Class VkQueueFamilyProperties

  • All Implemented Interfaces:
    java.lang.AutoCloseable, NativeResource, Pointer

    public class VkQueueFamilyProperties
    extends Struct
    implements NativeResource
    Structure providing information about a queue family.
    Description

    The value returned in minImageTransferGranularity has a unit of compressed texel blocks for images having a block-compressed format, and a unit of texels otherwise.

    Possible values of minImageTransferGranularity are:

    • (0,0,0) which indicates that only whole mip levels must be transferred using the image transfer operations on the corresponding queues. In this case, the following restrictions apply to all offset and extent parameters of image transfer operations:
      • The x, y, and z members of a VkOffset3D parameter must always be zero.
      • The width, height, and depth members of a VkExtent3D parameter must always match the width, height, and depth of the image subresource corresponding to the parameter, respectively.
    • (Ax, Ay, Az) where Ax, Ay, and Az are all integer powers of two. In this case the following restrictions apply to all image transfer operations:
      • x, y, and z of a VkOffset3D parameter must be integer multiples of Ax, Ay, and Az, respectively.
      • width of a VkExtent3D parameter must be an integer multiple of Ax, or else x + width must equal the width of the image subresource corresponding to the parameter.
      • height of a VkExtent3D parameter must be an integer multiple of Ay, or else y + height must equal the height of the image subresource corresponding to the parameter.
      • depth of a VkExtent3D parameter must be an integer multiple of Az, or else z + depth must equal the depth of the image subresource corresponding to the parameter.
      • If the format of the image corresponding to the parameters is one of the block-compressed formats then for the purposes of the above calculations the granularity must be scaled up by the compressed texel block dimensions.

    Queues supporting graphics and/or compute operations must report (1,1,1) in minImageTransferGranularity, meaning that there are no additional restrictions on the granularity of image transfer operations for these queues. Other queues supporting image transfer operations are only required: to support whole mip level transfers, thus minImageTransferGranularity for queues belonging to such queue families may be (0,0,0).

    The Device Memory section describes memory properties queried from the physical device.

    For physical device feature queries see the Features chapter.

    See Also

    VkExtent3D, VkQueueFamilyProperties2, GetPhysicalDeviceQueueFamilyProperties

    Member documentation

    • queueFlags – a bitmask of VkQueueFlagBits indicating capabilities of the queues in this queue family.
    • queueCount – the unsigned integer count of queues in this queue family.
    • timestampValidBits – the unsigned integer count of meaningful bits in the timestamps written via CmdWriteTimestamp. The valid range for the count is 36..64 bits, or a value of 0, indicating no support for timestamps. Bits outside the valid range are guaranteed to be zeros.
    • minImageTransferGranularity – the minimum granularity supported for image transfer operations on the queues in this queue family.

    Layout

    
     struct VkQueueFamilyProperties {
         VkQueueFlags queueFlags;
         uint32_t queueCount;
         uint32_t timestampValidBits;
         VkExtent3D minImageTransferGranularity;
     }