Merge branch 'wlcore'

examples/CMakeLists.txt

@@ -0,0 +1,81 @@
+include_directories(
+	${DRM_INCLUDE_DIRS}
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    ${XKBCOMMON_INCLUDE_DIRS}
+)
+
+add_executable(simple
+    simple.c
+    shared.c
+)
+
+target_link_libraries(simple
+    wlr-backend
+    wlr-session
+    ${XKBCOMMON_LIBRARIES}
+)
+
+add_executable(rotation
+    rotation.c
+    shared.c
+    cat.c
+)
+
+target_link_libraries(rotation
+    wlr-backend
+    wlr-session
+    wlr-render
+    ${XKBCOMMON_LIBRARIES}
+)
+
+add_executable(pointer
+    pointer.c
+    shared.c
+    cat.c
+)
+
+target_link_libraries(pointer
+    wlr-backend
+    wlr-session
+    wlr-render
+    ${XKBCOMMON_LIBRARIES}
+)
+
+add_executable(touch
+    touch.c
+    shared.c
+    cat.c
+)
+
+target_link_libraries(touch
+    wlr-backend
+    wlr-session
+    wlr-render
+    ${XKBCOMMON_LIBRARIES}
+)
+
+add_executable(tablet
+    tablet.c
+    shared.c
+)
+
+target_link_libraries(tablet
+    wlr-backend
+    wlr-session
+    wlr-render
+    ${XKBCOMMON_LIBRARIES}
+)
+
+add_executable(compositor
+    compositor/main.c
+    compositor/wl_compositor.c
+    compositor/wl_shell.c
+    shared.c
+)
+
+target_link_libraries(compositor
+    wlr-backend
+    wlr-session
+    wlr-render
+    ${XKBCOMMON_LIBRARIES}
+)

examples/cat.h

@@ -0,0 +1,13 @@
+#ifndef _CAT_H
+#define _CAT_H
+
+struct gimp_texture {
+  unsigned int 	 width;
+  unsigned int 	 height;
+  unsigned int 	 bytes_per_pixel; /* 2:RGB16, 3:RGB, 4:RGBA */ 
+  unsigned char	 pixel_data[128 * 128 * 3 + 1];
+};
+
+extern const struct gimp_texture cat_tex;
+
+#endif

examples/compositor.h

@@ -0,0 +1,21 @@
+#ifndef _EXAMPLE_COMPOSITOR_H
+#define _EXAMPLE_COMPOSITOR_H
+#include <wayland-server.h>
+
+struct wl_compositor_state {
+	struct wl_global *wl_global;
+	struct wl_list wl_resources;
+};
+
+void wl_compositor_init(struct wl_display *display,
+		struct wl_compositor_state *state);
+
+struct wl_shell_state {
+	struct wl_global *wl_global;
+	struct wl_list wl_resources;
+};
+
+void wl_shell_init(struct wl_display *display,
+		struct wl_shell_state *state);
+
+#endif

examples/compositor/main.c

@@ -0,0 +1,49 @@
+#define _POSIX_C_SOURCE 199309L
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <inttypes.h>
+#include <wayland-server.h>
+#include <wlr/backend.h>
+#include <wlr/session.h>
+#include <wlr/render.h>
+#include <wlr/render/gles2.h>
+#include <wlr/types/wlr_output.h>
+#include <xkbcommon/xkbcommon.h>
+#include "shared.h"
+#include "compositor.h"
+
+struct sample_state {
+	struct wlr_renderer *renderer;
+	struct wl_compositor_state compositor;
+	struct wl_shell_state shell;
+};
+
+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);
+	wlr_renderer_begin(sample->renderer, wlr_output);
+	// TODO: render surfaces
+	wlr_renderer_end(sample->renderer);
+	wlr_output_swap_buffers(wlr_output);
+}
+
+int main() {
+	struct sample_state state = { 0 };
+	struct compositor_state compositor = { 0,
+		.data = &state,
+		.output_frame_cb = handle_output_frame,
+	};
+	compositor_init(&compositor);
+
+	state.renderer = wlr_gles2_renderer_init();
+	wl_display_init_shm(compositor.display);
+	wl_compositor_init(compositor.display, &state.compositor);
+	wl_shell_init(compositor.display, &state.shell);
+
+	compositor_run(&compositor);
+}

examples/compositor/wl_compositor.c

@@ -0,0 +1,55 @@
+#include <assert.h>
+#include <wayland-server.h>
+#include <wlr/util/log.h>
+#include "compositor.h"
+
+static void wl_compositor_create_surface(struct wl_client *client,
+			   struct wl_resource *resource, uint32_t id) {
+	wlr_log(L_DEBUG, "TODO: implement create_surface");
+}
+
+static void wl_compositor_create_region(struct wl_client *client,
+			  struct wl_resource *resource, uint32_t id) {
+	wlr_log(L_DEBUG, "TODO: implement create_region");
+}
+
+struct wl_compositor_interface wl_compositor_impl = {
+	.create_surface = wl_compositor_create_surface,
+	.create_region = wl_compositor_create_region
+};
+
+static void wl_compositor_destroy(struct wl_resource *resource) {
+	struct wl_compositor_state *state = wl_resource_get_user_data(resource);
+	struct wl_resource *_resource = NULL;
+	wl_resource_for_each(_resource, &state->wl_resources) {
+		if (_resource == resource) {
+			struct wl_list *link = wl_resource_get_link(_resource);
+			wl_list_remove(link);
+			break;
+		}
+	}
+}
+
+static void wl_compositor_bind(struct wl_client *wl_client, void *_state,
+		uint32_t version, uint32_t id) {
+	struct wl_compositor_state *state = _state;
+	assert(wl_client && state);
+	if (version > 4) {
+		wlr_log(L_ERROR, "Client requested unsupported wl_compositor version, disconnecting");
+		wl_client_destroy(wl_client);
+		return;
+	}
+	struct wl_resource *wl_resource = wl_resource_create(
+			wl_client, &wl_compositor_interface, version, id);
+	wl_resource_set_implementation(wl_resource, &wl_compositor_impl,
+			state, wl_compositor_destroy);
+	wl_list_insert(&state->wl_resources, wl_resource_get_link(wl_resource));
+}
+
+void wl_compositor_init(struct wl_display *display,
+		struct wl_compositor_state *state) {
+	struct wl_global *wl_global = wl_global_create(display,
+		&wl_compositor_interface, 4, state, wl_compositor_bind);
+	state->wl_global = wl_global;
+	wl_list_init(&state->wl_resources);
+}

