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//! <https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VK_KHR_device_group_creation.html>
use crate::prelude::*;
use crate::vk;
use core::mem;
use core::ptr;
impl crate::khr::device_group_creation::Instance {
/// Retrieve the number of elements to pass to [`enumerate_physical_device_groups()`][Self::enumerate_physical_device_groups()]
#[inline]
pub unsafe fn enumerate_physical_device_groups_len(&self) -> VkResult<usize> {
let mut group_count = mem::MaybeUninit::uninit();
(self.fp.enumerate_physical_device_groups_khr)(
self.handle,
group_count.as_mut_ptr(),
ptr::null_mut(),
)
.assume_init_on_success(group_count)
.map(|c| c as usize)
}
///
/// Call [`enumerate_physical_device_groups_len()`][Self::enumerate_physical_device_groups_len()] to query the number of elements to pass to `out`.
/// Be sure to [`Default::default()`]-initialize these elements and optionally set their `p_next` pointer.
#[inline]
pub unsafe fn enumerate_physical_device_groups(
&self,
out: &mut [vk::PhysicalDeviceGroupProperties<'_>],
) -> VkResult<()> {
let mut count = out.len() as u32;
(self.fp.enumerate_physical_device_groups_khr)(self.handle, &mut count, out.as_mut_ptr())
.result()?;
assert_eq!(count as usize, out.len());
Ok(())
}
}