From 687ec347d2fa0bca227e3a583a3a47f9bbc10bb0 Mon Sep 17 00:00:00 2001
From: Adam Jackson <ajax@redhat.com>
Date: Tue, 4 Oct 2016 13:15:39 -0400
Subject: [PATCH] check-accelerated-gles: Use eglGetPlatformDisplay{,EXT}

eglGetDisplay forces the implementation to guess, and in general it
can't guess correctly. Be explicit.

Signed-off-by: Adam Jackson <ajax@redhat.com>
---
 .../gnome-session-check-accelerated-gles-helper.c  | 36 +++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/tools/gnome-session-check-accelerated-gles-helper.c b/tools/gnome-session-check-accelerated-gles-helper.c
index 2a38d9e..472d1ad 100644
--- a/tools/gnome-session-check-accelerated-gles-helper.c
+++ b/tools/gnome-session-check-accelerated-gles-helper.c
@@ -34,11 +34,43 @@
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <EGL/egl.h>
+#include <EGL/eglext.h>
 #endif
 
 #include "gnome-session-check-accelerated-common.h"
 
 #ifdef GDK_WINDOWING_X11
+static EGLDisplay
+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 char *
 get_gles_renderer (void)
 {
@@ -67,7 +99,9 @@ get_gles_renderer (void)
         gdk_error_trap_push ();
 
         display = GDK_DISPLAY_XDISPLAY (gdk_display_get_default ());
-        egl_dpy = eglGetDisplay (display);
+
+        egl_dpy = get_display (display);
+
         if (!egl_dpy) {
                 g_warning ("eglGetDisplay() failed");
                 goto out;
-- 
2.9.3