examples/compositor/wl_shell.c

@@ -0,0 +1,50 @@
+#include <assert.h>
+#include <wayland-server.h>
+#include <wlr/util/log.h>
+#include "compositor.h"
+
+void wl_shell_get_shell_surface(struct wl_client *client,
+				  struct wl_resource *resource, uint32_t id,
+				  struct wl_resource *surface) {
+	wlr_log(L_DEBUG, "TODO: implement get_shell_surface");
+}
+
+static struct wl_shell_interface wl_shell_impl = {
+	.get_shell_surface = wl_shell_get_shell_surface
+};
+
+static void wl_shell_destroy(struct wl_resource *resource) {
+	struct wl_shell_state *state = wl_resource_get_user_data(resource);
+	struct wl_resource *_resource = NULL;
+	wl_resource_for_each(_resource, &state->wl_resources) {
+		if (_resource == resource) {
+			struct wl_list *link = wl_resource_get_link(_resource);
+			wl_list_remove(link);
+			break;
+		}
+	}
+}
+
+static void wl_shell_bind(struct wl_client *wl_client, void *_state,
+		uint32_t version, uint32_t id) {
+	struct wl_shell_state *state = _state;
+	assert(wl_client && state);
+	if (version > 1) {
+		wlr_log(L_ERROR, "Client requested unsupported wl_shell version, disconnecting");
+		wl_client_destroy(wl_client);
+		return;
+	}
+	struct wl_resource *wl_resource = wl_resource_create(
+			wl_client, &wl_shell_interface, version, id);
+	wl_resource_set_implementation(wl_resource, &wl_shell_impl,
+			state, wl_shell_destroy);
+	wl_list_insert(&state->wl_resources, wl_resource_get_link(wl_resource));
+}
+
+void wl_shell_init(struct wl_display *display,
+		struct wl_shell_state *state) {
+	struct wl_global *wl_global = wl_global_create(display,
+		&wl_shell_interface, 1, state, wl_shell_bind);
+	state->wl_global = wl_global;
+	wl_list_init(&state->wl_resources);
+}

examples/pointer.c

@@ -0,0 +1,127 @@
+#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 <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/session.h>
+#include <wlr/types/wlr_keyboard.h>
+#include <wlr/util/log.h>
+#include "shared.h"
+#include "cat.h"
+
+struct sample_state {
+	double cur_x, cur_y;
+	float default_color[4];
+	float clear_color[4];
+};
+
+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_pointer_motion(struct pointer_state *pstate,
+		double d_x, double d_y) {
+	struct sample_state *state = pstate->compositor->data;
+	state->cur_x += d_x;
+	state->cur_y += d_y;
+
+	struct output_state *output;
+	wl_list_for_each(output, &pstate->compositor->outputs, link) {
+		wlr_output_move_cursor(output->output, state->cur_x, state->cur_y);
+	}
+}
+
+static void handle_pointer_motion_absolute(struct pointer_state *pstate,
+		double x, double y) {
+	struct sample_state *state = pstate->compositor->data;
+	state->cur_x = x;
+	state->cur_y = y;
+
+	struct output_state *output;
+	wl_list_for_each(output, &pstate->compositor->outputs, link) {
+		wlr_output_move_cursor(output->output, state->cur_x, state->cur_y);
+	}
+}
+
+static void handle_pointer_button(struct pointer_state *pstate,
+		uint32_t button, enum wlr_button_state state) {
+	struct sample_state *sample = pstate->compositor->data;
+	float (*color)[4];
+	if (state == WLR_BUTTON_RELEASED) {
+		color = &sample->default_color;
+	} else {
+		float red[4] = { 0.25f, 0.25f, 0.25f, 1 };
+		red[button % 3] = 1;
+		color = &red;
+	}
+	memcpy(&sample->clear_color, color, sizeof(*color));
+}
+
+static void handle_pointer_axis(struct pointer_state *pstate,
+	enum wlr_axis_source source,
+	enum wlr_axis_orientation orientation,
+	double delta) {
+	struct sample_state *sample = pstate->compositor->data;
+	for (size_t i = 0; i < 3; ++i) {
+		sample->default_color[i] += delta > 0 ? -0.05f : 0.05f;
+		if (sample->default_color[i] > 1.0f) {
+			sample->default_color[i] = 1.0f;
+		}
+		if (sample->default_color[i] < 0.0f) {
+			sample->default_color[i] = 0.0f;
+		}
+	}
+	memcpy(&sample->clear_color, &sample->default_color,
+			sizeof(sample->clear_color));
+}
+
+static void handle_output_add(struct output_state *ostate) {
+	struct wlr_output *wlr_output = ostate->output;
+	if (!wlr_output_set_cursor(wlr_output, cat_tex.pixel_data,
+			cat_tex.width, cat_tex.width, cat_tex.height)) {
+		wlr_log(L_DEBUG, "Failed to set hardware cursor");
+		return;
+	}
+	if (!wlr_output_move_cursor(wlr_output, 0, 0)) {
+		wlr_log(L_DEBUG, "Failed to move hardware cursor");
+	}
+}
+
+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 }
+	};
+	struct compositor_state compositor = { 0 };
+	compositor.data = &state;
+	compositor.output_add_cb = handle_output_add;
+	compositor.output_frame_cb = handle_output_frame;
+	compositor.pointer_motion_cb = handle_pointer_motion;
+	compositor.pointer_motion_absolute_cb = handle_pointer_motion_absolute;
+	compositor.pointer_button_cb = handle_pointer_button;
+	compositor.pointer_axis_cb = handle_pointer_axis;
+	compositor_init(&compositor);
+
+	compositor_run(&compositor);
+}

