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tenspd137
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Joined: 22 Aug 2006
Posts: 391

PostPosted: Wed Sep 19, 2012 4:11 am    Post subject: C++ compilation problem [SOLVED!!! - stupid typos] Reply with quote

Hi all,

I was trying to compile some files using C++0x. From what I can tell the following files should compile with:
g++ -std=c++0x -c GLWindowX11.cpp

interfaces.hpp:
Code:

#ifndef _INTERFACES_HPP_
#define _INTERFACES_HPP_

#include <memory>

using std::shared_ptr;
using std::weak_ptr;


class IWindow
{
  public:
    virtual ~IWindow() {}
    virtual bool CreateWindow(int width, int height, int bpp, bool fullscreen) = 0;
    virtual void DestroyWindow() = 0;
    virtual void SwapBuffers() = 0;
    virtual Display* GetDisplay() = 0;
};

#endif


GLXWindow.hpp
Code:

#ifndef _GLWINDOWX11_HPP
#define _GLWINDOWX11_HPP

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/xf86vmode.h>
#include <GL/gl.h>
#include <GL/glx.h>
//don't know if we needd these for extensions...
//#include <GL/glext.h>
//#include <GL/glxext.h>
#include <ctime>

#include "interfaces.hpp"


class GLWindowX11 : public IWindow
{
  public:
    virtual ~GLWindowX11();
    GLWindowX11();
    virtual bool CreateWindow(int width, int height, int bpp, bool fullscreen);
    virtual void DestroyWindow();
    virtual void SwapBuffers() { glXSwapBuffers(m_display, m_XWindow); }
    Display* GetDisplay() { return m_display; );

  private:
    Display* m_display;
    Window m_XWindow;
    GLXContext m_glContext;
    XF86VidModeModeInfo m_XF86DeskMode;
    XSetWindowAttributes m_XSetAttr;
    int m_screenID;

    bool m_idFullscreen;
    unsigned int m_width;
    unsigned int m_height;
    unsigned int m_bpp;

    bool m_GL3Supported;

};


#endif


GLXWindowX11.cpp
Code:

#include <iostream>
#include <string>
#include <ctime>
#include <memory>
#include "GLWindowX11.hpp"

using std::string;

typedef GLXContext ( * PFNGLXCREATECONTEXTATTRIBSARBPROC) (Display *dpy, GLXFBConfig config, GLXContext share_context, bool direct, const int *attrib_list);

GLWindowX11():
    m_display(NULL),
    m_XWindow(0),
    m_glContext(0),
    m_screenID(0),
    m_isFullscreen(false),
    m_width(0),
    m_height(0),
    m_bpp(0),
    m_GL3Supported(false)
{
}

~GLWindowX11()
{
}

bool GLWindowX11::CreateWindow(int width, int height, int bpp, bool fullscreen)
{
    m_display = XOpenDisplay(0);
    if (m_display == NULL)
    {
   std::cerr << "Could not open the display" << std::endl;
   return false;
    }
   
    m_screenID = DefaultScreen(m_display);
    int n = 0, modeNum = 0;
   
    //Get a framebuffer config using default attributes
    GLXFBConfig framebufferConfig = (*glxChooseFBConfig(m_display, m_screenID, 0, &n));
    XF86VidModeModeInfo **modes;

    if (!XF86VidModeGetAllModeLines(m_display, m_screenID, &modeNum, &modes))
    {
   std::cerr << "Could not query the video modes..." << std::endl;
   return false;
    }

    m_XF86DeskMode = *modes[0];
    int bestMode = -1;
    for(int i = 0; i<modeNum, i++)
    {
   if((modes[i]->hdisplay == width) && (modes[i]->vdisplay == height))
   {
       bestMode = i;
   }
    }

    if (bestMode == -1)
    {
   std::cerr << "Could not find a suitable graphics mode" << std::endl;
   return false;
    }

    int doubleBufferedAttribList [] = {
   GLX_RGBA, GLX_DOUBLEBUFFER,
   GLX_RED_SIZE, 4,
   GLX_GREEN_SIZE, 4,
   GLX_BLUE_SIZE, 4,
   GLX_DEPTH_SIZE, 16,
   None
    };

