chore(packaging): Add VK_ICD path to session

Author: DashieTM

nix/hm.nix

@@ -2,11 +2,19 @@ self: {
   config,
   pkgs,
   lib,
+  system,
   ...
 }: let
   cfg = config.programs.oxirun;
   defaultPackage = self.packages.${pkgs.stdenv.hostPlatform.system}.default;
   oxirun-applications = self.packages.${pkgs.stdenv.hostPlatform.system}.oxirun-applications;
+  driverIcdPath = "${pkgs.mesa}/share/vulkan/icd.d";
+  icdArch =
+    if system == "x86_64-linux"
+    then "x86_64"
+    else if system == "aarch64-linux"
+    then "aarch64"
+    else "x86_64";
 in {
   meta.maintainers = with lib.maintainers; [DashieTM];
   options.programs.oxirun = with lib; {
@@ -33,6 +41,10 @@ in {
         '';
       };
 
+      home.sessionVariables = {
+        VK_ICD_FILENAMES = "${driverIcdPath}/radeon_icd.${icdArch}.json:${driverIcdPath}/intel_icd.${icdArch}.json";
+      };
+
       plugin_config = mkOption {
         type = with types; attrs;
         default = {};