I desperately need access to some of fltk's native handles so that I may fashion proper cooperation between fltk and various other libraries that I am using.
I am attempting to initialize the handles I need myself in the manner that is described in the documentation here: http://www.fltk.org/doc-1.3/index.html ----------- Quote ---------- "Changing the Display, Screen, or X Visual FLTK uses only a single display, screen, X visual, and X colormap. This greatly simplifies its internal structure and makes it much smaller and faster. You can change which it uses by setting global variables before the first Fl_Window::show() is called. You may also want to call Fl::visual(), which is a portable interface to get a full color and/or double buffered visual." ----------------------------- In the constructor of my display window I attempt to initialize the display, screen, visual and colormap. I normally do this before any windows are shown and only once. However, the code below doesn't do this and only provides a means to reproduce the following error which is causing much wailing and gnashing of teeth: ----------- Error ---------- X Error of failed request: BadAtom (invalid Atom parameter) Major opcode of failed request: 18 (X_ChangeProperty) Atom id in failed request: 0x0 Serial number of failed request: 21 Current serial number in output stream: 32 Press [Enter] to close the terminal ... ----------------------------- ----------- Code ---------- #include <fltk/run.h> #include <fltk/GlWindow.h> #include <iostream> #include <string> #include <GL/glx.h> #define XWindow ::Window # include <fltk/x.h> // #define GLX_CONTEXT_MAJOR_VERSION_ARB 0x2091 #define GLX_CONTEXT_MINOR_VERSION_ARB 0x2092 typedef GLXContext (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, Bool, const int*); void Terminate(const std::string &message) { throw message; }; struct OglDisplayWindow : public fltk::GlWindow { OglDisplayWindow( int X, int Y, int W, int H, const char *L); virtual ~OglDisplayWindow(); virtual void draw(); virtual int handle(int); typedef GLXContext OGLCONTEXT; private: static Display *_disp_ptr; static XVisualInfo *_vis_ptr; static GLXFBConfig *_fbconfig_ptr; static int _fbconfigID; static int _screenID; static Colormap _colorMap; }; Display* OglDisplayWindow::_disp_ptr = 0; XVisualInfo* OglDisplayWindow::_vis_ptr = 0; GLXFBConfig* OglDisplayWindow::_fbconfig_ptr = 0; int OglDisplayWindow::_fbconfigID = 0; int OglDisplayWindow::_screenID = 0; Colormap OglDisplayWindow::_colorMap = Colormap(); OglDisplayWindow::OglDisplayWindow( int X, int Y, int W, int H, const char *L) : fltk::GlWindow(X,Y,W,H,L) { struct Utility { static void InitOsNativeResources() { //Interacting with the X library ////////////////////////////////////////////////////////////////////////// _disp_ptr = XOpenDisplay(0); if (!_disp_ptr) { Terminate("OglDisplayWindow::draw - Failed to open X display.\n"); }//end if _screenID = DefaultScreen(_disp_ptr); // Get a matching FB config static int visual_attribs[] = { GLX_X_RENDERABLE,True, GLX_DRAWABLE_TYPE,GLX_WINDOW_BIT, GLX_RENDER_TYPE,GLX_RGBA_BIT, GLX_X_VISUAL_TYPE,GLX_TRUE_COLOR, GLX_RED_SIZE,8, GLX_GREEN_SIZE,8, GLX_BLUE_SIZE,8, GLX_ALPHA_SIZE,8, GLX_DEPTH_SIZE,24, GLX_STENCIL_SIZE,8, GLX_DOUBLEBUFFER,True, //GLX_SAMPLE_BUFFERS , 1, //GLX_SAMPLES , 4, None }; //Getting matching framebuffer configs int fbcount; _fbconfig_ptr = glXChooseFBConfig( _disp_ptr, _screenID, visual_attribs, &fbcount); if (!_fbconfig_ptr) { Terminate("OglDisplayWindow::draw - Failed to retrieve a framebuffer config.\n"); }//end if //"Found matching FB configs // Pick the FB config/visual with the most samples per pixel //Getting XVisualInfo int best_fbc = -1; int worst_fbc = -1; int best_num_samp = -1; int worst_num_samp = 999; int samp_buf; int samples; for (int i(0);i < fbcount;++i) { _vis_ptr = glXGetVisualFromFBConfig( _disp_ptr, _fbconfig_ptr[i]); if (_vis_ptr) { samp_buf = 0; samples = 0; glXGetFBConfigAttrib( _disp_ptr, _fbconfig_ptr[i], GLX_SAMPLE_BUFFERS, &samp_buf); glXGetFBConfigAttrib( _disp_ptr, _fbconfig_ptr[i], GLX_SAMPLES, &samples); if ((best_fbc < 0 || samp_buf) && samples > best_num_samp) { best_fbc = i; best_num_samp = samples; }//end if if (worst_fbc < 0 || !samp_buf || samples < worst_num_samp) { worst_fbc = i; worst_num_samp = samples; }//end if }//end if XFree(_vis_ptr); }//end for //Use the best matching visual _fbconfigID = best_fbc; _vis_ptr = glXGetVisualFromFBConfig( _disp_ptr, _fbconfig_ptr[_fbconfigID]); //Creating colormap _colorMap = XCreateColormap( _disp_ptr, RootWindow(_disp_ptr,_vis_ptr->screen), _vis_ptr->visual, AllocNone); //Interacting with FLTK library ////////////////////////////////////////////////////////////////////////// fltk::xdisplay = _disp_ptr; fltk::xscreen = _screenID; fltk::xvisual = _vis_ptr; fltk::xcolormap = _colorMap; std::cout<<"Os handles initialized."<<std::endl; }//end function }; Utility::InitOsNativeResources(); }//end function OglDisplayWindow::~OglDisplayWindow() { XFree(_fbconfig_ptr); //I am assuming fltk will free the other resources after I pass them to the library...wrong? }//end function void OglDisplayWindow::draw() { if (!this->valid()) { this->make_current(); }//end if }//end function int OglDisplayWindow::handle(int msg) { return fltk::GlWindow::handle(msg); }//end function int main(void) { try { OglDisplayWindow displayWin( 100, 100, 100, 100, "Debug Code"); displayWin.show(); while (displayWin.visible()) { fltk::check(); displayWin.flush(); }//end while } catch (const std::string &message) { std::cerr << message << std::endl; }//end try }//end function _______________________________________________ fltk mailing list [email protected] http://lists.easysw.com/mailman/listinfo/fltk
