EGL context

    EGLDisplay display;
    EGLConfig config;
    EGLContext context;
    EGLint num_config;
    EGLSurface surface;
    EGLNativeWindowType native_window;
    Display *x_display;

    // get an EGL display connection
    display = eglGetDisplay(EGL_DEFAULT_DISPLAY);

    // initialize the EGL display connection
    eglInitialize(display, NULL, NULL);
    eglBindAPI(EGL_OPENGL_ES_API);

    // get an appropriate EGL frame buffer configuration
    EGLint attribute_list[] = {
        EGL_RED_SIZE, 8,
        EGL_GREEN_SIZE, 8,
        EGL_BLUE_SIZE, 8,
        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
        EGL_NONE
    };
    eglChooseConfig(display, attribute_list, &config, 1, &num_config);
    if(num_config != 1)
    {
        LOGE("Number of suitable EGL configs found = %d.\n", num_config);
        exit(1);
    }

    // create an EGL rendering context
    EGLint ContextAttributes[] = {
        EGL_CONTEXT_CLIENT_VERSION, 2,      // selects OpenGL ES 2.0
        EGL_NONE
    };
    context = eglCreateContext(display, config, EGL_NO_CONTEXT, ContextAttributes);
    if(context == EGL_NO_CONTEXT)
    {
        LOGE("EGL Context creation failed\n");
        exit(1);
    }