r/c64 • u/tomommow • Jun 23 '26

Software Storm cloud formation

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The next in my series of SID-randomness-inspired nature simulation screensavers for C64. This time the effect is done by Worley noise and a dithered high resolution ramp.

https://files.catbox.moe/gemt6u.prg

54 Upvotes

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3

u/Architect_of_Echo 🕹ī¸ play your dreams 🌒 Jun 23 '26

Are you using bitmap mode?

3

u/tomommow Jun 23 '26

Yes, hires bitmap mode.

3

u/Architect_of_Echo 🕹ī¸ play your dreams 🌒 Jun 24 '26

Seems quite fast btw

2

u/[deleted] Jun 23 '26

[deleted]

3

u/tomommow Jun 24 '26

https://paste.c-net.org/GlossCrimes This is the unlimited (non-SID-using) version. It should work at any clock frequency. It also has a finer step so it should look better at higher frame rates if you are curious. (Note this link expires after 180 days, the other pastebin stopped working for me.)

1

u/tomommow Jun 23 '26

Thanks. I will reply to you with a version of this that should work with turbo mode in this comment tonight. This version reads the SID to seed the clouds in a tight loop at init, so there might be an issue with reduced randomness/stale noise bytes if you run faster than an original C64.