Headless glutin issue

[goddessfreya]

Ports to upcoming glutin 0.21 release. Fixes headless issues. Fixes #12. Based on the headless_glutin_issue branch. Feel free to cherry-pick the necessary changes you want to keep.

Dependent on: rust-windowing/glutin#1125

Resolves rust-windowing/glutin#988, afaik.

[bwasty]

Thanks a lot! I don't have time to take a proper look at the moment, but hopefully soon.

[nick13jaremek]

@zegentzy Nice PR, just what I was looking for!

However, I don't understand why did you remove the glutin dependency and referenced a local glutin directory which does not exist, in the Cargo.toml file. Perhaps I am missing something here?

This could be related to the TravisCI build error.

[goddessfreya]

Glutin 0.21 was not out at the time, so I was using a local copy. Should be fine to just change the version now.

[nick13jaremek]

@zegentzy I updated the Cargo.toml file to explicitly use the 0.21.0 version of glutin, but the cargo build command failed with the error messages shown below.

Perhaps there were some changes in the 0.21.0 glutin crate development cycle from beta to final?

I am using Rust 1.36.0.

error[E0432]: unresolved import `glutin::ContextTrait`
  --> src/viewer.rs:16:5
   |
16 |     ContextTrait,
   |     ^^^^^^^^^^^^
   |     |
   |     no `ContextTrait` in the root
   |     help: a similar name exists in the module: `ContextError`

error[E0107]: wrong number of type arguments: expected 1, found 0
  --> src/viewer.rs:60:23
   |
60 |     gl_window: Option<glutin::WindowedContext>,
   |                       ^^^^^^^^^^^^^^^^^^^^^^^ expected 1 type argument

error[E0107]: wrong number of type arguments: expected 1, found 0
  --> src/viewer.rs:61:29
   |
61 |     pub _gl_context: Option<glutin::Context>,
   |                             ^^^^^^^^^^^^^^^ expected 1 type argument

error[E0107]: wrong number of type arguments: expected 1, found 0
   --> src/viewer.rs:391:17
    |
391 |     gl_window: &glutin::WindowedContext,
    |                 ^^^^^^^^^^^^^^^^^^^^^^^ expected 1 type argument

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0107, E0432.
For more information about an error, try `rustc --explain E0107`.
error: Could not compile `gltf-viewer`.

To learn more, run the command again with --verbose.

[goddessfreya]

Oh yeah, there was. https://gentz.rocks/posts/glutin-v0-21-0-migration-guide/

[nick13jaremek]

@zegentzy Oh, nice! Did not know about that guide. Thank you!