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Search: Posts Made By: Jobbo
Forum: Coders. Asm / Hardware Yesterday, 06:19
Replies: 3
Views: 289
Posted By Jobbo
Old Demoscene Sources

I pulled my old routines from my A1200 and put them up on github for anyone who might find them interesting:


https://github.com/rjobling/Old-Jobbo-Amiga-Code
Forum: Coders. General 23 December 2021, 21:20
Replies: 20
Views: 1,924
Posted By Jobbo
Zero I see what you're saying and I think...

Zero

I see what you're saying and I think it's a really excellent idea.

Likely much better use of bandwidth than dual-playfield.

I could imagine Lotus2 might even manage to squeak out 50hz...
Forum: Coders. Asm / Hardware 22 December 2021, 15:45
Replies: 13
Views: 1,402
Posted By Jobbo
I have it working. And the explanation makes...

I have it working. And the explanation makes sense. I'm just not sure why adjusting the scroll by 10 is my magic number. Doesn't really matter I suppose.

It's only working if I wait for hpos $e0....
Forum: Coders. Asm / Hardware 22 December 2021, 06:46
Replies: 13
Views: 1,402
Posted By Jobbo
From what I can tell adding $a to whatever the...

From what I can tell adding $a to whatever the offset is supposed to be is what's required.

In my 4bitplane test I need to wait for hpos 112 or $00e1 in the wait command.

Seven Sea's is...
Forum: Coders. Asm / Hardware 22 December 2021, 06:21
Replies: 13
Views: 1,402
Posted By Jobbo
Do you have more details about how exactly to fix...

Do you have more details about how exactly to fix the glitch?


For example if bplcon1 is supposed to be $11 it looks like Seven Sea's will set it per line near the hpos start and then set it to...
Forum: Coders. Asm / Hardware 19 December 2021, 07:26
Replies: 8
Views: 666
Posted By Jobbo
For the 255-0 split is there something special...

For the 255-0 split is there something special about waiting for $ffdf versus waiting for $ffe1?
Forum: Coders. Asm / Hardware 19 December 2021, 06:04
Replies: 8
Views: 666
Posted By Jobbo
What I'm really trying to do is modify bplxmod...

What I'm really trying to do is modify bplxmod each line so it'll cause the same line to be repeated 3 times.

I'm trying to set this up so it'll work across both the 128/0 and 255/0 splits. I'm...
Forum: Coders. Asm / Hardware 19 December 2021, 04:37
Replies: 8
Views: 666
Posted By Jobbo
I get that. But I’m still confused why it still...

I get that. But I’m still confused why it still works when my hpos wait is $d7

What you seem to imply is that I would need a wait for the start and one for the end.

What I’d like is just one...
Forum: Coders. Asm / Hardware 19 December 2021, 02:15
Replies: 8
Views: 666
Posted By Jobbo
Copper Wait Masks

Hi

I'm trying to understand as much as possible how the copper wait masks work for some copper loops I'm having trouble with.

What I really don't understand is why some h-positions cause...
Forum: Coders. Asm / Hardware 07 November 2021, 20:06
Replies: 23
Views: 2,895
Posted By Jobbo
I'm in the middle of trying to use copper loops...

I'm in the middle of trying to use copper loops to repeat an arbitrary length pattern starting and ending at arbitrary y locations.

What's tricky with copper loops seems to be that you need to...
Forum: Coders. Asm / Hardware 29 October 2021, 05:34
Replies: 3
Views: 1,232
Posted By Jobbo
Fast rounding code?

Hi

I'm working on something where I need to efficiently round down to the nearest multiple for different rounding values.

This is on 68000 and the rounding values are 2 through 16.

Obviously...
Forum: Coders. Asm / Hardware 22 October 2021, 18:36
Replies: 10
Views: 949
Posted By Jobbo
I found it online myself.

I found it online myself.
Forum: Coders. Asm / Hardware 22 October 2021, 16:30
Replies: 10
Views: 949
Posted By Jobbo
Thanks everyone, I'll see if it's worth using the...

Thanks everyone, I'll see if it's worth using the fixed size version.





Does anyone have a collection of these tips somewhere? Or a good alternative read with lots of ideas.
Forum: Coders. Asm / Hardware 22 October 2021, 16:09
Replies: 59
Views: 5,416
Posted By Jobbo
Ross, thanks for sharing. Do you have any...

