gallium: add flag PIPE_TRANSFER_MAP_PERMANENTLY

Please see the diff for further info.

This paves the way for moving user buffer uploads out of drivers and should
allow to clean up the mess in u_upload_mgr in the meantime.

For now only allowed for buffers on r300 and r600.

Acked-by: Christian König <[email protected]>

1 files changed, 7 insertions, 1 deletions

diff --git a/src/gallium/drivers/nouveau/nouveau_buffer.c b/src/gallium/drivers/nouveau/nouveau_buffer.c
index f822625af90..02186ba3739 100644
--- a/src/gallium/drivers/nouveau/nouveau_buffer.c
+++ b/src/gallium/drivers/nouveau/nouveau_buffer.c
@@ -172,7 +172,13 @@ nouveau_buffer_transfer_get(struct pipe_context *pipe,
 {
    struct nv04_resource *buf = nv04_resource(resource);
    struct nouveau_context *nv = nouveau_context(pipe);
-   struct nouveau_transfer *xfr = CALLOC_STRUCT(nouveau_transfer);
+   struct nouveau_transfer *xfr;
+
+   if (usage & PIPE_TRANSFER_MAP_PERMANENTLY) {
+      return NULL;
+   }
+
+   xfr = CALLOC_STRUCT(nouveau_transfer);
    if (!xfr)
       return NULL;