examples/rotation.c

@@ -0,0 +1,221 @@
+#define _POSIX_C_SOURCE 199309L
+#define _XOPEN_SOURCE 500
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <strings.h>
+#include <unistd.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/session.h>
+#include <wlr/types/wlr_keyboard.h>
+#include <math.h>
+#include "shared.h"
+#include "cat.h"
+
+struct sample_state {
+	struct wl_list config;
+	struct wlr_renderer *renderer;
+	struct wlr_surface *cat_texture;
+};
+
+struct output_data {
+	float x_offs, y_offs;
+	float x_vel, y_vel;
+};
+
+struct output_config {
+	char *name;
+	enum wl_output_transform transform;
+	struct wl_list 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 output_data *odata = output->data;
+	struct wlr_output *wlr_output = output->output;
+
+	int32_t width, height;
+	wlr_output_effective_resolution(wlr_output, &width, &height);
+
+	wlr_output_make_current(wlr_output);
+	wlr_renderer_begin(sample->renderer, wlr_output);
+
+	float matrix[16];
+	for (int y = -128 + (int)odata->y_offs; y < height; y += 128) {
+		for (int x = -128 + (int)odata->x_offs; x < width; x += 128) {
+			wlr_surface_get_matrix(sample->cat_texture, &matrix,
+				&wlr_output->transform_matrix, x, y);
+			wlr_render_with_matrix(sample->renderer,
+					sample->cat_texture, &matrix);
+		}
+	}
+
+	wlr_renderer_end(sample->renderer);
+	wlr_output_swap_buffers(wlr_output);
+
+	long ms = (ts->tv_sec - output->last_frame.tv_sec) * 1000 +
+		(ts->tv_nsec - output->last_frame.tv_nsec) / 1000000;
+	float seconds = ms / 1000.0f;
+
+	odata->x_offs += odata->x_vel * seconds;
+	odata->y_offs += odata->y_vel * seconds;
+	if (odata->x_offs > 128) odata->x_offs = 0;
+	if (odata->y_offs > 128) odata->y_offs = 0;
+}
+
+static void handle_output_add(struct output_state *output) {
+	struct output_data *odata = calloc(1, sizeof(struct output_data));
+	odata->x_offs = odata->y_offs = 0;
+	odata->x_vel = odata->y_vel = 128;
+	output->data = odata;
+	struct sample_state *state = output->compositor->data;
+
+	struct output_config *conf;
+	wl_list_for_each(conf, &state->config, link) {
+		if (strcmp(conf->name, output->output->name) == 0) {
+			wlr_output_transform(output->output, conf->transform);
+			break;
+		}
+	}
+}
+
+static void handle_output_remove(struct output_state *output) {
+	free(output->data);
+}
+
+static void update_velocities(struct compositor_state *state,
+		float x_diff, float y_diff) {
+	struct output_state *output;
+	wl_list_for_each(output, &state->outputs, link) {
+		struct output_data *odata = output->data;
+		odata->x_vel += x_diff;
+		odata->y_vel += y_diff;
+	}
+}
+
+static void handle_keyboard_key(struct keyboard_state *kbstate,
+		xkb_keysym_t sym, enum wlr_key_state key_state) {
+	// NOTE: It may be better to simply refer to our key state during each frame
+	// and make this change in pixels/sec^2
+	// Also, key repeat
+	if (key_state == WLR_KEY_PRESSED) {
+		switch (sym) {
+		case XKB_KEY_Left:
+			update_velocities(kbstate->compositor, -16, 0);
+			break;
+		case XKB_KEY_Right:
+			update_velocities(kbstate->compositor, 16, 0);
+			break;
+		case XKB_KEY_Up:
+			update_velocities(kbstate->compositor, 0, -16);
+			break;
+		case XKB_KEY_Down:
+			update_velocities(kbstate->compositor, 0, 16);
+			break;
+		}
+	}
+}
+
+static void usage(const char *name, int ret) {
+	fprintf(stderr,
+		"usage: %s [-d <name> [-r <rotation> | -f]]*\n"
+		"\n"
+		" -o <output>    The name of the DRM display. e.g. DVI-I-1.\n"
+		" -r <rotation>  The rotation counter clockwise. Valid values are 90, 180, 270.\n"
+		" -f             Flip the output along the vertical axis.\n", name);
+
+	exit(ret);
+}
+
+static void parse_args(int argc, char *argv[], struct wl_list *config) {
+	struct output_config *oc = NULL;
+
+	int c;
+	while ((c = getopt(argc, argv, "o:r:fh")) != -1) {
+		switch (c) {
+		case 'o':
+			oc = calloc(1, sizeof(*oc));
+			oc->name = optarg;
+			oc->transform = WL_OUTPUT_TRANSFORM_NORMAL;
+			wl_list_insert(config, &oc->link);
+			break;
+		case 'r':
+			if (!oc) {
+				fprintf(stderr, "You must specify an output first\n");
+				usage(argv[0], 1);
+			}
+
+			if (oc->transform != WL_OUTPUT_TRANSFORM_NORMAL
+					&& oc->transform != WL_OUTPUT_TRANSFORM_FLIPPED) {
+				fprintf(stderr, "Rotation for %s already specified\n", oc->name);
+				usage(argv[0], 1);
+			}
+
+			if (strcmp(optarg, "90") == 0) {
+				oc->transform += WL_OUTPUT_TRANSFORM_90;
+			} else if (strcmp(optarg, "180") == 0) {
+				oc->transform += WL_OUTPUT_TRANSFORM_180;
+			} else if (strcmp(optarg, "270") == 0) {
+				oc->transform += WL_OUTPUT_TRANSFORM_270;
+			} else {
+				fprintf(stderr, "Invalid rotation '%s'\n", optarg);
+				usage(argv[0], 1);
+			}
+			break;
+		case 'f':
+			if (!oc) {
+				fprintf(stderr, "You must specify an output first\n");
+				usage(argv[0], 1);
+			}
+
+			if (oc->transform >= WL_OUTPUT_TRANSFORM_FLIPPED) {
+				fprintf(stderr, "Flip for %s already specified\n", oc->name);
+				usage(argv[0], 1);
+			}
+
+			oc->transform += WL_OUTPUT_TRANSFORM_FLIPPED;
+			break;
+		case 'h':
+		case '?':
+			usage(argv[0], c != 'h');
+		}
+	}
+}
+
+int main(int argc, char *argv[]) {
+	struct sample_state state = { 0 };
+	wl_list_init(&state.config);
+	parse_args(argc, argv, &state.config);
+
+	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.keyboard_key_cb = handle_keyboard_key;
+	compositor_init(&compositor);
+
+	state.renderer = wlr_gles2_renderer_init();
+	state.cat_texture = wlr_render_surface_init(state.renderer);
+	wlr_surface_attach_pixels(state.cat_texture, WL_SHM_FORMAT_ABGR8888,
+		cat_tex.width, cat_tex.width, cat_tex.height, cat_tex.pixel_data);
+
+	compositor_run(&compositor);
+
+	wlr_surface_destroy(state.cat_texture);
+	wlr_renderer_destroy(state.renderer);
+
+	struct output_config *ptr, *tmp;
+	wl_list_for_each_safe(ptr, tmp, &state.config, link) {
+		free(ptr);
+	}
+}

