From 7616da319f0c64bf18900fe17ee3c6dd60496174 Mon Sep 17 00:00:00 2001
From: Jani Hautakangas <jani.hautakangas@nokia.com>
Date: Thu, 21 Apr 2011 14:07:09 +0300
Subject: Fix for GL graphcics system orientation which
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OpenGL context needs to be recreated on Symbian
when orientation changes. Previously only the EGL
surface was recreated which wasn't enough.

Task-number: QTBUG-18850
Reviewed-by: Samuel Rødal
---
 src/opengl/qwindowsurface_gl.cpp | 48 ++++++++++++++--------------------------
 1 file changed, 16 insertions(+), 32 deletions(-)

diff --git a/src/opengl/qwindowsurface_gl.cpp b/src/opengl/qwindowsurface_gl.cpp
index ed541ce..b056caa 100644
--- a/src/opengl/qwindowsurface_gl.cpp
+++ b/src/opengl/qwindowsurface_gl.cpp
@@ -706,7 +706,6 @@ void QGLWindowSurface::flush(QWidget *widget, const QRegion &rgn, const QPoint &
         } else {
             glFlush();
         }
-
         return;
     }
 
@@ -856,8 +855,22 @@ void QGLWindowSurface::updateGeometry() {
 
     bool hijack(true);
     QWidgetPrivate *wd = window()->d_func();
-    if (wd->extraData() && wd->extraData()->glContext)
-        hijack = false; // we already have gl context for widget
+    if (wd->extraData() && wd->extraData()->glContext) {
+#ifdef Q_OS_SYMBIAN // Symbian needs to recreate the context when native window size changes
+        if (d_ptr->size != geometry().size()) {
+            if (window() != qt_gl_share_widget())
+                --(_qt_gl_share_widget()->widgetRefCount);
+
+            delete wd->extraData()->glContext;
+            wd->extraData()->glContext = 0;
+            d_ptr->ctx = 0;
+        }
+        else
+#endif
+        {
+            hijack = false; // we already have gl context for widget
+        }
+    }
 
     if (hijack)
         hijackWindow(window());
@@ -878,35 +891,6 @@ void QGLWindowSurface::updateGeometry() {
 
     d_ptr->size = surfSize;
 
-#ifdef Q_OS_SYMBIAN
-    if (!hijack) { // Symbian needs to recreate EGL surface when native window size changes
-        if (ctx->d_func()->eglSurface != EGL_NO_SURFACE) {
-            eglDestroySurface(ctx->d_func()->eglContext->display(),
-                                                    ctx->d_func()->eglSurface);
-        }
-
-        ctx->d_func()->eglSurface = QEgl::createSurface(ctx->device(),
-                                           ctx->d_func()->eglContext->config());
-
-        eglGetError();  // Clear error state.
-        if (hasPartialUpdateSupport()) {
-            eglSurfaceAttrib(ctx->d_func()->eglContext->display(),
-                                            ctx->d_func()->eglSurface,
-                                            EGL_SWAP_BEHAVIOR, EGL_BUFFER_PRESERVED);
-
-            if (eglGetError() != EGL_SUCCESS)
-                qWarning("QGLWindowSurface: could not enable preserved swap behaviour");
-        } else {
-            eglSurfaceAttrib(ctx->d_func()->eglContext->display(),
-                                            ctx->d_func()->eglSurface,
-                                            EGL_SWAP_BEHAVIOR, EGL_BUFFER_DESTROYED);
-
-            if (eglGetError() != EGL_SUCCESS)
-                qWarning("QGLWindowSurface: could not enable destroyed swap behaviour");
-        }
-    }
-#endif
-
     if (d_ptr->ctx) {
 #ifndef QT_OPENGL_ES_2
         if (d_ptr->destructive_swap_buffers)
-- 
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