I use Qt 6.2.2 in ubuntu 20.04 and I install OpenGL like this:
sudo apt install libgl1-mesa-dev
After I install my graphics card driver (NVDI 470.86) I get this error each time I open QtCreator IDE.
why did this happen and how can I fix this?
I cant compile examples that use qt quick like Qt Quick 3D - Custom Materials Example
QML debugging is enabled. Only use this in a safe environment.
qt.quick3d.general: Unable to find ideal GL version. QGLXContext:
Failed to create dummy context QRhiGles2: Failed to create temporary
context QRhiGles2: Failed to create context Failed to create RHI
(backend 2) Failed to initialize graphics backend for OpenGL.
output pictures:
output from glxinfo | egrep -i version
I understand that qt creator save its settings in /home/username/.config/QtProject and It understand OpenGL from there.
So I delete my .config folder and reboot my system and let my OS create it again this Fix my problem but as #merosss said that he change his usermod to the video that was one way because qt creator will create it in that path and problem will fix again.
Since I install the NVIDIA driver it seems that Qt cant understand which OpenGL should use and that problem happens.
Had the same problem since this morning. Not sure why this worked (any contribution is appreciated), but I solved it by adding my user to the video group and rebooting:
sudo usermod -a -G video *username*
Related
I am trying to install a C++/Qt/Qml program with CMake. I tried the IFW generator, but I'd rather stick to NSIS64.
Setup install file is correctly generated, and program is correctly installed. But my installed Qt program crashes right away, because
qt.qpa.plugin: Could not find the Qt platform plugin "windows" in ""
It is an easy to solve problem when running the program from the command line: we just need to set QT_QPA_PLATFORM_PLUGIN_PATH to the current directory (I installed/copied qwindows.dll there).
It is strange that the .exe does not look into the current program directory for Qt plugins. Anyways, a way to solve my problem would be: how to set an environment variable in a shortcut .lnk (created by NSIS)?
I have tried a bunch of things with NSIS (added in NSIS.template.in):
CreateShortCut "$SMPROGRAMS\$STARTMENU_FOLDER\#CPACK_NSIS_DISPLAY_NAME#.lnk" "QT_QPA_PLATFORM_PLUGING_PATH=$INSTDIR\bin $INSTDIR\bin\#CPACK_NSIS_DISPLAY_NAME#.exe"
CreateShortCut "$SMPROGRAMS\$STARTMENU_FOLDER\#CPACK_NSIS_DISPLAY_NAME#_cmd.lnk" \
"C:\Windows\System32\cmd.exe" "/c SET QT_QPA_PLATFORM_PLUGING_PATH=$INSTDIR\bin && start $INSTDIR\bin\#CPACK_NSIS_DISPLAY_NAME#.exe"
but this does not compile.
Maybe there is a different way to achieve this. Even if that would work, I would like to avoid setting QT_QPA_PLATFORM_PLUGING_PATH globally during the install, if possible, and restrain it to the program launch.
NOTE: documentation says:
CreateShortcut "$SMPROGRAMS\My Company\My Program.lnk" "$INSTDIR\My Program.exe"
"some command line parameters" "$INSTDIR\My Program.exe" 2 SW_SHOWNORMAL
ALT|CONTROL|SHIFT|F5 "a description"
but I am not too sure about how to use this in my case.
I created file dialogs to select files within a Qt application. When migrating to Qt5 I encounter a regression, the file dialog is much poorer when linking against Qt5 rather than Qt4:
Qt4
Qt5
For example it is very hard for an user to navigate to the network mounted share directories.
The code is as simple as this:
QString path;
path = QFileDialog::getExistingDirectory(this, tr("Pick a file"));
QFileDialog::DontUseNativeDialog does not change anything.
My OS is Ubuntu 16.04, I have both nautilus (3.14.3) and nemo (2.8.7) installed. nemo is configured to be the default file manager:
xdg-mime default nemo.desktop inode/directory application/x-gnome-saved-search
Every other application seems to use the same dialog as the Qt4 file dialog screenshot.