examples/shared.c

@@ -0,0 +1,493 @@
+#define _POSIX_C_SOURCE 200112L
+#include <string.h>
+#include <stdlib.h>
+#include <time.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <xkbcommon/xkbcommon.h>
+#include <wayland-server-protocol.h>
+#include <wlr/backend.h>
+#include <wlr/session.h>
+#include <wlr/types/wlr_output.h>
+#include <wlr/types/wlr_input_device.h>
+#include <wlr/util/log.h>
+#include "shared.h"
+
+static void keyboard_led_update(struct keyboard_state *kbstate) {
+	uint32_t leds = 0;
+	for (uint32_t i = 0; i < WLR_LED_LAST; ++i) {
+		if (xkb_state_led_index_is_active(kbstate->xkb_state, kbstate->leds[i])) {
+			leds |= (1 << i);
+		}
+	}
+	wlr_keyboard_led_update(kbstate->device->keyboard, leds);
+}
+
+static void keyboard_key_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_keyboard_key *event = data;
+	struct keyboard_state *kbstate = wl_container_of(listener, kbstate, key);
+	uint32_t keycode = event->keycode + 8;
+	enum wlr_key_state key_state = event->state;
+	const xkb_keysym_t *syms;
+	int nsyms = xkb_state_key_get_syms(kbstate->xkb_state, keycode, &syms);
+	for (int i = 0; i < nsyms; ++i) {
+		xkb_keysym_t sym = syms[i];
+		char name[64];
+		int l = xkb_keysym_get_name(sym, name, sizeof(name));
+		if (l != -1 && l != sizeof(name)) {
+			wlr_log(L_DEBUG, "Key event: %s %s", name,
+					key_state == WLR_KEY_PRESSED ? "pressed" : "released");
+		}
+		if (kbstate->compositor->keyboard_key_cb) {
+			kbstate->compositor->keyboard_key_cb(kbstate, sym, key_state);
+		}
+		if (sym == XKB_KEY_Escape) {
+			wl_display_terminate(kbstate->compositor->display);
+		} else if (key_state == WLR_KEY_PRESSED && sym >= XKB_KEY_F1 && sym <= XKB_KEY_F12) {
+			wlr_session_change_vt(kbstate->compositor->session, sym - XKB_KEY_F1 + 1);
+		}
+	}
+	xkb_state_update_key(kbstate->xkb_state, keycode,
+		event->state == WLR_KEY_PRESSED ?  XKB_KEY_DOWN : XKB_KEY_UP);
+	keyboard_led_update(kbstate);
+}
+
+static void keyboard_add(struct wlr_input_device *device, struct compositor_state *state) {
+	struct keyboard_state *kbstate = calloc(sizeof(struct keyboard_state), 1);
+	kbstate->device = device;
+	kbstate->compositor = state;
+	wl_list_init(&kbstate->key.link);
+	kbstate->key.notify = keyboard_key_notify;
+	wl_signal_add(&device->keyboard->events.key, &kbstate->key);
+	wl_list_insert(&state->keyboards, &kbstate->link);
+
+	struct xkb_rule_names rules;
+	memset(&rules, 0, sizeof(rules));
+	rules.rules = getenv("XKB_DEFAULT_RULES");
+	rules.model = getenv("XKB_DEFAULT_MODEL");
+	rules.layout = getenv("XKB_DEFAULT_LAYOUT");
+	rules.variant = getenv("XKB_DEFAULT_VARIANT");
+	rules.options = getenv("XKB_DEFAULT_OPTIONS");
+	struct xkb_context *context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
+	if (!context) {
+		wlr_log(L_ERROR, "Failed to create XKB context");
+		exit(1);
+	}
+	kbstate->keymap = xkb_map_new_from_names(
+			context, &rules, XKB_KEYMAP_COMPILE_NO_FLAGS);
+	if (!kbstate->keymap) {
+		wlr_log(L_ERROR, "Failed to create XKB keymap");
+		exit(1);
+	}
+	xkb_context_unref(context);
+	kbstate->xkb_state = xkb_state_new(kbstate->keymap);
+	if (!kbstate->xkb_state) {
+		wlr_log(L_ERROR, "Failed to create XKB state");
+		exit(1);
+	}
+	const char *led_names[3] = {
+		XKB_LED_NAME_NUM,
+		XKB_LED_NAME_CAPS,
+		XKB_LED_NAME_SCROLL
+	};
+	for (uint32_t i = 0; i < 3; ++i) {
+		kbstate->leds[i] = xkb_map_led_get_index(kbstate->keymap, led_names[i]);
+	}
+}
+
+static void pointer_motion_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_pointer_motion *event = data;
+	struct pointer_state *pstate = wl_container_of(listener, pstate, motion);
+	if (pstate->compositor->pointer_motion_cb) {
+		pstate->compositor->pointer_motion_cb(pstate,
+				event->delta_x, event->delta_y);
+	}
+}
+
+static void pointer_motion_absolute_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_pointer_motion_absolute *event = data;
+	struct pointer_state *pstate = wl_container_of(listener, pstate, motion_absolute);
+	if (pstate->compositor->pointer_motion_absolute_cb) {
+		pstate->compositor->pointer_motion_absolute_cb(pstate,
+				event->x_mm, event->y_mm);
+	}
+}
+
+static void pointer_button_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_pointer_button *event = data;
+	struct pointer_state *pstate = wl_container_of(listener, pstate, button);
+	if (pstate->compositor->pointer_button_cb) {
+		pstate->compositor->pointer_button_cb(pstate,
+				event->button, event->state);
+	}
+}
+
+static void pointer_axis_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_pointer_axis *event = data;
+	struct pointer_state *pstate = wl_container_of(listener, pstate, axis);
+	if (pstate->compositor->pointer_axis_cb) {
+		pstate->compositor->pointer_axis_cb(pstate,
+				event->source, event->orientation, event->delta);
+	}
+}
+
+static void pointer_add(struct wlr_input_device *device, struct compositor_state *state) {
+	struct pointer_state *pstate = calloc(sizeof(struct pointer_state), 1);
+	pstate->device = device;
+	pstate->compositor = state;
+	wl_list_init(&pstate->motion.link);
+	wl_list_init(&pstate->motion_absolute.link);
+	wl_list_init(&pstate->button.link);
+	wl_list_init(&pstate->axis.link);
+	pstate->motion.notify = pointer_motion_notify;
+	pstate->motion_absolute.notify = pointer_motion_absolute_notify;
+	pstate->button.notify = pointer_button_notify;
+	pstate->axis.notify = pointer_axis_notify;
+	wl_signal_add(&device->pointer->events.motion, &pstate->motion);
+	wl_signal_add(&device->pointer->events.motion_absolute, &pstate->motion_absolute);
+	wl_signal_add(&device->pointer->events.button, &pstate->button);
+	wl_signal_add(&device->pointer->events.axis, &pstate->axis);
+	wl_list_insert(&state->pointers, &pstate->link);
+}
+
+static void touch_down_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_touch_down *event = data;
