[Octave-bug-tracker] [bug #41819] Qt plotting toolkit anti-aliasing support lacking on some graphics cards

[Rik]

Update of bug #41819 (project octave):

                  Status:               Confirmed => Ready For Test         

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Follow-up Comment #9:

Is there a Qt wizard who knows how to turn on GL_MULTISAMPLE?  This should be
an easy argument to OR in to the list of properties when a window is created.

The corresponding lines from __init_fltk__.cc are


class OpenGL_fltk : public Fl_Gl_Window
{
public:
  OpenGL_fltk (int xx, int yy, int ww, int hh, double num)
    : Fl_Gl_Window (xx, yy, ww, hh, 0), number (num), renderer (),
      in_zoom (false), zoom_box (),  print_mode (false)
  {
    // Ask for double buffering and a depth buffer.
    mode (FL_DEPTH | FL_DOUBLE | FL_MULTISAMPLE);
  }


and


canvas->mode (FL_DEPTH | FL_DOUBLE | FL_MULTISAMPLE);


I'm attaching a changeset that I think does the right thing, but I don't have
a good way to verify it.  It may be that we not only need to turn on
SampleBuffers (a.ka. multisampling), but also set the SampleBuffer size to 4
or 8.  Someone who knows more than I do should look at this patch and decide.


(file #31274)
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Additional Item Attachment:

File name: qt_multisample.cset            Size:0 KB


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