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Posted 30 Oct 2010
Licenced CPOL

Writing a Platform and GUI Toolkit Independent OpenGL Class

, 1 Nov 2010
Article showing how to write OS and GUI toolkit portable OpenGL view class
basecode
linux
MultiGL
GLView
GLViewGTKApp
.project
AUTHORS
autom4te.cache
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traces.0
ChangeLog
config.guess
config.h.in
config.sub
configure
configure.in
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glviewgtkapp.gladep
INSTALL
install-sh
Makefile.am
Makefile.in
missing
mkinstalldirs
NEWS
po
ChangeLog
Makefile.in.in
POTFILES.in
README
src
Makefile.am
Makefile.in
stamp-h.in
GLViewMotifApp
.project
autom4te.cache
output.0
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traces.0
config.h.in
configure
configure.ac
depcomp
install-sh
Makefile.am
Makefile.in
missing
src
Makefile.am
Makefile.in
GLViewQtApp
.project
GLViewQtApp.ico
GLViewQtApp.pro.user
glviewqtapp.qrc
Makefile
Resources
.project
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config.guess
config.h.in
config.sub
configure
configure.ac
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m4
Makefile.am
Makefile.in
missing
src
Makefile.am
Makefile.in
win32
MultiGL
GLView
GLViewGTKApp
AUTHORS
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configure.in
devcpp
glviewgtkapp.dev
glviewgtkapp.gladep
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msvc
glviewgtkapp.suo
glviewgtkapp.vcproj
NEWS
po
ChangeLog
POTFILES.in
README
src
Makefile.am
stamp-h.in
GLViewMFCDlgApp
GLViewMFCDlgApp.aps
GLViewMFCDlgApp.vcproj
res
GLViewMFCDlgApp.ico
GLViewMFCMDIApp
GLViewMFCMDIApp.vcproj
res
buttons.bmp
filelarge.bmp
filesmall.bmp
GLViewMFCMDIApp.ico
GLViewMFCMDIAppDoc.ico
main.bmp
Toolbar.bmp
Toolbar256.bmp
writelarge.bmp
writesmall.bmp
GLViewQtApp
GLViewQtApp
GLViewQtApp.ico
glviewqtapp.qrc
GLViewQtApp.vcproj
Makefile
moc_glviewqtapp.o
Resources
GLView.cpp.bak
GLView.suo
GLView.vcproj
MultiGL.suo
#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include <gtk/gtk.h>

#include "callbacks.h"
#include "interface.h"
#include "support.h"

#include <GLView.h>

static CGLView *pGLView = NULL;

void
UpdateDrawingArea (GtkWidget * widget)
{
  GtkWidget *drw = lookup_widget (GTK_WIDGET (widget), "drawingarea1");
  gdk_window_invalidate_rect (GTK_WIDGET (drw)->window,
			      &GTK_WIDGET (drw)->allocation, FALSE);
}

void
on_new1_activate (GtkMenuItem * menuitem, gpointer user_data)
{

}


void
on_open1_activate (GtkMenuItem * menuitem, gpointer user_data)
{

}


void
on_save1_activate (GtkMenuItem * menuitem, gpointer user_data)
{

}


void
on_save_as1_activate (GtkMenuItem * menuitem, gpointer user_data)
{

}


void
on_quit1_activate (GtkMenuItem * menuitem, gpointer user_data)
{
  if (pGLView)
    {
      delete pGLView;
      pGLView = NULL;
    }
  gtk_main_quit ();
}


void
on_cut1_activate (GtkMenuItem * menuitem, gpointer user_data)
{

}


void
on_copy1_activate (GtkMenuItem * menuitem, gpointer user_data)
{

}


void
on_paste1_activate (GtkMenuItem * menuitem, gpointer user_data)
{

}


void
on_delete1_activate (GtkMenuItem * menuitem, gpointer user_data)
{

}


void
on_about1_activate (GtkMenuItem * menuitem, gpointer user_data)
{

}

#ifdef WIN32
#include <gdk/gdkwin32.h>
#else
#include <gdk/gdkx.h>
#endif
void
on_drawingarea1_realize (GtkWidget * widget, gpointer user_data)
{

  // Unset Double Buffering on DrawingArea to 
  // eliminate flickering of glview
  GTK_WIDGET_UNSET_FLAGS (widget, GTK_DOUBLE_BUFFERED);
  pGLView = new CGLView ();
  if (pGLView)
    {
      GdkWindow *gdkwin = GTK_WIDGET (widget)->window;
	  
#ifdef WIN32
	  glong hWnd;
      hWnd = (glong) gdk_win32_drawable_get_handle (gdkwin);	// get HWND
	  pGLView->SetWindow ((HWND) hWnd);
#else
	  Display* pDisplay = gdk_x11_drawable_get_xdisplay(gdkwin);
	  Window window = (Window) gdk_x11_drawable_get_xid(gdkwin);
	  pGLView->SetWindow (pDisplay, window);
#endif

     
      pGLView->SetupGLContext (TRUE);
      gint w, h;
      gtk_widget_get_size_request (widget, &w, &h);
      pGLView->Resize (w, h);
    }
}


gboolean
on_drawingarea1_configure_event (GtkWidget * widget,
				 GdkEventConfigure * event,
				 gpointer user_data)
{
  if (pGLView)
    {
      pGLView->Resize (event->width, event->height);
    }
  return FALSE;
}


gboolean
on_drawingarea1_expose_event (GtkWidget * widget,
			      GdkEventExpose * event, gpointer user_data)
{
  if (pGLView)
    {
      pGLView->RenderScene ();
      UpdateDrawingArea (GTK_WIDGET (widget));
    }
  return FALSE;
}

void
on_MainWindow_realize (GtkWidget * widget, gpointer user_data)
{
  gtk_widget_set_size_request (widget, 800, 600);
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Sharjith
Product Manager Mahindra & Mahindra
India India
Sharjith is a Mechanical Engineer with strong passion for Automobiles, Aircrafts and Software development.

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