+	struct touch_state *tstate = wl_container_of(listener, tstate, down);
+	if (tstate->compositor->touch_down_cb) {
+		tstate->compositor->touch_down_cb(tstate, event->slot,
+			event->x_mm, event->y_mm, event->width_mm, event->height_mm);
+	}
+}
+
+static void touch_motion_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_touch_motion *event = data;
+	struct touch_state *tstate = wl_container_of(listener, tstate, motion);
+	if (tstate->compositor->touch_motion_cb) {
+		tstate->compositor->touch_motion_cb(tstate, event->slot,
+			event->x_mm, event->y_mm, event->width_mm, event->height_mm);
+	}
+}
+
+static void touch_up_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_touch_up *event = data;
+	struct touch_state *tstate = wl_container_of(listener, tstate, up);
+	if (tstate->compositor->touch_up_cb) {
+		tstate->compositor->touch_up_cb(tstate, event->slot);
+	}
+}
+
+static void touch_cancel_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_touch_cancel *event = data;
+	struct touch_state *tstate = wl_container_of(listener, tstate, cancel);
+	if (tstate->compositor->touch_cancel_cb) {
+		tstate->compositor->touch_cancel_cb(tstate, event->slot);
+	}
+}
+
+static void touch_add(struct wlr_input_device *device, struct compositor_state *state) {
+	struct touch_state *tstate = calloc(sizeof(struct touch_state), 1);
+	tstate->device = device;
+	tstate->compositor = state;
+	wl_list_init(&tstate->down.link);
+	wl_list_init(&tstate->motion.link);
+	wl_list_init(&tstate->up.link);
+	wl_list_init(&tstate->cancel.link);
+	tstate->down.notify = touch_down_notify;
+	tstate->motion.notify = touch_motion_notify;
+	tstate->up.notify = touch_up_notify;
+	tstate->cancel.notify = touch_cancel_notify;
+	wl_signal_add(&device->touch->events.down, &tstate->down);
+	wl_signal_add(&device->touch->events.motion, &tstate->motion);
+	wl_signal_add(&device->touch->events.up, &tstate->up);
+	wl_signal_add(&device->touch->events.cancel, &tstate->cancel);
+	wl_list_insert(&state->touch, &tstate->link);
+}
+
+static void tablet_tool_axis_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_tablet_tool_axis *event = data;
+	struct tablet_tool_state *tstate = wl_container_of(listener, tstate, axis);
+	if (tstate->compositor->tool_axis_cb) {
+		tstate->compositor->tool_axis_cb(tstate, event);
+	}
+}
+
+static void tablet_tool_proximity_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_tablet_tool_proximity *event = data;
+	struct tablet_tool_state *tstate = wl_container_of(listener, tstate, proximity);
+	if (tstate->compositor->tool_proximity_cb) {
+		tstate->compositor->tool_proximity_cb(tstate, event->state);
+	}
+}
+
+static void tablet_tool_button_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_tablet_tool_button *event = data;
+	struct tablet_tool_state *tstate = wl_container_of(listener, tstate, button);
+	if (tstate->compositor->tool_button_cb) {
+		tstate->compositor->tool_button_cb(tstate, event->button, event->state);
+	}
+}
+
+static void tablet_tool_add(struct wlr_input_device *device,
+		struct compositor_state *state) {
+	struct tablet_tool_state *tstate = calloc(sizeof(struct tablet_tool_state), 1);
+	tstate->device = device;
+	tstate->compositor = state;
+	wl_list_init(&tstate->axis.link);
+	wl_list_init(&tstate->proximity.link);
+	wl_list_init(&tstate->tip.link);
+	wl_list_init(&tstate->button.link);
+	tstate->axis.notify = tablet_tool_axis_notify;
+	tstate->proximity.notify = tablet_tool_proximity_notify;
+	//tstate->tip.notify = tablet_tool_tip_notify;
+	tstate->button.notify = tablet_tool_button_notify;
+	wl_signal_add(&device->tablet_tool->events.axis, &tstate->axis);
+	wl_signal_add(&device->tablet_tool->events.proximity, &tstate->proximity);
+	//wl_signal_add(&device->tablet_tool->events.tip, &tstate->tip);
+	wl_signal_add(&device->tablet_tool->events.button, &tstate->button);
+	wl_list_insert(&state->tablet_tools, &tstate->link);
+}
+
+static void tablet_pad_button_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_tablet_pad_button *event = data;
+	struct tablet_pad_state *pstate = wl_container_of(listener, pstate, button);
+	if (pstate->compositor->pad_button_cb) {
+		pstate->compositor->pad_button_cb(pstate, event->button, event->state);
+	}
+}
+
+static void tablet_pad_add(struct wlr_input_device *device,
+		struct compositor_state *state) {
+	struct tablet_pad_state *pstate = calloc(sizeof(struct tablet_pad_state), 1);
+	pstate->device = device;
+	pstate->compositor = state;
+	wl_list_init(&pstate->button.link);
+	pstate->button.notify = tablet_pad_button_notify;
+	wl_signal_add(&device->tablet_pad->events.button, &pstate->button);
+	wl_list_insert(&state->tablet_pads, &pstate->link);
+}
+
+static void input_add_notify(struct wl_listener *listener, void *data) {
+	struct wlr_input_device *device = data;
+	struct compositor_state *state = wl_container_of(listener, state, input_add);
+	switch (device->type) {
+	case WLR_INPUT_DEVICE_KEYBOARD:
+		keyboard_add(device, state);
+		break;
+	case WLR_INPUT_DEVICE_POINTER:
+		pointer_add(device, state);
+		break;
+	case WLR_INPUT_DEVICE_TOUCH:
+		touch_add(device, state);
+		break;
+	case WLR_INPUT_DEVICE_TABLET_TOOL:
+		tablet_tool_add(device, state);
+		break;
+	case WLR_INPUT_DEVICE_TABLET_PAD:
+		tablet_pad_add(device, state);
+		break;
+	default:
+		break;
+	}
+}
+
+static void keyboard_remove(struct wlr_input_device *device, struct compositor_state *state) {
+	struct keyboard_state *kbstate = NULL, *_kbstate;
+	wl_list_for_each(_kbstate, &state->keyboards, link) {
+		if (_kbstate->device == device) {
+			kbstate = _kbstate;
+			break;
+		}
+	}
+	if (!kbstate) {
+		return;
+	}
+	wl_list_remove(&kbstate->link);
+	wl_list_remove(&kbstate->key.link);
+}
+
+static void pointer_remove(struct wlr_input_device *device, struct compositor_state *state) {
