Impl trait functions directly on EntryCustom/Instance/Device (#412)

* Implement EntryV1_x, InstanceV1_x, DeviceV1_x functions directly

ash-window/examples/winit.rs

@@ -5,7 +5,7 @@
 //!
 //! On instance extensions platform specific extensions need to be enabled.
 
-use ash::{version::EntryV1_0, vk};
+use ash::vk;
 use std::error::Error;
 
 fn main() -> Result<(), Box<dyn Error>> {

ash-window/src/lib.rs

@@ -1,9 +1,4 @@
-use ash::{
-    extensions::khr,
-    prelude::*,
-    version::{EntryV1_0, InstanceV1_0},
-    vk,
-};
+use ash::{extensions::khr, prelude::*, vk, EntryCustom, Instance};
 use raw_window_handle::{HasRawWindowHandle, RawWindowHandle};
 use std::ffi::CStr;
 
@@ -19,16 +14,12 @@ use ash::extensions::ext; // portability extensions
 /// In order for the created `SurfaceKHR` to be valid for the duration of its
 /// usage, the `Instance` this was called on must be dropped later than the
 /// resulting `SurfaceKHR`.
-pub unsafe fn create_surface<E, I>(
-    entry: &E,
-    instance: &I,
+pub unsafe fn create_surface<L>(
+    entry: &EntryCustom<L>,
+    instance: &Instance,
     window_handle: &dyn HasRawWindowHandle,
     allocation_callbacks: Option<&vk::AllocationCallbacks>,
-) -> VkResult<vk::SurfaceKHR>
-where
-    E: EntryV1_0,
-    I: InstanceV1_0,
-{
+) -> VkResult<vk::SurfaceKHR> {
     match window_handle.raw_window_handle() {
         #[cfg(target_os = "windows")]
         RawWindowHandle::Windows(handle) => {