Init

compositor.c

@@ -0,0 +1,180 @@
+#include "common/shm.h"
+#include "protocols/xdg-shell-client-protocol.h"
+
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <wayland/wayland-client.h>
+
+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 struct wl_buffer *draw_frame(struct client_state *state);
+
+static void registry_handle_global(void *data, struct wl_registry *registry, uint32_t name, const char *interface,
+                                   uint32_t version)
+{
+    struct client_state *state = data;
+
+    printf("interface: '%s', version: %d, name: %d\n", interface, version, name);
+
+    if (strcmp(interface, wl_compositor_interface.name) == 0) {
+        state->wl_compositor = wl_registry_bind(registry, name, &wl_compositor_interface, 5);
+        printf("Bound to compositor!\n");
+    }
+
+    if (strcmp(interface, wl_shm_interface.name) == 0) {
+        state->wl_shm = wl_registry_bind(registry, name, &wl_shm_interface, 1);
+        printf("Bound to shm!\n");
+    }
+
+    if (strcmp(interface, xdg_wm_base_interface.name) == 0) {
+        state->xdg_wm_base = wl_registry_bind(registry, name, &xdg_wm_base_interface, 4);
+        printf("Bound to wm_base!\n");
+    }
+}
+
+static void registry_handle_global_remove(void *data, struct wl_registry *registry, uint32_t name)
+{
+    // This space deliberately left blank
+}
+
+static void shm_handle_format(void *data, struct wl_shm *wl_shm, uint32_t format)
+{
+    struct client_state *state = data;
+
+    printf("shm_handle_format: supported format is [%d]\n", format);
+}
+
+static void wm_base_handle_ping(void *data, struct xdg_wm_base *xdg_wm_base, uint32_t serial)
+{
+    struct client_state *state = data;
+
+    // TODO !
+}
+
+static void surface_handle_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 wl_registry_listener wl_registry_listener = {
+    .global = registry_handle_global,
+    .global_remove = registry_handle_global_remove,
+};
+
+static const struct wl_shm_listener wl_shm_listener = {
+    .format = shm_handle_format,
+};
+
+static const struct xdg_wm_base_listener xdg_wm_base_listener = {
+    .ping = wm_base_handle_ping,
+};
+
+static const struct xdg_surface_listener xdg_surface_listener = {
+    .configure = surface_handle_configure,
+};
+
+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 offset = 0;
+
+    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);
+
+    // Solid white
+    // uint32_t *pixels = (uint32_t *)&data[offset];
+    // memset(pixels, 255, width * height * 4);
+
+    // Checkerboard pattern
+    uint32_t *pixels = (uint32_t *)&data[offset];
+    for (int y = 0; y < height; ++y) {
+        for (int x = 0; x < width; ++x) {
+            if ((x + y / 8 * 8) % 16 < 8) {
+                pixels[y * width + x] = 0xFF666666;
+            } else {
+                pixels[y * width + x] = 0xFFEEEEEE;
+            }
+        }
+    }
+
+    munmap(data, size);
+    wl_buffer_add_listener(buffer, &wl_buffer_listener, NULL);
+    return buffer;
+}
+
+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);
+
+    wl_shm_add_listener(state.wl_shm, &wl_shm_listener, &state);
+
+    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;
+}