether sign of a zero, Nans and \(\pm\infty\) can be preserved in 16-bit floating-point computations. It also indicates whether the `SignedZeroInfNanPreserve` execution mode can be used for 16-bit floating-point types.

- `shaderSignedZeroInfNanPreserveFloat32` is a boolean value indicating whether sign of a zero, Nans and \(\pm\infty\) can be preserved in 32-bit floating-point computations. It also indicates whether the `SignedZeroInfNanPreserve` execution mode can be used for 32-bit floating-point types.

- `shaderSignedZeroInfNanPreserveFloat64` is a boolean value indicating whether sign of a zero, Nans and \(\pm\infty\) can be preserved in 64-bit floating-point computations. It also indicates whether the `SignedZeroInfNanPreserve` execution mode can be used for 64-bit floating-point types.

- `shaderDenormPreserveFloat16` is a boolean value indicating whether denormals can be preserved in 16-bit floating-point computations. It also indicates whether the `DenormPreserve` execution mode can be used for 16-bit floating-point types.

- `shaderDenormPreserveFloat32` is a boolean value indicating whether denormals can be preserved in 32-bit floating-point computations. It also indicates whether the `DenormPreserve` execution mode can be used for 32-bit floating-point types.

- `shaderDenormPreserveFloat64` is a boolean value indicating whether denormals can be preserved in 64-bit floating-point computations. It also indicates whether the `DenormPreserve` execution mode can be used for 64-bit floating-point types.

- `shaderDenormFlushToZeroFloat16` is a boolean value indicating whether denormals can be flushed to zero in 16-bit floating-point computations. It also indicates whether the `DenormFlushToZero` execution mode can be used for 16-bit floating-point types.

- `shaderDenormFlushToZeroFloat32` is a boolean value indicating whether denormals can be flushed to zero in 32-bit floating-point computations. It also indicates whether the `DenormFlushToZero` execution mode can be used for 32-bit floating-point types.

- `shaderDenormFlushToZeroFloat64` is a boolean value indicating whether denormals can be flushed to zero in 64-bit floating-point computations. It also indicates whether the `DenormFlushToZero` execution mode can be used for 64-bit floating-point types.

- `shaderRoundingModeRTEFloat16` is a boolean value indicating whether an implementation supports the round-to-nearest-even rounding mode for 16-bit floating-point arithmetic and conversion instructions. It also indicates whether the `RoundingModeRTE` execution mode can be used for 16-bit floating-point types.

- `shaderRoundingModeRTEFloat32` is a boolean value indicating whether an implementation supports the round-to-nearest-even rounding mode for 32-bit floating-point arithmetic and conversion instructions. It also indicates whether the `RoundingModeRTE` execution mode can be used for 32-bit floating-point types.

- `shaderRoundingModeRTEFloat64` is a boolean value indicating whether an implementation supports the round-to-nearest-even rounding mode for 64-bit floating-point arithmetic and conversion instructions. It also indicates whether the `RoundingModeRTE` execution mode can be used for 64-bit floating-point types.

- `shaderRoundingModeRTZFloat16` is a boolean value indicating whether an implementation supports the round-towards-zero rounding mode for 16-bit floating-point arithmetic and conversion instructions. It also indicates whether the `RoundingModeRTZ` execution mode can be used for 16-bit floating-point types.

- `shaderRoundingModeRTZFloat32` is a boolean value indicating whether an implementation supports the round-towards-zero rounding mode for 32-bit floating-point arithmetic and conversion instructions. It also indicates whether the `RoundingModeRTZ` execution mode can be used for 32-bit floating-point types.

- `shaderRoundingModeRTZFloat64` is a boolean value indicating whether an implementation supports the round-towards-zero rounding mode for 64-bit floating-point arithmetic and conversion instructions. It also indicates whether the `RoundingModeRTZ` execution mode can be used for 64-bit floating-point types.

| editing-note Implementations may not be able to control behavior of denorms for floating-point atomics. This needs to be taken into account when such atomics will be added to Vulkan.

If the `VkPhysicalDeviceFloatControlsProperties` structure is included in the `pNext` chain of VkPhysicalDeviceProperties2, it is filled with the implementation-dependent limits.

Valid Usage (Implicit)

- `sType` must be `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FLOAT_CONTROLS_PROPERTIES`

## See Also

`VkBool32`, VkShaderFloatControlsIndependence, VkStructureType

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.