record & restore target window on runs

src/os/gfx/linux/os_gfx_linux.c

@@ -327,6 +327,23 @@ os_dpi_from_window(OS_Handle handle)
   return 96.f;
 }
 
+////////////////////////////////
+//~ rjf: @os_hooks External Windows (Implemented Per-OS)
+
+internal OS_Handle
+os_focused_external_window(void)
+{
+  OS_Handle result = {0};
+  // TODO(rjf)
+  return result;
+}
+
+internal void
+os_focus_external_window(OS_Handle handle)
+{
+  // TODO(rjf)
+}
+
 ////////////////////////////////
 //~ rjf: @os_hooks Monitors (Implemented Per-OS)
 

src/os/gfx/os_gfx.h

@@ -163,6 +163,12 @@ internal Rng2F32        os_rect_from_window(OS_Handle window);
 internal Rng2F32        os_client_rect_from_window(OS_Handle window);
 internal F32            os_dpi_from_window(OS_Handle window);
 
+////////////////////////////////
+//~ rjf: @os_hooks External Windows (Implemented Per-OS)
+
+internal OS_Handle      os_focused_external_window(void);
+internal void           os_focus_external_window(OS_Handle handle);
+
 ////////////////////////////////
 //~ rjf: @os_hooks Monitors (Implemented Per-OS)
 

src/os/gfx/stub/os_gfx_stub.c

@@ -149,6 +149,23 @@ os_dpi_from_window(OS_Handle window)
   return 96.f;
 }
 
+////////////////////////////////
+//~ rjf: @os_hooks External Windows (Implemented Per-OS)
+
+internal OS_Handle
+os_focused_external_window(void)
+{
+  OS_Handle result = {0};
+  // TODO(rjf)
+  return result;
+}
+
+internal void
+os_focus_external_window(OS_Handle handle)
+{
+  // TODO(rjf)
+}
+
 ////////////////////////////////
 //~ rjf: @os_hooks Monitors (Implemented Per-OS)
 

src/os/gfx/win32/os_gfx_win32.c

@@ -1367,6 +1367,25 @@ os_dpi_from_window(OS_Handle handle)
   return result;
 }
 
+////////////////////////////////
+//~ rjf: @os_hooks External Windows (Implemented Per-OS)
+
+internal OS_Handle
+os_focused_external_window(void)
+{
+  HWND hwnd = GetForegroundWindow();
+  OS_Handle result = {(U64)hwnd};
+  return result;
+}
+
+internal void
+os_focus_external_window(OS_Handle handle)
+{
+  HWND hwnd = (HWND)handle.u64[0];
+  SetForegroundWindow(hwnd);
+  SetFocus(hwnd);
+}
+
 ////////////////////////////////
 //~ rjf: @os_hooks Monitors (Implemented Per-OS)