gpu: gpu-dawn crashes JVM on Windows 11 about mach HOT 3 CLOSED

By default Dawn bounces all C API calls through a vtable which acts as a swappable interface implementation for e.g. testing.

To initialize the interface, there must be a call to dawnProcSetProcs setting it to the return value of dawn::native::GetProcs(). Otherwise, you can directly call the result of function pointers dawn::native::GetProcs() returns and skip the vtable entirely - which is what Mach does: https://sourcegraph.com/search?q=context:global+repo:%5Egithub%5C.com/hexops/mach%24+machDawnGetProcTable&patternType=keyword&sm=0

There is some more info on it here: https://machengine.org/pkg/mach-gpu-dawn/#important-building-webgpu-api-symbols

However, I must warn you that the Mach project is moving away from Dawn/WebGPU in favor of our own graphics abstraction sysgpu. As a result, the mach-gpu-dawn project is likely to be removed soon.

My advice would be one of two options:

1. You could work with me on how to make e.g. Mach core more generally accessible to Java applications through JNI, this probably requires some planning and will take more effort, but would be a better solution long term depending on your use cases.
2. You can find a different way to get webgpu through Java

Hope that helps!

from mach.

First of all, thank you for your help!

I just tried calling directly and it didn't crashed the JVM though the status of the response is not success while in an executable file it works. Anyway, I am considering switching to using sysgpu, which I guess that it will be much more easier to debug. My only concern is if sysgpu can achieve a relatively stable state in the coming months, at least in the parts related to compute shaders? (According to the commit records, there has been no progress for four months.) If so, I'm willing to make at least sysgpu accessible to Java&Kotlin applications, since JVM and Android community is in short of a gpu interface that is modern and easy to deploy for a long time.

Thank you for taking the time out of your busy schedule to answer my question.

from mach.

sysgpu is definitely not stable, it is extremely experimental and likely to change a lot in the coming months. I expect its API and shading language to change dramatically.

from mach.