hello-wayland

>Does Wayland even have a mechanism to allow the compositor to tell the application that it is time to draw another frame? Yes, Wayland will tell you when it's time for another frame. >If I give the compositor a bitmap every 60th of a second, to I get any guarantee it will display it at the right time? Basically you should wait for the compositor to tell you when it's time to draw the next frame, diff it from the time you drew the last frame, and smoothly animate over the difference. If you don't want to draw on the GPU, what you can do is allocate a pixel buffer with wl_shm (shared memory). Then the compositor will read from this and presumably upload it to the GPU (with wlroots the GPU is always used, but you can probably convince it to use blitting instead with a custom renderer). Check out my intro to writing Wayland clients article: