libretro, improve 32x save/load for run-ahead

irixxxx · Jan 3, 2022 · 92f7a43 · 92f7a43
1 parent b72662e
commit 92f7a43
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Showing 2 changed files with 8 additions and 0 deletions.
diff --git a/pico/state.c b/pico/state.c
@@ -347,6 +347,7 @@ static int state_save(void *file)
       CHECKED_WRITE(chwc->chunk, chwc->size, chwc->ptr);
   }
 
+  CHECKED_WRITE(0, 0, NULL);
   retval = 0;
 
 out:
@@ -540,6 +541,8 @@ static int state_load(void *file)
         break;
 #endif
       default:
+        if (len|chunk == 0)
+           goto readend;
         if (carthw_chunks != NULL)
         {
           carthw_state_chunk *chwc;

diff --git a/platform/libretro/libretro.c b/platform/libretro/libretro.c
@@ -872,9 +872,14 @@ int state_fseek(void *file, long offset, int whence)
 size_t retro_serialize_size(void)
 {
    struct savestate_state state = { 0, };
+   unsigned AHW = PicoIn.AHW;
    int ret;
 
+   /* we need the max possible size here, so include 32X for MD and MCD */
+   if (!(AHW & (PAHW_SMS|PAHW_PICO|PAHW_SVP)))
+      PicoIn.AHW |= PAHW_32X;
    ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
+   PicoIn.AHW = AHW;
    if (ret != 0)
       return 0;