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https://github.com/hyprwm/wlroots-hyprland.git
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5dfaf5ea9c
Using GBM to import DRM dumb buffers tends to not work well. By
using GBM we're calling some driver-specific functions in Mesa.
These functions check whether Mesa can work with the buffer.
Sometimes Mesa has requirements which differ from DRM dumb buffers
and the GBM import will fail (e.g. on amdgpu).
Instead, drop GBM and use drmPrimeFDToHandle directly. But there's
a twist: BO handles are not ref'counted by the kernel and need to
be ref'counted in user-space [1]. libdrm usually performs this
bookkeeping and is used under-the-hood by Mesa.
We can't re-use libdrm for this task without using driver-specific
APIs. So let's just re-implement the ref'counting logic in wlroots.
The wlroots implementation is inspired from amdgpu's in libdrm [2].
Closes: https://github.com/swaywm/wlroots/issues/2916
[1]: https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/110
[2]: 1a4c0ec9ae/amdgpu/handle_table.c
26 lines
696 B
C
26 lines
696 B
C
#ifndef BACKEND_DRM_IFACE_H
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#define BACKEND_DRM_IFACE_H
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#include <stdbool.h>
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#include <stdint.h>
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#include <xf86drm.h>
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#include <xf86drmMode.h>
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struct wlr_drm_backend;
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struct wlr_drm_connector;
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struct wlr_drm_crtc;
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// Used to provide atomic or legacy DRM functions
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struct wlr_drm_interface {
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// Commit all pending changes on a CRTC.
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bool (*crtc_commit)(struct wlr_drm_connector *conn,
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const struct wlr_output_state *state, uint32_t flags, bool test_only);
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};
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extern const struct wlr_drm_interface atomic_iface;
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extern const struct wlr_drm_interface legacy_iface;
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bool drm_legacy_crtc_set_gamma(struct wlr_drm_backend *drm,
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struct wlr_drm_crtc *crtc, size_t size, uint16_t *lut);
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#endif
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