Shader "Toon/OutlineShader"
{
	Properties
	{
		_OutlineColor("Outline Color", Color) = (0,0,0,1)
		_Outline("Outline width", Range(0.0, 0.03)) = .005
	}
		SubShader
	{
		Tags { "RenderType" = "Opaque" }

		Cull Front
		ZWrite On
		ColorMask RGB
		Blend SrcAlpha OneMinusSrcAlpha

		Pass
		{
			Name "OUTLINE"

			HLSLPROGRAM
			#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"

			#pragma vertex vert
			#pragma fragment frag
			#pragma multi_compile_fog

			CBUFFER_START(UnityPerMaterial)
			float _Outline;
			float4 _OutlineColor;
			CBUFFER_END

			struct Attributes
			{
				float4 positionOS : POSITION;
				float3 normalOS : NORMAL;
				UNITY_VERTEX_INPUT_INSTANCE_ID
			};

			struct Varyings
			{
				float4 positionCS : SV_POSITION;
				half fogCoord : TEXCOORD0;
				half4 color : COLOR;
				UNITY_VERTEX_OUTPUT_STEREO
			};

			Varyings vert(Attributes input)
			{
				Varyings output = (Varyings)0;
				UNITY_SETUP_INSTANCE_ID(input);
				UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);

				input.positionOS.xyz += input.normalOS.xyz * _Outline;

				VertexPositionInputs vertexInput = GetVertexPositionInputs(input.positionOS.xyz);
				output.positionCS = vertexInput.positionCS;

				output.color = _OutlineColor;
				output.fogCoord = ComputeFogFactor(output.positionCS.z);
				return output;
			}

			half4 frag(Varyings i) : SV_Target
			{
				i.color.rgb = MixFog(i.color.rgb, i.fogCoord);
				return i.color;
			}
			ENDHLSL
		}
	}
}