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#281 | |
Registered User
Join Date: Jul 2014
Location: Warsaw/Poland
Posts: 198
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Quote:
as far as I remember GRIND uses 6bits per chunky pixel and converts it to four bitplanes. Additional bits are used for color interleaving. |
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#282 | |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,938
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Quote:
The actual write and read access to Akiko itself is much faster. On the 030/70, it maxed out the bus. This is why I think an Akiko routine for a 4 plane target is a potential performance win, but at the same time, the way Dread organises it's data may make it difficult to retrofit. |
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#283 | |
Registered User
Join Date: Feb 2017
Location: Denmark
Posts: 1,315
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Quote:
This makes good use of the blitter passes to shuffle things back from the "scrambled" column layout to a more normal one for free while doing the C2P steps. For the purposes of this thread I think it means Akiko will be close to useless. However maybe in the (very) long run the Grind team will optimize for 030+ (where blitter C2P isn't the best approach) in which case another chunky buffer layout might be on the table, and it can be revisited. But obviously A500 first ![]() |
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#284 |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,938
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Wildcard necromancy...
It turns out there are Minimig implementations with Akiko. I wonder if they are more viable. |
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#285 |
Registered User
Join Date: Oct 2020
Location: Bicester
Posts: 2,087
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In what way?
for testing? I know it is a hardware implementation, but, would it be accurate timing wise to a real cd32 or is it just enough to get the software/games that use it to work? it might give odd results if you were to run your akiko test program on it (like winuae does), but, you never know. |
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#286 | |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,938
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Quote:
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#287 |
Registered User
Join Date: Oct 2020
Location: Bicester
Posts: 2,087
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can't believe that no one with a tf330 gave your akiko test tool a try and reported the results.
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#288 |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,938
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I lost interest and started looking at the sound side. I think I have pretty decent 16 channel mixer for 040+, but I still need to complete the output side and put some proper thought into latency/synchronisation. I thought I'd have a break from that for a short time and go back to doing some modding, since that's what it was all for
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#289 |
Registered User
Join Date: Jan 2005
Location: UmeƄ
Age: 44
Posts: 962
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#290 |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,938
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#291 |
Registered User
Join Date: Jan 2019
Location: Germany
Posts: 3,498
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Actually, you could just load the 68030.library to avoid any CACR poking....
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#292 | |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,938
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Quote:
![]() It was just an experiment in this case. We don't have any firm data to suggest Akiko is any use on 68030 other than the Beast (70Mhz) because so far nobody has tested it. I was made aware however that there are Minimig systems that have it and they might be less hampered by chip ram access which seems to be the limiting factor rather than Akiko itself. |
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#293 | |
Registered User
Join Date: Jan 2019
Location: Germany
Posts: 3,498
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Quote:
Akiko was a 5-minute design without too much thought, but also without too much cost. What do you expect from this last-minute hack? The Os support is even less useful - it first goes through Akiko (potentially even accessing out-of-range memory) and then through a second pass with the blitter. Thus, two-pass through two slow devices, a really winning combo. |
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#294 | |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,938
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Quote:
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Thread | Thread Starter | Forum | Replies | Last Post |
C2P Performance issues | meeku | Coders. Asm / Hardware | 10 | 09 April 2019 18:29 |
Alien Breed 3D CD32 - Akiko C2P? | wairnair | support.Games | 9 | 06 July 2018 14:32 |
Gloom Akiko C2P? | Whitesnake | support.Games | 5 | 23 April 2007 19:01 |
Blizzard 030/50 Accelerators | Parsec | Amiga scene | 20 | 14 February 2004 17:48 |
Cd32 Emulator (AKIKO) | Doozy | support.WinUAE | 3 | 06 December 2001 08:41 |
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