How to display a concave polygon without use of tessllation

OpenGL OpenGL: Basic Coding
1

The polygon has no inner loop, and may intersect itself, Does OpenGL provide any method to display such polygon?

I think the scan line algorithm can meet my desire, but how in OpenGL?

Thank you!

2

OpenGL only guarantees correct drawing of convex polygons. Concave polygons gives an undefined behaviour.

GLU provides some functions for concave polygons I believe.

3

Originally posted by Bob:
[b]OpenGL only guarantees correct drawing of convex polygons. Concave polygons gives an undefined behaviour.

GLU provides some functions for concave polygons I believe.[/b]

Hehe, I found that use of stencil buffer can solve this problem, and it’s a bit faster tesslation.