Fl_Gl_Window以外のFLTKウィンドウでOpenGLを使う

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#ifdef _DEBUG
#pragma comment(lib, "fltkd.lib")
#pragma comment(lib, "fltkgld.lib")
#else
#pragma comment(lib, "fltk.lib")
#pragma comment(lib, "fltkgl.lib")
#endif
 
#pragma comment(lib, "opengl32.lib")
 
 
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
#include "FL/Fl.H"
#include "FL/Fl_Window.H"
 
#include "FL/gl.h"
 
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
class rxTestWindow : public Fl_Window
{
public:
        rxTestWindow(int x_, int y_, int w_, int h_, const char *l_ = 0)
         : Fl_Window(x_, y_, w_, h_, l_)
    {
        resizable(this);            end();
    }
 
        virtual ~rxTestWindow()
    {
    }
 
private:
         void draw(void)
    {
        int w = Fl_Window::current()->w();
        int h = Fl_Window::current()->h();
        
        gl_start();
 
        glViewport(0, 0, w, h);
 
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        glOrtho(0, 1, 0, 1, -1, 1);
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
 
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glPushMatrix();
        glDisable(GL_LIGHTING);
 
        glColor3d(0.0, 0.0, 1.0);
        glBegin(GL_POLYGON);
        glVertex2d(0.1, 0.1);
        glVertex2d(0.9, 0.1);
        glVertex2d(0.5, 0.9);
        glEnd();
 
        glPopMatrix();
 
        gl_finish();
    }
 
};
 
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------

int main(int argc, char *argv[])
{
    Fl::scheme("gtk+");
 
        Fl::gl_visual(FL_RGB);
 
    rxTestWindow *window = new rxTestWindow(100, 100, 480, 480, "FLTK + OpenGL");
    window->show(argc, argv);
    return Fl::run();
}