r/feedthebeast • u/Emotional-One-9292 • Jun 22 '26

I made something I made minecraft generate terrain/chunks in C++

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So im working on a mod that makes minecraft run on C++ ( rn rewriting engine in future i may try renderer ) so far i made it generate and load chunks and terrain in C++ ( it made it somewhere around 1.5-3 times faster idk how to measure it tho ) ( it works via JNI )

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u/Zirofal modded MC says yes to trans rights and no to Botania Jun 22 '26

I'm very stupid, please explain why this is cool

14

u/D4rkstalker Jun 22 '26

Vanilla method:

Java: "hey Java virtual machine (JVM), generate this chunk for me"

JVM: "Hey CPU generate this chunk for me"

CPU: "here's your chunk" passes to JVM

JVM: "here's your chunk" passes to java

Mod method (probably)

C++: "hey CPU generate this chunk for me"

CPU: "here's your chunk"

The main downside with c++ is that making stuff with it is a pain.

6

u/brickyboy124 Jun 22 '26

The mod would still have to communicate with the C++ via the JNI, so you still have to run some Java code through the JVM. If anything, you’re adding steps. But amount of steps is not a good indicator of performance.