From 70167b748d4c5dd7b0eabcafa6c31b688f52d698 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Gr=C3=A4=C3=9Flin?= <mgraesslin@kde.org>
Date: Fri, 15 Jul 2016 08:44:31 +0200
Subject: [PATCH] [platforms/x11] Add more warning on failure to create EGL
 context

Some error conditions did not have a warning, so all we got is
"Could not initialize rendering context". Which is not helpful to
figure out what is going wrong.
---
 plugins/platforms/x11/common/eglonxbackend.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/plugins/platforms/x11/common/eglonxbackend.cpp b/plugins/platforms/x11/common/eglonxbackend.cpp
index 323ba1b9fb..79b1f87ea4 100644
--- a/plugins/platforms/x11/common/eglonxbackend.cpp
+++ b/plugins/platforms/x11/common/eglonxbackend.cpp
@@ -179,8 +179,10 @@ bool EglOnXBackend::initRenderingContext()
     setHavePlatformBase(havePlatformBase);
     if (havePlatformBase) {
         // Make sure that the X11 platform is supported
-        if (!hasClientExtension(QByteArrayLiteral("EGL_EXT_platform_x11")))
+        if (!hasClientExtension(QByteArrayLiteral("EGL_EXT_platform_x11"))) {
+            qCWarning(KWIN_CORE) << "EGL_EXT_platform_base is supported, but EGL_EXT_platform_x11 is not. Cannot create EGLDisplay on X11";
             return false;
+        }
 
         const int attribs[] = {
             EGL_PLATFORM_X11_SCREEN_EXT, m_x11ScreenNumber,
@@ -192,8 +194,10 @@ bool EglOnXBackend::initRenderingContext()
         dpy = eglGetDisplay(m_x11Display);
     }
 
-    if (dpy == EGL_NO_DISPLAY)
+    if (dpy == EGL_NO_DISPLAY) {
+        qCWarning(KWIN_CORE) << "Failed to get the EGLDisplay";
         return false;
+    }
     setEglDisplay(dpy);
     initEglAPI();