Shader "Custom/URP_prueba"
{
    Properties {
        _Color ("Main Color", Color) = (1,1,1,1)
        _SpecColor ("Spec Color", Color) = (1,1,1,0)
        _Emission ("Emissive Color", Color) = (0,0,0,0)
        _Shininess ("Shininess", Range (0.1, 1)) = 0.7
        _MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
    }
    SubShader {
        Tags {"RenderType"="Transparent" "Queue"="Transparent"}
        LOD 200
        Pass {
            Name "FORWARD"
            ZWrite Off
            Blend SrcAlpha OneMinusSrcAlpha
            ColorMask RGB
            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile_fog
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"

            struct Attributes {
                float4 positionOS : POSITION;
                float2 uv         : TEXCOORD0;
            };

               struct Varyings {
                   float4 positionHCS : SV_POSITION;
                   float2 uv          : TEXCOORD0;
                   float fogFactor    : TEXCOORD1;
               };

            CBUFFER_START(UnityPerMaterial)
                float4 _Color;
                float4 _SpecColor;
                float4 _Emission;
                float _Shininess;
            CBUFFER_END

            TEXTURE2D(_MainTex); SAMPLER(sampler_MainTex);

            Varyings vert(Attributes IN)
            {
                Varyings OUT;
                OUT.positionHCS = TransformObjectToHClip(IN.positionOS.xyz);
                OUT.uv = IN.uv;
                OUT.fogFactor = ComputeFogFactor(OUT.positionHCS.z / OUT.positionHCS.w);
                return OUT;
            }

            float4 frag(Varyings IN) : SV_Target
            {
                float4 albedo = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, IN.uv) * _Color;
                float3 emission = _Emission.rgb;
                float3 specular = _SpecColor.rgb * _Shininess;
                float3 color = albedo.rgb + emission + specular;
                float alpha = albedo.a;
                color = MixFog(color, IN.fogFactor);
                return float4(color, alpha);
            }
            ENDHLSL
        }
    }
}