Merge pull request #1432 from ForTheReallys/relative-pointers

Relative pointers

12 files changed, 888 insertions, 0 deletions

diff --git a/backend/libinput/pointer.c b/backend/libinput/pointer.c
index fb85cddd..b9cf1dfe 100644
--- a/backend/libinput/pointer.c
+++ b/backend/libinput/pointer.c
@@ -36,6 +36,8 @@ void handle_pointer_motion(struct libinput_event *event,
 		usec_to_msec(libinput_event_pointer_get_time_usec(pevent));
 	wlr_event.delta_x = libinput_event_pointer_get_dx(pevent);
 	wlr_event.delta_y = libinput_event_pointer_get_dy(pevent);
+	wlr_event.unaccel_dx = libinput_event_pointer_get_dx_unaccelerated(pevent);
+	wlr_event.unaccel_dy = libinput_event_pointer_get_dy_unaccelerated(pevent);
 	wlr_signal_emit_safe(&wlr_dev->pointer->events.motion, &wlr_event);
 }
 
diff --git a/examples/meson.build b/examples/meson.build
index 589a7326..0811d1a2 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -81,6 +81,10 @@ examples = {
 		'src': 'pointer-constraints.c',
 		'dep': [wayland_client, wlr_protos, wlroots],
 	},
+	'relative-pointer': {
+		'src': 'relative-pointer-unstable-v1.c',
+		'dep': [wayland_client, wlr_protos, wlroots],
+	},
 	'dmabuf-capture': {
 		'src': 'dmabuf-capture.c',
 		'dep': [
diff --git a/examples/relative-pointer-unstable-v1.c b/examples/relative-pointer-unstable-v1.c
new file mode 100644
index 00000000..ce671f99
--- /dev/null
+++ b/examples/relative-pointer-unstable-v1.c
@@ -0,0 +1,493 @@
+#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;
+}
diff --git a/include/rootston/desktop.h b/include/rootston/desktop.h
index b1fcaca0..56d2a129 100644
--- a/include/rootston/desktop.h
+++ b/include/rootston/desktop.h
@@ -17,6 +17,7 @@
 #include <wlr/types/wlr_output.h>
 #include <wlr/types/wlr_presentation_time.h>
 #include <wlr/types/wlr_gtk_primary_selection.h>
+#include <wlr/types/wlr_relative_pointer_v1.h>
 #include <wlr/types/wlr_screencopy_v1.h>
 #include <wlr/types/wlr_screenshooter.h>
 #include <wlr/types/wlr_text_input_v3.h>
@@ -65,6 +66,7 @@ struct roots_desktop {
 	struct wlr_pointer_constraints_v1 *pointer_constraints;
 	struct wlr_presentation *presentation;
 	struct wlr_foreign_toplevel_manager_v1 *foreign_toplevel_manager_v1;
+	struct wlr_relative_pointer_manager_v1 *relative_pointer_manager;
 
 	struct wl_listener new_output;
 	struct wl_listener layout_change;
diff --git a/include/wlr/types/meson.build b/include/wlr/types/meson.build
index 752c0dea..dfb55ec9 100644
--- a/include/wlr/types/meson.build
+++ b/include/wlr/types/meson.build
@@ -27,6 +27,7 @@ install_headers(
 	'wlr_presentation_time.h',
 	'wlr_primary_selection.h',
 	'wlr_region.h',
+	'wlr_relative_pointer_v1.h',
 	'wlr_screencopy_v1.h',
 	'wlr_screenshooter.h',
 	'wlr_seat.h',
diff --git a/include/wlr/types/wlr_pointer.h b/include/wlr/types/wlr_pointer.h
index 7dc643ae..6da4c02a 100644
--- a/include/wlr/types/wlr_pointer.h
+++ b/include/wlr/types/wlr_pointer.h
@@ -32,6 +32,7 @@ struct wlr_event_pointer_motion {
 	struct wlr_input_device *device;
 	uint32_t time_msec;
 	double delta_x, delta_y;
+	double unaccel_dx, unaccel_dy;
 };
 
