wait_semaphores function loading error

[KyleNBurke]

I can't seem to use the wait_semaphores() function, I'm getting a run time error.

thread 'main' panicked at 'Unable to load wait_semaphores', C:\Users\kylen\.cargo\registry\src\jackfan.us.kg-1ecc6299db9ec823\ash-0.30.0\src\vk.rs:7592:21
stack backtrace:
   0: core::fmt::write
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libcore\fmt\mod.rs:1052
   1: std::io::Write::write_fmt<std::sys::windows::stdio::Stderr>
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\io\mod.rs:1426
   2: std::sys_common::backtrace::_print
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\sys_common\backtrace.rs:62
   3: std::sys_common::backtrace::print
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\sys_common\backtrace.rs:49
   4: std::panicking::default_hook::{{closure}}
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\panicking.rs:204
   5: std::panicking::default_hook
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\panicking.rs:224
   6: std::panicking::rust_panic_with_hook
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\panicking.rs:472
   7: std::panicking::begin_panic<str*>
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\src\libstd\panicking.rs:399
   8: ash::vk::{{impl}}::load::wait_semaphores
             at C:\Users\kylen\.cargo\registry\src\jackfan.us.kg-1ecc6299db9ec823\ash-0.30.0\src\vk.rs:7592
   9: ash::vk::DeviceFnV1_2::wait_semaphores
             at C:\Users\kylen\.cargo\registry\src\jackfan.us.kg-1ecc6299db9ec823\ash-0.30.0\src\vk.rs:7782
  10: ash::device::DeviceV1_2::wait_semaphores<ash::device::Device>
             at C:\Users\kylen\.cargo\registry\src\jackfan.us.kg-1ecc6299db9ec823\ash-0.30.0\src\device.rs:146
  11: minimal_example::main
             at .\src\main.rs:12
  12: std::rt::lang_start::{{closure}}<()>
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\src\libstd\rt.rs:67
  13: std::rt::lang_start_internal::{{closure}}::{{closure}}
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\rt.rs:52
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
error: process didn't exit successfully: `target\debug\minimal_example.exe` (exit code: 101)

Here is a minimal code example.

use ash::{vk, version::EntryV1_0, version::InstanceV1_0, version::DeviceV1_2};

fn main() {
    let entry = ash::Entry::new().unwrap();
    let app_info = vk::ApplicationInfo::builder().api_version(vk::make_version(1, 2, 0));
    let create_info = vk::InstanceCreateInfo::builder().application_info(&app_info);
    let instance = unsafe { entry.create_instance(&create_info, None).unwrap() };
    let physical_device = unsafe { instance.enumerate_physical_devices().unwrap()[0] };
    let logical_device_create_info = vk::DeviceCreateInfo::builder();
    let logical_device = unsafe { instance.create_device(physical_device, &logical_device_create_info, None).unwrap() };
    let wait_info = vk::SemaphoreWaitInfo::builder();
    unsafe { logical_device.wait_semaphores(logical_device.handle(), &wait_info, std::u64::MAX).unwrap() };
}

I'm using Ash v0.30.0 and according to this comment on the PR for the wait_semaphores method implementation I should just be able to do device.wait_semaphores(device.handle(), &semaphore_wait_info, timeout)?; with vulkan 1.2 but for some reason I cannot.

Have I done something wrong here or is this a bug?

[Friz64]

Are you sure that your drivers support Vulkan 1.2? Mine do (RADV 20.0.4 with RX 580 on Linux) and your minimal code example runs fine. Maybe make sure that you are choosing the correct PhysicalDevice.

[Ralith]

Does seem odd that they aren't reporting an error on creating the instance, though.

e: ah, right, that'd be because the loader supports 1.2 but the driver doesn't. I guess you need to check the features for the device.

[KyleNBurke]

I just updated my drivers and I still get the error. They should support Vulkan 1.2, I have a Nvidia GeForce RTX 2070 Super. How can I determine that for certain?

e: oh I just found this: https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/vkEnumerateInstanceVersion.html

I'll see if 1.2 is there.

[Friz64]

A really useful tool i use a lot is vulkaninfo, it is included in the LunarG Vulkan SDK. Here's documentation on how to use it: https://vulkan.lunarg.com/doc/sdk/1.2.135.0/windows/vulkaninfo.html

[Friz64]

e: oh I just found this: https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/vkEnumerateInstanceVersion.html

I'll see if 1.2 is there.

As far as i know, this is just your Vulkan Instance Version, which is probably different from the supported Vulkan Version reported from the driver. You should be looking at this.

[Friz64]

If you prefer to display that information using ash, i wrote up this quick program.

use ash::{version::EntryV1_0, version::InstanceV1_0, vk};

fn main() {
    let entry = ash::Entry::new().unwrap();
    let app_info = vk::ApplicationInfo::builder().api_version(vk::make_version(1, 0, 0));
    let create_info = vk::InstanceCreateInfo::builder().application_info(&app_info);
    let instance = unsafe { entry.create_instance(&create_info, None).unwrap() };
    for physical_device in unsafe { instance.enumerate_physical_devices().unwrap() } {
        let properties = unsafe { instance.get_physical_device_properties(physical_device) };
        println!(
            "Physical Device {:?} supports Vulkan version {}.{}.{}",
            unsafe { std::ffi::CStr::from_ptr(properties.device_name.as_ptr()) },
            vk::version_major(properties.api_version),
            vk::version_minor(properties.api_version),
            vk::version_patch(properties.api_version)
        );
    }
}

[KyleNBurke]

@Friz64 vulkaninfo gives me 1.1.126 where your arrow is pointing. vkEnumerateInstanceVersion of course shows the same.

I bet it's because I didn't download the beta drivers found here:
https://developer.nvidia.com/vulkan-driver

I just downloaded from here:
https://www.nvidia.com/Download/index.aspx

I didn't realize Vulkan 1.2 is in beta, I will get the beta drivers and report back!

[Friz64]

vkEnumerateInstanceVersion of course shows the same.

I don't know how Vulkan is handled on Windows, but don't assume they will always be the same. On my system (Arch Linux) Vulkan Instance Version reports 1.2.135, but the PhysicalDevice's apiVersion shows 1.2.128. It's the version you should be interested in if you plan on using that version's features with that PhysicalDevice.

[KyleNBurke]

@Friz64 I see, thanks for the clarification. Installing the Nvidia beta drivers for Vulkan 1.2 fixed this issue, I appreciate all the help!

[Friz64]

Glad i could help :)