wlroots/examples/pointer-constraints.c

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C
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#include <GLES2/gl2.h>
#include <linux/input-event-codes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wayland-client.h>
#include <wayland-egl.h>
#include <wlr/render/egl.h>
#include "xdg-shell-client-protocol.h"
#include "pointer-constraints-unstable-v1-client-protocol.h"
static int width = 512, height = 512;
static struct wl_compositor *compositor = NULL;
static struct wl_seat *seat = NULL;
static struct xdg_wm_base *wm_base = NULL;
static struct zwp_pointer_constraints_v1 *pointer_constraints = NULL;
struct wlr_egl *egl;
struct wl_egl_window *egl_window;
struct wlr_egl_surface *egl_surface;
struct zwp_locked_pointer_v1* locked_pointer;
struct zwp_confined_pointer_v1* confined_pointer;
enum {
REGION_TYPE_NONE,
REGION_TYPE_DISJOINT,
REGION_TYPE_JOINT,
REGION_TYPE_MAX
} region_type = REGION_TYPE_NONE;
struct wl_region *regions[3];
static void draw(void) {
eglMakeCurrent(egl->display, egl_surface, egl_surface, egl->context);
float color[] = {1.0, 1.0, 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);
}
static void pointer_handle_button(void *data, struct wl_pointer *pointer,
uint32_t serial, uint32_t time, uint32_t button, uint32_t state_w) {
struct wl_surface *surface = data;
if (button == BTN_LEFT && state_w == WL_POINTER_BUTTON_STATE_PRESSED) {
region_type = (region_type + 1) % REGION_TYPE_MAX;
if (locked_pointer) {
zwp_locked_pointer_v1_set_region(locked_pointer,
regions[region_type]);
} else if (confined_pointer) {
zwp_confined_pointer_v1_set_region(confined_pointer,
regions[region_type]);
}
wl_surface_commit(surface);
}
}
static void pointer_handle_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) {
// This space intentionally left blank
}
static void pointer_handle_leave(void *data, struct wl_pointer *wl_pointer,
uint32_t serial, struct wl_surface *surface) {
// This space intentionally left blank
}
static void pointer_handle_motion(void *data, struct wl_pointer *wl_pointer,
uint32_t time, wl_fixed_t surface_x, wl_fixed_t surface_y) {
// This space intentionally left blank
}
static void pointer_handle_axis(void *data, struct wl_pointer *wl_pointer,
uint32_t time, uint32_t axis, wl_fixed_t value) {
// This space intentionally left blank
}
static void pointer_handle_frame(void *data, struct wl_pointer *wl_pointer) {
// This space intentionally left blank
}
static void pointer_handle_axis_source(void *data,
struct wl_pointer *wl_pointer, uint32_t axis_source) {
// This space intentionally left blank
}
static void pointer_handle_axis_stop(void *data,
struct wl_pointer *wl_pointer, uint32_t time, uint32_t axis) {
// This space intentionally left blank
}
static void pointer_handle_axis_discrete(void *data,
struct wl_pointer *wl_pointer, uint32_t axis, int32_t discrete) {
// This space intentionally left blank
}
static const struct wl_pointer_listener pointer_listener = {
.enter = pointer_handle_enter,
.leave = pointer_handle_leave,
.motion = pointer_handle_motion,
.button = pointer_handle_button,
.axis = pointer_handle_axis,
.frame = pointer_handle_frame,
.axis_source = pointer_handle_axis_source,
.axis_stop = pointer_handle_axis_stop,
.axis_discrete = pointer_handle_axis_discrete,
};
static void xdg_surface_handle_configure(void *data,
struct xdg_surface *xdg_surface, uint32_t serial) {
xdg_surface_ack_configure(xdg_surface, serial);
wl_egl_window_resize(egl_window, width, height, 0, 0);
draw();
}
static const struct xdg_surface_listener xdg_surface_listener = {
.configure = xdg_surface_handle_configure,
};
static void xdg_toplevel_handle_configure(void *data,
struct xdg_toplevel *xdg_toplevel, int32_t w, int32_t h,
struct wl_array *states) {
width = w;
height = h;
}
static void xdg_toplevel_handle_close(void *data,
