Decal2UVs

Author: Aras Pranckevicius

Description

Just like builtin Decal - allows you to have a base texture with another transparent texture "splatted on top". The only difference is that the additional decal texture here uses 2nd UV set (whereas in builtin shader both use the same UV set).

Works on three texture graphics cards (GeForce3/4Ti and up, Radeon and up).

ShaderLab - Decal2UVs.shader

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Shader " Decal (2 UV sets)" {
Properties {
    _Color ("Main Color", Color) = (1,1,1,1)
    _SpecColor ("Spec Color", Color) = (1,1,1,1)
    _Emission ("Emmisive Color", Color) = (0,0,0,0)
    _Shininess ("Shininess", Range (0.01, 1)) = 0.7
    _MainTex ("Base (RGB)", 2D) = "white" {}
    _DecalTex ("Decal (RGBA)", 2D) = "black" {}
}

SubShader {
    Material {
        Diffuse [_Color]
        Ambient [_Color]
        Shininess [_Shininess]
        Specular [_SpecColor]
        Emission [_Emission]
    }
    Pass {
        BindChannels {
            Bind "Vertex", vertex
            Bind "normal", normal
            Bind "texcoord", texcoord0 // main uses 1st uv
            Bind "texcoord1", texcoord1 // decal uses 2nd uv
        }
        Lighting On
        SeperateSpecular On
        SetTexture [_MainTex] {combine texture}
        SetTexture [_DecalTex] {combine texture lerp (texture) previous}
        SetTexture [_MainTex] {combine previous * primary DOUBLE, previous * constant constantColor [_Color]}
    }
}

Fallback " VertexLit", 1

}