Qt + Ogre3D. I cannot build a very simple example

[8Observer8]

My goal now is to check can Ogre works with Qt for static or not. If it cannot I will continue usage of OpenGL, and I will not spend my time for Ogre. And I want to check can I integrate Ogre inside of Qt Widget for static build.

This message Target "BootstrapCMakeQt5Cpp" links to target "ZLIB::ZLIB" but the target was not found. says that I should to add ZLIB::ZLIB here:

target_link_libraries(BootstrapCMakeQt5Cpp PRIVATE Qt${QT_VERSION_MAJOR}::Widgets OgreBitesQt OgreRTShaderSystem ZLIB::ZLIB)

But before it I should to add this line: find_package(ZLIB). Ogre already has zlib. But it does not work again:

find_package(ZLIB)

find_package(OGRE REQUIRED COMPONENTS Bites RTShaderSystem CONFIG)
target_link_libraries(BootstrapCMakeQt5Cpp PRIVATE Qt${QT_VERSION_MAJOR}::Widgets OgreBitesQt OgreRTShaderSystem ZLIB::ZLIB)

It says again:

CMake Error at CMakeLists.txt:44 (add_executable):
  Target "BootstrapCMakeQt5Cpp" links to target "ZLIB::ZLIB" but the target
  was not found.  Perhaps a find_package() call is missing for an IMPORTED
  target, or an ALIAS target is missing?

[8Observer8]

I solved the problems with SDL2 and ZLIB that was in the message above. Now configuration is passing. But when I build it i see the same errors like in the first post with qmake:

CMakeLists.txt

cmake_minimum_required(VERSION 3.5)

project(BootstrapCMakeQt5Cpp LANGUAGES CXX)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
link_directories("E:/ProgramFiles/ogre-13.1.1/lib")

find_package(QT NAMES Qt6 Qt5 COMPONENTS Widgets REQUIRED)
find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Widgets REQUIRED)

set(PROJECT_SOURCES
        main.cpp
)

if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
    qt_add_executable(BootstrapCMakeQt5Cpp
        ${PROJECT_SOURCES}
    )
else()
    if(ANDROID)
        add_library(BootstrapCMakeQt5Cpp SHARED
            ${PROJECT_SOURCES}
        )
    else()
        add_executable(BootstrapCMakeQt5Cpp
            ${PROJECT_SOURCES}
        )
    endif()
endif()

#find_package(ZLIB REQUIRED)
add_library(ZLIB::ZLIB INTERFACE IMPORTED)
add_library(SDL2::SDL2 INTERFACE IMPORTED)
find_package(OGRE REQUIRED COMPONENTS Bites RTShaderSystem CONFIG)

target_link_libraries(BootstrapCMakeQt5Cpp PRIVATE Qt${QT_VERSION_MAJOR}::Widgets OgreBitesQt OgreRTShaderSystem)

main.cpp

#include "Ogre.h"
#include "OgreApplicationContextQt.h"
#include <QGuiApplication>

class MyTestApp : public OgreBites::ApplicationContextQt, public OgreBites::InputListener
{
public:
    MyTestApp();
    void setup();
    bool keyPressed(const OgreBites::KeyboardEvent& evt);
};

MyTestApp::MyTestApp() : OgreBites::ApplicationContextQt("OgreTutorialApp")
{
}

bool MyTestApp::keyPressed(const OgreBites::KeyboardEvent& evt)
{
    if (evt.keysym.sym == OgreBites::SDLK_ESCAPE)
    {
        getRoot()->queueEndRendering();
    }
    return true;
}

void MyTestApp::setup(void)
{
    // do not forget to call the base first
    OgreBites::ApplicationContextQt::setup();
}

int main(int argc, char *argv[])
{
    QGuiApplication qapp(argc, argv);
    MyTestApp app;
    app.initApp();
    app.getRoot()->startRendering();
    app.closeApp();
    return qapp.exec();
}

[8Observer8]

I added OgreApplicationContextQt.cpp directly in my code:

I added Q_OBJECT to MyTestApp.h. I have a little different errors:

These are all my files:

MyTestApp.h

#ifndef MYTESTAPP_H
#define MYTESTAPP_H

#include "Ogre.h"
#include "OgreApplicationContextQt.h"
#include <QtCore/QObject>

class MyTestApp : public OgreBites::ApplicationContextQt, public OgreBites::InputListener
{
    Q_OBJECT
public:
    MyTestApp();
    virtual ~MyTestApp() { }
    void setup();
    bool keyPressed(const OgreBites::KeyboardEvent& evt);
};

#endif // MYTESTAPP_H

MyTestApp.cpp

#include "MyTestApp.h"

MyTestApp::MyTestApp() : OgreBites::ApplicationContextQt("OgreTutorialApp")
{
}

bool MyTestApp::keyPressed(const OgreBites::KeyboardEvent& evt)
{
    if (evt.keysym.sym == OgreBites::SDLK_ESCAPE)
    {
        getRoot()->queueEndRendering();
    }
    return true;
}

void MyTestApp::setup(void)
{
    // do not forget to call the base first
    OgreBites::ApplicationContextQt::setup();

}

main.cpp

#include <QGuiApplication>
#include "MyTestApp.h"

int main(int argc, char *argv[])
{
    QGuiApplication qapp(argc, argv);
    MyTestApp app;
    app.initApp();
    app.getRoot()->startRendering();
    app.closeApp();
    return qapp.exec();
}

.pro

QT       += core gui

INCLUDEPATH += "E:\ProgramFiles\ogre-13.1.1\include\OGRE"
INCLUDEPATH += "E:\ProgramFiles\ogre-13.1.1\include\OGRE\Bites"
INCLUDEPATH += "E:\ProgramFiles\ogre-13.1.1\include\OGRE\RTShaderSystem"

