From b51ef59c7c4b752f14eb491b4be7ef23d1ccce9f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fredrik=20H=C3=B6glund?= <fredrik@kde.org>
Date: Tue, 18 Jan 2011 22:36:58 +0000
Subject: [PATCH] Disable the lanczos filter with the Intel driver in Mesa
 7.10.

It's reported to cause kwin to hang when rendering thumbnails.

svn path=/branches/KDE/4.6/kdebase/workspace/; revision=1215502
---
 lanczosfilter.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lanczosfilter.cpp b/lanczosfilter.cpp
index 088fb1bb1b..9d52eea07c 100644
--- a/lanczosfilter.cpp
+++ b/lanczosfilter.cpp
@@ -24,6 +24,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #ifdef KWIN_HAVE_OPENGL_COMPOSITING
     #include <kwinglutils.h>
+    #include <kwinglplatform.h>
 #endif
 
 #include <kwineffects.h>
@@ -74,6 +75,11 @@ void LanczosFilter::init()
         return;
         }
 
+    // The lanczos filter is reported to be broken with the Intel driver and Mesa 7.10
+    GLPlatform *gl = GLPlatform::instance();
+    if ( gl->driver() == Driver_Intel && gl->mesaVersion() >= kVersionNumber(7, 10) )
+        return;
+
     m_shader = new LanczosShader( this );
     if( !m_shader->init() )
         {