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output: don't trigger a frame immediately in schedule_frame

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This desynchronizes our rendering loop with the vblank cycle.

In case a compositor doesn't swap buffers but schedules a frame,
emitting a frame event immediately enters a busy-loop.

Instead, ask the backend to send a frame when appropriate. On
Wayland we can just register a frame callback on our surface. On
DRM we can do a no-op pageflip.

Fixes #617
Fixes swaywm/sway#2748
This commit is contained in:
emersion 2018-10-05 16:14:22 +02:00
parent 4e89a21397
commit ba91422747
4 changed files with 63 additions and 3 deletions
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include/wlr/interfaces/wlr_output.h
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@ -33,6 +33,7 @@ struct wlr_output_impl {
size_t (*get_gamma_size)(struct wlr_output *output);
bool (*export_dmabuf)(struct wlr_output *output,
struct wlr_dmabuf_attributes *attribs);
void (*schedule_frame)(struct wlr_output *output);
};
void wlr_output_init(struct wlr_output *output, struct wlr_backend *backend,