Use XAppGpuOffloadHelper for gpu offloading, respect

PrefersNonDefaultGPU desktop entry key.

XApp.util_gpu_offload_supported() is still used as a fallback
for older libxapp versions.

usr/lib/linuxmint/mintMenu/mintMenu.py

@@ -10,6 +10,7 @@ import traceback
 import gi
 gi.require_version("Gtk", "3.0")
 gi.require_version('MatePanelApplet', '4.0')
+gi.require_version('XApp', '1.0')
 from gi.repository import Gtk, GdkPixbuf, Gdk, GObject
 from gi.repository import MatePanelApplet
 from gi.repository import Gio

usr/lib/linuxmint/mintMenu/plugins/applications.py

@@ -191,6 +191,10 @@ class pluginclass(object):
 
         self.canOffload = False
 
+        try:
+            helper = XApp.GpuOffloadHelper.get_sync()
+            self.canOffload = helper.is_offload_supported()
+        except AttributeError:
             try:
                 self.canOffload = XApp.util_gpu_offload_supported()
             except AttributeError:

usr/lib/linuxmint/mintMenu/plugins/easybuttons.py

@@ -268,6 +268,7 @@ class ApplicationLauncher(easyButton):
             self.appMateDocPath = desktopItem.get("X-MATE-DocPath") or ""
             self.useTerminal = desktopItem.getTerminal()
             self.appPath = desktopItem.getPath()
+            self.prefersOffload = desktopItem.get("PrefersNonDefaultGPU", "Desktop Entry", type="boolean")
 
             if not self.appMateDocPath:
                 self.appKdeDocPath      = desktopItem.getDocPath() or ""
@@ -355,6 +356,9 @@ class ApplicationLauncher(easyButton):
                 except KeyError:
                     pass
 
+                if self.prefersOffload:
+                    offload = True
+
                 Execute(None, desktopFile=self.desktopFile, offload=offload)
 
     def uninstall(self, *args):

usr/lib/linuxmint/mintMenu/plugins/execute.py

@@ -1,7 +1,7 @@
 #!/usr/bin/python3
 
 import os
-from gi.repository import Gio, GLib, Gdk
+from gi.repository import Gio, GLib, Gdk, XApp
 
 
 def RemoveArgs(Execline):
@@ -32,6 +32,17 @@ def Execute(cmd , commandCwd=None, desktopFile=None, offload=False):
         if offload:
             print("Offloading '%s' to discrete gpu." % launcher.get_name());
 
+            try:
+                helper = XApp.GpuOffloadHelper.get_sync()
+                infos = helper.get_offload_infos()
+
+                if infos:
+                    i = 0
+                    env_strv = infos[0].env_strv
+                    while i < len(env_strv):
+                        context.setenv(env_strv[i], env_strv[i + 1])
+                        i += 2
+            except AttributeError:
                 context.setenv("__NV_PRIME_RENDER_OFFLOAD", "1")
                 context.setenv("__GLX_VENDOR_LIBRARY_NAME", "nvidia");