+	struct pointer_state *pstate = NULL, *_pstate;
+	wl_list_for_each(_pstate, &state->pointers, link) {
+		if (_pstate->device == device) {
+			pstate = _pstate;
+			break;
+		}
+	}
+	if (!pstate) {
+		return;
+	}
+	wl_list_remove(&pstate->link);
+	wl_list_remove(&pstate->motion.link);
+	wl_list_remove(&pstate->motion_absolute.link);
+	wl_list_remove(&pstate->button.link);
+	wl_list_remove(&pstate->axis.link);
+}
+
+static void touch_remove(struct wlr_input_device *device, struct compositor_state *state) {
+	struct touch_state *tstate = NULL, *_tstate;
+	wl_list_for_each(_tstate, &state->touch, link) {
+		if (_tstate->device == device) {
+			tstate = _tstate;
+			break;
+		}
+	}
+	if (!tstate) {
+		return;
+	}
+	wl_list_remove(&tstate->link);
+	wl_list_remove(&tstate->down.link);
+	wl_list_remove(&tstate->motion.link);
+	wl_list_remove(&tstate->up.link);
+	wl_list_remove(&tstate->cancel.link);
+}
+
+static void tablet_tool_remove(struct wlr_input_device *device, struct compositor_state *state) {
+	struct tablet_tool_state *tstate = NULL, *_tstate;
+	wl_list_for_each(_tstate, &state->tablet_tools, link) {
+		if (_tstate->device == device) {
+			tstate = _tstate;
+			break;
+		}
+	}
+	if (!tstate) {
+		return;
+	}
+	wl_list_remove(&tstate->link);
+	wl_list_remove(&tstate->axis.link);
+	wl_list_remove(&tstate->proximity.link);
+	//wl_list_remove(&tstate->tip.link);
+	wl_list_remove(&tstate->button.link);
+}
+
+static void input_remove_notify(struct wl_listener *listener, void *data) {
+	struct wlr_input_device *device = data;
+	struct compositor_state *state = wl_container_of(listener, state, input_add);
+	switch (device->type) {
+	case WLR_INPUT_DEVICE_KEYBOARD:
+		keyboard_remove(device, state);
+		break;
+	case WLR_INPUT_DEVICE_POINTER:
+		pointer_remove(device, state);
+		break;
+	case WLR_INPUT_DEVICE_TOUCH:
+		touch_remove(device, state);
+		break;
+	case WLR_INPUT_DEVICE_TABLET_TOOL:
+		tablet_tool_remove(device, state);
+		break;
+	default:
+		break;
+	}
+}
+
+static void output_frame_notify(struct wl_listener *listener, void *data) {
+	struct output_state *output = wl_container_of(listener, output, frame);
+	struct compositor_state *compositor = output->compositor;
+
+	struct timespec now;
+	clock_gettime(CLOCK_MONOTONIC, &now);
+	if (compositor->output_frame_cb) {
+		compositor->output_frame_cb(output, &now);
+	}
+
+	output->last_frame = now;
+	compositor->last_frame = now;
+}
+
+static void output_add_notify(struct wl_listener *listener, void *data) {
+	struct wlr_output *output = data;
+	struct compositor_state *state = wl_container_of(listener, state, output_add);
+	wlr_log(L_DEBUG, "Output '%s' added", output->name);
+	wlr_log(L_DEBUG, "%s %s %"PRId32"mm x %"PRId32"mm", output->make, output->model,
+		output->phys_width, output->phys_height);
+	if (output->modes->length > 0) {
+		wlr_output_set_mode(output, output->modes->items[0]);
+	}
+	struct output_state *ostate = calloc(1, sizeof(struct output_state));
+	clock_gettime(CLOCK_MONOTONIC, &ostate->last_frame);
+	ostate->output = output;
+	ostate->compositor = state;
+	ostate->frame.notify = output_frame_notify;
+	wl_list_init(&ostate->frame.link);
+	wl_signal_add(&output->events.frame, &ostate->frame);
+	wl_list_insert(&state->outputs, &ostate->link);
+	if (state->output_add_cb) {
+		state->output_add_cb(ostate);
+	}
+}
+
+static void output_remove_notify(struct wl_listener *listener, void *data) {
+	struct wlr_output *output = data;
+	struct compositor_state *state = wl_container_of(listener, state, output_remove);
+	struct output_state *ostate = NULL, *_ostate;
+	wl_list_for_each(_ostate, &state->outputs, link) {
+		if (_ostate->output == output) {
+			ostate = _ostate;
+			break;
+		}
+	}
+	if (!ostate) {
+		return; // We are unfamiliar with this output
+	}
+	if (state->output_remove_cb) {
+		state->output_remove_cb(ostate);
+	}
+	wl_list_remove(&ostate->link);
+	wl_list_remove(&ostate->frame.link);
+}
+
+void compositor_init(struct compositor_state *state) {
+	state->display = wl_display_create();
+	state->event_loop = wl_display_get_event_loop(state->display);
+	state->session = wlr_session_start(state->display);
+	if (!state->session
+			|| !state->display
+			|| !state->event_loop) {
+		exit(1);
+	}
+
+	wl_list_init(&state->keyboards);
+	wl_list_init(&state->pointers);
+	wl_list_init(&state->touch);
+	wl_list_init(&state->tablet_tools);
+	wl_list_init(&state->tablet_pads);
+	wl_list_init(&state->input_add.link);
+	state->input_add.notify = input_add_notify;
+	wl_list_init(&state->input_remove.link);
+	state->input_remove.notify = input_remove_notify;
+
+	wl_list_init(&state->outputs);
+	wl_list_init(&state->output_add.link);
+	state->output_add.notify = output_add_notify;
+	wl_list_init(&state->output_remove.link);
+	state->output_remove.notify = output_remove_notify;
+
+	struct wlr_backend *wlr = wlr_backend_autocreate(
+			state->display, state->session);
+	if (!wlr) {
+		exit(1);
+	}
+	wl_signal_add(&wlr->events.input_add, &state->input_add);
+	wl_signal_add(&wlr->events.input_remove, &state->input_remove);
+	wl_signal_add(&wlr->events.output_add, &state->output_add);
+	wl_signal_add(&wlr->events.output_remove, &state->output_remove);
+	state->backend = wlr;
+
+	clock_gettime(CLOCK_MONOTONIC, &state->last_frame);
+
+	const char *socket = wl_display_add_socket_auto(state->display);
+	wlr_log(L_INFO, "Running compositor on wayland display '%s'", socket);
+	setenv("_WAYLAND_DISPLAY", socket, true);
+	if (!wlr_backend_init(state->backend)) {
+		wlr_log(L_ERROR, "Failed to initialize backend");
+		exit(1);
+	}
+}
+
+void compositor_run(struct compositor_state *state) {
+	wl_display_run(state->display);
+	wlr_backend_destroy(state->backend);
+	wlr_session_finish(state->session);
+	wl_display_destroy(state->display);
+}

