CEGUI (Crazy Eddie's GUI) Forums

Posted: **Wed Jan 17, 2018 03:02**

Hello,

I'm attempting to use the Old desktop OpenGL 1.2 (Fixed Function) version of CEGUI. I'm building with plain old

cmake ..
make 
make install

Does building for OpenGL 1.2 require any special options?

The Desktop OpenGL 3.2 or OpenGL ES 2.0 version required some additional options during the build

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cmake .. -DCEGUI_BUILD_RENDERER_OPENGL=OFF -DCEGUI_BUILD_RENDERER_OPENGL3=ON -DCEGUI_USE_EPOXY=ON -DCEGUI_USE_GLEW=OFF
make
make install

The reason why I ask is that when I attempt to compile code using it I get the following

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In file included from /usr/local/include/cegui-0/CEGUI/RendererModules/OpenGL/GL.h:38:0,
                 from /usr/local/include/cegui-0/CEGUI/RendererModules/OpenGL/RendererBase.h:37,
                 from /usr/local/include/cegui-0/CEGUI/RendererModules/OpenGL/GL3Renderer.h:30,
                 from /home/jay/projects/game3d/src/../headers/main.hpp:6,
                 from /home/jay/projects/game3d/src/main.cpp:1:
/usr/include/GL/glew.h:85:2: error: #error gl.h included before glew.h

I figure I must be missing some step in my build. To trouble shoot, I went around including glew.h manually, but i could tell that was going to be disastrous. So, my assumption is that I did something wrong and the first suspect is my build.

Thank you,
Jay

Posted: **Wed Jan 17, 2018 03:51**

I tried it with these options but I got the same results.

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# cmake .. -DCEGUI_BUILD_RENDERER_OPENGL=ON -DCEGUI_BUILD_RENDERER_OPENGL3=OFF -DCEGUI_USE_EPOXY=OFF -DCEGUI_USE_GLEW=ON
# make
# make install

Posted: **Wed Jan 17, 2018 04:11**

Version?

Posted: **Wed Jan 17, 2018 04:14**

You might have included a CEGUI header AFTER you included gl.h.

Suggested order for including headers of dependencies, internal project files, and std files is:

First the header matching the cpp
Then the local project files
Then the dependencies (first the higher level ones like CEGUI, then the specific ones that are more atomic like glm, glew, etc)
Then the std files

Posted: **Wed Jan 17, 2018 04:53**

Thank you for you assistance. I really appreciate it.

I made a few changes. I think that I'm doing what you are directing, but I am probably not.

Error:

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In file included from /usr/local/include/cegui-0/CEGUI/RendererModules/OpenGL/GL.h:38:0,
                 from /usr/local/include/cegui-0/CEGUI/RendererModules/OpenGL/RendererBase.h:37,
                 from /usr/local/include/cegui-0/CEGUI/RendererModules/OpenGL/GLRenderer.h:31,
                 from /home/jay/projects/game3d/src/../headers/../headers/../headers/../headers/client_cegui_drawable.hpp:7,
                 from /home/jay/projects/game3d/src/../headers/../headers/../headers/event_handler_cegui.hpp:4,
                 from /home/jay/projects/game3d/src/../headers/../headers/client_master.hpp:4,
                 from /home/jay/projects/game3d/src/../headers/main.hpp:4,
                 from /home/jay/projects/game3d/src/main.cpp:1:
/usr/include/GL/glew.h:85:2: error: #error gl.h included before glew.h
 #error gl.h included before glew.h

main.cpp

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#include "../headers/main.hpp"


int main() {
    ServerMaster sm;
    ClientMaster cm;

    sm.start();
    cm.start( &sm );

    while( sm.get_playing() ) {
        sm.update();
        cm.input();
        cm.render();
        cm.update_terrain();
    }

    sm.stop();

    return 0;
}

main.hpp

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#ifndef MAIN_H
#define MAIN_H

#include "../headers/client_master.hpp"
#include "../headers/server_master.hpp"


#endif

client_master.hpp

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#ifndef CLIENT_MASTER_H
#define CLIENT_MASTER_H

#include "../headers/event_handler_cegui.hpp"
...
#include <stuff>
#include <more stuff>
...
#include <iostream>
#include <string>
#include <sstream>
#include <map>
#include <tuple>

class ClientMaster{ ... };

#endif

event_handler_cegui.hpp

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#ifndef EVENT_HANDLER_CEGUI_H
#define EVENT_HANDLER_CEGUI_H

#include "../headers/client_cegui_drawable.hpp"

#include <stuff>

class EventHandlerCEGUI : public osgGA::GUIEventHandler { ... };

#endif

client_cegui_drawable.hpp

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#ifndef CLIENT_CEGUI_DRAWABLE_H
#define CLIENT_CEGUI_DRAWABLE_H

#include <epoxy/gl.h>
#include <CEGUI.h>
#include <RendererModules/OpenGL/GLRenderer.h>
#include <osg/Drawable>
#include <iostream>
#include <string>

class ClientCEGUIDrawable : public osg::Drawable { ... };

#endif

Posted: **Wed Jan 17, 2018 04:57**

Version info:
OS: Fedora Release 26
Compiler: g++ (GCC) 7.2.1
CEGUI: 0.8.7
OpenGL: 3.0 Mesa 17.2.4

Posted: **Thu Jan 18, 2018 02:55**

Thank you. A good night's rest and fresh eyes were what I needed to find the problem. You were correct and the issue error is resolved. Thank you again.

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