// Crest Water System
// Copyright © 2024 Wave Harmonic. All rights reserved.

// Renders a specific slice of a 2D Texture Array
// https://docs.unity3d.com/Manual/SL-TextureArrays.html
Shader "Hidden/Crest/Debug/TextureArray"
{
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        Cull Off
        ZWrite Off

        Pass
        {
            CGPROGRAM
            #pragma vertex Vert
            #pragma fragment Frag
            #pragma require 2darray

            #include "UnityCG.cginc"

            struct Attributes
            {
                float4 positionOS : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct Varyings
            {
                float4 positionCS : SV_POSITION;
                float3 uv : TEXCOORD0;
            };

            UNITY_DECLARE_TEX2DARRAY(_MainTex);
            uint _Depth;
            float _Scale;
            float _Bias;

            Varyings Vert(Attributes input)
            {
                Varyings o;
                o.positionCS = UnityObjectToClipPos(input.positionOS);
                o.uv = float3(input.uv.xy, _Depth);
                return o;
            }

            half4 Frag(Varyings input) : SV_TARGET
            {
                return _Scale * UNITY_SAMPLE_TEX2DARRAY(_MainTex, input.uv) + _Bias;
            }
            ENDCG
        }
    }
}