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  "No OpenGL context current on this thread" while calling gluSphere in glNewList  (Read 2179 times)
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Offline Maok

Senior Newbie




Java games rock!


« Posted 2005-12-06 12:18:40 »

I get an Exception Exception in thread "AWT-EventQueue-0" javax.media.opengl.GLException: No OpenGL context current on this thread

here's the deal :

i get the identifiesr for my displayLists with :
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public static void createLists(GL gl, GLU glu)
{
    MyGL.gl = gl; //here i store the current GL and GLU object
   MyGL.glu = glu;
    sphere = gl.glGenLists(1);
    alterLists();
}


then i create the lists with
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public static void alterLists()
    {
        GLUquadric quadric = glu.gluNewQuadric();
        glu.gluQuadricTexture(quadric, true);
        glu.gluQuadricDrawStyle(quadric,GLU.GLU_FILL);
        glu.gluQuadricNormals(quadric, GLU.GLU_SMOOTH);
        glu.gluQuadricOrientation(quadric, GLU.GLU_OUTSIDE);

        gl.glNewList(sphere,GL.GL_COMPILE);
        glu.gluSphere(quadric,1,ballAtomComplexity,ballAtomComplexity);
       gl.glEndList();
    }


and this works fine, but later i have a ruler to chage the complexity (stack and slice number) of my sphere. When the new value for ballAtomComplexity is set by this ruler, i call again the method alterLists(), and then i get the exception with the line glu.gluSphere ....
I don't understand, since the GLU object is the same (i stored it when create the display list IDs
i also tried to put a glu = new GLU(); but its the same
i have no problem with gl.xxxxxxxxxx methods

any hint ?

Thx

Offline Ken Russell

JGO Coder




Java games rock!


« Reply #1 - Posted 2005-12-06 13:15:27 »

The OpenGL context is not current in your slider's listener callback. You should update an instance variable in your slider's callback and call display() on your GLCanvas to cause your GLEventListener to be called.
Offline Maok

Senior Newbie




Java games rock!


« Reply #2 - Posted 2005-12-06 14:46:10 »

thx it works now
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