I don't actually know which things unity would use to hold the value of externref, just guessing it would be IntPtr. But by anything it require that emscripten can officially define externref first anyway
On Friday, 24 March 2023 at 00:03:02 UTC+7 s...@google.com wrote: > On Thu, Mar 23, 2023 at 9:51 AM Thaina Yu <thai...@gmail.com> wrote: > >> I am actually using emscripten from unity and I mainly use C# code from >> unity side. But there are tons of 3rd party library and SDK that written >> with assumption that we will only use JavaScript. It then need us to >> construct javascript object in javascript and pass javascript object >> reference all over the places. For example, the google's firebase SDK that >> we need to construct it special object type to work with its complex >> services >> >> It then become very frustrating to wrap everything in an API with >> mergeInto library that kept growing for everythings related to js object >> >> With just the ability to pass externref into C# as IntPtr or int64 and so >> C# can pass it to another js API after it was done everything in C# is just >> what we really need, everything would come together as a flow of reference. >> The chain of bottleneck is that unity rely on emscripten to fully support >> externref >> first then it could start support it in some future. So the sluggish are >> stacking up >> > > But `IntPtr` and `int64` are fundamentally not externref, right? Or are > you imagining those being indexes into a table of externref perhaps? That > would work, but then the tricky part becoming managing that table. This is > mind what embind does when it refers to JS object from native code I > believe. > > >> On Thursday, 23 March 2023 at 23:34:43 UTC+7 s...@google.com wrote: >> >>> On Thu, Mar 23, 2023 at 9:20 AM Thaina Yu <thai...@gmail.com> wrote: >>> >>>> Thank you very much. Are there any public discussion or roadmap to >>>> add EM_ASM_REF into emscripten? >>>> >>> >>> You are the first person that I know of to suggest it. >>> >>> Be aware that using externref directly in C/C++ is very limited, even >>> after the recent changes. For example you can't store them in structs or >>> class or store them to memory. All you can really do with them is pass >>> them around and (maybe) put them in tables. So in practice I'm not sure >>> how useful this stuff is yet, but I could be wrong? >>> >>> >>> >>> >>>> >>>> On Thursday, 23 March 2023 at 23:17:52 UTC+7 s...@google.com wrote: >>>> >>>>> On Thu, Mar 23, 2023 at 6:52 AM Thaina Yu <thai...@gmail.com> wrote: >>>>> >>>>>> Do we have anyway to write hand-written assembly code along with >>>>>> emscripten? And is it possible to return that externref from wasm code >>>>>> into >>>>>> emscripten world? >>>>> >>>>> >>>>> Here is the example how to use externref in assembly: >>>>> https://github.com/emscripten-core/emscripten/blob/main/test/core/test_externref.s >>>>> >>>>> Until recently there was no way to communicate those references >>>>> directly to C++ but it maybe possible now that upstream clan support has >>>>> landed. >>>>> >>>>> There is no current support for externref in EM_ASM. We could >>>>> potentially add EM_ASM_REF which returns a ref to C/C++ but until >>>>> recently >>>>> that would have been impossible. >>>>> >>>>> >>>>>> I am actually using unity which use emscripten to build webgl. Would >>>>>> it possible to use EM_ASM_PTR to write wasm code to return as pointer >>>>>> (externref ? (an so I might return pointer as IntPtr in C#)) ? >>>>>> >>>>>> On Friday, 17 March 2023 at 22:35:55 UTC+7 tli...@google.com wrote: >>>>>> >>>>>>> Yes, but note that the usage in that commit is only in hand-written >>>>>>> assembly code, not in C/C++. >>>>>>> >>>>>>> More recently, support for externref landed upstream in clang: >>>>>>> https://github.com/llvm/llvm-project/blob/main/clang/test/CodeGen/WebAssembly/wasm-externref.c. >>>>>>> >>>>>>> AFAIK we haven't yet experimented with it in Emscripten, but in >>>>>>> principle >>>>>>> it should work. >>>>>>> >>>>>>> On Fri, Mar 17, 2023 at 10:23 AM Thaina Yu <thai...@gmail.com> >>>>>>> wrote: >>>>>>> >>>>>>>> Is this mean externref already usable? >>>>>>>> >>>>>>>> https://github.com/emscripten-core/emscripten/pull/15913 >>>>>>>> >>>>>>>> On Monday, 10 October 2022 at 22:56:34 UTC+7 karl.we...@gmail.com >>>>>>>> wrote: >>>>>>>> >>>>>>>>> Does anyone have news on this topic? >>>>>>>>> >>>>>>>>> tli...@google.com schrieb am Montag, 25. Januar 2021 um 19:51:36 >>>>>>>>> UTC+1: >>>>>>>>> >>>>>>>>>> I don't think so, but you can keep an eye on commits from "wingo" >>>>>>>>>> and "pmatos" on reviews.llvm.org to keep track of the progress. >>>>>>>>>> >>>>>>>>>> On Mon, Jan 25, 2021 at 12:55 AM ben layet <lay...@gmail.com> >>>>>>>>>> wrote: >>>>>>>>>> >>>>>>>>>>> Thanks! >>>>>>>>>>> Is there a feature ticket in a publicly visible ticket tracker >>>>>>>>>>> that I can keep an eye on? >>>>>>>>>>> cheers >>>>>>>>>>> ben >>>>>>>>>>> >>>>>>>>>>> On Saturday, 23 January 2021 at 17:54:25 UTC tli...@google.com >>>>>>>>>>> wrote: >>>>>>>>>>> >>>>>>>>>>>> Not yet, but there are some folks working on this. Perhaps it >>>>>>>>>>>> will be ready to use in a few months? It’s hard to say for sure. >>>>>>>>>>>> >>>>>>>>>>>> On Sat, Jan 23, 2021 at 03:49 ben layet <lay...@gmail.com> >>>>>>>>>>>> wrote: >>>>>>>>>>>> >>>>>>>>>>>>> Does emscripten support externref reference types for holding >>>>>>>>>>>>> opaque handles to JS objects in C++? 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