[Piglit] [PATCH 10/29] glapi: Read list of core extensions

[Chad Versace]

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On 05/25/2012 09:19 AM, Paul Berry wrote:
> On 21 May 2012 11:08, Pauli Nieminen <pauli.nieminen at linux.intel.com <mailto:pauli.nieminen at linux.intel.com>> wrote:
> 
>     There is extensions that have been pulled as is into core. Those
>     extensions only declare extension functions in gl.spec. To allow stub
>     loader know that required function is supported because of GL version we
>     need to add core version to the extension functions.
> 
> 
> Can you explain in more detail why this is necessary?  I thought that when an extension is pulled into core, the implementation was required to list that extension in its extension string.  So the stub loader should already know that these functions are supported.

The spec states that implementations are required to
continue advertising the extension string after it becomes
core. From the OpenGL 3.2 (Core Profile) spec, Section I.3.2:

  ARB extensions can be promoted to required core features in later revisions of
  OpenGL. When this occurs, the extension specifications are merged into the core
  specification. Functions and enumerants that are part of such promoted extensions
  will have the ARB affix removed.

  GL implementations of such later revisions should continue to export the name
  strings of promoted extensions in the EXTENSIONS strings and continue to support
  the ARB-affixed versions of functions and enumerants as a transition aid.

I don't know, though, how consistently drivers adhere to this requirement.

- ----
Chad Versace
chad.versace at linux.intel.com
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