Glut und Subwindows

[TheTester]

Hi

für eine bessere Darstellung eines Problems sehe ich mich gezwungen mit Glut 2 Fenster zu rendern. Ich würde alles gerne in einem Hauptfenster (2D) mit einem Subwindow (3D) erledigen. Irgendwie funktionierts nicht und ich hab ehrlich gesagt keinen Schimmer woran es liegt.

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <time.h>

#include <windows.h>
#include <GL/glut.h>

#define WND_HEIGHT 300
#define WND_WIDTH 512

int mainWnd, subWnd;

void mainDisp(void)
{
  glutSetWindow (mainWnd);
  glClearColor (1, 1, 1, 0.0);
  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  glLoadIdentity ();

	glBegin(GL_LINES);
		glColor3f(.8, .4, .4);
		glVertex3f(0,0,0);
		glVertex3f(2,0,0);

		glColor3f(.4, .8, .4);
		glVertex3f(0,0,0);
		glVertex3f(0,2,0);
   glEnd();

  glutSwapBuffers();
}

void subDisp(void)
{
  glutSetWindow (subWnd);
  glClearColor (0.25, 0.25, 0.25, 0.0);
  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  glLoadIdentity ();

	glBegin(GL_LINES);
		glColor3f(.8, .4, .4);
		glVertex3f(0,0,0);
		glVertex3f(2,0,0);

		glColor3f(.4, .8, .4);
		glVertex3f(0,0,0);
		glVertex3f(0,2,0);
   glEnd();

  glutSwapBuffers();
}

void mainReshape(int w, int h)
{
  if(!h) h = 1;

  glViewport (0, 0, w, h);
  glMatrixMode (GL_PROJECTION);
  glLoadIdentity ();

  gluOrtho2D (0, WND_WIDTH/2, 0, WND_HEIGHT);

  glMatrixMode (GL_MODELVIEW);
  glLoadIdentity ();

  glutSetWindow (subWnd);
  glutReshapeWindow (WND_WIDTH / 2, WND_HEIGHT );
  glutPositionWindow (WND_WIDTH/2, 0);
  glutSetWindow (mainWnd);
}

void subReshape(int w, int h)
{
	GLfloat nRange = 10.0f;
	float ar = (float)h/(float)w;

	if(!h) h = 1;
	glViewport(0,0,w,h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	if(w <=h)
		glOrtho(-nRange, nRange, -nRange*ar, nRange*ar, -nRange, nRange);
	else
		glOrtho(-nRange*ar, nRange*ar, -nRange, nRange, -nRange, nRange);

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

}
int main(void)
{

  glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
  glutInitWindowPosition (100, 100);
  glutInitWindowSize (WND_WIDTH, WND_HEIGHT);

  mainWnd= glutCreateWindow ("test");
  glutDisplayFunc (mainDisp);
  glutReshapeFunc (mainReshape);

  subWnd = glutCreateSubWindow (mainWnd, WND_WIDTH/2, 0, WND_WIDTH / 2, WND_HEIGHT );
  glutDisplayFunc (subDisp);
  glutReshapeFunc (subReshape);

  glutMainLoop ();

return 0;
}