Add Compiling guide;

guides/Compiling.md

@@ -0,0 +1,147 @@
+Compiling LÖVR
+===
+
+You might want to compile LÖVR from source so you can use LÖVR on other operating systems or create
+a custom build.  Below is a guide for setting up all the dependencies and compiling the code on
+various operating systems.
+
+Dependencies
+---
+
+- Lua or LuaJIT
+- GLFW (3.2+)
+- OpenGL (3.3, ES3, or WebGL 2)
+- assimp
+- OpenVR (1.0.9, for `lovr.headset`)
+- PhysicsFS
+- OpenAL (1.17+ recommended for HRTF support)
+- FreeType
+- msdfgen
+- ODE (for `lovr.physics`)
+- Emscripten (optional, for compiling for web)
+
+These can be found as submodules in the `deps` directory of the repository.  To initialize the
+submodules, clone LÖVR with the `--recursive` option or run this command in an existing repo:
+
+```sh
+git submodule update --init
+```
+
+Windows
+---
+
+From the `lovr` folder, run these commands to create a build folder and compile the project using
+CMake:
+
+```sh
+mkdir build
+cd build
+cmake ..
+cmake --build .
+```
+
+The executable will then exist at `/path/to/lovr/build/Debug/lovr.exe`.  A LÖVR project (a folder
+containing a `main.lua` script) can then be dropped onto `lovr.exe` to run it, or it can be run
+via the command line as `lovr.exe path/to/project`.
+
+macOS
+---
+
+Install the dependencies using your package manager of choice:
+
+```sh
+brew install assimp glfw3 luajit physfs freetype openal-soft ode
+```
+
+Next, build using CMake, as above:
+
+```sh
+mkdir build
+cd build
+cmake ..
+cmake --build .
+```
+
+The `lovr` executable should exist in `lovr/build` now.  It's recommended to set up an alias or
+symlink so that this executable exists on your path.  Once that's done, you can run a game like this:
+
+```sh
+lovr /path/to/myGame
+```
+
+Linux
+---
+
+On Arch Linux, first install necessary dependencies:
+
+```sh
+pacman -S assimp glfw-x11 luajit physfs freetype2 openal ode
+```
+
+Then, build with CMake:
+
+```sh
+mkdir build
+cd build
+cmake ..
+cmake --build .
+```
+
+On Linux, LÖVR needs to run within the Steam Runtime.  To do this, first [install
+Steam](https://wiki.archlinux.org/index.php/Steam#Installation).  Next, [install the Steam udev
+rules](https://github.com/ValveSoftware/SteamVR-for-Linux#usb-device-requirements).  Then, run LÖVR
+within the Steam runtime:
+
+```sh
+~/.steam/steam/ubuntu12_32/steam-runtime/run.sh lovr
+```
+
+If you receive errors related to `libstdc++`, set the `LD_PRELOAD` environment variable when running
+the command:
+
+```sh
+LD_PRELOAD='/usr/$LIB/libstdc++.so.6 /usr/$LIB/libgcc_s.so.1' ~/.steam/steam/ubuntu12_32/steam-runtime/run.sh lovr
+```
+
+Currently, there are performance issues between SteamVR and OpenGL apps.  These are being rapidly
+resolved with newer versions of graphics drivers and SteamVR.
+
+WebVR
+---
+
+First, install the Emscripten SDK.  Make sure you're running [this
+branch](https://github.com/bjornbytes/emscripten/tree/lovr) of Emscripten.
+
+Unix:
+
+```sh
+mkdir build
+cd build
+emcmake cmake -DCMAKE_BUILD_TYPE=Release ..
+emmake make -j2
+```
+
+Windows (from a Visual Studio Command Prompt, make sure the Emscripten SDK is on PATH):
+
+```sh
+mkdir build
+cd build
+emcmake cmake -G "NMake Makefiles" ..
+emmake nmake
+```
+
+The above commands will output `lovr.html`, `lovr.js`, and `lovr.js.mem`.  To package a game, run:
+
+```
+python /path/to/emscripten/tools/file_packager.py game.data --preload /path/to/game@/ --js-output=game.js
+```
+
+Which will output `game.js` and `game.data`.  The `lovr.html` file will need to be modified to
+include `game.js` in a script tag.
+
+Troubleshooting
+---
+
+- If you get "CMake no CMAKE_CXX_COMPILER found" on Windows, then install Visual Studio and create a
+  blank C++ project, which will prompt you to install the compilers and tools necessary to compile
+  LÖVR.

guides/init.lua

@@ -2,5 +2,6 @@ return {
   'Getting_Started',
   'Callbacks_and_Modules',
   'Libraries',
-  'Distribution'
+  'Distribution',
+  'Compiling'
 }