Package org.lwjgl.vulkan

Class VkAccelerationStructureMatrixMotionInstanceNV

  • All Implemented Interfaces:
    java.lang.AutoCloseable, org.lwjgl.system.NativeResource, org.lwjgl.system.Pointer
    public class VkAccelerationStructureMatrixMotionInstanceNV
extends org.lwjgl.system.Struct
implements org.lwjgl.system.NativeResource
    Structure specifying a single acceleration structure matrix motion instance for building into an acceleration structure geometry.
    Description

    The C language specification does not define the ordering of bit-fields, but in practice, this struct produces the correct layout with existing compilers. The intended bit pattern is for the following:

    • instanceCustomIndex and mask occupy the same memory as if a single uint32_t was specified in their place
      • instanceCustomIndex occupies the 24 least significant bits of that memory
      • mask occupies the 8 most significant bits of that memory
    • instanceShaderBindingTableRecordOffset and flags occupy the same memory as if a single uint32_t was specified in their place
      • instanceShaderBindingTableRecordOffset occupies the 24 least significant bits of that memory
      • flags occupies the 8 most significant bits of that memory

    If a compiler produces code that diverges from that pattern, applications must employ another method to set values according to the correct bit pattern.

    The transform for a matrix motion instance at a point in time is derived by component-wise linear interpolation of the two transforms. That is, for a time in [0,1] the resulting transform is

    transformT0 × (1 - time) + transformT1 × time
    Valid Usage (Implicit)
    • flags must be a valid combination of VkGeometryInstanceFlagBitsKHR values
    See Also

    VkAccelerationStructureMotionInstanceDataNV, VkTransformMatrixKHR

    Layout

    
 struct VkAccelerationStructureMatrixMotionInstanceNV {
     VkTransformMatrixKHR transformT0();
     VkTransformMatrixKHR transformT1();
     uint32_t instanceCustomIndex() : 24;
     uint32_t mask() : 8;
     uint32_t instanceShaderBindingTableRecordOffset() : 24;
     VkGeometryInstanceFlagsKHR flags() : 8;
     uint64_t accelerationStructureReference();
 }