    XVisualInfo* vi = NULL;
    //Attempt to create a double buffered window
    vi = glXChooseVisual(m_display, m_screenID, doubleBufferedAttribList);

    if(vi == NULL)
    {
   std::cerr << "Could not create a double buffered window..." << std::endl;
   return false;
    }

    //Create a GL 2.1 context
    GLXContext gl2context = glXCreateContext(m_display, vi, 0, GL_TRUE);
   
    if (gl2context == NULL)
    {
   std::cerr << "Could not create a GL 2.1 context - please check your graphics drivers..." << std::endl;
   return false;
    }

    //Get pointer to GL 3.0+ context
    PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribs = (PFNGLXCREATECONTEXTATTRIBSARBPROC)glXGetProcAddress((GLubyte*)"glXCreateContextAttribsARB");

    if(glXCreateContextAttribs == NULL)
    {
   std::cerr << "OpenGL 3 not supported." << std::endl;
   m_GL3Supported = false;
    }
    else
    {
   //Create the 3.0 context
   int attribs[] = {
       GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
       GLX_CONTEXT_MINOR_VERSION_ARB, 0,
       0 //end of array
   };
   
   m_glContext = glXCreateContextAttribs(m_display, frambufferConfig, 0, true, &attribs[0]);
   glXDestroyContext(m_display, gl2Context);
   m_GL3Supported = true;
    }

    Colormap cmap = XCreateColormap(m_display, RootWindow(m_display, vi->screen), vi->visual,AllocNone);
    m_XSetAttr.colormap = cmap;
    m_XSetAttr.bordr_pixel = 0;
    m_XSetAttr.event_mask = ExposureMask | KeyPressMask | KeyReleaseMask | ButtonPressMask | StructureNotifyMask;
    m_XSetAttr.override_redirect = False;
   
    unsigned long windowAttributes = CWBorderPixel | CWColormap | CWEventMask;

    if(fullscreen)
    {
   windowAttributes = CWBorderPixel | CWColormap | CWEventMask | CWOverrideRedirect;
   
   XF86VidModeSwitchToMode(m_display, m_screenID, modes[bestMode]);
   XF86VidModeSetViewPort(m_display, m_screenID, 0, 0);
   m_XSetAttr.override_redirect = True;
    }

    m_XWindow = XCreateWindow(m_display, RootWindow(m_display, vi->screen),
               0, 0, width, height, 0, vi->depth, InputOutput, vi->visual,
               CWBorderPixel | CWColorMap | CWEventMask, &m_XSetAttr);

    std::string title = "test";

    if (fullscreen)
    {
        XWarpPointer(m_display, None, m_XWindow, 0, 0, 0, 0, 0, 0);
        XMapRaised(m_display, m_XWindow);
        XGrabKeyboard(m_display, m_XWindow, True, GrabModeAsync, GrabModeAsync, CurrentTime);
        XGrabPointer(m_display, m_XWindow, True, ButtonPressMask,
                     GrabModeAsync, GrabModeAsync, m_XWindow, None, CurrentTime);

        m_isFullscreen = true;
    }
    else
    {
        Atom wmDelete = XInternAtom(m_display, "WM_DELETE_WINDOW", True);
        XSetWMProtocols(m_display, m_XWindow, &wmDelete, 1);
        XSetStandardProperties(m_display, m_XWindow, title.c_str(), None, NULL, NULL, 0, NULL);
        XMapRaised(m_display, m_XWindow);
    }

    XFree(modes);

    glXMakeCurrent(m_display, m_XWindow, m_glContext);

    int posx = 0;
    int posy = 0;

    Window winDummy;
    unsigned int borderDummy;
   
    m_width = (unsigned) width;
    m_height = (unsigned) height;
    m_bpp = (unsigned) bpp;

