[mutter] Use eglGetPlatformDisplay

[Rui Matos <rtcm src gnome org>]

commit 1f0659d5169d19298e045fb98eeb28928869371d
Author: Adam Jackson <ajax redhat com>
Date:   Tue Oct 4 13:20:27 2016 -0400

    Use eglGetPlatformDisplay
    
    Different libEGL will do different things for eglGetDisplay since it has
    to guess what kind of display it's been handed. Better to just use the
    API that makes it explicit.
    
    Signed-off-by: Adam Jackson <ajax redhat com>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=772422

 cogl/cogl/winsys/cogl-winsys-egl-x11.c |   36 ++++++++++++++++++++++++++++++-
 1 files changed, 34 insertions(+), 2 deletions(-)
---
diff --git a/cogl/cogl/winsys/cogl-winsys-egl-x11.c b/cogl/cogl/winsys/cogl-winsys-egl-x11.c
index c660f34..d72ba02 100644
--- a/cogl/cogl/winsys/cogl-winsys-egl-x11.c
+++ b/cogl/cogl/winsys/cogl-winsys-egl-x11.c
@@ -262,6 +262,39 @@ _cogl_winsys_renderer_disconnect (CoglRenderer *renderer)
   g_slice_free (CoglRendererEGL, egl_renderer);
 }
 
+static EGLDisplay
+_cogl_winsys_egl_get_display (void *native)
+{
+  EGLDisplay dpy = NULL;
+  const char *client_exts = eglQueryString (NULL, EGL_EXTENSIONS);
+
+  if (g_strstr_len (client_exts, -1, "EGL_KHR_platform_base"))
+    {
+      PFNEGLGETPLATFORMDISPLAYEXTPROC get_platform_display =
+       (void *) eglGetProcAddress ("eglGetPlatformDisplay");
+
+      if (get_platform_display)
+       dpy = get_platform_display (EGL_PLATFORM_X11_KHR, native, NULL);
+
+      if (dpy)
+       return dpy;
+    }
+
+  if (g_strstr_len (client_exts, -1, "EGL_EXT_platform_base"))
+    {
+      PFNEGLGETPLATFORMDISPLAYEXTPROC get_platform_display =
+       (void *) eglGetProcAddress ("eglGetPlatformDisplayEXT");
+
+      if (get_platform_display)
+       dpy = get_platform_display (EGL_PLATFORM_X11_KHR, native, NULL);
+
+      if (dpy)
+       return dpy;
+    }
+
+  return eglGetDisplay ((EGLNativeDisplayType) native);
+}
+
 static CoglBool
 _cogl_winsys_renderer_connect (CoglRenderer *renderer,
                                CoglError **error)
@@ -278,8 +311,7 @@ _cogl_winsys_renderer_connect (CoglRenderer *renderer,
   if (!_cogl_xlib_renderer_connect (renderer, error))
     goto error;
 
-  egl_renderer->edpy =
-    eglGetDisplay ((EGLNativeDisplayType) xlib_renderer->xdpy);
+  egl_renderer->edpy = _cogl_winsys_egl_get_display (xlib_renderer->xdpy);
 
   if (!_cogl_winsys_egl_renderer_connect_common (renderer, error))
     goto error;