D23120: Use compiler __SSE2__ definitions and C++11 alignas

[Vlad Zagorodniy]

zzag added a comment.


  > There seem to be frequent crashes in the quad version of this code, but
  >  this change should not make any difference from what I can tell.
  
  I doubt that kwin crashes because of alignment issues. I suggest looking into whether GLVertexBuffer::streamingBuffer() is still valid.

INLINE COMMENTS

> kwineffects.cpp:1137
>      case GL_QUADS:
> -#ifdef HAVE_SSE2
> +#if defined(__SSE2__)
>          if (!(intptr_t(vertex) & 0xf)) {

Stick only with either ifdef or if defined. Mixing both can be confusing for some people.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D23120

To: gladhorn, #kwin
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