#include "$ENGINE$\SurfaceData.bslinc"

#ifndef WRITE_VELOCITY
	#define WRITE_VELOCITY 0
#endif

mixin GBufferOutput 
{
	mixin SurfaceData;

	code
	{
		struct GBufferData
		{
			float4 albedo : SV_Target1;
			float4 normal : SV_Target2; 
			float2 metalRoughness : SV_Target3;
			
			#if WRITE_VELOCITY
			float2 velocity : SV_Target4;
			float id : SV_Target5;
			#else
			float id : SV_Target4;
			#endif
		};
	
		GBufferData encodeGBuffer(SurfaceData input)
		{
			GBufferData output;
			output.albedo = input.albedo;
			output.normal.xyz = float3(input.worldNormal.xyz * 0.5f + 0.5f);
			output.normal.w = 1.0f; // Marks that some deferred data was written
			output.metalRoughness.x = input.roughness;
			output.metalRoughness.y = input.metalness;
			
			#if WRITE_VELOCITY
				output.velocity = encodeVelocity16SNORM(input.velocity);
			#endif
			
			output.id = input.mask / 256.0f;
			
			return output;
		}
	};
};