Merge branch 'develop'

Change-Id: I7408ac3b14c3a9484d28f8c08eece6210a44025e

20 files changed, 185 insertions, 105 deletions

diff --git a/README b/README
index 998c2f58..acd34527 100644
--- a/README
+++ b/README
@@ -73,6 +73,12 @@ Please refer to the generated documentation for more information:
 Known Issues
 ============
 
+- All other QML elements are drawn on top of the Qt DataVisualization graphs,
+  including the parent elements of the graphs. To ensure the graphs are not
+  hidden, make sure you don't draw anything opaque on top of the graphs.
+  For example, Qt Creator application wizard for Qt Quick 2 applications
+  creates by default an opaque white Rectangle element as the main element,
+  which covers any graph added to it.
 - Using multiple graphs in one application crashes on application shutdown
   unless the last graph to have active context is deleted last.
 - Android doesn't support both widgets and OpenGL simultaneously, so only
diff --git a/examples/audiolevels/audiolevelsiodevice.cpp b/examples/audiolevels/audiolevelsiodevice.cpp
index 970677c6..e4576638 100644
--- a/examples/audiolevels/audiolevelsiodevice.cpp
+++ b/examples/audiolevels/audiolevelsiodevice.cpp
@@ -66,7 +66,7 @@ qint64 AudioLevelsIODevice::writeData(const char *data, qint64 maxSize)
         for (int i = 0; i <= middleRow; i++) {
             QBarDataItem *srcPos = m_array->at(i)->data();
             QBarDataItem *dstPos = srcPos + newDataSize;
-            memmove(dstPos, srcPos, (rowSize - newDataSize) * sizeof(QBarDataItem));
+            memmove((void *)dstPos, (void *)srcPos, (rowSize - newDataSize) * sizeof(QBarDataItem));
         }
     }
 
@@ -90,7 +90,7 @@ qint64 AudioLevelsIODevice::writeData(const char *data, qint64 maxSize)
     for (int i = rowCount - 1; i > middleRow; i--) {
         QBarDataItem *srcPos = m_array->at(index++)->data();
         QBarDataItem *dstPos = m_array->at(i)->data();
-        memcpy(dstPos, srcPos, rowSize * sizeof(QBarDataItem));
+        memcpy((void *)dstPos, (void *)srcPos, rowSize * sizeof(QBarDataItem));
     }
 
     // Reset the proxy array now that data has been updated to trigger a redraw.
diff --git a/examples/qmlbars/qml/qmlbars/main.qml b/examples/qmlbars/qml/qmlbars/main.qml
index 1f8c1a3d..0581f834 100644
--- a/examples/qmlbars/qml/qmlbars/main.qml
+++ b/examples/qmlbars/qml/qmlbars/main.qml
@@ -27,7 +27,6 @@ Item {
     id: mainview
     width: 1280
     height: 1024
-    visible: true
 
     property int buttonLayoutHeight: 180;
     state: Screen.width < Screen.height ? "portrait" : "landscape"
diff --git a/examples/qmlcustominput/qml/qmlcustominput/main.qml b/examples/qmlcustominput/qml/qmlcustominput/main.qml
index f777fd6b..54ec3342 100644
--- a/examples/qmlcustominput/qml/qmlcustominput/main.qml
+++ b/examples/qmlcustominput/qml/qmlcustominput/main.qml
@@ -25,7 +25,6 @@ Item {
     id: mainView
     width: 1280
     height: 720
-    visible: true
 
     Data {
         id: graphData
@@ -182,7 +181,7 @@ Item {
             id: cameraToggle
             Layout.fillHeight: true
             Layout.minimumWidth: parent.width / 3
-            text: "Animate Camera"
+            text: "Pause Camera"
 
             onClicked: {
                 cameraAnimationX.paused = !cameraAnimationX.paused;
diff --git a/examples/qmlscatter/doc/src/qmlscatter.qdoc b/examples/qmlscatter/doc/src/qmlscatter.qdoc
index b0f1fd1f..06719ffc 100644
--- a/examples/qmlscatter/doc/src/qmlscatter.qdoc
+++ b/examples/qmlscatter/doc/src/qmlscatter.qdoc
@@ -86,10 +86,15 @@
     The last \c import just imports all the qml files in the same directory as our \c {main.qml},
     because that's where \c newbutton.qml and \c data.qml are.
 
