shm wayland window

Makefile

@@ -5,9 +5,10 @@ LDLIBS+=$(shell pkg-config --libs $(LIBS))
 WAYLAND_PROTOCOLS=$(shell pkg-config --variable=pkgdatadir wayland-protocols)
 WAYLAND_SCANNER=$(shell pkg-config --variable=wayland_scanner wayland-scanner)
 
-glonkers: wlr-layer-shell-unstable-v1-protocol.o xdg-shell-protocol.o renderer.o
-glonkers.o: wlr-layer-shell-unstable-v1-protocol.h xdg-shell-protocol.h renderer.h
+glonkers: wlr-layer-shell-unstable-v1-protocol.o xdg-shell-protocol.o renderer.o shm.o
+glonkers.o: wlr-layer-shell-unstable-v1-protocol.h xdg-shell-protocol.h renderer.h shm.h
 renderer.o: renderer.h
+shm.o:
 
 xdg-shell-protocol.h:
 	$(WAYLAND_SCANNER) client-header $(WAYLAND_PROTOCOLS)/stable/xdg-shell/xdg-shell.xml $@

glonkers.c

@@ -7,7 +7,10 @@
 #include <wayland-util.h>
 #include <SDL3/SDL.h>
 #include <pthread.h>
+#include <sys/mman.h>
 #include "renderer.h"
+#include "shm.h"
+#include "xdg-shell-protocol.h"
 
 //int main() {
 //    struct wl_display *display = wl_display_connect(NULL);
@@ -22,10 +25,96 @@
 //
 //    wl_display_disconnect(display);
 //}
-struct our_state {
-    // ...
-    struct wl_compositor *compositor;
-    // ...
+
+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
@@ -35,12 +124,21 @@ registry_handle_global(void *data, struct wl_registry *registry,
 	printf("interface: '%s', version: %d, name: %d\n",
 			interface, version, name);
 
-    struct our_state *state = data;
+    struct client_state *state = data;
 
-    if (strcmp(interface, wl_compositor_interface.name) == 0) {
-        state->compositor = wl_registry_bind(
+    if (strcmp(interface, wl_shm_interface.name) == 0) {
+        state->wl_shm = wl_registry_bind(
+                registry, name, &wl_shm_interface, 1);
+    } else if (strcmp(interface, wl_compositor_interface.name) == 0) {
+        state->wl_compositor = wl_registry_bind(
                 registry, name, &wl_compositor_interface, 4);
+    } else if (strcmp(interface, xdg_wm_base_interface.name) == 0) {
+        state->xdg_wm_base = wl_registry_bind(
+                registry, name, &xdg_wm_base_interface, 1);
+        xdg_wm_base_add_listener(state->xdg_wm_base,
+                &xdg_wm_base_listener, state);
     }
+
 }
 
 static void
@@ -51,7 +149,7 @@ registry_handle_global_remove(void *data, struct wl_registry *registry,
 }
 
 static const struct wl_registry_listener
-registry_listener = {
+wl_registry_listener = {
 	.global = registry_handle_global,
 	.global_remove = registry_handle_global_remove,
 };
@@ -59,11 +157,31 @@ registry_listener = {
 int
 main(int argc, char *argv[])
 {
-    struct our_state state = { 0 };
-	struct wl_display *display = wl_display_connect(NULL);
-	struct wl_registry *registry = wl_display_get_registry(display);
-    wl_registry_add_listener(registry, &registry_listener, &state);
-	wl_display_roundtrip(display);
+    //struct our_state state = { 0 };
+	//struct wl_display *display = wl_display_connect(NULL);
+	//struct wl_registry *registry = wl_display_get_registry(display);
+    //wl_registry_add_listener(registry, &registry_listener, &state);
+	//wl_display_roundtrip(display);
+	//return 0;
+
+    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;
 }
 

shm.c

@@ -0,0 +1,53 @@
+#define _POSIX_C_SOURCE 200112L
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <time.h>
+#include <unistd.h>
+#include "shm.h"
+
+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;
+}
+
+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;
+}

shm.h

@@ -0,0 +1,8 @@
+#ifndef SHM_H
+#define SHM_H
+
+#include <unistd.h>
+
+int allocate_shm_file(size_t size);
+
+#endif