lovr.focus;

This may not work in all cases involving e.g. overlays.

src/api/event.c

@@ -19,6 +19,12 @@ static int nextEvent(lua_State* L) {
       return 2;
     }
 
+    case EVENT_FOCUS: {
+      lua_pushstring(L, "focus");
+      lua_pushboolean(L, event->data.focus.isFocused);
+      return 2;
+    };
+
     case EVENT_CONTROLLER_ADDED: {
       lua_pushstring(L, "controlleradded");
       luax_pushtype(L, Controller, event->data.controlleradded.controller);
@@ -90,6 +96,10 @@ int l_lovrEventPush(lua_State* L) {
       data.quit.exitCode = luaL_optint(L, 2, 0);
       break;
 
+    case EVENT_FOCUS:
+      data.focus.isFocused = lua_toboolean(L, 2);
+      break;
+
     case EVENT_CONTROLLER_ADDED:
       data.controlleradded.controller = luax_checktype(L, 2, Controller);
       break;

src/event/event.h

@@ -5,6 +5,7 @@
 
 typedef enum {
   EVENT_QUIT,
+  EVENT_FOCUS,
   EVENT_CONTROLLER_ADDED,
   EVENT_CONTROLLER_REMOVED,
   EVENT_CONTROLLER_PRESSED,
@@ -15,6 +16,10 @@ typedef struct {
   int exitCode;
 } QuitEvent;
 
+typedef struct {
+  int isFocused;
+} FocusEvent;
+
 typedef struct {
   Controller* controller;
 } ControllerAddedEvent;
@@ -35,6 +40,7 @@ typedef struct {
 
 typedef union {
   QuitEvent quit;
+  FocusEvent focus;
   ControllerAddedEvent controlleradded;
   ControllerRemovedEvent controllerremoved;
   ControllerPressedEvent controllerpressed;

src/headset/openvr.c

@@ -154,6 +154,14 @@ void lovrHeadsetPoll() {
         }
         break;
       }
+
+      case EVREventType_VREvent_InputFocusCaptured:
+      case EVREventType_VREvent_InputFocusReleased:
+        int isFocused = vrEvent.eventType == EVREventType_VREvent_InputFocusReleased;
+        EventData data = { .focus = { isFocused } };
+        Event event = { .type = EVENT_FOCUS, .data = data };
+        lovrEventPush(event);
+        break;
     }
   }
 }

src/lovr.c

@@ -113,6 +113,9 @@ void lovrInit(lua_State* L, int argc, char** argv) {
 
     "lovr.handlers = setmetatable({ "
     "  quit = function() end, "
+    "  focus = function(f) "
+    "    if lovr.focus then lovr.focus(f) end "
+    "  end, "
     "  controlleradded = function(c) "
     "    if lovr.controlleradded then lovr.controlleradded(c) end "
     "  end, "