wlroots/examples/relative-pointer-unstable-v1.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <GLES2/gl2.h>
#include <linux/input-event-codes.h>
#include <wayland-egl.h>
#include <wlr/render/egl.h>
#include "pointer-constraints-unstable-v1-client-protocol.h"
#include "relative-pointer-unstable-v1-client-protocol.h"
#include "xdg-shell-client-protocol.h"
/**
* structs storing global state
*
* These are passed around as user data in the wayland globals.
*/
struct egl_info {
struct wlr_egl *egl;
struct wl_egl_window *egl_window;
struct wlr_egl_surface *egl_surface;
uint32_t width;
uint32_t height;
struct wl_surface *surface;
struct wl_callback *frame_callback;
};
struct window {
struct egl_info *egl_info;
struct wl_pointer *pointer;
struct zwp_locked_pointer_v1 *locked_pointer;
struct zwp_relative_pointer_v1 *relative_pointer;
int32_t pointer_x, pointer_y;
uint32_t last_draw;
};
/**
* surface handling and helpers
*
* draw_cursor and draw_relative_cursor draw a small 5px by 5px box around the
* cursor and relative motion coordinates respectively. draw_background colors
* the background black.
*
* The functions are somewhat duplicated, but it doesn't really matter.
*/
static void surface_callback_handle_done(void *data,
struct wl_callback *callback, uint32_t time) {
wl_callback_destroy(callback);
struct egl_info *e = data;
e->frame_callback = NULL;
}
static struct wl_callback_listener surface_callback_listener = {
.done = surface_callback_handle_done,
};
static void draw_init(struct egl_info *e) {
eglMakeCurrent(e->egl->display, e->egl_surface,
e->egl_surface, e->egl->context);
glViewport(0, 0, e->width, e->height);
}
static void draw_cursor(struct egl_info *e, int32_t x, int32_t y) {
glEnable(GL_SCISSOR_TEST);
glScissor(x, e->height - y, 5, 5);
glClearColor(1.0f, 1.0f, 1.0f, 1.0f); /* white */
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
}
static void draw_relative_cursor(struct egl_info *e, int32_t x, int32_t y) {
glEnable(GL_SCISSOR_TEST);
glScissor(x, e->height - y, 5, 5);
glClearColor(1.0f, 0.0f, 0.0f, 1.0f); /* red */
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
}
static void draw_background(struct egl_info *e) {
glClearColor(0.0f, 0.0f, 0.0f, 1.0f); /* black */
glClear(GL_COLOR_BUFFER_BIT);
}
static void draw_end(struct egl_info *e) {
e->frame_callback = wl_surface_frame(e->surface);
wl_callback_add_listener(e->frame_callback, &surface_callback_listener, e);
eglSwapBuffers(e->egl->display, e->egl_surface);
}
/**
* registry and globals handling
*/
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;
static struct zwp_relative_pointer_manager_v1 *relative_pointer_manager = NULL;
static void registry_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, version);
} else if (strcmp(interface, xdg_wm_base_interface.name) == 0) {
wm_base = wl_registry_bind(registry, name,
&xdg_wm_base_interface, version);
} 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);
} else if (strcmp(interface, zwp_relative_pointer_manager_v1_interface.name) == 0) {
relative_pointer_manager = wl_registry_bind(registry, name,
&zwp_relative_pointer_manager_v1_interface, version);
}
}
static void registry_handle_global_remove(void *data, struct wl_registry *registry,
uint32_t time) {
/* This space intentionally left blank */
}
static const struct wl_registry_listener registry_listener = {
.global = registry_handle_global,
.global_remove = registry_handle_global_remove,
};
/**
* xdg_surface handling
*/
static void xdg_surface_handle_configure(void *data,
struct xdg_surface *xdg_surface, uint32_t serial) {
struct egl_info *e = data;
xdg_surface_ack_configure(xdg_surface, serial);
wl_egl_window_resize(e->egl_window, e->width, e->height, 0, 0);
draw_init(e);
draw_background(e);
draw_end(e);
}
static const struct xdg_surface_listener xdg_surface_listener = {
.configure = xdg_surface_handle_configure,
};
/**
* xdg_toplevel handling
*/
static void xdg_toplevel_handle_configure(void *data,
struct xdg_toplevel *xdg_toplevel, int32_t width, int32_t height,
struct wl_array *states) {
struct egl_info *e = data;
// TODO: Why do we get 0,0 on initialization here? (in rootston)
if (width == 0 && height == 0) {
return;
}
e->width = width;
e->height = height;
}
static void xdg_toplevel_handle_close(void *data,
struct xdg_toplevel *xdg_toplevel) {
struct egl_info *e = data;
wlr_egl_finish(e->egl);
exit(EXIT_SUCCESS);
}
static const struct xdg_toplevel_listener xdg_toplevel_listener = {
.configure = xdg_toplevel_handle_configure,
.close = xdg_toplevel_handle_close,
};
/**
* zwp_locked_pointer handling
*
* Pointer unlocks need to be handled properly since the relative pointer needs
* to be released as well. Unlocks happen when the focus is changed, for
* example.
