vkGetPhysicalDeviceOpticalFlowImageFormatsNV

To enumerate the supported image formats for a specific optical flow usage, call:

VkResult vkGetPhysicalDeviceOpticalFlowImageFormatsNV(
    VkPhysicalDevice physicalDevice,
    const VkOpticalFlowImageFormatInfoNV* pOpticalFlowImageFormatInfo,
    uint32_t* pFormatCount,
    VkOpticalFlowImageFormatPropertiesNV* pImageFormatProperties);

• physicalDevice is the physical device being queried.
• pOpticalFlowImageFormatInfo is a pointer to a VkOpticalFlowImageFormatInfoNV structure specifying the optical flow usage for which information is returned.
• pFormatCount is a pointer to an integer related to the number of optical flow properties available or queried, as described below.
• pImageFormatProperties is a pointer to an array of VkOpticalFlowImageFormatPropertiesNV structures in which supported formats and image parameters are returned.

If pImageFormatProperties is NULL, then the number of optical flow properties supported for the given physicalDevice is returned in pFormatCount. Otherwise, pFormatCount must point to a variable set by the application to the number of elements in the pImageFormatProperties array, and on return the variable is overwritten with the number of values actually written to pImageFormatProperties. If the value of pFormatCount is less than the number of optical flow properties supported, at most pFormatCount values will be written to pImageFormatProperties, and VK_INCOMPLETE will be returned instead of VK_SUCCESS, to indicate that not all the available values were returned.

Before creating an image to be used as an optical flow frame, obtain the supported image creation parameters by querying with vkGetPhysicalDeviceFormatProperties2 and vkGetPhysicalDeviceImageFormatProperties2 using one of the reported formats and adding VkOpticalFlowImageFormatInfoNV to the pNext chain of VkPhysicalDeviceImageFormatInfo2.

When querying the parameters with vkGetPhysicalDeviceImageFormatProperties2 for images used for optical flow operations, the VkOpticalFlowImageFormatInfoNV::usage field must contain one or more of the bits defined in VkOpticalFlowUsageFlagBitsNV.