"vec3 fog3(in vec3 regularcolour)"
"{"
	"float z, fac;\n"
	"#if #include \"cvar/r_fog_linear\"\n"
		"z = gl_FragCoord.z / gl_FragCoord.w;\n"
		//"z = max(0.0, z);\n"
		"fac = (w_fogdensity - z) / (w_fogdensity - w_fogdepthbias);\n"
	"#else\n"
		"z = w_fogdensity * gl_FragCoord.z / gl_FragCoord.w;\n"
		"z = max(0.0,z-w_fogdepthbias);\n"
		"#if #include \"cvar/r_fog_exp2\"\n"
		"z *= z;\n"
		"#endif\n"
		"fac = exp2(-(z * 1.442695));\n"
		"fac = (1.0-w_fogalpha) + (clamp(fac, 0.0, 1.0)*w_fogalpha);\n"
	"#endif\n"
	"return mix(w_fogcolour, regularcolour, fac);\n"
"}\n"