Question by leejinmyoung · Aug 10, 2020 at 09:58 AM · shader mobile mobile devices mobileoptimization stencil

GPU does not support separate MRT blend modes!

Hi, I'm a game developer in Korea.

I want to use stencil in our mobile game, so I use a custom shader.

BUT I meet this message

"Shader is not supported : GPU does not support separate MRT blend modes."

Which script line should I change to use on mobile?(Some devices are active well.)

Or other way to using stencil on mobile?

This is the custom shader script.

 Properties
 {
     _Color ("Color", Color) = (1,1,1,1)
     _MainTex ("Texture", 2D) = "white" {}
     _CutOff("CutOff",Range(0,1)) = 0
 }
 SubShader
 {        
     LOD 100
     Blend SrcAlpha OneMinusSrcAlpha
     Tags { "Queue" = "Geometry-1" "RenderType"="Transparent"}  
     ColorMask RGB 0
     ZWrite Off

     Stencil
     {
         Ref 1
         Comp Always
         Pass Replace
     }

     Pass
     {
         CGPROGRAM
         #pragma vertex vert
         #pragma fragment frag
         
         #include "UnityCG.cginc"

         struct appdata
         {
             float4 vertex : POSITION;
             float2 uv : TEXCOORD0;
         };

         struct v2f
         {
             float2 uv : TEXCOORD0;
             float4 vertex : SV_POSITION;
         };

         sampler2D _MainTex;
         float4 _MainTex_ST;
         float _CutOff;
         fixed4 _Color;
         
         v2f vert (appdata v)
         {
             v2f o;
             o.vertex = UnityObjectToClipPos(v.vertex);                
             o.uv = TRANSFORM_TEX(v.uv, _MainTex);
             return o;
         }
         
         fixed4 frag (v2f i) : SV_Target
         {
             // sample the texture
             fixed4 col = tex2D(_MainTex, i.uv) * _Color;                
             float dissolve = step(col,_CutOff);
             clip(_CutOff-dissolve);
             return dissolve;
         }
         ENDCG
     }        
 }
 FallBack "Mobile/Diffuse"

Thanks for your kindness.

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