GBA: Added save state support

Author: ducalex

gbsp/components/gbsp-libretro/common.h

@@ -157,8 +157,9 @@ typedef u32 fixed8_24;
 #define read_dmareg(regnum, dmachan) (eswap16(io_registers[(regnum) + (dmachan) * 6]))
 #define write_dmareg(regnum, dmachan, val) io_registers[(regnum) + (dmachan) * 6] = eswap16(val)
 
+#ifdef RETRO_GO
 #include <rg_system.h>
-#include <esp_attr.h>
+#endif
 #include <unistd.h>
 #include <time.h>
 #include <stdlib.h>

gbsp/main/main.c

@@ -44,12 +44,26 @@ static bool screenshot_handler(const char *filename, int width, int height)
 
 static bool save_state_handler(const char *filename)
 {
-    return false;
+    size_t buffer_len = GBA_STATE_MEM_SIZE;
+    void *buffer = malloc(buffer_len);
+    if (!buffer)
+        return false;
+    gba_save_state(buffer);
+    bool success = rg_storage_write_file(filename, buffer, buffer_len, 0);
+    free(buffer);
+    return success;
 }
 
 static bool load_state_handler(const char *filename)
 {
-    return false;
+    size_t buffer_len = GBA_STATE_MEM_SIZE;
+    void *buffer = malloc(buffer_len);
+    if (!buffer)
+        return false;
+    bool success = rg_storage_read_file(filename, &buffer, &buffer_len, RG_FILE_USER_BUFFER)
+                    && gba_load_state(buffer);
+    free(buffer);
+    return success;
 }
 
 static bool reset_handler(bool hard)
@@ -150,6 +164,12 @@ void app_main(void)
     RG_LOGI("reset_gba");
     reset_gba();
 
+    if (app->bootFlags & RG_BOOT_RESUME)
+    {
+        RG_LOGI("load_state");
+        rg_emu_load_state(app->saveSlot);
+    }
+
     RG_LOGI("emulation loop");
 
     rg_audio_sample_t mixbuffer[AUDIO_BUFFER_LENGTH] = {0};