D29684: Improve opengl debug messages

[Aleix Pol Gonzalez]

apol marked 3 inline comments as done.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D29684

To: apol, #kwin
Cc: zzag, kwin, Orage, cacarry, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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