UGUI之图片黑白Shader

发表于2018-12-04
评论0 5.6k浏览
为了让场景或者物体显得好看,大多数开发人员会给图片或物体加上绚丽的色彩效果,但是在不同场景下,可能还会有不同的色彩效果出现,就像本篇中给大家介绍的实现图片黑白的shader效果。

Shader:
// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
Shader "UI/Default Grey"     
{     
    Properties     
    {     
        [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}     
        _Color ("Tint", Color) = (1,1,1,1)  
    }     
    SubShader     
    {     
        Tags     
        {      
            "Queue"="Transparent"      
            "IgnoreProjector"="True"      
            "RenderType"="Transparent"      
            "PreviewType"="Plane"     
            "CanUseSpriteAtlas"="True"     
        }     
        // 源rgba*源a + 背景rgba*(1-源A值)   
        Blend SrcAlpha OneMinusSrcAlpha  
        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;     
            };     
            sampler2D _MainTex;       
            fixed4 _Color;     
            v2f vert(appdata_t IN)     
            {     
                v2f OUT;     
                OUT.vertex = UnityObjectToClipPos(IN.vertex);     
                OUT.texcoord = IN.texcoord;     
#ifdef UNITY_HALF_TEXEL_OFFSET     
                OUT.vertex.xy -= (_ScreenParams.zw-1.0);     
#endif     
                OUT.color = IN.color * _Color;     
                return OUT;  
            }  
            fixed4 frag(v2f IN) : SV_Target     
            {     
                half4 color = tex2D(_MainTex, IN.texcoord) * IN.color;     
                float grey = dot(color.rgb, fixed3(0.22, 0.707, 0.071));   
                return half4(grey,grey,grey,color.a);     
            }     
            ENDCG     
        }     
    }     
}

效果图:

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