Qt 6.0

Last modified on December 09, 2020

Tuesday December 08, 2020 by Lars Knoll | Feedback

I'm with out a doubt enraged to tell as of late’s liberate of Qt 6.0. It is miles the necessary factor liberate of a model up to date predominant model, and marks a severe milestone for Qt. We began engaged on the preliminary ideas only a few years beforehand, and since then, have connect an enormous effort into rising the next era of Qt.

Qt 6

Qt 5 has been an excellent success by means of the years, and we now have gotten seen a big progress of our specific particular person horrifying and Qt utilization over eight years since we launched Qt 5.0. However the world  has handed via important modifications since 2012. Qt utilization in embedded strategies has skyrocketed, C++ has developed, and up to date 3D graphics APIs have emerged. These are examples of points which have as we exclaim affected Qt.

As a unsuitable-platform framework, Qt wants to change to these altering necessities. We've managed to adapt very properly to many of those necessities all the way in which via the lifetime of Qt 5. Then once more, asserting elephantine supply and binary compatibility all the way in which via the Qt 5 sequence made specific points very now not going to restore inside its lifetime. With Qt 6, now we have now the totally different to salvage modifications and manufacture Qt to be higher kindly to the years however to come back once more.

Thus, the mission of Qt 6 is to allow Qt to be the productiveness platform for the long run. Qt 6.0, as a severe liberate of Qt, gave us a greater degree of freedom to implement up to date features, performance, and higher reinforce as of late and the next day's necessities. Qt 6.0 is a continuation of the Qt 5 sequence, and we now have gotten centered on making migration non-disruptive for customers. I printed a Qt 6 imaginative and prescient weblog put up taking footage the next ideas round 18 months beforehand.

When rising Qt 6, we ensured that Qt’s core values had been adhered to and upheld, together with:

  • Its unsuitable-platform nature, permitting customers to deploy their functions to all desktop, mobile, and embedded platforms the utilization of 1 know-how and from a single codebase
  • Its scalability from low-pause, single-reason devices to high-pause superior desktop functions or linked gadget
  • Its world-class APIs and devices and documentation, simplifying the creation of functions and devices
  • Its maintainability, stability, and compatibility, permitting customers to impact substantial codebases with minimal effort
  • Its substantial developer ecosystem with greater than 1.5 million customers

Qt 6.0 is the necessary factor liberate of the Qt 6 sequence addressing up to date market calls for whereas sustaining the core values on the coronary coronary heart of what we accomplish.

When rising Qt 6, we had an in-depth concentrate on at only a few of Qt's most central formulation to call how lets reinforce them. We came upon a pair of core degree of curiosity areas that we invested with out a doubt enormous time in improving. Those areas embody:

  • Leveraging C++17
  • Subsequent era QML
  • Unique graphics structure
  • Unified 2D and 3D for Qt Rapid
  • CMake manufacture gadget (with qmake quiet supported for functions)

We've of path furthermore hung out doing fairly only a few enhancements in varied areas, too many to say all of them right here, and I counsel you concentrate on on the extra detailed wiki web page. We are furthermore webhosting Meet Qt 6.0 webinar intervals overlaying the Americas/EMEIA and EMEIA/APAC time zones. But let's make the most of a concentrate on at only a few of the highlights.


C++ 17 in Qt 6

With Qt 6 we now require a C++17 properly matched compiler enabling the train extra moderen C++ language constructs when rising Qt and furthermore permits for integration features on the API facet.

