Laurens-Packages/Packages/com.unity.render-pipelines.high-definition/Runtime/Lighting/Shadow/ShadowBlit.shader

Shader "Hidden/ScriptableRenderPipeline/ShadowBlit"
{
    HLSLINCLUDE
        #pragma target 4.5
        #pragma only_renderers d3d11 playstation xboxone xboxseries vulkan metal switch switch2

        #include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Common.hlsl"
        #include "Packages/com.unity.render-pipelines.core/ShaderLibrary/DynamicScaling.hlsl"
        #include "Packages/com.unity.render-pipelines.high-definition/Runtime/ShaderLibrary/ShaderVariables.hlsl"
    ENDHLSL

    SubShader
    {
        Tags{ "RenderPipeline" = "HDRenderPipeline" }
        Pass
        {
            Name "BlitShadows"
            ZTest Always
            Cull Off
            ZWrite On

            HLSLPROGRAM

            #pragma vertex Vert
            #pragma fragment Frag

            struct Attributes
            {
                uint vertexID : SV_VertexID;
                UNITY_VERTEX_INPUT_INSTANCE_ID
            };

            struct Varyings
            {
                float4 positionCS : SV_POSITION;
                float2 texcoord   : TEXCOORD0;
                UNITY_VERTEX_OUTPUT_STEREO
            };

            TEXTURE2D(_CachedShadowmapAtlas);
            float4 _BlitScaleBias;

            Varyings Vert(Attributes input)
            {
                Varyings output;
                UNITY_SETUP_INSTANCE_ID(input);
                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);
                output.positionCS = GetFullScreenTriangleVertexPosition(input.vertexID);
                output.texcoord   = DYNAMIC_SCALING_APPLY_SCALEBIAS(GetFullScreenTriangleTexCoord(input.vertexID));
                return output;
            }


            float Frag(Varyings input) : SV_Depth
            {
                return SAMPLE_TEXTURE2D_LOD(_CachedShadowmapAtlas, s_point_clamp_sampler, input.texcoord.xy, 0).x;
            }


            ENDHLSL
        }
    }
    Fallback Off
}