gallium/util: Upload manager optimizations

Make sure that the upload manager doesn't upload data that's not
dirty. This speeds up the viewperf test proe-04/1 a factor 5 or so on svga.

Also introduce an u_upload_unmap() function that can be used
instead of u_upload_flush() so that we can pack
even more data in upload buffers. With this we can basically reuse the
upload buffer across flushes.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/src/gallium/auxiliary/util/u_upload_mgr.h b/src/gallium/auxiliary/util/u_upload_mgr.h
index c9a2ffe..9891513 100644
--- a/src/gallium/auxiliary/util/u_upload_mgr.h
+++ b/src/gallium/auxiliary/util/u_upload_mgr.h
@@ -56,15 +56,27 @@ struct u_upload_mgr *u_upload_create( struct pipe_context *pipe,
  */
 void u_upload_destroy( struct u_upload_mgr *upload );
 
-/* Unmap and release old buffer.
+/* Unmap and release old upload buffer.
  * 
+ * This is like u_upload_unmap() except the upload buffer is released for
+ * recycling. This should be called on real hardware flushes on systems
+ * that don't support the PIPE_TRANSFER_UNSYNCHRONIZED flag, as otherwise
+ * the next u_upload_buffer will cause a sync on the buffer.
+ */
+
+void u_upload_flush( struct u_upload_mgr *upload );
+
+/**
+ * Unmap upload buffer
+ *
+ * \param upload           Upload manager
+ *
  * This must usually be called prior to firing the command stream
  * which references the upload buffer, as many memory managers either
  * don't like firing a mapped buffer or cause subsequent maps of a
- * fired buffer to wait.  For now, it's easiest just to grab a new
- * buffer.
+ * fired buffer to wait.
  */
-void u_upload_flush( struct u_upload_mgr *upload );
+void u_upload_unmap( struct u_upload_mgr *upload );
 
 /**
  * Sub-allocate new memory from the upload buffer.