arfoundation-samples/Assets/Scenes/ImageTracking/Prefabs/FireFliesPrefab/Shaders/FireFly.shader

Shader "Unlit/FireFlyNew"
{
    Properties
    {
        _MainTex ("Albedo (Emissive)", 2D) = "white" {}
        _Wings ("Wings", 2D) = "white" {}
        _EmissiveAmount ("_EmissiveAmount", Float) =2.0
    }
    SubShader
    {
        Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }
        LOD 100

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

            struct appdata
            {
                float4 vertex : POSITION;
                float4 uv : TEXCOORD0;
                float4 color : COLOR;
            };

            struct v2f
            {
                float4 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
                float4 color : COLOR;
            };

            sampler2D _MainTex;
            float _EmissiveAmount;
            
            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                o.color.rgba = v.color.rgba;
                return o;
            }
            
            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 col = tex2D(_MainTex, i.uv);
                
                float4 emissive = i.color * col.a;
                
                clip(i.color.a - 0.5);

                col += emissive * pow(_EmissiveAmount, 2.2);
                return col;
            }
            ENDCG
            }

        Pass
            {
            Cull Off
            Blend SrcAlpha OneMinusSrcAlpha

            CGPROGRAM

            #pragma vertex vert
            #pragma fragment frag
            
            #include "UnityCG.cginc"
            
            struct appdata
            {
                float4 vertex : POSITION;
                float4 uv : TEXCOORD0;
                float4 color : COLOR;
            };

            struct v2f
            {
                float4 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
                float4 color : COLOR;
            };

            sampler2D _Wings;
            
            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                o.color.rgba = v.color.rgba;
                return o;
            }
            
            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 wings = tex2D(_Wings, i.uv.zw);				
                wings.a = lerp( wings.a, 0, i.color.a);

                return wings;
            }
            ENDCG
            
        }
    }
}