Could not get native display: How is platformGetNativeDisplay() in AcceleratedScreen realized?

[info at cuhka.com]

Have found some further code in MX6AcceleratedScreen.c.

//Vivante specials
static EGLNativeDisplayType (*wr_fbGetDisplayByIndex)(int DisplayIndex);
static EGLNativeWindowType (*wr_fbCreateWindow)(EGLNativeDisplayType  
Display, int X, int Y, int Width, int Height);

JNIEXPORT jlong JNICALL  
Java_com_sun_glass_ui_monocle_MX6AcceleratedScreen__1platformGetNativeDisplay
     (JNIEnv *env, jobject obj, jlong methodHandle) {
     EGLNativeDisplayType cachedDisplay = NULL;

     if (cachedDisplay == NULL) {
         wr_fbGetDisplayByIndex = asPtr(methodHandle);
         cachedDisplay = wr_fbGetDisplayByIndex(0);
     }
     return asJLong(cachedDisplay);
}

Now to find out why this fails. Maybe fbGetDisplayByIndex should use  
another value?

Maurice.