From b1bb44cf65fbe3e34d6314ca99063865b4f41c0a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcin=20=C5=9Alusarz?= <marcin.slusarz@intel.com>
Date: Fri, 27 Jan 2023 15:58:35 +0100
Subject: [PATCH] anv: fix how unset gl_Viewport & gl_Layer are handled in mesh
 case

See also: c6f69eea6ac ("anv/pipeline: Properly handle unset gl_Layer and gl_ViewportIndex")

Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17620>
---
 src/intel/vulkan/genX_pipeline.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/intel/vulkan/genX_pipeline.c b/src/intel/vulkan/genX_pipeline.c
index 64ce2b90452..3cbf459c649 100644
--- a/src/intel/vulkan/genX_pipeline.c
+++ b/src/intel/vulkan/genX_pipeline.c
@@ -955,7 +955,12 @@ emit_3dstate_clip(struct anv_graphics_pipeline *pipeline,
       if (vp && vp->viewport_count > 0 &&
           mesh_prog_data->map.start_dw[VARYING_SLOT_VIEWPORT] >= 0) {
          clip.MaximumVPIndex = vp->viewport_count - 1;
+      } else {
+         clip.MaximumVPIndex = 0;
       }
+
+      clip.ForceZeroRTAIndexEnable =
+            mesh_prog_data->map.start_dw[VARYING_SLOT_LAYER] < 0;
    }
 
    clip.NonPerspectiveBarycentricEnable = wm_prog_data ?