cleaned up code and made DefaultXrPlugins

src/graphics/vulkan.rs

@@ -9,7 +9,7 @@ use bevy::prelude::*;
 use bevy::render::renderer::{RenderAdapter, RenderAdapterInfo, RenderDevice, RenderQueue};
 use bevy::window::RawHandleWrapper;
 use openxr as xr;
-use wgpu::{Instance, Texture};
+use wgpu::Instance;
 
 use crate::input::XrInput;
 use crate::resources::{
@@ -40,7 +40,7 @@ pub fn initialize_xr_graphics(
 )> {
     use wgpu_hal::{api::Vulkan as V, Api};
 
-    let xr_entry = xr::Entry::linked();
+    let xr_entry = super::xr_entry();
 
     let available_extensions = xr_entry.enumerate_extensions()?;
     assert!(available_extensions.khr_vulkan_enable2);