godot: init at 2.1.1-stable

Adds the [godot engine](https://godotengine.org/) at the latest stable
version.

Produced binary contains the tools and the engine itself.

pkgs/development/tools/godot/default.nix

@@ -0,0 +1,40 @@
+{ stdenv, fetchFromGitHub, gcc, scons, pkgconfig, libX11, libXcursor
+, libXinerama, libXrandr, libXrender, freetype, openssl, alsaLib
+, libpulseaudio, mesa, mesa_glu, zlib }:
+
+stdenv.mkDerivation rec {
+  name    = "godot-${version}";
+  version = "2.1.1-stable";
+
+  src = fetchFromGitHub {
+    owner  = "godotengine";
+    repo   = "godot";
+    rev    = version;
+    sha256 = "071qkm1l6yn2s9ha67y15w2phvy5m5wl3wqvrslhfmnsir3q3k01";
+  };
+
+  buildInputs = [
+    gcc scons pkgconfig libX11 libXcursor libXinerama libXrandr libXrender
+    freetype openssl alsaLib libpulseaudio mesa mesa_glu zlib
+  ];
+
+  patches = [ ./pkg_config_additions.patch ];
+
+  enableParallelBuilding = true;
+
+  buildPhase = ''
+    scons platform=x11 prefix=$out -j $NIX_BUILD_CORES
+  '';
+
+  installPhase = ''
+    mkdir $out/bin -p
+    cp bin/godot.* $out/bin/
+  '';
+
+  meta = {
+    homepage    = "http://godotengine.org";
+    description = "Free and Open Source 2D and 3D game engine";
+    license     = stdenv.lib.licenses.mit;
+    platforms   = stdenv.lib.platforms.linux;
+  };
+}

pkgs/development/tools/godot/pkg_config_additions.patch

@@ -0,0 +1,12 @@
++++ build/platform/x11/detect.py
+@@ -132,6 +132,10 @@
+     env.ParseConfig('pkg-config xinerama --cflags --libs')
+     env.ParseConfig('pkg-config xcursor --cflags --libs')
+     env.ParseConfig('pkg-config xrandr --cflags --libs')
++    env.ParseConfig('pkg-config xrender --cflags --libs')
++    env.ParseConfig('pkg-config osmesa --cflags')
++    env.ParseConfig('pkg-config glu --cflags --libs')
++    env.ParseConfig('pkg-config zlib --cflags --libs')
+
+     if (env['builtin_openssl'] == 'no'):
+         env.ParseConfig('pkg-config openssl --cflags --libs')

pkgs/top-level/all-packages.nix

@@ -1938,6 +1938,8 @@ in
 
   gocryptfs = callPackage ../tools/filesystems/gocrypfs { };
 
+  godot = callPackage ../development/tools/godot {};
+
   go-mtpfs = callPackage ../tools/filesystems/go-mtpfs { };
 
   go-pup = callPackage ../development/tools/pup { };