Fix hanging at application exit

Task-number: QTBUG-75256
Task-number: QTBUG-69627
Change-Id: If4221c8fcf783daf4bf6a38dbf1b9633a20eafb0
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>

src/datavisualization/engine/abstract3drenderer.cpp

@@ -122,7 +122,6 @@ Abstract3DRenderer::Abstract3DRenderer(Abstract3DController *controller)
       m_funcs_2_1(0),
 #endif
       m_context(0),
-      m_dummySurfaceAtDelete(0),
       m_isOpenGLES(true)
 
 {
@@ -153,6 +152,7 @@ Abstract3DRenderer::Abstract3DRenderer(Abstract3DController *controller)
 
 Abstract3DRenderer::~Abstract3DRenderer()
 {
+    contextCleanup();
     delete m_drawer;
     delete m_cachedScene;
     delete m_cachedTheme;
@@ -186,18 +186,18 @@ Abstract3DRenderer::~Abstract3DRenderer()
     if (m_textureHelper) {
         m_textureHelper->deleteTexture(&m_depthTexture);
         m_textureHelper->deleteTexture(&m_cursorPositionTexture);
-
-        if (QOpenGLContext::currentContext())
-            m_textureHelper->glDeleteFramebuffers(1, &m_cursorPositionFrameBuffer);
-
         delete m_textureHelper;
     }
 
     m_axisCacheX.clearLabels();
     m_axisCacheY.clearLabels();
     m_axisCacheZ.clearLabels();
+}
 
-    restoreContextAfterDelete();
+void Abstract3DRenderer::contextCleanup()
+{
+    if (QOpenGLContext::currentContext())
+        m_textureHelper->glDeleteFramebuffers(1, &m_cursorPositionFrameBuffer);
 }
 
 void Abstract3DRenderer::initializeOpenGL()
@@ -233,6 +233,9 @@ void Abstract3DRenderer::initializeOpenGL()
 
     loadLabelMesh();
     loadPositionMapperMesh();
+
+    QObject::connect(m_context, &QOpenGLContext::aboutToBeDestroyed,
+                     this, &Abstract3DRenderer::contextCleanup);
 }
 
 void Abstract3DRenderer::render(const GLuint defaultFboHandle)
@@ -1814,29 +1817,6 @@ void Abstract3DRenderer::queriedGraphPosition(const QMatrix4x4 &projectionViewMa
     m_graphPositionQueryPending = false;
 }
 
-void Abstract3DRenderer::fixContextBeforeDelete()
-{
-    // Only need to fix context if the current context is null.
-    // Otherwise we expect it to be our shared context, so we can use it for cleanup.
-    if (!QOpenGLContext::currentContext() && !m_context.isNull()
-            && QThread::currentThread() == this->thread()) {
-        m_dummySurfaceAtDelete = new QOffscreenSurface();
-        m_dummySurfaceAtDelete->setFormat(m_context->format());
-        m_dummySurfaceAtDelete->create();
-
-        m_context->makeCurrent(m_dummySurfaceAtDelete);
-    }
-}
-
-void Abstract3DRenderer::restoreContextAfterDelete()
-{
-    if (m_dummySurfaceAtDelete)
-        m_context->doneCurrent();
-
-    delete m_dummySurfaceAtDelete;
-    m_dummySurfaceAtDelete = 0;
-}
-
 void Abstract3DRenderer::calculatePolarXZ(const QVector3D &dataPos, float &x, float &z) const
 {
     // x is angular, z is radial

src/datavisualization/engine/abstract3drenderer_p.h

@@ -191,6 +191,7 @@ Q_SIGNALS:
 protected:
     Abstract3DRenderer(Abstract3DController *controller);
 
+    virtual void contextCleanup();
     virtual void initializeOpenGL();
 
     void reInitShaders();
@@ -242,9 +243,6 @@ protected:
     void queriedGraphPosition(const QMatrix4x4 &projectionViewMatrix, const QVector3D &scaling,
                               GLuint defaultFboHandle);
 
-    void fixContextBeforeDelete();
-    void restoreContextAfterDelete();
-
     bool m_hasNegativeValues;
     Q3DTheme *m_cachedTheme;
     Drawer *m_drawer;
@@ -339,7 +337,6 @@ protected:
     QOpenGLFunctions_2_1 *m_funcs_2_1;  // Not owned
 #endif
     QPointer<QOpenGLContext> m_context; // Not owned
-    QOffscreenSurface *m_dummySurfaceAtDelete;
     bool m_isOpenGLES;
 
 private:

src/datavisualization/engine/bars3drenderer.cpp

@@ -100,8 +100,16 @@ Bars3DRenderer::Bars3DRenderer(Bars3DController *controller)
 
