Add primusrun option

lutris/game.py

@@ -130,6 +130,10 @@ class Game(object):
         if system_config.get('reset_pulse'):
             audio.reset_pulse()
 
+        primusrun = system_config.get('primusrun')
+        if primusrun and system.find_executable('primusrun'):
+            launch_arguments.insert(0, 'primusrun')
+
         prefix_command = system_config.get("prefix_command", '').strip()
         if prefix_command and system.find_executable(prefix_command):
             launch_arguments.insert(0, prefix_command)

lutris/sysoptions.py

@@ -49,6 +49,16 @@ system_options = [
         'help': ("Some games don't correctly restores gamma on exit, making "
                  "your display too bright. Select this option to correct it.")
     },
+    {
+        'option': 'primusrun',
+        'type': 'bool',
+        'default': False,
+        'label': 'Use primusrun (NVIDIA Optimus laptops)',
+        'help': ("If you have installed the primus package, selecting this "
+                 "option will run the game with the primusrun command, "
+                 "activating your NVIDIA graphic chip for high 3D "
+                 "performance.")
+    },
     {
         'option': 'display',
         'type': 'choice',