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backend: Add capability bitmask

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This allows for a more robust an extensible way to advertise features
that a backend is capable of.
This commit is contained in:
Scott Anderson 2019-02-12 12:10:25 +13:00
parent 9e49ceb129
commit 4666fc78a0
1 changed files with 37 additions and 0 deletions
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37
include/wlr/backend.h
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@ -15,8 +15,45 @@
struct wlr_backend_impl;
enum wlr_backend_capability {
/*
* This backend supports input devices.
* New input devices are advertised with the 'new_input' event.
*/
WLR_BACKEND_CAP_INPUT = 1 << 0,
/*
* This backend supports graphical outputs.
* New outputs are advertised with the 'new_output' event.
*/
WLR_BACKEND_CAP_OUTPUT = 1 << 1,
/*
* This backend takes control of the login session or 'seat'.
* See the wlr_session type for more details.
*/
WLR_BACKEND_CAP_SESSION = 1 << 2,
/*
* This backend is capable of setting an output's mode (resolution) to
* an arbitrary value. If this is not supported, you must use a mode
* listed by the wlr_output.
*/
WLR_BACKEND_CAP_ARBITRARY_MODES = 1 << 3,
/*
* This backend supports setting cursors without requiring them to be
* composited to the main framebuffer. Some backends may have extra
* restrictions for what it can accept as a valid hardware cursor.
*/
WLR_BACKEND_CAP_HARDWARE_CURSOR = 1 << 4,
/*
* This backend supports accurate feedback for when a frame is
* presented to an output. This is relevant to the wp_presentation
* protocol.
*/
WLR_BACKEND_CAP_PRESENTATION_TIME = 1 << 5,
};
struct wlr_backend {
const struct wlr_backend_impl *impl;
uint32_t capabilities; // Bitmask of enum wlr_backend_capability
struct {
/** Raised when destroyed, passed the wlr_backend reference */