wined3d: Set the currently active context to NULL when it's destroyed.

[Henri Verbeet]

This should make us crash when trying to use the "currently active" context
after it has been destroyed, rather than messing around with freed memory.
---
 dlls/wined3d/context.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/dlls/wined3d/context.c b/dlls/wined3d/context.c
index 4ae7c3d..c7db25a 100644
--- a/dlls/wined3d/context.c
+++ b/dlls/wined3d/context.c
@@ -1010,6 +1010,12 @@ void DestroyContext(IWineD3DDeviceImpl *This, WineD3DContext *context) {
 
     LEAVE_GL();
 
+    if (This->activeContext == context)
+    {
+        This->activeContext = NULL;
+        TRACE("Destroying the active context.\n");
+    }
+
     /* Cleanup the GL context */
     pwglMakeCurrent(NULL, NULL);
     if(context->isPBuffer) {
-- 
1.6.0.6



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