1 files changed, 84 insertions, 11 deletions

diff --git a/src/opengl/qwindowsurface_gl.cpp b/src/opengl/qwindowsurface_gl.cpp
index 21b2f09..2ccbc50 100644
--- a/src/opengl/qwindowsurface_gl.cpp
+++ b/src/opengl/qwindowsurface_gl.cpp
@@ -181,17 +181,15 @@ QGLGraphicsSystem::QGLGraphicsSystem(bool useX11GL)
 //
 // QGLWindowSurface
 //
-
 #ifndef Q_WS_QPA
 class QGLGlobalShareWidget
 {
 public:
-    QGLGlobalShareWidget() : widget(0), initializing(false) {}
+    QGLGlobalShareWidget() : firstPixmap(0), widgetRefCount(0), widget(0), initializing(false) {}
 
     QGLWidget *shareWidget() {
         if (!initializing && !widget && !cleanedUp) {
             initializing = true;
-
             widget = new QGLWidget(QGLFormat(QGL::SingleBuffer | QGL::NoDepthBuffer | QGL::NoStencilBuffer));
             widget->resize(1, 1);
 
@@ -227,6 +225,9 @@ public:
 
     static bool cleanedUp;
 
+    QGLPixmapData *firstPixmap;
+    int widgetRefCount;
+
 private:
     QGLWidget *widget;
     bool initializing;
@@ -274,6 +275,43 @@ const QGLContext *qt_gl_share_context()
 #endif
 }
 
+#ifdef QGL_USE_TEXTURE_POOL
+void qt_gl_register_pixmap(QGLPixmapData *pd)
+{
+    QGLGlobalShareWidget *shared = _qt_gl_share_widget();
+    pd->next = shared->firstPixmap;
+    pd->prev = 0;
+    if (shared->firstPixmap)
+        shared->firstPixmap->prev = pd;
+    shared->firstPixmap = pd;
+}
+
+void qt_gl_unregister_pixmap(QGLPixmapData *pd)
+{
+    if (pd->next)
+        pd->next->prev = pd->prev;
+    if (pd->prev) {
+        pd->prev->next = pd->next;
+    } else {
+        QGLGlobalShareWidget *shared = _qt_gl_share_widget();
+        if (shared)
+           shared->firstPixmap = pd->next;
+    }
+}
+
+void qt_gl_hibernate_pixmaps()
+{
+    QGLGlobalShareWidget *shared = _qt_gl_share_widget();
+
+    // Scan all QGLPixmapData objects in the system and hibernate them.
+    QGLPixmapData *pd = shared->firstPixmap;
+    while (pd != 0) {
+        pd->hibernate();
+        pd = pd->next;
+    }
+}
+#endif
+
 struct QGLWindowSurfacePrivate
 {
     QGLFramebufferObject *fbo;
@@ -299,6 +337,8 @@ struct QGLWindowSurfacePrivate
     QList<QImage> buffers;
     QGLWindowSurfaceGLPaintDevice glDevice;
     QGLWindowSurface* q_ptr;
+
+    bool partialUpdateSupport;
 };
 
 QGLFormat QGLWindowSurface::surfaceFormat;
@@ -351,6 +391,7 @@ QGLWindowSurface::QGLWindowSurface(QWidget *window)
     d_ptr->q_ptr = this;
     d_ptr->geometry_updated = false;
     d_ptr->did_paint = false;
+    d_ptr->partialUpdateSupport = false;
 }
 
 QGLWindowSurface::~QGLWindowSurface()
@@ -366,6 +407,27 @@ QGLWindowSurface::~QGLWindowSurface()
     delete d_ptr->pb;
     delete d_ptr->fbo;
     delete d_ptr;
+
+    if (QGLGlobalShareWidget::cleanedUp)
+        return;
+
+    --(_qt_gl_share_widget()->widgetRefCount);
+
+#ifdef QGL_USE_TEXTURE_POOL
+    if (_qt_gl_share_widget()->widgetRefCount <= 0) {
+        // All of the widget window surfaces have been destroyed
+        // but we still have GL pixmaps active.  Ask them to hibernate
+        // to free up GPU resources until a widget is shown again.
+        // This may eventually cause the EGLContext to be destroyed
+        // because nothing in the system needs a context, which will
+        // free up even more GPU resources.
+        qt_gl_hibernate_pixmaps();
+
+        // Destroy the context if necessary.
+        if (!qt_gl_share_widget()->context()->isSharing())
+            qt_destroy_gl_share_widget();
+    }
+#endif
 }
 
 void QGLWindowSurface::deleted(QObject *object)
@@ -415,6 +477,9 @@ void QGLWindowSurface::hijackWindow(QWidget *widget)
 
     ctx->create(qt_gl_share_context());
 
+    if (widget != qt_gl_share_widget())
+        ++(_qt_gl_share_widget()->widgetRefCount);
+
 #ifndef QT_NO_EGL
     static bool checkedForNOKSwapRegion = false;
     static bool haveNOKSwapRegion = false;
@@ -426,14 +491,14 @@ void QGLWindowSurface::hijackWindow(QWidget *widget)
         if (haveNOKSwapRegion)
             qDebug() << "Found EGL_NOK_swap_region2 extension. Using partial updates.";
     }
-
-    if (ctx->d_func()->eglContext->configAttrib(EGL_SWAP_BEHAVIOR) != EGL_BUFFER_PRESERVED &&
-        ! haveNOKSwapRegion)
-        setPartialUpdateSupport(false); // Force full-screen updates
+    bool swapBehaviourPreserved = (ctx->d_func()->eglContext->configAttrib(EGL_SWAP_BEHAVIOR) != EGL_BUFFER_PRESERVED)
+        || (ctx->d_func()->eglContext->configAttrib(EGL_SURFACE_TYPE)&EGL_SWAP_BEHAVIOR_PRESERVED_BIT);
+    if (!swapBehaviourPreserved && !haveNOKSwapRegion)
+        d_ptr->partialUpdateSupport = false; // Force full-screen updates
     else
-        setPartialUpdateSupport(true);
+        d_ptr->partialUpdateSupport = true;
 #else
-    setPartialUpdateSupport(false);
+    d_ptr->partialUpdateSupport = false;
 #endif
 
     widgetPrivate->extraData()->glContext = ctx;
@@ -444,7 +509,9 @@ void QGLWindowSurface::hijackWindow(QWidget *widget)
 
     voidPtrPtr = &widgetPrivate->extraData()->glContext;
     d_ptr->contexts << ctxPtrPtr;
+#ifndef Q_OS_SYMBIAN
     qDebug() << "hijackWindow() context created for" << widget << d_ptr->contexts.size();
+#endif
 }
 
 QGLContext *QGLWindowSurface::context() const
@@ -943,8 +1010,9 @@ void QGLWindowSurface::updateGeometry() {
     if (d_ptr->destructive_swap_buffers)
         initializeOffscreenTexture(surfSize);
 #endif
-
-    qDebug() << "QGLWindowSurface: Using plain widget as window surface" << this;;
+#ifndef Q_OS_SYMBIAN
+    qDebug() << "QGLWindowSurface: Using plain widget as window surface" << this;
+#endif
     d_ptr->ctx = ctx;
     d_ptr->ctx->d_ptr->internal_context = true;
 }
@@ -1081,6 +1149,11 @@ QImage *QGLWindowSurface::buffer(const QWidget *widget)
     return &d_ptr->buffers.last();
 }
 
+bool QGLWindowSurface::hasPartialUpdateSupport() const
+{
+    return d_ptr->partialUpdateSupport;
+}
+
 
 
 QT_END_NAMESPACE