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-rw-r--r--src/mesa/main/dd.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h
index 63fc62103a7..f300ad6cc00 100644
--- a/src/mesa/main/dd.h
+++ b/src/mesa/main/dd.h
@@ -1025,6 +1025,24 @@ struct dd_function_table {
*/
void (*QueryMemoryInfo)(struct gl_context *ctx,
struct gl_memory_info *info);
+
+ /**
+ * Indicate that this thread is being used by Mesa as a background drawing
+ * thread for the given GL context.
+ *
+ * If this function is called more than once from any given thread, each
+ * subsequent call overrides the context that was passed in the previous
+ * call. Mesa takes advantage of this to re-use a background thread to
+ * perform drawing on behalf of multiple contexts.
+ *
+ * Mesa may sometimes call this function from a non-background thread
+ * (i.e. a thread that has already been bound to a context using
+ * __DriverAPIRec::MakeCurrent()); when this happens, ctx will be equal to
+ * the context that is bound to this thread.
+ *
+ * Mesa will only call this function if GL multithreading is enabled.
+ */
+ void (*SetBackgroundContext)(struct gl_context *ctx);
};