MoonlightVRC/Shader/WaterParticle.shader

Shader "DeMuenu/World/Hoppou/WaterParticle"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _AlphaMap ("Alpha Map", 2D) = "white" {}
        _Color ("Tint", Color) = (1,1,1,1)
    }
    SubShader
    {
        Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane" }
        Blend SrcAlpha OneMinusSrcAlpha   // normal alpha blend (not additive)
        ZWrite Off
        Lighting Off
        Cull Off
        LOD 100

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

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv     : TEXCOORD0;
                float4 color  : COLOR;
            };

            struct v2f
            {
                float2 uv      : TEXCOORD0;
                float4 vertex  : SV_POSITION;
                float4 color   : COLOR;
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;
            sampler2D _AlphaMap;
            fixed4 _Color;

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                o.color = v.color;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 col = tex2D(_MainTex, i.uv) * _Color;
                float alpha = tex2D(_AlphaMap, i.uv).r;
                return col * alpha * i.color;  // col.a drives the blend
            }
            ENDCG
        }
    }
}