Comments on: Screensavr

By: Simon

Simon — Mon, 11 Jun 2007 10:37:12 +0000

Hi Rasmus - thanks for your comments and example code. Your screensaver is far more advanced than mine! Love the ‘providers’ idea, makes a lot of sense and something I could easily implement as I have a similar mechanism already.

I am just learning Objective C, this is really my first effort. I have talked to other programmers about using Core Graphics - at the moment I’m just using NSImage as my way of ‘getting it to work’… I wouldn’t dare show you the source…

Also interesting that you mention Quartz Composer; I hadn’t seriously thought it could so something like this but might be worth giving it a go. If you know of any good online Quartz Composer learning resources I’d love to know.

Thanks again.

By: Rasmus

Rasmus — Mon, 11 Jun 2007 10:26:24 +0000

And! Have a look at “Display Links” - very good for rendering synchronized with display hardware.

By: Rasmus

Rasmus — Mon, 11 Jun 2007 10:22:57 +0000

Great id�a! But the performance is really bad (low framerate and high CPU load)
Ive had some (alot) experience with 2D pixel pushin on the mac os. Take a look at this (unfortunately dead) project; http://trac.hunch.se/PhotoFeeder , where we had to do alot of performance tweeking. You will want to have a look at this in particular: http://trac.hunch.se/PhotoFeeder/browser/trunk/Core/PFMain.m#L637

Using Quartz Composer was actually the best alternative, both considering performance and ease of use. We met one of Apples 2D/3D developers actually, and he also recommended using QC before implementing everything yourself in OpenGL (as we did earlier).

By: gabes

gabes — Wed, 07 Mar 2007 16:06:40 +0000

Hey mate, it runs great, but on 2 screens, i’m getting weird occurrences where the same image will show twice, even three times in a row.

Performance is great though, running on 2 monitors with high quality images, it’s as smooth as a pedo in a chat room.