From 1f0659d5169d19298e045fb98eeb28928869371d Mon Sep 17 00:00:00 2001
From: Adam Jackson <ajax@redhat.com>
Date: Tue, 4 Oct 2016 13:20:27 -0400
Subject: [PATCH] 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 file 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 c660f3428..d72ba02f4 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;