Simple diffuse surface shader with mip map bias support

BiasDiffuse.shader

Shader "Futuclass/BiasDiffuse"
{
    Properties
    {
        _MainTex ("Base (RGB)", 2D) = "white" {}
        _MainTexBias ("Mip Bias", float) = -0.5
    }
    SubShader
    {
        Tags
        {
            "RenderType"="Opaque"
        }
        LOD 150

        CGPROGRAM
        #pragma surface surf Lambert noforwardadd

        sampler2D _MainTex;
        half _MainTexBias;
        
        struct Input
        {
            float2 uv_MainTex;
        };

        void surf(Input IN, inout SurfaceOutput o)
        {
            const fixed4 c = tex2Dbias(_MainTex, half4(IN.uv_MainTex.x, IN.uv_MainTex.y, 0.0, _MainTexBias));
            o.Albedo = c.rgb;
            o.Alpha = c.a;
        }
        ENDCG
    }

    Fallback "Mobile/Diffuse"
}