Using Fl_Plugin feature to automatically draw OpenGL (sub)windows. No extra coding needs to be done. Just call Fl_Printer::print_widget(...). The Fl_Gl_Printer device can (and should) be removed or at least made inaccessible.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7280 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 22 insertions, 0 deletions

diff --git a/src/Fl_Gl_Printer.cxx b/src/Fl_Gl_Printer.cxx
index 233327913..ac1892dde 100644
--- a/src/Fl_Gl_Printer.cxx
+++ b/src/Fl_Gl_Printer.cxx
@@ -89,3 +89,25 @@ void Fl_Gl_Printer::print_gl_window(Fl_Gl_Window *glw, int x, int y)
   free(baseAddress);
 #endif // __APPLE__
 }
+
+/*
+ This class will make sure that OpenGL printing is availbale if fltk_gl
+ was linked to the programm.
+ */
+class Fl_Gl_Device_Plugin : public Fl_Device_Plugin {
+public:
+  Fl_Gl_Device_Plugin() : Fl_Device_Plugin(name()) { }
+  virtual const char *name() { return "opengl.device.fltk.org"; }
+  virtual int print(Fl_Virtual_Printer *p, Fl_Widget *w, int x, int y) {
+    Fl_Gl_Window *glw = w->as_gl_window();
+    if (!glw) return 0;
+    // FIXME: this is a dangerous cast! Remove Fl_Gl_Printer entirely and add 
+    // FIXME: a static function (may be a friend of Fl_Printer).
+    Fl_Gl_Printer *glp = (Fl_Gl_Printer*)p;
+    glp->print_gl_window(glw, x, y);
+    return 1; 
+  }
+};
+
+static Fl_Gl_Device_Plugin Gl_Device_Plugin;
+