Top Most Font shader. Useful to ignore Z Buffer reads...

TopMostFont.shader

     Shader "UI/TopMostFont" {
         Properties {
             _MainTex ("Font Texture", 2D) = "white" {}
             _Color ("Text Color", Color) = (1,1,1,1)
             
             _StencilComp ("Stencil Comparison", Float) = 8
             _Stencil ("Stencil ID", Float) = 0
             _StencilOp ("Stencil Operation", Float) = 0
             _StencilWriteMask ("Stencil Write Mask", Float) = 255
             _StencilReadMask ("Stencil Read Mask", Float) = 255
     
             _ColorMask ("Color Mask", Float) = 15
         }
     
         SubShader {
     
             Tags 
             {
                 "Queue"="Geometry"
                 "IgnoreProjector"="True"
                 "RenderType"="Geometry"
                 "PreviewType"="Plane"
             }
             
             Stencil
             {
                 Ref [_Stencil]
                 Comp [_StencilComp]
                 Pass [_StencilOp] 
                 ReadMask [_StencilReadMask]
                 WriteMask [_StencilWriteMask]
             }
             
             Lighting Off 
             Cull Off 
             ZTest Off
             ZWrite Off 
             Blend SrcAlpha OneMinusSrcAlpha
             ColorMask [_ColorMask]
     
             Pass 
             {
                 CGPROGRAM
                 #pragma vertex vert
                 #pragma fragment frag
     
                 #include "UnityCG.cginc"
     
                 struct appdata_t {
                     float4 vertex : POSITION;
                     fixed4 color : COLOR;
                     float2 texcoord : TEXCOORD0;
                 };
     
                 struct v2f {
                     float4 vertex : SV_POSITION;
                     fixed4 color : COLOR;
                     float2 texcoord : TEXCOORD0;
                 };
     
                 sampler2D _MainTex;
                 uniform float4 _MainTex_ST;
                 uniform fixed4 _Color;
                 
                 v2f vert (appdata_t v)
                 {
                     v2f o;
                     o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
                     o.color = v.color * _Color;
                     o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
     #ifdef UNITY_HALF_TEXEL_OFFSET
                     o.vertex.xy += (_ScreenParams.zw-1.0)*float2(-1,1);
     #endif
                     return o;
                 }
     
                 fixed4 frag (v2f i) : SV_Target
                 {
                     fixed4 col = i.color;
                     col.a *= tex2D(_MainTex, i.texcoord).a;
                     clip (col.a - 0.01);
                     return col;
                 }
                 ENDCG 
             }
         }
     }