Added warning if GLX version is less than 1.3.

app/gfx/gl/gl_context_linux.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file implements the ViewGLContext and PbufferGLContext classes.
 
 #include <dlfcn.h>
 #include <GL/glew.h>
 #include <GL/glxew.h>
 #include <GL/glx.h>
 #include <GL/osmew.h>
+#include <unistd.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 
 #include "app/x11_util.h"
 #include "base/logging.h"
+#include "base/process_util.h"
 #include "base/scoped_ptr.h"
 #include "app/gfx/gl/gl_context.h"
 #include "app/gfx/gl/gl_context_osmesa.h"
 
 namespace gfx {
 
 typedef GLXContext GLContextHandle;
 typedef GLXPbuffer PbufferHandle;
 
 // This class is a wrapper around a GL context that renders directly to a
@@ skipping 115 matching lines @@
     }
     // glxewContextInit really only needs a display connection to
     // complete, and we don't want to have to create an OpenGL context
     // just to get access to GLX 1.3 entry points to create pbuffers.
     // We therefore added a glxewContextInitWithDisplay entry point.
     Display* display = x11_util::GetXDisplay();
     if (glxewContextInitWithDisplay(display) != GLEW_OK) {
       LOG(ERROR) << "glxewContextInit failed";
       return false;
     }
+
+    int major, minor;
+    if (!glXQueryVersion(display, &major, &minor)) {
+      LOG(ERROR) << "glxQueryVersion failed";
+      return false;
+    }
+
+    if (major == 1 && minor < 3) {
+      LOG(WARNING) << "GLX 1.3 or later is recommended.";
+    }
   }
 
   initialized = true;
   return true;
 }
 
 bool ViewGLContext::Initialize(bool multisampled) {
   if (multisampled) {
     LOG(WARNING) << "Multisampling not implemented.";
   }
@@ skipping 387 matching lines @@
 
     scoped_ptr<PixmapGLContext> context_pixmap(new PixmapGLContext);
     if (context_pixmap->Initialize(shared_handle))
       return context_pixmap.release();
 
     return NULL;
   }
 }
 
 }  // namespace gfx