Add multi-pointer example

3 files changed, 215 insertions, 11 deletions

diff --git a/examples/meson.build b/examples/meson.build
index a29a3310..3402441b 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -8,6 +8,8 @@ executable('simple', 'simple.c', dependencies: wlroots, link_with: lib_shared)
 executable('pointer', 'pointer.c', dependencies: wlroots, link_with: lib_shared)
 executable('touch', 'touch.c', dependencies: wlroots, link_with: lib_shared)
 executable('tablet', 'tablet.c', dependencies: wlroots, link_with: lib_shared)
+executable('multi-pointer', 'multi-pointer.c', dependencies: wlroots,
+	link_with: lib_shared)
 
 executable(
 	'rotation',
diff --git a/examples/multi-pointer.c b/examples/multi-pointer.c
new file mode 100644
index 00000000..c3a02cc7
--- /dev/null
+++ b/examples/multi-pointer.c
@@ -0,0 +1,202 @@
+#define _POSIX_C_SOURCE 199309L
+#define _XOPEN_SOURCE 500
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <unistd.h>
+#include <math.h>
+#include <assert.h>
+#include <wayland-server.h>
+#include <wayland-server-protocol.h>
+#include <xkbcommon/xkbcommon.h>
+#include <GLES2/gl2.h>
+#include <wlr/render/matrix.h>
+#include <wlr/render/gles2.h>
+#include <wlr/render.h>
+#include <wlr/backend.h>
+#include <wlr/backend/session.h>
+#include <wlr/types/wlr_keyboard.h>
+#include <wlr/types/wlr_output_layout.h>
+#include <wlr/xcursor.h>
+#include <wlr/types/wlr_cursor.h>
+#include <wlr/util/log.h>
+#include <wlr/types/wlr_list.h>
+#include "shared.h"
+#include "config.h"
+#include "cat.h"
+
+struct sample_state;
+
+struct sample_cursor {
+	struct sample_state *state;
+	struct wlr_input_device *device;
+	struct wlr_cursor *cursor;
+	struct wl_list link;
+
+	struct wl_listener cursor_motion;
+	struct wl_listener cursor_motion_absolute;
+	struct wl_listener cursor_button;
+	struct wl_listener cursor_axis;
+};
+
+struct sample_state {
+	struct compositor_state *compositor;
+	struct example_config *config;
+	struct wlr_xcursor *xcursor;
+	float default_color[4];
+	float clear_color[4];
+	struct wlr_output_layout *layout;
+	struct wl_list cursors; // sample_cursor::link
+};
+
+static void handle_output_frame(struct output_state *output,
+		struct timespec *ts) {
+	struct compositor_state *state = output->compositor;
+	struct sample_state *sample = state->data;
+	struct wlr_output *wlr_output = output->output;
+
+	wlr_output_make_current(wlr_output);
+
+	glClearColor(sample->clear_color[0], sample->clear_color[1],
+		sample->clear_color[2], sample->clear_color[3]);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	wlr_output_swap_buffers(wlr_output);
+}
+
+static void handle_output_add(struct output_state *ostate) {
+	struct sample_state *sample = ostate->compositor->data;
+
+	struct output_config *o_config =
+		example_config_get_output(sample->config, ostate->output);
+
+	if (o_config) {
+		wlr_output_transform(ostate->output, o_config->transform);
+		wlr_output_layout_add(sample->layout, ostate->output, o_config->x,
+			o_config->y);
+	} else {
+		wlr_output_layout_add_auto(sample->layout, ostate->output);
+	}
+
+	struct sample_cursor *cursor;
+	wl_list_for_each(cursor, &sample->cursors, link) {
+		example_config_configure_cursor(sample->config, cursor->cursor,
+			sample->compositor);
+
+		// TODO the cursor must be set depending on which surface it is
+		// displayed over which should happen in the compositor.
+		struct wlr_xcursor_image *image = sample->xcursor->images[0];
+		wlr_cursor_set_image(cursor->cursor, image->buffer, image->width,
+			image->width, image->height, image->hotspot_x, image->hotspot_y);
+
+		wlr_cursor_warp(cursor->cursor, NULL, cursor->cursor->x,
+			cursor->cursor->y);
+	}
+}
+
