Shader "Custom/2d_flow"
{
    Properties
    {
        _MainTex("main tex",2d) = ""{}//主贴图
        _FlowTex("flow tex",2d) = ""{}//流光图
        _MaskTex("mask tex",2d) = ""{}//过滤图
        _FlowSpeed("speed", Range(0,1)) = 1.0//流光移动速度
    }
 
    SubShader
    {
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include"UnityCG.cginc"
 
            sampler2D _MainTex;
            sampler2D _FlowTex;
            sampler2D _MaskTex;
            float _FlowSpeed;
 
            struct v2f
            {
                float4 vertex:POSITION;
                float4 uv:TEXCOORD0;
            };
 
            v2f vert(appdata_base v)
            {
                v2f o;
                o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
                o.uv = v.texcoord;
                return o;
            }
 
            half4 frag(v2f IN):COLOR
            {
                //采样主贴图
                half4 c = tex2D(_MainTex,IN.uv);
 
                //流光uv移动
                half2 flow_uv = half2(IN.uv.x / 2,IN.uv.y);
                flow_uv.x += -_FlowSpeed * _Time.w;
                half4 flow = tex2D(_FlowTex, flow_uv);
                flow.rgb *= half3(1,1,0);
 
                //根据过滤图的alpha值，将流光效果限制在文字上
                half4 mask = tex2D(_MaskTex,IN.uv);
                if (mask.a == 1)
                {
                    c.rgb /= 1.5;
                    c.rgb += flow.rgb;
                }
                return c;
            }
            ENDCG
        }
    }
    FallBack "Diffuse"
}

主要就是uv移动，颜色混合。

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