*/
static void locked_pointer_handle_locked(void *data,
struct zwp_locked_pointer_v1 *zwp_locked_pointer_v1) {
/* This space intentionally left blank */
}
static void locked_pointer_handle_unlocked(void *data,
struct zwp_locked_pointer_v1 *zwp_locked_pointer_v1) {
struct window *w = data;
/* The locked pointer doesn't need to be destroyed since it was oneshot */
w->locked_pointer = NULL;
if (w->relative_pointer) {
/* Destroy the relative pointer */
zwp_relative_pointer_v1_destroy(w->relative_pointer);
w->relative_pointer = NULL;
}
draw_init(w->egl_info);
draw_background(w->egl_info);
draw_end(w->egl_info);
}
static const struct zwp_locked_pointer_v1_listener locked_pointer_listener = {
.locked = locked_pointer_handle_locked,
.unlocked = locked_pointer_handle_unlocked,
};
/**
* zwp_relative_pointer handling
*
* Handling relative_motion events is the meat of the code. The handler simply
* tries to indicate what the deltas look like.
*/
static void relative_pointer_handle_relative_motion(void *data,
struct zwp_relative_pointer_v1 *zwp_relative_pointer_v1,
uint32_t utime_hi, uint32_t utime_lo,
wl_fixed_t dx, wl_fixed_t dy,
wl_fixed_t dx_unaccel, wl_fixed_t dy_unaccel) {
struct window *w = data;
/**
* This renders the last location of the pointer (before it as locked), as
* well as what the position would have been after the given relative
* motion. Note that, if the device sends absolute motion events, the
* cursor location after relative motion is always identical to the actual
* cursor position.
*/
uint64_t utime = (((uint64_t) utime_hi << 32) + utime_lo) / 1000;
if (utime - w->last_draw > 30 && w->egl_info->frame_callback == NULL) {
w->last_draw = utime;
struct egl_info *e = w->egl_info;
draw_init(e);
draw_background(e);
draw_cursor(e, w->pointer_x, w->pointer_y);
draw_relative_cursor(e, w->pointer_x + wl_fixed_to_int(dx),
w->pointer_y + wl_fixed_to_int(dy));
draw_end(e);
}
}
static const struct zwp_relative_pointer_v1_listener relative_pointer_listener = {
.relative_motion = relative_pointer_handle_relative_motion,
};
/**
* wl_pointer handling
*
* The client toggles between locking the pointer and receiving relative motion
* events, and releasing the locked pointer and falling back to normal motion
* events, on a mouse button one (left mouse button) click.
*
* It additionally removes the cursor image, and indicates the pointer location
* via a small white box.
