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Forum: Retrogaming General Discussion 18 January 2022, 14:53
Replies: 85
Views: 14,316
Posted By roondar
I agree with this. In my opinion (strengthened by...

I agree with this. In my opinion (strengthened by reading interviews, reading the Brian Bagnal books and hearing old Commodore people talking over the years and programming for it recently), the AGA...
Forum: Amiga scene 14 January 2022, 12:00
Replies: 59
Views: 3,714
Posted By roondar
It's good to see you write this, starting with...

It's good to see you write this, starting with realistic expectations is a very good idea :great

As for the platform discussion, I'd say that depends on what you want to achieve. If you have no...
Forum: Coders. General 11 January 2022, 21:18
Replies: 43
Views: 1,716
Posted By roondar
If the source is already masked out, then you can...

If the source is already masked out, then you can indeed do that. Mind you, given you still need 3 sources and one destination this would not speed up anything as the Blitter speed is primarily based...
Forum: Amiga scene 11 January 2022, 21:12
Replies: 41
Views: 3,755
Posted By roondar
I thought the A2500 was sold with a full 68020...

I thought the A2500 was sold with a full 68020 CPU card. Whether or not that is a 'true' Amiga model is a different kettle of fish, but it's there.
Forum: News 11 January 2022, 21:11
Replies: 90
Views: 4,794
Posted By roondar
Congrats :)

Congrats :)
Forum: Amiga scene 11 January 2022, 19:00
Replies: 41
Views: 3,755
Posted By roondar
The one in the A1200 (68EC020) is indeed limited...

The one in the A1200 (68EC020) is indeed limited to 16MB, but a full 68020 would be limited only to 4GB.
Forum: Coders. General 11 January 2022, 17:46
Replies: 6
Views: 455
Posted By roondar
I guess it's because using the Copper is simply...

I guess it's because using the Copper is simply easier, certainly if the timing is critical and you want compatibility across CPU types/speeds. But you're absolutely correct that the CPU can do...
Forum: Amiga scene 11 January 2022, 15:30
Replies: 41
Views: 3,755
Posted By roondar
I'll grant that finding use for the Blitter will...

I'll grant that finding use for the Blitter will be hard given this method, but it's not entirely impossible for it to still be useful in some minor way. Basically, my idea is to try and find use for...
Forum: Amiga scene 11 January 2022, 10:57
Replies: 41
Views: 3,755
Posted By roondar
System friendly or not, not using...

System friendly or not, not using Sprites/Blitter/Copper at all is a waste even if you do render from Fast RAM. Blitter perhaps less so (though it should be doable to give it something to do while...
Forum: Coders. General 11 January 2022, 10:49
Replies: 6
Views: 455
Posted By roondar
I've assumed a 320 pixel wide screen without...

I've assumed a 320 pixel wide screen without scrolling to make things easier to explain (as the actual total number of colours that can be changed differs based on horizontal display width when using...
Forum: Coders. General 10 January 2022, 23:21
Replies: 43
Views: 1,716
Posted By roondar
Note that there is nothing wrong with the...

Note that there is nothing wrong with the approach you chose, it just wasn't what I had expected. If you want to use two modolu's like that with the CPU blit code, well... Why not? :great
Yup,...
Forum: Coders. Asm / Hardware 10 January 2022, 23:17
Replies: 32
Views: 6,179
Posted By roondar
Setting the pointers only once means that my...

Setting the pointers only once means that my guess can't be it.

I'm with paraj on this one: check to make sure you really do have raster time free (what is the CPU doing all frame, mostly just a...
Forum: Coders. Asm / Hardware 10 January 2022, 15:54
Replies: 32
Views: 6,179
Posted By roondar
Right, I should've been more clear - this holds...

Right, I should've been more clear - this holds for updates to the bitplane shift registers/pointers in the Copper list as well. If those are done through the Copper list, what I said could still...
Forum: Coders. General 10 January 2022, 15:51
Replies: 43
Views: 1,716
Posted By roondar
Right, I see what you mean... The thing is,...

Right, I see what you mean...

The thing is, the Blitter doesn't have two modulo's per channel, only one. So my translation into a soft-blitting approach also didn't. Instead, when blitting...
Forum: Coders. General 10 January 2022, 12:52
Replies: 43
Views: 1,716
Posted By roondar
Basically, yes (though the exact split that...

