[Mesa-dev] [PATCH 2/2] radv: force enable VK_AMD_shader_ballot for Wolfenstein Youngblood

[Samuel Pitoiset]

This gives a nice boost, +20% at this time on my Vega 56. Shader
ballot should be enabled by default at some point but it reduces
performance a bit (-6%) with Wolfeinstein II. Enable it only for
Youngblood at the moment, like what we did for Talos in the past.

As a bonus point, it gets rid of some minor artifacts that only
happens when ballot is disabled for some reasons.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
---
 src/amd/vulkan/radv_device.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/amd/vulkan/radv_device.c b/src/amd/vulkan/radv_device.c
index 49518d43218..c04f6a27e82 100644
--- a/src/amd/vulkan/radv_device.c
+++ b/src/amd/vulkan/radv_device.c
@@ -554,6 +554,14 @@ radv_handle_per_app_options(struct radv_instance *instance,
 		 */
 		if (HAVE_LLVM < 0x900)
 			instance->debug_flags |= RADV_DEBUG_NO_LOAD_STORE_OPT;
+	} else if (!strcmp(name, "Wolfenstein: Youngblood")) {
+		if (!(instance->debug_flags & RADV_DEBUG_NO_SHADER_BALLOT)) {
+			/* Force enable VK_AMD_shader_ballot because it looks
+			 * safe and it gives a nice boost (+20% on Vega 56 at
+			 * this time).
+			 */
+			instance->perftest_flags |= RADV_PERFTEST_SHADER_BALLOT;
+		}
 	}
 }
 
-- 
2.22.1