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render: introduce WLR_RENDER_DRM_DEVICE
This env var allows to override the DRM node used by the GLES2 and Vulkan renderers. It's especially useful to select a DRM node when running with the headless backend. References: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/2656
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2 changed files with 28 additions and 3 deletions
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@ -10,6 +10,8 @@ wlroots reads these environment variables
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of following shell search semantics for "Xwayland")
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* *WLR_RENDERER*: forces the creation of a specified renderer (available
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renderers: gles2, pixman, vulkan)
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* *WLR_RENDER_DRM_DEVICE*: specifies the DRM node to use for
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hardware-accelerated renderers.
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## DRM backend
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@ -348,18 +348,41 @@ out:
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}
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struct wlr_renderer *wlr_renderer_autocreate(struct wlr_backend *backend) {
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// Note, drm_fd may be negative if unavailable
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int drm_fd = wlr_backend_get_drm_fd(backend);
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int drm_fd = -1;
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int render_drm_fd = -1;
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// Allow the user to override the render node
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const char *render_name = getenv("WLR_RENDER_DRM_DEVICE");
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if (render_name != NULL) {
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wlr_log(WLR_INFO,
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"Opening DRM render node '%s' from WLR_RENDER_DRM_DEVICE",
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render_name);
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render_drm_fd = open(render_name, O_RDWR | O_CLOEXEC);
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if (render_drm_fd < 0) {
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wlr_log_errno(WLR_ERROR, "Failed to open '%s'", render_name);
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return NULL;
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}
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if (drmGetNodeTypeFromFd(render_drm_fd) != DRM_NODE_RENDER) {
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wlr_log(WLR_ERROR, "'%s' is not a DRM render node", render_name);
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close(render_drm_fd);
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return NULL;
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}
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drm_fd = render_drm_fd;
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}
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if (drm_fd < 0) {
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drm_fd = wlr_backend_get_drm_fd(backend);
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}
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// If the backend hasn't picked a DRM FD, but accepts DMA-BUFs, pick an
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// arbitrary render node
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int render_drm_fd = -1;
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uint32_t backend_caps = backend_get_buffer_caps(backend);
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if (drm_fd < 0 && (backend_caps & WLR_BUFFER_CAP_DMABUF) != 0) {
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render_drm_fd = open_drm_render_node();
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drm_fd = render_drm_fd;
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}
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// Note, drm_fd may be negative if unavailable
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struct wlr_renderer *renderer = renderer_autocreate_with_drm_fd(drm_fd);
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if (render_drm_fd >= 0) {
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