Add support for wide strings (wchar_t) to the engine.

research/miniaudio_engine.h

@@ -1678,6 +1678,7 @@ MA_API ma_result ma_engine_play_sound(ma_engine* pEngine, const char* pFilePath,
 
 #ifndef MA_NO_RESOURCE_MANAGER
 MA_API ma_result ma_sound_init_from_file(ma_engine* pEngine, const char* pFilePath, ma_uint32 flags, ma_async_notification* pNotification, ma_sound_group* pGroup, ma_sound* pSound);
+MA_API ma_result ma_sound_init_from_file_w(ma_engine* pEngine, const wchar_t* pFilePath, ma_uint32 flags, ma_async_notification* pNotification, ma_sound_group* pGroup, ma_sound* pSound);
 #endif
 MA_API ma_result ma_sound_init_from_data_source(ma_engine* pEngine, ma_data_source* pDataSource, ma_uint32 flags, ma_sound_group* pGroup, ma_sound* pSound);
 MA_API void ma_sound_uninit(ma_sound* pSound);
@@ -9582,7 +9583,7 @@ static ma_result ma_sound_init_from_data_source_internal(ma_engine* pEngine, ma_
 }
 
 #ifndef MA_NO_RESOURCE_MANAGER
-MA_API ma_result ma_sound_init_from_file(ma_engine* pEngine, const char* pFilePath, ma_uint32 flags, ma_async_notification* pNotification, ma_sound_group* pGroup, ma_sound* pSound)
+MA_API ma_result ma_sound_init_from_file_internal(ma_engine* pEngine, const char* pFilePath, const wchar_t* pFilePathW, ma_uint32 flags, ma_async_notification* pNotification, ma_sound_group* pGroup, ma_sound* pSound)
 {
     ma_result result;
 
@@ -9601,7 +9602,14 @@ MA_API ma_result ma_sound_init_from_file(ma_engine* pEngine, const char* pFilePa
     will get triggered before this function returns. This is OK, so long as the caller is aware of
     it and can avoid accessing the sound from within the notification.
     */
-    result = ma_resource_manager_data_source_init(pEngine->pResourceManager, pFilePath, flags | MA_DATA_SOURCE_FLAG_WAIT_INIT, pNotification, &pSound->resourceManagerDataSource);
+    flags |= MA_DATA_SOURCE_FLAG_WAIT_INIT;
+
+    if (pFilePath != NULL) {
+        result = ma_resource_manager_data_source_init(pEngine->pResourceManager, pFilePath, flags, pNotification, &pSound->resourceManagerDataSource);
+    } else {
+        result = ma_resource_manager_data_source_init_w(pEngine->pResourceManager, pFilePathW, flags, pNotification, &pSound->resourceManagerDataSource);
+    }
+    
     if (result != MA_SUCCESS) {
         return result;
     }
@@ -9617,6 +9625,16 @@ MA_API ma_result ma_sound_init_from_file(ma_engine* pEngine, const char* pFilePa
 
     return MA_SUCCESS;
 }
+
+MA_API ma_result ma_sound_init_from_file(ma_engine* pEngine, const char* pFilePath, ma_uint32 flags, ma_async_notification* pNotification, ma_sound_group* pGroup, ma_sound* pSound)
+{
+    return ma_sound_init_from_file_internal(pEngine, pFilePath, NULL, flags, pNotification, pGroup, pSound);
+}
+
+MA_API ma_result ma_sound_init_from_file_w(ma_engine* pEngine, const wchar_t* pFilePath, ma_uint32 flags, ma_async_notification* pNotification, ma_sound_group* pGroup, ma_sound* pSound)
+{
+    return ma_sound_init_from_file_internal(pEngine, NULL, pFilePath, flags, pNotification, pGroup, pSound);
+}
 #endif
 
 MA_API ma_result ma_sound_init_from_data_source(ma_engine* pEngine, ma_data_source* pDataSource, ma_uint32 flags, ma_sound_group* pGroup, ma_sound* pSound)