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1

Monday, January 25th 2016, 1:49pm

Build QT OpenGL GUI in Linux

Hi,

I don't have too much experience with QT, so I need some help with this problem:

I am developing a framework in Linux, where I want to create a basic OpenGL GUI class which displays an OpenGL window and maybe some buttons, but not necessarily. From this framework, one should be able to create different applications, so there is a core module with core functionality and a application module for creating applications. I now want to have the possibility to create a different OpenGL GUI for different applications, where the overhead in the application should only be the drawing method. I would like to pass this function pointer to the OpenGL GUI class and let it draw the application specific items. If thats too much of a problem, I would extend this basic class for each application, where I also only have to define a drawing function for this particular application. So my steps to achive this would be:

1.) Build Qt (done)
2.) Import Qt libs into framework using cmake
3,) Use functionality within the framework

Step 1. was straight forward. Step 2 and 3 are already a problem. I add those libs to the cmake lists file like this:

TARGET_LINK_LIBRARIES(appXYZ
Qt5Core
Qt5Gui
Qt5Concurrent
Qt5Widgets
Qt53DInput
Qt53DRenderer
Qt5Declarative
Qt5Multimedia
Qt5OpenGL
)

but the output is this:

Source code

1
2
3
4
5
6
undefined reference to `QGLFormat::QGLFormat(QFlags<QGL::FormatOption>, int)'
undefined reference to `vtable for OpenGLWindow'
undefined reference to `QGLWidget::QGLWidget(QGLFormat const&, QWidget*, QGLWidget const*, QFlags<Qt::WindowType>)'
undefined reference to `QGLFormat::~QGLFormat()'
undefined reference to `QGLWidget::~QGLWidget()'
undefined reference to `QWidget::update()'


and other similar linker errors. The thing is: I could install Qt on the system, but I want it to use the pre-built Qt libraries from the framework, such that a user can checkout the framework and doesn't have to install any 3rd-party software in order to get the framework running. I've read, that I need a ".pro" file where I can add the Qt modules, but I use cmake and I have no idea, how to combine those 2 in the most clean and efficient way, without a lot of overhead.

I would be glad to get some advice from you, thanks!