Sod it!. I've been running that test for hours trying to figure out why I was getting an alpha image.
<edit> Now the timings are identical and I feel a prat.
<edit2> Just realised as well that alphablend is a const 3 so it was setting alpha to 3.0 (i.e. 1.0) so I can't even moan it should have thrown an error.
<edit> Now the timings are identical and I feel a prat.
<edit2> Just realised as well that alphablend is a const 3 so it was setting alpha to 3.0 (i.e. 1.0) so I can't even moan it should have thrown an error.