Shader "Lux URP/Terrain/Blend Depth Only"
{
    Properties
    {

    }

    SubShader
    {
        Tags
        {
            "RenderPipeline" = "UniversalPipeline"
            "RenderType" = "Opaque"
            "Queue" = "Geometry+1"
        }
        LOD 100


    //  Depth Only in Lit Pass -----------------------------------------------------

        Pass
        {
        Name "ForwardLit"
        Tags{"LightMode" = "UniversalForward"}

            ZWrite On
            ColorMask 0
            Cull Back

            HLSLPROGRAM
            // Required to compile gles 2.0 with standard srp library
            #pragma prefer_hlslcc gles
            #pragma exclude_renderers d3d11_9x
            #pragma target 2.0

            #pragma vertex DepthOnlyVertex
            #pragma fragment DepthOnlyFragment

            // -------------------------------------
            // Material Keywords

            //--------------------------------------
            // GPU Instancing
            #pragma multi_compile_instancing
            
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"

            //  Material Inputs
 
            struct VertexInput {
                float3 positionOS                   : POSITION;
                UNITY_VERTEX_INPUT_INSTANCE_ID
            };

            struct VertexOutput {
                float4 positionCS     : SV_POSITION;

                UNITY_VERTEX_INPUT_INSTANCE_ID
                UNITY_VERTEX_OUTPUT_STEREO
            };


            VertexOutput DepthOnlyVertex(VertexInput input)
            {
                VertexOutput output = (VertexOutput)0;
                UNITY_SETUP_INSTANCE_ID(input);
                UNITY_TRANSFER_INSTANCE_ID(input, output);
                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);

                output.positionCS = TransformObjectToHClip(input.positionOS.xyz);
                return output;
            }

            half4 DepthOnlyFragment(VertexOutput input) : SV_TARGET
            {
                UNITY_SETUP_INSTANCE_ID(input);
                UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
                return 0;
            }

            ENDHLSL
        }

        // This pass is used when drawing to a _CameraNormalsTexture texture
        Pass
        {
            Name "DepthNormalsXXX"
            Tags{"LightMode" = "DepthNormalsXXX"}

            ZWrite On
            Cull[_Cull]

            HLSLPROGRAM
            #pragma exclude_renderers d3d11_9x
            #pragma target 4.5

            #pragma vertex DepthNormalVertex
            #pragma fragment DepthNormalFragment

            // -------------------------------------
            // Material Keywords

            //--------------------------------------
            // GPU Instancing
            #pragma multi_compile_instancing
            
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"

            //  Material Inputs
 
            struct VertexInput {
                float3 positionOS                   : POSITION;
                float3 normalOS                     : NORMAL;
                UNITY_VERTEX_INPUT_INSTANCE_ID
            };

            struct VertexOutput {
                float4 positionCS     : SV_POSITION;
                float3 normalWS       : TEXCOORD0;

                UNITY_VERTEX_INPUT_INSTANCE_ID
                UNITY_VERTEX_OUTPUT_STEREO
            };


            VertexOutput DepthNormalVertex(VertexInput input)
            {
                VertexOutput output = (VertexOutput)0;
                UNITY_SETUP_INSTANCE_ID(input);
                UNITY_TRANSFER_INSTANCE_ID(input, output);
                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);

                output.positionCS = TransformObjectToHClip(input.positionOS.xyz);
                output.normalWS = TransformObjectToWorldDir(input.normalOS, true);
                return output;
            }

            half4 DepthNormalFragment(VertexOutput input) : SV_TARGET
            {
                UNITY_SETUP_INSTANCE_ID(input);
                UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
                
                float3 normal = input.normalWS;
                return float4(PackNormalOctRectEncode(TransformWorldToViewDir(normal, true)), 0.0, 0.0);

            }

            ENDHLSL
        }

    //  End Passes -----------------------------------------------------
    
    }
    FallBack "Hidden/InternalErrorShader"
}