Qt5OpenGL: use OpenGL debug logger to locate problems, fix a couple of errors

src/Gui/Flag.cpp

@@ -125,7 +125,9 @@ void Flag::drawLine (View3DInventorViewer* v, int tox, int toy)
 
     GLPainter p;
     p.begin(v->getGLWidget());
+#if !defined(HAVE_QT5_OPENGL)
     p.setDrawBuffer(GL_BACK);
+#endif
 
     // the line
     p.setLineWidth(1.0f);

src/Gui/GLPainter.cpp

@@ -61,6 +61,7 @@ bool GLPainter::begin(QPaintDevice * device)
 
     glMatrixMode(GL_PROJECTION);
     glPushMatrix();
+
     glLoadIdentity();
     glOrtho(0, this->width, 0, this->height, -1, 1);
 
@@ -80,7 +81,9 @@ bool GLPainter::begin(QPaintDevice * device)
     glLineWidth(1.0f);
     glColor4f(1.0, 1.0, 1.0, 0.0);
     glViewport(0, 0, this->width, this->height);
+#if !defined(HAVE_QT5_OPENGL)
     glDrawBuffer(GL_FRONT);
+#endif
 
     return true;
 }
@@ -110,7 +113,6 @@ bool GLPainter::end()
     glPopAttrib();
     glPopMatrix();
 
-    viewer->doneCurrent();
     viewer = 0;
     return true;
 }

src/Gui/Quarter/QuarterWidget.cpp

@@ -65,6 +65,11 @@
 #include <QPaintEvent>
 #include <QResizeEvent>
 
+#if defined(HAVE_QT5_OPENGL)
+#include <QOpenGLDebugMessage>
+#include <QOpenGLDebugLogger>
+#endif
+
 #include <Inventor/SbViewportRegion.h>
 #include <Inventor/system/gl.h>
 #include <Inventor/events/SoEvents.h>
@@ -136,7 +141,7 @@ using namespace SIM::Coin3D::Quarter;
 #ifndef GL_MULTISAMPLE_BIT_EXT
 #define GL_MULTISAMPLE_BIT_EXT 0x20000000
 #endif
-  
+
 //We need to avoid buffer swaping when initializing a QPainter on this widget
 #if defined(HAVE_QT5_OPENGL)
 class CustomGLWidget : public QOpenGLWidget {
@@ -147,9 +152,18 @@ public:
         Q_UNUSED(shareWidget);
         QSurfaceFormat surfaceFormat(format);
         surfaceFormat.setSwapBehavior(QSurfaceFormat::DoubleBuffer);
+        // With the settings below we could determine deprecated OpenGL API
+        // but can't do this since otherwise it will complain about almost any
+        // OpenGL call in Coin3d
+        //surfaceFormat.setMajorVersion(3);
+        //surfaceFormat.setMinorVersion(2);
+        //surfaceFormat.setProfile(QSurfaceFormat::CoreProfile);
+#if defined (_DEBUG) && 1
+        surfaceFormat.setOption(QSurfaceFormat::DebugContext);
+#endif
         setFormat(surfaceFormat);
     }
-  };
+};
 #else
 class CustomGLWidget : public QGLWidget {
 public:
@@ -804,7 +818,8 @@ void QuarterWidget::paintEvent(QPaintEvent* event)
     assert(w->isValid() && "No valid GL context found!");
 
 #if defined(HAVE_QT5_OPENGL)
-    glDrawBuffer(w->format().swapBehavior() == QSurfaceFormat::DoubleBuffer ? GL_BACK : GL_FRONT);
+    // Causes an OpenGL error on resize
+    //glDrawBuffer(w->format().swapBehavior() == QSurfaceFormat::DoubleBuffer ? GL_BACK : GL_FRONT);
 #else
     glDrawBuffer(w->doubleBuffer() ? GL_BACK : GL_FRONT);
 #endif
@@ -820,14 +835,13 @@ void QuarterWidget::paintEvent(QPaintEvent* event)
     glPopAttrib();
 
