Migrating to QOpenGLWidget: blend problems

[QtQtQtQt]

Hello. I started migration from QGLWidget to QOpenGLWidget. I use glEnable(GL_BLEND) and figured out that blending stopped to work after migration. Everything else works fine.

[mrjj]

Hi
Its not releated to
https://forum.qt.io/topic/60770/qpainter-changes-the-rendering-of-openglwidget

Maybe you show the code and in which way its not working?

Im not into openGl but many of the others are
so add some more details and im sure someone knows the answer :)

[QtQtQtQt]

void Glass::initializeGL()
{
    initializeOpenGLFunctions();
     glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    ....
}

void Glass::draw_vert_line(int index)
{
    glEnableClientState(GL_COLOR_ARRAY);
    glPushAttrib(GL_ENABLE_BIT);
    glLineStipple(1, 0x0101);
    glEnable(GL_LINE_STIPPLE);
    glVertexPointer(2, GL_INT, 0, vert_lines[index]); // clear rect
    glColorPointer(4, GL_FLOAT, 0, color);
    glDrawArrays(GL_LINES, 0, 2);
    glPopAttrib();
    glDisableClientState(GL_COLOR_ARRAY);
}

Line not blended. When I use QGLWidget it is.

[the_]

@QtQtQtQt

Would be easier to read if you put your code between
```
```

[QtQtQtQt]

This is because of using QPainter in paintGL() after drawing lines