19 June 2024, 11:53 | #281 | |
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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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19 June 2024, 13:14 | #282 | |
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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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19 June 2024, 17:50 | #283 | |
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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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04 July 2024, 22:46 | #284 |
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Wildcard necromancy...
It turns out there are Minimig implementations with Akiko. I wonder if they are more viable. |
05 July 2024, 00:32 | #285 |
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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. |
05 July 2024, 00:34 | #286 | |
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05 July 2024, 00:34 | #287 |
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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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05 July 2024, 00:38 | #288 |
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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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05 July 2024, 14:29 | #289 |
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05 July 2024, 14:58 | #290 |
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05 July 2024, 15:17 | #291 |
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Actually, you could just load the 68030.library to avoid any CACR poking....
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05 July 2024, 15:57 | #292 | |
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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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05 July 2024, 19:22 | #293 | |
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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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05 July 2024, 19:37 | #294 | |
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