nixos/monado: install monado-vulkan-layers (#301044)

nixos/modules/services/hardware/monado.nix

@@ -93,6 +93,8 @@ in
     environment.systemPackages = [ cfg.package ];
     environment.pathsToLink = [ "/share/openxr" ];
 
+    hardware.opengl.extraPackages = [ pkgs.monado-vulkan-layers ];
+
     environment.etc."xdg/openxr/1/active_runtime.json" = mkIf cfg.defaultRuntime {
       source = "${cfg.package}/share/openxr/1/openxr_monado.json";
     };

pkgs/by-name/mo/monado-vulkan-layers/absolute-layer-path.patch

@@ -0,0 +1,12 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index d9a1b56..9a07e69 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -41,6 +41,7 @@ generate_vulkan_api_layer_manifest_at_install(
+ 	RELATIVE_LAYER_DIR ${LAYER_INSTALLDIR}
+ 	DESTINATION ${CMAKE_INSTALL_DATADIR}/vulkan/implicit_layer.d
+ 	COMPONENT vulkan_layer
++	ABSOLUTE_LAYER_PATH
+ 	)
+ 
+ set(CPACK_COMPONENT_vulkan_layer_DISPLAY_NAME "Timeline Semaphore Vulkan Implicit Layer")

pkgs/by-name/mo/monado-vulkan-layers/package.nix

@@ -0,0 +1,44 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitLab,
+  cmake,
+  vulkan-headers,
+  vulkan-loader,
+}:
+stdenv.mkDerivation {
+  pname = "monado-vulkan-layers";
+  version = "0-unstable-2024-02-21";
+
+  src = fetchFromGitLab {
+    domain = "gitlab.freedesktop.org";
+    owner = "monado";
+    repo = "utilities/vulkan-layers";
+    rev = "ae43cdcbd25c56e3481bbc8a0ce2bfcebba9f7c2";
+    sha256 = "sha256-QabYVKcenW+LQ+QSjUoQOLOQAVHdjE0YXd+1WsdzNPc=";
+  };
+
+  nativeBuildInputs = [
+    cmake
+  ];
+
+  buildInputs = [
+    vulkan-headers
+    vulkan-loader
+  ];
+
+  patches = [
+    ./absolute-layer-path.patch
+  ];
+
+  meta = with lib; {
+    description = "Vulkan Layers for Monado";
+    homepage = "https://gitlab.freedesktop.org/monado/utilities/vulkan-layers";
+    platforms = platforms.linux;
+    license = licenses.boost;
+    maintainers = with maintainers; [
+      Scrumplex
+      passivelemon
+    ];
+  };
+}