gx2: add GX2GetMainCoreId

include/gx2/state.h

@@ -1,4 +1,5 @@
 #pragma once
+
 #include <wut.h>
 #include "enum.h"
 
@@ -24,6 +25,12 @@ GX2Flush();
 void
 GX2ResetGPU(uint32_t unknown);
 
+/**
+ * @return -1 if GX2 is not running, on success the core where GX2Init has been called is returned.
+ */
+int
+GX2GetMainCoreId();
+
 #ifdef __cplusplus
 }
 #endif