#ifndef SKY_BOX_FOG  
	#define SKY_BOX_FOG
	#if defined(FOG_LINEAR) || defined(FOG_EXP) || defined(FOG_EXP2)
		#define APPLY_SKY_BOX_FOG(coord, col) col.rgb = ApplyFogColor(coord, col, unity_FogColor);
	#else
		#define APPLY_SKY_BOX_FOG(coord, col)
	#endif
	
	#if defined(FOG_LINEAR) || defined(FOG_EXP) || defined(FOG_EXP2)
		uniform fixed _FogRatio;
		fixed3 ApplyFogColor(fixed4 coord, fixed4 col, fixed4 fogCol)
		{
		#if (SHADER_TARGET < 30) || defined(SHADER_API_MOBILE)
			// mobile or SM2.0: fog factor was already calculated per-vertex, so just lerp the color
			fixed3 fog = lerp(fogCol.rgb, col.rgb, saturate(coord.x));
		#else
			// SM3.0 and PC/console: calculate fog factor and lerp fog color
			UNITY_CALC_FOG_FACTOR(coord.x);
			fixed3 fog = lerp(fogCol.rgb, col.rgb, saturate(unityFogFactor));
		#endif
			return lerp(col.rgb, fog, _FogRatio);
		}
	#endif
#endif