dolphin: updates to build and configuration

Modified the module to update the dependencies and improve the initial configuration

* Build changes:
   -  build dependencies modified to include SDL2. Latest version (as of Jan 2024) enable SDL2 by default on Linux and use it for input auto-configuration.
      Gamepads detected using SDL's GameController API are automatically configred based on their mappings.
   - disable analytics and update support durign the build. Updates are handled by RetroPie-Setup and - unfortunately - analytics require a keyboard/mouse to get over the initial agreement pop-up that is presented to the user on the 1st run.

* Configuration updates:
   - on KMS systems, start Dolphin via X11 by using the `XINIT-WM` launc prefix, which instructs `runcommand` to start a minimal desktop env.
   - change the location of the configuration folder, since now Dolphin follows the XDG specs and uses `$XDG_CONFIG_HOME` to store its settings.
     It will not affect existing installations, since we symlink-it to the configuration folder anyway and Dolphin will look in the previous location first.
   - pre-set a few initial configuration options in the main `Dolphin.ini` configuration file, upating existing options
   - add a new pre-set for the graphics backend configuration file in `GFX.ini` to switch to GLES3 on platforms where it is available.
     It should help the Pi5 but also other SBCs we support (i.e. OrangePi5 / RK3399) to startw the correct rendering backend.
   - set the '-gui' variant as default. Since the 'nogui' doesn't seem to read the configuration files correctly (i.e. no Fullscreen or Hotkeys are working), use the main program started with '--batch' to run a game

scriptmodules/emulators/dolphin.sh

@@ -48,6 +48,12 @@ function depends_dolphin() {
     else
         depends+=(qtbase5-private-dev)
     fi
+    # on KMS use x11 to start the emulator
+    isPlatform "kms" && depends+=(xorg matchbox-window-manager)
+
+    # if using the latest version, add SDL2 as dependency, since it's mandatory
+    [[ "$(_get_commit_dolphin)" == "" ]] && depends+=(libsdl2-dev)
+
     getDepends "${depends[@]}"
 }
 
@@ -58,8 +64,8 @@ function sources_dolphin() {
 function build_dolphin() {
     mkdir build
     cd build
-    # use the bundled 'speexdsp' libs, distro versions before 1.2.1 produce a 'cmake' error
-    cmake .. -DBUNDLE_SPEEX=ON -DCMAKE_INSTALL_PREFIX="$md_inst"
+    # use the bundled 'speexdsp' libs, distro versions before 1.2.1 trigger a 'cmake' error
+    cmake .. -DBUNDLE_SPEEX=ON -DENABLE_AUTOUPDATE=OFF -DENABLE_ANALYTICS=OFF  -DUSE_DISCORD_PRESENCE=OFF -DCMAKE_INSTALL_PREFIX="$md_inst"
     make clean
     make
     md_ret_require="$md_build/build/Binaries/dolphin-emu"
@@ -74,23 +80,38 @@ function configure_dolphin() {
     mkRomDir "gc"
     mkRomDir "wii"
 
-    moveConfigDir "$home/.dolphin-emu" "$md_conf_root/gc"
+    local launch_prefix
+    isPlatform "kms" && launch_prefix="XINIT-WM:"
+
+    addEmulator 0 "$md_id" "gc" "$launch_prefix$md_inst/bin/dolphin-emu-nogui -e %ROM%"
+    addEmulator 1 "$md_id-gui" "gc" "$launch_prefix$md_inst/bin/dolphin-emu -b -e %ROM%"
+    addEmulator 0 "$md_id" "wii" "$launch_prefix$md_inst/bin/dolphin-emu-nogui -e %ROM%"
+    addEmulator 1 "$md_id-gui" "wii" "$launch_prefix$md_inst/bin/dolphin-emu -b -e %ROM%"
+
+    addSystem "gc"
+    addSystem "wii"
 
+    [[ "$md_mode" == "remove" ]] && return
+
+    moveConfigDir "$home/.config/dolphin-emu" "$md_conf_root/gc"
+    mkUserDir "$md_conf_root/gc/Config"
+    # preset a few options on a first installation
     if [[ ! -f "$md_conf_root/gc/Config/Dolphin.ini" ]]; then
-        mkdir -p "$md_conf_root/gc/Config"
         cat >"$md_conf_root/gc/Config/Dolphin.ini" <<_EOF_
 [Display]
-FullscreenResolution = Auto
+FullscreenDisplayRes = Auto
 Fullscreen = True
+RenderToMain = True
+KeepWindowOnTop = True
 _EOF_
-        chown -R $user:$user "$md_conf_root/gc/Config"
+    fi
+    # use the GLES(3) render path on platforms where it's available
+    if [[ ! -f "$md_conf_root/gc/Config/GFX.ini" ]] && isPlatform "gles3"; then
+        cat >"$md_conf_root/gc/Config/GFX.ini" <<_EOF2_
+[Settings]
+PreferGLES = True
+_EOF2_
     fi
 
-    addEmulator 1 "$md_id" "gc" "$md_inst/bin/dolphin-emu-nogui -e %ROM%"
-    addEmulator 0 "$md_id-gui" "gc" "$md_inst/bin/dolphin-emu -b -e %ROM%"
-    addEmulator 1 "$md_id" "wii" "$md_inst/bin/dolphin-emu-nogui -e %ROM%"
-    addEmulator 0 "$md_id-gui" "wii" "$md_inst/bin/dolphin-emu -b -e %ROM%"
-
-    addSystem "gc"
-    addSystem "wii"
+    chown -R $user:$user "$md_conf_root/gc/Config"
 }