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Forum: OT - General 11 October 2019, 17:12
Replies: 2
Views: 104
Posted By roondar
My (kind-of) absence of late

For those who are interested and in the spirit of openness (which usually helps me), I thought I'd write a quick note on why I've been mostly absent for the past few weeks.

The long and short of...
Forum: Coders. Asm / Hardware 11 October 2019, 16:56
Replies: 23
Views: 657
Posted By roondar
Huh, I thought adda.w was ever so slightly...

Huh, I thought adda.w was ever so slightly faster...

Anyway, thanks for the explanation. Makes sense to use .l in all cases if they're the same speed anyway (unless you are naughty and don't clear...
Forum: Nostalgia & memories 11 October 2019, 16:46
Replies: 52
Views: 1,606
Posted By roondar
Seems we still have a long way to go until we can...

Seems we still have a long way to go until we can accept just how overrated 8 & 16 bit consoles and their games are. Let alone modern consoles, which are basically just a poor mans PC. Oh well.
Forum: Coders. Contest 11 October 2019, 16:31
Replies: 1,522
Views: 106,790
Posted By roondar
A very nice box. Might even call it a legendary...

A very nice box. Might even call it a legendary box.
For a legendary effort :)
Forum: Nostalgia & memories 11 October 2019, 16:27
Replies: 52
Views: 1,606
Posted By roondar
<shrug> almost all 'classic' games aren't all...

<shrug> almost all 'classic' games aren't all that good.
So yeah, most Amiga games from the 1980's and 1990's are not all that good.

Main difference between systems is (IMHO) that for the Amiga...
Forum: Coders. Asm / Hardware 11 October 2019, 16:22
Replies: 23
Views: 657
Posted By roondar
Am I missing something here? I thought adding a...

Am I missing something here?
I thought adding a 16 bit signed value to an address register using add.w was safe?

Or is the lesson here that you can forget that the value needs to be in that range...
Forum: Retrogaming General Discussion 20 September 2019, 17:08
Replies: 100
Views: 3,907
Posted By roondar
It's weirder than you think. The MD actually has...

It's weirder than you think. The MD actually has specific screen modes for PAL screens that do use a bigger portion of the screen (240 lines vs the Amiga's 256). It's just that AFAIK no games...
Forum: Coders. Contest 14 September 2019, 23:59
Replies: 1,522
Views: 106,790
Posted By roondar
Grats! That is awesome news!

Grats! That is awesome news!
Forum: Coders. Contest 14 September 2019, 23:23
Replies: 1,522
Views: 106,790
Posted By roondar
DMA cost of my method is high indeed. Copperlist...

DMA cost of my method is high indeed. Copperlist is also large. I'd not actually use it as is in an OCS game - it was more of a thought experiment gone wild than anything else. My hope was that it...
Forum: Amiga scene 06 September 2019, 10:53
Replies: 300
Views: 31,959
Posted By roondar
The full source code (and source data) for...

The full source code (and source data) for Turrican 3 is online somewhere. That might give an indication.
Forum: Coders. General 06 September 2019, 10:00
Replies: 33
Views: 1,234
Posted By roondar
Now we're talking AGA setting anyway, here's the...

Now we're talking AGA setting anyway, here's the way to select banks & select between upper and lower 12 bits. To select the colour bank, use register BPLCON3 ($106). Bits 13-15 select which bank you...
Forum: Retrogaming General Discussion 05 September 2019, 16:12
Replies: 326
Views: 12,022
Posted By roondar
It all depends on what you consider 'good enough'...

It all depends on what you consider 'good enough' in case of porting. I've noticed that a decent number of people in the Amiga community only seem to consider a port worthwhile if it's more or less...
Forum: Coders. Blitz Basic 05 September 2019, 15:12
Replies: 31
Views: 917
Posted By roondar
Yes, many tricks are used. Usually only the...

Yes, many tricks are used. Usually only the programmers or rather observant people notice it.

Still happens to this day - many games (even on PC) don't have full resolution lightning, shadows or...
Forum: Coders. General 05 September 2019, 15:07
Replies: 33
Views: 1,234
Posted By roondar
Life is too short to learn all things. Pick what...

Life is too short to learn all things. Pick what you want to learn and use that.

