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You could possibly simulate various transparency levels by modifing the color of each pixel to be, say, less intense (for a more transparent colour - red becomes pale reddish-pink etc) or more intense (for greater opacity).
Other than that I believe you could store 'pixel' information with your texture (a vector or list that holds only pixels with varying transparency). This would force you to use your own alpha-blitter though - which is probably what you are trying to avoid right? 
AHA!
http://www-cs.intel.com/design/graphics/applnots/alphabln.htm
And the code is at:
http://www.intel.ie/design/graphics/740/swdev/sdk/ablend3d.htm
Yeah yeah its for an older card, but most of it still applies.
-ns
. It doesn't sound like this is possible through D3DX though 
. Or is it? Does D3DX automatically make 4x4x4x4 textures if the device supports it? (assuming your running in 16bit color) --TheGoop
I've been trying to think of how to use textures with each pixel having its own alpha component (for instance, maybe pixel 1 might have 50% transparency while pixel 99 has 75% transparency). Anyway, I went to the all knowing source of great information, err, the SDK Documentation . But the all knowing source of information had no information on the subject.
Does anyone know how would I do this? Is it in the SDK Docs and I just missed it? What if Elvis is alive, and were all dead? If a tree fell on Richard Simmons, would anyone care?
The truth is out there
--TheGoop
