halflife-wasteland-sdk/cl_dll/in_defs.h

#if !defined( IN_DEFSH )
#define IN_DEFSH
#pragma once

// up / down
#define	PITCH	0
// left / right
#define	YAW		1
// fall over
#define	ROLL	2 

#define DLLEXPORT __declspec( dllexport )

#endif