-    Then we create our main \c Item, call it \c mainView and set it visible:
+    Then we create our main \c Item and call it \c mainView:
 
     \snippet ../examples/qmlscatter/qml/qmlscatter/main.qml 1
 
+    \note The Qt Creator application wizard will set a \c Rectangle item as the main item, which
+    is opaque white by default. This doesn't work for us, because the graphs are rendered behind the other
+    QML elements. We change the main item type to \c Item, which is invisible. This way the graph is
+    not covered by the main item.
+
     Then we'll add another \c Item inside it, and call it \c dataView. This will be the item to hold
     the Scatter3D graph. We'll anchor it to the parent bottom:
 
diff --git a/examples/qmlscatter/qml/qmlscatter/main.qml b/examples/qmlscatter/qml/qmlscatter/main.qml
index 22eab76b..62727f84 100644
--- a/examples/qmlscatter/qml/qmlscatter/main.qml
+++ b/examples/qmlscatter/qml/qmlscatter/main.qml
@@ -26,7 +26,6 @@ import "."
 //! [1]
 Item {
     id: mainView
-    visible: true
     //! [1]
 
     //! [4]
diff --git a/examples/qmlsurface/qml/qmlsurface/main.qml b/examples/qmlsurface/qml/qmlsurface/main.qml
index 07a07891..9f37a3f5 100644
--- a/examples/qmlsurface/qml/qmlsurface/main.qml
+++ b/examples/qmlsurface/qml/qmlsurface/main.qml
@@ -25,7 +25,6 @@ Item {
     id: mainview
     width: 1280
     height: 720
-    visible: true
 
     property int buttonMaximumWidth: surfaceGridToggle.width
     property int buttonMinimumHeight: seriesToggle.height
diff --git a/examples/scatter/doc/src/scatter.qdoc b/examples/scatter/doc/src/scatter.qdoc
index 173ea6e3..9bef441c 100644
--- a/examples/scatter/doc/src/scatter.qdoc
+++ b/examples/scatter/doc/src/scatter.qdoc
@@ -80,7 +80,7 @@
     \snippet ../examples/scatter/scatterdatamodifier.cpp 1
 
     And finally we create a QScatterDataProxy and the associated QScatter3DSeries. We set custom label format
-    for the series and add it to the graph:
+    and mesh smoothing for the series and add it to the graph:
 
     \snippet ../examples/scatter/scatterdatamodifier.cpp 2
 
diff --git a/examples/scatter/scatterdatamodifier.cpp b/examples/scatter/scatterdatamodifier.cpp
index ade4eb59..6cdb1458 100644
--- a/examples/scatter/scatterdatamodifier.cpp
+++ b/examples/scatter/scatterdatamodifier.cpp
@@ -57,6 +57,7 @@ ScatterDataModifier::ScatterDataModifier(Q3DScatter *scatter)
     QScatterDataProxy *proxy = new QScatterDataProxy;
     QScatter3DSeries *series = new QScatter3DSeries(proxy);
     series->setItemLabelFormat("@xTitle: @xLabel @yTitle: @yLabel @zTitle: @zLabel");
+    series->setMeshSmooth(m_smooth);
     m_graph->addSeries(series);
     //! [2]
 
