gallium: notify drivers about possible changes in user buffer contents

Also implement the redefine_user_buffer hook in the drivers.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/util/u_transfer.c b/src/gallium/auxiliary/util/u_transfer.c
index e2828cfd99e..b6c63d9642f 100644
--- a/src/gallium/auxiliary/util/u_transfer.c
+++ b/src/gallium/auxiliary/util/u_transfer.c
@@ -112,3 +112,10 @@ void u_default_transfer_destroy(struct pipe_context *pipe,
    FREE(transfer);
 }
 
+void u_default_redefine_user_buffer(struct pipe_context *ctx,
+                                    struct pipe_resource *resource,
+                                    unsigned offset,
+                                    unsigned size)
+{
+   resource->width0 = MAX2(resource->width0, offset + size);
+}