workspace/kwin/nvidiahack.cpp

   1 /********************************************************************
   2  KWin - the KDE window manager
   3  This file is part of the KDE project.
   4
   5 Copyright (C) 2007 Lubos Lunak <l.lunak@kde.org>
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 *********************************************************************/
  20
  21 /*
  22
  23  The only purpose of this file is to be later in the link order than
  24  (nvidia's) libGL, thus being initialized by the dynamic linker before it,
  25  allowing it to set __GL_YIELD=NOTHING soon enough for libGL to notice it.
  26
  27 */
  28
  29 #include <stdlib.h>
  30 #include <kdefakes.h>
  31
  32 class kwinnvidiahack
  33     {
  34     public:
  35         kwinnvidiahack();
  36     };
  37
  38 kwinnvidiahack::kwinnvidiahack()
  39     {
  40     const char* env = getenv( "KWIN_NVIDIA_HACK" );
  41 #if 1 // turned on by default
  42     if( env == NULL || env[ 0 ] != '0' )
  43         setenv( "__GL_YIELD", "NOTHING", true );
  44 #else // turned off by default
  45     if( env != NULL && env[ 0 ] != '0' )
  46         setenv( "__GL_YIELD", "NOTHING", true );
  47 #endif
  48     }
  49
  50 kwinnvidiahack kwinnvidiahackinst;