diff --git a/examples/surface/surfacegraph.cpp b/examples/surface/surfacegraph.cpp
index 24ab3715..7ebb6b72 100644
--- a/examples/surface/surfacegraph.cpp
+++ b/examples/surface/surfacegraph.cpp
@@ -49,6 +49,7 @@ SurfaceGraph::SurfaceGraph(Q3DSurface *surface)
     QImage heightMapImage(":/maps/mountain");
     m_heightMapProxy = new QHeightMapSurfaceDataProxy(heightMapImage);
     m_heightMapSeries = new QSurface3DSeries(m_heightMapProxy);
+    m_heightMapSeries->setItemLabelFormat(QStringLiteral("(@xLabel, @zLabel): @yLabel"));
     m_heightMapProxy->setValueRanges(34.0f, 40.0f, 18.0f, 24.0f);
     //! [2]
     m_heightMapWidth = heightMapImage.width();
diff --git a/src/datavisualization/doc/snippets/doc_src_qmldatavisualization.cpp b/src/datavisualization/doc/snippets/doc_src_qmldatavisualization.cpp
index 03f6e847..623f7f6f 100644
--- a/src/datavisualization/doc/snippets/doc_src_qmldatavisualization.cpp
+++ b/src/datavisualization/doc/snippets/doc_src_qmldatavisualization.cpp
@@ -21,86 +21,124 @@ import QtDataVisualization 1.0
 //! [0]
 
 //! [1]
-Bars3D {
-    rows: 4
-    columns: 4
-    barSpacing: Qt.size(0.5, 0.5)
-    barSpacingRelative: false
-
-    Bar3DSeries {
-        itemLabelFormat: "@valueTitle for @colLabel, @rowLabel: @valueLabel"
-
-        ItemModelBarDataProxy {
-            itemModel: model // E.g. a list model defined elsewhere containing monthly expenses data.
-            // Mapping model roles to bar series rows, columns, and values.
-            rowRole: "year"
-            columnRole: "city"
-            valueRole: "expenses"
-            rowCategories: ["2010", "2011", "2012", "2013"]
-            columnCategories: ["Oulu", "Rauma", "Helsinki", "Tampere"]
+import QtQuick 2.0
+import QtDataVisualization 1.0
+
+Item {
+    width: 640
+    height: 480
+
+    Bars3D {
+        width: parent.width
+        height: parent.height
+
+        Bar3DSeries {
+            itemLabelFormat: "@colLabel, @rowLabel: @valueLabel"
+
+            ItemModelBarDataProxy {
+                itemModel: dataModel
+                // Mapping model roles to bar series rows, columns, and values.
+                rowRole: "year"
+                columnRole: "city"
+                valueRole: "expenses"
+            }
         }
     }
+
+    ListModel {
+        id: dataModel
+        ListElement{ year: "2012"; city: "Oulu";     expenses: "4200"; }
+        ListElement{ year: "2012"; city: "Rauma";    expenses: "2100"; }
+        ListElement{ year: "2012"; city: "Helsinki"; expenses: "7040"; }
+        ListElement{ year: "2012"; city: "Tampere";  expenses: "4330"; }
+        ListElement{ year: "2013"; city: "Oulu";     expenses: "3960"; }
+        ListElement{ year: "2013"; city: "Rauma";    expenses: "1990"; }
+        ListElement{ year: "2013"; city: "Helsinki"; expenses: "7230"; }
+        ListElement{ year: "2013"; city: "Tampere";  expenses: "4650"; }
+    }
 }
 //! [1]
 
