[Mesa-dev] The forward-compatible bit question

[Chad Versace]

If the user creates a context with EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR set,
must Mesa return a context of *exactly* that version. For example, if the user requests
a 3.0 context with the forward-compatible bit set, is Mesa required to return a 3.0
context but not allowed to return a 3.1 context?

Here's the pertinent portion of the EGL_KHR_create_context spec. Perhaps I'm interpreting
the keywords "specific" and "exactly" too strictly. How do you interpret this?

         Because the purpose of forward-compatible contexts is to allow 

         application development on a specific OpenGL version with the
         knowledge that the app will run on a future version, context
         creation will fail if
         EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR is set and the
         context version returned cannot implement exactly the requested
         version.

Do we know what the other vendors do (Intel Windows, Nvidia, AMD)?