add an openxr backend

Author: matthewjberger

Cargo.lock

@@ -11,6 +11,7 @@ name = "app_core"
 
 [dependencies]
 bytemuck = { version = "1.24.0", features = ["derive"] }
+clap = { version = "4.5", features = ["derive"] }
 egui = "0.33.0"
 egui-wgpu = { version = "0.33.0", features = ["winit"] }
 futures = "0.3.31"
@@ -19,14 +20,18 @@ nalgebra-glm = { version = "0.20.0", features = [
     "convert-bytemuck",
     "serde-serialize",
 ] }
+openxr = { version = "0.19", features = ["static", "loaded"], optional = true }
 web-time = "1.1.0"
 wgpu = { version = "27.0.1", default-features = false }
 winit = "0.30.12"
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+ash = { version = "0.38", optional = true }
 env_logger = "0.11.8"
 egui-winit = "0.33.0"
+gpu-allocator = { version = "0.27", optional = true }
 pollster = "0.4.0"
+wgpu-hal = { version = "27.0.4", optional = true }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 console_error_panic_hook = "0.1.7"
@@ -37,5 +42,6 @@ wasm-bindgen-futures = "0.4.55"
 
 [features]
 default = ["wgpu/default"]
+openxr = ["dep:openxr", "dep:ash", "dep:wgpu-hal", "dep:gpu-allocator"]
 webgl = ["wgpu/webgl"]
 webgpu = ["wgpu/webgpu"]

Cargo.toml

@@ -4,6 +4,8 @@ This project demonstrates how to setup a [rust](https://www.rust-lang.org/) proj
 that uses [wgpu](https://wgpu.rs/) to render a spinning triangle, supporting
 both webgl and webgpu [wasm](https://webassembly.org/) as well as native.
 
+It also includes an [OpenXR](https://www.khronos.org/openxr/) VR mode with hand tracking, procedural skybox, and infinite grid.
+
 > If you're looking for a Vulkan example, check out [the vulkan-example repo](https://github.com/matthewjberger/vulkan-example)
 >
 > If you're looking for an OpenGL example, check out [the opengl-example repo](https://github.com/matthewjberger/opengl-example)
@@ -12,7 +14,7 @@ both webgl and webgpu [wasm](https://webassembly.org/) as well as native.
 
 ## Quickstart
 
-```
+```bash
 # native
 cargo run -r
 
@@ -21,11 +23,26 @@ trunk serve --features webgpu --open
 
 # webgl
 trunk serve --features webgl --open
+
+# OpenXR VR mode
+just run-openxr
 ```
 
 > All chromium-based browsers like Brave, Vivaldi, Chrome, etc support wgpu.
 > Firefox also [supports wgpu](https://mozillagfx.wordpress.com/2025/07/15/shipping-webgpu-on-windows-in-firefox-141/) now starting with version `141`.
 
+## OpenXR VR Mode
+
+The OpenXR VR mode renders a spinning triangle, infinite grid, and procedural skybox in virtual reality with hand tracking.
+
+### Setup
+
+1. Install [SteamVR](https://store.steampowered.com/app/250820/SteamVR/)
+2. Install [Virtual Desktop](https://www.vrdesktop.net/) (or another OpenXR-compatible VR runtime)
+3. Start Virtual Desktop and stream your desktop to your VR headset
+4. On your desktop, run `just run-openxr`
+5. The application will appear in VR
+
 ## Prerequisites (web)
 
 * [trunk](https://trunkrs.dev/)

README.md

@@ -41,6 +41,10 @@ lint:
 run:
     cargo run -r
 
+# Run the desktop app in OpenXR mode
+run-openxr:
+    cargo run -r --features openxr -- --openxr
+
 # Build the app with wgpu + WebGL
 build-webgl:
     trunk build --features webgl