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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <drm_fourcc.h>
#include <stdlib.h>
#include <unistd.h>
#include <wlr/interfaces/wlr_input_device.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/render/egl.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/render/gles2.h>
#include <wlr/util/log.h>
#include <xf86drm.h>
#include "backend/headless.h"
#include "render/drm_format_set.h"
#include "render/gbm_allocator.h"
#include "render/wlr_renderer.h"
#include "util/signal.h"
struct wlr_headless_backend *headless_backend_from_backend(
struct wlr_backend *wlr_backend) {
assert(wlr_backend_is_headless(wlr_backend));
return (struct wlr_headless_backend *)wlr_backend;
}
static bool backend_start(struct wlr_backend *wlr_backend) {
struct wlr_headless_backend *backend =
headless_backend_from_backend(wlr_backend);
wlr_log(WLR_INFO, "Starting headless backend");
struct wlr_headless_output *output;
wl_list_for_each(output, &backend->outputs, link) {
wl_event_source_timer_update(output->frame_timer, output->frame_delay);
wlr_output_update_enabled(&output->wlr_output, true);
wlr_signal_emit_safe(&backend->backend.events.new_output,
&output->wlr_output);
}
struct wlr_headless_input_device *input_device;
wl_list_for_each(input_device, &backend->input_devices,
wlr_input_device.link) {
wlr_signal_emit_safe(&backend->backend.events.new_input,
&input_device->wlr_input_device);
}
backend->started = true;
return true;
}
static void backend_destroy(struct wlr_backend *wlr_backend) {
struct wlr_headless_backend *backend =
headless_backend_from_backend(wlr_backend);
if (!wlr_backend) {
return;
}
wl_list_remove(&backend->display_destroy.link);
wl_list_remove(&backend->renderer_destroy.link);
struct wlr_headless_output *output, *output_tmp;
wl_list_for_each_safe(output, output_tmp, &backend->outputs, link) {
wlr_output_destroy(&output->wlr_output);
}
struct wlr_headless_input_device *input_device, *input_device_tmp;
wl_list_for_each_safe(input_device, input_device_tmp,
&backend->input_devices, wlr_input_device.link) {
wlr_input_device_destroy(&input_device->wlr_input_device);
}
wlr_signal_emit_safe(&wlr_backend->events.destroy, backend);
free(backend->format);
wlr_allocator_destroy(backend->allocator);
if (backend->egl == &backend->priv_egl) {
wlr_renderer_destroy(backend->renderer);
wlr_egl_finish(&backend->priv_egl);
}
free(backend);
}
static struct wlr_renderer *backend_get_renderer(
struct wlr_backend *wlr_backend) {
struct wlr_headless_backend *backend =
headless_backend_from_backend(wlr_backend);
return backend->renderer;
}
static const struct wlr_backend_impl backend_impl = {
.start = backend_start,
.destroy = backend_destroy,
.get_renderer = backend_get_renderer,
};
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_headless_backend *backend =
wl_container_of(listener, backend, display_destroy);
backend_destroy(&backend->backend);
}
static void handle_renderer_destroy(struct wl_listener *listener, void *data) {
struct wlr_headless_backend *backend =
wl_container_of(listener, backend, renderer_destroy);
backend_destroy(&backend->backend);
}
static bool backend_init(struct wlr_headless_backend *backend,
struct wl_display *display, struct wlr_renderer *renderer) {
wlr_backend_init(&backend->backend, &backend_impl);
backend->display = display;
wl_list_init(&backend->outputs);
wl_list_init(&backend->input_devices);
backend->renderer = renderer;
backend->egl = wlr_gles2_renderer_get_egl(renderer);
int fd = wlr_renderer_get_drm_fd(renderer);
if (fd < 0) {
wlr_log(WLR_ERROR, "Failed to get DRM device FD from renderer");
return false;
}
fd = dup(fd);
if (fd < 0) {
wlr_log_errno(WLR_ERROR, "dup failed");
return false;
}
struct wlr_gbm_allocator *alloc = wlr_gbm_allocator_create(fd);
if (alloc == NULL) {
wlr_log(WLR_ERROR, "Failed to create GBM allocator");
return false;
}
backend->allocator = &alloc->base;
const struct wlr_drm_format_set *formats =
wlr_renderer_get_dmabuf_render_formats(backend->renderer);
if (formats == NULL) {
wlr_log(WLR_ERROR, "Failed to get available DMA-BUF formats from renderer");
return false;
}
const struct wlr_drm_format *format =
wlr_drm_format_set_get(formats, DRM_FORMAT_XRGB8888);
if (format == NULL) {
wlr_log(WLR_ERROR, "Renderer doesn't support XRGB8888");
return false;
}
backend->format = wlr_drm_format_dup(format);
backend->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &backend->display_destroy);
wl_list_init(&backend->renderer_destroy.link);
return true;
}
struct wlr_backend *wlr_headless_backend_create(struct wl_display *display,
wlr_renderer_create_func_t create_renderer_func) {
wlr_log(WLR_INFO, "Creating headless backend");
struct wlr_headless_backend *backend =
calloc(1, sizeof(struct wlr_headless_backend));
if (!backend) {
wlr_log(WLR_ERROR, "Failed to allocate wlr_headless_backend");
return NULL;
}
if (!create_renderer_func) {
create_renderer_func = wlr_renderer_autocreate;
}
struct wlr_renderer *renderer = create_renderer_func(&backend->priv_egl,
EGL_PLATFORM_SURFACELESS_MESA, EGL_DEFAULT_DISPLAY, NULL, 0);
if (!renderer) {
wlr_log(WLR_ERROR, "Failed to create renderer");
free(backend);
return NULL;
}
if (!backend_init(backend, display, renderer)) {
wlr_renderer_destroy(backend->renderer);
free(backend);
return NULL;
}
return &backend->backend;
}
struct wlr_backend *wlr_headless_backend_create_with_renderer(
struct wl_display *display, struct wlr_renderer *renderer) {
wlr_log(WLR_INFO, "Creating headless backend");
struct wlr_headless_backend *backend =
calloc(1, sizeof(struct wlr_headless_backend));
if (!backend) {
wlr_log(WLR_ERROR, "Failed to allocate wlr_headless_backend");
return NULL;
}
if (!backend_init(backend, display, renderer)) {
free(backend);
return NULL;
}
backend->renderer_destroy.notify = handle_renderer_destroy;
wl_signal_add(&renderer->events.destroy, &backend->renderer_destroy);
return &backend->backend;
}
bool wlr_backend_is_headless(struct wlr_backend *backend) {
return backend->impl == &backend_impl;
}
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