 struct wlr_event_pointer_motion_absolute {
diff --git a/include/wlr/types/wlr_relative_pointer_v1.h b/include/wlr/types/wlr_relative_pointer_v1.h
new file mode 100644
index 00000000..f9f91219
--- /dev/null
+++ b/include/wlr/types/wlr_relative_pointer_v1.h
@@ -0,0 +1,81 @@
+/*
+ * This an unstable interface of wlroots. No guarantees are made regarding the
+ * future consistency of this API.
+ */
+#ifndef WLR_USE_UNSTABLE
+#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
+#endif
+
+#ifndef WLR_TYPES_WLR_RELATIVE_POINTER_V1_H
+#define WLR_TYPES_WLR_RELATIVE_POINTER_V1_H
+
+#include <wayland-server.h>
+
+
+/**
+ * This protocol specifies a set of interfaces used for making clients able to
+ * receive relative pointer events not obstructed by barriers (such as the
+ * monitor edge or pointer constraints).
+ */
+
+
+/**
+ * A global interface used for getting the relative pointer object for a given
+ * pointer.
+ */
+
+struct wlr_relative_pointer_manager_v1 {
+	struct wl_global *global;
+	struct wl_list resources; // wl_resource_get_link()
+	struct wl_list relative_pointers; // wlr_relative_pointer_v1::link
+
+	struct {
+		struct wl_signal destroy;
+		struct wl_signal new_relative_pointer; //wlr_relative_pointer_v1
+	} events;
+
+	struct wl_listener display_destroy_listener;
+
+	void *data;
+};
+
+
+/**
+ * A wp_relative_pointer object is an extension to the wl_pointer interface
+ * used for emitting relative pointer events. It shares the same focus as
+ * wl_pointer objects of the same seat and will only emit events when it has
+ * focus.
+ */
+
+struct wlr_relative_pointer_v1 {
+	struct wl_resource *resource;
+	struct wl_resource *pointer;
+	struct wlr_seat *seat;
+	struct wl_list link; // wlr_relative_pointer_manager_v1::relative_pointers
+
+	struct {
+		struct wl_signal destroy;
+	} events;
+
+	struct wl_listener seat_destroy;
+	struct wl_listener pointer_destroy;
+
+	void *data;
+};
+
+struct wlr_relative_pointer_manager_v1 *wlr_relative_pointer_manager_v1_create(
+	struct wl_display *display);
+void wlr_relative_pointer_manager_v1_destroy(
+	struct wlr_relative_pointer_manager_v1 *relative_pointer_manager);
+
+/**
+ * Send a relative motion event to the seat with the same wl_pointer as relative_pointer
+ */
+void wlr_relative_pointer_v1_send_relative_motion(
+	struct wlr_relative_pointer_v1 *relative_pointer, uint64_t time_msec,
+	double dx, double dy, double dx_unaccel, double dy_unaccel);
+
+struct wlr_relative_pointer_v1 *wlr_relative_pointer_v1_from_resource(
+	struct wl_resource *resource);
+
+#endif
diff --git a/protocol/meson.build b/protocol/meson.build
index 58f57046..6d5acf37 100644
--- a/protocol/meson.build
+++ b/protocol/meson.build
@@ -20,6 +20,7 @@ protocols = [
 	[wl_protocol_dir, 'unstable/xdg-output/xdg-output-unstable-v1.xml'],
 	[wl_protocol_dir, 'unstable/xdg-shell/xdg-shell-unstable-v6.xml'],
 	[wl_protocol_dir, 'unstable/pointer-constraints/pointer-constraints-unstable-v1.xml'],
+	[wl_protocol_dir, 'unstable/relative-pointer/relative-pointer-unstable-v1.xml'],
 	'gamma-control.xml',
 	'gtk-primary-selection.xml',
 	'idle.xml',
@@ -42,6 +43,7 @@ client_protocols = [
 	[wl_protocol_dir, 'unstable/xdg-decoration/xdg-decoration-unstable-v1.xml'],
 	[wl_protocol_dir, 'unstable/xdg-shell/xdg-shell-unstable-v6.xml'],
 	[wl_protocol_dir, 'unstable/pointer-constraints/pointer-constraints-unstable-v1.xml'],
+	[wl_protocol_dir, 'unstable/relative-pointer/relative-pointer-unstable-v1.xml'],
 	'idle.xml',
 	'input-method-unstable-v2.xml',
 	'screenshooter.xml',
diff --git a/rootston/cursor.c b/rootston/cursor.c
index b9ded30e..1fdf1dbb 100644
--- a/rootston/cursor.c
+++ b/rootston/cursor.c
@@ -305,11 +305,41 @@ static void roots_cursor_press_button(struct roots_cursor *cursor,
 	}
 }
 
