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297 lines
8.1 KiB
297 lines
8.1 KiB
#define _POSIX_C_SOURCE 200809L
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#include <assert.h>
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#include <drm_fourcc.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <wlr/interfaces/wlr_input_device.h>
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#include <wlr/interfaces/wlr_output.h>
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#include <wlr/render/wlr_renderer.h>
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#include <wlr/util/log.h>
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#include <xf86drm.h>
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#include "backend/headless.h"
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#include "render/drm_format_set.h"
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#include "render/gbm_allocator.h"
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#include "render/wlr_renderer.h"
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#include "util/signal.h"
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struct wlr_headless_backend *headless_backend_from_backend(
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struct wlr_backend *wlr_backend) {
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assert(wlr_backend_is_headless(wlr_backend));
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return (struct wlr_headless_backend *)wlr_backend;
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}
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static bool backend_start(struct wlr_backend *wlr_backend) {
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struct wlr_headless_backend *backend =
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headless_backend_from_backend(wlr_backend);
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wlr_log(WLR_INFO, "Starting headless backend");
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struct wlr_headless_output *output;
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wl_list_for_each(output, &backend->outputs, link) {
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wl_event_source_timer_update(output->frame_timer, output->frame_delay);
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wlr_output_update_enabled(&output->wlr_output, true);
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wlr_signal_emit_safe(&backend->backend.events.new_output,
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&output->wlr_output);
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}
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struct wlr_headless_input_device *input_device;
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wl_list_for_each(input_device, &backend->input_devices,
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wlr_input_device.link) {
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wlr_signal_emit_safe(&backend->backend.events.new_input,
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&input_device->wlr_input_device);
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}
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backend->started = true;
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return true;
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}
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static void backend_destroy(struct wlr_backend *wlr_backend) {
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struct wlr_headless_backend *backend =
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headless_backend_from_backend(wlr_backend);
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if (!wlr_backend) {
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return;
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}
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wl_list_remove(&backend->display_destroy.link);
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wl_list_remove(&backend->renderer_destroy.link);
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struct wlr_headless_output *output, *output_tmp;
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wl_list_for_each_safe(output, output_tmp, &backend->outputs, link) {
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wlr_output_destroy(&output->wlr_output);
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}
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struct wlr_headless_input_device *input_device, *input_device_tmp;
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wl_list_for_each_safe(input_device, input_device_tmp,
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&backend->input_devices, wlr_input_device.link) {
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wlr_input_device_destroy(&input_device->wlr_input_device);
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}
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wlr_signal_emit_safe(&wlr_backend->events.destroy, backend);
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free(backend->format);
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if (!backend->has_parent_renderer) {
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wlr_renderer_destroy(backend->renderer);
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}
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wlr_allocator_destroy(backend->allocator);
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close(backend->drm_fd);
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free(backend);
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}
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static struct wlr_renderer *backend_get_renderer(
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struct wlr_backend *wlr_backend) {
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struct wlr_headless_backend *backend =
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headless_backend_from_backend(wlr_backend);
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return backend->renderer;
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}
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static int backend_get_drm_fd(struct wlr_backend *wlr_backend) {
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struct wlr_headless_backend *backend =
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headless_backend_from_backend(wlr_backend);
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return backend->drm_fd;
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}
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static const struct wlr_backend_impl backend_impl = {
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.start = backend_start,
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.destroy = backend_destroy,
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.get_renderer = backend_get_renderer,
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.get_drm_fd = backend_get_drm_fd,
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};
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static void handle_display_destroy(struct wl_listener *listener, void *data) {
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struct wlr_headless_backend *backend =
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wl_container_of(listener, backend, display_destroy);
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backend_destroy(&backend->backend);
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}
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static void handle_renderer_destroy(struct wl_listener *listener, void *data) {
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struct wlr_headless_backend *backend =
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wl_container_of(listener, backend, renderer_destroy);
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backend_destroy(&backend->backend);
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}
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static bool backend_init(struct wlr_headless_backend *backend,
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struct wl_display *display, struct wlr_allocator *allocator,
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struct wlr_renderer *renderer) {
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wlr_backend_init(&backend->backend, &backend_impl);
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backend->display = display;
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wl_list_init(&backend->outputs);
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wl_list_init(&backend->input_devices);
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backend->allocator = allocator;
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backend->renderer = renderer;
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const struct wlr_drm_format_set *formats =
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wlr_renderer_get_dmabuf_render_formats(backend->renderer);
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if (formats == NULL) {
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wlr_log(WLR_ERROR, "Failed to get available DMA-BUF formats from renderer");
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return false;
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}
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const struct wlr_drm_format *format =
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wlr_drm_format_set_get(formats, DRM_FORMAT_XRGB8888);
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if (format == NULL) {
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wlr_log(WLR_ERROR, "Renderer doesn't support XRGB8888");
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return false;
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}
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backend->format = wlr_drm_format_dup(format);
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backend->display_destroy.notify = handle_display_destroy;
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wl_display_add_destroy_listener(display, &backend->display_destroy);
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wl_list_init(&backend->renderer_destroy.link);
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return true;
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}
