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How to Build and Run

Building

Python v3.6+ may be required

If you are building from most repostories: (specifically, the OpenXR-SDK-Source repository, the OpenXR-CTS repository, or the internal Khronos GitLab OpenXR repository) Certain source files are generated at build time from the xr.xml file, utilizing Python scripts. The scripts make use of the Python pathlib module, which is fully supported in Python version 3.6 or later.

You will also need the Python jinja2 package, available from your package manager or with something like pip3 install jinja2. Most OpenXR repositories include a bundled copy of this, but if you see errors about Jinja, this would be one approach to try.

If you are building the OpenXR-SDK repository: all source files have been pre-generated for you, and only the OpenXR headers and loader are included.

CMake

The project is a relatively standard CMake-based project. You might consider the official CMake User Interaction Guide if you're new to building CMake-based projects. The instructions below can mostly be skimmed to find the dependencies

Windows

Building the OpenXR components in this tree on Windows is supported using Visual Studio 2013 and newer. If you are using Visual Studio 2019, you can simply "Open folder" and use the built-in CMake support. Other environments, such as VS Code, that can have CMake support installed and use the Visual Studio toolchains, should also work:

When generating the solutions/projects using CMake, be sure to use the correct compiler version number. The following table is provided to help you:

Visual Studio Version Number
Visual Studio 2013 12
Visual Studio 2015 14
Visual Studio 2017 15
Visual Studio 2019 16

Windows 64-bit

First, generate the 64-bit solution and project files using CMake:

mkdir build\win64
cd build\win64
cmake -G "Visual Studio [Version Number] Win64" ../..

Finally, open the build\win64\OPENXR.sln in the Visual Studio to build the samples.

VS2019

For VS2019 the above may complain and say to split out the arch into -A '[arch]'. This -A parameter must be set to x64, not Win64:

mkdir build\win64
cd build\win64
cmake -G "Visual Studio [Version Number]" -A x64 ../..

VS2019 includes CMake tools, which can be installed through the Visual Studio Installer -> Modify -> Individual Components -> C++ CMake tools for Windows. To get the right paths for msbuild.exe and cmake.exe, you can launch through Start -> Visual Studio 2019 -> x64 Native Tools Command Prompt For VS 2019.

Windows 32-bit

First, generate the 32-bit solution and project files using CMake:

mkdir build\win32
cd build\win32
cmake -G "Visual Studio [Version Number]" ../..

Open the build\win32\OPENXR.sln in the Visual Studio to build the samples.

(Optional) Building the OpenXR Loader as a DLL

The OpenXR loader is built as a static library by default on Windows. To instead build as a dynamic link library, define the cmake option DYNAMIC_LOADER=ON. e.g. for Win64, replace the CMake line shown above with:

cmake -DDYNAMIC_LOADER=ON -G "Visual Studio [Version Number] Win64" ../..

Note that even if built as a dynamic library, the loader should not be installed system-wide on Windows or Android.

Linux

The following set of packages provides all required libs for building for xlib or xcb with OpenGL and Vulkan support.

  • build-essential
  • cmake
  • libgl1-mesa-dev
  • libvulkan-dev
  • libx11-xcb-dev
  • libxcb-dri2-0-dev
  • libxcb-glx0-dev
  • libxcb-icccm4-dev
  • libxcb-keysyms1-dev
  • libxcb-randr0-dev
  • libxrandr-dev
  • libxxf86vm-dev
  • mesa-common-dev

Linux Debug

mkdir -p build/linux_debug
cd build/linux_debug
cmake -DCMAKE_BUILD_TYPE=Debug ../..
make

Linux Release (with debug symbols)

mkdir -p build/linux_release
cd build/linux_release
cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo ../..
make

Running the HELLO_XR sample

OpenXR runtime installation

An OpenXR runtime must first be installed before running the hello_xr sample. The runtime is an implementation of the OpenXR API, typically tailored to a specific device and distributed by the device manufacturer. Publicly-available runtimes are listed on the main OpenXR landing page at https://www.khronos.org/openxr

Configuring the OpenXR Loader

On Windows and Android, the OpenXR loader is distributed with the application, not installed to the system. On Linux, the loader is available from many distributions already, and may be installed system-wide.

XR_RUNTIME_JSON environment variable

The OpenXR loader looks in system-specific locations for the JSON file active_runtime.json, which describes the default installed OpenXR runtime. To override the default selection, you may define an environment variable XR_RUNTIME_JSON to select a different runtime, or a runtime which has not been installed in the default location.

For example, you might set XR_RUNTIME_JSON to <build_dir>/test/runtime/my_custom_runtime.json to select an OpenXR runtime described by JSON file my_custom_runtime.json.

Running the hello_xr Test

The binary for the hello_xr application is written to the <build_dir>/src/tests/hello_xr directory. Set your working directory to this directory and execute the hello_xr binary.

hello_xr with a dynamic loader (Windows)

When building a DLL version of the loader, the Visual Studio projects generated by CMake will copy the loader DLLs to the test application's (hello_xr) binary directory.