float4 MRUKJumpFlood(MaterialFloat2 UV, Texture2D Tex, SamplerState TexSampler , MaterialFloat StepSize)
{
    float BestDistance = 99999;
    float BestDistance2 = 99999;
    float2 BestUV = float2(-1,-1);
    float2 BestUV2 = float2(-1.0, -1.0);

    for (int y = -1; y <= 1; ++y)
    {
        for (int x = -1; x <= 1; ++x)
        {
            float2 UVOff = UV + float2(x,y) * StepSize;
            float2 TempVaule = Texture2DSample(Tex, TexSampler, UVOff).xy;
            float Dist = length(TempVaule - UV);
            if ((TempVaule.x >= 0) && (TempVaule.y >= 0) && (Dist < BestDistance))
            {
                BestDistance = Dist;
                BestUV = TempVaule;
            }

            float2 TempVaule2 = Texture2DSample(Tex, TexSampler, UVOff).zw;
            float Dist2 = length(TempVaule2 - UV);
            if ((TempVaule2.x >= 0) && (TempVaule2.y >= 0) && (Dist2 < BestDistance2))
            {
                BestDistance2 = Dist2;
                BestUV2 = TempVaule2;
            }
        }
    }

    return float4(BestUV.x, BestUV.y, BestUV2.x, BestUV2.y);
}