How do I get the "old" file dialog in Qt5?
If I try with QT_QPA_PLATFORMTHEME= ./my_app then I get this:
The following works for me on Ubuntu 16.04 – it is more of a workaround than an actual solution, though:
Edit: First make sure that the package libqt5libqgtk2 is installed. It brings the GTK2 bindings for Qt5. If the package is not installed, the file choosers will look like the last screenshot shown in the question above.
Then, assuming you want to launch your application my_app from a terminal, launch it as follows (mind the space after =):
$ QT_QPA_PLATFORMTHEME= my_app
This is because, according to a bug report on launchpad, there seems to be a problem with the Ubuntu package appmenu-qt5: the package forces Qt5 dialogs to become non-native as a side effect of explicitly setting QT_QPA_PLATFORMTHEME=appmenu-qt5 via /etc/profile.d/appmenu-qt5.sh. Unsetting the platform theme via QT_QPA_PLATFORMTHEME= before launching your application changes this behavior locally.
Edit: When using the described approach, however, the global menu might not work in my_app.
I'm trying to add Coverity Scan static analysis to my Qt project but I'm not able to get the result.
I download the coverity scan build tools and use the following command line:
cov-build --dir cov-int make
Which produces the following log:
...
my build log
...
[WARNING] No files were emitted. This may be due to a problem with your configuration
or because no files were actually compiled by your build command.
Please make sure you have configured the compilers actually used in the compilation.
For more details, please look at:
/Users/martin/dev/builds/ConsoleTest01-Desktop_Qt_5_3_clang_64bit-Debug/cov-int/build-log.txt
How can I go further?
I'm using Qt 5.3.2 under MacOS 10.9.
I didn't read the docs carefully enough: https://scan.coverity.com/download?tab=cxx
I had to configure coverity first by running:
cov-configure --comptype clangcxx --compiler clang++ --template
You need to run qmake first, then you can run the cov-int command with make.
I found it easiest to run cov-int in my build- folder created by Qt-Creator.
I am trying to start working with OpenCL. I have two NVidia graphics card, I installed "developer driver" as well as SDK from NVidia website. I compiled the demos but when I run
./oclDeviceQuery
I see:
OpenCL SW Info:
Error -1001 in clGetPlatformIDs Call
!!!
How can I fix it? Does it mean my nvidia cards cannot be detected? I am running Ubuntu 10.10 and X server works properly with nvidia driver.
I am pretty sure the problem is not related to file permissions as it doesn't work with sudo either.
In my case I have solved it by installing nvidia-modprobe package available in ubuntu (utopic/multiverse). And the driver itself (v346) was installed from https://launchpad.net/~mamarley/+archive/ubuntu/nvidia
Concretely, I have installed nvidia-opencl-icd-346, nvidia-libopencl1-346, nvidia-346-uvm, nvidia-346 and libcuda1-346. Not sure if they are all needed for OpenCL.
This is a result of not installing the ICD portion of Nvidia's openCL runtime. The ICD profile will instruct your application of the different openCL implementations installed on the system as multiple implementations from different vendors can coexist. Whe your application does not find the ICD information it gives the Error -1001.
Run your program as root. In case of success: you have trouble with cl_khr_icd- extension to load the vendor driver.
If you not running X11, you have to create device files manually or by (boot-)script:
ERROR: clGetPlatformIDs -1001 when running OpenCL code (Linux)
Same problem for me on a Linux system. Solution is to add the user to the video group:
# sudo usermod -aG video your-user-name
Since I just spend a couple of hours on this, I thought I would share:
I got the error because I was connected to the machine per remote desktop (mstsc). On the machine itself everything worked fine.
I have been told that it should work with TeamViewer by the way.
Dont know if you ever solved this problem, but I had the same issue and solved it in this post: ERROR: clGetPlatformIDs -1001 when running OpenCL code (Linux)
Hope it helps!