Basically, yes (though the exact split that performs best is probably not 50/50 on 68000 as the CPU has slightly more overhead, not sure off the top of my head what the best split is for clearing -...
Forum: Coders. General 10 January 2022, 12:26
Replies: 43
Views: 1,716
Posted By roondar
This is only faster when you overwrite with a...

This is only faster when you overwrite with a constant register and only works if the Blitter is doing the same operation (i.e. D channel only blit with BLTADAT set to the pattern you wish to use to...
Forum: Coders. General 10 January 2022, 12:12
Replies: 43
Views: 1,716
Posted By roondar
I mean zeroing out everything in a square (though...

I mean zeroing out everything in a square (though technically you can use any 16 bit pattern, so it doesn't need to be zero). This is faster if you do part of it with the CPU while you also run the...
Forum: Coders. General 10 January 2022, 11:40
Replies: 43
Views: 1,716
Posted By roondar
100% positive. The reason for the 1024 pixel...

100% positive. The reason for the 1024 pixel limit is purely due to the BLTSIZE register only supporting a width of 64 words, it has nothing to do with the modulo values (which can go up much...
Forum: Coders. Asm / Hardware 10 January 2022, 11:36
Replies: 32
Views: 6,179
Posted By roondar
This sounds like it might be a 'race condition'...

This sounds like it might be a 'race condition' to me. When do you update the Copper pointers?

See, it's possible the interrupt for the mod player moves the CPU writes to the Copper/Copperlist...
Forum: Coders. General 10 January 2022, 00:32
Replies: 43
Views: 1,716
Posted By roondar
Ah, I hadn't read that part.. Well, that info is...

Ah, I hadn't read that part.. Well, that info is not correct, the Blitter & Bitplane Modulo values are signed 16 bit one values measured in bytes, meaning you can skip up to 32768 bytes per line (on...
Forum: Coders. General 10 January 2022, 00:01
Replies: 43
Views: 1,716
Posted By roondar
You can blit on screens up to 1008 pixels wide on...

You can blit on screens up to 1008 pixels wide on OCS systems and using the new ECS/AGA Blitter registers up to 32768 pixels wide on those. Interleaved vs non-interleaved blitting does not change...
Forum: Coders. Asm / Hardware 09 January 2022, 23:58
Replies: 32
Views: 6,179
Posted By roondar
The DMA debugger shows which DMA source is...

The DMA debugger shows which DMA source is accessing which cycle in Chip Memory on a frame by frame basis. Very useful to see what is doing what and how fast/slow parts of your code are.

Anyway,...
Forum: Coders. Asm / Hardware 09 January 2022, 16:22
Replies: 32
Views: 6,179
Posted By roondar
If your code is already close to the limit of...

If your code is already close to the limit of what can be done in a frame, audio cycles can cause indeed you to overrun. Audio DMA uses more cycles when there's more channels and/or higher sample...
Forum: Coders. General 09 January 2022, 15:33
Replies: 43
Views: 1,716
Posted By roondar
To clarify, on the A500 combining Blitter & CPU...

To clarify, on the A500 combining Blitter & CPU won't get you performance for copying or cookie-cut operations, but you can use the CPU + Blitter to make clear operations much faster (which can be...
Forum: Coders. General 08 January 2022, 19:36
Replies: 43
Views: 1,716
Posted By roondar
I did a mixed CPU/Blitter approach for AGA...

I did a mixed CPU/Blitter approach for AGA systems (well, the A1200 at any rate) a while back. You can get the source code and a description of how I did it here:...
Forum: Retrogaming General Discussion 24 December 2021, 17:39
Replies: 84
Views: 5,579
Posted By roondar
I only recently discovered her games and they all...

I only recently discovered her games and they all ooze quality. Great, great stuff. So I had no problems at all convincing myself to also get Snow Force :D
Forum: Retrogaming General Discussion 23 December 2021, 16:14
Replies: 84
Views: 5,579
Posted By roondar
Considering how I'm usually aiming my Amiga stuff...

Considering how I'm usually aiming my Amiga stuff at either A500 with at most a trapdoor 512KB expansion or the A1200 without any extra memory/turbo cards... Well, I get what you mean. Then again,...
Forum: Retrogaming General Discussion 21 December 2021, 18:23
Replies: 84
Views: 5,579
Posted By roondar
On topic, the only choice I find a little bit odd...

