How can i translate this shader to URP shader??

Unity Engine
, ,
1

hi everyone,

I create this shader a long time ago. I need to use it in another project, but in the new project I work with URP, but when I try to import, shows me some troubles. I saw that the code changed in the URP. so how can I change the code?

I guess the only difference is to change the CGPROGRAM to HLSLPROGRAM, but when I change it the following error appears

“Shader error in ‘labxsp/Piso’: Unexpected identifier “fixed4”. Expected one of: typedef const void inline uniform nointerpolation extern shared static volatile row_major column_major struct sampler or a user-defined type at UnityLightingCommon.cginc(4)”

i change the fixed4 to float4. but it doesn’t work.
i share the code

this is the old code

Shader "labxsp/Piso"
{
    Properties
    {
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _tamanoCuadricula ("Tamaño de cuadricula", float) = 4
        _GrosorLinea ("Grosor de Linea", Range (0.0,1.0)) = .1
        _ColorLinea ("Color de Linea", Color) = (1,0,0,1)
        _ColorPiso ("Color del piso", Color) = (0,0,0,1)
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        CGPROGRAM
        #pragma surface surf Unlit alpha

       
        sampler2D _MainTex;
        float _tamanoCuadricula, _GrosorLinea;
        float4 _ColorLinea, _ColorPiso;
        struct Input
        {
            float2 uv_MainTex;
        };

        void surf (Input IN, inout SurfaceOutput o)
        {
            float4 c = _ColorPiso;
            float2 uv = IN.uv_MainTex;
            float2 cuadricula = frac(uv * _tamanoCuadricula);
            if (cuadricula.x > _GrosorLinea || cuadricula.y > _GrosorLinea)
            {
                //o.Emission = _ColorLinea * cos(_Time.y)*.5+.5;
                o.Emission = _ColorLinea* sin(_Time.y /3);    

            } 
            o.Albedo = c.rgb;
            o.Alpha = c.a;
        }
                half4 LightingUnlit(SurfaceOutput s, half3 lightDir, half atten)
        {
            fixed4 c;
            c.rgb = s.Albedo.rgb;
            c.a = s.Alpha;
            return c;       
        }
        ENDCG
    }
    FallBack "Diffuse"
}

This is the new code

Shader "labxsp/Piso"
{
    Properties
    {
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _tamanoCuadricula ("Tamaño de cuadricula", float) = 4
        _GrosorLinea ("Grosor de Linea", Range (0.0,1.0)) = .1
        _ColorLinea ("Color de Linea", Color) = (1,0,0,1)
        _ColorPiso ("Color del piso", Color) = (0,0,0,1)
    }
    SubShader
    {
        Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalRenderPipeline" }
        HLSLPROGRAM
        #pragma surface surf Unlit alpha

       
        sampler2D _MainTex;
        float _tamanoCuadricula, _GrosorLinea;
        float4 _ColorLinea, _ColorPiso;
        struct Input
        {
            float2 uv_MainTex;
        };

        void surf (Input IN, inout SurfaceOutput o)
        {
            float4 c = _ColorPiso;
            float2 uv = IN.uv_MainTex;
            float2 cuadricula = frac(uv * _tamanoCuadricula);
            if (cuadricula.x > _GrosorLinea || cuadricula.y > _GrosorLinea)
            {
                //o.Emission = _ColorLinea * cos(_Time.y)*.5+.5;
                o.Emission = _ColorLinea* sin(_Time.y /3);    

            } 
            o.Albedo = c.rgb;
            o.Alpha = c.a;
        }
                half4 LightingUnlit(SurfaceOutput s, half3 lightDir, half atten)
        {
            float4 c;
            c.rgb = s.Albedo.rgb;
            c.a = s.Alpha;
            return c;       
        }
        ENDHLSL
    }
    FallBack "Diffuse"
}

Thanks a lot.

2

Surface shaders are not supported in the URP (or any SRP renderer). You’ll need to convert it to regular Vertex and Fragment shaders.