+static void handle_output_remove(struct output_state *ostate) {
+	struct sample_state *sample = ostate->compositor->data;
+
+	wlr_output_layout_remove(sample->layout, ostate->output);
+
+	struct sample_cursor *cursor;
+	wl_list_for_each(cursor, &sample->cursors, link) {
+		example_config_configure_cursor(sample->config, cursor->cursor,
+			sample->compositor);
+	}
+}
+
+static void handle_cursor_motion(struct wl_listener *listener, void *data) {
+	struct sample_cursor *cursor =
+		wl_container_of(listener, cursor, cursor_motion);
+	struct wlr_event_pointer_motion *event = data;
+	wlr_cursor_move(cursor->cursor, event->device, event->delta_x,
+		event->delta_y);
+}
+
+static void handle_cursor_motion_absolute(struct wl_listener *listener,
+		void *data) {
+	struct sample_cursor *cursor =
+		wl_container_of(listener, cursor, cursor_motion_absolute);
+	struct wlr_event_pointer_motion_absolute *event = data;
+	wlr_cursor_warp_absolute(cursor->cursor, event->device,
+		event->x_mm / event->width_mm, event->y_mm / event->height_mm);
+}
+
+static void handle_input_add(struct compositor_state *state,
+		struct wlr_input_device *device) {
+	struct sample_state *sample = state->data;
+
+	if (device->type != WLR_INPUT_DEVICE_POINTER) {
+		return;
+	}
+
+	struct sample_cursor *cursor = calloc(1, sizeof(struct sample_cursor));
+	cursor->state = sample;
+
+	cursor->cursor = wlr_cursor_create();
+	wlr_cursor_attach_output_layout(cursor->cursor, sample->layout);
+	wlr_cursor_map_to_region(cursor->cursor, sample->config->cursor.mapped_box);
+
+	wl_signal_add(&cursor->cursor->events.motion, &cursor->cursor_motion);
+	cursor->cursor_motion.notify = handle_cursor_motion;
+	wl_signal_add(&cursor->cursor->events.motion_absolute,
+		&cursor->cursor_motion_absolute);
+	cursor->cursor_motion_absolute.notify = handle_cursor_motion_absolute;
+
+	wlr_cursor_attach_input_device(cursor->cursor, device);
+	example_config_configure_cursor(sample->config, cursor->cursor,
+		sample->compositor);
+
+	struct wlr_xcursor_image *image = sample->xcursor->images[0];
+	wlr_cursor_set_image(cursor->cursor, image->buffer, image->width,
+		image->width, image->height, image->hotspot_x, image->hotspot_y);
+
+	wl_list_insert(&sample->cursors, &cursor->link);
+}
+
+int main(int argc, char *argv[]) {
+	struct sample_state state = {
+		.default_color = { 0.25f, 0.25f, 0.25f, 1 },
+		.clear_color = { 0.25f, 0.25f, 0.25f, 1 },
+	};
+
+	wl_list_init(&state.cursors);
+
+	state.config = parse_args(argc, argv);
+	state.layout = wlr_output_layout_create();
+
+	struct compositor_state compositor = { 0 };
+	compositor.data = &state;
+	compositor.output_add_cb = handle_output_add;
+	compositor.output_remove_cb = handle_output_remove;
+	compositor.output_frame_cb = handle_output_frame;
+	compositor.input_add_cb = handle_input_add;
+
+	state.compositor = &compositor;
+
+	struct wlr_xcursor_theme *theme = wlr_xcursor_theme_load("default", 16);
+	if (!theme) {
+		wlr_log(L_ERROR, "Failed to load cursor theme");
+		return 1;
+	}
+	state.xcursor = wlr_xcursor_theme_get_cursor(theme, "left_ptr");
+	if (!state.xcursor) {
+		wlr_log(L_ERROR, "Failed to load left_ptr cursor");
+		return 1;
+	}
+
+	compositor_init(&compositor);
+	if (!wlr_backend_start(compositor.backend)) {
+		wlr_log(L_ERROR, "Failed to start backend");
+		wlr_backend_destroy(compositor.backend);
+		exit(1);
+	}
+	wl_display_run(compositor.display);
+	compositor_fini(&compositor);
+
+	wlr_xcursor_theme_destroy(theme);
+	example_config_destroy(state.config);
+	wlr_output_layout_destroy(state.layout);
+}
diff --git a/examples/pointer.c b/examples/pointer.c
index 77f5192f..83122421 100644
--- a/examples/pointer.c
+++ b/examples/pointer.c
@@ -60,7 +60,7 @@ struct touch_point {
 };
 
