Enabling experimental DLSYM support

Author: kika123

k_eglGetDisplayCopy.c

@@ -27,7 +27,13 @@ along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 */
-int x11_enabled;
+
+#ifdef X11EGLRPI_EXPERIMENTAL_DLSYM
+static int (*real_eglGetDisplay)(NativeDisplayType) = NULL;
+static EGLSurface (*real_eglCreateWindowSurface)(EGLDisplay egldisplay, EGLConfig config, NativeWindowType native_window, EGLint const * attrib_list) = NULL;
+static EGLBoolean (*real_eglSwapBuffers)(EGLDisplay edisplay, EGLSurface egsurface) = NULL;
+#endif
+static int x11_enabled = 0;
 Window* root;
 Window* window;
 EGLDisplay *edisplay;
@@ -36,6 +42,11 @@ Display* display;
 EGLSurface egl_surface;
 XWindowAttributes *window_attributes_return;
 EGLDisplay eglGetDisplay(NativeDisplayType native_display) {
+#ifdef X11EGLRPI_EXPERIMENTAL_DLSYM
+	real_eglGetDisplay = dlsym(RTLD_NEXT, "eglGetDisplay");
+	real_eglCreateWindowSurface = dlsym(RTLD_NEXT,"eglCreateWindowSurface");
+	real_eglSwapBuffers= dlsym(RTLD_NEXT,"eglSwapBuffers");
+#endif
 	if ( native_display == EGL_DEFAULT_DISPLAY) {
 		x11_enabled=0;
 		return real_eglGetDisplay(native_display);