Core libraries and APIs

Unparalleled work has lengthy gone into Qt Core, as a result of it's the module that implements principally essentially the most central formulation of Qt. We now have lengthy handed via many areas there and made enhancements. To title only a few of principally essentially the most central ones:

  • The up to date property and binding gadget: This gadget now brings the idea of bindings that made QML this sort of immense success in Qt 5 accessible from C++.
  • Strings and Unicode: With Qt 5, we began aligning Qt totally with Unicode, the connect we carried out numerous the work, however only a few gadgets remained that we now cleaned up for Qt 6. Extra important features will are accessible a separate weblog put up shortly.
  • QList has been a category that was constantly criticized in Qt 5, as a result of it was heap allocating objects saved in there that have been elevated than a pointer, leading to stress on heap allocation applications. In Qt 6, we modified this and unified QList and QVector into one class. Peep our weblog put up about QList in Qt 6 for important features.
  • QMetaType and QVariant are main to how our Qt’s meta-object gadget works. Signals and slots would now not be that which that you may bear with out QMetaType and QVariant is required for dynamic invocations. Those two classes purchased an virtually whole rewrite with Qt 6, and which that you may be taught concerning the numerous features right here.

Other formulation of Qt which might be now not related to graphics have furthermore seen substantial modifications. As an illustration, Qt Concurrent has handed via an virtually whole rewrite and now makes development of multi-threaded functions simpler than ever. Qt Network has seen fairly only a few aesthetic-up and enhancements. Peep this weblog put up for important features.

Unique graphics structure 

The graphics structure of Qt 5 was essential depending on OpenGL as a result of the underlying 3D graphics API. While this was the loyal method in 2012 after we created Qt 5, the market round us has modified critically over the ultimate couple of years with the introduction of Metal and Vulkan. We've a considerable dwelling of varied graphics APIs which might be constantly being outdated on varied platforms. For Qt as a unsuitable-platform framework, this, of path, supposed that we would have liked to change to this and assure our customers can bustle Qt on all of them with most efficiency.

New graphics architecture in Qt 6

So whereas Qt 5 relied on OpenGL for hardware-accelerated graphics, the picture fully modifications with Qt 6. All of our 3D graphics in Qt Rapid is now constructed on high of a model up to date abstraction layer for 3D graphics referred to as RHI (Rendering Hardware Interface). RHI makes it that which that you may bear for Qt to train the native 3D graphics API of the underlying OS/platform. So Qt Rapid will now train Direct3D on Windows and Metal on macOS by default. For important features, have a concentrate on on the weblog put up sequence concerning the RHI. 

The OpenGL express classes in Qt quiet exist, however are with out a doubt moved out of QtGui within the QtOpenGL module. We furthermore added a model up to date module referred to as QtShaderTools to sort out the various shading languages of those APIs in a unsuitable-platform method.

Qt Rapid 3D and Qt 3D

Qt Rapid 3D is a fairly up to date module. It seamlessly extends Qt Rapid with 3D capabilities. With Qt Rapid 3D, our degree of curiosity was to salvage an API that's as straightforward to train as a result of the unique formulation of Qt Rapid (for 2D specific particular person interfaces) whereas providing elephantine reinforce for rising superior 3D scenes. The predominant objective within the once more of this effort has been to allow seamless integration between 2D and 3D comment materials.

This module has seen important enhancements with Qt 6 that we wouldn’t had been in a job to perform within the Qt 5 sequence. Most critically it's now progressively the utilization of the RHI abstraction layer to salvage optimum train of the underlying graphics API and Hardware. Additionally, it now features a necessary deeper and extra performant integration between 2D and 3D comment materials, permitting you to dwelling 2D gadgets staunch right into a 3D scene. It furthermore has vastly improved reinforce for glTF2 and physics-basically primarily based rendering, making it trivial to import assets created in varied salvage devices. There are many fairly a great deal of predominant enhancements within the module, a extra in-depth description might effectively additionally even be reveal in a separate weblog put up.

Qt 3D is now furthermore fixed with high of the RHI abstraction layer, has seen some efficiency enhancements and cleanups. You presumably can get extra important features in two weblog posts by our associate KDAB (right here and right here).

