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screenshot added by algorithm on 2015-06-07 20:44:06
platform :
type :
release date : june 2015
release party : Flashback 2015
compo : oldskool demo
ranked : 3rd
  • rulez 39
  • is ok 7
  • sucks 0
popularity : 0%
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  • rulez 0.85
alltime top: #2324
added on the 2015-06-07 20:44:06 by algorithm algorithm

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Onslaughts contribution to the Flashback 2015 demo compo

An Amiga OCS demo that can run on anything from an unexpanded 68000 based 512k amiga system (a500) to higher spec AGA machines with 68020+

There were some issues when the demo was played back in the compo.
Amiga hardware in combination with projector caused screen shearing in bright areas of the screen destroying most of the screen and turning it into black and white.

On most CRT's the rightmost edges of the screen should not be displayed. I took into account
Unfortunately the visible area reported by winuae while the projector displayed the whole width showing the artifacts.

The shadow dancer part seemed buggy in the compo machine, large rectangular 32 pixel or so block corrupted all the way on the left side of the screen.
added on the 2015-06-07 20:45:38 by algorithm algorithm
Top stuff!
rulez added on the 2015-06-07 20:55:10 by SnC SnC
Love it. The masters of compression : Cyg on Atari, Algorith on Amiga. Hi! Hi! Hi!
rulez added on the 2015-06-07 20:57:26 by Baudsurfer Baudsurfer
Huge respect for the technical side but overall as a demo it left me cold. Piggie it is then.
- OCS
- 512k
- 68000
- single dd disk

seems enough for you guys. Well done.
rulez added on the 2015-06-07 21:15:50 by Ramon B5 Ramon B5
Nice code as usual but the demo doesn't work for me. The scroller is nice though.
added on the 2015-06-07 22:04:23 by StingRay StingRay
Moment stream shows Algorithm melting Amiga AC power at Flashback party Australia June 7th 2015 with some intensive OCS assembly coding :D speaker after sudden dark screen : "hm...I don't know how I can explain this".
BB Image
Haha I saw this too on the stream..
Absolutely fantastic, wow!!!!!! That's something I'll run on the real thing.
I loved every bits of it.
rulez added on the 2015-06-08 00:27:20 by Buckethead Buckethead
yet another nice tech demo from you, so thumb up.
rulez added on the 2015-06-08 01:09:06 by bonefish bonefish
make my day :) nice one!
rulez added on the 2015-06-08 08:37:38 by unity1 unity1
Impressive!! :)
rulez added on the 2015-06-08 08:39:24 by Sir_Lucas Sir_Lucas
Wow. Nice packing.
rulez added on the 2015-06-08 10:26:46 by leGend leGend
shows algorithm's packing skills once again. i really like adam's chip tune at the end too
rulez added on the 2015-06-08 19:45:06 by rudi rudi
Techy, yummy !
rulez added on the 2015-06-08 21:30:32 by Cyg_BLaBla Cyg_BLaBla
rulez added on the 2015-06-08 21:38:14 by HellMood HellMood
Hehe, very good work.
Thanks!
rulez added on the 2015-06-08 23:12:30 by YERZMYEY/H-PRG YERZMYEY/H-PRG
Awesome. Big thumbs up for your first amiga demo. We want to see more
rulez added on the 2015-06-09 00:35:15 by reload reload
As always: technical greatness and shit content.
added on the 2015-06-09 10:35:56 by Preacher Preacher
Technical greatness is content of course.

But you should spend another second thinking about what you feed your algorithms. You're not even showcasing what your algorithm could do. Do some non-repetitive music at least. Ask someone to select the colors or something. What sense does it make to waste all your algorithms with shit like this.
rulez added on the 2015-06-09 15:04:57 by yzi yzi
Looked great on the CRT at the party :-) (which was set up to the left of the projector) I was the person that ran to the back of the room and mashed at the Sony scan converter input stage (pulled down gain, pushed up blacks a little, enabled overscan... which I think was only at 1% or so). When they re-ran it, it got though most of the demo on the bigscreen A-OK, but the CRT got though all of it both times. It was the only tech issue for the whole party. Which is funny - because they tested the Amiga before the compos and ran several demos without issue. So congrats on being the demo that only worked on a CRT :-P

Great content though. Considering how much space the music takes up vs. video it's a miracle you could get that much motion in there. Super impressive demo of skills and an OCS pushed to it's limits :-) I personally thought it was a good choice of content considering the era of the system. Very fitting.
rulez added on the 2015-06-09 17:50:08 by cTrix cTrix
Maybe the content is so trivial because it highlights the algorithms. The routines are the only thing here, so content is given zero thought, so it's clear where the viewer should focus.

