From 998aa532d0cc7373ac8b118c1fc6f88dc40e2416 Mon Sep 17 00:00:00 2001
From: Adam Jackson <ajax@redhat.com>
Date: Tue, 4 Oct 2016 13:20:27 -0400
Subject: 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 ++++++++++++++++++++++++++++--
 src/backends/native/meta-renderer-native.c | 36 ++++++++++++++++++++++++++++--
 2 files changed, 68 insertions(+), 4 deletions(-)

diff --git a/cogl/cogl/winsys/cogl-winsys-egl-x11.c b/cogl/cogl/winsys/cogl-winsys-egl-x11.c
index 454b41ebc..a7379a550 100644
--- a/cogl/cogl/winsys/cogl-winsys-egl-x11.c
+++ b/cogl/cogl/winsys/cogl-winsys-egl-x11.c
@@ -261,6 +261,39 @@ _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)
@@ -277,8 +310,7 @@ _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;
diff --git a/src/backends/native/meta-renderer-native.c b/src/backends/native/meta-renderer-native.c
index 6d891535c..103e6ad8e 100644
--- a/src/backends/native/meta-renderer-native.c
+++ b/src/backends/native/meta-renderer-native.c
@@ -231,6 +231,39 @@ meta_onscreen_native_queue_swap_notify (CoglOnscreen *onscreen)
   onscreen_native->pending_swap_notify = TRUE;
 }
 
+static EGLDisplay
+meta_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_GBM_MESA, 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_GBM_MESA, native, NULL);
+
+      if (dpy)
+	return dpy;
+    }
+
+  return eglGetDisplay ((EGLNativeDisplayType) native);
+}
+
 static CoglBool
 meta_renderer_native_connect (CoglRenderer *cogl_renderer,
                               CoglError   **error)
@@ -255,8 +288,7 @@ meta_renderer_native_connect (CoglRenderer *cogl_renderer,
       goto fail;
     }
 
-  egl_renderer->edpy =
-    eglGetDisplay ((EGLNativeDisplayType) renderer_native->gbm);
+  egl_renderer->edpy = meta_egl_get_display (renderer_native->gbm);
   if (egl_renderer->edpy == EGL_NO_DISPLAY)
     {
       _cogl_set_error (error, COGL_WINSYS_ERROR,
-- 
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