mirror of
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61fd4c099a
Callers may want to get more details about the failure, in particular EPERM indicates that the user isn't DRM master (can happen on VT switch).
78 lines
2.1 KiB
Markdown
78 lines
2.1 KiB
Markdown
# libliftoff
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[](https://builds.sr.ht/~emersion/libliftoff)
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Lightweight KMS plane library.
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libliftoff eases the use of KMS planes from userspace without standing in your
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way. Users create "virtual planes" called layers, set KMS properties on them,
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and libliftoff will pick planes for these layers if possible.
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Resources:
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* [Blog post introducing the project][intro-post]
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* [FOSDEM 2020 talk][fosdem-2020]
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## Building
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Depends on libdrm. Requires universal planes and atomic.
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meson build/
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ninja -C build/
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## Usage
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See [`liftoff.h`][liftoff.h] and the [`example/`][example] directory. See
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[`doc/compositor.md`][doc/compositor] for compositor guidelines.
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Here's the general idea:
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```c
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struct liftoff_device *device;
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struct liftoff_output *output;
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struct liftoff_layer *layer;
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drmModeAtomicReq *req;
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int ret;
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device = liftoff_device_create(drm_fd);
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output = liftoff_output_create(device, crtc_id);
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liftoff_device_register_all_planes(device);
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layer = liftoff_layer_create(output);
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liftoff_layer_set_property(layer, "FB_ID", fb_id);
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/* Probably setup more properties and more layers */
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req = drmModeAtomicAlloc();
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ret = liftoff_output_apply(output, req);
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if (ret < 0) {
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perror("liftoff_output_apply");
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exit(1);
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}
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ret = drmModeAtomicCommit(drm_fd, req, DRM_MODE_ATOMIC_NONBLOCK, NULL);
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if (ret < 0) {
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perror("drmModeAtomicCommit");
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exit(1);
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}
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drmModeAtomicFree(req);
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```
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## Contributing
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Report bugs and send pull requests on [GitHub][github].
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We use the Wayland/Weston style and contribution guidelines, see [Weston's
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contributing document][weston-contributing].
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## License
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MIT
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[liftoff.h]: https://github.com/emersion/libliftoff/blob/master/include/libliftoff.h
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[example]: https://github.com/emersion/libliftoff/tree/master/example
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[doc/compositor]: https://github.com/emersion/libliftoff/blob/master/doc/compositor.md
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[intro-post]: https://emersion.fr/blog/2019/xdc2019-wrap-up/#libliftoff
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[fosdem-2020]: https://fosdem.org/2020/schedule/event/kms_planes/
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[github]: https://github.com/emersion/libliftoff
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[weston-contributing]: https://gitlab.freedesktop.org/wayland/weston/-/blob/master/CONTRIBUTING.md
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