struct xdg_toplevel *xdg_toplevel) {
exit(EXIT_SUCCESS);
}
static const struct xdg_toplevel_listener xdg_toplevel_listener = {
.configure = xdg_toplevel_handle_configure,
.close = xdg_toplevel_handle_close,
};
static void handle_global(void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version) {
if (strcmp(interface, wl_compositor_interface.name) == 0) {
compositor = wl_registry_bind(registry, name,
&wl_compositor_interface, 1);
} else if (strcmp(interface, xdg_wm_base_interface.name) == 0) {
wm_base = wl_registry_bind(registry, name, &xdg_wm_base_interface, 1);
} else if (strcmp(interface, wl_seat_interface.name) == 0) {
seat = wl_registry_bind(registry, name, &wl_seat_interface, version);
} else if (strcmp(interface,
zwp_pointer_constraints_v1_interface.name) == 0) {
pointer_constraints = wl_registry_bind(registry, name,
&zwp_pointer_constraints_v1_interface, version);
}
}
static const struct wl_registry_listener registry_listener = {
.global = handle_global,
.global_remove = NULL,
};
int main(int argc, char **argv) {
if (argc != 4) {
goto invalid_args;
}
bool lock;
if (strcmp(argv[1], "lock") == 0) {
lock = true;
} else if (strcmp(argv[1], "confine") == 0) {
lock = false;
} else {
goto invalid_args;
}
enum zwp_pointer_constraints_v1_lifetime lifetime;
if (strcmp(argv[2], "oneshot") == 0) {
lifetime = ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_ONESHOT;
} else if (strcmp(argv[2], "persistent") == 0) {
lifetime = ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT;
} else {
goto invalid_args;
}
if (strcmp(argv[3], "no-region") == 0) {
region_type = REGION_TYPE_NONE;
} else if (strcmp(argv[3], "disjoint-region") == 0) {
region_type = REGION_TYPE_DISJOINT;
} else if (strcmp(argv[3], "joint-region") == 0) {
region_type = REGION_TYPE_JOINT;
}
struct wl_display *display = wl_display_connect(NULL);
struct wl_registry *registry = wl_display_get_registry(display);
wl_registry_add_listener(registry, &registry_listener, NULL);
wl_display_roundtrip(display);
struct wl_region *disjoint_region = wl_compositor_create_region(compositor);
wl_region_add(disjoint_region, 0, 0, 255, 256);
wl_region_add(disjoint_region, 257, 0, 255, 256);
regions[REGION_TYPE_DISJOINT] = disjoint_region;
struct wl_region *joint_region = wl_compositor_create_region(compositor);
wl_region_add(joint_region, 0, 0, 256, 256);
wl_region_add(joint_region, 256, 0, 256, 256);
wl_region_add(joint_region, 256, 256, 256, 256);
regions[REGION_TYPE_JOINT] = joint_region;
EGLint attribs[] = { EGL_NONE };
egl = wlr_egl_create(EGL_PLATFORM_WAYLAND_EXT, display, attribs);
struct wl_surface *surface = wl_compositor_create_surface(compositor);
struct xdg_surface *xdg_surface =
xdg_wm_base_get_xdg_surface(wm_base, surface);
struct xdg_toplevel *xdg_toplevel = xdg_surface_get_toplevel(xdg_surface);
xdg_surface_add_listener(xdg_surface, &xdg_surface_listener, NULL);
xdg_toplevel_add_listener(xdg_toplevel, &xdg_toplevel_listener, NULL);
struct wl_pointer *pointer = wl_seat_get_pointer(seat);
wl_pointer_add_listener(pointer, &pointer_listener, surface);
if (lock) {
locked_pointer = zwp_pointer_constraints_v1_lock_pointer(
pointer_constraints, surface, pointer,
regions[region_type], lifetime);
zwp_locked_pointer_v1_set_cursor_position_hint(locked_pointer,
wl_fixed_from_int(128), wl_fixed_from_int(128));
} else {
confined_pointer = zwp_pointer_constraints_v1_confine_pointer(
pointer_constraints, surface, pointer,
regions[region_type], lifetime);
}
wl_surface_commit(surface);
egl_window = wl_egl_window_create(surface, width, height);
egl_surface = wlr_egl_create_surface(egl, egl_window);
wl_display_roundtrip(display);
draw();
while (wl_display_dispatch(display) != -1) {}
return EXIT_SUCCESS;
invalid_args:
fprintf(stderr, "pointer-constraints <lock | confine> "
"<oneshot | persistent> "
"<no-region | disjoint-rejoin | joint-region>\n");
return EXIT_FAILURE;
}