But still, to me it seems that the sound routine cannot really compress free audio because the music consists of a two-second loop or something.
added on the 2015-06-10 13:59:18 by yzi yzi
Technical impressive :)
rulez added on the 2015-06-13 16:41:47 by SaphirJD SaphirJD
Every platform needs some Sandra
rulez added on the 2015-06-14 08:50:17 by Harekiet Harekiet
Too accomplished to not give a thumb. As someone else said, cold but amazing.
rulez added on the 2015-06-15 07:58:47 by iTeC iTeC
A lot of tech and effort there, but please consider if you actually want to make those lame boobie videos your trademark :/
rulez added on the 2015-06-15 08:42:23 by Marq Marq
Maybe he just likes boobies?
rulez added on the 2015-06-15 09:11:30 by Serpent Serpent
What's wrong with boobs?
rulez added on the 2015-06-15 09:57:22 by lsl lsl
impressive tech.
rulez added on the 2015-06-17 23:05:14 by zerkman zerkman
It's Desire, yes? Isn't it Razor1911, yes?
rulez added on the 2015-06-19 16:42:01 by 100bit 100bit
hot stuff! ;)
rulez added on the 2015-06-19 17:10:16 by GΞN7LΞM4N GΞN7LΞM4N
It was OK.
added on the 2015-06-20 19:48:42 by AntDude AntDude
Juvenile flashback in there :)
rulez added on the 2015-06-21 02:59:44 by Triace Triace
Thumb goes for the tech
rulez added on the 2015-06-28 12:29:08 by Sir Sir
Technically impressive!
rulez added on the 2015-06-29 00:53:17 by Daniel Daniel
Compression magic from Algorithm, cool chip tune from Adam.
rulez added on the 2015-06-29 10:25:35 by drift drift
thumb for tech...
rulez added on the 2015-07-04 14:56:02 by baah baah
what sensenstahl said
added on the 2015-07-04 15:16:06 by Frequent Frequent
Tech Awesome. Thumb Earned! :)
rulez added on the 2015-07-08 14:52:15 by FunkyM FunkyM
Really good. Good music (your "Diamond' is a really great chippy, Adam!)

Would be, imo, visually a way better with repixeled gfx (logos and some girls), and not with only conversions.
rulez added on the 2015-07-21 09:58:58 by sim sim
This rules! I enjoyed very much the compressed videos. Is it possible to have some technical details about it ?

How much time does it takes to compress, what is the idea behind the compression? Is it something like cutting the frames into a reduced subset of 8px by 8px blocs reused all over the several consecutive frames of the clips ? (like the one you used in http://www.pouet.net/prod.php?which=63649)
rulez added on the 2015-07-30 19:21:47 by __sam__ __sam__
top!
rulez added on the 2015-07-30 23:17:07 by lvd lvd
Some quick tech details about this production.

The music playing throughout utilised sequence based VOA (Variable offset amplitude decode) Its a lossy dictionary based method that also increases the dictionary data via multiple amplitude adjustments in order to recreate the audio.

The first section is at a pack rate of 4:1 but with sequencing this gives approximately 10:1 or so. The second section (Sandra audio) is at a pack rate of 8:1 and overall with sequencing around 14:1

The video parts utilise my variant Vector quantization based on hill-climbing/genetic encode methods. This overall gives less error than E-LBG (Enhanced LBG) by allowing clustering and refinements over not just entire 8x8 blocks, but also 4x4,4x2,2x4,2x2 and 1x1

In order to increase compressibility, the decode stretches the 8x8 blocks to 16x8 with stretching in Y axis and lookups converted to x2 horizontal resolution. A noise layer as well as some copper based shifting is also used to try and minimise visual blockiness. Pack rate (for the Sandra part is approximately 20-190 bytes per frame. This is also further resequenced (many repeating parts)

The stretch scroller utilises mapping color registers (unrestricted 12bit) to variable bitmap pointers that map the color data to the pattern

The XY-Tech tech part utilised hardware registers and bitmap pointer adjustments to the vertical and blitter for the X position. This is rather crude. Could have made it more smooth, but ideally would have been much faster if strip data was precalculated. this was not a possibility to use this to good effect as the whole demo was designed to run on 512k amiga with the music occupying a permanent 256k or so chunk in ram

single pixel unrestricted mode is basically copper chunky using just $dff180 register but offset at shifted positions per odd line and then on the next field, the shifts swapped over. this somewhat gives it a virtual 4x4 look. The video data is interpolated to double the size and then mapped over to the copper.

The shadow dancer is a quick single color video variant of VQ again using noise layer and planar shifted frames to give the shadow effect.

The cycling tunnel animation is a single color animation but using mapped planar offsets with mask layer.

The credits intro part again is based on stretched VQ without a noise layer. There is a noticeable bug on a real amiga where sprites are displayed on the right edges when they should not be (it was displaying fine in WinUAE, where I used this to test the demo, hence released this way) Since then, WinUAE has been updated to show the glitch (as well as fixing the bitplane dma bug that occurred in the stretch scroller part.

Developing the demo to run on 1mb system would have given more possibilities in particular for large code-tables to speed up parts immensely, but decided to go along with fitting it all in 512k instead.
added on the 2015-08-05 18:35:56 by algorithm algorithm
Massively a great tech demo! Packing in place is quite impressive... very well done.
rulez added on the 2015-08-28 17:40:16 by norecess norecess
How? How could I miss this demo? It's a total awesomeness!
rulez added on the 2015-09-11 12:50:11 by Factor6 Factor6
I like it.
rulez added on the 2015-09-25 01:27:48 by estrayk estrayk
Hey, is there a WHDLoad version already?
added on the 2015-09-26 19:36:31 by Factor6 Factor6
Great prod! Is it possible to get mod from endpart? (diamond.mod made by Adam)
added on the 2015-10-18 14:58:05 by adv adv
Massive!
rulez added on the 2017-01-23 20:01:56 by venex venex
If there is algorithm there are always chicks ;) besides the super tech and the show is guaranteed.
Great!
rulez added on the 2017-07-12 16:50:42 by AlienTech AlienTech
Cute
rulez added on the 2017-07-24 07:28:31 by BiTL BiTL

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