[Interest] Antialiasing possible on QSGGeometry?

[Mark]

Hi Gunnar,

That's an interesting solution!

But how do i get a QQuickView from within a custom component that
inherits from QQuickItem?
My component is meant to be a QML Plugin, not a standalone QML application.

Cheers,
Mark

On Fri, Jun 7, 2013 at 8:12 AM, Sletta Gunnar <Gunnar.Sletta at digia.com> wrote:
> 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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