mesa: Enable true refcounting for NullBufferObj.

This object can be shared with another context, so we cannot just
delete it when the owning context is being destroyed.

Ensuring that buffer objects are properly refcounted guarantees
NullBufferObj is destroyed when all references to it are removed.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index 2271550efe1..dabb1386ca4 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -556,6 +556,17 @@ _mesa_init_buffer_objects( GLcontext *ctx )
 }
 
 
+void
+_mesa_free_buffer_objects( GLcontext *ctx )
+{
+   _mesa_reference_buffer_object(ctx, &ctx->Array.ArrayBufferObj, NULL);
+   _mesa_reference_buffer_object(ctx, &ctx->Array.ElementArrayBufferObj, NULL);
+
+   _mesa_reference_buffer_object(ctx, &ctx->CopyReadBuffer, NULL);
+   _mesa_reference_buffer_object(ctx, &ctx->CopyWriteBuffer, NULL);
+}
+
+
 /**
  * Bind the specified target to buffer for the specified context.
  * Called by glBindBuffer() and other functions.