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Search: Posts Made By: Jobbo
Forum: Coders. Asm / Hardware 26 September 2021, 20:41
Replies: 5
Views: 219
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, 17:32
Replies: 8
Views: 411
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, 16:35
Replies: 8
Views: 411
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, 16:32
Replies: 8
Views: 411
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, 15:43
Replies: 8
Views: 411
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, 06:23
Replies: 8
Views: 411
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...
Forum: Coders. Asm / Hardware 12 September 2021, 15:11
Replies: 9
Views: 677
Posted By Jobbo
Seems to me like the easiest process would be to...

Seems to me like the easiest process would be to have your Amiga exe read a file with the copper list color values and apply them. Then hook that up to some key or button press so you can reload at...
Forum: Amiga scene 09 September 2021, 19:40
Replies: 136
Views: 12,377
Posted By Jobbo
Just noticed The A500 Mini is available for...

Just noticed The A500 Mini is available for pre-order on both Amazon.co.uk and Amazon.com.

Says it'll be available 31st March 2022.

Ordered mine!!
Forum: Coders. Asm / Hardware 07 September 2021, 20:27
Replies: 6
Views: 437
Posted By Jobbo
It's unrelated to shifting. If you're moving...

It's unrelated to shifting.

If you're moving memory forward into an overlapping region then you need to use descending mode.

Otherwise you want to use the normal ascending mode.

If you don't...
Forum: Coders. Asm / Hardware 07 September 2021, 20:06
Replies: 6
Views: 437
Posted By Jobbo
Are you using descending mode for the appropriate...

Are you using descending mode for the appropriate blit?

http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node0120.html
Forum: project.Amiga Game Factory 02 September 2021, 23:24
Replies: 41
Views: 3,111
Posted By Jobbo
Loved Wonderboy. This looks really close! Is it...

Loved Wonderboy. This looks really close! Is it going to run on an A500?
Forum: Coders. Blitz Basic 29 August 2021, 17:04
Replies: 8
Views: 764
Posted By Jobbo
Insertion sort is an easy and fast option if the...

Insertion sort is an easy and fast option if the order doesn't change very much from frame to frame.

Here's an article about c64 sprite multiplexing which explains one use case:
...
Forum: Coders. C/C++ 20 August 2021, 16:07
Replies: 101
Views: 23,938
Posted By Jobbo
If VSCodium allows you to install extensions then...

If VSCodium allows you to install extensions then you can download the latest installer from GitHub.
Forum: Coders. C/C++ 13 July 2021, 20:39
Replies: 28
Views: 2,300
Posted By Jobbo
That's incorrect. All valid FFP numbers have an...

That's incorrect. All valid FFP numbers have an IEEE equivalent.


Here is the original code I had copied which has some comments.


...
Forum: Coders. C/C++ 13 July 2021, 19:30
Replies: 28
Views: 2,300
Posted By Jobbo
As far as I'm aware all the versions we've posted...

As far as I'm aware all the versions we've posted do the best job possible to translate from IEEE to FFP, and a perfect job translating from FFP to IEEE.
Forum: Coders. C/C++ 13 July 2021, 18:55
Replies: 28
Views: 2,300
Posted By Jobbo
For what it's worth I updated my code so it can...

For what it's worth I updated my code so it can generate instances of my ffp class from native floats at compile time and vice versa.

I didn't port the 68000 assembler versions, which seems to be...
Forum: Coders. C/C++ 07 July 2021, 22:35
Replies: 28
Views: 2,300
Posted By Jobbo
Cool! I hadn't considered trying to get it all to...

Cool! I hadn't considered trying to get it all to happen at compile time. But that's pretty awesome that it can be made to work.
Forum: Coders. C/C++ 07 July 2021, 20:35
Replies: 28
Views: 2,300
Posted By Jobbo
I don't know what you mean by "static...

I don't know what you mean by "static initialization of flexible array members"?

Can you show me an example of what you're doing?
Forum: Coders. C/C++ 07 July 2021, 19:38
Replies: 28
Views: 2,300
Posted By Jobbo
I've done something similar. I wrote a...

I've done something similar.

I wrote a wrapper class around the FFP library. Then pulled some helper functions from elsewhere for conversion from and to ieee floats. I also added some trig/math...
Forum: Coders. Asm / Hardware 31 May 2021, 20:23
Replies: 16
Views: 1,903
Posted By Jobbo
You've missed the point. As I said, Sanity...

You've missed the point.

As I said, Sanity Interference is a "Dentro".

It's on a dos disk and the single file executable is 480k.

However, there is so much happening in that demo that it...
Forum: Coders. Asm / Hardware 31 May 2021, 18:13
Replies: 16
Views: 1,903
Posted By Jobbo
Thanks all for the suggestions. I'm probably not...

Thanks all for the suggestions. I'm probably not going to delve into writing my own right now since I don't actually have a pressing need for one yet. But it sounds like it would be fun at some...
Forum: Coders. Asm / Hardware 28 May 2021, 21:30
Replies: 16
Views: 1,903
Posted By Jobbo
Amiga Trackloaders

I've done a modest amount of Amiga coding in the distant past and now again recently.


However, I've only ever made self contained executables or intros.


When targeting a 1meg A500 it seems...
Forum: Graphics 23 May 2021, 23:59
Replies: 3
Views: 1,148
Posted By Jobbo
This is cool! Thanks for sharing, would love to...

