Zinc widget: added a way to retrieve the FPS.

opencor · Aug 20, 2020 · d10bc71 · d10bc71
1 parent 6e65d4d
commit d10bc71
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Showing 2 changed files with 33 additions and 0 deletions.
diff --git a/src/plugins/widget/ZincWidget/src/zincwidget.cpp b/src/plugins/widget/ZincWidget/src/zincwidget.cpp
@@ -286,6 +286,15 @@ void ZincWidget::viewAll()
 
 //==============================================================================
 
+double ZincWidget::fps() const
+{
+    // Return our FPS
+
+    return mFps;
+}
+
+//==============================================================================
+
 void ZincWidget::createSceneViewer()
 {
     // Create our scene viewer and have it have the same OpenGL properties as
@@ -359,6 +368,10 @@ void ZincWidget::updateSceneViewerViewerportSize(int pWidth, int pHeight,
 
 void ZincWidget::initializeGL()
 {
+    // Start our FPS clock
+
+    mFpsClock.start();
+
     // Forward the fact that our context is going to be destroyed
 
     connect(QOpenGLWidget::context(), &QOpenGLContext::aboutToBeDestroyed,
@@ -378,6 +391,19 @@ void ZincWidget::paintGL()
     updateSceneViewerViewerportSize(width(), height(), true);
 
     mSceneViewer.renderScene();
+
+    // Update our FPS, if needed
+
+    ++mNbOfFrames;
+
+    int fpsClockElapsed = mFpsClock.elapsed();
+
+    if (fpsClockElapsed >= 1000) {
+        mFps = 1000.0*mNbOfFrames/fpsClockElapsed;
+
+        mNbOfFrames = 0;
+        mFpsClock.start();
+    }
 }
 
 //==============================================================================

diff --git a/src/plugins/widget/ZincWidget/src/zincwidget.h b/src/plugins/widget/ZincWidget/src/zincwidget.h
@@ -31,6 +31,7 @@ along with this program. If not, see <https://gnu.org/licenses>.
 //==============================================================================
 
 #include <QOpenGLWidget>
+#include <QTime>
 
 //==============================================================================
 
@@ -118,6 +119,8 @@ class ZINCWIDGET_EXPORT ZincWidget : public QOpenGLWidget,
 
     void viewAll();
 
+    double fps() const;
+
 protected:
     void initializeGL() override;
     void paintGL() override;
@@ -142,6 +145,10 @@ class ZINCWIDGET_EXPORT ZincWidget : public QOpenGLWidget,
     bool mNeedContextMenu = false;
     QMenu *mContextMenu = nullptr;
 
+    QTime mFpsClock;
+    int mNbOfFrames = 0;
+    double mFps = 0.0;
+
     void createSceneViewer();
 
     void updateSceneViewerViewerportSize(int pWidth, int pHeight,