func StencilFunc(xfunc uint32, ref int32, mask uint32) {
	C.glowStencilFunc(gpStencilFunc, (C.GLenum)(xfunc), (C.GLint)(ref), (C.GLuint)(mask))
}
func StencilFunc(xfunc uint32, ref int32, mask uint32) {
	C.glowStencilFunc(gpStencilFunc, (C.GLenum)(xfunc), (C.GLint)(ref), (C.GLuint)(mask))
}
func StencilFunc ( xfunc uint32 , ref int32 , mask uint32 ) { C . glowStencilFunc ( gpStencilFunc , ( C . GLenum ) ( xfunc ) , ( C . GLint ) ( ref ) , ( C . GLuint ) ( mask ) ) }
// set front and back function and reference value for stencil testing
set front and back function and reference value for stencil testing