[Interest] Antialiasing possible on QSGGeometry?

[Sletta Gunnar]

You need to set the surface format of your QQuickView.

QQuickView view;
QSurfaceFormat format = view.format();
format.setSamples(16);
view.setFormat(format);
view.show();

If your graphics hardware supports multisample antialiasing, you will now have antialiased geometry.

As the scene graph might require depth/stencil buffer for its renderer, it is a bit important that you inherit the original surface format from the view instead of creating a new one from scratch.

qmlscene supports this out of the box by passing --multisample as a command line option.

cheers,
Gunnar

On Jun 7, 2013, at 12:12 AM, Mark <markg85 at gmail.com> wrote:

> Hi,
> 
> Another day, another question :)
> Don't worry, i plan on making a big blog about everything. This
> information won't get lost.
> 
> So today i'm trying to draw a custom shape by setting vertices. More
> specifically a GL_QUAD_STRIP.
> 
> It looks like this (obviously just testing data)
>    QSGGeometry *geometry = new
> QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 8);
>    geometry->setDrawingMode(GL_QUAD_STRIP);
>    geometry->vertexDataAsPoint2D()[0].set(0, 100);
>    geometry->vertexDataAsPoint2D()[1].set(0, height());
>    geometry->vertexDataAsPoint2D()[2].set(width() / 4, 80);
>    geometry->vertexDataAsPoint2D()[3].set(width() / 4, height());
>    geometry->vertexDataAsPoint2D()[4].set(width() / 2, 110);
>    geometry->vertexDataAsPoint2D()[5].set(width() / 2, height());
>    geometry->vertexDataAsPoint2D()[6].set(width(), 150);
>    geometry->vertexDataAsPoint2D()[7].set(width(), height());
> 
>    QSGFlatColorMaterial *material = new QSGFlatColorMaterial;
>    material->setColor(QColor(255, 0, 0, 128));
> 
>    QSGGeometryNode *n = new QSGGeometryNode;
>    n->setGeometry(geometry);
>    n->setFlag(QSGNode::OwnsGeometry);
>    n->setMaterial(material);
>    n->setFlag(QSGNode::OwnsMaterial);
> 
> So roughly the same as the example [1] only with a quad strip.
> However, this ends up looking a bit aliased.. So the question is: How
> do i get this anti-aliased?
> 
> I did read something about multisampling and setting the number of
> samples, but i can't find such a function in any of the used classes..
> 
> Kind regards,
> Mark
> 
> [1] http://qt-project.org/doc/qt-5.0/qtquick/qsggeometrynode.html
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