 //! [2]
-Scatter3D {
-    axisX.segmentCount: 2
-    axisX.subSegmentCount: 2
-    axisX.labelFormat: "%.2f"
-    axisZ.segmentCount: 2
-    axisZ.subSegmentCount: 2
-    axisZ.labelFormat: "%.2f"
-    axisY.segmentCount: 3
-    axisY.subSegmentCount: 2
-    axisY.labelFormat: "%.2f"
-
-    Scatter3DSeries {
-        itemLabelFormat: "X:@xLabel Y:@yLabel Z:@zLabel"
-
-        ItemModelScatterDataProxy {
-            itemModel: model // E.g. a list model defined elsewhere containing point coordinates.
-            // Mapping model roles to scatter series item coordinates.
-            xPosRole: "xPos"
-            yPosRole: "yPos"
-            zPosRole: "zPos"
+import QtQuick 2.0
+import QtDataVisualization 1.0
+
+Item {
+    width: 640
+    height: 480
+
+    Scatter3D {
+        width: parent.width
+        height: parent.height
+        Scatter3DSeries {
+            ItemModelScatterDataProxy {
+                itemModel: dataModel
+                // Mapping model roles to scatter series item coordinates.
+                xPosRole: "xPos"
+                yPosRole: "yPos"
+                zPosRole: "zPos"
+            }
         }
     }
+
+    ListModel {
+        id: dataModel
+        ListElement{ xPos: "2.754"; yPos: "1.455"; zPos: "3.362"; }
+        ListElement{ xPos: "3.164"; yPos: "2.022"; zPos: "4.348"; }
+        ListElement{ xPos: "4.564"; yPos: "1.865"; zPos: "1.346"; }
+        ListElement{ xPos: "1.068"; yPos: "1.224"; zPos: "2.983"; }
+        ListElement{ xPos: "2.323"; yPos: "2.502"; zPos: "3.133"; }
+    }
 }
 //! [2]
 
 //! [3]
-Surface3D {
-    axisX.min: 0.0
-    axisX.max: 10.0
-    axisZ.min: 0.0
-    axisZ.max: 10.0
-    axisY.min: 0.0
-    axisY.max: 5.0
-    axisX.segmentCount: 5
-    axisX.subSegmentCount: 2
-    axisX.labelFormat: "%i"
-    axisZ.segmentCount: 5
-    axisZ.subSegmentCount: 2
-    axisZ.labelFormat: "%i"
-    axisY.segmentCount: 5
-    axisY.labelFormat: "%.1f"
-
-    Surface3DSeries {
-        ItemModelSurfaceDataProxy {
-            itemModel: model // E.g. a list model defined elsewhere containing population data.
-            // Mapping model roles to surface series rows, columns, and values.
-            rowRole: "longitude"
-            columnRole: "latitude"
-            valueRole: "pop_density"
+import QtQuick 2.0
+import QtDataVisualization 1.0
+
+Item {
+    width: 640
+    height: 480
+
+    Surface3D {
+        width: parent.width
+        height: parent.height
+        Surface3DSeries {
+            itemLabelFormat: "Pop density at (@xLabel N, @zLabel E): @yLabel"
+            ItemModelSurfaceDataProxy {
+                itemModel: dataModel
+                // Mapping model roles to surface series rows, columns, and values.
+                rowRole: "longitude"
+                columnRole: "latitude"
+                valueRole: "pop_density"
+            }
         }
     }
+    ListModel {
+        id: dataModel
+        ListElement{ longitude: "20"; latitude: "10"; pop_density: "4.75"; }
+        ListElement{ longitude: "21"; latitude: "10"; pop_density: "3.00"; }
+        ListElement{ longitude: "22"; latitude: "10"; pop_density: "1.24"; }
+        ListElement{ longitude: "23"; latitude: "10"; pop_density: "2.53"; }
+        ListElement{ longitude: "20"; latitude: "11"; pop_density: "2.55"; }
+        ListElement{ longitude: "21"; latitude: "11"; pop_density: "2.03"; }
+        ListElement{ longitude: "22"; latitude: "11"; pop_density: "3.46"; }
+        ListElement{ longitude: "23"; latitude: "11"; pop_density: "5.12"; }
+        ListElement{ longitude: "20"; latitude: "12"; pop_density: "1.37"; }
+        ListElement{ longitude: "21"; latitude: "12"; pop_density: "2.98"; }
+        ListElement{ longitude: "22"; latitude: "12"; pop_density: "3.33"; }
+        ListElement{ longitude: "23"; latitude: "12"; pop_density: "3.23"; }
+        ListElement{ longitude: "20"; latitude: "13"; pop_density: "4.34"; }
+        ListElement{ longitude: "21"; latitude: "13"; pop_density: "3.54"; }
+        ListElement{ longitude: "22"; latitude: "13"; pop_density: "1.65"; }
+        ListElement{ longitude: "23"; latitude: "13"; pop_density: "2.67"; }
+    }
 }
 //! [3]
 
