1 files changed, 42 insertions, 15 deletions

diff --git a/src/plugins/platforms/windows/qwindowseglcontext.cpp b/src/plugins/platforms/windows/qwindowseglcontext.cpp
index f52c5b733c..7db6abd8ef 100644
--- a/src/plugins/platforms/windows/qwindowseglcontext.cpp
+++ b/src/plugins/platforms/windows/qwindowseglcontext.cpp
@@ -1,7 +1,7 @@
 /****************************************************************************
 **
-** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
-** Contact: http://www.qt-project.org/legal
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
 **
 ** This file is part of the plugins of the Qt Toolkit.
 **
@@ -10,9 +10,9 @@
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and Digia. For licensing terms and
-** conditions see http://qt.digia.com/licensing. For further information
-** use the contact form at http://qt.digia.com/contact-us.
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
 **
 ** GNU Lesser General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU Lesser
@@ -23,8 +23,8 @@
 ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
-** In addition, as a special exception, Digia gives you certain additional
-** rights. These rights are described in the Digia Qt LGPL Exception
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ** $QT_END_LICENSE$
@@ -416,12 +416,15 @@ QWindowsOpenGLContext *QWindowsEGLStaticContext::createContext(QOpenGLContext *c
     return new QWindowsEGLContext(this, context->format(), context->shareHandle());
 }
 
-void *QWindowsEGLStaticContext::createWindowSurface(void *nativeWindow, void *nativeConfig)
+void *QWindowsEGLStaticContext::createWindowSurface(void *nativeWindow, void *nativeConfig, int *err)
 {
+    *err = 0;
     EGLSurface surface = libEGL.eglCreateWindowSurface(m_display, (EGLConfig) nativeConfig,
                                                        (EGLNativeWindowType) nativeWindow, 0);
-    if (surface == EGL_NO_SURFACE)
-        qWarning("%s: Could not create the EGL window surface: 0x%x\n", Q_FUNC_INFO, libEGL.eglGetError());
+    if (surface == EGL_NO_SURFACE) {
+        *err = libEGL.eglGetError();
+        qWarning("%s: Could not create the EGL window surface: 0x%x\n", Q_FUNC_INFO, *err);
+    }
 
     return surface;
 }
@@ -578,8 +581,15 @@ bool QWindowsEGLContext::makeCurrent(QPlatformSurface *surface)
 
     QWindowsWindow *window = static_cast<QWindowsWindow *>(surface);
     window->aboutToMakeCurrent();
-    EGLSurface eglSurface = static_cast<EGLSurface>(window->surface(m_eglConfig));
-    Q_ASSERT(eglSurface);
+    int err = 0;
+    EGLSurface eglSurface = static_cast<EGLSurface>(window->surface(m_eglConfig, &err));
+    if (eglSurface == EGL_NO_SURFACE) {
+        if (err == EGL_CONTEXT_LOST) {
+            m_eglContext = EGL_NO_CONTEXT;
+            qCDebug(lcQpaGl) << "Got EGL context lost in createWindowSurface() for context" << this;
+        }
+        return false;
+    }
 
     // shortcut: on some GPUs, eglMakeCurrent is not a cheap operation
     if (QWindowsEGLStaticContext::libEGL.eglGetCurrentContext() == m_eglContext &&
@@ -597,7 +607,17 @@ bool QWindowsEGLContext::makeCurrent(QPlatformSurface *surface)
             QWindowsEGLStaticContext::libEGL.eglSwapInterval(m_staticContext->display(), m_swapInterval);
         }
     } else {
-        qWarning("QWindowsEGLContext::makeCurrent: eglError: %x, this: %p \n", QWindowsEGLStaticContext::libEGL.eglGetError(), this);
+        err = QWindowsEGLStaticContext::libEGL.eglGetError();
+        // EGL_CONTEXT_LOST (loss of the D3D device) is not necessarily fatal.
+        // Qt Quick is able to recover for example.
+        if (err == EGL_CONTEXT_LOST) {
+            m_eglContext = EGL_NO_CONTEXT;
+            qCDebug(lcQpaGl) << "Got EGL context lost in makeCurrent() for context" << this;
+            // Drop the surface. Will recreate on the next makeCurrent.
+            window->invalidateSurface();
+        } else {
+            qWarning("QWindowsEGLContext::makeCurrent: eglError: %x, this: %p \n", err, this);
+        }
     }
 
     return ok;
@@ -615,8 +635,15 @@ void QWindowsEGLContext::swapBuffers(QPlatformSurface *surface)
 {
     QWindowsEGLStaticContext::libEGL.eglBindAPI(m_api);
     QWindowsWindow *window = static_cast<QWindowsWindow *>(surface);
-    EGLSurface eglSurface = static_cast<EGLSurface>(window->surface(m_eglConfig));
-    Q_ASSERT(eglSurface);
+    int err = 0;
+    EGLSurface eglSurface = static_cast<EGLSurface>(window->surface(m_eglConfig, &err));
+    if (eglSurface == EGL_NO_SURFACE) {
+        if (err == EGL_CONTEXT_LOST) {
+            m_eglContext = EGL_NO_CONTEXT;
+            qCDebug(lcQpaGl) << "Got EGL context lost in createWindowSurface() for context" << this;
+        }
+        return;
+    }
 
     bool ok = QWindowsEGLStaticContext::libEGL.eglSwapBuffers(m_eglDisplay, eglSurface);
     if (!ok)