audio settings menu

src/frontend/menu/menu_settings.cpp

@@ -11,7 +11,42 @@
 
 using namespace gui;
 
+static void create_volume_trackbar(
+    std::shared_ptr<Panel> panel,
+    const std::wstring& name,
+    float* field
+) {
+    panel->add(menus::create_label([=]() {
+        return langs::get(name, L"settings")+L": " + 
+            std::to_wstring(int(*field*100))+L"%";
+    }));
+
+    auto trackbar = std::make_shared<TrackBar>(0.0, 1.0, 1.0, 0.01, 5);
+    trackbar->setSupplier([=]() {
+        return *field;
+    });
+    trackbar->setConsumer([=](double value) {
+        *field = value; 
+    });
+    panel->add(trackbar);
+}
+
+void create_audio_settings_panel(Engine* engine) {
+    auto menu = engine->getGUI()->getMenu();
+    auto panel = menus::create_page(engine, "settings-audio", 400, 0.0f, 1);
+
+    auto& settings = engine->getSettings().audio;
+    create_volume_trackbar(panel, L"Master Volume", &settings.volumeMaster);
+    create_volume_trackbar(panel, L"Regular Sounds", &settings.volumeRegular);
+    create_volume_trackbar(panel, L"UI Sounds", &settings.volumeUI);
+    create_volume_trackbar(panel, L"Ambient", &settings.volumeAmbient);
+    create_volume_trackbar(panel, L"Music", &settings.volumeMusic);
+    panel->add(guiutil::backButton(menu));
+}
+
 void menus::create_settings_panel(Engine* engine) {
+    create_audio_settings_panel(engine);
+
     auto menu = engine->getGUI()->getMenu();
     auto panel = menus::create_page(engine, "settings", 400, 0.0f, 1);
 
@@ -125,6 +160,7 @@ void menus::create_settings_panel(Engine* engine) {
         util::str2wstr_utf8(langName), 
         "languages", menu));
 
+    panel->add(guiutil::gotoButton(L"Audio", "settings-audio", menu));
     panel->add(guiutil::gotoButton(L"Controls", "controls", menu));
     panel->add(guiutil::backButton(menu));
 }