Adjust shader test CI workflows

.github/workflows/linux.yml

@@ -96,7 +96,7 @@ jobs:
       - name: Install deps
         run: |
           source ./util/ci/common.sh
-          install_linux_deps clang-11
+          install_linux_deps clang-11 xvfb
 
       - name: Build
         run: |
@@ -104,13 +104,17 @@ jobs:
         env:
           CC: clang-11
           CXX: clang++-11
-          # Test fallback SHA implementations
-          CMAKE_FLAGS: '-DENABLE_OPENSSL=0'
+          # Test fallback SHA implementations, add GLES for the test
+          CMAKE_FLAGS: '-DENABLE_OPENSSL=0 -DENABLE_GLES2=ON'
 
       - name: Test
         run: |
           ./bin/luanti --run-unittests
 
+      - name: Singleplayer test (GLES)
+        run: |
+          clientconf="video_driver=ogles2" xvfb-run ./util/test_singleplayer.sh
+
   # Current clang version
   clang_18:
     runs-on: ubuntu-24.04
@@ -136,9 +140,9 @@ jobs:
         run: |
           ./util/test_multiplayer.sh
 
-      - name: Singleplayer test
+      - name: Singleplayer test (GL3)
         run: |
-          xvfb-run ./util/test_singleplayer.sh
+          clientconf="video_driver=opengl3" xvfb-run ./util/test_singleplayer.sh
 
   # Build with prometheus-cpp (server-only), also runs on ARM64
   clang_prometheus_arm:

.github/workflows/lua.yml

@@ -37,9 +37,9 @@ jobs:
       run: |
         serverconf="profiler.load=true" ./util/test_multiplayer.sh
 
-    - name: Singleplayer test (GL3)
+    - name: Singleplayer test
       run: |
-        clientconf="video_driver=opengl3" xvfb-run ./util/test_singleplayer.sh
+        xvfb-run ./util/test_singleplayer.sh
 
   luacheck:
     name: "Builtin Luacheck and Unit Tests"

util/test_singleplayer.sh

@@ -14,13 +14,20 @@ 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:-}"
+opts1=(
+	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
+	antialiasing=ssaa node_highlighting=halo
+)
+opts2=(
+	enable_{auto_exposure,bloom,dynamic_shadows,translucent_foliage,volumetric_lighting,water_reflections}=true
+	shadow_map_color=true
+)
+printf '%s\n' "${opts1[@]}" "${clientconf:-}" >"$conf_client"
+if ! grep -q 'video_driver *= *ogles2' "$conf_client"; then # no shadows on GLES
+	printf '%s\n' "${opts2[@]}" >>"$conf_client"
+fi
 
 ln -s "$dir/helper_mod" "$worldpath/worldmods/"