#define SHADERPASS SHADERPASS_SHADOWCASTER


#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Shadows.hlsl"
//#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/SLZExtentions.hlsl"

// Shadow Casting Light geometric parameters. These variables are used when applying the shadow Normal Bias and are set by UnityEngine.Rendering.Universal.ShadowUtils.SetupShadowCasterConstantBuffer in com.unity.render-pipelines.universal/Runtime/ShadowUtils.cs
// For Directional lights, _LightDirection is used when applying shadow Normal Bias.
// For Spot lights and Point lights, _LightPosition is used to compute the actual light direction because it is different at each shadow caster geometry vertex.
float3 _LightDirection;
float3 _LightPosition;

struct Attributes
{
    float4 positionOS   : POSITION;
    float3 normalOS     : NORMAL;
    UNITY_VERTEX_INPUT_INSTANCE_ID
};

struct Varyings
{
    float4 positionCS   : SV_POSITION;
};


float4 GetShadowPositionHClip(Attributes input)
{
    float3 positionWS = TransformObjectToWorld(input.positionOS.xyz);
    float3 normalWS = TransformObjectToWorldNormal(input.normalOS);

#if _CASTING_PUNCTUAL_LIGHT_SHADOW
    float3 lightDirectionWS = normalize(_LightPosition - positionWS);
#else
    float3 lightDirectionWS = _LightDirection;
#endif
    float2 vShadowOffsets = GetShadowOffsets(normalWS, lightDirectionWS);
    //positionWS.xyz -= vShadowOffsets.x * normalWS.xyz * .01;
    positionWS.xyz -= vShadowOffsets.y * lightDirectionWS.xyz * .01;
    float4 positionCS = TransformObjectToHClip(float4(mul(unity_WorldToObject, float4(positionWS.xyz, 1.0)).xyz, 1.0));
    //float4 positionCS = TransformWorldToHClip(ApplyShadowBias(positionWS, normalWS, lightDirectionWS));

#if UNITY_REVERSED_Z
    positionCS.z = min(positionCS.z, UNITY_NEAR_CLIP_VALUE);
#else
    positionCS.z = max(positionCS.z, UNITY_NEAR_CLIP_VALUE);
#endif

    return positionCS;
}

Varyings vert(Attributes input)
{
    Varyings output;
    UNITY_SETUP_INSTANCE_ID(input);
    output.positionCS = GetShadowPositionHClip(input);

    return output;
}

half4 frag(Varyings input) : SV_TARGET
{
    return 0;
}