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=Qt for Google Native Client=
[[Category:Developing_with_Qt]]


Qt for Native Client allows you to deploy and run Qt applications in supported web browsers. Native Client is currently implemented in the Chrome browser.
Qt for Native Client allows you to deploy and run Qt applications in the Chrome web browser


For a general introduction to Native Client see the [http://code.google.com/p/nativeclient/ project page] ''[code.google.com]'' or the [http://www.youtube.com/watch?v=WgbK0ztUkDM 2011 Google IO talk] ''[youtube.com]''
For a general introduction to Native Client see the [https://developer.chrome.com/native-client project page] or the [http://www.youtube.com/watch?v=WgbK0ztUkDM 2011 Google IO talk]


==Getting Started==
== Getting Started ==


To develop C++-based Qt applications targeting native client you need the following:
You'll need the following:


# A Mac OS X or Gnu/Linux system. Windows is not supported.
# A Mac OS X or Gnu/Linux system. Windows is not supported.
# The nacl [http://code.google.com/chrome/nativeclient/ <span class="caps">SDK</span>] ''[code.google.com]''. Qt is currently developed against <span class="caps">SDK</span> version 18 using glibc toolchain.
# Chrome
# Chrome from Google. Qt is currently developed against Chromium 18+.
# The [https://developer.chrome.com/native-client NaCl SDK].
# “qtbase-nacl” (Qt 5) https://github.com/msorvig/qt5-qtbase-nacl
# [https://github.com/msorvig/qt5-qtbase-nacl qt5-qtbase-nacl]
# “qttools-nacl” (Qt 5) https://github.com/msorvig/qt5-qttools-nacl
# [https://github.com/msorvig/qt5-qtdeclarative-nacl qt5-qtdeclarative-nacl] (Optional, for Qt Quick)


===Configuring and building Qt===
See [https://github.com/msorvig/qt5-qtbase-nacl/blob/nacl-5.4/nacl-readme nacl-readme] in qt5-qtbase-nacl for further instructions.
 
Qt 5 is now the preferred version, and includes improvements such as shared builds, glibc toolchain support and a better nacldeployqt that can create multi-arch app distributions.
 
====32-bit:====
 
./configure -xplatform unsupported/nacl-g++ -device-option <span class="caps">CROSS</span>_COMPILE=/path/to/nacl_sdk/pepper_19/toolchain/mac_x86_glibc/bin/ -nomake examples -nomake tests -developer-build -opensource -confirm-license -reduce-relocations
 
====64-bit:====
 
./configure -xplatform unsupported/nacl64-g++ -device-option <span class="caps">CROSS</span>_COMPILE=/path/to/nacl_sdk/pepper_19/toolchain/mac_x86_glibc/bin/ -nomake tests -developer-build -opensource -confirm-license -release -no-sse2 -no-sse3 -no-ssse3 -no-sse4.1 -no-sse4.2
 
make sub-src (should complete)
 
===Qt Deployment===
 
QtTools now includes the ''nacldeployqt'' tool which supports packaging a Qt app with all its dependencies. Building your app should give you a .nexe file, which nacldeployqt can extract dependencies from.
 
# Build qttools/src/nacldeployqt using <span class="caps">HOST</span> Qt: (/path/to/host/qt/bin/qmake -nocache nacldeployqt.pro)
# Developer deployment: “nacldeployqt MyApp.nexe -server” . Open Chrome at localhost:5103
# Distribution deployment with multiple archs: “nacldeployqt x86-32/MyApp.nexe x86-64/MyApp.nexe targetDirectory”
 
nacldeployqt creates loader html&amp;javascript, the .nmf manifest file, copies dependencies and also generates files that can serve as starting point for Chrome Web Store deployment.
 
==Porting Guide==
 
* Widgets generally work
* OpenGL, [QtDeclarative|Quick|1|2], [QtMultimedia|Kit], or anything else outside of QtBase is not currently supported.
* Q_OS_NACL is your friend
* Re-entering the event loop is not supported. (QFileDialog::getOpenFileName() will not work; QFileDialog::show() can be made to work at some point)
* Window management is tricky and only partially implemented. For best results use one top-level window only.
 
===Roadmap===
 
* OpenGL support
 
==Qt Creator [NOT <span class="caps">TESTED</span> <span class="caps">WITH</span> QT 5]==
 
[https://gitorious.org/qtnativeclient/creator Qt Creator] ''[gitorious.org]'' supports targeting the NaCl toolchain, and launching apps using the chrome(ium) browser. The toolchain and browser are found by looking in the <span class="caps">PATH</span>, make sure “which i686-nacl-gcc” and “which chrome” returns the correct binaries. Also make sure that Qt Creator actually sees the correct <span class="caps">PATH</span>, launching it directly from the terminal usually does the trick.
 
If everything works correctly then there should be a “NaCl GCC” toolchain as well as a “NaCl” target available.
 
To test the installation, start by loading and compiling the industry standard Qt porting example: examples/widgets/wiggly
 
===Categories:===
 
* [[:Category:Developing with Qt|Developing_with_Qt]]

Latest revision as of 22:06, 23 March 2016


Qt for Native Client allows you to deploy and run Qt applications in the Chrome web browser

For a general introduction to Native Client see the project page or the 2011 Google IO talk

Getting Started

You'll need the following:

  1. A Mac OS X or Gnu/Linux system. Windows is not supported.
  2. Chrome
  3. The NaCl SDK.
  4. qt5-qtbase-nacl
  5. qt5-qtdeclarative-nacl (Optional, for Qt Quick)

See nacl-readme in qt5-qtbase-nacl for further instructions.

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