Shader "URP/RimLightAdd"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _TintColor ("texColor", Color) = (0.5,0.5,0.5,1)
        _fangwei ("fangwei", Float ) = 0
        _Fcolor ("Fcolor", Color) = (0.5,0.5,0.5,1)
        _liangdu ("liangdu", Float ) = 0

    }
    SubShader
    {
        Tags { "RenderPipeline"="UniversalPipline" }
        
        HLSLINCLUDE
        #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
        CBUFFER_START(UnityPerMaterial)
        float4 _MainTex_ST;
        half4 _TintColor;
        half _fangwei;
        half4 _Fcolor;
        half _liangdu;
        CBUFFER_END
        ENDHLSL

        Pass
        {
            Blend One One
            //ZWrite Off

            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
            TEXTURE2D(_MainTex);
            SAMPLER(sampler_MainTex);

            struct a2v
            {
                float4 positionOS:POSITION;
                float3 normal : NORMAL;
                float4 texcoord:TEXCOORD0;
                float4 vertexColor : COLOR;
            };

            struct v2f
            {
                float4 positionCS:SV_POSITION;
                half2 uv:TEXCOORD0;
                float4 posWorld : TEXCOORD1;
                float3 normalDir : TEXCOORD2;
                float4 vertexColor : COLOR;
            };

            v2f vert(a2v v)
            {
                v2f o;    
                o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);     
                o.positionCS = TransformObjectToHClip(v.positionOS);                   
                o.vertexColor=v.vertexColor;
                o.normalDir= TransformObjectToWorldNormal(v.normal);     
                o.posWorld= mul(unity_ObjectToWorld, v.positionOS);
                return o;
            }

            half4 frag(v2f i):SV_TARGET
            {
                half4 renderTex=SAMPLE_TEXTURE2D(_MainTex,sampler_MainTex,i.uv);
                i.normalDir=normalize(i.normalDir);
                float3 viewDirection = normalize(_WorldSpaceCameraPos.xyz - i.posWorld.xyz);
                float3 normalDirection = i.normalDir;
                float3 emissive = renderTex.rgb;
                float3 finalColor = (pow(1.0-max(0,dot(i.normalDir, viewDirection)),_fangwei)*_Fcolor.rgb*_liangdu);
                half4 finalRGBA = half4(finalColor,1);
                return finalRGBA;
            }
            ENDHLSL
        }
    }
}