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AuthorTopic: Dot-matrix engine for AGA  (Read 740 times)

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Offline saimo

Dot-matrix engine for AGA
« on: April 14, 2019, 02:00:49 PM »
In the past months I've been thinking of some new game concept that would finally put my dot-matrix engine for AGA Amigas to good use. Admittedly, I haven't come up with anything worthy yet, but I've been doing some technical experiments. I thought you might fancy having a look at the latest experiment:


  • the parallax is not obtained by means of pre-rendered separate lines, but by applying perspective to a rectangular texture; this means that the texture can be easily modified/animated on the fly, and also that it doesn't have a size limit;
  • the shadow is not made of a number of precalculated frames, but it's a single bitmap that gets cast in perspective (exploiting the parallax effect) and also with a pseudo-antialias effect;
  • the scrolling is not obtained by changing bitplane pointers, but by redrawing the whole screen: while this steals quite some bandwidth, it allows for a single raster (thus making rendering operations really easy) and eliminates the need to keep/restore dirty regions;
  • the character is not a bitmap, but it's made of 1200 separate dots (which is what allows it to transform into any other shape made of the same 1200 dots);
  • an unexpanded A1200 runs this at full speed (i.e. 50 Hz); it would do so even if there were a second 1200 dots character, although there wouldn't be time to do much more - to gain extra time for an actual game, characters should be plain bitmaps and, if needed, the parallax area could be made a little shorter.
Note that I'm NOT going to make a beat'em up. Again, this is just an experiment.

(The graphics have been derived from assets which are the property of Capcom Co., Ltd.)

Previous video:

« Last Edit: April 14, 2019, 02:52:28 PM by saimo »
The following users thanked this post: F1Lupo

Offline F1Lupo

Re: Dot-matrix engine for AGA
« Reply #1 on: April 14, 2019, 08:24:07 PM »
looks crazy freakish cool 8) ;D
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The following users thanked this post: saimo

Offline golem

Re: Dot-matrix engine for AGA
« Reply #2 on: April 14, 2019, 09:28:31 PM »
Looks really good. My mind boggles at the maths that must be behind that.
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Offline saimo

Re: Dot-matrix engine for AGA
« Reply #3 on: April 14, 2019, 11:08:35 PM »

Thank you :)


Looks really good.


My mind boggles at the maths that must be behind that.

Nothing particularly special, to be honest.