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scaling a texture in HLSL about arbitrary center

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Im trying to scale a texture around an arbitrary center point in a shader...


to try to be more clear, if you want to scale around a center point of a texture normally you can  do something like this:


float2 scaleCenter = float2(0.5f, 0.5f);

centercoord = (In.tex.xy - scaleCenter.xy) * scale + scaleCenter.xy;


however, I want to do this with a longer texture that's scaled already like this : tex.x/=8.0f... tex.x+=x/8.0f (where x is 0 to 8 .... the particular block I want to show)  ...this is so I can pack a bunch of textures into one.


ok, but I still want to then scale the result about its own center point...


I hope this makes sense...


I tried something like this: 

float2 scaleCenter = float2(0.5f, 0.5f)/float2(8.0f,1);



but not working right...can someone help?







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