Add fullscreen mode

src/args.c

@@ -12,7 +12,7 @@ const char* app_releases_address = "https://github.com/X65/emu/releases";
 const char full_name[] = FULL_NAME;
 
 struct arguments arguments = {
-    NULL, "-", false, false, false, false, false, false, NULL, NULL,
+    NULL, "-", false, false, false, false, false, false, false, NULL, NULL,
 };
 static char args_doc[] = "[ROM.xex]";
 
@@ -32,6 +32,7 @@ static struct argp_option options[] = {
      OPTION_ARG_OPTIONAL, "Enable CRT post-process effect; optional VALUES is a comma-separated "
       "list of up to 6 floats: scanlines,mask,curvature,vignette,blur,gamma "
       "(empty positions keep current values)" },
+    { "fullscreen", 'f', 0, 0, "Start in fullscreen mode" },
     { 0 }
 };
 
@@ -53,6 +54,7 @@ static error_t parse_opt(int key, char* arg, struct argp_state* argp_state) {
                 args->crt_values = arg;
             }
             break;
+        case 'f': args->fullscreen = true; break;
 
         case 'l': app_load_labels(arg, false); break;
 
@@ -92,4 +94,7 @@ void args_parse(int argc, char* argv[]) {
             arguments.crt_values = val;
         }
     }
+    if (sargs_exists("fullscreen")) {
+        arguments.fullscreen = true;
+    }
 }

src/args.h

@@ -12,7 +12,7 @@ extern char program_version[];
 extern struct arguments {
     const char* rom;
     const char* output_file;
-    bool silent, verbose, zeromem, joy, dap, crt;
+    bool silent, verbose, zeromem, joy, dap, crt, fullscreen;
     const char* dap_port;
     const char* crt_values;
 } arguments;

src/ui/ui_x65.cc

@@ -77,6 +77,14 @@ static void _ui_x65_draw_menu(ui_x65_t* ui) {
                 }
                 ImGui::EndMenu();
             }
+#ifdef __EMSCRIPTEN__
+            const char* fullscreen_shortcut = "F11";
+#else
+            const char* fullscreen_shortcut = "Alt+Enter";
+#endif
+            if (ImGui::MenuItem(ICON_LC_FULLSCREEN " Fullscreen", fullscreen_shortcut, sapp_is_fullscreen())) {
+                sapp_toggle_fullscreen();
+            }
             ImGui::EndMenu();
         }
         if (ImGui::BeginMenu(ICON_LC_MICROCHIP " Hardware")) {

src/x65.c

@@ -388,6 +388,26 @@ void app_input(const sapp_event* event) {
     if (event->type == SAPP_EVENTTYPE_FILES_DROPPED) {
         fs_load_dropped_file_async(FS_CHANNEL_IMAGES);
     }
+    // Fullscreen toggle hotkey. Intercepted before the UI so it fires even
+    // when ImGui has keyboard focus. On desktop ALT+Enter toggles and is
+    // swallowed (Enter+Alt is not a meaningful X65 input). On web F11 toggles
+    // and still reaches the emulated machine after toggling.
+#ifdef __EMSCRIPTEN__
+    if (event->type == SAPP_EVENTTYPE_KEY_DOWN && event->key_code == SAPP_KEYCODE_F11) {
+        sapp_toggle_fullscreen();
+    }
+#else
+    if (event->type == SAPP_EVENTTYPE_KEY_DOWN || event->type == SAPP_EVENTTYPE_KEY_UP) {
+        const bool is_alt_enter = event->key_code == SAPP_KEYCODE_ENTER
+            && (event->modifiers & SAPP_MODIFIER_ALT);
+        if (is_alt_enter) {
+            if (event->type == SAPP_EVENTTYPE_KEY_DOWN) {
+                sapp_toggle_fullscreen();
+            }
+            return;
+        }
+    }
+#endif
 #ifdef CHIPS_USE_UI
     if (ui_input(event)) {
         // input was handled by UI
@@ -903,6 +923,7 @@ sapp_desc sokol_main(int argc, char* argv[]) {
         .cleanup_cb = app_cleanup,
         .width = window_width >= default_width ? window_width : default_width,
         .height = window_height >= default_height ? window_height : default_height,
+        .fullscreen = arguments.fullscreen,
         .window_title = app_name,
         .icon.images = {
             {