[hpsdr] Heterodyne for iPad and Hermes Video

[Jeremy McDermond]

On Apr 11, 2012, at 9:16 AM, Hermann wrote:

> I've never used OpenGL ES before, but these infos are good to know.

It's just different enough to be frustrating.  Just know you're in for a ride if you try to use 2.0.  Most of the functions are there and named the same thing, but are limited in a number of ways.

> Recently I got rid of all the GLU dependencies, because it is not continued, afaik.

I wasn't aware that the GLU functions were deprecated.  I was only using gluOrtho2D as a short cut to get the view portal and coordinate system resized correctly for what amounts to fast 2D drawing.

> That wasn't too bad. I also make heavy use of vertex arrays, cause its simply more efficient.

I migrated in my mainline code a while ago and it sped things up a bit.  Since you process the samples in blocks, it makes a certain amount of sense to send those blocks out for drawing as a unit as well.  On the waterfall one of the vertex arrays never changes, so only copying it up once saves a few cycles.

> So I have to think about an iPad :-) soon after my Hermes board is completed!

They're cool little devices, and I'm pretty impressed with how much processing power is under the hood so far.  Of course, I haven't tested everything completely so it could suck your battery life like a swollen tick.

> 73, Hermann

--
Jeremy McDermond (NH6Z)
Xenotropic Systems
mcdermj at xenotropic.com



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