Qt GLFW and GLEW setup

SGaist

Qt does not provide a custom implementation of OpenGL.

Please take a look at the Qt Gui module and what it offers for OpenGL handling.

bence

But I can add libary to Qt, and GLFW is a libary

I created a project, right click on it, add libaries, internal libary, include the path to C:\glfw, and it does not allow me to push to the next button

SGaist

Sure you can, but you might be adding unnecessary dependencies.

Is the library compiled ?
Does the architecture match the one you use for Qt ?
Which compiler was used ?

bence

I do not comailed the libary.
mingw73_64

The other thing that I have tried is that
.pro

TEMPLATE = app
CONFIG += console c++11
CONFIG -= app_bundle
CONFIG -= qt

INCLUDEPATH += "C:\glfw\include\GLFW"

SOURCES += \
        main.cpp

#include <iostream>
#include <glfw3.h>

using namespace std;

int main() {

    cout << "Hello World!" << endl;
    glfwInit();
    return 0;
}

C:\files\C++\file\main.cpp:9: error: undefined reference to `glfwInit'

SGaist

You are not linking the library.

bence

@SGaist

Maybe I am lame but I can't find a .lib file in GLFW folder file

In the GLEW folder C:\glew\lib\Release\x64 there is two .lib file but in the GLFW folder I cannot find any

bence

@SGaist

link there is a pre compailed binary for visual studio

.pro file

TEMPLATE = app
CONFIG += console c++11
CONFIG -= app_bundle
CONFIG -= qt

INCLUDEPATH += "C:\glfw\include\GLFW"

LIBS += -L"C:\glfw\lib-vc2019" -glfw3

SOURCES += \
        main.cpp

main.cpp file

#include <iostream>
#include <glfw3.h>

using namespace std;

int main() {
    cout << "Hello World!" << endl;
    glfwInit();
    return 0;
}

error: unrecognized debug output level 'lfw3'

JonB

@bence said in Qt GLFW and GLEW setup:

LIBS += -L"C:\glfw\lib-vc2019" -glfw3

error: unrecognized debug output level 'lfw3'

Where do yo u get the -glfw3 from? For gcc, for example, the -g is a compiler debugging flag, which would give your error.

bence

@JonB now I know that waht was the problem I have to use

LIBS += -L"C:\glfw\lib-vc2019" -lglfw3

But this time I get 120 issues

I assume that I cannot use GLFW Visual Studio precompile libary. But I cannot know what should I do.

JonB

@bence
If you only have libraries for VS/MSVC I believe you have to use that tool chain.

bence

@JonB

I do not install VS to my PC.

I am sure that there is other way to do that.

I believe Qt is a excellent platform so there have to be a way to use original OpenGL

If you have any idea who could I use the original OpenGL in Qt I would really appriciate it.

SGaist

Your issue is not related to Qt. You are trying to mix and match C++ libraries built with two different compilers. You can't use C++ libraries built with Visual Studio when using MinGW and it's the same the other way around.

As I already explained Qt does not implement a custom version of OpenGL. You already have access the functions. You are currently making your life more complicated than need be.

bence

@SGaist

Simpley I do not want to install Visual Studio to use the original OpenGL that why I asked who could I do that.

This youtube is out of date he istall the OpenGL but the current version is not the same
Because he can install it there have to be a way that I can use it.

SGaist

The page you linked provides libraries for a lot of compilers including MinGW 32 and 64 bit.

If you can't use any of them, the compile the library yourself.

bence

@SGaist
I right click on the project and add the whole GLFW folder.

.pro file

TEMPLATE = app
CONFIG += console c++11
CONFIG -= app_bundle
CONFIG -= qt

INCLUDEPATH += "C:\glfw\include"
INCLUDEPATH += "C:\glfw\deps"


SOURCES += \
        glfw/deps/getopt.c \
        glfw/deps/glad_gl.c \
        glfw/deps/glad_vulkan.c \
        glfw/deps/tinycthread.c \
        glfw/examples/boing.c \
        glfw/examples/gears.c \
        glfw/examples/heightmap.c \
        glfw/examples/offscreen.c \
        glfw/examples/particles.c \
        glfw/examples/sharing.c \
        glfw/examples/simple.c \
        glfw/examples/splitview.c \
        glfw/examples/wave.c \
        glfw/src/cocoa_time.c \
        glfw/src/context.c \
        glfw/src/egl_context.c \
        glfw/src/glx_context.c \
        glfw/src/init.c \
        glfw/src/input.c \
        glfw/src/linux_joystick.c \
        glfw/src/monitor.c \
        glfw/src/null_init.c \
        glfw/src/null_joystick.c \
        glfw/src/null_monitor.c \
        glfw/src/null_window.c \
        glfw/src/osmesa_context.c \
        glfw/src/posix_thread.c \
        glfw/src/posix_time.c \
        glfw/src/vulkan.c \
        glfw/src/wgl_context.c \
        glfw/src/win32_init.c \
        glfw/src/win32_joystick.c \
        glfw/src/win32_monitor.c \
        glfw/src/win32_thread.c \
        glfw/src/win32_time.c \
        glfw/src/win32_window.c \
        glfw/src/window.c \
        glfw/src/wl_init.c \
        glfw/src/wl_monitor.c \
        glfw/src/wl_window.c \
        glfw/src/x11_init.c \
        glfw/src/x11_monitor.c \
        glfw/src/x11_window.c \
        glfw/src/xkb_unicode.c \
        main.cpp

