[Mesa-dev] [PATCH 1/2] gallium/util: set correct usage flags in u_default_transfer_inline_write

[Marek Olšák]

The DISCARD flags should improve performance in drivers which handle them.
---
 src/gallium/auxiliary/util/u_transfer.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_transfer.c b/src/gallium/auxiliary/util/u_transfer.c
index 7e72a59..1fa8d94 100644
--- a/src/gallium/auxiliary/util/u_transfer.c
+++ b/src/gallium/auxiliary/util/u_transfer.c
@@ -21,6 +21,18 @@ void u_default_transfer_inline_write( struct pipe_context *pipe,
    const uint8_t *src_data = data;
    unsigned i;
 
+   assert(!(usage & PIPE_TRANSFER_READ));
+
+   /* the write flag is implicit by the nature of transfer_inline_write */
+   usage |= PIPE_TRANSFER_WRITE;
+
+   /* transfer_inline_write implicitly discards the rewritten buffer range */
+   if (box->x == 0 && box->width == resource->width0) {
+      usage |= PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE;
+   } else {
+      usage |= PIPE_TRANSFER_DISCARD_RANGE;
+   }
+
    transfer = pipe->get_transfer(pipe,
                                  resource,
                                  level,
-- 
1.7.5.4