 static void warp_to_touch(struct sample_state *sample,
-        struct wlr_input_device *dev) {
+		struct wlr_input_device *dev) {
 	if (sample->touch_points->length == 0) {
 		return;
 	}
@@ -77,7 +77,7 @@ static void warp_to_touch(struct sample_state *sample,
 }
 
 static void handle_output_frame(struct output_state *output,
-        struct timespec *ts) {
+		struct timespec *ts) {
 	struct compositor_state *state = output->compositor;
 	struct sample_state *sample = state->data;
 	struct wlr_output *wlr_output = output->output;
@@ -127,7 +127,7 @@ static void handle_output_remove(struct output_state *ostate) {
 }
 
 static void handle_input_add(struct compositor_state *state,
-        struct wlr_input_device *device) {
+		struct wlr_input_device *device) {
 	struct sample_state *sample = state->data;
 
 	if (device->type == WLR_INPUT_DEVICE_POINTER ||
@@ -141,16 +141,16 @@ static void handle_input_add(struct compositor_state *state,
 
 static void handle_cursor_motion(struct wl_listener *listener, void *data) {
 	struct sample_state *sample =
-        wl_container_of(listener, sample, cursor_motion);
+		wl_container_of(listener, sample, cursor_motion);
 	struct wlr_event_pointer_motion *event = data;
 	wlr_cursor_move(sample->cursor, event->device, event->delta_x,
-        event->delta_y);
+			event->delta_y);
 }
 
 static void handle_cursor_motion_absolute(struct wl_listener *listener,
-        void *data) {
+		void *data) {
 	struct sample_state *sample =
-        wl_container_of(listener, sample, cursor_motion_absolute);
+		wl_container_of(listener, sample, cursor_motion_absolute);
 	struct wlr_event_pointer_motion_absolute *event = data;
 
 	sample->cur_x = event->x_mm;
@@ -162,7 +162,7 @@ static void handle_cursor_motion_absolute(struct wl_listener *listener,
 
 static void handle_cursor_button(struct wl_listener *listener, void *data) {
 	struct sample_state *sample =
-        wl_container_of(listener, sample, cursor_button);
+		wl_container_of(listener, sample, cursor_button);
 	struct wlr_event_pointer_button *event = data;
 
 	float (*color)[4];
@@ -179,7 +179,7 @@ static void handle_cursor_button(struct wl_listener *listener, void *data) {
 
 static void handle_cursor_axis(struct wl_listener *listener, void *data) {
 	struct sample_state *sample =
-        wl_container_of(listener, sample, cursor_axis);
+		wl_container_of(listener, sample, cursor_axis);
 	struct wlr_event_pointer_axis *event = data;
 
 	for (size_t i = 0; i < 3; ++i) {
@@ -226,7 +226,7 @@ static void handle_touch_down(struct wl_listener *listener, void *data) {
 
 static void handle_touch_motion(struct wl_listener *listener, void *data) {
 	struct sample_state *sample =
-        wl_container_of(listener, sample, touch_motion);
+		wl_container_of(listener, sample, touch_motion);
 	struct wlr_event_touch_motion *event = data;
 	for (size_t i = 0; i < sample->touch_points->length; ++i) {
 		struct touch_point *point = sample->touch_points->items[i];
@@ -246,7 +246,7 @@ static void handle_touch_cancel(struct wl_listener *listener, void *data) {
 
 static void handle_tablet_tool_axis(struct wl_listener *listener, void *data) {
 	struct sample_state *sample =
-        wl_container_of(listener, sample, tablet_tool_axis);
+		wl_container_of(listener, sample, tablet_tool_axis);
 	struct wlr_event_tablet_tool_axis *event = data;
 	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_X) &&
 			(event->updated_axes & WLR_TABLET_TOOL_AXIS_Y)) {