Shader "Unlit URP Shader/sampbur"
{
    Properties
    {
        _BaseColor("Base Color",color) = (1,1,1,1)
        _BaseMap("BaseMap", 2D) = "white" {}
    }
 
    SubShader
    {
        Tags { "Queue"="Geometry" "RenderType" = "Opaque"  "RenderPipeline" = "UniversalPipeline" }
        LOD 100
 
        Pass
        {
            Tags {"LightMode" = "UniversalForward"}
            HLSLPROGRAM
            // Required to compile gles 2.0 with standard srp library
            #pragma prefer_hlslcc gles
            #pragma exclude_renderers d3d11_9x
            
            #pragma multi_compile _ LIGHTMAP_ON
            #pragma multi_compile _ _MAIN_LIGHT_SHADOWS //接受主光源阴影
            #pragma multi_compile _ _MAIN_LIGHT_SHADOWS_CASCADE //投射主光源的阴影
            #pragma multi_compile _ _SHADOWS_SOFT //软阴影
            #pragma multi_compile _ _ADDITIONAL_LIGHTS //附加光源
            
            #pragma vertex vert
            #pragma fragment frag

            #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 normal:NORMAL;
            };
 
            struct Varyings
            {
                float4 positionCS       : SV_POSITION;
                float2 uv               : TEXCOORD0;
                float3 Wnormal          : TEXCOORD1;
                float3 Wpos:TEXCOORD2;
            };
 
            CBUFFER_START(UnityPerMaterial)
            half4 _BaseColor;
            float4 _BaseMap_ST;
            CBUFFER_END
            TEXTURE2D (_BurTexture);SAMPLER(sampler_BurTexture);
            
 
            Varyings vert(Attributes v)
            {
                Varyings o = (Varyings)0;
 
                o.positionCS = TransformObjectToHClip(v.positionOS.xyz);
                o.uv = TRANSFORM_TEX(v.uv, _BaseMap);
                o.Wpos = TransformObjectToWorld(v.positionOS);
                o.Wnormal=TransformObjectToWorldNormal(v.normal);
 
                return o;
            }
 
            half4 frag(Varyings i) : SV_Target
            {
                float3 N=normalize(i.Wnormal);
                float3 V=normalize(_WorldSpaceCameraPos.xyz-i.Wpos.xyz);
                float2 uv=i.positionCS.xy/_ScreenParams.xy;
                half4 c;
                half4 baseMap = SAMPLE_TEXTURE2D(_BurTexture, sampler_BurTexture, uv);
                c = baseMap * _BaseColor;
                //c.rgb = MixFog(c.rgb, i.fogCoord);
                //float _Me=0.6;//干净的透明玻璃漫反射少，所以金属度直接拉满
              
                //间接高光和漫反射
                // float aa=1;
                // BRDFData brdfData;
                // InitializeBRDFData(c,_Me,1,1,aa, brdfData);
                // half3 ambient_contrib = SampleSH(float4(N, 1));
                // float3 ambient = 0.3 * c;// 随便乘个暗的系数
                // float3 iblDiffuse = max(half3(0, 0, 0), ambient.rgb + ambient_contrib);
                // float3 inssp= GlobalIllumination(brdfData,iblDiffuse,1,i.Wpos,N,V);
                // c.rgb+=inssp*0.5;
                return c;
            }
            ENDHLSL
        }
    }
}