wlroots/examples/layer-shell.c

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C
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#define _POSIX_C_SOURCE 199309L
#include <assert.h>
#include <GLES2/gl2.h>
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#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <time.h>
#include <unistd.h>
#include <wayland-client.h>
#include <wayland-cursor.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 wl_seat *seat = NULL;
static struct wl_shm *shm = NULL;
static struct wl_pointer *pointer = NULL;
static struct wl_keyboard *keyboard = NULL;
static struct zwlr_layer_shell_v1 *layer_shell = NULL;
struct zwlr_layer_surface_v1 *layer_surface;
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;
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static uint32_t output = UINT32_MAX;
static uint32_t layer = ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND;
static uint32_t anchor = 0;
static uint32_t width = 256, height = 256;
static int32_t margin_top = 0;
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static double alpha = 1.0;
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static bool run_display = true;
static bool animate = false;
static bool keyboard_interactive = false;
static double frame = 0;
static int cur_x = -1, cur_y = -1;
static int buttons = 0;
struct wl_cursor_theme *cursor_theme;
struct wl_cursor_image *cursor_image;
struct wl_surface *cursor_surface;
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static struct {
struct timespec last_frame;
float color[3];
int dec;
} demo;
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);
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struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
long ms = (ts.tv_sec - demo.last_frame.tv_sec) * 1000 +
(ts.tv_nsec - demo.last_frame.tv_nsec) / 1000000;
int inc = (demo.dec + 1) % 3;
if (!buttons) {
demo.color[inc] += ms / 2000.0f;
demo.color[demo.dec] -= ms / 2000.0f;
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if (demo.color[demo.dec] < 0.0f) {
demo.color[inc] = 1.0f;
demo.color[demo.dec] = 0.0f;
demo.dec = inc;
}
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}
if (animate) {
frame += ms / 50.0;
int32_t old_top = margin_top;
margin_top = -(20 - ((int)frame % 20));
if (old_top != margin_top) {
zwlr_layer_surface_v1_set_margin(layer_surface,
margin_top, 0, 0, 0);
wl_surface_commit(wl_surface);
}
}
glViewport(0, 0, width, height);
if (buttons) {
glClearColor(1, 1, 1, alpha);
} else {
glClearColor(demo.color[0], demo.color[1], demo.color[2], alpha);
}
glClear(GL_COLOR_BUFFER_BIT);
if (cur_x != -1 && cur_y != -1) {
glEnable(GL_SCISSOR_TEST);
glScissor(cur_x, height - cur_y, 5, 5);
glClearColor(0, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
}
frame_callback = wl_surface_frame(wl_surface);
wl_callback_add_listener(frame_callback, &frame_listener, NULL);
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eglSwapBuffers(egl.display, egl_surface);
demo.last_frame = ts;
}
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;
if (egl_window) {
wl_egl_window_resize(egl_window, width, height, 0, 0);
}
zwlr_layer_surface_v1_ack_configure(surface, serial);
}
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static void layer_surface_closed(void *data,
struct zwlr_layer_surface_v1 *surface) {
eglDestroySurface(egl.display, egl_surface);
wl_egl_window_destroy(egl_window);
zwlr_layer_surface_v1_destroy(surface);
wl_surface_destroy(wl_surface);
run_display = false;
}
struct zwlr_layer_surface_v1_listener layer_surface_listener = {
.configure = layer_surface_configure,
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.closed = layer_surface_closed,
};
static void wl_pointer_enter(void *data, struct wl_pointer *wl_pointer,
