gistfile1.diff

--- a/libretro-v2.h
+++ b/libretro-v2.h
@@ -1890,18 +1890,32 @@ void retro_reset(struct retro_core_data *core_handle);
  */
 void retro_run(struct retro_core_data *core_handle);

+enum retro_serialize_type {
+   RETRO_SERIALIZE_TYPE_SRAM = 0, /* This refers to save data. */
+   RETRO_SERIALIZE_TYPE_SAVESTATE, /* This refers to all internal core state. */
+
+   RETRO_SERIALIZE_TYPE_DUMMY = INT_MAX
+};
 /* Returns the amount of data the implementation requires to serialize
- * internal state (save states).
+ * the given data type.
  * Between calls to retro_load_game() and retro_unload_game(), the
- * returned size is never allowed to be larger than a previous returned
+ * returned size for a certain type is never allowed to be larger than a previous returned
  * value, to ensure that the frontend can allocate a save state buffer once.
  */
-size_t retro_serialize_size(struct retro_core_data *core_handle);
+size_t retro_serialize_size(enum retro_serialize_type type, bool *can_detect_changes, struct retro_core_data *core_handle);

 /* Serializes internal state. If failed, or size is lower than
- * retro_serialize_size(), it should return false, true otherwise. */
-bool retro_serialize(void *data, size_t size, struct retro_core_data *core_handle);
-bool retro_unserialize(const void *data, size_t size, struct retro_core_data *core_handle);
+ * retro_serialize_size(), it should return false, true otherwise.
+ * If the core can detect when its SRAM is changed, the front will call this with data==NULL, and the core will return success if the data is unchanged.
+ * A core is allowed, but not required, to accept serialization data with different size than what retro_serialize_size returns, both bigger and smaller, if the size changes between versions of the core and the core wants to be able to load old data. */
+bool retro_serialize(enum retro_serialize_type type, void *data, size_t size, struct retro_core_data *core_handle);
+bool retro_unserialize(enum retro_serialize_type type, const void *data, size_t size, struct retro_core_data *core_handle);

 /* Loads a game. The returned value is a valid