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![Alexandros Frantzis](/assets/img/avatar_default.png)
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 from the specs whether this is generally safe to do, or we need to sync before glEGLImageTargetTexture2DOES. The exception is TEXTURE_EXTERNAL_OES where the spec mentions it's enough to sync and then glBindTexture for any changes to take effect. Changes in v5: - Meson support. - Make explicit sync server error reporting more generic, supporting all explicit sync related interfaces not just wp_linux_surface_synchronization. - Fix typo in warning for missing EGL_KHR_wait_sync extension. - Support minor version 2 of the explicit sync protocol (i.e., support fences for opaque EGL buffers). Changes in v4: - Introduce and use fd_clear and and fd_move helpers. - Don't check for a valid buffer when updating surface acquire fence fd from state. - Assert that pending state acquire fence fd is always clear after a commit. - Clarify that WESTON_CAP_EXPLICIT_SYNC applies to just the renderer. - Check for EGL_KHR_wait_sync before using eglWaitSyncKHR. - Dup the acquire fence before passing to EGL. Changes in v3: - Keep acquire_fence_fd in surface instead of buffer. - Clarify that WESTON_CAP_EXPLICIT_SYNC applies to both backend and renderer. - Move comment about non-ownership of in_fence_fd to struct drm_plane_state definition. - Assert that we don't try to use planes with in-fences when using the legacy KMS API. - Remove unnecessary info from wayland error messages. - Handle acquire fence for subsurface commits. - Guard against self-update in fd_update. - Disconnect the client if acquire fence EGLSyncKHR creation or wait fails. - Use updated protocol interface names. - User correct format specifier for resource ids. - Advertise protocol for X11 backend with GL renderer. Changes in v2: - Remove sync file wait fallbacks. - Raise UNSUPPORTED_BUFFER error at commit if we have an acquire fence, but the committed buffer is not a valid linux_dmabuf. - Don't put buffers with in-fences on planes that don't support in-fences. - Don't advertise explicit sync protocol if backend does not support explicit sync. Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/*
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* Copyright © 2018 Collabora, Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef FD_UTIL_H
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#define FD_UTIL_H
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#include <unistd.h>
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static inline void
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fd_update(int *fd, int new_fd)
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{
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if (*fd == new_fd)
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return;
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if (*fd >= 0)
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close(*fd);
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*fd = new_fd;
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}
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static inline void
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fd_move(int *dest, int *src)
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{
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if (dest == src)
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return;
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fd_update(dest, *src);
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*src = -1;
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}
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static inline void
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fd_clear(int *fd)
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{
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fd_update(fd, -1);
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}
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#endif /* FD_UTIL_H */
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