[+] Hide sides on gitadora 𝛿 (#705)

## Description of change
Added an option to only disable the left/right screens of gitadora gw
delta while exposing the touch panel screen.

## Testing
Tested by hand on CachyOS + hyprland + gamescope + wine + vnc + phone +
cat 🐈‍⬛

<img width="2560" height="1707" alt="image"
src="https://github.com/user-attachments/assets/a2ef0172-68e2-43c2-89c3-4863698f2f00"
/>

src/spice2x/launcher/launcher.cpp

@@ -645,11 +645,26 @@ int main_implementation(int argc, char *argv[]) {
     if (options[launcher::Options::GitaDoraCabinetType].is_active()) {
         games::gitadora::CAB_TYPE = options[launcher::Options::GitaDoraCabinetType].value_uint32();
     }
+    if (options[launcher::Options::GitaDoraArenaWindowLayout].is_active()) {
+        if (GRAPHICS_WINDOWED) {
+            const auto window_count = options[launcher::Options::GitaDoraArenaWindowLayout].value_uint32();
+            if (window_count == 1) {
+                GRAPHICS_PREVENT_SECONDARY_WINDOW = true;
+            } else if (window_count == 2) {
+                GRAPHICS_GITADORA_HIDE_SIDE_WINDOWS = true;
+            }
+        } else {
+            log_warning("launcher", "-gdawindows only applies with -w; ignoring GitaDora Arena windowed layout");
+        }
+    }
     if (options[launcher::Options::GitaDoraArenaSingleWindow].value_bool()) {
-        // for full screen
-        GRAPHICS_FORCE_SINGLE_ADAPTER = true;
-        // for windowed
-        GRAPHICS_PREVENT_SECONDARY_WINDOW = true;
+        if (GRAPHICS_WINDOWED) {
+            GRAPHICS_PREVENT_SECONDARY_WINDOW = true;
+            GRAPHICS_GITADORA_HIDE_SIDE_WINDOWS = false;
+        } else {
+            GRAPHICS_FORCE_SINGLE_ADAPTER = true;
+            GRAPHICS_PREVENT_SECONDARY_WINDOW = true;
+        }
     }
     if (options[launcher::Options::GitaDoraWailHold].is_active()) {
         socd::TILT_HOLD_MS = options[launcher::Options::GitaDoraWailHold].value_uint32();

src/spice2x/launcher/options.cpp

@@ -1104,6 +1104,24 @@ static const std::vector<OptionDefinition> OPTION_DEFINITIONS = {
         .game_name = "GitaDora",
         .category = "Game Options",
     },
+    {
+        // GitaDoraArenaWindowLayout
+        .title = "GitaDora Arena Windowed Layout (EXPERIMENTAL)",
+        .name = "gdawindows",
+        .desc = "For Arena Model windowed mode (-w): select how many windows to create.\n\n"
+            "4 windows: main + LEFT + RIGHT + SMALL.\n\n"
+            "2 windows: main + SMALL.\n\n"
+            "1 window: main only; use the subscreen overlay for SMALL.\n\n"
+            "Ignored in fullscreen mode.",
+        .type = OptionType::Enum,
+        .game_name = "GitaDora",
+        .category = "Game Options",
+        .elements = {
+            {"4", "4 windows"},
+            {"2", "2 windows"},
+            {"1", "1 window"},
+        },
+    },
     {
         // GitaDoraLefty
         .title = "GitaDora Lefty Guitar (for Digital Wailing)",

src/spice2x/launcher/options.h

@@ -110,6 +110,7 @@ namespace launcher {
             GitaDoraTwoChannelAudio,
             GitaDoraCabinetType,
             GitaDoraArenaSingleWindow,
+            GitaDoraArenaWindowLayout,
             GitaDoraLefty,
             GitaDoraWailHold,
             GitaDoraPickAlgo,