灰度渲染

SpritesGrayShader.shader

Shader "Sprites/Gray"
{
  Properties
  {
      [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
      _Color ("Tint", Color) = (1,1,1,1)
      [MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
  }
  
  SubShader
  {
      Tags
      {
          "Queue"="Transparent"
          "IgnoreProjector"="True"
          "RenderType"="Transparent"
          "PreviewType"="Plane"
          "CanUseSpriteAtlas"="True"
      }
  
      Cull Off
      Lighting Off
      ZWrite Off
      Fog { Mode Off }
      Blend One OneMinusSrcAlpha
  
      Pass
      {
      CGPROGRAM
          #pragma vertex vert
          #pragma fragment frag
          #pragma multi_compile DUMMY PIXELSNAP_ON
          #include "UnityCG.cginc"
  
          struct appdata_t
          {
              float4 vertex   : POSITION;
              float4 color    : COLOR;
              float2 texcoord : TEXCOORD0;
          };
  
          struct v2f
          {
              float4 vertex   : SV_POSITION;
              fixed4 color    : COLOR;
              half2 texcoord  : TEXCOORD0;
          };
  
          fixed4 _Color;
  
          v2f vert(appdata_t IN)
          {
              v2f OUT;
              OUT.vertex = mul(UNITY_MATRIX_MVP, IN.vertex);
              OUT.texcoord = IN.texcoord;
              OUT.color = IN.color * _Color;
              #ifdef PIXELSNAP_ON
              OUT.vertex = UnityPixelSnap (OUT.vertex);
              #endif
  
              return OUT;
          }
  
          sampler2D _MainTex;
  
          fixed4 frag(v2f IN) : SV_Target
          {
              fixed4 c = tex2D(_MainTex, IN.texcoord) * IN.color;
              c.rgb *= c.a;
              float gray = dot(c.xyz, float3(0.299, 0.587, 0.114));
              c.xyz = float3(gray, gray, gray);
              return c;
          }
      ENDCG
      }
  }
}