 //! [7]
 ItemModelBarDataProxy {
-    itemModel: model // E.g. a list model defined elsewhere containing monthly expenses data.
+    itemModel: model // E.g. a list model defined elsewhere containing yearly expenses data.
     // Mapping model roles to bar series rows, columns, and values.
     rowRole: "year"
     columnRole: "city"
diff --git a/src/datavisualization/doc/src/qtdatavisualization-qml-bars3d.qdoc b/src/datavisualization/doc/src/qtdatavisualization-qml-bars3d.qdoc
index fc1b732c..edeb5530 100644
--- a/src/datavisualization/doc/src/qtdatavisualization-qml-bars3d.qdoc
+++ b/src/datavisualization/doc/src/qtdatavisualization-qml-bars3d.qdoc
@@ -36,6 +36,11 @@
  *
  * See \l{Qt Quick 2 Bars Example} for more thorough usage example.
  *
+ * \note Qt Data Visualization graphs are rendered behind any other QML elements on screen, including
+ * the parent elements of the graph. To make the whole graph show, ensure that no other element
+ * draws anything over the area the graph occupies. For example, having a non-transparent \c Rectangle
+ * item as the parent of a graph causes the graph to be hidden.
+ *
  * \sa Bar3DSeries, ItemModelBarDataProxy, Scatter3D, Surface3D, {Qt Data Visualization C++ Classes}
  */
 
@@ -83,6 +88,7 @@
 
 /*!
  * \qmlproperty list<QBar3DSeries> Bars3D::seriesList
+ * \default
  * This property holds the series of the graph.
  * By default, this property contains an empty list.
  * To set the series, either use the addSeries() function or define them as children of the graph.
diff --git a/src/datavisualization/doc/src/qtdatavisualization-qml-scatter3d.qdoc b/src/datavisualization/doc/src/qtdatavisualization-qml-scatter3d.qdoc
index 1f04424f..0a8e1674 100644
--- a/src/datavisualization/doc/src/qtdatavisualization-qml-scatter3d.qdoc
+++ b/src/datavisualization/doc/src/qtdatavisualization-qml-scatter3d.qdoc
@@ -36,6 +36,11 @@
 
   See \l{Qt Quick 2 Scatter Example} for more thorough usage example.
 
+  \note Qt Data Visualization graphs are rendered behind any other QML elements on screen, including
+  the parent elements of the graph. To make the whole graph show, ensure that no other element
+  draws anything over the area the graph occupies. For example, having a non-transparent \c Rectangle
+  item as the parent of a graph causes the graph to be hidden.
+
   \sa Scatter3DSeries, ScatterDataProxy, Bars3D, Surface3D, {Qt Data Visualization C++ Classes}
  */
 
@@ -68,6 +73,7 @@
 
 /*!
  * \qmlproperty list<QScatter3DSeries> Scatter3D::seriesList
+ * \default
  * This property holds the series of the graph.
  * By default, this property contains an empty list.
  * To set the series, either use the addSeries() function or define them as children of the graph.
diff --git a/src/datavisualization/doc/src/qtdatavisualization-qml-surface3d.qdoc b/src/datavisualization/doc/src/qtdatavisualization-qml-surface3d.qdoc
index a3886008..b28d30a7 100644
--- a/src/datavisualization/doc/src/qtdatavisualization-qml-surface3d.qdoc
+++ b/src/datavisualization/doc/src/qtdatavisualization-qml-surface3d.qdoc
@@ -36,6 +36,11 @@
 
   See \l{Qt Quick 2 Surface Example} for more thorough usage example.
 
