wlroots 是一个快速构建 compositor 的库， 绝大多数的wm都是基于 wlroots 开发的， 如果需要一些比较底层的功能， 例如获取屏幕 buffer 来实现截屏或录屏， 你可以使用 wlroots 来加快你的开发过程， 简化你和 wayland 直接打交道。
通过 pkg-config 查询对应库名称, 因为wlroots用的meson, 没有提供CMake配置
CMakeLists.txt
cmake_minimum_required(VERSION 3.20)
set(CMAKE_EXPORT_COMPILE_COMMANDS true)
find_package(PkgConfig REQUIRED)
pkg_check_modules(WLROOTS REQUIRED wlroots-0.18)
pkg_check_modules(LIBDRM REQUIRED libdrm_amdgpu)
pkg_check_modules(XKBCOMMON REQUIRED xkbcommon)
pkg_check_modules(WAYLAND_SERVER REQUIRED wayland-server)
pkg_check_modules(WAYLAND_COMPOSITOR REQUIRED clutter-wayland-compositor-1.0)
project(simplewlr)
add_definitions(-DWLR_USE_UNSTABLE)
add_executable(simplewlr)
target_sources(simplewlr PRIVATE src/main.c)
target_include_directories(simplewlr PRIVATE ${WLROOTS_INCLUDE_DIRS}
${LIBDRM_INCLUDE_DIRS})
target_link_libraries(
simplewlr PRIVATE ${WLROOTS_LIBRARIES} ${LIBDRM_LIBRARIES}
${WAYLAND_SERVER_LIBRARIES} ${XKBCOMMON_LIBRARIES})
sec/main.c 参考官方example的simple示例
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <wayland-server-core.h>
#include <wlr/backend.h>
#include <wlr/backend/session.h>
#include <wlr/render/allocator.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_input_device.h>
#include <wlr/types/wlr_keyboard.h>
#include <wlr/types/wlr_output.h>
#include <wlr/util/log.h>
#include <xkbcommon/xkbcommon.h>
struct sample_state {
struct wl_display *display;
struct wl_listener new_output;
struct wl_listener new_input;
struct wlr_renderer *renderer;
struct wlr_allocator *allocator;
struct timespec last_frame;
float color[4];
int dec;
};
struct sample_output {
struct sample_state *sample;
struct wlr_output *output;
struct wl_listener frame;
struct wl_listener destroy;
};
struct sample_keyboard {
struct sample_state *sample;
struct wlr_keyboard *wlr_keyboard;
struct wl_listener key;
struct wl_listener destroy;
};
static void output_frame_notify(struct wl_listener *listener, void *data) {
struct sample_output *sample_output =
wl_container_of(listener, sample_output, frame);
struct sample_state *sample = sample_output->sample;
struct wlr_output *wlr_output = sample_output->output;
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
long ms = (now.tv_sec - sample->last_frame.tv_sec) * 1000 +
(now.tv_nsec - sample->last_frame.tv_nsec) / 1000000;
int inc = (sample->dec + 1) % 3;
sample->color[inc] += ms / 2000.0f;
sample->color[sample->dec] -= ms / 2000.0f;
if (sample->color[sample->dec] < 0.0f) {
sample->color[inc] = 1.0f;
sample->color[sample->dec] = 0.0f;
sample->dec = inc;
}
struct wlr_output_state state;
wlr_output_state_init(&state);
struct wlr_render_pass *pass =
wlr_output_begin_render_pass(wlr_output, &state, NULL, NULL);
wlr_render_pass_add_rect(pass, &(struct wlr_render_rect_options){
.box = {.width = wlr_output->width,
.height = wlr_output->height},
.color =
{
.r = sample->color[0],
.g = sample->color[1],
.b = sample->color[2],
.a = sample->color[3],
},
});
wlr_render_pass_submit(pass);
wlr_output_commit_state(wlr_output, &state);
wlr_output_state_finish(&state);
sample->last_frame = now;
}
static void output_remove_notify(struct wl_listener *listener, void *data) {
struct sample_output *sample_output =
wl_container_of(listener, sample_output, destroy);
wlr_log(WLR_DEBUG, "Output removed");
wl_list_remove(&sample_output->frame.link);
wl_list_remove(&sample_output->destroy.link);
free(sample_output);
}
static void new_output_notify(struct wl_listener *listener, void *data) {
struct wlr_output *output = data;
struct sample_state *sample = wl_container_of(listener, sample, new_output);
