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OpenGL writing glut program in oo manner

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hello everyone. I am using OpenGl(glut) for my semester project. Opengl is written in C but i wanted to use in oo manner via c++. Since I am a java programmer and i am not that much involved in c++. I have written this code which gives me error.Please help. #include <GL/glut.h> class HelloPolygon { public: void display(void); void init(); }; void HelloPolygon::display(void) { glClear(GL_COLOR_BUFFER_BIT); glColor3f(1.0,1.0,1.0); glBegin(GL_POLYGON); glVertex3f(0.25,0.25,0.0); glVertex3f(0.75,0.25,0.0); glVertex3f(0.75,0.75,0.0); glVertex3f(0.25,0.75,0.0); glEnd(); glFlush(); } void HelloPolygon::init() { glClearColor(0.0,0.0,0.0,0.0); /* initialize viewing values */ glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0.0,1.0,0.0,1.0,-1.0,1.0); } int main(int argc,char **argv) { HelloPolygon hello; glutInit(&argc,argv); glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); glutInitWindowSize(300,300); glutCreateWindow("hello"); hello.init(); glutDisplayFunc(hello.display); glutMainLoop(); return 0; }

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Hi.
You must use static methods.


class HelloPolygon
{
public:
static void display(void);
static void init();
};


Take a look at this link: http://www.clockworkcoders.com/oglsl/
Download the libglsl-1.0.0 and you will have a good example of glut and OO.

Regards

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Thanks.
I made my method static and now its working.
Then Why was it giving error when my method was non-static ?

Thanks.

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