egl.cpp

	EGLNativeWindowType window = ...; //OS Window handle
  eglBindAPI(EGL_OPENGL_API);
	const EGLint attribs[] = {

		EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
		EGL_DEPTH_SIZE,   8,
		EGL_BLUE_SIZE,    8,
		EGL_GREEN_SIZE,   8,
		EGL_RED_SIZE,     8,
		EGL_NONE };
	EGLint format;
	EGLint numConfigs;
	EGLConfig config;
	EGLSurface surface;
	EGLContext context;

	EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);

	eglInitialize(display, 0, 0);

	/* Here, the application chooses the configuration it desires. In this
	* sample, we have a very simplified selection process, where we pick
	* the first EGLConfig that matches our criteria */
	eglChooseConfig(display, attribs, &config, 1, &numConfigs);

	/* EGL_NATIVE_VISUAL_ID is an attribute of the EGLConfig that is
	* guaranteed to be accepted by ANativeWindow_setBuffersGeometry().
	* As soon as we picked a EGLConfig, we can safely reconfigure the
	* ANativeWindow buffers to match, using EGL_NATIVE_VISUAL_ID. */
	eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &format);

	surface = eglCreateWindowSurface(display, config, window, NULL);

	const EGLint contextAttr[] = {
		EGL_CONTEXT_CLIENT_VERSION, 3,
    EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT,
		EGL_CONTEXT_FLAGS_KHR, EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR,
		EGL_NONE
	};

	context = eglCreateContext(display, config, EGL_NO_CONTEXT, contextAttr);

	if (eglMakeCurrent(display, surface, surface, context) == EGL_FALSE) {
		LOGW("Unable to eglMakeCurrent");
		return -1;
	}