Hello Quest

This is a minimal example project for Linux that renders a colored cube to the Oculus Quest, and requires neither Android Studio nor Gradle to build.

Instead of using Android Studio or Gradle, the project contains a build script that uses the build tools included with the Android SDK directly.

The project source code is based on the VrCubeWorld_NativeActivity sample from the Oculus Quest SDK, but heavily modified to only include the absolute minimum functionality required to render a single cube. In particular, I've removed support for:

• Multithreading
• Multiviews
• Multisampling
• Clamp to border textures
• Instancing

The resulting code is less than 1000 lines, and should serve as a useful starting point for those wanting to get started with native development on the Quest

Instead of linking separately against the android_native_app_glue library (which provides the bindings between a NativeActivity in Java and our C code), I've added the headers and source code for this library to the project directly.

Prerequisites

I assume that the following packages are installed and the corresponding environment variables point to their location:

• Android SDK (ANDROID_HOME)
• Android NDK (NDK_HOME)
• Java Runtime Environment (JRE) (JAVA_HOME)
• Oculus Mobile SDK (OVR_HOME)

In particular, I've used version 1.25.0 of the Oculus Mobile SDK. I've used version 26 of the Android SDK, version 28.0.3 of the build tools, and version 20.0.5594570 of the NDK, because these are versions used by the samples in the Oculus Mobile SDK.

I've used the version of the JRE that ships with the latest Android Studio. Note that this is probably not a hard requirement. If you already have a recent version of the JRE Environment installed, you should be able to just use that and avoid having to install Android Studio altogether.

Usage

I've created several shell scripts that allow you to build, install, start, and stop the application on the Quest.

All these scripts assume that the Android SDK platform tools are in your PATH. To add the Android SDK platform tools to your path, run:

export PATH=$ANDROID_HOME/platform-tools:$PATH

To build the application, run:

build.sh

The subsequent steps require that the Quest is connected to your machine over USB.

To install the application, run:

install.sh

To start the application, run:

./start.sh

To stop the application, run:

./stop.sh