diff options
Diffstat (limited to 'src/main.c')
| -rw-r--r-- | src/main.c | 398 |
1 files changed, 398 insertions, 0 deletions
diff --git a/src/main.c b/src/main.c new file mode 100644 index 0000000..5991424 --- /dev/null +++ b/src/main.c @@ -0,0 +1,398 @@ +#include <assert.h> +#include <epoxy/egl.h> +#include <epoxy/gl.h> +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <stdbool.h> +#include <stdio.h> +#include <string.h> +#include <sys/mman.h> +#include <time.h> +#include <unistd.h> +#include <wayland-client.h> +#include <wayland-egl.h> +#include <xkbcommon/xkbcommon.h> +#include "client.h" +#include "egl.h" +#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 */ + +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 = state->width, height = state->height; + 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 */ + int offset = (int)state->offset % 8; + for (int y = 0; y < height; ++y) { + for (int x = 0; x < width; ++x) { + if (((x + offset) + (y + offset) / 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_toplevel_configure(void *data, + struct xdg_toplevel *xdg_toplevel, int32_t width, int32_t height, + struct wl_array *states) +{ + struct client_state *state = data; + if (width == 0 || height == 0) { + /* Compositor is deferring to us */ + return; + } + state->width = width; + state->height = height; +} + +static void +xdg_toplevel_close(void *data, struct xdg_toplevel *toplevel) +{ + struct client_state *state = data; + state->closed = true; +} + +static const struct xdg_toplevel_listener xdg_toplevel_listener = { + .configure = xdg_toplevel_configure, + .close = xdg_toplevel_close +}; + +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 +wl_keyboard_keymap(void *data, struct wl_keyboard *wl_keyboard, + uint32_t format, int32_t fd, uint32_t size) +{ + struct client_state *client_state = data; + assert(format == WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1); + + char *map_shm = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0); + assert(map_shm != MAP_FAILED); + + struct xkb_keymap *xkb_keymap = xkb_keymap_new_from_string( + client_state->xkb_context, map_shm, + XKB_KEYMAP_FORMAT_TEXT_V1, XKB_KEYMAP_COMPILE_NO_FLAGS); + munmap(map_shm, size); + close(fd); + + struct xkb_state *xkb_state = xkb_state_new(xkb_keymap); + xkb_keymap_unref(client_state->xkb_keymap); + xkb_state_unref(client_state->xkb_state); + client_state->xkb_keymap = xkb_keymap; + client_state->xkb_state = xkb_state; +} + +static void +wl_keyboard_enter(void *data, struct wl_keyboard *wl_keyboard, + uint32_t serial, struct wl_surface *surface, + struct wl_array *keys) +{ + struct client_state *client_state = data; + fprintf(stderr, "keyboard enter; keys pressed are:\n"); + uint32_t *key; + wl_array_for_each(key, keys) { + char buf[128]; + xkb_keysym_t sym = xkb_state_key_get_one_sym( + client_state->xkb_state, *key + 8); + xkb_keysym_get_name(sym, buf, sizeof(buf)); + fprintf(stderr, "sym: %-12s (%d), ", buf, sym); + xkb_state_key_get_utf8(client_state->xkb_state, + *key + 8, buf, sizeof(buf)); + fprintf(stderr, "utf8: '%s'\n", buf); + } +} + +static void +wl_keyboard_key(void *data, struct wl_keyboard *wl_keyboard, + uint32_t serial, uint32_t time, uint32_t key, uint32_t state) +{ + struct client_state *client_state = data; + char buf[128]; + uint32_t keycode = key + 8; + xkb_keysym_t sym = xkb_state_key_get_one_sym( + client_state->xkb_state, keycode); + xkb_keysym_get_name(sym, buf, sizeof(buf)); + const char *action = + state == WL_KEYBOARD_KEY_STATE_PRESSED ? "press" : "release"; + fprintf(stderr, "key %s: sym: %-12s (%d), ", action, buf, sym); + xkb_state_key_get_utf8(client_state->xkb_state, keycode, + buf, sizeof(buf)); + fprintf(stderr, "utf8: '%s'\n", buf); +} + +static void +wl_keyboard_leave(void *data, struct wl_keyboard *wl_keyboard, + uint32_t serial, struct wl_surface *surface) +{ + fprintf(stderr, "keyboard leave\n"); +} + +static void +wl_keyboard_modifiers(void *data, struct wl_keyboard *wl_keyboard, + uint32_t serial, uint32_t mods_depressed, + uint32_t mods_latched, uint32_t mods_locked, + uint32_t group) +{ + struct client_state *client_state = data; + xkb_state_update_mask(client_state->xkb_state, + mods_depressed, mods_latched, mods_locked, 0, 0, group); +} + +static void +wl_keyboard_repeat_info(void *data, struct wl_keyboard *wl_keyboard, + int32_t rate, int32_t delay) +{ + /* Left as an exercise for the reader */ +} + +static const struct wl_keyboard_listener wl_keyboard_listener = { + .keymap = wl_keyboard_keymap, + .enter = wl_keyboard_enter, + .leave = wl_keyboard_leave, + .key = wl_keyboard_key, + .modifiers = wl_keyboard_modifiers, + .repeat_info = wl_keyboard_repeat_info, +}; + +static void +wl_seat_capabilities(void *data, struct wl_seat *wl_seat, uint32_t capabilities) +{ + struct client_state *state = data; + + bool have_keyboard = capabilities & WL_SEAT_CAPABILITY_KEYBOARD; + + if (have_keyboard && state->wl_keyboard == NULL) { + state->wl_keyboard = wl_seat_get_keyboard(state->wl_seat); + wl_keyboard_add_listener(state->wl_keyboard, + &wl_keyboard_listener, state); + } else if (!have_keyboard && state->wl_keyboard != NULL) { + wl_keyboard_release(state->wl_keyboard); + state->wl_keyboard = NULL; + } +} + +static void +wl_seat_name(void *data, struct wl_seat *wl_seat, const char *name) +{ + fprintf(stderr, "seat name: %s\n", name); +} + +static const struct wl_seat_listener wl_seat_listener = { + .capabilities = wl_seat_capabilities, + .name = wl_seat_name, +}; + +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 const struct wl_callback_listener wl_surface_frame_listener; + +static void +wl_surface_frame_done(void *data, struct wl_callback *cb, uint32_t time) +{ + /* Destroy this callback */ + wl_callback_destroy(cb); + + /* Request another frame */ + struct client_state *state = data; + cb = wl_surface_frame(state->wl_surface); + wl_callback_add_listener(cb, &wl_surface_frame_listener, state); + + /* Update scroll amount at 24 pixels per second */ + if (state->last_frame != 0) { + int elapsed = time - state->last_frame; + state->offset += elapsed / 1000.0 * 24; + } + + /* Submit a frame for this event */ + struct wl_buffer *buffer = draw_frame(state); + wl_surface_attach(state->wl_surface, buffer, 0, 0); + wl_surface_damage_buffer(state->wl_surface, 0, 0, INT32_MAX, INT32_MAX); + wl_surface_commit(state->wl_surface); + + state->last_frame = time; +} + +static const struct wl_callback_listener wl_surface_frame_listener = { + .done = wl_surface_frame_done, +}; + +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, wl_seat_interface.name) == 0) { + state->wl_seat = wl_registry_bind( + wl_registry, name, &wl_seat_interface, 7); + wl_seat_add_listener(state->wl_seat, + &wl_seat_listener, state); + } 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.width = 640; + state.height = 480; + state.wl_display = wl_display_connect(NULL); + state.wl_registry = wl_display_get_registry(state.wl_display); + state.xkb_context = xkb_context_new(XKB_CONTEXT_NO_FLAGS); + 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_add_listener(state.xdg_toplevel, + &xdg_toplevel_listener, &state); + xdg_toplevel_set_title(state.xdg_toplevel, "Example client"); + + wl_surface_commit(state.wl_surface); + + egl_create_window(&state); + egl_create_context(&state); + + struct wl_callback *cb = wl_surface_frame(state.wl_surface); + wl_callback_add_listener(cb, &wl_surface_frame_listener, &state); + + while (!state.closed) { + wl_display_dispatch(state.wl_display); + } + + return 0; +} |