+  \note Qt Data Visualization graphs are rendered behind any other QML elements on screen, including
+  the parent elements of the graph. To make the whole graph show, ensure that no other element
+  draws anything over the area the graph occupies. For example, having a non-transparent \c Rectangle
+  item as the parent of a graph causes the graph to be hidden.
+
   \sa Surface3DSeries, ItemModelSurfaceDataProxy, Bars3D, Scatter3D, {Qt Data Visualization C++ Classes}
  */
 
@@ -74,6 +79,7 @@
 
 /*!
  * \qmlproperty list<QSurface3DSeries> Surface3D::seriesList
+ * \default
  * This property holds the series of the graph.
  * By default, this property contains an empty list.
  * To set the series, either use the addSeries() function or define them as children of the graph.
diff --git a/src/datavisualization/engine/bars3drenderer.cpp b/src/datavisualization/engine/bars3drenderer.cpp
index ecdac21f..f13b6e79 100644
--- a/src/datavisualization/engine/bars3drenderer.cpp
+++ b/src/datavisualization/engine/bars3drenderer.cpp
@@ -99,11 +99,13 @@ Bars3DRenderer::Bars3DRenderer(Bars3DController *controller)
 
 Bars3DRenderer::~Bars3DRenderer()
 {
-    m_textureHelper->glDeleteFramebuffers(1, &m_selectionFrameBuffer);
-    m_textureHelper->glDeleteRenderbuffers(1, &m_selectionDepthBuffer);
-    m_textureHelper->deleteTexture(&m_selectionTexture);
-    m_textureHelper->glDeleteFramebuffers(1, &m_depthFrameBuffer);
-    m_textureHelper->deleteTexture(&m_bgrTexture);
+    if (QOpenGLContext::currentContext()) {
+        m_textureHelper->glDeleteFramebuffers(1, &m_selectionFrameBuffer);
+        m_textureHelper->glDeleteRenderbuffers(1, &m_selectionDepthBuffer);
+        m_textureHelper->deleteTexture(&m_selectionTexture);
+        m_textureHelper->glDeleteFramebuffers(1, &m_depthFrameBuffer);
+        m_textureHelper->deleteTexture(&m_bgrTexture);
+    }
 
     delete m_barShader;
     delete m_barGradientShader;
diff --git a/src/datavisualization/engine/drawer.cpp b/src/datavisualization/engine/drawer.cpp
index 14f0b315..f78b2d29 100644
--- a/src/datavisualization/engine/drawer.cpp
+++ b/src/datavisualization/engine/drawer.cpp
@@ -56,7 +56,8 @@ Drawer::Drawer(Q3DTheme *theme)
 Drawer::~Drawer()
 {
     delete m_textureHelper;
-    glDeleteBuffers(1, &m_pointbuffer);
+    if (QOpenGLContext::currentContext())
+        glDeleteBuffers(1, &m_pointbuffer);
 }
 
 void Drawer::initializeOpenGL()
diff --git a/src/datavisualization/engine/scatter3drenderer.cpp b/src/datavisualization/engine/scatter3drenderer.cpp
index 00452cf7..ee5c119e 100644
--- a/src/datavisualization/engine/scatter3drenderer.cpp
+++ b/src/datavisualization/engine/scatter3drenderer.cpp
@@ -98,11 +98,13 @@ Scatter3DRenderer::Scatter3DRenderer(Scatter3DController *controller)
 