examples/shared.h

@@ -0,0 +1,135 @@
+#ifndef _EXAMPLE_SHARED_H
+#define _EXAMPLE_SHARED_H
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200112L
+#endif
+#include <time.h>
+#include <stdbool.h>
+#include <xkbcommon/xkbcommon.h>
+#include <wayland-server-protocol.h>
+#include <wlr/backend.h>
+#include <wlr/session.h>
+#include <wlr/types/wlr_output.h>
+#include <wlr/types/wlr_input_device.h>
+
+struct output_state {
+	struct compositor_state *compositor;
+	struct wlr_output *output;
+	struct wl_listener frame;
+	struct timespec last_frame;
+	struct wl_list link;
+	void *data;
+};
+
+struct keyboard_state {
+	struct compositor_state *compositor;
+	struct wlr_input_device *device;
+	struct wl_listener key;
+	struct wl_list link;
+	struct xkb_keymap *keymap;
+	struct xkb_state *xkb_state;
+	xkb_led_index_t leds[WLR_LED_LAST];
+	void *data;
+};
+
+struct pointer_state {
+	struct compositor_state *compositor;
+	struct wlr_input_device *device;
+	struct wl_listener motion;
+	struct wl_listener motion_absolute;
+	struct wl_listener button;
+	struct wl_listener axis;
+	struct wl_list link;
+	void *data;
+};
+
+struct touch_state {
+	struct compositor_state *compositor;
+	struct wlr_input_device *device;
+	struct wl_listener down;
+	struct wl_listener up;
+	struct wl_listener motion;
+	struct wl_listener cancel;
+	struct wl_list link;
+	void *data;
+};
+
+struct tablet_tool_state {
+	struct compositor_state *compositor;
+	struct wlr_input_device *device;
+	struct wl_listener axis;
+	struct wl_listener proximity;
+	struct wl_listener tip;
+	struct wl_listener button;
+	struct wl_list link;
+	void *data;
+};
+
+struct tablet_pad_state {
+	struct compositor_state *compositor;
+	struct wlr_input_device *device;
+	struct wl_listener button;
+	struct wl_list link;
+	void *data;
+};
+
+struct compositor_state {
+	void (*output_add_cb)(struct output_state *s);
+	void (*keyboard_add_cb)(struct keyboard_state *s);
+	void (*output_frame_cb)(struct output_state *s, struct timespec *ts);
+	void (*output_remove_cb)(struct output_state *s);
+	void (*keyboard_remove_cb)(struct keyboard_state *s);
+	void (*keyboard_key_cb)(struct keyboard_state *s, xkb_keysym_t sym,
+			enum wlr_key_state key_state);
+	void (*pointer_motion_cb)(struct pointer_state *s,
+			double d_x, double d_y);
+	void (*pointer_motion_absolute_cb)(struct pointer_state *s,
+			double x, double y);
+	void (*pointer_button_cb)(struct pointer_state *s,
+			uint32_t button, enum wlr_button_state state);
+	void (*pointer_axis_cb)(struct pointer_state *s,
+		enum wlr_axis_source source,
+		enum wlr_axis_orientation orientation,
+		double delta);
+	void (*touch_down_cb)(struct touch_state *s, int32_t slot,
+		double x, double y, double width, double height);
+	void (*touch_motion_cb)(struct touch_state *s, int32_t slot,
+		double x, double y, double width, double height);
+	void (*touch_up_cb)(struct touch_state *s, int32_t slot);
+	void (*touch_cancel_cb)(struct touch_state *s, int32_t slot);
+	void (*tool_axis_cb)(struct tablet_tool_state *s,
+			struct wlr_event_tablet_tool_axis *event);
+	void (*tool_proximity_cb)(struct tablet_tool_state *s,
+			enum wlr_tablet_tool_proximity_state proximity);
+	void (*tool_tip_cb)(struct tablet_tool_state *s,
+			enum wlr_tablet_tool_tip_state state);
+	void (*tool_button_cb)(struct tablet_tool_state *s,
+			uint32_t button, enum wlr_button_state state);
+	void (*pad_button_cb)(struct tablet_pad_state *s,
+			uint32_t button, enum wlr_button_state state);
+
+	struct wl_display *display;
+	struct wl_event_loop *event_loop;
+	struct wlr_backend *backend;
+	struct wlr_session *session;
+
+	struct wl_list keyboards;
+	struct wl_list pointers;
+	struct wl_list touch;
+	struct wl_list tablet_tools;
+	struct wl_list tablet_pads;
+	struct wl_listener input_add;
+	struct wl_listener input_remove;
+
+	struct timespec last_frame;
+	struct wl_listener output_add;
+	struct wl_listener output_remove;
+	struct wl_list outputs;
+
+	void *data;
+};
+
+void compositor_init(struct compositor_state *state);
+void compositor_run(struct compositor_state *state);
+
+#endif

examples/simple.c

@@ -0,0 +1,56 @@
+#define _POSIX_C_SOURCE 199309L
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <inttypes.h>
+#include <wayland-server.h>
+#include <GLES2/gl2.h>
+#include <wlr/backend.h>
+#include <wlr/session.h>
+#include <wlr/types/wlr_output.h>
+#include <xkbcommon/xkbcommon.h>
+#include "shared.h"
+
+struct sample_state {
+	float color[3];
+	int dec;
+};
+
+void handle_output_frame(struct output_state *output, struct timespec *ts) {
+	struct compositor_state *state = output->compositor;
+	struct sample_state *sample = state->data;
+
+	long ms = (ts->tv_sec - state->last_frame.tv_sec) * 1000 +
+		(ts->tv_nsec - state->last_frame.tv_nsec) / 1000000;
+	int inc = (sample->dec + 1) % 3;
+
+	sample->color[inc] += ms / 2000.0f;
+	sample->color[sample->dec] -= ms / 2000.0f;
+
+	if (sample->color[sample->dec] < 0.0f) {
+		sample->color[inc] = 1.0f;
+		sample->color[sample->dec] = 0.0f;
+		sample->dec = inc;
+	}
+
+	wlr_output_make_current(output->output);
+
+	glClearColor(sample->color[0], sample->color[1], sample->color[2], 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	wlr_output_swap_buffers(output->output);
+}
+
+int main() {
+	struct sample_state state = {
+		.color = { 1.0, 0.0, 0.0 },
+		.dec = 0,
+	};
+	struct compositor_state compositor = { 0,
+		.data = &state,
+		.output_frame_cb = handle_output_frame,
+	};
+	compositor_init(&compositor);
+	compositor_run(&compositor);
+}