LIBS += -L"E:\ProgramFiles\ogre-13.1.1\lib"
LIBS += -L"E:\ProgramFiles\ogre-13.1.1\lib\OGRE"

#LIBS += -lOgreBitesQtStatic
# -lOgreMeshLodGeneratorStatic
# -lOgrePagingStatic
# -lOgrePropertyStatic
LIBS += -lOgreBitesStatic -lRenderSystem_GL3PlusStatic -lOgreGLSupportStatic -lOgreOverlayStatic   -lOgreRTShaderSystemStatic -lOgreVolumeStatic -lPlugin_BSPSceneManagerStatic -lPlugin_DotSceneStatic -lPlugin_OctreeSceneManagerStatic -lPlugin_OctreeZoneStatic -lPlugin_ParticleFXStatic -lPlugin_PCZSceneManagerStatic -lRenderSystem_GLES2Static -lRenderSystem_GLStatic -lOgreMainStatic -lOgreTerrainStatic -lCodec_STBIStatic -lzlibstatic
LIBS += -lSDL2main -lSDL2.dll -lfreetype -lpugixml
LIBS += -lopengl32 -lgdi32

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    MyTestApp.cpp \
    OgreApplicationContextQt.cpp \
    main.cpp

HEADERS += \
    MyTestApp.h

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

[8Observer8]

I try to compile the same very simple and basic example that I tried before with cmake. Сonfiguration with cmake was made without errors:

-- Found OGRE
--   static     : ON
--   components : Bites;MeshLodGenerator;Overlay;Paging;Property;RTShaderSystem;Terrain;Volume
--   plugins    : Plugin_BSPSceneManager;Plugin_OctreeSceneManager;Plugin_PCZSceneManager;Plugin_ParticleFX;RenderSystem_GL;RenderSystem_GLES2;RenderSystem_GL3Plus;Codec_STBI
--   media      : E:/ProgramFiles/ogre-13.1.1/Media
-- Configuring done
-- Generating done
-- Build files have been written to: E:/_Projects/Ogre3D/build-BootstrapCMakeQt5Cpp-Desktop_Qt_5_15_2_MinGW_32_bit-Debug
Elapsed time: 00:01.

But when I build the project I see a few new errors undefined reference to 'compressBound' and undefined reference to 'compress' in OgreSTBICodec.cpp:

I added OgreApplicationContextQt.cpp to the project:

CMakeLists.txt

cmake_minimum_required(VERSION 3.5)

project(BootstrapCMakeQt5Cpp LANGUAGES CXX)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
link_directories("E:/ProgramFiles/ogre-13.1.1/lib")

find_package(QT NAMES Qt6 Qt5 COMPONENTS Widgets REQUIRED)
find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Widgets REQUIRED)

set(PROJECT_SOURCES
        MyTestApp.h
        MyTestApp.cpp
        OgreApplicationContextQt.cpp
        main.cpp
)

if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
    qt_add_executable(BootstrapCMakeQt5Cpp
        ${PROJECT_SOURCES}
    )
else()
    if(ANDROID)
        add_library(BootstrapCMakeQt5Cpp SHARED
            ${PROJECT_SOURCES}
        )
    else()
        add_executable(BootstrapCMakeQt5Cpp
            ${PROJECT_SOURCES}
        )
    endif()
endif()

#find_package(ZLIB REQUIRED)
add_library(ZLIB::ZLIB INTERFACE IMPORTED)
add_library(SDL2::SDL2 INTERFACE IMPORTED)
find_package(OGRE REQUIRED COMPONENTS Bites RTShaderSystem CONFIG)

target_link_libraries(BootstrapCMakeQt5Cpp PRIVATE Qt${QT_VERSION_MAJOR}::Widgets OgreBitesQt OgreRTShaderSystem)

MyTestApp.h

#ifndef MYTESTAPP_H
#define MYTESTAPP_H

#include "Ogre.h"
#include "OgreApplicationContextQt.h"
#include <QtCore/QObject>

class MyTestApp : public OgreBites::ApplicationContextQt, public OgreBites::InputListener
{
    Q_OBJECT
public:
    MyTestApp();
    virtual ~MyTestApp() { }
    void setup();
    bool keyPressed(const OgreBites::KeyboardEvent& evt);
};

#endif // MYTESTAPP_H

MyTestApp.cpp

#include "MyTestApp.h"

MyTestApp::MyTestApp() : OgreBites::ApplicationContextQt("OgreTutorialApp")
{
}

bool MyTestApp::keyPressed(const OgreBites::KeyboardEvent& evt)
{
    if (evt.keysym.sym == OgreBites::SDLK_ESCAPE)
    {
        getRoot()->queueEndRendering();
    }
    return true;
}

void MyTestApp::setup(void)
{
    // do not forget to call the base first
    OgreBites::ApplicationContextQt::setup();

}

main.cpp

#include <QGuiApplication>
#include "MyTestApp.h"

int main(int argc, char *argv[])
{
    QGuiApplication qapp(argc, argv);
    MyTestApp app;
    app.initApp();
    app.getRoot()->startRendering();
    app.closeApp();
    return qapp.exec();
}

[timob256]

this my answer

https://ru.stackoverflow.com/questions/1357826/как-установить-ogre3d-из-исходников-в-линуксе

[8Observer8]

@timob256 but I use Windows

[JoeCFD]

Component Bites is missing. Are you sure you added its lib?

[cpr0gr4mm3r]

I use Ogre 13.6.3 and Qt 5.15.2 MinGW 64-bit and I have the same problem.

Did you get a solution?

[8Observer8]

This post is deleted!

[8Observer8]

This post is deleted!

[8Observer8]

@cpr0gr4mm3r Maybe my next topic will help you: Problems with Ogre in Qt Creator