void taa(inout float3 old, in float2 id, int2 iResolution)
{
	id *= iResolution;
	id += .5;
    if (any(id <= 1) || any(id >= iResolution - 1))
		return;
		
	// get the neighborhood min / max from this frame's render
    float3 center = lastFrame[id].rgb;
    float3 minColor = center;
    float3 maxColor = center;
    for (int iy = -1; iy <= 1; ++iy)
    {
        for (int ix = -1; ix <= 1; ++ix)
        {
            if (ix == 0 && iy == 0)
                continue;

            float3 color = lastFrame[id + int2(ix, iy)].rgb;
            minColor = min(minColor, color);
            maxColor = max(maxColor, color);
        }
    }

    //center = max(minColor, center);
	//center = min(maxColor, center);
    // get last frame's pixel and clamp it to the neighborhood of this frame
    old = lerp(old, center, 0.4);
}