Dissolve

Shader "Custom/fx_Dissolve_Mask_One"
{
    Properties
    {
        _SliceGuide ("Slice Guide (RGB)", 2D) = "white" {}
        _Clip("Clip", Range(0, 1)) = 0
        [Enum(UnityEngine.Rendering.BlendMode)] _SrcBlend("SrcBlend mode", Float) = 1
        [Enum(UnityEngine.Rendering.BlendMode)] _DstBlend("DstBlend mode", Float) = 1   
    }
    SubShader
    {
        // No culling or depth
        Tags { "Queue"="Transparent" "RenderType"="Transparent" }

        Cull Off ZWrite On //ZTest Always
        Blend [_SrcBlend] [_DstBlend]

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                fixed4 color : COLOR;
                float4 uv : TEXCOORD0;
                float customdata1 : TEXCOORD1;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                fixed4 color : COLOR;
                float2 uv : TEXCOORD0;
                float customdata1 : TEXCOORD1;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);                
                o.color = v.color;
                o.uv = v.uv;
                o.customdata1 = v.uv.z;
                return o;
            }

            sampler2D _SliceGuide;         
            float _Clip;

            fixed4 frag (v2f i) : SV_Target
            {
                // Custom Vertex Stream
                float sliceAmount = 0;
                sliceAmount = i.customdata1;
                sliceAmount = min(sliceAmount, 1);
                sliceAmount = max(sliceAmount, _Clip);
            
                // Slice
                fixed4 sliceColor = tex2D(_SliceGuide, i.uv);
                sliceColor.rgb -= sliceAmount;
                clip(sliceColor);

                // Main Texture
                fixed3 mainColor = sliceColor;
                mainColor = i.color;

                // Final
                fixed4 final = fixed4(0,0,0,0);
                final.rgb = mainColor.rgb;
                final.a = i.color.a;

                return final;
            }
            ENDCG
        }
    }
}

Shader "Custom/fx_Dissolve_Mask_Twe"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _SliceGuide ("Slice Guide (RGB)", 2D) = "white" {}
        _BurnSize ("Burn Size", Range(0.0, 1.0)) = 0.15
        _Clip("Clip", Range(0, 1)) = 0        
        [Enum(UnityEngine.Rendering.BlendMode)] _SrcBlend("SrcBlend mode", Float) = 1
        [Enum(UnityEngine.Rendering.BlendMode)] _DstBlend("DstBlend mode", Float) = 1   
    }
    SubShader
    {
        Tags { "Queue"="Transparent" "RenderType"="Transparent" }

        Cull Off ZWrite On// ZTest Always
        Blend [_SrcBlend] [_DstBlend]

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                fixed4 color : COLOR;
                float4 uv : TEXCOORD0;
                float customdata1 : TEXCOORD1;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                fixed4 color : COLOR;
                float2 uv : TEXCOORD0;
                float customdata1 : TEXCOORD1;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);                
                o.color = v.color;
                o.uv = v.uv;
                o.customdata1 = v.uv.z;
                return o;
            }

            sampler2D _MainTex;
            sampler2D _SliceGuide;
            float _BurnSize;
            float _Clip;

            fixed4 frag (v2f i) : SV_Target
            {
                // Custom Vertex Stream
                float sliceAmount = 0;
                sliceAmount = i.customdata1;
                sliceAmount = min(sliceAmount, 1);
                sliceAmount = max(sliceAmount, _Clip);
            
                // Slice
                fixed4 sliceColor = tex2D(_SliceGuide, i.uv);
                sliceColor.rgb -= sliceAmount;
                clip(sliceColor);

                // Main Texture
                fixed3 mainColor = tex2D (_MainTex, i.uv).rgb;
                mainColor *= i.color;

                // Burn
                half test = tex2D (_SliceGuide, i.uv).rgb - sliceAmount;
                if(test < _BurnSize && sliceAmount > 0 && sliceAmount < 1)
                {
                    // 외각
                    mainColor = tex2D(_MainTex, float2(test *(1/_BurnSize), 0));
                }

                // Final
                fixed4 final = fixed4(0,0,0,0);
                final.rgb = mainColor.rgb;
                final.a = i.color.a;
                return final;
            }
            ENDCG
        }
    }
}