Add configure option --with-demo=

[GoogleCodeExporter]

Add support to skip demo and its dependencies during 'configure' and to not 
build demo when running 'make'.

Original issue reported on code.google.com by kccon...@gmail.com on 30 Oct 2012 at 2:27

[GoogleCodeExporter]

Fair enough.  However, the dependencies shouldn't pose a build fail.  If you 
don't mind me asking, what''s the primary reason you need this?

Original comment by behdad.e...@gmail.com on 1 Nov 2012 at 10:21

[GoogleCodeExporter]

I built glyphy for iOS. I just needed to link to libglyphy. I refactored 
(hacked) the demo to run on iOS (without GLUT). The repo version of demo won't 
build because GLUT doesn't exist on iOS.

BTW. Demo runs SLOW on my iPod 3G. ~3 FPS

Original comment by kccon...@gmail.com on 1 Nov 2012 at 11:32

[GoogleCodeExporter]

Interesting.  If you have patches of the changes I'd be happy to take them.

Original comment by beh...@chromium.org on 1 Nov 2012 at 11:34

[GoogleCodeExporter]

I'd be happy to give it to you. But its kind of an embarassing mess right now. 
I just wanted to see the performance so I spent an hour or so getting it 
running. I have an Xcode project which is more or less a hacked version of the 
demo files and some platform-specific stuff. I have it linking to libglyphy 
which I am building from the command-line. Nothing that resembles a 'patch' at 
this point.

Original comment by kccon...@gmail.com on 1 Nov 2012 at 11:46

[GoogleCodeExporter]

Right.  That's what I expected.  Would be interesting to see the number on 
iPhone 5.  I'm more interested seeing numbers on Android, and have not got the 
time to port yet.

Original comment by beh...@chromium.org on 1 Nov 2012 at 11:50

[GoogleCodeExporter]

I will try it on the 4S this weekend. Was hoping it would be faster than it 
was. Its too heavy in the fragment shader. I would like to make it faster. :-/ 
You guys working on any major speed improvements?

Original comment by kccon...@gmail.com on 1 Nov 2012 at 11:57

[GoogleCodeExporter]

I'm not actively working on it right now, but may do next year.  However, most 
of my ideas involve reducing texture fetches in exchange of more work in the 
fragment shader :(.  The thing is, I don't have a test environment that is weak 
on the shader operations, so I can't test any change.

On my two testing machines (ThinkPad T530, and Macbook Air), the demo runs at 
over 60fps fullscreen...

Original comment by behdad.e...@gmail.com on 2 Nov 2012 at 12:01

[GoogleCodeExporter]

You can simply try to render the demo geometry X times per frame. Increase X 
until the framerate drops to like 20 fps or something.

Original comment by kccon...@gmail.com on 2 Nov 2012 at 12:10

[GoogleCodeExporter]

So, any chance you can run this on an iPhone5?

Original comment by beh...@chromium.org on 6 Dec 2012 at 7:19