Re: Patch for OpenGL 3+ contexts via OSMesa

"Mike C. Fletcher" <[email protected]> Tue, 22 Jan 2019 22:54:46 -0500
Newsgroups gmane.comp.python.opengl.devel
Message-ID <[email protected]> 
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On 2019-01-19 6:42 p.m., Matthew Matl wrote:
> Hi Mike,
>
> Big fan of PyOpenGL! Just wanted to offer this simple patch for the 
> most recent version of master, which adds a handle for OSMesa's 
> OSMesaCreateContextAttribs 
> <https://github.com/anholt/mesa/blob/01e511233b24872b08bff862ff692dfb5b22c1f4/include/GL/osmesa.h#L167> function. 
> This function allows for users to create OSMesa contexts with core 
> profiles, which is hugely useful for supporting offscreen rendering 
> with modern (>=3.3) shaders.
>
> My only concern is that this function is new in Mesa 11.2, which was 
> released on April 4, 2016, so this might not work with older Mesa 
> versions. Not sure if the compilation system will handle this smoothly 
> or not. Suggestions are welcome, happy to help modify this as needed.


Hi Matthew,

Thanks for the patch. It's merged to master. I've also filled in couple 
of other missing functions from my local osmesa.h file. There's no 
compilation system, entry points are looked up at run-time, so there's 
no problem having entry points that aren't universally available. I 
don't actually have any osmesa test-code to run with, so at the moment I 
can't confirm that the changes work, but hopefully you can confirm after 
the next release.

Take care,
Mike


-- 
________________________________________________
   Mike C. Fletcher
   Designer, VR Plumber, Coder
   http://www.vrplumber.com
   http://blog.vrplumber.com


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    <div class="moz-cite-prefix">On 2019-01-19 6:42 p.m., Matthew Matl
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAOu37t0-2KiaUbCRytDDmGH_pdzYLxjByb_vv524P7oxHCZSRg@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">Hi Mike,
        <div><br>
        </div>
        <div>Big fan of PyOpenGL! Just wanted to offer this simple patch
          for the most recent version of master, which adds a handle for
          OSMesa's <a
href="https://github.com/anholt/mesa/blob/01e511233b24872b08bff862ff692dfb5b22c1f4/include/GL/osmesa.h#L167"
            target="_blank" moz-do-not-send="true">OSMesaCreateContextAttribs</a> function.
          This function allows for users to create OSMesa contexts with
          core profiles, which is hugely useful for supporting offscreen
          rendering with modern (&gt;=3.3) shaders.</div>
        <div><br>
        </div>
        <div>My only concern is that this function is new in Mesa 11.2,
          which was released on April 4, 2016, so this might not work
          with older Mesa versions. Not sure if the compilation system
          will handle this smoothly or not. Suggestions are welcome,
          happy to help modify this as needed.</div>
      </div>
    </blockquote>
    <p><br>
    </p>
    <p>Hi Matthew,</p>
    <p>Thanks for the patch. It's merged to master. I've also filled in
      couple of other missing functions from my local osmesa.h file.
      There's no compilation system, entry points are looked up at
      run-time, so there's no problem having entry points that aren't
      universally available. I don't actually have any osmesa test-code
      to run with, so at the moment I can't confirm that the changes
      work, but hopefully you can confirm after the next release.</p>
    <p>Take care,<br>
      Mike<br>
    </p>
    <br>
    <pre class="moz-signature" cols="72">-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  <a class="moz-txt-link-freetext" href="http://www.vrplumber.com">http://www.vrplumber.com</a>
  <a class="moz-txt-link-freetext" href="http://blog.vrplumber.com">http://blog.vrplumber.com</a>
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