I do use assembly, but I'm just a gigantic sucker for banging the hardware of retro computers directly. Looking at...
Forum: Coders. General 05 September 2019, 13:05
Replies: 33
Views: 1,234
Posted By roondar
It seems to me the problem here is that 'graphic...

It seems to me the problem here is that 'graphic techniques' and 'coding' are very close on retro platforms like the Amiga ;)
I guess we had indeed moved from 'copper reloading exists' into 'coding...
Forum: Coders. General 05 September 2019, 12:45
Replies: 33
Views: 1,234
Posted By roondar
Yup, AGA is a lot less elegant to code for and...

Yup, AGA is a lot less elegant to code for and has all sorts of alignment restrictions and stuff like colour banking and having to set colours in two writes to worry about. OCS is much nicer to...
Forum: Retrogaming General Discussion 05 September 2019, 12:40
Replies: 326
Views: 12,022
Posted By roondar
I seem to recall a half-finished demo of one of...

I seem to recall a half-finished demo of one of the Raiden games for AGA Amiga's floating about a few years ago. Started back in the day to be an official port, but canceled because of the lack of an...
Forum: Coders. General 05 September 2019, 12:36
Replies: 33
Views: 1,234
Posted By roondar
You're welcome! If you have more questions, I'm...

You're welcome!
If you have more questions, I'm more than happy to help :great

On the topic of colour registers:

Amiga colour registers do not have any form of alpha transparency
AGA...
Forum: Amiga scene 05 September 2019, 11:00
Replies: 190
Views: 16,166
Posted By roondar
I agree fully with the 'atmospheric SFX' crowd....

I agree fully with the 'atmospheric SFX' crowd. If done well it can make a game incredibly tense or exciting. The same can also be done with music, but I prefer the SFX to be able to shine in games...
Forum: Amiga scene 05 September 2019, 10:51
Replies: 300
Views: 31,959
Posted By roondar
To be fair, those tech demos started out because...

To be fair, those tech demos started out because I just love to tinker with stuff and the Amiga chipset offers so much room to tinker with :p
Forum: Coders. Blitz Basic 05 September 2019, 10:40
Replies: 31
Views: 917
Posted By roondar
FYI, I've written working scrollers on the Amiga...

FYI, I've written working scrollers on the Amiga before and have provided several Amiga programs using scrolling, with full source code, on my website. These are also linked to on EAB in several...
Forum: Coders. Blitz Basic 05 September 2019, 10:17
Replies: 31
Views: 917
Posted By roondar
I know :D:D:D Of course, but the idea is...

I know :D:D:D

Of course, but the idea is (obviously) to only blit as much as you need per frame. For 'normal' games you just don't need that many tiles blit per frame to keep up with scrolling....
Forum: Amiga scene 05 September 2019, 10:02
Replies: 300
Views: 31,959
Posted By roondar
Yeah, the problem of getting the basics working...

Yeah, the problem of getting the basics working (such a scrolling screen with some bobs on it) is not that much work and makes it look like you're very far along.

I suppose that's good for...
Forum: Coders. General 05 September 2019, 09:58
Replies: 33
Views: 1,234
Posted By roondar
No problem, happy to help :) Know that I did...

No problem, happy to help :)

Know that I did make a small error in the Copperlist (one of the WAIT commands was not correct) which I have corrected just now.
Forum: Coders. Blitz Basic 05 September 2019, 00:37
Replies: 31
Views: 917
Posted By roondar
Well, a smart person only blits about a block per...

Well, a smart person only blits about a block per frame for the optimal scroller. So that would make it two per frame. Not a big deal really ;)


Yup, it did. And happy to be of service.


I...
Forum: Coders. Blitz Basic 05 September 2019, 00:20
Replies: 31
Views: 917
Posted By roondar
Just a small, friendly warning: what you're doing...

Just a small, friendly warning: what you're doing will eventually likely crash the Amiga as scrolling the display always also means you're moving through memory*. Once you start seeing 'garbage' on...
Forum: Coders. General 04 September 2019, 15:22
Replies: 33
Views: 1,234
Posted By roondar
You're welcome! There's tons more I could...

You're welcome!

There's tons more I could add, including a lot about registers etc. But for now I'll wait and see what people want to know and how much of it fits this thread ;)

That said, I...
Forum: Coders. General 04 September 2019, 14:20
Replies: 33
Views: 1,234
Posted By roondar
Part 3: an example Copperlist Let's look at all...

