Sine scroller - Page 5

musashi5150 · 26 April 2007, 23:49

That's a nice trick AGN

pmc · 27 April 2007, 10:28

A 1 pixel version of the sinescroll routine is in the zone...

It now has local labels, a loop for the sin blits instead of them being all laid out one after the other (16 was too many to type in!), AGN's cool 'go back to start of any size sin table' amendment (see previous couple of posts) and the commenting has been updated a little.

pmc · 26 June 2008, 13:19

Not too earth shatteringly interesting but I've had some time recently after not having any time at all for a while so I made a little update to my old sine scroller code by adding a speed change routine.

In trying to learn a bit more about address register indirect with offset and index I found some code that had something similar to what's now in my sine scroll routine except I couldn't undertand why they were doing what they were doing in their code. After playing around with little test routines in a debugger I realised that I couldn't understand their code cos it was wrong and didn't actually do what it was supposed to do!

Anyway, working out why their code was wrong gave me enough of an understanding to work out how to do it right so I put a working routine together and stuck it in my sine scroll code.

So, a new version with the speed change routine is in The Zone in case anyone might be interested.

pmc · 05 September 2010, 13:15

Check the attached archive for an updated version of my sinescroller as promised to CmdrVimes. In the archive is:

sinescroller.68k - commented source code
sinescroller.exe - Amiga executable of the source code

Enjoy.

pmc · 05 September 2010, 15:12

Updated version with conditional assembly selectable one, two or four pixel sinus applied to the scroller.

EDIT: New version attached - I found a couple of small optimisations that could be made to the code.

CmdrVimes · 07 September 2010, 14:01

Quote:

Originally Posted by pmc

Updated version with conditional assembly selectable one, two or four pixel sinus applied to the scroller.

EDIT: New version attached - I found a couple of small optimisations that could be made to the code.

Oops - missed this update completely

Have now downloaded and will be examining closely.

Thanks.

pmc · 07 September 2010, 14:06

No probs mate. I hope it's useful to you. If you have questions about anything that's going on in the code that you don't understand then just shout.

Frog · 07 September 2010, 14:38

very well commented source code. Congrats.

Yragael · 28 June 2017, 10:17

Quote:

Originally Posted by pmc

Can anyone explain the method used to apply sine effects to scrollers?

I don't want a source code cos I want to code a routine myself but I don't understand the way they're created.

How do I go about creating a sine table for my code and then use this sine data to effect the displayed bitplane?

Full code for a sine scroller here : http://www.stashofcode.fr/coder-un-s...l-sur-amiga-1/

Explanation are in french, but you won't mind since you can download the code in a ZIP.

Galahad/FLT · 28 June 2017, 10:39

Quote:

Originally Posted by Yragael

Full code for a sine scroller here : http://www.stashofcode.fr/coder-un-s...l-sur-amiga-1/

Explanation are in french, but you won't mind since you can download the code in a ZIP.

Your work lives on

Used quite recently: [ Show youtube player ]

Yragael · 28 June 2017, 11:04

Quote:

Originally Posted by Galahad/FLT

Your work lives on

Used quite recently: [ Show youtube player ]

Nice

Fun part is that this one was coded by "mistake". I wanted to rotate the crab, and missed the point in the equation so instead of rotating, it expanded and shrinked along both axis. Decided that it was nice enough to keep it. Great chip tune by the great Monty. Ah... those Amiga days!

ross · 28 June 2017, 11:10

Quote:

Originally Posted by Yragael

Explanation are in french

Good articles here!
(je peux lire le français sans problèmes majeurs)

Yragael · 30 June 2017, 10:14

Quote:

Originally Posted by ross

Good articles here!
(je peux lire le français sans problèmes majeurs)

Great. Part 2 of the article is online. The remaining parts 3 and 4 are written, bu will be online next wednesday and saturday. Have fun.

StingRay · 30 June 2017, 10:50

Quote:

Originally Posted by Yragael

I wanted to rotate the crab, and missed the point in the equation so instead of rotating, it expanded and shrinked along both axis.

Quite a common bug that a lot of coders have experienced I guess.

Quote:

Originally Posted by Yragael

Great chip tune by the great Monty. Ah... those Amiga days!

Monty's tunes were always awesome. Well, they still are.

deicidal · 01 July 2017, 17:28

Quote:

Originally Posted by Yragael

Nice

Fun part is that this one was coded by "mistake". I wanted to rotate the crab, and missed the point in the equation so instead of rotating, it expanded and shrinked along both axis. Decided that it was nice enough to keep it. Great chip tune by the great Monty. Ah... those Amiga days!

Why a crab, was it symbolic of something?

Yragael · 02 July 2017, 16:40

Quote:

Originally Posted by deicidal

Why a crab, was it symbolic of something?

Drawn from a stencil I made several years before to paint this symbol on a wall. The idea of the symbol came from "Le crabe aux pinces d'or" by Hergé. You know everything!

05 September 2010, 13:15	#84
pmc gone Join Date: Apr 2007 Location: completely gone Posts: 1,596	Check the attached archive for an updated version of my sinescroller as promised to CmdrVimes. In the archive is: sinescroller.68k - commented source code sinescroller.exe - Amiga executable of the source code Enjoy. Last edited by pmc; 21 September 2010 at 17:40.

05 September 2010, 15:12	#85
pmc gone Join Date: Apr 2007 Location: completely gone Posts: 1,596	Updated version with conditional assembly selectable one, two or four pixel sinus applied to the scroller. EDIT: New version attached - I found a couple of small optimisations that could be made to the code. Last edited by pmc; 21 September 2010 at 17:40.

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26 April 2007, 23:49	#81
musashi5150 move.w #$4489,$dff07e Join Date: Sep 2005 Location: Norfolk, UK Age: 42 Posts: 2,351	That's a nice trick AGN

27 April 2007, 10:28	#82
pmc gone Join Date: Apr 2007 Location: completely gone Posts: 1,596	A 1 pixel version of the sinescroll routine is in the zone... It now has local labels, a loop for the sin blits instead of them being all laid out one after the other (16 was too many to type in!), AGN's cool 'go back to start of any size sin table' amendment (see previous couple of posts) and the commenting has been updated a little.

26 June 2008, 13:19	#83
pmc gone Join Date: Apr 2007 Location: completely gone Posts: 1,596	Not too earth shatteringly interesting but I've had some time recently after not having any time at all for a while so I made a little update to my old sine scroller code by adding a speed change routine. In trying to learn a bit more about address register indirect with offset and index I found some code that had something similar to what's now in my sine scroll routine except I couldn't undertand why they were doing what they were doing in their code. After playing around with little test routines in a debugger I realised that I couldn't understand their code cos it was wrong and didn't actually do what it was supposed to do! Anyway, working out why their code was wrong gave me enough of an understanding to work out how to do it right so I put a working routine together and stuck it in my sine scroll code. So, a new version with the speed change routine is in The Zone in case anyone might be interested.

07 September 2010, 14:06	#87
pmc gone Join Date: Apr 2007 Location: completely gone Posts: 1,596	No probs mate. I hope it's useful to you. If you have questions about anything that's going on in the code that you don't understand then just shout.

07 September 2010, 14:38	#88
Frog Junior Member Join Date: Aug 2001 Location: France Posts: 1,385	very well commented source code. Congrats.

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