wlr_output_init_render(output, sample->allocator, sample->renderer);
struct sample_output *sample_output = calloc(1, sizeof(*sample_output));
sample_output->output = output;
sample_output->sample = sample;
wl_signal_add(&output->events.frame, &sample_output->frame);
sample_output->frame.notify = output_frame_notify;
wl_signal_add(&output->events.destroy, &sample_output->destroy);
sample_output->destroy.notify = output_remove_notify;
struct wlr_output_state state;
wlr_output_state_init(&state);
wlr_output_state_set_enabled(&state, true);
struct wlr_output_mode *mode = wlr_output_preferred_mode(output);
if (mode != NULL) {
wlr_output_state_set_mode(&state, mode);
}
wlr_output_commit_state(output, &state);
wlr_output_state_finish(&state);
}
static void keyboard_key_notify(struct wl_listener *listener, void *data) {
struct sample_keyboard *keyboard = wl_container_of(listener, keyboard, key);
struct sample_state *sample = keyboard->sample;
struct wlr_keyboard_key_event *event = data;
uint32_t keycode = event->keycode + 8;
const xkb_keysym_t *syms;
int nsyms =
xkb_state_key_get_syms(keyboard->wlr_keyboard->xkb_state, keycode, &syms);
for (int i = 0; i < nsyms; i++) {
xkb_keysym_t sym = syms[i];
if (sym == XKB_KEY_Escape) {
wl_display_terminate(sample->display);
}
}
}
static void keyboard_destroy_notify(struct wl_listener *listener, void *data) {
struct sample_keyboard *keyboard =
wl_container_of(listener, keyboard, destroy);
wl_list_remove(&keyboard->destroy.link);
wl_list_remove(&keyboard->key.link);
free(keyboard);
}
static void new_input_notify(struct wl_listener *listener, void *data) {
struct wlr_input_device *device = data;
struct sample_state *sample = wl_container_of(listener, sample, new_input);
switch (device->type) {
case WLR_INPUT_DEVICE_KEYBOARD:;
struct sample_keyboard *keyboard = calloc(1, sizeof(*keyboard));
keyboard->wlr_keyboard = wlr_keyboard_from_input_device(device);
keyboard->sample = sample;
wl_signal_add(&device->events.destroy, &keyboard->destroy);
keyboard->destroy.notify = keyboard_destroy_notify;
wl_signal_add(&keyboard->wlr_keyboard->events.key, &keyboard->key);
keyboard->key.notify = keyboard_key_notify;
struct xkb_context *context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
if (!context) {
wlr_log(WLR_ERROR, "Failed to create XKB context");
exit(1);
}
struct xkb_keymap *keymap =
xkb_keymap_new_from_names(context, NULL, XKB_KEYMAP_COMPILE_NO_FLAGS);
if (!keymap) {
wlr_log(WLR_ERROR, "Failed to create XKB keymap");
exit(1);
}
wlr_keyboard_set_keymap(keyboard->wlr_keyboard, keymap);
xkb_keymap_unref(keymap);
xkb_context_unref(context);
break;
default:
break;
}
}
int main(void) {
wlr_log_init(WLR_DEBUG, NULL);
struct wl_display *display = wl_display_create();
struct sample_state state = {.color = {1.0, 0.0, 0.0, 1.0},
.dec = 0,
.last_frame = {0},
.display = display};
struct wlr_backend *backend =
wlr_backend_autocreate(wl_display_get_event_loop(display), NULL);
if (!backend) {
exit(1);
}
state.renderer = wlr_renderer_autocreate(backend);
state.allocator = wlr_allocator_autocreate(backend, state.renderer);
wl_signal_add(&backend->events.new_output, &state.new_output);
state.new_output.notify = new_output_notify;
wl_signal_add(&backend->events.new_input, &state.new_input);
state.new_input.notify = new_input_notify;
clock_gettime(CLOCK_MONOTONIC, &state.last_frame);
if (!wlr_backend_start(backend)) {
wlr_log(WLR_ERROR, "Failed to start backend");
wlr_backend_destroy(backend);
exit(1);
}
wl_display_run(display);
wl_display_destroy(display);
}