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Details

Type: Bug
Resolution: Done
Priority: P3: Somewhat important
Fix Version/s: 5.1.1
Affects Version/s: 5.1.0 RC1, 5.1.0
Component/s: GUI: OpenGL
Labels:
None
Environment:
Windows 7, (ANGLE/Desktop OpenGL).
Linux XCB/Noveau

Commits:
032d2c9e8eaa98ba191d5f90fa7509ebdf846ed1

Description

Run the following code. Because QGLWidget is set as viewport to QGraphicsView, shadow is not drawn correctly.
When tested with Qt5.0.1 built with configure option -opengl desktop, this warning is present:
QWindowsGLContext::getProcAddress: Unable to resolve 'glShaderBinary'

When using Qt5.0.1_mingw binary installer this warning is present when runnint the app:
QGLShader::link: "(45,20): warning X3206: implicit truncation of vector type

In Qt4, shadow is drawn correctly and no warnings present. Attach is the images of how it looks in Qt5 and Qt4 and also the test image.

#include "mainwindow.h"
#include <QApplication>
#include <QtWidgets>
#include <QGLWidget>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QGraphicsView *view = new QGraphicsView();
    view->setGeometry(0, 0, 150, 150);

    QGraphicsScene *scene = new QGraphicsScene(view);
    view->setScene(scene);
    QGLWidget* glwidget = new QGLWidget();
    view->setViewport(glwidget);

    QGraphicsPixmapItem *iconDeveloper = new QGraphicsPixmapItem(QPixmap(":/Icons/qt-logo.png"), 0);
    QGraphicsDropShadowEffect *shadowDeveloper = new QGraphicsDropShadowEffect();
    shadowDeveloper->setOffset(QPointF(6, 6));
    iconDeveloper->setGraphicsEffect(shadowDeveloper);
    scene->addItem(iconDeveloper);
    view->show();
    return a.exec();
}