STR #1394

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STR #1394

Application:FLTK Library
Status:5 - New
Priority:3 - Moderate, e.g. unable to compile the software
Scope:2 - Specific to an operating system
Subsystem:Unassigned
Summary:Adding GlWindow to a window after show() is called causes crash
Version:2.0-current
Created By:greg.ercolano
Assigned To:Unassigned
Fix Version:Unassigned
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#1 greg.ercolano
12:04 Aug 19, 2006
This is under fedora3, but might be under other OS's too.

-------- snip
#include <fltk/run.h>
#include <fltk/GlWindow.h>
#include <fltk/Window.h>
#include <fltk/gl.h>
class MyGlWindow : public fltk::GlWindow {
   void draw() {
       if (!valid())
           { valid(1); glLoadIdentity(); glViewport(0,0,w(),h()); }
       glClearColor(1.0,0.0,0.0,1.0);
       glClear(GL_COLOR_BUFFER_BIT);
   }
   public:
      MyGlWindow(int x, int y, int w, int h) : fltk::GlWindow(x,y,w,h) { }
};
int main() {
   fltk::Window fig(400,400);
   fig.resizable(fig);
   fig.show();         // (A)
   fig.begin();
     MyGlWindow mygl(0,0,400,400);
     mygl.end();
   fig.end();
   //fig.show();         // (B)
   fltk::run();
}
-------- snip

FLTK crashes if you uncomment (A), and comment (B).
It runs fine if you switch to comment (A) and *uncomment* (B).

So it seems if one tries to create the GL window after
calling show(), you'll get the crash. Hopefully it wouldn't
be a problem to do this, as I could see where one wants to dynamically
add a GlWindow to a Window, after the Window has been created and show()n. (See Herbert Egger's 8/18/06 post on fltk.opengl)
 
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