unity3d置灰image图片shader

淩亂°似流年 2022-02-13 06:15 437阅读 0赞

新建材质球，赋值该shader，将材质球复制到image上即可置灰image

Shader "UIEffect/ImageGray"
    {
        Properties
        {
            [PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
            _Color("Tint", 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" = "Transparent"
                    "IgnoreProjector" = "True"
                    "RenderType" = "Transparent"
                    "PreviewType" = "Plane"
                    "CanUseSpriteAtlas" = "True"
                }
    
                Stencil
                {
                    Ref[_Stencil]
                    Comp[_StencilComp]
                    Pass[_StencilOp]
                    ReadMask[_StencilReadMask]
                    WriteMask[_StencilWriteMask]
                }
    
                Cull Off
                Lighting Off
                ZWrite Off
                ZTest[unity_GUIZTestMode]
                Fog { Mode Off }
                Blend SrcAlpha OneMinusSrcAlpha
                ColorMask[_ColorMask]
    
                Pass
                {
                CGPROGRAM
                    #pragma vertex vert
                    #pragma fragment frag
                    #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.vertex.xy += (_ScreenParams.zw - 1.0)*float2(-1,1);
                        OUT.color = IN.color * _Color;
                        return OUT;
                    }
    
                    sampler2D _MainTex;
    
                    fixed4 frag(v2f IN) : SV_Target
                    {
                        half4 color = tex2D(_MainTex, IN.texcoord) * IN.color;
                        clip(color.a - 0.01);
                        float gray = dot(color.rgb, fixed3(0.22, 0.707, 0.071));
                        return half4(gray,gray,gray,color.a);
                    }
                ENDCG
                }
            }
    }