Don't init assets from init.

Rename to context_reset/context_destroy and let the driver init/uninit
step signal the menu when the context is going down and coming up.

driver.c

@@ -508,9 +508,10 @@ bool driver_update_system_av_info(const struct retro_system_av_info *info)
 #ifdef HAVE_MENU
 static void init_menu(void)
 {
-   if (!driver.menu_ctx)
-      find_menu_driver();
+   if (driver.menu)
+      return;
 
+   find_menu_driver();
    if (!(driver.menu = (rgui_handle_t*)menu_init(driver.menu_ctx)))
    {
       RARCH_ERR("Cannot initialize menu.\n");
@@ -547,6 +548,9 @@ void init_drivers(void)
       g_extern.system.hw_render_callback.context_reset();
    driver.video_cache_context_ack = false;
 
+   if (driver.menu_ctx && driver.menu_ctx->context_reset)
+      driver.menu_ctx->context_reset(driver.menu);
+
    init_audio();
 
 #ifdef HAVE_CAMERA
@@ -631,9 +635,15 @@ void uninit_drivers(void)
    if (g_extern.system.hw_render_callback.context_destroy && !driver.video_cache_context)
       g_extern.system.hw_render_callback.context_destroy();
 
+   if (driver.menu_ctx && driver.menu_ctx->context_destroy)
+      driver.menu_ctx->context_destroy(driver.menu);
+
 #ifdef HAVE_MENU
    if (!driver.menu_data_own)
+   {
       menu_free(driver.menu);
+      driver.menu = NULL;
+   }
 #endif
 
    uninit_video_input();

driver.h

@@ -418,8 +418,8 @@ typedef struct menu_ctx_driver
    void  (*frame)(void);
    void* (*init)(void);
    void  (*free)(void*);
-   void  (*init_assets)(void*);
-   void  (*free_assets)(void*);
+   void  (*context_reset)(void*);
+   void  (*context_destroy)(void*);
    void  (*populate_entries)(void*, unsigned);
    void  (*iterate)(void*, unsigned);
    int   (*input_postprocess)(uint64_t);

frontend/menu/disp/lakka.c

@@ -1019,7 +1019,7 @@ static GLuint png_texture_load(const char * file_name, int * width, int * height
     return texture;
 }
 
-static void lakka_free_assets(void *data)
+static void lakka_context_destroy(void *data)
 {
    (void)data;
 
@@ -1036,7 +1036,7 @@ static void lakka_free_assets(void *data)
       free(tweens);
 }
 
-static void lakka_init_assets(void *data)
+static void lakka_context_reset(void *data)
 {
    char path[256], dirpath[256];;
    rgui_handle_t *rgui = (rgui_handle_t*)data;
@@ -1190,13 +1190,10 @@ static void lakka_init_items(int i, menu_category_t *category, core_info_t *info
 }
 
 
-
 static void lakka_free(void *data)
 {
    rgui_handle_t *rgui = (rgui_handle_t*)data;
 
-   lakka_free_assets(rgui);
-
    if (rgui->alloc_font)
       free((uint8_t*)rgui->font);
 }
@@ -1246,7 +1243,6 @@ static void *lakka_init(void)
    init_font(gl, g_settings.video.font_path, g_settings.video.font_size, gl->win_width, gl->win_height);
 
    lakka_init_core_info(rgui);
-   lakka_init_assets(rgui);
 
    if (categories)
    {
@@ -1358,8 +1354,8 @@ const menu_ctx_driver_t menu_ctx_lakka = {
    lakka_frame,
    lakka_init,
    lakka_free,
-   lakka_init_assets,
-   lakka_free_assets,
+   lakka_context_reset,
+   lakka_context_destroy,
    NULL,
    NULL,
    lakka_input_postprocess,

frontend/menu/disp/rmenu.c

@@ -450,7 +450,7 @@ void rmenu_set_texture(void *data, bool enable)
    }
 }
 
-static void rmenu_init_assets(void *data)
+static void rmenu_context_reset(void *data)
 {
    rgui_handle_t *rgui = (rgui_handle_t*)data;
 
@@ -476,19 +476,16 @@ static void *rmenu_init(void)
    if (!rgui)
       return NULL;
 
-   rmenu_init_assets(rgui);
-
    return rgui;
 }
 
-static void rmenu_free_assets(void *data)
+static void rmenu_context_destroy(void *data)
 {
    texture_image_free(driver.video_data, menu_texture);
 }
 
 static void rmenu_free(void *data)
 {
-   rmenu_free_assets(data);
 }
 
 static int rmenu_input_postprocess(uint64_t old_state)
@@ -524,8 +521,8 @@ const menu_ctx_driver_t menu_ctx_rmenu = {
    NULL,
    rmenu_init,
    rmenu_free,
-   rmenu_init_assets,
-   rmenu_free_assets,
+   rmenu_context_reset,
+   rmenu_context_destroy,
    NULL,
    NULL,
    rmenu_input_postprocess,

retroarch.c

@@ -1963,6 +1963,10 @@ static void check_savestates(bool immutable)
 
 void rarch_set_fullscreen(bool fullscreen)
 {
+#ifdef HAVE_MENU
+   driver.menu_data_own = true; // Don't reinit menu for something trivial.
+#endif
+
    g_settings.video.fullscreen = fullscreen;
    driver.video_cache_context = g_extern.system.hw_render_callback.cache_context;
    driver.video_cache_context_ack = false;
@@ -1973,6 +1977,10 @@ void rarch_set_fullscreen(bool fullscreen)
    // Poll input to avoid possibly stale data to corrupt things.
    if (driver.input)
       input_poll_func();
+
+#ifdef HAVE_MENU
+   driver.menu_data_own = false;
+#endif
 }
 
 bool rarch_check_fullscreen(void)