Add OpenXR + Wgpu example

This tests being able to write an OpenXR application based on
Wgpu (using the Vulkan HAL backend) for the Oculus Quest.

Author: rib

agdk-oboe/.idea/gradle.xml

@@ -11,22 +11,31 @@ To build for the Oculus Quest then you first need to download
 the Oculus OpenXR Mobile SDK from:
 https://developer.oculus.com/downloads/package/oculus-openxr-mobile-sdk/
 
-unpack the zip file and then set the OVR_OPENXR_LIBDIR environment variable
-to point at the directory with libopenxr_loader.so
+and after unpacking the zip file you need to copy a suitable `libopenxr_loader.so`
+library to `app/src/main/jniLibs/<abi>`
+
+For example if building for arm64-v8a:
+`cp path/to/ovr_openxr_mobile_sdk_42.0/OpenXR/Libs/Android/arm64-v8a/Debug/libopenxr_loader.so app/src/main/jniLibs/arm64-v8a`
 
 ```
-export export OVR_OPENXR_LIBDIR="path/to/ovr_openxr_mobile_sdk_42.0/OpenXR/Libs/Android/arm64-v8a/Debug"
 export ANDROID_NDK_HOME="path/to/ndk"
 export ANDROID_HOME="path/to/sdk"
 
 rustup target add aarch64-linux-android
 cargo install cargo-ndk
 
-cargo ndk -t arm64-v8a -o app/src/main/jniLibs/  build --features=android
+cargo ndk -t arm64-v8a -o app/src/main/jniLibs/ build
 ./gradlew build
 ./gradlew installDebug
 ```
 
+# Oculus Quest: Vulkan Validation Layer
+
+To enable the Vulkan validation layer on the Oculus Quest run:
+```
+adb shell setprop debug.oculus.loadandinjectpackagedvvl.co.realfit.naopenxrwgpu 1
+```
+
 # Desktop
 
 To build for PC you need to build with the "desktop" feature

na-openxr-info/README.md

@@ -1,6 +1,17 @@
-fn main()
-{
+fn main() {
     if std::env::var("CARGO_CFG_TARGET_OS").unwrap() == "android" {
-        println!("cargo:rustc-link-search={:}", std::env::var("OVR_OPENXR_LIBDIR").unwrap());
+        let android_abi = match std::env::var("CARGO_CFG_TARGET_ARCH").unwrap().as_str() {
+            "aarch64" => "arm64-v8a",
+            "arm" => "armeabi-v7a",
+            "x86" => "x86",
+            "x86_64" => "x86_64",
+            arch => {
+                panic!("Unsupported architecture for Android {arch}");
+            }
+        };
+
+        let libdir = std::path::Path::new(&std::env::var("CARGO_MANIFEST_DIR").unwrap())
+            .join(format!("app/src/main/jniLibs/{android_abi}/lib"));
+        println!("cargo:rustc-link-search={}", libdir.to_string_lossy());
     }
-}
+}

na-openxr-info/build.rs

@@ -1,5 +1,4 @@
 ///! Based on https://github.com/Ralith/openxrs/blob/master/openxr/examples/hello.rs
-
 use openxr as xr;
 
 #[cfg(target_os = "android")]
@@ -77,4 +76,4 @@ fn main() {
         .init();
 
     _main();
-}
+}

na-openxr-info/src/lib.rs

@@ -0,0 +1,22 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties
+*.so
+
+
+# Added by cargo
+
+/target
+Cargo.lock