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? 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 >>>>> >>>>> <https://groups.google.com/d/msgid/emscripten-discuss/94127203-44fc-45f5-9fcc-402a231b49e9n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- >>>> You received this message because you are subscribed to a topic in the >>>> Google Groups "emscripten-discuss" group. >>>> To unsubscribe from this topic, visit >>>> https://groups.google.com/d/topic/emscripten-discuss/ie7N7EL1atk/unsubscribe >>>> . >>>> To unsubscribe from this group and all its topics, send an email to >>>> [email protected]. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/emscripten-discuss/CAL_va2_b7L7AtRNzOKiH9V4L4HbHc-TxBzf7Sq2c8iy0xzqL9Q%40mail.gmail.com >>>> >>>> <https://groups.google.com/d/msgid/emscripten-discuss/CAL_va2_b7L7AtRNzOKiH9V4L4HbHc-TxBzf7Sq2c8iy0xzqL9Q%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- >>> 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/CAC9WJu0NLw9uOFE_k_mzsqMYu8ixSCe3duww6EcqjS9CwhLCCg%40mail.gmail.com >>> >>> <https://groups.google.com/d/msgid/emscripten-discuss/CAC9WJu0NLw9uOFE_k_mzsqMYu8ixSCe3duww6EcqjS9CwhLCCg%40mail.gmail.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "emscripten-discuss" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/emscripten-discuss/ie7N7EL1atk/unsubscribe >> . >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/emscripten-discuss/CAL_va2_2MC9m7xxn_O-FnmaSzGK0BzVHgoe8V7y-OcnUzLTGUg%40mail.gmail.com >> >> <https://groups.google.com/d/msgid/emscripten-discuss/CAL_va2_2MC9m7xxn_O-FnmaSzGK0BzVHgoe8V7y-OcnUzLTGUg%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. 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