Shader "Shader Graphs/VertexColorLitShader"
{
    Properties
    {
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 200

        Pass
        {
            Name "ForwardLit"
            Tags { "LightMode" = "UniversalForward" }

            HLSLPROGRAM

            // Pipeline directives
            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile_fog
            #pragma multi_compile _ _MAIN_LIGHT_SHADOWS
            #pragma multi_compile _ _ADDITIONAL_LIGHTS_VERTEX _ADDITIONAL_LIGHTS
            #pragma multi_compile _ _SHADOWS_SOFT
            #pragma multi_compile _ LIGHTMAP_SHADOW_MIXING
            #pragma multi_compile _ DIRLIGHTMAP_COMBINED
            #pragma multi_compile _ LIGHTMAP_ON

            // Includes
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/ShaderVariablesFunctions.hlsl"

            struct Attributes
            {
                float4 positionOS : POSITION;
                float3 normalOS : NORMAL;
                float4 tangentOS : TANGENT;
                float4 color : COLOR;
            };

            struct Varyings
            {
                float4 positionHCS : SV_POSITION;
                float3 normalWS : TEXCOORD0;
                float3 tangentWS : TEXCOORD1;
                float3 bitangentWS : TEXCOORD2;
                float4 color : COLOR;
                float3 posWS : TEXCOORD3;
                float4 shadowCoord : TEXCOORD4;
            };

            Varyings vert(Attributes input)
            {
                Varyings output;

                // World space positions & normals
                float3 posWS = TransformObjectToWorld(input.positionOS.xyz);
                float3 normalWS = TransformObjectToWorldNormal(input.normalOS);
                float3 tangentWS = TransformObjectToWorldDir(input.tangentOS.xyz);
                float3 bitangentWS = cross(normalWS, tangentWS) * input.tangentOS.w;

                output.positionHCS = TransformWorldToHClip(posWS);
                output.normalWS = normalWS;
                output.tangentWS = tangentWS;
                output.bitangentWS = bitangentWS;
                output.color = input.color;
                output.posWS = posWS;
                output.shadowCoord = TransformWorldToShadowCoord(posWS);

                return output;
            }

            half4 frag(Varyings input) : SV_Target
            {
                float3 viewDirWS = normalize(_WorldSpaceCameraPos - input.posWS);
                float3 normalWS = normalize(input.normalWS);

                // Required for URP lighting
                InputData inputData = (InputData)0;
                inputData.positionWS = input.posWS;
                inputData.normalWS = normalWS;
                inputData.viewDirectionWS = viewDirWS;
                inputData.shadowCoord = input.shadowCoord;

                // Compute tangent space normal (not using a normal map, so fake Z)
                float3x3 tangentSpace = float3x3(
                    normalize(input.tangentWS),
                    normalize(input.bitangentWS),
                    normalize(input.normalWS)
                );
                float3 normalTS = mul(tangentSpace, float3(0, 0, 1));

                // Fill SurfaceData with vertex color
                SurfaceData surfaceData;
                surfaceData.albedo = input.color.rgb;
                surfaceData.alpha = 1.0;
                surfaceData.metallic = 0.0;
                surfaceData.specular = 0.0;
                surfaceData.smoothness = 0.3;
                surfaceData.normalTS = normalTS;
                surfaceData.emission = float3(0, 0, 0);
                surfaceData.occlusion = 1.0;
                surfaceData.clearCoatMask = 0.0;
                surfaceData.clearCoatSmoothness = 0.0;

                return UniversalFragmentPBR(inputData, surfaceData);
            }

            ENDHLSL
        }
    }
    FallBack "Hidden/Universal Render Pipeline/FallbackError"
}