Seg Fault when calling root.set_fullscreen on MacOS Mojave

[tytrdev]

Following the roguelike tutorial I ended up with this function to handle key presses.

Alt + Enter should toggle the screen between fullscreen and the configured window size.
However, when I call root.set_fullscreen I am getting a Segmentation Fault without much other output as to what the exact error could be.

Here is the code:

fn handle_keys(root: &mut Root, x: &mut i32, y: &mut i32) -> bool {
  let key = root.wait_for_keypress(true);
  
  match key {
    // movement keys
    Key { code: Up, .. } => *y -= 1,
    Key { code: Down, .. } => *y += 1,
    Key { code: Left, .. } => *x -= 1,
    Key { code: Right, .. } => *x += 1,
    Key { code: Enter, alt: true, .. } => {
      // Alt+Enter: toggle fullscreen
      let fullscreen = root.is_fullscreen();
      println!("{}", fullscreen);
      root.set_fullscreen(!fullscreen);
    }
    Key { code: Escape, .. } => return true,  // exit game
    _ => {},
  }

  return false;
}

On a side note, I think I will be leaving the mac world for good pretty soon.

[jneumann]

I also ran into this on Sierra (10.12.6). I'm not sure what other information you need to help you debug the issue.

[rokob]

Here is the stacktrace:

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libtcod.dylib                 	0x0000000104a4673b find_resolution + 459 (sys_sdl_c.c:452)
1   libtcod.dylib                 	0x0000000104a43e1c TCOD_sys_set_fullscreen + 60 (sys_sdl_c.c:1240)
2   libtcod.dylib                 	0x0000000104a1406a TCOD_console_set_fullscreen + 90 (console_c.c:137)
3   roguelike                     	0x0000000104966651 tcod::console::Root::set_fullscreen::h489e87843682dd90 + 33 (console.rs:233)
4   roguelike                     	0x0000000104960a47 roguelike::handle_keys::hb6865f503e2e50f5 + 215 (main.rs:111)
5   roguelike                     	0x00000001049608c3 roguelike::main::h788343338086fc09 + 1379 (main.rs:99)
6   roguelike                     	0x000000010495fec2 std::rt::lang_start::_$u7b$$u7b$closure$u7d$$u7d$::hc0f517b52b1fe0ff + 18 (rt.rs:74)
7   roguelike                     	0x0000000104973078 std::panicking::try::do_call::hcfe6ac53944e0624 + 24 (panicking.rs:310)
8   roguelike                     	0x000000010497f7ff __rust_maybe_catch_panic + 31 (lib.rs:111)
9   roguelike                     	0x000000010496ee9d std::rt::lang_start_internal::hb972e1f76be57958 + 237 (panicking.rs:294)
10  roguelike                     	0x000000010495fea2 std::rt::lang_start::he93384e8863926d4 + 66 (rt.rs:74)
11  roguelike                     	0x0000000104960ac2 main + 34
12  libdyld.dylib                 	0x00007fff53d88015 start + 1

[rokob]

Probably because I am using the GLSL renderer and not SDL so the sdl deref in find_resolution is the seg fault.

[rokob]

Yeah changing back to the default SDL renderer fixes it, but brings back the issue of having a blank screen until hitting a key including when going to fullscreen and back.

[L3nn0x]

Looks like it's coming from libtcod and not us. Moving to the latest version might help with it. I'll try looking into it when I have time.It could also be Mojave. As they broke quite a few OpenGL things with their latest release, that might be included in it.
It could also be Mojave. As they broke quite a few OpenGL things with their latest release, that might be included in it. If that's the problem, I recommend either changing OS or not using OpenGL until Apple or SDL fixes it.

[glfmn]

I was having a similar issue on

Linux tpy12 4.15.0-43-generic #46-Ubuntu SMP Thu Dec 6 14:45:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

After entering fullscreen, I would have to manually kill the process from another TTY to regain control.