*/
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 window *w = data;
struct egl_info *e = w->egl_info;
if (button == BTN_LEFT && state_w == WL_POINTER_BUTTON_STATE_PRESSED) {
if (w->locked_pointer == NULL && w->relative_pointer == NULL) {
/* Get a locked pointer and add listener */
w->locked_pointer = zwp_pointer_constraints_v1_lock_pointer(
pointer_constraints, w->egl_info->surface, w->pointer, NULL,
ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_ONESHOT);
zwp_locked_pointer_v1_add_listener(w->locked_pointer,
&locked_pointer_listener, w);
/* Get relative pointer and add listener */
w->relative_pointer = zwp_relative_pointer_manager_v1_get_relative_pointer(
relative_pointer_manager, w->pointer);
zwp_relative_pointer_v1_add_listener(w->relative_pointer,
&relative_pointer_listener, w);
/* Commit the surface and render */
wl_surface_commit(e->surface);
draw_init(e);
draw_background(e);
draw_cursor(e, w->pointer_x, w->pointer_y);
draw_end(e);
} else if (w->locked_pointer && w->relative_pointer) {
/* Destroy the locked pointer */
zwp_locked_pointer_v1_destroy(w->locked_pointer);
w->locked_pointer = NULL;
/* Destroy the relative pointer */
zwp_relative_pointer_v1_destroy(w->relative_pointer);
w->relative_pointer = NULL;
/* Render */
draw_init(e);
draw_background(e);
draw_cursor(e, w->pointer_x, w->pointer_y);
draw_end(e);
} else {
fprintf(stderr, "Unknown state!\n");
exit(EXIT_FAILURE);
}
}
}
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) {
struct window *w = data;
wl_pointer_set_cursor(w->pointer, serial, NULL, 0, 0);
}
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) {
struct window *w = data;
struct egl_info *e = w->egl_info;
w->pointer_x = wl_fixed_to_int(surface_x);
w->pointer_y = wl_fixed_to_int(surface_y);
if (time - w->last_draw > 30 && e->frame_callback == NULL) {
w->last_draw = time;
draw_init(e);
draw_background(e);
draw_cursor(e, w->pointer_x, w->pointer_y);
draw_end(e);
}
}
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,
};
/**
* relative-pointer:
*
* This client servers as an example for the relative-pointer-v1 protocol, and
* to some extent the pointer-constraints protocol as well (the locked_pointer
* interface).
*
* The intended behavior is the following. In the default state, the client
* shows a black background, and renders the pointer location as a small white
* box. No cursor is shown. In the locked state, the pointer is locked and the
* client only listens for relative motion events, which are rendered relative
* to the last unlocked pointer location by a small red box. Clicking with the
* left mouse button toggles the state.
*
* Most of the code is standard. The interesting stuff happens in "wl_pointer
* handling" (toggling states), and "zwp_relative_pointer handling" (rendering
* relative motion events).
*/
int main(int argc, char **argv) {
/* Connect to the display */
struct wl_display *display = wl_display_connect(NULL);
if (display == NULL) {
fprintf(stderr, "Could not connect to a Wayland display\n");
return EXIT_FAILURE;
}
/* Get the registry and set listeners */
struct wl_registry *registry = wl_display_get_registry(display);
wl_registry_add_listener(registry, &registry_listener, NULL);
wl_display_dispatch(display);
wl_display_roundtrip(display);
/* Check that all the global interfaces were captured */
if (compositor == NULL) {
fprintf(stderr, "wl_compositor not available\n");
return EXIT_FAILURE;
}
if (seat == NULL) {
fprintf(stderr, "wl_seat not available\n");
return EXIT_FAILURE;
}
if (wm_base == NULL) {
fprintf(stderr, "xdg_wm_base not available\n");
return EXIT_FAILURE;
}
if (pointer_constraints == NULL) {
fprintf(stderr, "zwp_pointer_constraints_v1 not available\n");
return EXIT_FAILURE;
}
if (relative_pointer_manager == NULL) {
fprintf(stderr, "zwp_relative_pointer_manager_v1 not available\n");
return EXIT_FAILURE;
}
/* Initialize EGL context */
struct egl_info *e = calloc(1, sizeof(struct egl_info));
e->egl = calloc(1, sizeof(struct wlr_egl));
e->width = e->height = 512;
wlr_egl_init(e->egl, EGL_PLATFORM_WAYLAND_EXT, display, NULL,
WL_SHM_FORMAT_ARGB8888);
/* Create the surface and xdg_toplevels, and set listeners */
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, e);
xdg_toplevel_add_listener(xdg_toplevel, &xdg_toplevel_listener, e);
/* Create the egl window and surface */
wl_surface_commit(surface);
e->egl_window = wl_egl_window_create(surface, e->width, e->height);
e->egl_surface = wlr_egl_create_surface(e->egl, e->egl_window);
e->surface = surface;
wl_display_roundtrip(display);
/* Setup global state and render */
struct window *w = calloc(1, sizeof(struct window));
w->egl_info = e;
draw_init(e);
draw_background(e);
draw_end(e);
/* Setup the pointer */
struct wl_pointer *pointer = wl_seat_get_pointer(seat);
wl_pointer_add_listener(pointer, &pointer_listener, w);
w->pointer = pointer;
/* Run display */
while (wl_display_dispatch(display) != -1) {
/* This space intentionally left blank */
}
return EXIT_SUCCESS;
}