uint32_t serial, struct wl_surface *surface,
wl_fixed_t surface_x, wl_fixed_t surface_y) {
wl_surface_attach(cursor_surface,
wl_cursor_image_get_buffer(cursor_image), 0, 0);
wl_pointer_set_cursor(wl_pointer, serial, cursor_surface,
cursor_image->hotspot_x, cursor_image->hotspot_y);
wl_surface_commit(cursor_surface);
}
static void wl_pointer_leave(void *data, struct wl_pointer *wl_pointer,
uint32_t serial, struct wl_surface *surface) {
cur_x = cur_y = -1;
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buttons = 0;
}
static void wl_pointer_motion(void *data, struct wl_pointer *wl_pointer,
uint32_t time, wl_fixed_t surface_x, wl_fixed_t surface_y) {
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cur_x = wl_fixed_to_int(surface_x);
cur_y = wl_fixed_to_int(surface_y);
}
static void wl_pointer_button(void *data, struct wl_pointer *wl_pointer,
uint32_t serial, uint32_t time, uint32_t button, uint32_t state) {
if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
buttons++;
} else {
buttons--;
}
}
static void wl_pointer_axis(void *data, struct wl_pointer *wl_pointer,
uint32_t time, uint32_t axis, wl_fixed_t value) {
// Who cares
}
static void wl_pointer_frame(void *data, struct wl_pointer *wl_pointer) {
// Who cares
}
static void wl_pointer_axis_source(void *data, struct wl_pointer *wl_pointer,
uint32_t axis_source) {
// Who cares
}
static void wl_pointer_axis_stop(void *data, struct wl_pointer *wl_pointer,
uint32_t time, uint32_t axis) {
// Who cares
}
static void wl_pointer_axis_discrete(void *data, struct wl_pointer *wl_pointer,
uint32_t axis, int32_t discrete) {
// Who cares
}
struct wl_pointer_listener pointer_listener = {
.enter = wl_pointer_enter,
.leave = wl_pointer_leave,
.motion = wl_pointer_motion,
.button = wl_pointer_button,
.axis = wl_pointer_axis,
.frame = wl_pointer_frame,
.axis_source = wl_pointer_axis_source,
.axis_stop = wl_pointer_axis_stop,
.axis_discrete = wl_pointer_axis_discrete,
};
static void wl_keyboard_keymap(void *data, struct wl_keyboard *wl_keyboard,
uint32_t format, int32_t fd, uint32_t size) {
// Who cares
}
static void wl_keyboard_enter(void *data, struct wl_keyboard *wl_keyboard,
uint32_t serial, struct wl_surface *surface, struct wl_array *keys) {
wlr_log(L_DEBUG, "Keyboard enter");
}
static void wl_keyboard_leave(void *data, struct wl_keyboard *wl_keyboard,
uint32_t serial, struct wl_surface *surface) {
wlr_log(L_DEBUG, "Keyboard leave");
}
static void wl_keyboard_key(void *data, struct wl_keyboard *wl_keyboard,
uint32_t serial, uint32_t time, uint32_t key, uint32_t state) {
wlr_log(L_DEBUG, "Key event: %d %d", key, state);
}
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) {
// Who cares
}
static void wl_keyboard_repeat_info(void *data, struct wl_keyboard *wl_keyboard,
int32_t rate, int32_t delay) {
// Who cares
}
static struct wl_keyboard_listener 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 seat_handle_capabilities(void *data, struct wl_seat *wl_seat,
enum wl_seat_capability caps) {
if ((caps & WL_SEAT_CAPABILITY_POINTER)) {
pointer = wl_seat_get_pointer(wl_seat);
wl_pointer_add_listener(pointer, &pointer_listener, NULL);
}
if ((caps & WL_SEAT_CAPABILITY_KEYBOARD)) {
keyboard = wl_seat_get_keyboard(wl_seat);
wl_keyboard_add_listener(keyboard, &keyboard_listener, NULL);
}
}
static void seat_handle_name(void *data, struct wl_seat *wl_seat,
const char *name) {
// Who cares
}
const struct wl_seat_listener seat_listener = {
.capabilities = seat_handle_capabilities,
.name = seat_handle_name,
};
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_shm_interface.name) == 0) {
shm = wl_registry_bind(registry, name,
&wl_shm_interface, 1);
} else if (strcmp(interface, "wl_output") == 0) {
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if (output != UINT32_MAX) {