Ross, thanks for sharing. Do you have any released demos from the past that I can watch? You always have some good insight on lots of topics, but I don't know of your work.
Forum: Coders. Asm / Hardware 22 October 2021, 06:45
Replies: 10
Views: 949
Posted By Jobbo
Fast switch statement code

I've found the need to write what is essentially a switch case.


Is there a better approach than the one I've got below?

Or is there a cleaner way to specify the same code?


; d1 =...
Forum: Coders. Asm / Hardware 22 October 2021, 06:21
Replies: 59
Views: 5,416
Posted By Jobbo
a/b Where can I see that effect, it sounds...

a/b

Where can I see that effect, it sounds awesome!!!

I always loved those rare rotation effects like in Brian the Lion that used an iterative vertical skew.

Actually, yours sounds like the...
Forum: Coders. Asm / Hardware 21 October 2021, 23:51
Replies: 59
Views: 5,416
Posted By Jobbo
I think that is starting to make sense. ...

I think that is starting to make sense.

"Feedback" is sort of what I meant by "incremental".

I'm still fuzzy on how you are applying it, but maybe one day I'll have a go.
Forum: Coders. Asm / Hardware 21 October 2021, 23:05
Replies: 59
Views: 5,416
Posted By Jobbo
With the incremental approach it seems like you...

With the incremental approach it seems like you could just run a wave of 16 or maybe 8 pixel wide blits through there if that makes sense.

You could do the even columns first with no need to...
Forum: Coders. Asm / Hardware 21 October 2021, 22:59
Replies: 59
Views: 5,416
Posted By Jobbo
Ross, I don't really follow what you are saying. ...

Ross, I don't really follow what you are saying.

Would be curious to see the code or an executable to fiddle with.

Never the less it seems like it'd be possible to reduce the number of blits...
Forum: Coders. General 16 October 2021, 17:34
Replies: 4
Views: 1,226
Posted By Jobbo
There seems to be an awful lot of threads started...

There seems to be an awful lot of threads started that speculate about what could be done on the Amiga. But not a lot of concrete number crunching to ground those discussions in reality.

So, here...
Forum: Coders. General 16 October 2021, 16:07
Replies: 4
Views: 1,226
Posted By Jobbo
This is what Xenon2 does and it’s only 16 colors....

This is what Xenon2 does and it’s only 16 colors. So expect results similar that!
Forum: Amiga scene 13 October 2021, 02:40
Replies: 39
Views: 3,332
Posted By Jobbo
Did anyone mention Thunderhawk by Core Design. I...

Did anyone mention Thunderhawk by Core Design. I didn’t play it enough to know if it was great but it impressed me at the time
Forum: Coders. C/C++ 10 October 2021, 19:30
Replies: 19
Views: 1,735
Posted By Jobbo
Just to add more game developer perspective....

Just to add more game developer perspective. Almost no games use exceptions either. They add a global performance cost not worth paying. Also in a game you don’t really want to handle problems...
Forum: Coders. C/C++ 10 October 2021, 19:03
Replies: 19
Views: 1,735
Posted By Jobbo
One thing that occurs to me is that if you are...

One thing that occurs to me is that if you are implementing a pool of objects then a potentially better approach would be a free list. Since only free objects need to be in the list you can just...
Forum: Coders. C/C++ 10 October 2021, 18:25
Replies: 19
Views: 1,735
Posted By Jobbo
Deimos Your code looks perfectly reasonable as...

Deimos
Your code looks perfectly reasonable as a use of templates and classes to generalize the code and give it a nicer interface than straight C.
There’s really no other magic C++ or the...
Forum: Coders. General 07 October 2021, 22:55
Replies: 19
Views: 2,314
Posted By Jobbo
a/b do you have a demo? Would be curious to see...

a/b do you have a demo? Would be curious to see how well it's working for you.


Pretty sure Quake1's software renderer did something similar. But a Pentium is obviously much faster than a 68000....
Forum: support.WinUAE 01 October 2021, 22:35
Replies: 3
Views: 555
Posted By Jobbo
I just wasn't sure if anything close was already...

I just wasn't sure if anything close was already covered by the gdb support or something else?
Forum: support.WinUAE 01 October 2021, 22:33
Replies: 3
Views: 555
Posted By Jobbo
I don't have anything to propose right now since...

