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fifo-v1: new protocol implementation

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Implement fifo-v1 protocol: the capability for clients to explicitly queue wl_surface
commits.

The design of the wl_surface interface defines a double buffer, which is intended to support only
(from the point of view of the client) what is sometimes called the 'mailbox' presentation mode:
each request on a wl_surface operates on an accumulated pending state until a .commit request is
issued, immediately and atomically replacing the wl_surface's current state. This means that only
the state related to the latest .commit request will be latched onto.

fifo-v1 is a protocol that aims to support an important use case, namely the FIFO display
presentation mode, which allows to queue the accumulated pending state until the next latching
deadline occurs.

Signed-off-by: Sergio Gómez <sergio.g.delreal@gmail.com>
This commit is contained in:
Sergio Gómez 2025-11-26 10:55:35 -05:00
parent f73b8e1ea8
commit c78bce9cc2
4 changed files with 473 additions and 0 deletions
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protocol/meson.build
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@ -36,6 +36,7 @@ protocols = {
'ext-image-copy-capture-v1': wl_protocol_dir / 'staging/ext-image-copy-capture/ext-image-copy-capture-v1.xml',
'ext-session-lock-v1': wl_protocol_dir / 'staging/ext-session-lock/ext-session-lock-v1.xml',
'ext-data-control-v1': wl_protocol_dir / 'staging/ext-data-control/ext-data-control-v1.xml',
'fifo-v1': wl_protocol_dir / 'staging/fifo/fifo-v1.xml',
'fractional-scale-v1': wl_protocol_dir / 'staging/fractional-scale/fractional-scale-v1.xml',
'linux-drm-syncobj-v1': wl_protocol_dir / 'staging/linux-drm-syncobj/linux-drm-syncobj-v1.xml',
'security-context-v1': wl_protocol_dir / 'staging/security-context/security-context-v1.xml',