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Implement the set_acquire_fence request of the zwp_surface_synchronization_v1 interface. The implementation uses the acquire fence in two ways: 1. If the associated buffer is used as GL render source, an EGLSyncKHR is created from the fence and used to synchronize access. 2. If the associated buffer is used as a plane framebuffer, the acquire fence is treated as an in-fence for the atomic commit operation. If in-fences are not supported and the buffer has an acquire fence, we don't consider it for plane placement. If the used compositor/renderer doesn't support explicit synchronization, we don't advertise the protocol at all. Currently only the DRM and X11 backends when using the GL renderer advertise the protocol for production use. Issues for discussion --------------------- a. Currently, a server-side wait of EGLSyncKHR is performed before using the EGLImage/texture during rendering. Unfortunately, it's not clear...
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