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diff --git a/platform/libretro/libretro.cpp b/platform/libretro/libretro.cpp
index 927ea8d4b8d1658a1d7521fe7e9abcbdede0ba5f..63a43f3f065344cdf45e0b10e5c9c089736695f2 100644
--- a/platform/libretro/libretro.cpp
+++ b/platform/libretro/libretro.cpp
@@ -82,6 +82,46 @@ EXPORT void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_
EXPORT void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
EXPORT void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
+
+static int frames = 0;
+static int defer_frames = 2;
+static void* deferred_data = NULL;
+static size_t deferred_size = 0;
+
+static void free_deferred_data(void) {
+ if (deferred_size) {
+ if (log_cb) log_cb(RETRO_LOG_INFO, "Freed deferred save state.\n");
+ free(deferred_data);
+ deferred_data = NULL;
+ deferred_size = 0;
+ }
+}
+
+static void defer_unserialize(const void *data, size_t size) {
+ free_deferred_data();
+
+ if (data==NULL || size<=0) return;
+
+ if (log_cb) log_cb(RETRO_LOG_INFO, "Deferred save state load.\n");
+
+ deferred_data = malloc(size);
+ memcpy(deferred_data, data, size);
+ deferred_size = size;
+}
+static void update_deferred(void) {
+ frames += 1;
+
+ if (frames<defer_frames) return;
+
+ if (deferred_size==0) return;
+
+ retro_unserialize(deferred_data, deferred_size);
+
+ if (log_cb) log_cb(RETRO_LOG_INFO, "Loaded deferred save state.\n");
+
+ free_deferred_data();
+}
+
EXPORT void retro_init()
{
retro_log_callback log;
@@ -132,6 +172,8 @@ EXPORT void retro_deinit()
if (log_cb) {
log_cb(RETRO_LOG_INFO, "Retro deinit called. tearing down\n");
}
+ free_deferred_data();
+
//delete things created in init
_vm->CloseCart();
_host->oneTimeCleanup();
@@ -205,6 +247,8 @@ int flip = 0;
EXPORT void retro_run()
{
+ if (frames<defer_frames) update_deferred();
+
//TODO: improve this so slower hardware can play 30fps games at full speed
if (_vm->getTargetFps() == 60 || frame % 2 == 0)
{
@@ -396,6 +440,11 @@ EXPORT bool retro_serialize(void *data, size_t size)
EXPORT bool retro_unserialize(const void *data, size_t size)
{
+ if (frames<defer_frames) {
+ defer_unserialize(data,size);
+ return true;
+ }
+
if (log_cb) {
log_cb(RETRO_LOG_INFO, "lua deserialize\n");
}
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