On topic, the only choice I find a little bit odd is the choice to go for the much slower PAL music rather than the NTSC music speed. That would've made quite the difference I think.

Also, it's...
Forum: Retrogaming General Discussion 21 December 2021, 17:52
Replies: 84
Views: 5,579
Posted By roondar
Ah, I see. Well, they're right about the Sprite...

Ah, I see. Well, they're right about the Sprite hardware - like I said, the C64 can display more Sprite pixels per scanline than the NES. But there's a lot more to a system than just how many Sprite...
Forum: project.WHDLoad 21 December 2021, 17:11
Replies: 9
Views: 1,408
Posted By roondar
I can confirm, the amigashop.org version offers...

I can confirm, the amigashop.org version offers 'unlimited downloads' straight from your account page.
Forum: Amiga scene 21 December 2021, 17:10
Replies: 241
Views: 37,141
Posted By roondar
Well, it took me the better part of two years,...

Well, it took me the better part of two years, but I finally managed to buy the game. Amiga Bill's stream reminded me that I forgot to get this one and I'm hoping to get all three in the end...
...
Forum: project.Amiga Game Factory 21 December 2021, 16:57
Replies: 373
Views: 48,339
Posted By roondar
I thought that the Bruce Lee characters movement...

I thought that the Bruce Lee characters movement on the title screen was 'out of sync' to generate a feeling of depth. That's what it looks like to me anyway.
Forum: Retrogaming General Discussion 21 December 2021, 16:52
Replies: 84
Views: 5,579
Posted By roondar
Interesting, I've never actually thought about...

Interesting, I've never actually thought about the C64 as inherently superior to the 8 bit consoles. When I look at the best NES games vs best C64 games (from a tech perspective) I rather get the...
Forum: Nostalgia & memories 17 December 2021, 18:17
Replies: 46
Views: 3,294
Posted By roondar
1. What systems/OS's did you start with ? The...

1. What systems/OS's did you start with ?
The first computer I used at home was a Sinclair ZX-81, followed by a Sinclair QL. The first computer I owned myself was a Commodore 64.

2. What brought...
Forum: support.Games 14 December 2021, 00:34
Replies: 92
Views: 6,947
Posted By roondar
Oh, by the way - just one detail I did want to...

Oh, by the way - just one detail I did want to add because my last few posts might have given the wrong idea: make no mistake, I actually really like the SNES and it's games :)
Forum: support.Games 13 December 2021, 21:08
Replies: 92
Views: 6,947
Posted By roondar
Yeah, that post of mine was a mistake. Sorry....

Yeah, that post of mine was a mistake. Sorry. Anyway, I'm not going to edit it now - that would be rather silly. Instead, I'll just leave the thread and not add more mistakes. Two in one day was...
Forum: support.Games 13 December 2021, 19:43
Replies: 92
Views: 6,947
Posted By roondar
Nah, it's too bad for the SNES PAL users. They...

Nah, it's too bad for the SNES PAL users. They got (usually anyway) better games, but they also got slower versions with massive borders. That was what console user life in the early 1990's was like...
Forum: support.Games 13 December 2021, 18:19
Replies: 92
Views: 6,947
Posted By roondar
Except most of us Amiga users were in PAL land...

Except most of us Amiga users were in PAL land and thus didn't get 60Hz, nor a full screen with the SNES (but we did get the odd full screen Amiga game). The admittedly few Amiga users in NTSC land...
Forum: Coders. Asm / Hardware 10 December 2021, 18:15
Replies: 5
Views: 737
Posted By roondar
Hmm, using Fast Memory to store the mask might...

Hmm, using Fast Memory to store the mask might improve things. And yes, you'd only need to set the mask once per line so you do save some memory reads by the Blitter this way. Still, repeatedly...
Forum: support.Games 10 December 2021, 17:57
Replies: 92
Views: 6,947
Posted By roondar
I don't know about the SNES (though I expect...

I don't know about the SNES (though I expect it'll also allow this), but on the MD you can definitely choose one of the 16 colour palettes per 8x8 tile - this goes for both layers, the Sprites and...
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