SpritesMind.Net

As after some weekend party is a great moment for coding xD, i decide to check a bit the "volatile" pointers causing the issue. I tested adding a "volatile" keyword to every var accessing memory, and (at least in emulators Blastem and KMod, can't test in real hardware) i can make music samples sound...

I am using gcc 8.2 but i did my tests also with gcc 6.3 and 7.2, and with all of them i have the issue.
Probably one day i will try to make some performance test with different gccs, it can be interesting.

I had no idea about memory barriers. It is common not to find much info about 68k and gcc, and it is usually a problem. I hope Stef and the people like you who know about that stuff can improve SGDK and let us learn about that good behavior programing for the mega drive.

Ohh.. again a compiler optimization issue, generally optimization issue are caused by missing "volatile" keyword on port access. It also may be related to your "wait" loops. I observed for instance that in some situation the VDP_waitVSync() method may be optimized by the compiler so that the next l...

while(!Z80_isDriverReady()) while(Z80_isBusTaken()); You DO realize that Z80_isBusTaken() merely checks if the 68k has halted the Z80? That "while(Z80_isBusTaken());" either does nothing, or it hangs forever, depending on if the Z80 has been halted. Yes, that is the problem, the question is why tha...

A friend tested in his computer the last SGDK with the simple main sample playback and he got the same results, so i am happy to know it is not a problem of my computer or its configuration. In kega fusion the sample can be heard, but in blastem, exodus, regen and kmod, no sound is listened. Using k...

I was doing what you told me about porting the code to the SGDK version step by step. Now i am fully using SGDK but i can not get it to work. I got the 1.34 SGDK version, i added the global vars and path data, and then i created a folder with just a main.c file in src and i copied the samples and mu...

I can not replace the Vint function with SGDK one because it uses a lot of stuff for DMA, tiles, fades... that i do not use. My vint function is now reduced to 2 lines for those test: vtimer++; if (VIntProcess & PROCESS_XGM_TASK) XGM_doVBlankProcess(); Of course i have tested different implementatio...

Thanks for your answer Stef. Yep, it is very weird that all the accurate emulators play the music perfectly, the Kmod can not play samples in music and console freezes before the music starts. The last thing i tried is just loading the booting file (SGDK sega.s just with my vint function), then it j...

Hello mates. I am trying to add current XGM driver to my code, but i can't make it work properly. I copied the sound files keeping all the files unchanged, except some VDP functions replaced with the ones in my code. I updated my VINT function to look like the one in SGDK in terms of audio and dma, ...

I think the SRC stuff was temporarily commented out a while back due to a problem (and we were authoring all of our samples to the target rate on Tanglewood anyway) - might be worth commenting that back in. It was left in a bit of a mess after TW since there was a last minute rush to fix bugs and g...

Update: - Added support for the new Deflemask DMF 12 file format (ID 0x18) - Fixed PSG support - Added support for PCM sample conversion and export - Fixed the PCM "note on" offset (PCM samples should be included at the end of the Echo instrument pointer table). I've been using the Green Hill Zone ...

I also have some problems compiling the project. It can not find src_simple function. I found it in a file outside the project in the libsamplerate folder, but when i add this file i got hundreds of errors. When i comment the calling to that function i got buggy sounds in samples and some of the PSG...

It is not exactly the same, but you can keep the two planes using h/s, like in The lost World https://youtu.be/VPzKP8zubs0?t=1h53m36s. The only thing is i don't know how they do it

I think that trick is something like the "axelay effect" in some games like Jurassic park, Vectorman or Pier solar.
For Sonic 3D example, it is all about setting the vscroll offset at current + 1 in the even scanlines, so it will draw again the last odd scanline.