From 0bb5e3953c71925a1bf4816783cf870d3efce622 Mon Sep 17 00:00:00 2001 From: Artur Mukhamadiev Date: Thu, 3 Jul 2025 20:45:20 +0000 Subject: [PATCH] XDG example --- .gitignore | 1 + client.c | 204 ++++++++++++++++++++++++++++++++++++++++++++++++++++ meson.build | 9 +++ 3 files changed, 214 insertions(+) create mode 100644 .gitignore create mode 100644 client.c create mode 100644 meson.build diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..378eac2 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +build diff --git a/client.c b/client.c new file mode 100644 index 0000000..0a89104 --- /dev/null +++ b/client.c @@ -0,0 +1,204 @@ +#define _POSIX_C_SOURCE 200112L +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "xdg-shell-client-protocol.h" + +/* Shared memory support code */ +static void +randname(char *buf) +{ + struct timespec ts; + clock_gettime(CLOCK_REALTIME, &ts); + long r = ts.tv_nsec; + for (int i = 0; i < 6; ++i) { + buf[i] = 'A'+(r&15)+(r&16)*2; + r >>= 5; + } +} + +static int +create_shm_file(void) +{ + int retries = 100; + do { + char name[] = "/wl_shm-XXXXXX"; + randname(name + sizeof(name) - 7); + --retries; + int fd = shm_open(name, O_RDWR | O_CREAT | O_EXCL, 0600); + if (fd >= 0) { + shm_unlink(name); + return fd; + } + } while (retries > 0 && errno == EEXIST); + return -1; +} + +static int +allocate_shm_file(size_t size) +{ + int fd = create_shm_file(); + if (fd < 0) + return -1; + int ret; + do { + ret = ftruncate(fd, size); + } while (ret < 0 && errno == EINTR); + if (ret < 0) { + close(fd); + return -1; + } + return fd; +} + +/* Wayland code */ +struct client_state { + /* Globals */ + struct wl_display *wl_display; + struct wl_registry *wl_registry; + struct wl_shm *wl_shm; + struct wl_compositor *wl_compositor; + struct xdg_wm_base *xdg_wm_base; + /* Objects */ + struct wl_surface *wl_surface; + struct xdg_surface *xdg_surface; + struct xdg_toplevel *xdg_toplevel; +}; + +static void +wl_buffer_release(void *data, struct wl_buffer *wl_buffer) +{ + /* Sent by the compositor when it's no longer using this buffer */ + wl_buffer_destroy(wl_buffer); +} + +static const struct wl_buffer_listener wl_buffer_listener = { + .release = wl_buffer_release, +}; + +static struct wl_buffer * +draw_frame(struct client_state *state) +{ + const int width = 640, height = 480; + int stride = width * 4; + int size = stride * height; + + int fd = allocate_shm_file(size); + if (fd == -1) { + return NULL; + } + + uint32_t *data = mmap(NULL, size, + PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + if (data == MAP_FAILED) { + close(fd); + return NULL; + } + + struct wl_shm_pool *pool = wl_shm_create_pool(state->wl_shm, fd, size); + struct wl_buffer *buffer = wl_shm_pool_create_buffer(pool, 0, + width, height, stride, WL_SHM_FORMAT_XRGB8888); + wl_shm_pool_destroy(pool); + close(fd); + + /* Draw checkerboxed background */ + for (int y = 0; y < height; ++y) { + for (int x = 0; x < width; ++x) { + if ((x + y / 8 * 8) % 16 < 8) + data[y * width + x] = 0xFF666666; + else + data[y * width + x] = 0xFFEEEEEE; + } + } + + munmap(data, size); + wl_buffer_add_listener(buffer, &wl_buffer_listener, NULL); + return buffer; +} + +static void +xdg_surface_configure(void *data, + struct xdg_surface *xdg_surface, uint32_t serial) +{ + struct client_state *state = data; + xdg_surface_ack_configure(xdg_surface, serial); + + struct wl_buffer *buffer = draw_frame(state); + wl_surface_attach(state->wl_surface, buffer, 0, 0); + wl_surface_commit(state->wl_surface); +} + +static const struct xdg_surface_listener xdg_surface_listener = { + .configure = xdg_surface_configure, +}; + +static void +xdg_wm_base_ping(void *data, struct xdg_wm_base *xdg_wm_base, uint32_t serial) +{ + xdg_wm_base_pong(xdg_wm_base, serial); +} + +static const struct xdg_wm_base_listener xdg_wm_base_listener = { + .ping = xdg_wm_base_ping, +}; + +static void +registry_global(void *data, struct wl_registry *wl_registry, + uint32_t name, const char *interface, uint32_t version) +{ + struct client_state *state = data; + if (strcmp(interface, wl_shm_interface.name) == 0) { + state->wl_shm = wl_registry_bind( + wl_registry, name, &wl_shm_interface, 1); + } else if (strcmp(interface, wl_compositor_interface.name) == 0) { + state->wl_compositor = wl_registry_bind( + wl_registry, name, &wl_compositor_interface, 4); + } else if (strcmp(interface, xdg_wm_base_interface.name) == 0) { + state->xdg_wm_base = wl_registry_bind( + wl_registry, name, &xdg_wm_base_interface, 1); + xdg_wm_base_add_listener(state->xdg_wm_base, + &xdg_wm_base_listener, state); + } +} + +static void +registry_global_remove(void *data, + struct wl_registry *wl_registry, uint32_t name) +{ + /* This space deliberately left blank */ +} + +static const struct wl_registry_listener wl_registry_listener = { + .global = registry_global, + .global_remove = registry_global_remove, +}; + +int +main(int argc, char *argv[]) +{ + struct client_state state = { 0 }; + state.wl_display = wl_display_connect(NULL); + state.wl_registry = wl_display_get_registry(state.wl_display); + wl_registry_add_listener(state.wl_registry, &wl_registry_listener, &state); + wl_display_roundtrip(state.wl_display); + + state.wl_surface = wl_compositor_create_surface(state.wl_compositor); + state.xdg_surface = xdg_wm_base_get_xdg_surface( + state.xdg_wm_base, state.wl_surface); + xdg_surface_add_listener(state.xdg_surface, &xdg_surface_listener, &state); + state.xdg_toplevel = xdg_surface_get_toplevel(state.xdg_surface); + xdg_toplevel_set_title(state.xdg_toplevel, "Example client"); + wl_surface_commit(state.wl_surface); + + while (wl_display_dispatch(state.wl_display)) { + /* This space deliberately left blank */ + } + + return 0; +} diff --git a/meson.build b/meson.build new file mode 100644 index 0000000..fbba614 --- /dev/null +++ b/meson.build @@ -0,0 +1,9 @@ +project('hello-wayland', 'c') + +wl_dep = dependency('wayland-client') +wl_mod = import('wayland') + +xml = wl_mod.find_protocol('xdg-shell') +xdg_shell = wl_mod.scan_xml(xml) + +executable('hw', 'client.c', xdg_shell, dependencies : wl_dep)