util: add generic ringbuffer utitilty

1 files changed, 29 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/util/u_ringbuffer.h b/src/gallium/auxiliary/util/u_ringbuffer.h
new file mode 100644
index 0000000000..85f0ad6c1f
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_ringbuffer.h
@@ -0,0 +1,29 @@
+
+#ifndef UTIL_RINGBUFFER_H
+#define UTIL_RINGBUFFER_H
+
+#include "pipe/p_compiler.h"
+#include "pipe/p_defines.h"       /* only for pipe_error! */
+
+/* Generic header
+ */
+struct util_packet {
+   unsigned dwords:8;
+   unsigned data24:24;
+};
+
+struct util_ringbuffer;
+
+struct util_ringbuffer *util_ringbuffer_create( unsigned dwords );
+
+void util_ringbuffer_destroy( struct util_ringbuffer *ring );
+
+void util_ringbuffer_enqueue( struct util_ringbuffer *ring,
+                              const struct util_packet *packet );
+
+enum pipe_error util_ringbuffer_dequeue( struct util_ringbuffer *ring,
+                                         struct util_packet *packet,
+                                         unsigned max_dwords,
+                                         boolean wait );
+
+#endif