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 >>>>>> <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. > 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/3d409ac6-1501-4523-a049-5bde033a2aefn%40googlegroups.com > <https://groups.google.com/d/msgid/emscripten-discuss/3d409ac6-1501-4523-a049-5bde033a2aefn%40googlegroups.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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