Matrix4x4 v = renderingData.cameraData.GetViewMatrix();
Matrix4x4 p = renderingData.cameraData.GetProjectionMatrix();

v.SetColumn(3, new Vector4(0, 0, 0, 1));
Matrix4x4 vpInv = (p * v).inverse;
float near = renderingData.cameraData.camera.nearClipPlane;

Vector3 topLeftCorner = vpInv.MultiplyPoint(new Vector3(-1, 1, -1));
Vector3 topRightCorner = vpInv.MultiplyPoint(new Vector3(1, 1, -1));
Vector3 bottomLeftCorner = vpInv.MultiplyPoint(new Vector3(-1, -1, -1));

Shader.SetGlobalVector(CamPosToNearLeftUpperVec, topLeftCorner);
Shader.SetGlobalVector(NearTopLeftToTopRightVec, topRightCorner - topLeftCorner);
Shader.SetGlobalVector(NearTopLeftToBottomLeftVec, bottomLeftCorner - topLeftCorner);


Pass
{
    HLSLPROGRAM
    #pragma vertex Vert
    #pragma fragment frag
    #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
    #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/DeclareDepthTexture.hlsl"
    #include "Packages/com.unity.render-pipelines.core/Runtime/Utilities/Blit.hlsl"

    float3 _CamPosToNearLeftUpperVec;
    float3 _NearTopLeftToTopRightVec;
    float3 _NearTopLeftToBottomLeftVec;

    float3 ReconstructPositionWS(float2 uv)
    {
        float depth = LinearEyeDepth(SampleSceneDepth(uv), _ZBufferParams);
        float3 positionWSIntersectWithNear =
            _CamPosToNearLeftUpperVec
            + uv.x * _NearTopLeftToTopRightVec
            + uv.y * _NearTopLeftToBottomLeftVec;
        // scalene triangle
        return depth / _ProjectionParams.y * positionWSIntersectWithNear + _WorldSpaceCameraPos;
    }

    float3 frag(Varyings IN) : SV_Target
    {
        return abs(ReconstructPositionWS(IN.texcoord));
    }
    ENDHLSL
}