[Webkit-unassigned] [Bug 197971] GLContextEGL should check the supported EGL version at compile time

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197971

Adrian Perez <aperez at igalia.com> changed:

           What    |Removed                     |Added
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                 CC|                            |aperez at igalia.com

--- Comment #10 from Adrian Perez <aperez at igalia.com> ---
Comment on attachment 370161
  --> https://bugs.webkit.org/attachment.cgi?id=370161
Fix to check the EGL version at compile time

I don't understand why it is needed to have guards for EGL
version 1.5: The call to “.eglCheckVersion()” can be done
regardless of the version, and if at runtime the check fails
then we are already falling back to check for 1.4 anyway. I
am failing to see how this can be useful and/or needed.

I can make a case for having *only* checks at runtime being
better. Imagine the case in which a distributor packages
WebKit using for building headers from a version of Mesa
which does NOT define EGL_VERSION_1_5; then Mesa is updated
to a new release that happens to support EGL version 1.5 and
new packages available. With a build-time check, the WebKit
package would need to be rebuilt to take advantage of new
features, with a runtime check things will just start working
automatically.

(Not to mention that usual “modus operandi” of OpenGL, EGL,
and related APIs is to provide a common base guaranteed to
work, and have applications check at run time by querying
extensions, versions, and so on.)

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