[SDL] ANNC: parallax-4

[David Olofson]

Parallax Scrolling IV - Overdraw Elimination +
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I just finished playing around with parallax-3, and ended up with a 
version that does the job with less than 30% of the recursions and blits. 
It's working with horizontal runs only, but it still helps a great deal, 
even with the huge 48x48 tiles in 320x240 mode!

	http://olofson.net/mixed.html


Eventually, I might try some 2D algos to scale better to higher 
resolutions and smaller tiles, but before that I'm probably going to play 
around with parallax scrolling in conjunction with partial screen 
updates. (Very interesting performance hack for windowed modes, and other 
targets w/o h/w pageflipping! Unfortunately, it's inherently half broken 
when used with double buffering, but it *might* be useful there as well, 
in some cases.)


But now I'm off home to work on Kobo Deluxe! :-) I've been fixing various 
user interface and appearace stuff lately; scrolling radar, nicer look on 
the displays and radar etc. Depending on where I get this weekend, I'll 
either release 0.4 RSN, or I'll work some more on the audio engine first. 
(Don't worry - there will most probably be some music in 0.4 either way!)

The Spitfire Engine...? (The graphics engine of Kobo Deluxe.) Yeah, it 
just sits there and does the job. Might be time to rip it out and make it 
a documented, stand-alone engine soon. (Actually, I've already started 
documenting some parts of the API.) Of course, there are still missing 
features (mostly stuff that's done by the original XKobo code), but the 
implemented and tested features seem to be rather solid.


//David Olofson --- Programmer, Reologica Instruments AB

.- M A I A -------------------------------------------------.
|      Multimedia Application Integration Architecture      |
| A Free/Open Source Plugin API for Professional Multimedia |
`----------------------------> http://www.linuxdj.com/maia -'
.- David Olofson -------------------------------------------.
| Audio Hacker - Open Source Advocate - Singer - Songwriter |
`-------------------------------------> http://olofson.net -'