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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
61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
#ifndef BACKEND_DRM_RENDERER_H
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#define BACKEND_DRM_RENDERER_H
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#include <stdbool.h>
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#include <stdint.h>
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#include <wlr/backend.h>
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#include <wlr/render/wlr_renderer.h>
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struct wlr_drm_backend;
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struct wlr_drm_plane;
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struct wlr_buffer;
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struct wlr_drm_renderer {
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struct wlr_drm_backend *backend;
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struct wlr_renderer *wlr_rend;
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struct wlr_allocator *allocator;
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};
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struct wlr_drm_surface {
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struct wlr_drm_renderer *renderer;
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uint32_t width;
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uint32_t height;
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struct wlr_swapchain *swapchain;
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};
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struct wlr_drm_fb {
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struct wlr_buffer *wlr_buf;
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struct wlr_addon addon;
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struct wlr_drm_backend *backend;
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struct wl_list link; // wlr_drm_backend.fbs
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uint32_t handles[WLR_DMABUF_MAX_PLANES];
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uint32_t id;
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};
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bool init_drm_renderer(struct wlr_drm_backend *drm,
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struct wlr_drm_renderer *renderer);
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void finish_drm_renderer(struct wlr_drm_renderer *renderer);
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bool init_drm_surface(struct wlr_drm_surface *surf,
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struct wlr_drm_renderer *renderer, uint32_t width, uint32_t height,
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const struct wlr_drm_format *drm_format);
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bool drm_fb_import(struct wlr_drm_fb **fb, struct wlr_drm_backend *drm,
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struct wlr_buffer *buf, const struct wlr_drm_format_set *formats);
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void drm_fb_destroy(struct wlr_drm_fb *fb);
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void drm_fb_clear(struct wlr_drm_fb **fb);
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void drm_fb_move(struct wlr_drm_fb **new, struct wlr_drm_fb **old);
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struct wlr_buffer *drm_surface_blit(struct wlr_drm_surface *surf,
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struct wlr_buffer *buffer);
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struct wlr_drm_format *drm_plane_pick_render_format(
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struct wlr_drm_plane *plane, struct wlr_drm_renderer *renderer);
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void drm_plane_finish_surface(struct wlr_drm_plane *plane);
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#endif
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