1 files changed, 16 insertions, 0 deletions
diff --git a/indra/llwindow/llwindowsdl.cpp b/indra/llwindow/llwindowsdl.cpp
index 98484419f9..531c70e8d9 100644
--- a/indra/llwindow/llwindowsdl.cpp
+++ b/indra/llwindow/llwindowsdl.cpp
@@ -40,6 +40,10 @@
 #include "lldir.h"
 #include "llfindlocale.h"
 
+#include "../newview/llviewercontrol.h"
+
+extern LLControlGroup gSavedSettings;
+
 #if LL_GTK
 extern "C" {
 # include "gtk/gtk.h"
@@ -1098,6 +1102,18 @@ void LLWindowSDL::swapBuffers()
     if (mWindow)
     {
         SDL_GL_SwapWindow(mWindow);
+        U32 mode = gSavedSettings.getU32("MPVBufferOptiMode");
+        if (mode == 0)
+        {
+            if(gGLManager.mIsApple) mode = 2;
+            else mode = 1;
+        }
+        if (mode > 2)
+        {
+            glClientWaitSync(swapFense, GL_SYNC_FLUSH_COMMANDS_BIT, GL_TIMEOUT_IGNORED);
+            glDeleteSync(swapFense);
+            swapFense = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
+        }
     }
 }