Some interesting output when debugging tetra examples or games

[johanlindfors]

I am using Visual Studio Code to develop with tetra on MacOS, and it's a very nice environment after having added the "LLDB" and "Rust (rls)" extensions. By adding launch configurations (Visual Studio Code automatically adds debug configurations by examining cargo.toml), I can debug and set breakpoints.

An interesting aspect though is that when running any sample I get the following output in the debug terminal, this is prior to having done any explicit graphics::draw call:

2019-11-24 10:54:51.396156+0100 tetras[9199:547938] [plugin] AddInstanceForFactory: No factory registered for id <CFUUID 0x1011042c0> F8BB1C28-BAE8-11D6-9C31-00039315CD46 2019-11-24 10:54:51.417284+0100 tetras[9199:547938] HALC_ShellDriverPlugIn::Open: Can't get a pointer to the Open routine 2019-11-24 10:54:51.417528+0100 tetras[9199:547938] HALC_ShellDriverPlugIn::Open: Can't get a pointer to the Open routine 2019-11-24 10:54:51.604498+0100 tetras[9199:547992] flock failed to lock maps file: errno = 35 2019-11-24 10:54:51.604770+0100 tetras[9199:547992] flock failed to lock maps file: errno = 35 2019-11-24 10:55:27.478664+0100 tetras[9199:547938] [tetras] CGContextSetFillColorWithColor: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. 2019-11-24 10:55:27.478692+0100 tetras[9199:547938] [tetras] CGContextGetCompositeOperation: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. 2019-11-24 10:55:27.478700+0100 tetras[9199:547938] [tetras] CGContextSetCompositeOperation: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. 2019-11-24 10:55:27.478706+0100 tetras[9199:547938] [tetras] CGContextFillRects: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. 2019-11-24 10:55:27.478713+0100 tetras[9199:547938] [tetras] CGContextSetCompositeOperation: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.

The code will run and work as expected but maybe you have some ideas on what might be causing this? Feel free to close this if it's "expected" behaviour.

[17cupsofcoffee]

I found an instance of someone getting the same output, and it seems to originate from SDL2: gameprogcpp/code#24

The developer of that project noted that updating SDL2 fixed crashes on Mojave, but they still got the same output on the first frame: gameprogcpp/code#25

So I think this is something upstream in SDL2? I'd be interested to see if you get the same output from another SDL2-based engine (like Love2D or FNA or something like that) - if so, it's probably something that's out of our hands :)

[johanlindfors]

Sorry, but I'm not really certain on how to check which versions of the SDL2 libraries I have installed and is referencing from rust. I used the 'brew upgrade sdl2' command which installed the latest I guess, but the "errors" are still appearing. On a separate machine it seems I already had the latest libraries, well at least that's what brew told me.

[17cupsofcoffee]

The version in Homebrew is apparently 2.0.10, which is the current SDL version according to their website.