 Scatter3DRenderer::~Scatter3DRenderer()
 {
-    m_textureHelper->glDeleteFramebuffers(1, &m_selectionFrameBuffer);
-    m_textureHelper->glDeleteRenderbuffers(1, &m_selectionDepthBuffer);
-    m_textureHelper->deleteTexture(&m_selectionTexture);
-    m_textureHelper->glDeleteFramebuffers(1, &m_depthFrameBuffer);
-    m_textureHelper->deleteTexture(&m_bgrTexture);
+    if (QOpenGLContext::currentContext()) {
+        m_textureHelper->glDeleteFramebuffers(1, &m_selectionFrameBuffer);
+        m_textureHelper->glDeleteRenderbuffers(1, &m_selectionDepthBuffer);
+        m_textureHelper->deleteTexture(&m_selectionTexture);
+        m_textureHelper->glDeleteFramebuffers(1, &m_depthFrameBuffer);
+        m_textureHelper->deleteTexture(&m_bgrTexture);
+    }
     delete m_dotShader;
     delete m_dotGradientShader;
     delete m_depthShader;
diff --git a/src/datavisualization/engine/surface3drenderer.cpp b/src/datavisualization/engine/surface3drenderer.cpp
index 7049632d..912edd97 100644
--- a/src/datavisualization/engine/surface3drenderer.cpp
+++ b/src/datavisualization/engine/surface3drenderer.cpp
@@ -134,16 +134,17 @@ Surface3DRenderer::Surface3DRenderer(Surface3DController *controller)
 
 Surface3DRenderer::~Surface3DRenderer()
 {
-    m_textureHelper->glDeleteFramebuffers(1, &m_depthFrameBuffer);
-    m_textureHelper->glDeleteRenderbuffers(1, &m_selectionDepthBuffer);
-    m_textureHelper->glDeleteFramebuffers(1, &m_selectionFrameBuffer);
-
-    m_textureHelper->deleteTexture(&m_depthTexture);
-    m_textureHelper->deleteTexture(&m_depthModelTexture);
-    m_textureHelper->deleteTexture(&m_selectionTexture);
-    m_textureHelper->deleteTexture(&m_selectionResultTexture);
-    m_textureHelper->deleteTexture(&m_uniformGradientTexture);
+    if (QOpenGLContext::currentContext()) {
+        m_textureHelper->glDeleteFramebuffers(1, &m_depthFrameBuffer);
+        m_textureHelper->glDeleteRenderbuffers(1, &m_selectionDepthBuffer);
+        m_textureHelper->glDeleteFramebuffers(1, &m_selectionFrameBuffer);
 
+        m_textureHelper->deleteTexture(&m_depthTexture);
+        m_textureHelper->deleteTexture(&m_depthModelTexture);
+        m_textureHelper->deleteTexture(&m_selectionTexture);
+        m_textureHelper->deleteTexture(&m_selectionResultTexture);
+        m_textureHelper->deleteTexture(&m_uniformGradientTexture);
+    }
     delete m_shader;
     delete m_depthShader;
     delete m_backgroundShader;
@@ -264,6 +265,10 @@ void Surface3DRenderer::updateData()
 
         delete m_surfaceObj;
         m_surfaceObj = 0;
+#if !defined(QT_OPENGL_ES_2)
+        m_textureHelper->fillDepthTexture(m_depthTexture, m_primarySubViewport.size(),
+                                          m_shadowQualityMultiplier, 1.0f);
+#endif
     }
 
     for (int i = 0; i < m_sliceDataArray.size(); i++)
@@ -285,6 +290,12 @@ void Surface3DRenderer::updateSeries(const QList<QAbstract3DSeries *> &seriesLis
 
         QSurface3DSeries::DrawFlags drawMode = series->drawMode();
         m_cachedSurfaceVisible = drawMode.testFlag(QSurface3DSeries::DrawSurface);
+#if !defined(QT_OPENGL_ES_2)
+        if (!m_cachedSurfaceVisible) {
+            m_textureHelper->fillDepthTexture(m_depthTexture, m_primarySubViewport.size(),
+                                              m_shadowQualityMultiplier, 1.0f);
+        }
+#endif
         m_cachedSurfaceGridOn = drawMode.testFlag(QSurface3DSeries::DrawWireframe);
 
