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On multi-GPU setups, multiple devices can be used for rendering. Clients need feedback about the device in use by the compositor. For instance, if they render on another GPU, then they need to make sure the memory is accessible between devices and that their buffers are not placed in hidden memory. This commit introduces a new wp_linux_dmabuf_feedback object. This object advertises a preferred main device, a set of preferred formats/modifiers and target devices. Each object is bound to a wl_surface and can dynamically update its feedback parameters. This enables fine-grained per-surface optimizations. For instance, when a surface is scanned out on a GPU the compositor isn't compositing with, the target device can be set to this GPU to avoid unnecessary roundtrips. A feedback object can also be standalone for clients that don't support per-surface feedback. Signed-off-by: Simon Ser <contact@emersion.fr> Signed-off-by: Leandro Ribeiro <leandro.ribeiro@collabora.com> Reviewed-by: Daniel Stone <daniels@collabora.com> Closes: https://gitlab.freedesktop.org/wayland/wayland/issues/59 |
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| feedback.rst | ||
| linux-dmabuf-unstable-v1.xml | ||
| README | ||
Linux DMA-BUF protocol Maintainers: Pekka Paalanen <pekka.paalanen@collabora.co.uk> Daniel Stone <daniels@collabora.com>