Ok. Thanks for your help On Tue, 13 Sept 2022, 11:39 pm 'Sam Clegg' via emscripten-discuss, < [email protected]> wrote:
> > > On Fri, Sep 9, 2022 at 4:14 AM Andrew Lay <[email protected]> wrote: > >> Hi Sam, >> No luck with this approach either. Same problem. >> I outlined it in this forum. >> https://github.com/emscripten-core/emscripten/issues/17816 >> >> Let me know if you have any ideas. >> >> Also can you let me know if there is a better place to get technical >> assistance? >> >> Am frustrating people in the way I write my questions, causing people to >> skip over them? >> >> > No, this forum, and github issues are the recommended support channels and > your question seem reasonable to me :) > You could also try to discord server. > > I myself have very little knowledge of how the offscreen canvas stuff > works so I don't have any easy answers for you I'm afraid. One thing I > would recommend is looking through `test/test_browser.py` for > examples/tests that use the offscreen canvas setting. Do they work as > expected for you? > > cheers, > sam > > > >> Thanks, >> Andrew Lay >> >> On Wednesday, September 7, 2022 at 1:07:33 PM UTC+10 Andrew Lay wrote: >> >>> Hi Sam, >>> Thanks for replying. When I have time I will try the Emscripten way. >>> I will let you know how I go. >>> >>> On Tue, 6 Sept 2022, 4:57 am 'Sam Clegg' via emscripten-discuss, < >>> [email protected]> wrote: >>> >>>> >>>> >>>> On Fri, Sep 2, 2022 at 5:46 AM Andrew Lay <[email protected]> wrote: >>>> >>>>> Hi Sam, >>>>> Thank you for your quick response. >>>>> >>>>> I have seen the struct params that you speak of, but all of the >>>>> examples that I have seen relate to GLES2 C api. For example I looked at >>>>> 'webgl_draw_triangle.c' example file in the Emscripten folder. >>>>> >>>>> When I saw the complexity of the library, I thought it seemed like >>>>> overkill for what I wanted to do, simply draw a buffer of rgba values to a >>>>> canvas. >>>>> >>>>> This is why I tried to call the ordinary JavaScript API from an >>>>> Emscripten PThread. See here: >>>>> https://github.com/alayGit/DummyEmscriptenCanvasForumExample/blob/main/Emscripten/EmscriptenCanvasWorker.cpp >>>>> >>>>> I am wasting my time trying to do things this way? >>>>> >>>> >>>> I would stick to using the emscripten opengl implementation, unless you >>>> really know what you are doing and want to get into the weeds. Otherwise, >>>> you likely end up running into issues that emscripten has already solved in >>>> its implementation. I imagine this is one of those cases but I'm not an >>>> expert on this part of the code. >>>> >>>> >>>> >>>>> Should I use the GLES2 library, or are the things you pointed me too >>>>> and the stuff in the draw triangle example needed for the JavaScript API >>>>> method too? >>>>> >>>>> On Fri, Sep 2, 2022 at 10:01 PM 'Sam Clegg' via emscripten-discuss < >>>>> [email protected]> wrote: >>>>> >>>>>> Seems likely related to `explicitSwapControl`, >>>>>> `renderViaOffscreenBackBuffer` and `proxyContextToMainThread` which are >>>>>> part of `EmscriptenWebGLContextAttributes`: >>>>>> >>>>>> https://emscripten.org/docs/api_reference/html5.h.html?highlight=gamepad#c.EmscriptenWebGLContextAttributes.explicitSwapControl >>>>>> >>>>>> Have you read the documentation related to those? >>>>>> >>>>>> >>>>>> >>>>>> On Fri, Sep 2, 2022 at 4:14 AM Andrew Lay <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> Can someone please help with out? >>>>>>> >>>>>>> I am having trouble correctly drawing to Canvas on Pthreads. >>>>>>> >>>>>>> There is nothing being drawn to the canvas on the screen while the >>>>>>> application is running, however if I freeze the code with the Dev tools >>>>>>> in >>>>>>> the debugger the Canvas updates. >>>>>>> >>>>>>> I have created an example in this git hub repo: >>>>>>> >>>>>>> https://github.com/alayGit/DummyEmscriptenCanvasForumExample >>>>>>> >>>>>>> It is not pretty but I hope it will demonstrate the issue. >>>>>>> >>>>>>> If anything is not clear please let me know. >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "emscripten-discuss" group. >>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>> send an email to [email protected]. >>>>>>> To view this discussion on the web visit >>>>>>> https://groups.google.com/d/msgid/emscripten-discuss/94127203-44fc-45f5-9fcc-402a231b49e9n%40googlegroups.com >>>>>>> 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