setting to prefer os native file dialog uis (off by default because they are slow and bad)

src/os/gfx/linux/os_gfx_linux.c

@@ -680,6 +680,12 @@ os_graphical_message(B32 error, String8 title, String8 message)
   fprintf(stderr, "%.*s\n\n", str8_varg(message));
 }
 
+internal String8
+os_graphical_pick_file(Arena *arena, String8 initial_path)
+{
+  return str8_zero();
+}
+
 ////////////////////////////////
 //~ rjf: @os_hooks Shell Operations
 

src/os/gfx/os_gfx.h

@@ -191,6 +191,7 @@ internal void           os_set_cursor(OS_Cursor cursor);
 //~ rjf: @os_hooks Native User-Facing Graphical Messages (Implemented Per-OS)
 
 internal void           os_graphical_message(B32 error, String8 title, String8 message);
+internal String8        os_graphical_pick_file(Arena *arena, String8 initial_path);
 
 ////////////////////////////////
 //~ rjf: @os_hooks Shell Operations

src/os/gfx/stub/os_gfx_stub.c

@@ -242,6 +242,12 @@ os_graphical_message(B32 error, String8 title, String8 message)
 {
 }
 
+internal String8
+os_graphical_pick_file(Arena *arena, String8 initial_path)
+{
+  return str8_zero();
+}
+
 ////////////////////////////////
 //~ rjf: @os_hooks Shell Operations
 

src/os/gfx/win32/os_gfx_win32.c

@@ -1577,6 +1577,29 @@ os_graphical_message(B32 error, String8 title, String8 message)
   scratch_end(scratch);
 }
 
+internal String8
+os_graphical_pick_file(Arena *arena, String8 initial_path)
+{
+  String8 result = {0};
+  {
+    Temp scratch = scratch_begin(&arena, 1);
+    U64 buffer_size = 4096;
+    U16 *buffer = push_array(scratch.arena, U16, buffer_size);
+    OPENFILENAMEW params = {sizeof(params)};
+    {
+      params.lpstrFile = (WCHAR *)buffer;
+      params.nMaxFile = buffer_size;
+      params.lpstrInitialDir = (WCHAR *)str16_from_8(scratch.arena, initial_path).str;
+    }
+    if(GetOpenFileNameW(&params))
+    {
+      result = str8_from_16(arena, str16_cstring((U16 *)buffer));
+    }
+    scratch_end(scratch);
+  }
+  return result;
+}
+
 ////////////////////////////////
 //~ rjf: @os_hooks Shell Operations
 

src/os/gfx/win32/os_gfx_win32.h

@@ -15,6 +15,7 @@
 #pragma comment(lib, "UxTheme")
 #pragma comment(lib, "ole32")
 #pragma comment(lib, "user32")
+#pragma comment(lib, "comdlg32")
 #ifndef WM_NCUAHDRAWCAPTION
 #define WM_NCUAHDRAWCAPTION (0x00AE)
 #endif