It is supported by my browser. So basically I can just call glDrawBuffers
and it should just work? Thank you.
On Sunday, August 24, 2014 1:46:17 PM UTC-4, jj wrote:
>
> In Emscripten glDrawBuffers is just glDrawBuffers. To query if that
> extension is supported, look for the string "WEBGL_draw_buffers" in
> glGetString(GL_EXTENSIONS);, e.g.
>
> if (strstr(glGetString(GL_EXTENSIONS), "WEBGL_draw_buffers"))
> {
> printf("WEBGL_draw_buffers is supported!\n");
> glDrawBuffers(...); // Now safe to call WEBGL_draw_buffers since we
> know it is supported.
> }
>
>
>
> 2014-08-24 20:34 GMT+03:00 Robert Goulet <[email protected]
> <javascript:>>:
>
>> Yes perhaps you are right. If I use glDrawBuffers directly, it seems to
>> work (no GL error reported), however glDrawBuffers is not supported by
>> WebGL 1.0 specs. To use it, one must query for the extension
>> WEBGL_draw_buffers.
>>
>> So then I am wondering, what does Emscripten glDrawBuffers map to?
>>
>> On Sunday, August 24, 2014 1:22:14 PM UTC-4, jj wrote:
>>
>>> Oh wait, actually that sounds odd like Alon mentions: Are you calling
>>> getProcAddress with the name of an extension? That's unexpected, it's only
>>> supposed to be used for function names that an extension supports. Does
>>> glfwGetProcAddress("glDrawBuffers") work?
>>>
>>>
>>> 2014-08-24 20:07 GMT+03:00 Alon Zakai <[email protected]>:
>>>
>>>> Hmm, looks like we don't support any extensions in our getProcAddress
>>>> code. It just supports functions. Should it support extensions? I'm not
>>>> sure which docs to read regarding that.
>>>>
>>>> - Alon
>>>>
>>>>
>>>>
>>>> On Sun, Aug 24, 2014 at 9:46 AM, Jukka Jylänki <[email protected]>
>>>> wrote:
>>>>
>>>>> In Emscripten you have all the GL functions for core spec and
>>>>> extensions available already statically at compile-time without having to
>>>>> obtain function pointers. Calling the functions without obtaining
>>>>> pointers
>>>>> is preferred, since it gives better performance and is generally also
>>>>> simpler.
>>>>>
>>>>> If you still want to call the function by querying the pointers e.g.
>>>>> in order to have a symmetric code path for both native and Emscripten,
>>>>> you
>>>>> should be able to. Perhaps we are missing support for that
>>>>> function/extension in glfwGetProcAddress? Try checking the
>>>>> src/library_gl.js and src/library_glfw.js on how they go through the
>>>>> route
>>>>> to obtain the function pointers to see what might be off there.
>>>>>
>>>>>
>>>>> 2014-08-24 19:39 GMT+03:00 Robert Goulet <[email protected]>:
>>>>>
>>>>> Hello,
>>>>>>
>>>>>> I am trying to get a WebGL extension, namely WEBGL_draw_buffers,
>>>>>> using glfwGetProcAddress and it always return nullptr. When I list
>>>>>> all the available extensions of my browser I clearly see that
>>>>>> WEBGL_draw_buffers is listed, and I am even able to run a demo on a
>>>>>> web page that make use of it. So why glfwGetProcAddress always
>>>>>> returns nullptr when used with Emscripten? Is this supposed to work?
>>>>>>
>>>>>> Chrome JS console output this error:
>>>>>> bad name in getProcAddress: WEBGL_draw_buffers | WEBGL_draw_buffers
>>>>>>
>>>>>> Also I am not sure if this is needed, but I made sure WebGL draft
>>>>>> extensions are enabled in Chrome.
>>>>>>
>>>>>> Or maybe glDrawBuffers is already mapped to WEBGL_draw_buffers when
>>>>>> used in Emscripten? Can anyone confirm/deny this?
>>>>>>
>>>>>> Thank you!
>>>>>>
>>>>>> --
>>>>>> 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].
>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>
>>>>>
>>>>> --
>>>>> 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].
>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>
>>>>
>>>> --
>>>> 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].
>>>> For more options, visit https://groups.google.com/d/optout.
>>>>
>>>
>>> --
>> 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] <javascript:>.
>> For more options, visit https://groups.google.com/d/optout.
>>
>
>
--
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].
For more options, visit https://groups.google.com/d/optout.
