Day 25 done.

sdl_handmade.h

@@ -33,9 +33,16 @@ typedef struct sdl_sound_output {
 /* NOTE: We choose 1024 only because MacOS's MAXPATHLEN says such a value.
  *       For example, linux/limits.h PATH_MAX says 4096. */
 #define SDL_STATE_PATH_SIZE 1024
+
+typedef struct sdl_replay_buffer {
+    char ReplayFilename[SDL_STATE_PATH_SIZE];
+    void *MemoryBlock;
+} sdl_replay_buffer;
+
 typedef struct sdl_state {
     U64 TotalSize;
     void *GameMmemoryBlock;
+    sdl_replay_buffer ReplayBuffers[4];
 
     S32 RecordingHandle;
     S32 InputRecordingIndex;