Shader "zzwater/waterPlant"
{
    Properties
    {
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _TineColor("Tine color", Color) = (1,1,1)
        _SwayFreq("Sway Frequency", Range(0,5)) = 1.0
        _SwayIntensity("Sway Intensity", Range(0.05,0.5)) = 0.1
        _WaterDir("Water Direction", Vector) = (1,0,0,0)
        // _waterDir.w for wave diff from each other
    }

    SubShader
    {
        Tags
        {
            "RenderPipeline"="UniversalPipeline"
            "RenderType"="Opaque"
            "UniversalMaterialType" = "Unlit"
            "Queue"="Geometry"
            "DisableBatching"="False"
        }

        Pass
        {
            Name "Universal Forward"

            Tags
            {
                // LightMode: <None>
            }

            // Render State
            Cull Back
            Blend One Zero
            ZTest LEqual
            ZWrite On
            
            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
			#include "Packages/zzwater/shaders/libs/WaveObj.hlsl"

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

            struct Varyings
            {
                float4 positionHCS : SV_POSITION;
                float2 uv : TEXCOORD0;
                float4 color : TEXCOORD1;
            };


            CBUFFER_START(UnityPerMaterial)
            float4 _MainTex_ST;
            float3 _TineColor;
            half _SwayFreq;
            half _SwayIntensity;
            float4 _WaterDir;
            CBUFFER_END

            TEXTURE2D(_MainTex);
            SAMPLER(sampler_MainTex);


            Varyings vert (Attributes v)
            {
                Varyings o;
                float3 displacement;
                v.positionOS.xyz += GetObjWaveDisplacement(v.positionOS, _WaterDir, _SwayFreq, _SwayIntensity, v.color.a);
                
                o.positionHCS = TransformObjectToHClip(v.positionOS.xyz);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                o.color = v.color;
                return o;
            }

            half4 frag (Varyings i) : SV_Target
            {
                half4 albedo = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv);
                clip(albedo.a - 0.5);
                return half4(albedo.rgb * _TineColor, 1.0);
            }
            ENDHLSL
        }
    }
}