pub type FnGetAccelerationStructureBuildSizesKHR = extern "system" fn(device: Device, buildType: AccelerationStructureBuildTypeKHR, pBuildInfo: *const AccelerationStructureBuildGeometryInfoKHR, pMaxPrimitiveCounts: *const u32, pSizeInfo: *mut AccelerationStructureBuildSizesInfoKHR);