Shader "Example/UISoftMask"
{
    Properties
    {
        //...
        //1. SHADER PROPERTIES
        // Add this line into ShaderLab Properties Block
        [PerRendererData]_SoftMask("_SoftMask", 2D) = "white" {}
        //...
    }
    SubShader
    {
        Pass
        {
            CGPROGRAM

            //...
            //2. INCLUDE & PROPERTIES
            // Add both lines before your 'Vertex Output' struct.
            // Note: Make sure to change include path if you are using a different location for 'AMS UI Soft Mask' package
            #include_with_pragmas "Assets/AMS/UISoftMask/Shader/Utils/UISoftMask.hlsl" 
            uniform sampler2D _SoftMask;
            //...

            struct Varyings{
                //...
                //3. VERTEX OUTPUT STRUCT
                // Add this line into 'Vertex Output' struct.
                float2 softMaskUV : TEXCOORDX; // 'X' being the TexCoord Index available on struct
                //...
            }

            Varyings vert (Attributes IN)
            {
                //...
                //4. VERTEX FUNCTION
                // Add both lines into Vertex function
                // Note: 'IN.vertex' being the corresponding 'Vertex Data : POSITION' and 'OUT' being the 'Vertex Output' in vertex function
                float4 wPos = mul(unity_ObjectToWorld, IN.vertex);
                OUT.softMaskUV.xy = RectUV(wPos); 
                //...
            }

            half4 frag(Varyings IN) : SV_Target
            {
                //...
                //5. FRAGMENT FUNCTION
                // Add this line into Fragment function just before UNITY_UI_ALPHACLIP instruction
                // Note: 'IN' being the corresponding 'Vertex Output' and 'color' the candidate fragment output
                color.a = UISoftMask(IN.softMaskUV, _SoftMask, color.a);
                //...
            }

            ENDCG
        }
    }
}