Full savestating to memory

include/gamepad.h

@@ -13,6 +13,20 @@ typedef struct {
     bool right;
 } gamepad_state;
 
+typedef struct {
+    bool button_sel;
+    bool dir_sel;
+    gamepad_state controller;
+    gamepad_state prev;
+} gamepad_context;
+
+typedef struct {
+    gamepad_context ctx;
+} ctlr_state;
+
+void gamepad_save_state(ctlr_state*);
+void gamepad_load_state(const ctlr_state*);
+
 void gamepad_init();
 bool gamepad_button_sel();
 bool gamepad_dir_sel();