I have solved it in Ubuntu 13.10 saucy for intel opencl by created link:
sudo ln -s /opt/intel/opencl-1.2-3.2.1.16712/etc/intel64.icd /etc/OpenCL/vendors/nvidia.icd
I just ran into this problem on ubuntu 14.04 and I could not find ANY working answers anywhere online including this thread (though this was the first to show up on google). What ended up working for me was to remove ALL previous nvidia software and then to reinstall it using the .run file provided on the nvidia website. Installing the components through apt-get seems to fail for some reason.
1) Download CUDA .run file: https://developer.nvidia.com/cuda-downloads
2) Purge all previous nvidia packages
sudo apt-get purge nvidia-*
3) Install all run file components (you will likely have to stop X or restart in recovery mode to run this)
sudo sh cuda_X.X.XX_linux.run
This is because OpenCL has the same brain damaged one library per vendor setup that OpenGL has. A likely reason for the -1001 error is that you have compiled with a different library than the linker is trying to dynamically load.
So see if this is the problem run:
$ ldd oclDeviceQuery
...
libOpenCL.so.1 => important path here (0x00007fe2c17fb000)
...
Does the path point towards the NVidia-provided libOpenCL.so.1 file? If it doesn't, you should recompile the program with an -L parameter pointing towards the directory containing NVidia's libOpenCL.so.1. If you can't do that, you can override the linker's path like this:
$ LD_LIBRARY_PATH=/path/to/nvidias/lib ./oclDeviceQuery
For me, I was missing the CUDA OpenCL library, Running sudo apt install cuda-opencl-dev-12-0 solved it.
You should get number of platforms, allocate the memory for platforms, again get this platforms and then create context from this platform. There is good example:
http://developer.amd.com/support/KnowledgeBase/Lists/KnowledgeBase/DispForm.aspx?ID=71
This might be due to querying clGetPlatformIDs by multiple threads at the same time
My programming experience is about 1 year of C/C++ experience from high school, but I did my research and wrote a simple program with OpenCL a few months ago. I was able to compile and run this on an Apple computer relatively easily with g++ and the --framework option. Now I'm on my Ubuntu machine and I have no idea how to compile it. The correct drivers have been downloaded along with ATI's Stream SDK (I have an ATI Radeon HD5870). Any help would be appreciated!
Try
locate libOpenCL.so
If it is in one of the standard directories (most likely /usr/lib, or /usr/local/lib) you need to replace "--framework OpenCL" with "-lOpenCL". If g++ cannot find the lib you can tell g++ to look in a specific directory by adding "-L/path/to/library".
I wish I had my Linux to be more helpful... It is probably best if you redownload the ati-stream-sdk, after extracting it, open the Terminal and "cd /path/to/extracted/files"; in that directory execute make && sudo make install
make you probably know this from windows, this compiles, whatever needs to be compiled
&& chains commands together, the following commands will only be executed if the first command succeeded
sudo make install this will put the files in the expected places (sudo executes a command with superuser priviledges, you will have to enter your password)
Hope that helps.
You might be missing the dynamic libraries from the dynamic linker configuration.
Search for where the libraries are. Most likely /usr/lib, or /usr/local/lib.
Make sure the path location is also configured at one of these places:
LD_LIBRARY_PATH - you can set it in you environment shell, like .bashrc
/etc/ld.so.conf - you will need to call ldconfig to update the cache and it requires root access to change the file.
Reason
Aside from #bjoernz, my system can't find the libOpenCL.so file
It's because the correct file directory is missing
After searchig over the internet, I found out that libOpenCL.so file can provided by ocl-icd-opencl-dev package
Solution
You just need to install the package mentioned above by typing into cmd
sudo apt update
sudo apt install ocl-icd-opencl-dev
Therefore, libOpenCL.so can be found under /usr/lib/x86_64-linux-gnu/ folder
My System Information
OS: Ubuntu 16.04 LTS
GPU: NVIDIA GeForce GTX 660
GPU Driver: nvidia-375
OpenCL: 1.2
Reference:
[1] How to install libOpenCL.so on ubuntu
[2] How to set up OpenCL in Linux