+static void notify_relative_motion(struct roots_seat *seat, uint64_t time_msec,
+		double dx, double dy, double dx_unaccel, double dy_unaccel) {
+	struct wlr_relative_pointer_manager_v1 *relative_pointer_manager =
+		seat->input->server->desktop->relative_pointer_manager;
+
+	struct wlr_seat_client *client = seat->seat->pointer_state.focused_client;
+	if (client == NULL) {
+		return;
+	}
+
+	struct wlr_relative_pointer_v1 *pointer;
+	wl_list_for_each(pointer, &relative_pointer_manager->relative_pointers, link) {
+		struct wlr_seat_client *relative_pointer_client =
+			wlr_seat_client_from_pointer_resource(pointer->pointer);
+
+		if (seat->seat == pointer->seat &&
+				client == relative_pointer_client) {
+			wlr_relative_pointer_v1_send_relative_motion(pointer,
+					time_msec, dx, dy, dx_unaccel, dy_unaccel);
+		}
+
+	}
+}
+
 void roots_cursor_handle_motion(struct roots_cursor *cursor,
 		struct wlr_event_pointer_motion *event) {
 	double dx = event->delta_x;
 	double dy = event->delta_y;
 
+	double unaccel_dx = event->unaccel_dx;
+	double unaccel_dy = event->unaccel_dy;
+
+	notify_relative_motion(cursor->seat,
+		(uint64_t)event->time_msec * 1000, dx, dy, unaccel_dx, unaccel_dy);
+
 	if (cursor->active_constraint) {
 		struct roots_view *view = cursor->pointer_view->view;
 		assert(view);
@@ -349,6 +379,12 @@ void roots_cursor_handle_motion_absolute(struct roots_cursor *cursor,
 	wlr_cursor_absolute_to_layout_coords(cursor->cursor, event->device, event->x,
 		event->y, &lx, &ly);
 
+	double dx = lx - cursor->cursor->x;
+	double dy = ly - cursor->cursor->y;
+
+	notify_relative_motion(cursor->seat,
+		(uint64_t)event->time_msec * 1000, dx, dy, dx, dy);
+
 	if (cursor->pointer_view) {
 		struct roots_view *view = cursor->pointer_view->view;
 
diff --git a/rootston/desktop.c b/rootston/desktop.c
index 48e2635c..77a52571 100644
--- a/rootston/desktop.c
+++ b/rootston/desktop.c
@@ -1081,6 +1081,8 @@ struct roots_desktop *desktop_create(struct roots_server *server,
 		wlr_presentation_create(server->wl_display, server->backend);
 	desktop->foreign_toplevel_manager_v1 =
 		wlr_foreign_toplevel_manager_v1_create(server->wl_display);
+	desktop->relative_pointer_manager =
+		wlr_relative_pointer_manager_v1_create(server->wl_display);
 
