From a95ee25b1380f5750d6d005900a14967d7eac5d6 Mon Sep 17 00:00:00 2001
From: llyyr <llyyr.public@gmail.com>
Date: Fri, 9 Jan 2026 01:34:21 +0530
Subject: [PATCH] vulkan/wsi/headless: populate
 VkSurfacePresentModeCompatibilityKHR

Previously, we ignored this struct which caused VVL to treat the
compatible mode list as NULL, causing false positive validation errors
on headless applications.

Closes: #14622

Cc: mesa-stable
Signed-off-by: llyyr <llyyr.public@gmail.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
(cherry picked from commit 9cd5a4849a1c4060141a99739ffc1aa514e206d5)

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39462>
---
 .pick_status.json                    |  2 +-
 src/vulkan/wsi/wsi_common_headless.c | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/.pick_status.json b/.pick_status.json
index d6553e7bff0..a806f395b77 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -1384,7 +1384,7 @@
         "description": "vulkan/wsi/headless: populate VkSurfacePresentModeCompatibilityKHR",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null,
         "notes": null
diff --git a/src/vulkan/wsi/wsi_common_headless.c b/src/vulkan/wsi/wsi_common_headless.c
index 236e092c522..a7d73e7c3e3 100644
--- a/src/vulkan/wsi/wsi_common_headless.c
+++ b/src/vulkan/wsi/wsi_common_headless.c
@@ -100,6 +100,9 @@ wsi_headless_surface_get_capabilities2(VkIcdSurfaceBase *surface,
 {
    assert(caps->sType == VK_STRUCTURE_TYPE_SURFACE_CAPABILITIES_2_KHR);
 
+   const VkSurfacePresentModeKHR *present_mode =
+      vk_find_struct_const(info_next, SURFACE_PRESENT_MODE_EXT);
+
    VkResult result =
       wsi_headless_surface_get_capabilities(surface, wsi_device,
                                       &caps->surfaceCapabilities);
@@ -111,6 +114,23 @@ wsi_headless_surface_get_capabilities2(VkIcdSurfaceBase *surface,
          protected->supportsProtected = VK_FALSE;
          break;
       }
+      case VK_STRUCTURE_TYPE_SURFACE_PRESENT_MODE_COMPATIBILITY_KHR: {
+         /* Unsupported */
+         VkSurfacePresentModeCompatibilityKHR *compat = (void *)ext;
+         if (compat->pPresentModes == NULL) {
+            if (!present_mode) {
+               wsi_common_vk_warn_once("Use of VkSurfacePresentModeCompatibilityKHR "
+                                       "without a VkSurfacePresentModeKHR set. This is an "
+                                       "application bug.\n");
+            }
+            compat->presentModeCount = 1;
+         } else if (compat->presentModeCount) {
+            assert(present_mode);
+            compat->presentModeCount = 1;
+            compat->pPresentModes[0] = present_mode->presentMode;
+         }
+         break;
+      }
 
       default:
          /* Ignored */