NOTE: This is just a PoC (Proof of concept) repository! The work here is finished as we have "proven our concept" ;-). The "real" implementation is in this repository.
This repository contains different approaches to achieve running kotlin on the jvm inside godot:
| Branch | Description |
|---|---|
| cpp_poc | Original first very rudimentary PoC which uses cpp as bridge to start an embedded jvm using jni |
| ranie/rust-jni | PoC which uses rust instead of cpp as glue layer and uses jni to interact with the jvm. Discontinued because of development overhead with jni and godot inside rust |
| ranie/kn-jni | PoC which uses K/N instead of cpp as glue layer and uses jni to interact with jvm. Discontinued because of sever perf impact from crossing boundaries many times (godot(cpp) -> K/N -> JNI(cpp) -> JVM -> JNI(cpp) -> K/N -> godot(cpp) for a simple call to a function |
| ranie/cpp-jvm | Same approach as the original PoC but setup in a better way. Cpp is used as glue code to interact with the jvm using jni and to embedd a jvm. Also the final poc which is used for benchmarks against GDScript and our K/N binding. This approach will be used in godot-jvm but not as a GDNative binding as done in this poc, rather as a module like the C# bindings to furthere reduce layering and inproove perf and integration |
The most relevant branch (and the only one containing some instruction to test for yourself) is ranie/cpp-jvm. The godot-jvm project is based on the insigths gained in that branch.