 	return desktop;
 }
diff --git a/types/meson.build b/types/meson.build
index 1813b144..982f607d 100644
--- a/types/meson.build
+++ b/types/meson.build
@@ -51,6 +51,7 @@ lib_wlr_types = static_library(
 		'wlr_primary_selection.c',
 		'wlr_region.c',
 		'wlr_screencopy_v1.c',
+		'wlr_relative_pointer_v1.c',
 		'wlr_screenshooter.c',
 		'wlr_server_decoration.c',
 		'wlr_surface.c',
diff --git a/types/wlr_relative_pointer_v1.c b/types/wlr_relative_pointer_v1.c
new file mode 100644
index 00000000..a6e6e4b3
--- /dev/null
+++ b/types/wlr_relative_pointer_v1.c
@@ -0,0 +1,263 @@
+#include <stdlib.h>
+#include <assert.h>
+#include <inttypes.h>
+#include <wlr/util/log.h>
+#include <util/signal.h>
+#include <wlr/types/wlr_relative_pointer_v1.h>
+#include <wlr/types/wlr_seat.h>
+#include "wayland-util.h"
+#include "wayland-server.h"
+#include "relative-pointer-unstable-v1-protocol.h"
+
+#define RELATIVE_POINTER_MANAGER_VERSION 1
+
+static const struct zwp_relative_pointer_manager_v1_interface relative_pointer_manager_v1_impl;
+static const struct zwp_relative_pointer_v1_interface relative_pointer_v1_impl;
+
+
+/**
+ * helper functions
+ */
+
+struct wlr_relative_pointer_v1 *wlr_relative_pointer_v1_from_resource(struct wl_resource *resource) {
+	assert(wl_resource_instance_of(resource, &zwp_relative_pointer_v1_interface,
+		&relative_pointer_v1_impl));
+	return wl_resource_get_user_data(resource);
+}
+
+
+static struct wlr_relative_pointer_manager_v1 *relative_pointer_manager_from_resource(struct wl_resource *resource) {
+	assert(wl_resource_instance_of(resource, &zwp_relative_pointer_manager_v1_interface,
+		&relative_pointer_manager_v1_impl));
+	return wl_resource_get_user_data(resource);
+}
+
+
+/**
+ * relative_pointer handler functions
+ */
+
+static void relative_pointer_destroy(struct wlr_relative_pointer_v1 *relative_pointer) {
+	wlr_signal_emit_safe(&relative_pointer->events.destroy, relative_pointer);
+
+	wl_list_remove(&relative_pointer->link);
+	wl_list_remove(&relative_pointer->seat_destroy.link);
+
+	wl_resource_set_user_data(relative_pointer->resource, NULL);
+	free(relative_pointer);
+}
+
+static void relative_pointer_v1_handle_resource_destroy(struct wl_resource *resource) {
+	struct wlr_relative_pointer_v1 *relative_pointer =
+		wlr_relative_pointer_v1_from_resource(resource);
+	if (relative_pointer == NULL) {
+		return;
+	}
+	relative_pointer_destroy(relative_pointer);
+}
+
+
+static void relative_pointer_v1_handle_destroy(struct wl_client *client,
+		struct wl_resource *resource) {
+	struct wlr_relative_pointer_v1 *relative_pointer =
+		wlr_relative_pointer_v1_from_resource(resource);
+	wlr_log(WLR_DEBUG, "relative_pointer_v1 %p released by client %p",
+		relative_pointer, client);
+
+	wl_resource_destroy(resource);
+}
+
+static void relative_pointer_handle_seat_destroy(struct wl_listener *listener,
+		void *data) {
+	struct wlr_relative_pointer_v1 *relative_pointer =
+		wl_container_of(listener, relative_pointer, seat_destroy);
+
+	relative_pointer_destroy(relative_pointer);
+}
+
+static void relative_pointer_handle_pointer_destroy(struct wl_listener *listener,
+		void *data) {
+	struct wlr_relative_pointer_v1 *relative_pointer =
+		wl_container_of(listener, relative_pointer, pointer_destroy);
+
+	relative_pointer_destroy(relative_pointer);
+}
+
+/**
+ * relative_pointer_manager handler functions
+ */
+
+static void relative_pointer_manager_v1_handle_resource_destroy(struct wl_resource *resource) {
+	wl_list_remove(wl_resource_get_link(resource));
+}
+
+
+static void relative_pointer_manager_v1_handle_destroy(struct wl_client *client,
+		struct wl_resource *resource) {
+	wl_resource_destroy(resource);
+
+	wlr_log(WLR_DEBUG, "relative_pointer_v1 manager unbound from client %p",
+		client);
+}
+
+static void relative_pointer_manager_v1_handle_get_relative_pointer(struct wl_client *client,
+		struct wl_resource *resource, uint32_t id, struct wl_resource *pointer) {
+	struct wlr_seat_client *seat_client =
+		wlr_seat_client_from_pointer_resource(pointer);
+
+	struct wlr_relative_pointer_v1 *relative_pointer =
+		calloc(1, sizeof(struct wlr_relative_pointer_v1));
+	if (relative_pointer == NULL) {
+		wl_client_post_no_memory(client);
+		return;
+	}
+
+	struct wl_resource *relative_pointer_resource = wl_resource_create(client,
+		&zwp_relative_pointer_v1_interface, wl_resource_get_version(resource), id);
+	if (relative_pointer_resource == NULL) {
+		free(relative_pointer);
+		wl_client_post_no_memory(client);
+		return;
+	}
+