DISTFILES += \
    glfw/CMake/GenerateMappings.cmake \
    glfw/CMake/MacOSXBundleInfo.plist.in \
    glfw/CMake/i686-w64-mingw32-clang.cmake \
    glfw/CMake/i686-w64-mingw32.cmake \
    glfw/CMake/modules/FindEpollShim.cmake \
    glfw/CMake/modules/FindOSMesa.cmake \
    glfw/CMake/modules/FindWaylandProtocols.cmake \
    glfw/CMake/modules/FindXKBCommon.cmake \
    glfw/CMake/x86_64-w64-mingw32-clang.cmake \
    glfw/CMake/x86_64-w64-mingw32.cmake \
    glfw/CMakeLists.txt \
    glfw/cmake_uninstall.cmake.in \
    glfw/examples/CMakeLists.txt \
    glfw/examples/glfw.icns \
    glfw/examples/glfw.ico \
    glfw/examples/glfw.rc \
    glfw/src/CMakeLists.txt \
    glfw/src/cocoa_init.m \
    glfw/src/cocoa_joystick.m \
    glfw/src/cocoa_monitor.m \
    glfw/src/cocoa_window.m \
    glfw/src/glfw3.pc.in \
    glfw/src/glfw3Config.cmake.in \
    glfw/src/glfw_config.h.in \
    glfw/src/mappings.h.in \
    glfw/src/nsgl_context.m

HEADERS += \
    glfw/deps/getopt.h \
    glfw/deps/glad/gl.h \
    glfw/deps/glad/khrplatform.h \
    glfw/deps/glad/vk_platform.h \
    glfw/deps/glad/vulkan.h \
    glfw/deps/linmath.h \
    glfw/deps/mingw/_mingw_dxhelper.h \
    glfw/deps/mingw/dinput.h \
    glfw/deps/mingw/xinput.h \
    glfw/deps/nuklear.h \
    glfw/deps/nuklear_glfw_gl2.h \
    glfw/deps/stb_image_write.h \
    glfw/deps/tinycthread.h \
    glfw/deps/vs2008/stdint.h \
    glfw/include/GLFW/glfw3.h \
    glfw/include/GLFW/glfw3native.h \
    glfw/src/cocoa_joystick.h \
    glfw/src/cocoa_platform.h \
    glfw/src/egl_context.h \
    glfw/src/glx_context.h \
    glfw/src/internal.h \
    glfw/src/linux_joystick.h \
    glfw/src/mappings.h \
    glfw/src/nsgl_context.h \
    glfw/src/null_joystick.h \
    glfw/src/null_platform.h \
    glfw/src/osmesa_context.h \
    glfw/src/posix_thread.h \
    glfw/src/posix_time.h \
    glfw/src/wgl_context.h \
    glfw/src/win32_joystick.h \
    glfw/src/win32_platform.h \
    glfw/src/wl_platform.h \
    glfw/src/x11_platform.h \
    glfw/src/xkb_unicode.h

The Qt recognize the function so everything is good. I click on rebuilt all projects

But when I try to built the program I get the following error:

And when I push the run button I get the a loads of errors

I use the code from link here.

SGaist

GLFW already provides a mean to build their library. Use it.

bence

@SGaist

And who to built it. I just find the way to use it in VS.

SGaist

Please, read the documentation of the libraries you want to use. It's explained right in their website.

bence

@SGaist

just another think link somebody says

LIBS += -LC:\Qt\5.13.0\mingw73_64\lib\libQt5OpenGL.a -lopengl64

It should work but it does not work for me

bence

@SGaist

Other thing is that at glfw\lib-mingw-w64 there is 3 files

glfw3.dll
libglfw3.a
libglfw3dll.a

these are libarys so I assume that I could include that so right click add external libary I add: libglfw3.a

.pro file

TEMPLATE = app
CONFIG += console c++11
CONFIG -= app_bundle
CONFIG -= qt

SOURCES += main.cpp


INCLUDEPATH += C:\glfw\include

win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../../../../glfw/lib-mingw-w64/ -lglfw3
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../../../../glfw/lib-mingw-w64/ -lglfw3d
else:unix: LIBS += -L$$PWD/../../../../glfw/lib-mingw-w64/ -lglfw3

INCLUDEPATH += $$PWD/../../../../glfw/lib-mingw-w64
DEPENDPATH += $$PWD/../../../../glfw/lib-mingw-w64

So it looks good but when I try to build the program I get errors

:-1: error: cannot find -lglfw3d
:-1: error: collect2.exe: error: ld returned 1 exit status