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#define _POSIX_C_SOURCE 2
#include <GLES2/gl2.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wayland-client.h>
#include <wayland-egl.h>
#include <wlr/render/egl.h>
#include <wlr/util/log.h>
#include "wlr-layer-shell-unstable-v1-client-protocol.h"
static struct wl_compositor *compositor = NULL;
static struct zwlr_layer_shell_v1 *layer_shell = NULL;
static struct wl_output *wl_output = NULL;
struct wl_surface *wl_surface;
struct wlr_egl egl;
struct wl_egl_window *egl_window;
struct wlr_egl_surface *egl_surface;
struct wl_callback *frame_callback;
static uint32_t output = 0;
static uint32_t layer = ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND;
static uint32_t anchor = 0;
static int32_t width = 256, height = 256;
static void draw(void);
static void surface_frame_callback(
void *data, struct wl_callback *cb, uint32_t time) {
wl_callback_destroy(cb);
frame_callback = NULL;
draw();
}
static struct wl_callback_listener frame_listener = {
.done = surface_frame_callback
};
static void draw(void) {
eglMakeCurrent(egl.display, egl_surface, egl_surface, egl.context);
wlr_log(L_DEBUG, "Drawing frame");
float color[] = {1.0, 0.0, 0.0, 1.0};
glViewport(0, 0, width, height);
glClearColor(color[0], color[1], color[2], 1.0);
glClear(GL_COLOR_BUFFER_BIT);
eglSwapBuffers(egl.display, egl_surface);
frame_callback = wl_surface_frame(wl_surface);
wl_callback_add_listener(frame_callback, &frame_listener, NULL);
}
static void layer_surface_configure(void *data,
struct zwlr_layer_surface_v1 *surface,
uint32_t serial, uint32_t w, uint32_t h) {
width = w;
height = h;
zwlr_layer_surface_v1_ack_configure(surface, serial);
}
struct zwlr_layer_surface_v1_listener layer_surface_listener = {
.configure = layer_surface_configure,
};
static void handle_global(void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version) {
if (strcmp(interface, "wl_compositor") == 0) {
compositor = wl_registry_bind(registry, name,
&wl_compositor_interface, 1);
} else if (strcmp(interface, "wl_output") == 0) {
if (output == 0) {
wl_output = wl_registry_bind(registry, name,
&wl_output_interface, 1);
} else {
output--;
}
} else if (strcmp(interface, zwlr_layer_shell_v1_interface.name) == 0) {
layer_shell = wl_registry_bind(
registry, name, &zwlr_layer_shell_v1_interface, 1);
}
}
static void handle_global_remove(void *data, struct wl_registry *registry,
uint32_t name) {
// who cares
}
static const struct wl_registry_listener registry_listener = {
.global = handle_global,
.global_remove = handle_global_remove,
};
int main(int argc, char **argv) {
wlr_log_init(L_DEBUG, NULL);
char *namespace = "wlroots";
bool found;
int c;
while ((c = getopt(argc, argv, "w:h:o:l:a:")) != -1) {
switch (c) {
case 'o':
output = atoi(optarg);
break;
case 'w':
width = atoi(optarg);
break;
case 'h':
height = atoi(optarg);
break;
case 'l': {
struct {
char *name;
enum zwlr_layer_shell_v1_layer value;
} layers[] = {
{ "background", ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND },
{ "bottom", ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM },
{ "top", ZWLR_LAYER_SHELL_V1_LAYER_TOP },
{ "overlay", ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY },
};
found = false;
for (size_t i = 0; i < sizeof(layers) / sizeof(layers[0]); ++i) {
if (strcmp(optarg, layers[i].name) == 0) {
layer = layers[i].value;
found = true;
break;
}
}
if (!found) {
fprintf(stderr, "invalid layer %s\n", optarg);
return 1;
}
break;
}
case 'a': {
struct {
char *name;
uint32_t value;
} anchors[] = {
{ "top", ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP },
{ "bottom", ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM },
{ "left", ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT },
{ "right", ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT },
};
found = false;
for (size_t i = 0; i < sizeof(anchors) / sizeof(anchors[0]); ++i) {
if (strcmp(optarg, anchors[i].name) == 0) {
anchor |= anchors[i].value;
found = true;
break;
}
}
if (!found) {
fprintf(stderr, "invalid anchor %s\n", optarg);
return 1;
}
}
default:
break;
}
}
struct wl_display *display = wl_display_connect(NULL);
if (display == NULL) {
fprintf(stderr, "Failed to create display\n");
return 1;
}
struct wl_registry *registry = wl_display_get_registry(display);
wl_registry_add_listener(registry, ®istry_listener, NULL);
wl_display_dispatch(display);
wl_display_roundtrip(display);
if (compositor == NULL) {
fprintf(stderr, "wl-compositor not available\n");
return 1;
}
if (layer_shell == NULL) {
fprintf(stderr, "layer-shell not available\n");
return 1;
}
if (wl_output == NULL) {
fprintf(stderr, "wl_output not available\n");
return 1;
}
wl_surface = wl_compositor_create_surface(compositor);
struct zwlr_layer_surface_v1 *layer_surface =
zwlr_layer_shell_v1_get_layer_surface(layer_shell,
wl_surface, wl_output, layer, namespace);
zwlr_layer_surface_v1_set_size(layer_surface, width, height);
zwlr_layer_surface_v1_set_anchor(layer_surface, anchor);
zwlr_layer_surface_v1_add_listener(layer_surface,
&layer_surface_listener, layer_surface);
// TODO: margin, interactivity, exclusive zone
wl_surface_commit(wl_surface);
wl_display_dispatch(display);
wl_display_roundtrip(display);
wlr_egl_init(&egl, EGL_PLATFORM_WAYLAND_EXT, display, NULL,
WL_SHM_FORMAT_ARGB8888);
egl_window = wl_egl_window_create(wl_surface, width, height);
egl_surface = wlr_egl_create_surface(&egl, egl_window);
wl_display_roundtrip(display);
draw();
while (wl_display_dispatch(display) != -1) {
// This space intentionally left blank
}
return 0;
}
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