STATIC SUB ClearColor ( Red AS Float, Green AS Float, Blue AS Float, Alpha AS Float )
Gl.ClearColor specifies the red, green, blue, and alpha values used by Gl.Clear to clear the color buffers. Values specified by Gl.ClearColor are clamped to the range [0, 1].
Gl.GL_INVALID_OPERATION is generated if Gl.ClearColor is called between a call to Gl.Begin and the corresponding call to Gl.End.
Gl.GetColorClearValue