if (!wl_output) {
wl_output = wl_registry_bind(registry, name,
&wl_output_interface, 1);
} else {
output--;
}
}
} else if (strcmp(interface, wl_seat_interface.name) == 0) {
seat = wl_registry_bind(registry, name,
&wl_seat_interface, 1);
wl_seat_add_listener(seat, &seat_listener, NULL);
} 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";
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int exclusive_zone = 0;
int32_t margin_right = 0, margin_bottom = 0, margin_left = 0;
bool found;
int c;
while ((c = getopt(argc, argv, "knw:h:o:l:a:x:m:t:")) != -1) {
switch (c) {
case 'o':
output = atoi(optarg);
break;
case 'w':
width = atoi(optarg);
break;
case 'h':
height = atoi(optarg);
break;
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case 'x':
exclusive_zone = 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) {
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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) {
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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;
}
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break;
}
case 't':
alpha = atof(optarg);
break;
case 'm': {
char *endptr = optarg;
margin_top = strtol(endptr, &endptr, 10);
assert(*endptr == ',');
margin_right = strtol(endptr + 1, &endptr, 10);
assert(*endptr == ',');
margin_bottom = strtol(endptr + 1, &endptr, 10);
assert(*endptr == ',');
margin_left = strtol(endptr + 1, &endptr, 10);
assert(!*endptr);
break;
}
case 'n':
animate = true;
break;
case 'k':
keyboard_interactive = true;
break;
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, &registry_listener, NULL);
wl_display_roundtrip(display);
if (compositor == NULL) {
fprintf(stderr, "wl_compositor not available\n");
return 1;
}
if (shm == NULL) {
fprintf(stderr, "wl_shm not available\n");
return 1;
}
if (layer_shell == NULL) {
fprintf(stderr, "layer_shell not available\n");
return 1;
}
cursor_theme = wl_cursor_theme_load(NULL, 16, shm);
assert(cursor_theme);
struct wl_cursor *cursor;
cursor = wl_cursor_theme_get_cursor(cursor_theme, "crosshair");
assert(cursor);
cursor_image = cursor->images[0];
cursor_surface = wl_compositor_create_surface(compositor);
assert(cursor_surface);
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EGLint attribs[] = { EGL_ALPHA_SIZE, 8, EGL_NONE };
wlr_egl_init(&egl, EGL_PLATFORM_WAYLAND_EXT, display,
attribs, WL_SHM_FORMAT_ARGB8888);
wl_surface = wl_compositor_create_surface(compositor);
assert(wl_surface);
layer_surface = zwlr_layer_shell_v1_get_layer_surface(layer_shell,
wl_surface, wl_output, layer, namespace);
assert(layer_surface);
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zwlr_layer_surface_v1_set_size(layer_surface, width, height);
zwlr_layer_surface_v1_set_anchor(layer_surface, anchor);
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zwlr_layer_surface_v1_set_exclusive_zone(layer_surface, exclusive_zone);
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zwlr_layer_surface_v1_set_margin(layer_surface,
margin_top, margin_right, margin_bottom, margin_left);
zwlr_layer_surface_v1_set_keyboard_interactivity(
layer_surface, keyboard_interactive);
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zwlr_layer_surface_v1_add_listener(layer_surface,
&layer_surface_listener, layer_surface);
wl_surface_commit(wl_surface);
wl_display_roundtrip(display);
egl_window = wl_egl_window_create(wl_surface, width, height);
assert(egl_window);
egl_surface = wlr_egl_create_surface(&egl, egl_window);
assert(egl_surface);
wl_display_roundtrip(display);
draw();
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while (wl_display_dispatch(display) != -1 && run_display) {
// This space intentionally left blank
}
wl_cursor_theme_destroy(cursor_theme);
return 0;
}