Add snapcraft configuration to build snaps

snap/gui/openspades.desktop

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+[Desktop Entry]
+Version=1.0
+Type=Application
+Terminal=false
+Exec=openspades %U
+Name=OpenSpades
+GenericName=Sandbox building and FPS videogame
+Comment=Open-source clone of Ace of Spades
+Keywords=game;fps;sandbox;voxel;aos;
+Icon=${SNAP}/meta/gui/openspades.png
+Categories=Game;ActionGame;
+MimeType=x-scheme-handler/aos;

snap/scripts/launch_openspades

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+#!/bin/bash
+case "$SNAP_ARCH" in
+	"amd64") ARCH='x86_64-linux-gnu'
+	;;
+	"i386") ARCH='i386-linux-gnu'
+	;;
+	*)
+		echo "Unsupported architecture for this app build"
+		exit 1
+	;;
+esac
+
+if [ ! -f $SNAP_USER_DATA/.local/share/openspades/Resources ];
+then
+  mkdir -p $SNAP_USER_DATA/.local/share/openspades/Resources
+	cp $SNAP/share/games/openspades/Resources/* $SNAP_USER_DATA/.local/share/openspades/Resources
+	echo cl_checkForUpdates: 1 > $SNAP_USER_DATA/.local/share/openspades/Resources/SPConfig.cfg
+	echo s_eax: 1 >> $SNAP_USER_DATA/.local/share/openspades/Resources/SPConfig.cfg
+fi
+
+
+export LD_LIBRARY_PATH=$SNAP/usr/lib/$ARCH:$LD_LIBRARY_PATH
+
+# XKB config
+export XKB_CONFIG_ROOT=$SNAP/usr/share/X11/xkb
+
+export LD_LIBRARY_PATH=$SNAP/usr/lib/$ARCH/pulseaudio:$LD_LIBRARY_PATH
+
+# Mesa Libs
+export LD_LIBRARY_PATH=$SNAP/usr/lib/$ARCH/mesa:$LD_LIBRARY_PATH
+export LD_LIBRARY_PATH=$SNAP/usr/lib/$ARCH/mesa-egl:$LD_LIBRARY_PATH
+
+# XDG Config
+export XDG_CONFIG_DIRS=$SNAP/etc/xdg:$XDG_CONFIG_DIRS
+export XDG_CONFIG_DIRS=$SNAP/usr/xdg:$XDG_CONFIG_DIRS
+# Note: this doesn't seem to work, QML's LocalStorage either ignores
+# or fails to use $SNAP_USER_DATA if defined here
+export XDG_DATA_DIRS=$SNAP_USER_DATA:$XDG_DATA_DIRS
+export XDG_DATA_DIRS=$SNAP/usr/share:$XDG_DATA_DIRS
+
+# Workaround in snapd for proprietary nVidia drivers mounts the drivers in
+# /var/lib/snapd/lib/gl that needs to be in LD_LIBRARY_PATH
+export LD_LIBRARY_PATH=/var/lib/snapd/lib/gl:$LD_LIBRARY_PATH
+
+# Not good, needed for fontconfig
+export XDG_DATA_HOME=$SNAP_USER_DATA/usr/share
+
+# Font Config
+export FONTCONFIG_PATH=$SNAP/etc/fonts/config.d
+export FONTCONFIG_FILE=$SNAP/etc/fonts/fonts.conf
+
+# Tell libGL where to find the drivers
+export LIBGL_DRIVERS_PATH=$SNAP/usr/lib/$ARCH/dri
+
+# Necessary for the SDK to find the translations directory
+export APP_DIR=$SNAP
+
+# Use GTK styling for running under Unity 7
+export DESKTOP_SESSION=ubuntu
+export XDG_SESSION_DESKTOP=ubuntu
+export XDG_CURRENT_DESKTOP=Unity
+
+#export LIBGL_DEBUG="verbose"
+
+export XLOCALEDIR="$SNAP/usr/share/X11/locale"
+export LOCPATH="$SNAP/usr/lib/locale"
+
+$SNAP/games/openspades "$@"

snap/snapcraft.yaml

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+name: openspades
+version: 'master'
+summary: Sandbox building and FPS videogame
+description: |
+  OpenSpades is a compatible client of Ace of Spades 0.75.
+  Can connect to a vanilla/pyspades/pysnip server.
+  Uses OpenGL/AL for better experience.
+  Open source, and cross platform.
+
+grade: stable
+confinement: strict
+
+apps:
+  openspades:
+    command: launch_openspades
+    plugs:
+      - network
+      - network-bind
+      - opengl
+      - x11
+      - pulseaudio
+
+parts:
+  scripts:
+    plugin: dump
+    source: snap/scripts
+    organize:
+      'launch_openspades': bin/
+  openspades:
+    plugin: cmake
+    configflags: [-DCMAKE_BUILD_TYPE=RelWithDebInfo]
+    source: .
+    build-packages:
+      - clang
+      - imagemagick
+      - wget
+      - zip
+      - unzip
+      - pkg-config
+      - libglew-dev
+      - libcurl4-openssl-dev
+      - libsdl2-dev
+      - libsdl2-image-dev
+      - libalut-dev
+      - xdg-utils
+      - libfreetype6-dev
+      - libopus-dev
+      - libopusfile-dev
+      - libjpeg-dev
+      - libxinerama-dev
+      - libxft-dev
+    stage-packages:
+      - libgl1-mesa-dri
+      - libgl1-mesa-glx
+      - libglew1.13
+      - libopenal1