WGL_I3D_gamma
http://oss.sgi.com/projects/ogl-sample/registry/I3D/wgl_gamma.txt
	WGL_GAMMA_TABLE_SIZE_I3D 0x204E
	WGL_GAMMA_EXCLUDE_DESKTOP_I3D 0x204F
	BOOL wglGetGammaTableI3D (HDC hDC, int iEntries, USHORT* puRed, USHORT *puGreen, USHORT *puBlue)
	BOOL wglGetGammaTableParametersI3D (HDC hDC, int iAttribute, int* piValue)
	BOOL wglSetGammaTableI3D (HDC hDC, int iEntries, const USHORT* puRed, const USHORT *puGreen, const USHORT *puBlue)
	BOOL wglSetGammaTableParametersI3D (HDC hDC, int iAttribute, const int* piValue)