Shader "ScriptableRenderPipeline/LightweightPipeline/Particles/Multiply"
{
    Properties
    {
        _MainTex("Particle Texture", 2D) = "white" {}
    }

    Category
    {
        Tags{"Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" "RenderPipeline" = "LightweightPipeline" "PreviewType" = "Plane"}
        Blend Zero SrcColor
        Cull Off Lighting Off ZWrite Off

        SubShader
        {
            Pass
            {
                Tags { "LightMode" = "LightweightForward" }
                CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag
                #pragma target 2.0
                #pragma multi_compile_fog

                #include "UnityCG.cginc"

                sampler2D _MainTex;

                struct appdata_t
                {
                    float4 vertex : POSITION;
                    fixed4 color : COLOR;
                    float2 texcoord : TEXCOORD0;
                };

                struct v2f
                {
                    float4 vertex : SV_POSITION;
                    fixed4 color : COLOR;
                    float2 texcoord : TEXCOORD0;
                    UNITY_FOG_COORDS(1)
                };

                float4 _MainTex_ST;

                v2f vert(appdata_t v)
                {
                    v2f o;
                    o.vertex = UnityObjectToClipPos(v.vertex);
                    o.color = v.color;
                    o.texcoord = TRANSFORM_TEX(v.texcoord,_MainTex);
                    UNITY_TRANSFER_FOG(o,o.vertex);
                    return o;
                }

                fixed4 frag(v2f i) : SV_Target
                {
                    half4 prev = i.color * tex2D(_MainTex, i.texcoord);
                    fixed4 col = lerp(half4(1,1,1,1), prev, prev.a);
                    UNITY_APPLY_FOG_COLOR(i.fogCoord, col, fixed4(1,1,1,1)); // fog towards white due to our blend mode
                    return col;
                }
                ENDCG
            }
        }
    }
}