I don't have anything to propose right now since I don't know much about Win32 shared memory or whatever. But if I get to the point that I'd like some added support inside WinUAE I'll be sure you...
Forum: Coders. Asm / Hardware 01 October 2021, 20:25
Replies: 38
Views: 5,986
Posted By Jobbo
My render update is in the interrupt handler...

My render update is in the interrupt handler because the main user mode code needs to churn through other work that isn't easily divided up each frame.

Currently I'm triggering a soft interrupt...
Forum: Coders. Asm / Hardware 01 October 2021, 20:12
Replies: 58
Views: 6,718
Posted By Jobbo
You can't do that. The copper is way too slow. It...

You can't do that. The copper is way too slow. It can change one color every 8 pixels at best.

It sounds like you are overestimating the capabilities of the Amiga and especially the A500, do some...
Forum: support.WinUAE 01 October 2021, 18:41
Replies: 3
Views: 555
Posted By Jobbo
Reading/writing WinUAE Amiga ram areas

I'm aware that Soundy has made a WinUAE scanner that can read tagged memory in the WinUAE process.


https://www.pouet.net/prod.php?which=88184


I'd like to do something similar, reading and...
Forum: Coders. Asm / Hardware 01 October 2021, 16:14
Replies: 58
Views: 6,718
Posted By Jobbo
Yeah, there doesn't seem to be anything about the...

Yeah, there doesn't seem to be anything about the scrolling that you can take advantage of for optimization or simplification. You'll need a generic 8-way capable set up for this game.
Forum: Coders. Asm / Hardware 01 October 2021, 16:08
Replies: 38
Views: 5,986
Posted By Jobbo
Thanks, I mostly wanted to hear if anyone ran...

Thanks, I mostly wanted to hear if anyone ran into problems or had better suggestions.

I successfully got my own version working.

I moved the frame update loop into a level 1 handler which I...
Forum: Coders. Asm / Hardware 30 September 2021, 04:48
Replies: 38
Views: 5,986
Posted By Jobbo
Hi I'm resurrecting this thread because I'm...

Hi

I'm resurrecting this thread because I'm looking to do something alone similar lines.

I have a background thread that's busy doing work as fast as possible.
I also have a frame update...
Forum: Coders. Asm / Hardware 26 September 2021, 21:41
Replies: 5
Views: 705
Posted By Jobbo
Bplcon1 might be nonzero. This register fine...

Bplcon1 might be nonzero. This register fine scrolls odd and even planes.
Forum: Coders. Asm / Hardware 22 September 2021, 18:32
Replies: 13
Views: 1,402
Posted By Jobbo
Thanks for the details! Now I know what I need to...

Thanks for the details! Now I know what I need to do to use more of the right border (In my case avoid using bplcon1). And I will forever be even more impressed by demos that managed more than 6...
Forum: Coders. Asm / Hardware 22 September 2021, 17:35
Replies: 13
Views: 1,402
Posted By Jobbo
Dan I just realized the original question...

Dan

I just realized the original question might not have been clear.

What I'm trying to do is dynamically move a window around into the overlap regions, not just position it in the center.
Forum: Coders. Asm / Hardware 22 September 2021, 17:32
Replies: 13
Views: 1,402
Posted By Jobbo
That's just the standard 320x256 size. Seems...

That's just the standard 320x256 size.

Seems from the old thread Toni linked that you discussed that the right most extent that can scroll without artifacts is fetch:d8 window:c7.

But Toni...
Forum: Coders. Asm / Hardware 22 September 2021, 16:43
Replies: 13
Views: 1,402
Posted By Jobbo
Thanks, doesn't seem like I'm doing anything...

Thanks, doesn't seem like I'm doing anything wrong then.

Will have to check out the workaround you mention in Seven Seas / Andromeda. Do you have details you could share?
Forum: Coders. Asm / Hardware 22 September 2021, 07:23
Replies: 13
Views: 1,402
Posted By Jobbo
Overscan and scrolling, missing pixel columns?

To move a regular 320x256 sized screen around into the overscan area I'm adjusting diwstrt/stop and ddfstrt/stop and also adjusting bplcon1.


However, when moving to the right with certain scroll...
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