examples/tablet.c

@@ -0,0 +1,160 @@
+#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 <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/session.h>
+#include <wlr/types/wlr_output.h>
+#include <wlr/types/wlr_tablet_tool.h>
+#include <wlr/types/wlr_tablet_pad.h>
+#include <math.h>
+#include "shared.h"
+#include "cat.h"
+
+struct sample_state {
+	struct wlr_renderer *renderer;
+	bool proximity, tap, button;
+	double distance;
+	double pressure;
+	double x_mm, y_mm;
+	double width_mm, height_mm;
+	struct wl_list link;
+	float tool_color[4];
+	float pad_color[4];
+};
+
+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;
+
+	int32_t width, height;
+	wlr_output_effective_resolution(wlr_output, &width, &height);
+
+	wlr_output_make_current(wlr_output);
+	wlr_renderer_begin(sample->renderer, wlr_output);
+
+	float matrix[16], view[16];
+	float distance = 0.8f * (1 - sample->distance);
+	float tool_color[4] = { distance, distance, distance, 1 };
+	for (size_t i = 0; sample->button && i < 4; ++i) {
+		tool_color[i] = sample->tool_color[i];
+	}
+	float scale = 4;
+
+	float pad_width = sample->width_mm * scale;
+	float pad_height = sample->height_mm * scale;
+	float left = width / 2.0f - pad_width / 2.0f;
+	float top = height / 2.0f - pad_height / 2.0f;
+	wlr_matrix_translate(&matrix, left, top, 0);
+	wlr_matrix_scale(&view, pad_width, pad_height, 1);
+	wlr_matrix_mul(&matrix, &view, &view);
+	wlr_matrix_mul(&wlr_output->transform_matrix, &view, &matrix);
+	wlr_render_colored_quad(sample->renderer, &sample->pad_color, &matrix);
+
+	if (sample->proximity) {
+		wlr_matrix_translate(&matrix,
+				sample->x_mm * scale - 8 * (sample->pressure + 1) + left,
+				sample->y_mm * scale - 8 * (sample->pressure + 1) + top, 0);
+		wlr_matrix_scale(&view,
+				16 * (sample->pressure + 1),
+				16 * (sample->pressure + 1), 1);
+		wlr_matrix_mul(&matrix, &view, &view);
+		wlr_matrix_mul(&wlr_output->transform_matrix, &view, &matrix);
+		wlr_render_colored_ellipse(sample->renderer, &tool_color, &matrix);
+	}
+
+	wlr_renderer_end(sample->renderer);
+	wlr_output_swap_buffers(wlr_output);
+}
+
+static void handle_tool_axis(struct tablet_tool_state *tstate,
+			struct wlr_event_tablet_tool_axis *event) {
+	struct sample_state *sample = tstate->compositor->data;
+	sample->width_mm = event->width_mm;
+	sample->height_mm = event->height_mm;
+	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_X)) {
+		sample->x_mm = event->x_mm;
+	}
+	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_Y)) {
+		sample->y_mm = event->y_mm;
+	}
+	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_DISTANCE)) {
+		sample->distance = event->distance;
+	}
+	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_PRESSURE)) {
+		sample->pressure = event->pressure;
+	}
+}
+
+static void handle_tool_proximity(struct tablet_tool_state *tstate,
+		enum wlr_tablet_tool_proximity_state state) {
+	struct sample_state *sample = tstate->compositor->data;
+	sample->proximity = state == WLR_TABLET_TOOL_PROXIMITY_IN;
+}
+
+static void handle_tool_button(struct tablet_tool_state *tstate,
+		uint32_t button, enum wlr_button_state state) {
+	struct sample_state *sample = tstate->compositor->data;
+	if (state == WLR_BUTTON_RELEASED) {
+		sample->button = false;
+	} else {
+		sample->button = true;
+		for (size_t i = 0; i < 3; ++i) {
+			if (button % 3 == i) {
+				sample->tool_color[i] = 0;
+			} else {
+				sample->tool_color[i] = 1;
+			}
+		}
+	}
+}
+
+static void handle_pad_button(struct tablet_pad_state *pstate,
+		uint32_t button, enum wlr_button_state state) {
+	struct sample_state *sample = pstate->compositor->data;
+	float default_color[4] = { 0.75, 0.75, 0.75, 1.0 };
+	if (state == WLR_BUTTON_RELEASED) {
+		memcpy(sample->pad_color, default_color, sizeof(default_color));
+	} else {
+		for (size_t i = 0; i < 3; ++i) {
+			if (button % 3 == i) {
+				sample->pad_color[i] = 0;
+			} else {
+				sample->pad_color[i] = 1;
+			}
+		}
+	}
+}
+
+int main(int argc, char *argv[]) {
+	struct sample_state state = {
+		.tool_color = { 1, 1, 1, 1 },
+		.pad_color = { 0.75, 0.75, 0.75, 1.0 }
+	};
+	struct compositor_state compositor = { 0,
+		.data = &state,
+		.output_frame_cb = handle_output_frame,
+		.tool_axis_cb = handle_tool_axis,
+		.tool_proximity_cb = handle_tool_proximity,
+		.tool_button_cb = handle_tool_button,
+		.pad_button_cb = handle_pad_button,
+	};
+	compositor_init(&compositor);
+
+	state.renderer = wlr_gles2_renderer_init();
+
+	compositor_run(&compositor);
+
+	wlr_renderer_destroy(state.renderer);
+}

examples/touch.c

@@ -0,0 +1,116 @@
+#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 <stdint.h>
+#include <math.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/session.h>
+#include <wlr/util/list.h>
+#include "shared.h"
+#include "cat.h"
+
+struct sample_state {
+	struct wlr_renderer *renderer;
+	struct wlr_surface *cat_texture;
+	list_t *touch_points;
+};
+
+struct touch_point {
+	int32_t slot;
+	double x, y;
+};
+
+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;
+
+	int32_t width, height;
+	wlr_output_effective_resolution(wlr_output, &width, &height);
+
+	wlr_output_make_current(wlr_output);
+	wlr_renderer_begin(sample->renderer, wlr_output);
+
+	float matrix[16];
+	for (size_t i = 0; i < sample->touch_points->length; ++i) {
+		struct touch_point *p = sample->touch_points->items[i];
+		wlr_surface_get_matrix(sample->cat_texture, &matrix,
+			&wlr_output->transform_matrix,
+			(int)(p->x * width) - sample->cat_texture->width / 2,
+			(int)(p->y * height) - sample->cat_texture->height / 2);
+		wlr_render_with_matrix(sample->renderer,
+				sample->cat_texture, &matrix);
+	}
+
+	wlr_renderer_end(sample->renderer);
+	wlr_output_swap_buffers(wlr_output);
+}
+
+static void handle_touch_down(struct touch_state *tstate, int32_t slot,
+		double x, double y, double width, double height) {
+	struct sample_state *sample = tstate->compositor->data;
+	struct touch_point *point = calloc(1, sizeof(struct touch_state));
+	point->slot = slot;
+	point->x = x / width;
+	point->y = y / height;
+	list_add(sample->touch_points, point);
+}
+
+static void handle_touch_up(struct touch_state *tstate, int32_t slot) {
+	struct sample_state *sample = tstate->compositor->data;
+	for (size_t i = 0; i < sample->touch_points->length; ++i) {
+		struct touch_point *point = sample->touch_points->items[i];
+		if (point->slot == slot) {
+			list_del(sample->touch_points, i);
+			break;
+		}
+	}
+}
+
+static void handle_touch_motion(struct touch_state *tstate, int32_t slot,
+		double x, double y, double width, double height) {
+	struct sample_state *sample = tstate->compositor->data;
+	for (size_t i = 0; i < sample->touch_points->length; ++i) {
+		struct touch_point *point = sample->touch_points->items[i];
+		if (point->slot == slot) {
+			point->x = x / width;
+			point->y = y / height;
+			break;
+		}
+	}
+}
+
+int main(int argc, char *argv[]) {
+	struct sample_state state = {
+		.touch_points = list_create()
+	};
+	struct compositor_state compositor = { 0,
+		.data = &state,
+		.output_frame_cb = handle_output_frame,
+		.touch_down_cb = handle_touch_down,
+		.touch_up_cb = handle_touch_up,
+		.touch_motion_cb = handle_touch_motion,
+	};
+	compositor_init(&compositor);
+
+	state.renderer = wlr_gles2_renderer_init();
+	state.cat_texture = wlr_render_surface_init(state.renderer);
+	wlr_surface_attach_pixels(state.cat_texture, GL_RGBA,
+		cat_tex.width, cat_tex.width, cat_tex.height, cat_tex.pixel_data);
+
+	compositor_run(&compositor);
+
+	wlr_surface_destroy(state.cat_texture);
+	wlr_renderer_destroy(state.renderer);
+}