Fog.ffx

DECLARATIONS fog_global
	include global
{{
	void CalculateFog( float4 iPosition, float height, float in_fog_length, out float out_fog )
	{
		float3 to_camera = iPosition.xyz - camera_position;
		float fog_depth = iPosition.z - height;
		float to_cam_percent = saturate( fog_depth / abs( to_camera.z ) );
		float fog_length = length( to_camera ) * to_cam_percent;
		out_fog = saturate( fog_length / in_fog_length );
	}
}}

DECLARATIONS fog_functions
	include fog_global
	include screen_space_global_illumination
{{
}}

FRAGMENT fog
	include fog_functions
	inout SurfaceData surfaceData : surface_data
	inout EmissionData emissionData : emission_data
{{
	emissionData.pixel_color = ApplyGlobalFog(float4(surfaceData.world_pos, 1.0f), emissionData.pixel_color);
}}



FRAGMENT fog_custom_pos
	include fog_functions
	inout SurfaceData surfaceData : surface_data
	inout EmissionData emissionData : emission_data
{{
	emissionData.pixel_color = ApplyGlobalFog(float4(surfaceData.world_pos, 1.0f), emissionData.pixel_color);
}}

// deprecated fragments
FRAGMENT fog_linear
{{
}}

FRAGMENT fog_exp
{{
}}

FRAGMENT end_fog
{{
}}