Desktop styling for Qt Rapid

Desktop Styling in Qt 6

When we created the dwelling of controls for Qt Rapid, our degree of curiosity was to salvage them gentle-weight and performant. For that motive, they did now not reinforce desktop styling in Qt 5. Then once more, in Qt 6, we came upon a fashion to salvage them concentrate on & with out a doubt really feel native on desktop working strategies. With 6.0, Qt Rapid now helps native styling on each macOS and Windows. Peep this weblog put up for important features. Native concentrate on & with out a doubt really feel for Android and Linux already existed with the Field matter and Fusion varieties in Qt 5. We are improving these for future Qt releases and are furthermore planning to implement a local vogue for iOS.

Interfacing with platform express performance

Even with Qt providing most performance required to create your utility platform-independently, there may be each so constantly a should interface with platform-explicit performance. In Qt 5, we geared up a dwelling of add-on modules (QtX11Extras, QtWinExtras, QtMacExtras) to attend on with this motive. But this elephantine separation from the comfort of Qt has led to a pair of architectural issues, inconsistencies and code duplication inside Qt. In Qt 6, we made an effort to aesthetic this up and fold the performance geared up by these add-on modules into platform express APIs geared up as we exclaim in Qt. This may salvage interfacing with OS/platform-explicit APIs necessary simpler in Qt 6. Have confidence a concentrate on right here for extra important features.

Plot gadget and Packaging

We furthermore made some with out a doubt enormous modifications in how we manufacture and distribute Qt.  Payment declaring is that Qt 6 itself is now constructed the utilization of CMake. This has furthermore led to important enhancements for all our customers that train CMake to fabricate their initiatives. We can proceed to reinforce qmake for the lifetime of Qt 6, so there simply is not the form of factor as a should salvage any modifications to your manufacture gadget can should you're the utilization of it, however we counsel to train CMake for all up to date initiatives.

Qt 6 furthermore comes with a necessary smaller default tools, and fairly a great deal of of the add-ons are with out a doubt disbursed as separate packages via a tools supervisor. This presents us extra flexibility in adapting liberate schedules of add-ons to market necessities, permitting, for instance, for extra frequent function releases as a result of the core Qt packages or making them accessible for a pair of Qt variations on the equal time. As properly as, we're ready to train the tools supervisor as a present channel for third salvage collectively comment materials. And lastly, it presents our customers extra flexibility as they're going to want to obtain excellent what they with out a doubt want.

Currently, we are the utilization of the current Qt installer as a result of the backend for the tools supervisor, however are investigating picks for future releases. Peep the weblog put up right here for extra important features.


When making modifications for Qt 6, we’ve tried to change our APIs to what we think about is required for the long run whereas on the equal time attempting to spoil as dinky as that which that you may bear for our authentic customers. While your code will want some modifications to salvage the actual that which that you may bear train of Qt 6, we now have gotten tried to salvage porting to the up to date model as straightforward as that which that you may bear.

With out a doubt one in every of many key points we did was to aesthetic up our codebase. All via the lifetime of Qt 5, we deprecated fairly only a few APIs and even whole modules. The very very first thing we did was to make the most of away these to salvage to a leaner Qt for the long run and allow us to change away some points within the once more of that accomplish now not salvage sense anymore as of late.

Then once more, we now have gotten taken care to mark as many of those APIs as that which that you may bear as deprecated in Qt 5.15. Enabling deprecation warnings there and cleansing these up will convey you a protracted method in path of constructing your codebase properly matched with Qt 6.

Just a couple of of principally essentially the most aged APIs which had been eradicated in Qt 5 had been moved staunch right into a Qt5CoreCompat module. It accommodates a pair of broadly outdated classes which had been eradicated from Qt 6, equal to QRegExp, QTextCodec, the mild SAX parser for XML, and only a few varied gadgets. The blueprint of this module is meant as a porting wait on and will effectively quiet now not obtain worm fixes, aside from regressions in opposition to Qt 5 and safety related issues. We counsel that you just train it for porting however then incrementally make the most of away your dependencies to the modules. 

Whenever you occur to admire to should launch porting to Qt 6, we now have gotten a necessary extra detailed porting handbook in our documentation.


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