         QVector3D seriesColor = Utils::vectorFromColor(series->baseColor());
@@ -304,11 +315,9 @@ void Surface3DRenderer::updateRows(const QVector<int> &rows)
     const QSurfaceDataArray *array = 0;
     if (m_visibleSeriesList.size()) {
         QSurface3DSeries *firstSeries = static_cast<QSurface3DSeries *>(m_visibleSeriesList.at(0).series());
-        if (m_cachedSurfaceGridOn || m_cachedSurfaceVisible) {
-            QSurfaceDataProxy *dataProxy = firstSeries->dataProxy();
-            if (dataProxy)
-                array = dataProxy->array();
-        }
+        QSurfaceDataProxy *dataProxy = firstSeries->dataProxy();
+        if (dataProxy)
+            array = dataProxy->array();
     }
 
     if (array && array->size() >= 2 && array->at(0)->size() >= 2 &&
@@ -346,11 +355,9 @@ void Surface3DRenderer::updateItem(const QVector<QPoint> &points)
     const QSurfaceDataArray *array = 0;
     if (m_visibleSeriesList.size()) {
         QSurface3DSeries *firstSeries = static_cast<QSurface3DSeries *>(m_visibleSeriesList.at(0).series());
-        if (m_cachedSurfaceGridOn || m_cachedSurfaceVisible) {
-            QSurfaceDataProxy *dataProxy = firstSeries->dataProxy();
-            if (dataProxy)
-                array = dataProxy->array();
-        }
+        QSurfaceDataProxy *dataProxy = firstSeries->dataProxy();
+        if (dataProxy)
+            array = dataProxy->array();
     }
 
     if (array && array->size() >= 2 && array->at(0)->size() >= 2 &&
diff --git a/src/datavisualization/utils/abstractobjecthelper.cpp b/src/datavisualization/utils/abstractobjecthelper.cpp
index d47f2fe6..96cdc0c4 100644
--- a/src/datavisualization/utils/abstractobjecthelper.cpp
+++ b/src/datavisualization/utils/abstractobjecthelper.cpp
@@ -34,10 +34,12 @@ AbstractObjectHelper::AbstractObjectHelper()
 
 AbstractObjectHelper::~AbstractObjectHelper()
 {
-    glDeleteBuffers(1, &m_vertexbuffer);
-    glDeleteBuffers(1, &m_uvbuffer);
-    glDeleteBuffers(1, &m_normalbuffer);
-    glDeleteBuffers(1, &m_elementbuffer);
+    if (QOpenGLContext::currentContext()) {
+        glDeleteBuffers(1, &m_vertexbuffer);
+        glDeleteBuffers(1, &m_uvbuffer);
+        glDeleteBuffers(1, &m_normalbuffer);
+        glDeleteBuffers(1, &m_elementbuffer);
+    }
 }
 
 GLuint AbstractObjectHelper::vertexBuf()
diff --git a/src/datavisualization/utils/surfaceobject.cpp b/src/datavisualization/utils/surfaceobject.cpp
index 605376e2..6e4765e5 100644
--- a/src/datavisualization/utils/surfaceobject.cpp
+++ b/src/datavisualization/utils/surfaceobject.cpp
@@ -39,7 +39,8 @@ SurfaceObject::SurfaceObject()
 
 SurfaceObject::~SurfaceObject()
 {
-    glDeleteBuffers(1, &m_gridElementbuffer);
+    if (QOpenGLContext::currentContext())
+        glDeleteBuffers(1, &m_gridElementbuffer);
 }
 
 void SurfaceObject::setUpSmoothData(const QSurfaceDataArray &dataArray, const QRect &space,