Emulate D3D9's StretchRect

I'm porting some code from D3D9 to OpenGL and the D3D9 version uses 
StretchRect to copy the frame buffer (which is usually non pow2) into a 
pow2 texture. How would I do this in OpenGL?

One way I was thinking of was to CopyTexImage2D into a non-pow2 texture 
rectangle and then use a pow2 offscreen-context (the same size as my 
destination pow2 texture) to render the texture rectangle into using a 
simple quad. Then I would CopyTexImage2D into my destination pow2 
texture. That sounds horribly inefficient. Is there a better way?

This will happen a few times per frame, so I don't want to copy the 
background buffer to system memory and do a scale there.

Any ideas are helpful.

- Ray
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Author: Ray Ratelis
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