[Mesa-dev] [PATCH] radv: skip draws with instance_count == 0

[Samuel Pitoiset]

Loosely based on RadeonSI.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
---
 src/amd/vulkan/radv_cmd_buffer.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/amd/vulkan/radv_cmd_buffer.c b/src/amd/vulkan/radv_cmd_buffer.c
index 1966098e08c..8e3f1a7f5f0 100644
--- a/src/amd/vulkan/radv_cmd_buffer.c
+++ b/src/amd/vulkan/radv_cmd_buffer.c
@@ -3697,6 +3697,20 @@ radv_draw(struct radv_cmd_buffer *cmd_buffer,
 		radeon_check_space(cmd_buffer->device->ws,
 				   cmd_buffer->cs, 4096);
 
+	if (likely(!info->indirect)) {
+		/* SI-CI treat instance_count==0 as instance_count==1. There is
+		 * no workaround for indirect draws, but we can at least skip
+		 * direct draws.
+		 */
+		if (unlikely(!info->instance_count))
+			return;
+
+		/* Handle count == 0. */
+		if (unlikely(!info->count &&
+			     (info->indexed || !info->strmout_buffer)))
+			return;
+	}
+
 	/* Use optimal packet order based on whether we need to sync the
 	 * pipeline.
 	 */
-- 
2.20.1