Shader "zzwater/testshader"
{
    Properties
    {
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _SwayFreq("Sway Frequency", Range(0,10)) = 1.0
        _SubFreq("sub Frequency", Range(0,100)) = 1.0
        _SwayIntensity("Sway Intensity", Range(0,2)) = 0.1
        _WindDir("Wind Direction", Vector) = (1,0,0,0)
    }

    SubShader
    {
        Tags 
        { 
            "RenderType" = "Opaque"
            "RenderPipeline" = "UniversalPipeline"
            "UniversalMaterialType" = "Lit"
            "IgnoreProjector" = "True"
        }
        LOD 300

        Pass
        {
            Name "ForwardLit"
            Tags { "LightMode" = "UniversalForward" }
            ZCLIP On
            
            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile _ _MAIN_LIGHT_SHADOWS
            
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"

            struct Attributes {
                float4 positionOS : POSITION;
                float2 uv : TEXCOORD0;
                float3 normalOS : NORMAL;
                float4 color : COLOR;
            };

            struct Varyings
            {
                float4 positionHCS : SV_POSITION;
                float2 uv : TEXCOORD0;
                float3 normalWS : TEXCOORD1;
                float4 color : TEXCOORD2;
                float r1 : TEXCOORD3;
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;
            half _SwayFreq;
            half _SubFreq;
            half _SwayIntensity;
            float4 _WindDir;

            Varyings vert (Attributes v)
            {
                Varyings o;
                o.positionHCS = TransformObjectToHClip(v.positionOS.xyz);
                o.normalWS = TransformObjectToWorldNormal(v.normalOS);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                o.color = v.color;
                //o.r1 = dot(unity_ObjectToWorld[3].xyz, 1);;

                float3 positionWS = TransformObjectToWorld(v.positionOS.xyz);
                o.r1 = frac(dot(positionWS, 1));
                return o;
            }

            half4 frag (Varyings i) : SV_Target
            {
                half4 albedo = tex2D(_MainTex, i.uv);
                //clip(albedo.a - 0.5);
                return half4(i.r1,0,0, 1.0);
                return half4(albedo.rgb, 1.0);
                //Light mainLight = GetMainLight(TransformWorldToShadowCoord(i.positionHCS));
                
                // 简易光照模型[^2]
                //half3 diffuse = mainLight.color * saturate(dot(i.normalWS, mainLight.direction));
                //return half4(albedo.rgb * diffuse, 1.0);
            }
            ENDHLSL
        }
    }
}