參考資訊:
https://jan.newmarch.name/Wayland/index.html
https://wayland.freedesktop.org/docs/html/apa.html
https://bugaevc.gitbooks.io/writing-wayland-clients/content/
main.c
#include <stdint.h> #include <stdio.h> #include <string.h> #include <sys/mman.h> #include <syscall.h> #include <unistd.h> #include <wayland-client.h> #define WIDTH 640 #define HEIGHT 480 #define STRIDE (WIDTH * 2) #define SIZE (STRIDE * HEIGHT) struct wl_shm *shm = NULL; struct wl_buffer *buf = NULL; struct wl_shell *shell = NULL; struct wl_display *dis = NULL; struct wl_surface *surf = NULL; struct wl_registry *reg = NULL; struct wl_shm_pool *pool = NULL; struct wl_compositor *comp = NULL; struct wl_shell_surface *shell_surf = NULL; void cb_handle(void *dat, struct wl_registry *reg, uint32_t id, const char *intf, uint32_t ver) { if (strcmp(intf, "wl_compositor") == 0) { comp = wl_registry_bind(reg, id, &wl_compositor_interface, 3); } else if (strcmp(intf, "wl_shm") == 0) { shm = wl_registry_bind(reg, id, &wl_shm_interface, 1); } else if (strcmp(intf, "wl_shell") == 0) { shell = wl_registry_bind(reg, id, &wl_shell_interface, 1); } } void cb_remove(void *dat, struct wl_registry *reg, uint32_t id) { } struct wl_registry_listener cb = { .global = cb_handle, .global_remove = cb_remove }; int main(int argc, char **argv) { dis = wl_display_connect(NULL); reg = wl_display_get_registry(dis); wl_registry_add_listener(reg, &cb, NULL); wl_display_dispatch(dis); wl_display_roundtrip(dis); surf = wl_compositor_create_surface(comp); shell_surf = wl_shell_get_shell_surface(shell, surf); wl_shell_surface_set_toplevel(shell_surf); int fd = syscall(SYS_memfd_create, "main", 0); ftruncate(fd, SIZE); uint16_t *addr = mmap(NULL, SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); pool = wl_shm_create_pool(shm, fd, SIZE); buf = wl_shm_pool_create_buffer(pool, 0, WIDTH, HEIGHT, STRIDE, WL_SHM_FORMAT_RGB565); wl_shm_pool_destroy(pool); printf("pool = 0x%08x\n", pool); printf("buf = 0x%08x\n", buf); printf("mmap = 0x%08x\n", addr); wl_surface_attach(surf, buf, 0, 0); wl_surface_commit(surf); wl_display_dispatch(dis); wl_display_roundtrip(dis); wl_shell_surface_destroy(shell_surf); wl_shell_destroy(shell); wl_surface_destroy(surf); wl_buffer_destroy(buf); wl_shm_destroy(shm); wl_compositor_destroy(comp); wl_registry_destroy(reg); wl_display_disconnect(dis); munmap(addr, SIZE); return 0; }
編譯、執行
$ gcc main.c -o main -lwayland-client $ ./main pool = 0x1f1eeac0 buf = 0x1f1eebd0 mmap = 0xbeb7f000