### [Matrix](https://matrix.org/docs/guides/introduction)
[![#darkplaces:matrix.org](https://img.shields.io/matrix/darkplaces:matrix.org?color=660000&label=%23darkplaces%3Amatrix.org)](https://matrix.to/#/#darkplaces:matrix.org)
+## Downloading and running
+
+Linux x86_64 builds are available in [GitHub CI](https://github.com/DarkPlacesEngine/darkplaces/actions?query=branch%3Amaster) artifacts.
+
+More complete builds are available in [xonotic.org](https://beta.xonotic.org/autobuild/) engine zips.
+These support Windows, Linux and macOS, and include the current libraries needed for all features.
+
+DarkPlaces supports many Quake-based games and you can select which it will run by renaming the executable so it's prefixed with the game's name, for example `rogue-sdl.exe`, or by passing a cmdline argument
+such as `-rogue`. This changes various engine behaviours and cvar defaults to suit the game.
+The supported list and related details are defined in [com_game.c](https://github.com/DarkPlacesEngine/darkplaces/blob/master/com_game.c).
+
+Mods which aren't listed there can be run with (for example) `-game quake15` in which case DP will use the same behaviours and cvar defaults as for id1 Quake.
+
+## Quake Virtual File System
+
+All of Quake's data access is through a hierarchical file system, the contents
+of the file system can be transparently merged from several sources.
+
+The "base directory" is the path to the directory holding the quake.exe and
+all game directories. This can be overridden with the "-basedir" command
+line parm to allow code debugging in a different directory. The base
+directory is only used during filesystem initialization.
+
+The "game directory" is the first tree on the search path and directory that
+all generated files (savegames, screenshots, demos, config files) will be
+saved to. This can be overridden with the "-game" command line parameter.
+If multiple "-game <gamedir>" args are passed the last one is the "primary"
+and files will be saved there, the rest are read-only.
+
## Build instructions (WIP)
These instructions are adequate for Quake, but for Xonotic please refer to [its wiki](https://gitlab.com/xonotic/xonotic/-/wikis/Compiling).
### Required packages
The minimum SDL version is 2.0.18 for Linux and 2.24.0 for Windows.
+The supported compilers are GCC and Clang.
The following package names are for Debian, see below for Windows and Mac.
##### Client
Build (mandatory): `build-essential` `libjpeg-dev` `zlib1g-dev`
Runtime (optional): `libcurl` `libpng`
-### Windows (MSYS2):
+### Windows (MSYS2 MinGW):
1. Install MSYS2, found [here](https://www.msys2.org/).
2. Once you've installed MSYS2 and have fully updated it, open a MinGW64 terminal (***not an MSYS2 terminal***) and input the following command:
### Unix (General)
-From a terminal, in the engine's root directory, input `make`. On macOS, input `make` with a target such as `make sdl-release`.
-
-Input `make help` for options.
+From a terminal, in the engine's root directory, input `make help` to list the targets.
+To build the main executable, input `make sdl-release` which creates the file called
+`darkplaces-sdl` or `darkplaces-sdl.exe` (Windows).
If you get errors (that don't seem to be about missing dependencies) try `make clean` before compiling, especially if you updated your system since the last time you compiled.
-### Windows (Visual Studio)
+### Windows (Visual Studio 2019)
+
+Not recommended due to poor support for C standards, and lack of maintenance.
+
+DarkPlaces requires C11, so Windows SDK 10.0.20348.0 or later is needed.
+To install it, run the Visual Studio Installer, click "Modify", click "Individual components", type "Windows SDK" in the search box, select the latest Windows SDK and de-select older versions.
+You will also need "NuGet package manager" selected (to download SDL2 headers the first time you build).
+Click "Modify" to apply the changes.
+
+Open `darkplaces-vs2019.sln`, select build type (`Debug` or `Release`) and platform (`Win32` or `x64`), and choose "Build Solution" from the "Build" menu to create files `darkplaces-sdl2-vs2019.exe` and `SDL2.dll`.
+
+The Release build crashes. The Debug x64 build doesn't crash (but is rather slow) so this will be Fun for someone to debug.
+
+To get a build suitable for playing you'll need to use MinGW GCC, or download the autobuild from Xonotic (see above).
-May work but not recommended due to lack of support for C standards, and lack of maintenance.
-Instructions TODO.
## Contributing