 #if defined(HAVE_QT5_OPENGL)
-    if (w->format().swapBehavior() == QSurfaceFormat::DoubleBuffer)
-        w->context()->swapBuffers(w->context()->surface());
+    // Causes an OpenGL error on resize
+    //if (w->format().swapBehavior() == QSurfaceFormat::DoubleBuffer)
+    //    w->context()->swapBuffers(w->context()->surface());
 #else
     if (w->doubleBuffer()) { w->swapBuffers(); }
 #endif
 
-    w->doneCurrent();
-
     PRIVATE(this)->autoredrawenabled = true;
 
     // process the delay queue the next time we enter this function,

src/Gui/Thumbnail.cpp

@@ -147,6 +147,5 @@ void Thumbnail::createThumbnailFromFramebuffer(QImage& img) const
         QtGLFramebufferObject fbo(this->size, this->size, format);
         this->viewer->renderToFramebuffer(&fbo);
         img = fbo.toImage();
-        static_cast<QtGLWidget*>(this->viewer->getGLWidget())->doneCurrent();
     }
 }

src/Gui/View3DInventor.cpp

@@ -603,8 +603,6 @@ void View3DInventor::previewFromFramebuffer(const QRect& rect, QImage& img)
     _viewer->setBackgroundColor(col);
     _viewer->setGradientBackground(on);
     img = fbo.toImage();
-
-    static_cast<QtGLWidget*>(_viewer->getGLWidget())->doneCurrent();
 }
 
 // **********************************************************************************

src/Gui/View3DInventorViewer.cpp

@@ -1351,7 +1351,6 @@ void View3DInventorViewer::setRenderType(const RenderType type)
                 framebuffer = fbo;
             }
 #endif
-            gl->doneCurrent();
         }
         break;
     case Image:
@@ -1405,7 +1404,7 @@ QImage View3DInventorViewer::grabFramebuffer()
         res = fbo.toImage(false);
     }
 #endif
-    gl->doneCurrent();
+
     return res;
 }
 

src/Gui/View3DPy.cpp

@@ -729,8 +729,6 @@ void View3DInventorPy::createImageFromFramebuffer(int width, int height, const Q
     viewer->setBackgroundColor(col);
     viewer->setGradientBackground(on);
     img = fbo.toImage();
-
-    static_cast<QtGLWidget*>(viewer->getGLWidget())->doneCurrent();
 }
 
 Py::Object View3DInventorPy::saveImage(const Py::Tuple& args)

src/Mod/Image/Gui/OpenGLImageBox.cpp

@@ -97,9 +97,8 @@ GLImageBox::GLImageBox(QWidget * parent, Qt::WindowFlags f)
     _pColorMap = 0;
     _numMapEntries = 0;
 
-#ifdef _DEBUG
+#if defined(_DEBUG) && 0
     QSurfaceFormat format;
-    format.setProfile(QSurfaceFormat::CoreProfile);
     format.setOption(QSurfaceFormat::DebugContext);
     this->setFormat(format);
 #endif
@@ -132,19 +131,7 @@ void GLImageBox::initializeGL()
         haveMesa = (ver.find("Mesa") != std::string::npos);
     }
 
-#if _DEBUG
-#if 0
-    QString ext = QString::fromLatin1((const char*)(glGetString(GL_EXTENSIONS)));
-    QStringList list = ext.split(QLatin1Char(' '));
-    std::list<std::string> extlist;
-    Q_FOREACH(QString it, list) {
-        extlist.push_back(it.toStdString());
-    }
-    std::string glRenderer = (const char*)(glGetString(GL_RENDERER));
-    std::string glVendor = (const char*)(glGetString(GL_VENDOR));
-    std::string glVersion = (const char*)(glGetString(GL_VERSION));
-#endif
-
+#if defined(_DEBUG) && 0
     QOpenGLContext *context = QOpenGLContext::currentContext();
     if (context->hasExtension(QByteArrayLiteral("GL_KHR_debug"))) {
         QOpenGLDebugLogger *logger = new QOpenGLDebugLogger(this);