mpsetups: introduced "menu alt" button/key to toggle presets

Currently the "menu alt" (L/R buttons, or Ctrl/Alt keys) is fixed, but
we may make it bindable later

port/include/input.h

@@ -40,6 +40,7 @@ enum virtkey {
 	VK_DELETE = 76,
 	VK_LCTRL = 224,
 	VK_LSHIFT = 225,
+	VK_LALT = 226,
 	VK_RCTRL = 228,
 	VK_RSHIFT = 229,
 
@@ -56,6 +57,8 @@ enum virtkey {
 	/* same order as SDL gamecontroller buttons plus two buttons for triggers */
 	VK_JOY_BEGIN,
 	VK_JOY1_BEGIN = VK_JOY_BEGIN,
+	VK_JOY1_LSHOULDER = VK_JOY1_BEGIN + 9,
+	VK_JOY1_RSHOULDER = VK_JOY1_BEGIN + 10,
 	VK_JOY1_LTRIG = VK_JOY1_BEGIN + 30,
 	VK_JOY1_RTRIG = VK_JOY1_BEGIN + 31,
 	VK_JOY2_BEGIN = VK_JOY1_BEGIN + INPUT_MAX_CONTROLLER_BUTTONS,
@@ -267,4 +270,8 @@ const char *inputGetClipboard(void);
 // returns keymod values
 u32 inputGetKeyModState(void);
 
+s32 inputMenuAlt1MenuPressed(s32 playerNum);
+s32 inputMenuAlt2MenuPressed(s32 playerNum);
+s32 inputMenuAltMenuPressed(s32 playerNum);
+
 #endif

port/src/input.c

@@ -1162,6 +1162,33 @@ s32 inputKeyJustPressed(u32 vk)
 	return result;
 }
 
+s32 inputMenuAlt1MenuPressed(s32 playerNum)
+{
+	s32 RSHOULDER = VK_JOY1_RSHOULDER + playerNum * INPUT_MAX_CONTROLLER_BUTTONS;
+
+	if (playerNum == 0) {
+		return inputKeyJustPressed(VK_LCTRL) || inputKeyJustPressed(RSHOULDER);
+	}
+
+	return inputKeyJustPressed(RSHOULDER);
+}
+
+s32 inputMenuAlt2MenuPressed(s32 playerNum)
+{
+	s32 LSHOULDER = VK_JOY1_LSHOULDER + playerNum * INPUT_MAX_CONTROLLER_BUTTONS;
+
+	if (playerNum == 0) {
+		return inputKeyJustPressed(VK_LALT) || inputKeyJustPressed(LSHOULDER);
+	}
+
+	return inputKeyJustPressed(LSHOULDER);
+}
+
+s32 inputMenuAltMenuPressed(s32 playerNum)
+{
+	return inputMenuAlt1MenuPressed(playerNum) || inputMenuAlt2MenuPressed(playerNum);
+}
+
 static inline u32 inputContToContKey(const u32 cont)
 {
 	if (cont == 0) {