Add input_hotkey_enable.

Adds a mechanism to toggle when hotkeys are enabled.

config.def.h

@@ -390,6 +390,7 @@ static const struct retro_keybind retro_keybinds_1[] = {
    { true, RARCH_MUTE,                       RETROK_F9,     NO_BTN,      AXIS_NONE },
    { true, RARCH_NETPLAY_FLIP,               RETROK_i,      NO_BTN,      AXIS_NONE },
    { true, RARCH_SLOWMOTION,                 RETROK_e,      NO_BTN,      AXIS_NONE },
+   { true, RARCH_ENABLE_HOTKEY,              RETROK_UNKNOWN, NO_BTN,     AXIS_NONE },
 };
 
 // Player 2-5

driver.h

@@ -85,6 +85,7 @@ enum // RetroArch specific bind IDs.
    RARCH_MUTE,
    RARCH_NETPLAY_FLIP,
    RARCH_SLOWMOTION,
+   RARCH_ENABLE_HOTKEY,
 
 #ifdef RARCH_CONSOLE
    RARCH_CHEAT_INPUT,
@@ -235,6 +236,7 @@ typedef struct driver
    rarch_cmd_t *command;
 #endif
    bool stdin_claimed;
+   bool block_hotkey;
 
    // Opaque handles to currently running window.
    // Used by e.g. input drivers which bind to a window.
@@ -337,6 +339,9 @@ extern const input_driver_t input_null;
 
 static inline bool input_key_pressed_func(int key)
 {
+   if (driver.block_hotkey)
+      return false;
+
    bool ret = driver.input->key_pressed(driver.input_data, key);
 #ifdef HAVE_COMMAND
    if (!ret && driver.command)

retroarch.c

@@ -2417,8 +2417,23 @@ static void check_netplay_flip(void)
 }
 #endif
 
+static void check_block_hotkey(void)
+{
+   driver.block_hotkey = false;
+
+   // If we haven't bound anything to this, 
+   // always allow hotkeys.
+   static const struct retro_keybind *bind = &g_settings.input.binds[0][RARCH_ENABLE_HOTKEY];
+   if (bind->key == RETROK_UNKNOWN && bind->joykey == NO_BTN && bind->joyaxis == AXIS_NONE)
+      return;
+
+   driver.block_hotkey = !input_key_pressed_func(RARCH_ENABLE_HOTKEY);
+}
+
 static void do_state_checks(void)
 {
+   check_block_hotkey();
+
 #if defined(HAVE_SCREENSHOTS) && !defined(_XBOX)
    check_screenshot();
 #endif

retroarch.cfg

@@ -342,6 +342,16 @@
 # Hold for slowmotion.
 # input_slowmotion = e
 
+# Enable other hotkeys.
+# If this hotkey is bound to either keyboard, joybutton or joyaxis,
+# all other hotkeys will be disabled unless this hotkey is also held at the same time.
+# This is useful for RETRO_KEYBOARD centric implementations
+# which query a large area of the keyboard, where it is not desirable
+# that hotkeys get in the way.
+
+# Alternatively, all hotkeys for keyboard could be disabled by the user.
+# input_enable_hotkey =
+
 #### Misc
 
 # Enable rewinding. This will take a performance hit when playing, so it is disabled by default.

settings.c

@@ -669,6 +669,7 @@ static const struct bind_map bind_maps[MAX_PLAYERS][RARCH_BIND_LIST_END_NULL] =
       DECLARE_BIND(audio_mute,            RARCH_MUTE),
       DECLARE_BIND(netplay_flip_players,  RARCH_NETPLAY_FLIP),
       DECLARE_BIND(slowmotion,            RARCH_SLOWMOTION),
+      DECLARE_BIND(enable_hotkey,         RARCH_ENABLE_HOTKEY),
    },
 
    { DECL_PLAYER(2) },
@@ -686,8 +687,6 @@ struct key_map
    int key;
 };
 
-// Edit: Not portable to different input systems atm. Might move this map into the driver itself or something.
-// However, this should map nicely over to other systems aswell since the definition are mostly the same anyways.
 static const struct key_map sk_map[] = {
    { "left", RETROK_LEFT },
    { "right", RETROK_RIGHT },