Flesh out keyboard support in examples

2 files changed, 140 insertions, 27 deletions

diff --git a/example/rotation.c b/example/rotation.c
index 12778f8e..24c9f494 100644
--- a/example/rotation.c
+++ b/example/rotation.c
@@ -7,6 +7,7 @@
 #include <unistd.h>
 #include <wayland-server.h>
 #include <wayland-server-protocol.h>
+#include <xkbcommon/xkbcommon.h>
 #include <GLES3/gl3.h>
 #include <wlr/render/matrix.h>
 #include <wlr/render/gles3.h>
@@ -18,10 +19,19 @@
 #include "cat.h"
 
 struct state {
+	struct wl_list config;
+	struct xkb_keymap *keymap;
+	struct xkb_state *xkb_state;
+	bool exit;
+
+	struct wl_list keyboards;
+	struct wl_listener input_add;
+	struct wl_listener input_remove;
+
+	struct wl_list outputs;
 	struct wl_listener output_add;
 	struct wl_listener output_remove;
-	struct wl_list outputs;
-	struct wl_list config;
+
 	struct wlr_renderer *renderer;
 	struct wlr_surface *cat_texture;
 };
@@ -33,6 +43,7 @@ struct output_state {
 	struct state *state;
 	struct wl_listener frame;
 	float x_offs, y_offs;
+	float x_vel, y_vel;
 };
 
 struct output_config {
@@ -41,6 +52,13 @@ struct output_config {
 	struct wl_list link;
 };
 
+struct keyboard_state {
+	struct state *state;
+	struct wlr_input_device *device;
+	struct wl_listener key;
+	struct wl_list link;
+};
+
 static void output_frame(struct wl_listener *listener, void *data) {
 	struct output_state *ostate = wl_container_of(listener, ostate, frame);
 	struct wlr_output *output = ostate->output;
@@ -68,8 +86,8 @@ static void output_frame(struct wl_listener *listener, void *data) {
 		(now.tv_nsec - ostate->last_frame.tv_nsec) / 1000000;
 	float seconds = ms / 1000.0f;
 
-	ostate->x_offs += 128 * seconds;
-	ostate->y_offs += 128 * seconds;
+	ostate->x_offs += ostate->x_vel * seconds;
+	ostate->y_offs += ostate->y_vel * seconds;
 	if (ostate->x_offs > 128) ostate->x_offs = 0;
 	if (ostate->y_offs > 128) ostate->y_offs = 0;
 	ostate->last_frame = now;
@@ -89,6 +107,7 @@ static void output_add(struct wl_listener *listener, void *data) {
 	ostate->state = state;
 	ostate->frame.notify = output_frame;
 	ostate->x_offs = ostate->y_offs = 0;
+	ostate->x_vel = ostate->y_vel = 128;
 
 	struct output_config *conf;
 	wl_list_for_each(conf, &state->config, link) {
@@ -118,9 +137,91 @@ static void output_remove(struct wl_listener *listener, void *data) {
 	}
 }
 
-static int timer_done(void *data) {
-	*(bool *)data = true;
-	return 1;
+static void update_velocities(struct state *state, float x_diff, float y_diff) {
+	struct output_state *ostate;
+	wl_list_for_each(ostate, &state->outputs, link) {
+		ostate->x_vel += x_diff;
+		ostate->y_vel += y_diff;
+	}
+}
+
+static void handle_keysym(struct state *state, xkb_keysym_t sym,
+		enum wlr_key_state key_state) {
+	char name[64];
+	int l = xkb_keysym_get_name(sym, name, sizeof(name));
+	if (l != -1 && l != sizeof(name)) {
+		fprintf(stderr, "Key event: %s %s\n", name,
+				key_state == WLR_KEY_PRESSED ? "pressed" : "released");
+	}
+	// NOTE: It may be better to simply refer to our key state during each frame
+	// and make this change in pixels/sec^2
+	if (key_state == WLR_KEY_PRESSED) {
+		switch (sym) {
+		case XKB_KEY_Escape:
+			state->exit = true;
+			break;
+		case XKB_KEY_Left:
+			update_velocities(state, -16, 0);
+			break;
+		case XKB_KEY_Right:
+			update_velocities(state, 16, 0);
+			break;
+		case XKB_KEY_Up:
+			update_velocities(state, 0, -16);
+			break;
+		case XKB_KEY_Down:
+			update_velocities(state, 0, 16);
+			break;
+		}
+	}
+}
+
+static void keyboard_key(struct wl_listener *listener, void *data) {
+	struct wlr_keyboard_key *event = data;
+	struct keyboard_state *kbstate = wl_container_of(listener, kbstate, key);
+	uint32_t keycode = event->keycode + 8;
+	const xkb_keysym_t *syms;
+	int nsyms = xkb_state_key_get_syms(kbstate->state->xkb_state, keycode, &syms);
+	for (int i = 0; i < nsyms; ++i) {
+		handle_keysym(kbstate->state, syms[i], event->state);
+	}
+	xkb_state_update_key(kbstate->state->xkb_state, keycode,
+		event->state == WLR_KEY_PRESSED ?  XKB_KEY_DOWN : XKB_KEY_UP);
+}
+
+void input_add(struct wl_listener *listener, void *data) {
+	struct wlr_input_device *device = data;
+	struct state *state = wl_container_of(listener, state, input_add);
+	if (device->type != WLR_INPUT_DEVICE_KEYBOARD) {
+		return;
+	}
+	struct keyboard_state *kbstate = calloc(sizeof(struct keyboard_state), 1);
+	kbstate->device = device;
+	kbstate->state = state;
+	wl_list_init(&kbstate->key.link);
+	kbstate->key.notify = keyboard_key;
+	wl_signal_add(&device->keyboard->events.key, &kbstate->key);
+	wl_list_insert(&state->keyboards, &kbstate->link);
+}
+
+void input_remove(struct wl_listener *listener, void *data) {
+	struct wlr_input_device *device = data;
+	struct state *state = wl_container_of(listener, state, input_add);
+	if (device->type != WLR_INPUT_DEVICE_KEYBOARD) {
+		return;
+	}
+	struct keyboard_state *kbstate = NULL, *_kbstate;
+	wl_list_for_each(_kbstate, &state->keyboards, link) {
+		if (_kbstate->device == device) {
+			kbstate = kbstate;
+			break;
+		}
+	}
+	if (!kbstate) {
+		return; // We are unfamiliar with this keyboard
+	}
+	wl_list_remove(&kbstate->link);
+	wl_list_remove(&kbstate->key.link);
 }
 