This is cool! Thanks for sharing, would love to see more examples.
Forum: Coders. Asm / Hardware 22 May 2021, 06:02
Replies: 38
Views: 4,704
Posted By Jobbo
Thanks for the details. My take-away is that...

Thanks for the details.

My take-away is that I only need 1 wait because I'm setting the nasty bit and I'm only drawing lines!

Wish I hadn't refactored everything to 2 waits a few weeks back! :)
Forum: Coders. Asm / Hardware 20 May 2021, 22:03
Replies: 38
Views: 4,704
Posted By Jobbo
I'm not going to make any guesses. But I...

I'm not going to make any guesses.

But I would like to know if it's possible to get away with one blitter wait in certain situations and what those cases are?
Forum: Amiga scene 18 May 2021, 18:00
Replies: 51
Views: 6,075
Posted By Jobbo
The inline assembler is actually much better than...

The inline assembler is actually much better than most people realize, it's just harder than you'd expect to get it right.

I recommend reading through the docs carefully:...
Forum: Coders. Asm / Hardware 10 May 2021, 20:53
Replies: 2
Views: 910
Posted By Jobbo
Sounds like you just need to restore all the bob...

Sounds like you just need to restore all the bob backgrounds in one first pass.

Then cookie cut all the bobs after that in a second pass.
Forum: Coders. Asm / Hardware 28 April 2021, 19:26
Replies: 8
Views: 1,252
Posted By Jobbo
There's a lot going on there! The shapes...

There's a lot going on there!

The shapes don't seem to do the usual triangle warping so it doesn't seem to be linear interpolation and there are scenes with generic overdraw.

I would guess it's...
Forum: Coders. Asm / Hardware 27 April 2021, 18:24
Replies: 38
Views: 4,704
Posted By Jobbo
Thanks, like you I just followed other examples...

Thanks, like you I just followed other examples back in the day. But now I prefer to know why!
Forum: Coders. Asm / Hardware 27 April 2021, 18:16
Replies: 38
Views: 4,704
Posted By Jobbo
Pink Definitely a good idea to handle...

Pink


Definitely a good idea to handle long frames the way you have, so will probably copy that.


I'll have a think about the use of copjmp1/2. I might be able to do the same since there are...
Forum: Coders. Asm / Hardware 26 April 2021, 16:10
Replies: 38
Views: 4,704
Posted By Jobbo
I've run into this synchronization problem again...

I've run into this synchronization problem again after changing some things around and I realize that I didn't completely fix things last time.

I do have a fix but I don't fully understand why...
Forum: Coders. General 21 April 2021, 17:06
Replies: 12
Views: 2,266
Posted By Jobbo
It's really interesting to hear these features...

It's really interesting to hear these features can work effectively on a 68000.

I'm not sure how I would feel about opening this can of worms on a large project. But since most Amiga projects are...
Forum: Coders. General 19 April 2021, 23:15
Replies: 12
Views: 2,266
Posted By Jobbo
Please make them add the spaceship operator to...

Please make them add the spaceship operator to that list!
Forum: Coders. Asm / Hardware 19 April 2021, 21:14
Replies: 6
Views: 634
Posted By Jobbo
I wonder why disabling D wasn't made so it would...

I wonder why disabling D wasn't made so it would already achieve this.
Forum: Coders. Asm / Hardware 19 April 2021, 20:43
Replies: 6
Views: 634
Posted By Jobbo
Thanks. I was mostly concerned that I was missing...

Thanks. I was mostly concerned that I was missing something important or passing up some extra performance. But seems some demos are either sloppy or purposefully misleading.
Forum: Coders. Asm / Hardware 19 April 2021, 16:02
Replies: 6
Views: 634
Posted By Jobbo
Blitter D channel and fill questions.

I've been poking around at some demos as I try to put together my own blitter fill pass for some polygons.


Some of what I've seen has been surprising.


Firstly I've seen many cases for fills...
Forum: Coders. General 19 April 2021, 15:46
Replies: 12
Views: 2,266
Posted By Jobbo
Very interesting to see co-routines in use on...

Very interesting to see co-routines in use on Amiga. I haven't used them myself in other projects but I've seen the concept used in games at least as far back as 1998.

What is the overhead like...
Forum: Coders. Asm / Hardware 15 April 2021, 15:57
Replies: 39
Views: 2,520
Posted By Jobbo
I gave the latest a go and the cycle times are...

I gave the latest a go and the cycle times are now further off for indexed addressing modes.

I don't have time to look into the details but you might want to take a careful look.

The little...
Forum: Coders. Asm / Hardware 14 April 2021, 17:34
Replies: 13
Views: 1,193
Posted By Jobbo
Yes! Awesome. I need to learn those CC's more...

Yes! Awesome. I need to learn those CC's more thoroughly!
Forum: Coders. Asm / Hardware 14 April 2021, 05:09
Replies: 39
Views: 2,520
Posted By Jobbo
Here are some example that seem wrong based on...

Here are some example that seem wrong based on the timings reported in EASy68k and on this website http://oldwww.nvg.ntnu.no/amiga/MC680x0_Sections/timmove.HTML

These AKAIK should be 14 cycles but...
Showing results 1 to 40 of 208

 
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