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static int open_drm_render_node(void) {
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uint32_t flags = 0;
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int devices_len = drmGetDevices2(flags, NULL, 0);
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if (devices_len < 0) {
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wlr_log(WLR_ERROR, "drmGetDevices2 failed");
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return -1;
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}
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drmDevice **devices = calloc(devices_len, sizeof(drmDevice *));
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if (devices == NULL) {
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wlr_log_errno(WLR_ERROR, "Allocation failed");
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return -1;
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}
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devices_len = drmGetDevices2(flags, devices, devices_len);
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if (devices_len < 0) {
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free(devices);
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wlr_log(WLR_ERROR, "drmGetDevices2 failed");
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return -1;
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}
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int fd = -1;
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for (int i = 0; i < devices_len; i++) {
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drmDevice *dev = devices[i];
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if (dev->available_nodes & (1 << DRM_NODE_RENDER)) {
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const char *name = dev->nodes[DRM_NODE_RENDER];
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wlr_log(WLR_DEBUG, "Opening DRM render node '%s'", name);
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fd = open(name, O_RDWR | O_CLOEXEC);
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if (fd < 0) {
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wlr_log_errno(WLR_ERROR, "Failed to open '%s'", name);
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goto out;
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}
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break;
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}
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}
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if (fd < 0) {
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wlr_log(WLR_ERROR, "Failed to find any DRM render node");
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}
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out:
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for (int i = 0; i < devices_len; i++) {
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drmFreeDevice(&devices[i]);
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}
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free(devices);
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return fd;
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}
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struct wlr_backend *wlr_headless_backend_create(struct wl_display *display) {
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wlr_log(WLR_INFO, "Creating headless backend");
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struct wlr_headless_backend *backend =
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calloc(1, sizeof(struct wlr_headless_backend));
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if (!backend) {
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wlr_log(WLR_ERROR, "Failed to allocate wlr_headless_backend");
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return NULL;
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}
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backend->drm_fd = open_drm_render_node();
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if (backend->drm_fd < 0) {
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wlr_log(WLR_ERROR, "Failed to open DRM render node");
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goto error_drm_fd;
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}
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int drm_fd = fcntl(backend->drm_fd, F_DUPFD_CLOEXEC, 0);
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if (drm_fd < 0) {
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wlr_log_errno(WLR_ERROR, "fcntl(F_DUPFD_CLOEXEC) failed");
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goto error_dup;
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}
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struct wlr_gbm_allocator *gbm_alloc = wlr_gbm_allocator_create(drm_fd);
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if (gbm_alloc == NULL) {
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wlr_log(WLR_ERROR, "Failed to create GBM allocator");
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close(drm_fd);
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goto error_dup;
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}
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struct wlr_renderer *renderer = wlr_renderer_autocreate(&backend->backend);
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if (!renderer) {
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wlr_log(WLR_ERROR, "Failed to create renderer");
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goto error_renderer;
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}
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if (!backend_init(backend, display, &gbm_alloc->base, renderer)) {
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goto error_init;
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}
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return &backend->backend;
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error_init:
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wlr_renderer_destroy(renderer);
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error_renderer:
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wlr_allocator_destroy(&gbm_alloc->base);
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error_dup:
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close(backend->drm_fd);
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error_drm_fd:
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free(backend);
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return NULL;
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}
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struct wlr_backend *wlr_headless_backend_create_with_renderer(
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struct wl_display *display, struct wlr_renderer *renderer) {
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wlr_log(WLR_INFO, "Creating headless backend with parent renderer");
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struct wlr_headless_backend *backend =
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calloc(1, sizeof(struct wlr_headless_backend));
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if (!backend) {
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wlr_log(WLR_ERROR, "Failed to allocate wlr_headless_backend");
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return NULL;
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}
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backend->has_parent_renderer = true;
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backend->drm_fd = wlr_renderer_get_drm_fd(renderer);
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if (backend->drm_fd < 0) {
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wlr_log(WLR_ERROR, "Failed to get DRM device FD from renderer");
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goto error_drm_fd;
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}
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int drm_fd = fcntl(backend->drm_fd, F_DUPFD_CLOEXEC, 0);
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if (drm_fd < 0) {
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wlr_log_errno(WLR_ERROR, "fcntl(F_DUPFD_CLOEXEC) failed");
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goto error_dup;
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}
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struct wlr_gbm_allocator *gbm_alloc = wlr_gbm_allocator_create(drm_fd);
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if (gbm_alloc == NULL) {
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wlr_log(WLR_ERROR, "Failed to create GBM allocator");
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close(drm_fd);
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goto error_dup;
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}
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if (!backend_init(backend, display, &gbm_alloc->base, renderer)) {
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goto error_init;
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}
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backend->renderer_destroy.notify = handle_renderer_destroy;
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wl_signal_add(&renderer->events.destroy, &backend->renderer_destroy);
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return &backend->backend;
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error_init:
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wlr_allocator_destroy(&gbm_alloc->base);
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error_dup:
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close(backend->drm_fd);
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error_drm_fd:
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free(backend);
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return NULL;
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}
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bool wlr_backend_is_headless(struct wlr_backend *backend) {
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return backend->impl == &backend_impl;
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}
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