Matteo Bruni : winex11.drv: Don' t call glXSwapBuffers if the context or the drawable are invalid.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 90608c8ce633cd79dffd45d02b32fe16e615f4fa
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=90608c8ce633cd79dffd45d02b32fe16e615f4fa

Author: Matteo Bruni <mbruni at codeweavers.com>
Date:   Thu Mar 17 22:51:04 2011 +0100

winex11.drv: Don't call glXSwapBuffers if the context or the drawable are invalid.

---

 dlls/winex11.drv/opengl.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/dlls/winex11.drv/opengl.c b/dlls/winex11.drv/opengl.c
index 81979ae..a7ec8c8 100644
--- a/dlls/winex11.drv/opengl.c
+++ b/dlls/winex11.drv/opengl.c
@@ -3818,6 +3818,20 @@ BOOL CDECL X11DRV_SwapBuffers(X11DRV_PDEVICE *physDev)
 
   TRACE("(%p)\n", physDev);
 
+  if (!ctx)
+  {
+      WARN("Using a NULL context, skipping\n");
+      SetLastError(ERROR_INVALID_HANDLE);
+      return FALSE;
+  }
+
+  if (!physDev->current_pf)
+  {
+      WARN("Using an invalid drawable, skipping\n");
+      SetLastError(ERROR_INVALID_HANDLE);
+      return FALSE;
+  }
+
   drawable = get_glxdrawable(physDev);
 
   wine_tsx11_lock();