Add non-headless singleplayer tests to CI

util/test_singleplayer.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+# Runs a singleplayer session with software-rendering.
+
+dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+gameid=${gameid:-devtest}
+executable=$dir/../bin/luanti
+testspath=$dir/../tests
+conf_client=$testspath/client.conf
+worldpath=$testspath/world
+
+[ -e "$executable" ] || { echo "executable $executable missing"; exit 1; }
+
+rm -rf "$worldpath"
+mkdir -p "$worldpath/worldmods"
+
+# enable a lot of visual effects so we can catch shader errors and other obvious bugs
+printf '%s\n' >"$conf_client" \
+	screen_w=384 screen_h=256 fps_max=5 \
+	active_block_range=1 viewing_range=40 helper_mode=devtest \
+	opengl_debug=true mip_map=true enable_waving_{leaves,plants,water}=true \
+	enable_{auto_exposure,bloom,dynamic_shadows,translucent_foliage,volumetric_lighting}=true \
+	shadow_map_color=true antialiasing=ssaa \
+	"${clientconf:-}"
+
+ln -s "$dir/helper_mod" "$worldpath/worldmods/"
+
+export ALSOFT_DRIVERS=null
+export LIBGL_ALWAYS_SOFTWARE=true
+export MESA_DEBUG=1
+timeout 25 "$executable" --config "$conf_client" --go --world "$worldpath" --gameid "$gameid" --info
+r=$?
+echo "Exit status: $r"
+[ $r -eq 124 ] && echo "(timed out)"
+[ $r -ne 0 ] && exit 1
+
+echo "Success"
+exit 0