freedreno: shadow textures if possible to avoid stall/flush

To make batch re-ordering useful, we need to be able to create shadow
resources to avoid a flush/stall in transfer_map().  For example,
uploading new texture contents or updating a UBO mid-batch.  In these
cases, we want to clone the buffer, and update the new buffer, leaving
the old buffer (whose reference is held by cmdstream) as a shadow.

This is done by blitting the remaining other levels (and whatever part
of current level that is not discarded) from the old/shadow buffer to
the new one.

Signed-off-by: Rob Clark <[email protected]>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/gallium/drivers/freedreno/freedreno_context.h b/src/gallium/drivers/freedreno/freedreno_context.h
index f25ec34758f..c0004fabeaa 100644
--- a/src/gallium/drivers/freedreno/freedreno_context.h
+++ b/src/gallium/drivers/freedreno/freedreno_context.h
@@ -299,6 +299,11 @@ struct fd_context {
 	bool cond_cond; /* inverted rendering condition */
 	uint cond_mode;
 
+	/* Are we in process of shadowing a resource? Used to detect recursion
+	 * in transfer_map, and skip unneeded synchronization.
+	 */
+	bool in_shadow;
+
 	struct pipe_debug_callback debug;
 
 	/* GMEM/tile handling fxns: */