 Bars3DRenderer::~Bars3DRenderer()
 {
-    fixContextBeforeDelete();
+    contextCleanup();
+    delete m_barShader;
+    delete m_barGradientShader;
+    delete m_depthShader;
+    delete m_selectionShader;
+    delete m_backgroundShader;
+}
 
+void Bars3DRenderer::contextCleanup()
+{
     if (QOpenGLContext::currentContext()) {
         m_textureHelper->glDeleteFramebuffers(1, &m_selectionFrameBuffer);
         m_textureHelper->glDeleteRenderbuffers(1, &m_selectionDepthBuffer);
@@ -109,12 +117,6 @@ Bars3DRenderer::~Bars3DRenderer()
         m_textureHelper->glDeleteFramebuffers(1, &m_depthFrameBuffer);
         m_textureHelper->deleteTexture(&m_bgrTexture);
     }
-
-    delete m_barShader;
-    delete m_barGradientShader;
-    delete m_depthShader;
-    delete m_selectionShader;
-    delete m_backgroundShader;
 }
 
 void Bars3DRenderer::initializeOpenGL()

src/datavisualization/engine/bars3drenderer_p.h

@@ -134,6 +134,7 @@ public:
     void updateMargin(float margin);
 
 protected:
+    void contextCleanup();
     virtual void initializeOpenGL();
     virtual void fixCameraTarget(QVector3D &target);
     virtual void getVisibleItemBounds(QVector3D &minBounds, QVector3D &maxBounds);

src/datavisualization/engine/scatter3drenderer.cpp

@@ -87,15 +87,7 @@ Scatter3DRenderer::Scatter3DRenderer(Scatter3DController *controller)
 
 Scatter3DRenderer::~Scatter3DRenderer()
 {
-    fixContextBeforeDelete();
-
-    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);
-    }
+    contextCleanup();
     delete m_dotShader;
     delete m_staticSelectedItemGradientShader;
     delete m_staticSelectedItemShader;
@@ -106,6 +98,17 @@ Scatter3DRenderer::~Scatter3DRenderer()
     delete m_staticGradientPointShader;
 }
 
+void Scatter3DRenderer::contextCleanup()
+{
+    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);
+    }
+}
+
 void Scatter3DRenderer::initializeOpenGL()
 {
     Abstract3DRenderer::initializeOpenGL();

src/datavisualization/engine/scatter3drenderer_p.h

@@ -120,6 +120,7 @@ public Q_SLOTS:
     void updateSelectedItem(int index, QScatter3DSeries *series);
 
 protected:
+    void contextCleanup();
     virtual void initializeOpenGL();
     virtual void fixCameraTarget(QVector3D &target);
     virtual void getVisibleItemBounds(QVector3D &minBounds, QVector3D &maxBounds);

src/datavisualization/engine/surface3drenderer.cpp

@@ -95,17 +95,7 @@ Surface3DRenderer::Surface3DRenderer(Surface3DController *controller)
 
 Surface3DRenderer::~Surface3DRenderer()
 {
-    fixContextBeforeDelete();
-
-    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_noShadowTexture);
-        m_textureHelper->deleteTexture(&m_depthTexture);
-        m_textureHelper->deleteTexture(&m_selectionResultTexture);
-    }
+    contextCleanup();
     delete m_depthShader;
     delete m_backgroundShader;
     delete m_selectionShader;
@@ -118,6 +108,19 @@ Surface3DRenderer::~Surface3DRenderer()
     delete m_surfaceSliceSmoothShader;
 }
 
+void Surface3DRenderer::contextCleanup()
+{
+    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_noShadowTexture);
+        m_textureHelper->deleteTexture(&m_depthTexture);
+        m_textureHelper->deleteTexture(&m_selectionResultTexture);
+    }
+}
+
 void Surface3DRenderer::initializeOpenGL()
 {
     Abstract3DRenderer::initializeOpenGL();

src/datavisualization/engine/surface3drenderer_p.h

@@ -116,6 +116,7 @@ public:
     void render(GLuint defaultFboHandle = 0);
 
 protected:
+    void contextCleanup();
     void initializeOpenGL();
     virtual void fixCameraTarget(QVector3D &target);
     virtual void getVisibleItemBounds(QVector3D &minBounds, QVector3D &maxBounds);