+	relative_pointer->resource = relative_pointer_resource;
+	relative_pointer->seat = seat_client->seat;
+	relative_pointer->pointer = pointer;
+
+	wl_signal_init(&relative_pointer->events.destroy);
+
+	wl_resource_set_implementation(relative_pointer_resource, &relative_pointer_v1_impl,
+		relative_pointer, relative_pointer_v1_handle_resource_destroy);
+
+	struct wlr_relative_pointer_manager_v1 *manager =
+		relative_pointer_manager_from_resource(resource);
+
+	wl_list_insert(&manager->relative_pointers,
+			&relative_pointer->link);
+
+	wl_signal_add(&relative_pointer->seat->events.destroy,
+			&relative_pointer->seat_destroy);
+	relative_pointer->seat_destroy.notify = relative_pointer_handle_seat_destroy;
+
+	wl_resource_add_destroy_listener(relative_pointer->pointer,
+			&relative_pointer->pointer_destroy);
+	relative_pointer->pointer_destroy.notify = relative_pointer_handle_pointer_destroy;
+
+	wlr_signal_emit_safe(&manager->events.new_relative_pointer,
+		relative_pointer);
+
+	wlr_log(WLR_DEBUG, "relative_pointer_v1 %p created for client %p",
+		relative_pointer, client);
+}
+
+
+static void relative_pointer_manager_v1_bind(struct wl_client *wl_client, void *data,
+		uint32_t version, uint32_t id) {
+	struct wlr_relative_pointer_manager_v1 *manager = data;
+
+	struct wl_resource *manager_resource = wl_resource_create(wl_client,
+		&zwp_relative_pointer_manager_v1_interface, version, id);
+
+	if (manager_resource == NULL) {
+		wl_client_post_no_memory(wl_client);
+		return;
+	}
+
+	wl_list_insert(&manager->resources, wl_resource_get_link(manager_resource));
+
+	wl_resource_set_implementation(manager_resource, &relative_pointer_manager_v1_impl,
+		manager, relative_pointer_manager_v1_handle_resource_destroy);
+
+	wlr_log(WLR_DEBUG, "relative_pointer_v1 manager bound to client %p",
+		wl_client);
+}
+
+static void handle_display_destroy(struct wl_listener *listener, void *data) {
+	struct wlr_relative_pointer_manager_v1 *manager =
+		wl_container_of(listener, manager, display_destroy_listener);
+	wlr_relative_pointer_manager_v1_destroy(manager);
+}
+
+
+/**
+ * Implementations
+ */
+
+static const struct zwp_relative_pointer_manager_v1_interface relative_pointer_manager_v1_impl = {
+	.destroy = relative_pointer_manager_v1_handle_destroy,
+	.get_relative_pointer = relative_pointer_manager_v1_handle_get_relative_pointer,
+};
+
+
+static const struct zwp_relative_pointer_v1_interface relative_pointer_v1_impl = {
+	.destroy = relative_pointer_v1_handle_destroy,
+};
+
+
+/**
+ * Public functions
+ */
+
+struct wlr_relative_pointer_manager_v1 *wlr_relative_pointer_manager_v1_create(struct wl_display *display) {
+	struct wlr_relative_pointer_manager_v1 *manager =
+		calloc(1, sizeof(struct wlr_relative_pointer_manager_v1));
+
+	if (manager == NULL) {
+		return NULL;
+	}
+
+	wl_list_init(&manager->resources);
+	wl_list_init(&manager->relative_pointers);
+
+	manager->global = wl_global_create(display,
+		&zwp_relative_pointer_manager_v1_interface, RELATIVE_POINTER_MANAGER_VERSION,
+		manager, relative_pointer_manager_v1_bind);
+
+	if (manager->global == NULL) {
+		free(manager);
+		return NULL;
+	}
+
+	wl_signal_init(&manager->events.destroy);
+	wl_signal_init(&manager->events.new_relative_pointer);
+
+	manager->display_destroy_listener.notify = handle_display_destroy;
+	wl_display_add_destroy_listener(display, &manager->display_destroy_listener);
+
+	wlr_log(WLR_DEBUG, "relative_pointer_v1 manager created");
+
+	return manager;
+}
+
+
+void wlr_relative_pointer_manager_v1_destroy(struct wlr_relative_pointer_manager_v1 *manager) {
+	if (manager == NULL) {
+		return;
+	}
+
+	wlr_signal_emit_safe(&manager->events.destroy, manager);
+	wl_list_remove(&manager->display_destroy_listener.link);
+
+	struct wl_resource *resource;
+	struct wl_resource *tmp_resource;
+	wl_resource_for_each_safe(resource, tmp_resource, &manager->resources) {
+		wl_resource_destroy(resource);
+	}
+
+	wl_global_destroy(manager->global);
+	free(manager);
+
+	wlr_log(WLR_DEBUG, "relative_pointer_v1 manager destroyed");
+}
+
+
+void wlr_relative_pointer_v1_send_relative_motion(struct wlr_relative_pointer_v1 *relative_pointer,
+		uint64_t time_msec, double dx, double dy,
+		double dx_unaccel, double dy_unaccel) {
+	zwp_relative_pointer_v1_send_relative_motion(relative_pointer->resource,
+		(uint32_t)(time_msec >> 32), (uint32_t)time_msec,
+		wl_fixed_from_double(dx), wl_fixed_from_double(dy),
+		wl_fixed_from_double(dx_unaccel), wl_fixed_from_double(dy_unaccel));
+
+	wl_pointer_send_frame(relative_pointer->pointer);
+}