setup_opengl

void Setup()
{
    loader(tree);

    //Parameter handling
    glShadeModel (GL_SMOOTH);

    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LEQUAL);  //renders a fragment if its z value is less or equal of the stored value
    glClearDepth(1);

    // polygon rendering mode
    glEnable(GL_COLOR_MATERIAL);
    glColorMaterial( GL_FRONT, GL_AMBIENT_AND_DIFFUSE );

    //Set up light source
    GLfloat light_position[] = { 0.0, 30.0, 50.0, 1.0 };
    glLightfv( GL_LIGHT0, GL_POSITION, light_position);

    float ambient = 0.45;
    float diffusion = 0.1;
    float specular = 0.55;
    GLfloat ambientLight[] = { ambient, ambient, ambient, 1.0 };
    GLfloat diffuseLight[] = { diffusion, diffusion, diffusion, 1.0 };
    GLfloat specularLight[] = { specular, specular, specular, 1.0 };


    glLightfv( GL_LIGHT0, GL_AMBIENT, ambientLight );
    glLightfv( GL_LIGHT0, GL_DIFFUSE, diffuseLight );
    glLightfv( GL_LIGHT0, GL_SPECULAR, specularLight);


    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);

    glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);

    glEnable(GL_CULL_FACE);
    //glEnable(GL_CULL_FACE | GL_CULL_FACE_MODE);
    glFrontFace(GL_CW);

    glEnable(GL_BLEND);
                 // incoming //  // stored //
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);


    // Black background
    glClearColor(0.0f,0.0f,0.0f,1.0f);

}