From 1be2c4ed3201fa3f9674fda30c2c1dada30a66c0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lubo=C5=A1=20Lu=C5=88=C3=A1k?= <l.lunak@kde.org>
Date: Tue, 14 Nov 2006 11:52:20 +0000
Subject: [PATCH] Detect and check GLX version/extensions.

svn path=/branches/work/kwin_composite/; revision=604805
---
 glutils.cpp      | 12 +++++++-----
 glutils.h        |  1 +
 scene_opengl.cpp |  3 +++
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/glutils.cpp b/glutils.cpp
index 9c8af48704..8e5375099f 100644
--- a/glutils.cpp
+++ b/glutils.cpp
@@ -17,11 +17,11 @@ namespace KWinInternal
 {
 // Variables
 // GL version, use MAKE_OPENGL_VERSION() macro for comparing with a specific version
-int glVersion;
+static int glVersion;
 // GLX version, use MAKE_GLX_VERSION() macro for comparing with a specific version
-int glXVersion;
-// List of all supported GL extensions
-QStringList glExtensions;
+static int glXVersion;
+// List of all supported GL and GLX extensions
+static QStringList glExtensions;
 int glTextureUnitsCount;
 
 // Function pointers
@@ -58,6 +58,9 @@ void initGLX()
     int major, minor;
     glXQueryVersion( display(), &major, &minor );
     glXVersion = MAKE_GLX_VERSION( major, minor, 0 );
+    // Get list of supported GLX extensions. Simply add it to the list of OpenGL extensions.
+    glExtensions += QString((const char*)glXQueryExtensionsString(
+        display(), DefaultScreen( display()))).split(" ");
     }
 
 void initGL()
@@ -94,5 +97,4 @@ bool hasGLExtension(const QString& extension)
     return glExtensions.contains(extension);
     }
 
-
 } // namespace
diff --git a/glutils.h b/glutils.h
index be6b03f32d..93886aea22 100644
--- a/glutils.h
+++ b/glutils.h
@@ -44,6 +44,7 @@ extern int glTextureUnitsCount;
 
 bool hasGLVersion(int major, int minor, int release = 0);
 bool hasGLXVersion(int major, int minor, int release = 0);
+// use for both OpenGL and GLX extensions
 bool hasGLExtension(const QString& extension);
 
 
diff --git a/scene_opengl.cpp b/scene_opengl.cpp
index f15481afcc..2033e244f1 100644
--- a/scene_opengl.cpp
+++ b/scene_opengl.cpp
@@ -149,6 +149,9 @@ SceneOpenGL::SceneOpenGL( Workspace* ws )
     if( !glXQueryExtension( display(), &dummy, &dummy ))
         return;
     initGLX();
+    // check for FBConfig support
+    if( !hasGLXVersion( 1, 3 ) && !hasGLExtension( "GLX_SGIX_fbconfig" ))
+        return;
     tfp_mode = ( glXBindTexImageEXT != NULL && glXReleaseTexImageEXT != NULL );
     // use copy buffer hack from glcompmgr (called COPY_BUFFER there) - nvidia drivers older than
     // 1.0-9xxx don't update pixmaps properly, so do a copy first