Shader "Unlit/TalkBg"
{
    Properties
    {
        _MainColor ("Main Color", Color) = (0,0,0,0.5)
    }
    SubShader
    {
        Tags
        {
            "RenderType"="Transparent"
            "RenderQueue"="Transparent"
            "PreviewType" = "Plane"
            "RenderPipeline"="UniversalPipeline"
        }
        LOD 100

        Pass
        {
            
            Cull Off
            Blend SrcAlpha OneMinusSrcAlpha
            ZTest LEqual
            ZWrite Off
            
            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment frag

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

            struct appdata {
                float4 vertex : POSITION;

                UNITY_VERTEX_INPUT_INSTANCE_ID
            };

            struct v2f {
                float4 vertex : SV_POSITION;

                UNITY_VERTEX_INPUT_INSTANCE_ID
                UNITY_VERTEX_OUTPUT_STEREO
            };

            CBUFFER_START(UnityPerMaterial)
                float4 _MainColor;
            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);
                return o;
            }

            half4 frag(v2f IN) : SV_Target
            {
                UNITY_SETUP_INSTANCE_ID(IN);
                UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(IN);
                
                return _MainColor;
            }
            ENDHLSL
        }
    }
}