radv: detect command buffers that do no work and drop them (v2)

If a buffer is just full of flushes we flush things on command
buffer submission, so don't bother submitting these.

This will reduce some CPU overhead on dota2, which submits a fair
few command streams that don't end up drawing anything.

v2: reorganise loop to count first then malloc,
rename some vars (Bas)

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/amd/vulkan/radv_private.h b/src/amd/vulkan/radv_private.h
index 25ed5dec7c..9a88ce0d64 100644
--- a/src/amd/vulkan/radv_private.h
+++ b/src/amd/vulkan/radv_private.h
@@ -750,6 +750,8 @@ struct radv_cmd_buffer {
 	uint32_t gsvs_ring_size_needed;
 
 	int ring_offsets_idx; /* just used for verification */
+
+	bool no_draws;
 };
 
 struct radv_image;