OpenGL ES 2 on Android: native window

Question

According to OGLES specification, we have the following definition:

EGLSurface eglCreateWindowSurface(EGLDisplay display,
                                  EGLConfig config,
                                  NativeWindowType native_window,
                                  EGLint const * attrib_list)

More details, here: http://www.khronos.org/opengles/documentation/opengles1_0/html/eglCreateWindowSurface.html

And also by definition:

int32_t ANativeWindow_setBuffersGeometry(ANativeWindow* window, int32_t width, 
                                         int32_t height, int32_t format);

More details, here: http://mobilepearls.com/labs/native-android-api

I am running Android Native App on OGLES 2 and debugging it in a Samsung Nexus device. For setting up the 3D scene graph environment, the following variables are defined:

struct android_app {
    ...
    ANativeWindow* window;
};
android_app* mApplication;
...
mApplication=&pApplication;

And to initialize the App, we run the commands in the code:

ANativeWindow_setBuffersGeometry(mApplication->window, 0, 0, lFormat);
mSurface = eglCreateWindowSurface(mDisplay, lConfig, 
                                  mApplication->window, NULL);

Funny to say is that, the command ANativeWindow_setBuffersGeometry behaves as expected and works fine according to its definition, accepting all the parameters sent to it. But the eglCreateWindowSurface does no accept the parameter mApplication->window, as it should accept according to its definition. Instead, it looks for the following input:

EGLNativeWindowType hWnd;
mSurface = eglCreateWindowSurface(mDisplay,lConfig,hWnd,NULL);

As an alternative, I considered to use instead:

NativeWindowType hWnd=android_createDisplaySurface();

But debugger says:

Function 'android_createDisplaySurface' could not be resolved

Is 'android_createDisplaySurface' compatible only for OGLES 1 and not for OGLES 2?

Can someone tell if there is a way to convert mApplication->window? In a way that the data from the android_app get accepted to the window surface?

Answer 1

Are you sure you are using egl.h header from Android NDK? In Android NDK EGLNativeWindowType is defined in eglplatform.h file (it is included from egl.h):

#elif defined(__ANDROID__) || defined(ANDROID)
#include <android/native_window.h>
...
typedef struct ANativeWindow*           EGLNativeWindowType;

As you can see EGLNativeWindowType has correct type - ANativeWindow*