uint BlurCount = 8;
float4 PS_Blur(VertexOutput input) : SV_Target
{
    float2 arr[9] =
    {
        float2(-1, -1), float2(+0, -1), float2(+1, -1),
        float2(-1, +0), float2(+0, +0), float2(+1, +0),
        float2(-1, +1), float2(+0, +1), float2(+1, +1)
    };
    
    float3 color = 0;
    for (uint blur = 1; blur < BlurCount; blur++)
    {
        for (int i = 0; i < 9; i++)
        {
            float x = arr[i].x * (float) blur * PixelSize.x;
            float y = arr[i].y * (float) blur * PixelSize.y;

            float2 uv = input.Uv + float2(x, y);
            color += DiffuseMap.Sample(LinearSampler, uv).rgb;
        }
    }    
    color /= (BlurCount) * 9;   
    
    return float4(color, 1.0f);
}