# VkPhysicalDeviceOpticalFlowPropertiesNV(3) Manual Page

## Name

VkPhysicalDeviceOpticalFlowPropertiesNV - Structure describing properties supported by VK_NV_optical_flow

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## C Specification

The `VkPhysicalDeviceOpticalFlowPropertiesNV` structure is defined as:

    // Provided by VK_NV_optical_flow
    typedef struct VkPhysicalDeviceOpticalFlowPropertiesNV {
        VkStructureType                 sType;
        void*                           pNext;
        VkOpticalFlowGridSizeFlagsNV    supportedOutputGridSizes;
        VkOpticalFlowGridSizeFlagsNV    supportedHintGridSizes;
        VkBool32                        hintSupported;
        VkBool32                        costSupported;
        VkBool32                        bidirectionalFlowSupported;
        VkBool32                        globalFlowSupported;
        uint32_t                        minWidth;
        uint32_t                        minHeight;
        uint32_t                        maxWidth;
        uint32_t                        maxHeight;
        uint32_t                        maxNumRegionsOfInterest;
    } VkPhysicalDeviceOpticalFlowPropertiesNV;

## Members

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `supportedOutputGridSizes` are the supported VkOpticalFlowGridSizeFlagsNV which can be specified in `VkOpticalFlowSessionCreateInfoNV`::`outputGridSize`.

- `supportedHintGridSizes` are the supported VkOpticalFlowGridSizeFlagsNV which can be specified in `VkOpticalFlowSessionCreateInfoNV`::`hintGridSize`.

- `hintSupported` is a boolean describing whether using hint flow vector map is supported in an optical flow session.

- `costSupported` is a boolean describing whether cost map generation is supported in an optical flow session.

- `bidirectionalFlowSupported` is a boolean describing whether bi-directional flow generation is supported in an optical flow session.

- `globalFlowSupported` is a boolean describing whether global flow vector map generation is supported in an optical flow session.

- `minWidth` is the minimum width in pixels for images used in an optical flow session.

- `minHeight` is the minimum height in pixels for images used in an optical flow session.

- `maxWidth` is the maximum width in pixels for images used in an optical flow session.

- `maxHeight` is the maximum height in pixels for images used in an optical flow session.

- `maxNumRegionsOfInterest` is the maximum number of regions of interest which can be used in an optical flow session. If this `maxNumRegionsOfInterest` is 0, regions of interest are not supported in an optical flow session.

## Description

If the `VkPhysicalDeviceOpticalFlowPropertiesNV` structure is included in the `pNext` chain of the VkPhysicalDeviceProperties2 structure passed to vkGetPhysicalDeviceProperties2, it is filled in with each corresponding implementation-dependent property.

Valid Usage (Implicit)

- VUID-VkPhysicalDeviceOpticalFlowPropertiesNV-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_OPTICAL_FLOW_PROPERTIES_NV`

## See Also

VK_NV_optical_flow, VkBool32, VkOpticalFlowGridSizeFlagsNV, 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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0