HI, TapamN A lot of work has been done to reconfigure the KOS scheduler, and other things. I would love to see this benchmark done again ?. Do you have the benchmark src we can run to check, or can you try the latest PR's and check? What changes were made? The two most important changes would be fi...

well looks pretty bad here letting the compiler do it https://godbolt.org/z/qKGhKxqPf sh4 The output for the first one is pretty stupid, but the second and third are perfectly acceptable. You would probably inline a cross product anyways, so all those loads from the first two wouldn't be happening.

I'm impressed by the hardware you found. Here's another thing to add to your list: A speak-and-spell clone by Namco . I ordered that SG630. I have two systems I can dig out with PCI slots (a P3 and P4) that I can try it in at some point. Hopefully no battery damage on those, I've been meaning to che...

It looks like it's trying to use vqenc, but it hasn't been built yet. Go to the /opt/toolchains/dc/kos/utils/vqenc/ directory and build vqenc.

I have the basic CD driver working. You use can use stdio and fs_read to read stuff via DMA, with caching similar to KOS's existing CD cache, and it handles reads from multiple threads at the same time fine (trying that on KOS will hang those threads, though not the entire system). It probably doesn...

Could you open a bug report for that in the gcc bug tracker? [1] Make sure to set sh*-*-* as the target and CC me and Oleg. Also, please prefix the subject with [SH] . Ok, I'll try to do it sometime. It shouldn't be a big deal that I was using a patched version of 12.2? The patches are for integrat...

I'd be willing to help fund improvements. It would be nice if GCC would compile "char val = *char_ptr++;" as a single instruction, instead of four! [1] Related aside: I was recently looking into -mrelax and how/why it only partially works on GCC 12.2. Until a couple of years ago, would reg...

Apparently Tvspelsfreak's texconv was never even considered for being added to KOS due to the big-ass Qt dependency. I always thought it was a massive shame and that it feels wrong to have a Dreamcast SDK without such a tool built into it... is there any way you would consider letting us put this i...

If we were to twiddle the reduced buffer, it would work much faster. In that case, the tile matrix would have to be uniquely aligned (e.g. horizontally) and the KOS PVR would have to be hijacked, so it might not be suitable as a sample. Yes, I've done 60 FPS bloom on the DC , and twiddling the bloo...

Do you have example of doing this The clock counts the 50 MHz peripheral clock, divided by four (which would be 12.5 MHz), but it can be set to count on both the rising and falling edges of the clock, doubling it back up to 25 MHz. i have not been able to get this to work.. I haven't tried this, bu...

I think you have the right final result, but the calculation is off. The clock counts the 50 MHz peripheral clock, divided by four (which would be 12.5 MHz), but it can be set to count on both the rising and falling edges of the clock, doubling it back up to 25 MHz. One complaint I have about the ti...

For a cross product, I think it would be better to just let GCC decide how to preform it than using inline asm. That way GCC has more freedom to allocate and move registers around, rather than having to get things lined up for how the asm wants it. And, if you were writing asm yourself, I think it c...

I don't know your environment but guess try find /opt/local/include -name avconfig.h I'm using Xubuntu 20.04. All #includes using avconfig.h are local includes (#include "libavutil/avconfig.h"), so I don't think they should be using the system's headers. When I was first setting up the co...

I tried to build avconfig.h under libavutil seems to be missing. It does not seem to be affected by its . Odd, you're right. I'm surprised it compiles on my system. I wonder why? Is it somehow using my system's avconfig.h? New version with minor fixes: Add missing header (I don't think it's used by...

So, the reason BBA is so slow is because newlib breaks up every I/O operation into tiny chunks, and dcload-ip is kind of half baked and doesn't handle many small requests well. I feel incredibly stupid for not thinking about this earlier, but you can use setvbuf to disable stdio's buffering on a str...

Thanks again TapamN! I'll check this out when I have some time. Btw, do you have a github/gitlab/other? My game framework library auto-downloads its dependencies so it would be nice to add a download for this without the 7-zip requirement. I have SourceForge and GitHub accounts, that I've used for ...

After running across a post on using FFmpeg's ELBG for encoding Cinepak (which uses vector quantization), I thought I'd try seeing how well it would work for the Dreamcast. It worked quite well, so I ended up creating a full texture convertor (including uncompressed textures). Source code is attache...

That's much better, but from my benchmarks, the fastest way I've found to flush a large part of the cache is pctPurgeCache in the code in this attachment . I also tried flushing/purging the cache by accessing the memory mapped cache tags, but it still wasn't faster than pctPurgeCache. KOS's function...

Using the sprite command for tile maps works fine. I worked on an unfinished port of Micropolis (open source SimCity Classic), and I used the sprite command to render the city as a 120x100 tile tilemap without issues.

When using KOS's PVR driver, the driver will handle flipping automatically.

It looks like the cache isn't being flushed properly. dcache_flush_range((uintptr_t)textures[current_frame], (uintptr_t)(textures[current_frame] + stride * texture_height * 2)); // Send the video frame as a texture over to video RAM pvr_txr_load_dma(buf, textures[current_frame], stride * texture_hei...