 static void usage(const char *name, int ret) {
@@ -191,10 +292,38 @@ static void parse_args(int argc, char *argv[], struct wl_list *config) {
 
 int main(int argc, char *argv[]) {
 	struct state state = {
+		.exit = false,
+		.input_add = { .notify = input_add },
+		.input_remove = { .notify = input_remove },
 		.output_add = { .notify = output_add },
 		.output_remove = { .notify = output_remove }
 	};
 
+	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) {
+		fprintf(stderr, "Failed to create XKB context\n");
+		return 1;
+	}
+	state.keymap =
+		xkb_map_new_from_names(context, &rules, XKB_KEYMAP_COMPILE_NO_FLAGS);
+	if (!state.keymap) {
+		fprintf(stderr, "Failed to create XKB keymap\n");
+		return 1;
+	}
+	xkb_context_unref(context);
+	state.xkb_state = xkb_state_new(state.keymap);
+
+	wl_list_init(&state.keyboards);
+	wl_list_init(&state.input_add.link);
+	wl_list_init(&state.input_remove.link);
+
 	wl_list_init(&state.outputs);
 	wl_list_init(&state.config);
 	wl_list_init(&state.output_add.link);
@@ -215,10 +344,11 @@ int main(int argc, char *argv[]) {
 		return 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);
-
-	if (!wlr_backend_init(wlr)) {
+	if (!wlr || !wlr_backend_init(wlr)) {
 		printf("Failed to initialize backend, bailing out\n");
 		return 1;
 	}
@@ -228,17 +358,10 @@ int main(int argc, char *argv[]) {
 	wlr_surface_attach_pixels(state.cat_texture, GL_RGB,
 		cat_tex.width, cat_tex.height, cat_tex.pixel_data);
 
-	bool done = false;
-	struct wl_event_source *timer = wl_event_loop_add_timer(event_loop,
-		timer_done, &done);
-
-	wl_event_source_timer_update(timer, 30000);
-
-	while (!done) {
+	while (!state.exit) {
 		wl_event_loop_dispatch(event_loop, 0);
 	}
 
-	wl_event_source_remove(timer);
 	wlr_backend_destroy(wlr);
 	wlr_session_finish(session);
 	wlr_surface_destroy(state.cat_texture);
diff --git a/example/simple.c b/example/simple.c
index 89f74330..331a0d08 100644
--- a/example/simple.c
+++ b/example/simple.c
@@ -162,12 +162,6 @@ void input_remove(struct wl_listener *listener, void *data) {
 	wl_list_remove(&kbstate->key.link);
 }
 
-static int timer_done(void *data) {
-	struct state *state = data;
-	state->exit = true;
-	return 1;
-}
-
 int main() {
 	struct state state = {
 		.color = { 1.0, 0.0, 0.0 },
@@ -225,10 +219,6 @@ int main() {
 	if (!wlr || !wlr_backend_init(wlr)) {
 		return 1;
 	}
-	struct wl_event_source *timer = wl_event_loop_add_timer(event_loop,
-		timer_done, &state);
-
-	wl_event_source_timer_update(timer, 30000);
 
 	while (!state.exit) {
 		wl_event_loop_dispatch(event_loop, 0);