Package org.lwjgl.vulkan

Class VkPastPresentationTimingGOOGLE

  • All Implemented Interfaces:
    java.lang.AutoCloseable, org.lwjgl.system.NativeResource, org.lwjgl.system.Pointer
    public class VkPastPresentationTimingGOOGLE
extends org.lwjgl.system.Struct
implements org.lwjgl.system.NativeResource
    Structure containing timing information about a previously-presented image.
    Description

    The results for a given swapchain and presentID are only returned once from vkGetPastPresentationTimingGOOGLE.

    The application can use the VkPastPresentationTimingGOOGLE values to occasionally adjust its timing. For example, if actualPresentTime is later than expected (e.g. one refreshDuration late), the application may increase its target IPD to a higher multiple of refreshDuration (e.g. decrease its frame rate from 60Hz to 30Hz). If actualPresentTime and earliestPresentTime are consistently different, and if presentMargin is consistently large enough, the application may decrease its target IPD to a smaller multiple of refreshDuration (e.g. increase its frame rate from 30Hz to 60Hz). If actualPresentTime and earliestPresentTime are same, and if presentMargin is consistently high, the application may delay the start of its input-render-present loop in order to decrease the latency between user input and the corresponding present (always leaving some margin in case a new image takes longer to render than the previous image). An application that desires its target IPD to always be the same as refreshDuration, can also adjust features until actualPresentTime is never late and presentMargin is satisfactory.

    See Also

    GetPastPresentationTimingGOOGLE

    Layout

    
 struct VkPastPresentationTimingGOOGLE {
     uint32_t presentID();
     uint64_t desiredPresentTime();
     uint64_t actualPresentTime();
     uint64_t earliestPresentTime();
     uint64_t presentMargin();
 }

    • Field Detail

      • SIZEOF

        The struct size in bytes.

      • ALIGNOF

        The struct alignment in bytes.

      • PRESENTID, DESIREDPRESENTTIME, ACTUALPRESENTTIME, EARLIESTPRESENTTIME, PRESENTMARGIN

        The struct member offsets.

    • Constructor Detail

      • VkPastPresentationTimingGOOGLE

        public VkPastPresentationTimingGOOGLE​(java.nio.ByteBuffer container)
        Creates a VkPastPresentationTimingGOOGLE instance at the current position of the specified ByteBuffer container. Changes to the buffer's content will be visible to the struct instance and vice versa.

        The created instance holds a strong reference to the container object.