Part 3: an example Copperlist
Let's look at all this in the form of an example. In this example, I skip the part where the Copper sets up the bitplane pointers and other display setting. I can give...
Forum: Coders. General 04 September 2019, 14:19
Replies: 33
Views: 1,234
Posted By roondar
Part 2: coding WAIT/MOVE instructions Each...

Part 2: coding WAIT/MOVE instructions
Each Copper instruction takes the form of two 16 bit values (called words): one word gives the instruction, the second word gives the parameter for the...
Forum: Coders. General 04 September 2019, 14:18
Replies: 33
Views: 1,234
Posted By roondar
Ok, here's a 'small' overview about the Copper....

Ok, here's a 'small' overview about the Copper. It's still a pretty big chunk of text though, so sit back and enjoy with a beverage of your choice :p

One note before I begin: to keep things...
Forum: Amiga scene 04 September 2019, 00:01
Replies: 190
Views: 16,166
Posted By roondar
I suppose on AGA you could use the Copper and...

I suppose on AGA you could use the Copper and BPLCON4 to have part of the screen in a form of 'compressed copper chunky' and the rest using standard C2P. Should be enough raster time to change 96...
Forum: Amiga scene 03 September 2019, 23:48
Replies: 190
Views: 16,166
Posted By roondar
Yeah, don't bother. He's comparing an A500...

Yeah, don't bother.

He's comparing an A500 to machines that have a CPU that is on the order of 10x faster (or more if he's talking about a 486) and come with much more memory. Strangely, he...
Forum: project.Amiga Game Factory 03 September 2019, 11:58
Replies: 34
Views: 1,381
Posted By roondar
@Marle: since this is far off-topic, I'm not...

@Marle: since this is far off-topic, I'm not going to post about it here - but if you like, I could explain a bit about the basics of how Copperlists work sometime? They're not as complicated as you...
Forum: Coders. Blitz Basic 03 September 2019, 11:46
Replies: 15
Views: 744
Posted By roondar
Thanks for the explanation of queue/unqueue. One...

Thanks for the explanation of queue/unqueue. One of the drawbacks of primarily using assembly is that you don't always know the method used by other environments like Amos/Blitz. So, queue/unqueue...
Forum: Retrogaming General Discussion 03 September 2019, 11:11
Replies: 326
Views: 12,022
Posted By roondar
Strider in EHB would be a big struggle...

Strider in EHB would be a big struggle considering the huge DMA and Blitter cost that comes alongside EHB, though. Don't underestimate just how few bobs you get in that mode - it's not pretty. And...
Forum: project.Amiga Game Factory 03 September 2019, 11:06
Replies: 34
Views: 1,381
Posted By roondar
Very true, that can get quite tricky. The payoff...

Very true, that can get quite tricky. The payoff is pretty good though, so the effort might be worthwhile nonetheless.

I still think that for a painting program it makes sense to implement such a...
Forum: project.Amiga Game Factory 03 September 2019, 10:25
Replies: 34
Views: 1,381
Posted By roondar
It's kind of weird to me no Amiga painting...

It's kind of weird to me no Amiga painting program (or cross platform one) supports colour changes per scanline. It's been part of the IFF spec for many years and should really not be that difficult...
Forum: Coders. Blitz Basic 03 September 2019, 10:21
Replies: 15
Views: 744
Posted By roondar
Interesting... What kind of Blitter command are...

Interesting... What kind of Blitter command are you using in Blitz to clear the bobs?

See, it rather surprises me that the 'colour' matters - a restore/clear blit should not use any mask at all,...
Forum: Amiga scene 03 September 2019, 10:17
Replies: 300
Views: 31,959
Posted By roondar
I tip my hat to you, sir :bowdown It take a...

I tip my hat to you, sir :bowdown

It take a lot of effort to create a bigger game like this. To keep it up over multiple years (probably enduring setbacks along the way) is an accomplishment in...
Forum: Amiga scene 03 September 2019, 10:12
Replies: 190
Views: 16,166
Posted By roondar
This is an extremely cool project. I think it's...

This is an extremely cool project. I think it's pretty amazing to see an engine like this on an A500 and am looking forward to seeing more :)

I've seen several rather negative posts in this...
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