gallium: unify transfer functions

"get_transfer + transfer_map" becomes "transfer_map".
"transfer_unmap + transfer_destroy" becomes "transfer_unmap".

transfer_map must create and return the transfer object and transfer_unmap
must destroy it.

transfer_map is successful if the returned buffer pointer is not NULL.
If transfer_map fails, the pointer to the transfer object remains unchanged
(i.e. doesn't have to be NULL).

Acked-by: Brian Paul <[email protected]>

1 files changed, 27 insertions, 36 deletions

diff --git a/src/gallium/drivers/nv50/nv50_transfer.c b/src/gallium/drivers/nv50/nv50_transfer.c
index b960dc0d191..25319d785e4 100644
--- a/src/gallium/drivers/nv50/nv50_transfer.c
+++ b/src/gallium/drivers/nv50/nv50_transfer.c
@@ -246,19 +246,22 @@ nv50_m2mf_copy_linear(struct nouveau_context *nv,
    nouveau_bufctx_reset(bctx, 0);
 }
 
-struct pipe_transfer *
-nv50_miptree_transfer_new(struct pipe_context *pctx,
+void *
+nv50_miptree_transfer_map(struct pipe_context *pctx,
                           struct pipe_resource *res,
                           unsigned level,
                           unsigned usage,
-                          const struct pipe_box *box)
+                          const struct pipe_box *box,
+                          struct pipe_transfer **ptransfer)
 {
+   struct nv50_screen *screen = nv50_screen(pctx->screen);
    struct nv50_context *nv50 = nv50_context(pctx);
    struct nouveau_device *dev = nv50->screen->base.device;
    const struct nv50_miptree *mt = nv50_miptree(res);
    struct nv50_transfer *tx;
    uint32_t size;
    int ret;
+   unsigned flags = 0;
 
    if (usage & PIPE_TRANSFER_MAP_DIRECTLY)
       return NULL;
@@ -320,12 +323,30 @@ nv50_miptree_transfer_new(struct pipe_context *pctx,
       tx->rect[1].base = 0;
    }
 
-   return &tx->base;
+   if (tx->rect[1].bo->map) {
+      *ptransfer = &tx->base;
+      return tx->rect[1].bo->map;
+   }
+
+   if (usage & PIPE_TRANSFER_READ)
+      flags = NOUVEAU_BO_RD;
+   if (usage & PIPE_TRANSFER_WRITE)
+      flags |= NOUVEAU_BO_WR;
+
+   ret = nouveau_bo_map(tx->rect[1].bo, flags, screen->base.client);
+   if (ret) {
+      nouveau_bo_ref(NULL, &tx->rect[1].bo);
+      FREE(tx);
+      return NULL;
+   }
+
+   *ptransfer = &tx->base;
+   return tx->rect[1].bo->map;
 }
 
 void
-nv50_miptree_transfer_del(struct pipe_context *pctx,
-                          struct pipe_transfer *transfer)
+nv50_miptree_transfer_unmap(struct pipe_context *pctx,
+                            struct pipe_transfer *transfer)
 {
    struct nv50_context *nv50 = nv50_context(pctx);
    struct nv50_transfer *tx = (struct nv50_transfer *)transfer;
@@ -350,36 +371,6 @@ nv50_miptree_transfer_del(struct pipe_context *pctx,
    FREE(tx);
 }
 
-void *
-nv50_miptree_transfer_map(struct pipe_context *pctx,
-                          struct pipe_transfer *transfer)
-{
-   struct nv50_screen *screen = nv50_screen(pctx->screen);
-   struct nv50_transfer *tx = (struct nv50_transfer *)transfer;
-   int ret;
-   unsigned flags = 0;
-
-   if (tx->rect[1].bo->map)
-      return tx->rect[1].bo->map;
-
-   if (transfer->usage & PIPE_TRANSFER_READ)
-      flags = NOUVEAU_BO_RD;
-   if (transfer->usage & PIPE_TRANSFER_WRITE)
-      flags |= NOUVEAU_BO_WR;
-
-   ret = nouveau_bo_map(tx->rect[1].bo, flags, screen->base.client);
-   if (ret)
-      return NULL;
-   return tx->rect[1].bo->map;
-}
-
-void
-nv50_miptree_transfer_unmap(struct pipe_context *pctx,
-                            struct pipe_transfer *transfer)
-{
-   /* nothing to do */
-}
-
 void
 nv50_cb_push(struct nouveau_context *nv,
              struct nouveau_bo *bo, unsigned domain,