Shader "URPWater/VFX/FoamFX"
{
    Properties
    {
        _MainTex ("Foam Mask", 2D) = "white" {}
    }
    SubShader
    {
        Tags {"Queue"="Transparent" "RenderType"="Transparent"  "RenderPipeline"="UniversalPipeline"}
        ColorMask RGB
        Blend SrcAlpha OneMinusSrcAlpha
        Zwrite Off
        LOD 100

        Pass
        {
            Name "URPWaterFoamFX"

            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma prefer_hlslcc gles
            #pragma exclude_renderers d3d11_9x
            #pragma multi_compile_instancing

            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"   


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

                UNITY_VERTEX_INPUT_INSTANCE_ID
            };

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

                UNITY_VERTEX_INPUT_INSTANCE_ID
                UNITY_VERTEX_OUTPUT_STEREO
            };

            CBUFFER_START(UnityPerMaterial)
            sampler2D _MainTex;
            float4 _MainTex_ST;
            CBUFFER_END

            v2f vert (appdata v)
            {
                v2f o;

                UNITY_SETUP_INSTANCE_ID(v);
                UNITY_TRANSFER_INSTANCE_ID(v, o);
                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);

                o.vertex = TransformObjectToHClip(v.vertex.xyz);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                o.color = v.color;

                return o;
            }

            half4 frag (v2f i) : SV_Target
            {
                half4 col = tex2D(_MainTex, i.uv) * i.color;
                col *= half4(0, 0, 1, 1 * col.b);

                return col;
            }
            ENDHLSL
        }
    }
}