    XGetGeometry(m_display, m_XWindow, &winDummy, &posx, &posy, &m_width, &m_height, &borderDummy, &m_bpp);

    return true;
}

void GLWindowX11::DestroyWindow()
{
    if (m_glContext)
    {
   glXMakeCurrent(m_display, None, NULL);
   glXDestroyContext(m_displayt, m_glContext);
   m_glContext = NULL;
    }

    if (m_isFullScreen)
    {
   XF86VidModeSwitchToMode(m_display, m_screenID, &m_XF86DeskMode);
   XF86VidModeSetViewPort(m_display, m_screenID, 0, 0);
    }

    XCloseDisplay(m_display);
}



When I try to compile these, I get the following error:
GLWindowX11.cpp:8:12: error: using-declaration for non-member at class scope
....many more errors.....



If I remove the using std::string; line,
GLWindowX11.cpp:12:1: error: ‘GLWindowX11::GLWindowX11()’ cannot be overloaded

I don't think I have defined classes incorectly, so I don't know what I am missing....

Also, in my .cpp file, if I use GLXWindowX11::GLXWindowX11(): ......., it complains about an extra qualification. this would make sense if it were in the function or header, but form everything I can see, this should be correct also.

Any hints would be appreciated - this is really bothering me *sigh*


Last edited by tenspd137 on Wed Sep 19, 2012 8:01 am; edited 1 time in total
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schorsch_76
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Joined: 19 Jun 2012
Posts: 450

PostPosted: Wed Sep 19, 2012 5:29 am    Post subject: Reply with quote

Could you please mark the line "12" in your cpp file...
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aderesch
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Joined: 06 Mar 2010
Posts: 123
Location: Hamburg, Germany

PostPosted: Wed Sep 19, 2012 5:56 am    Post subject: Re: C++ compilation problem Reply with quote

tenspd137 wrote:

When I try to compile these, I get the following error:
GLWindowX11.cpp:8:12: error: using-declaration for non-member at class scope
....many more errors.....

Well, this pretty much tells you the compiler believes it is still inside a class definition instead of at global scope. Check for correct braces/parentheses/semicolons.
Also, constructor and destructor need a GLXWindowX11::. Your error message about this is also due to wrong scoping.

Although probably irrelevant right now, you should include the necessary X11 headers for Display in interfaces.hpp.

ad
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^marcs
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Joined: 09 Mar 2005
Posts: 169

PostPosted: Wed Sep 19, 2012 6:23 am    Post subject: Reply with quote

Constructor should be defined this way in .cpp
Code:
GLWindowX11::GLWindowX11():
    m_display(NULL),
    m_XWindow(0),
    m_glContext(0),
    m_screenID(0),
    m_isFullscreen(false),
    m_width(0),
    m_height(0),
    m_bpp(0),
    m_GL3Supported(false)
{
}

error he is issuing about scoping is a result of something else.

Code:
    Display* GetDisplay() { return m_display; );

is a main bugger here, correct the bracers around return m_display and that should throw You way ahead.

also, You have
Code:
 bool m_idFullscreen;

in declaration but
Code:
m_isFullscreen(false),

in constructor list.

There is more after that, but You should figure it out.
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tenspd137
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Joined: 22 Aug 2006
Posts: 391

PostPosted: Wed Sep 19, 2012 8:01 am    Post subject: Reply with quote

GAHHHHH! Stupid typos and small screen font!

Thank you to everyone who looked at this for me. It was one of those cases where I was reading what I wanted to instead of what was there - you know, when you have looked at the same thing 100 times, so you need someone else to point out your stupidly obvious error.... Thanks for being a fresh set of eyes - much appreciated!

Once I cleaned up these:
Code:

 Display* GetDisplay() { return m_display; );
......
 bool m_idFullscreen;


all my other typos came out as error messages I would expect and I cleaned it all up to compile with no probs.

Also, thank you for confirming that I was indeed writing my constructor and destructor correctly when I qualified them in my .cpp file with GLXWindowX11:: - I was trying to appease the compiler to see if it would move forward because I kept missing the brace above.

I was just up too late trying to do this and missing the obvious.

I think I can actually get to sleep now - I won't be up trying to do this over and over in my head.

Thanks again!!!! :)
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