example/main.c -> example/simple.c

1 files changed, 156 insertions, 0 deletions

diff --git a/example/simple.c b/example/simple.c
new file mode 100644
index 00000000..1f92bbe7
--- /dev/null
+++ b/example/simple.c
@@ -0,0 +1,156 @@
+#define _POSIX_C_SOURCE 199309L
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <wayland-server.h>
+#include <GLES3/gl3.h>
+#include <wlr/backend.h>
+#include <wlr/session.h>
+#include <wlr/types.h>
+
+struct state {
+	float color[3];
+	int dec;
+	struct timespec last_frame;
+	struct wl_listener output_add;
+	struct wl_listener output_remove;
+	struct wl_list outputs;
+};
+
+struct output_state {
+	struct wl_list link;
+	struct wlr_output *output;
+	struct state *state;
+	struct wl_listener frame;
+};
+
+void output_frame(struct wl_listener *listener, void *data) {
+	struct output_state *ostate = wl_container_of(listener, ostate, frame);
+	struct state *s = ostate->state;
+
+	struct timespec now;
+	clock_gettime(CLOCK_MONOTONIC, &now);
+
+	long ms = (now.tv_sec - s->last_frame.tv_sec) * 1000 +
+		(now.tv_nsec - s->last_frame.tv_nsec) / 1000000;
+	int inc = (s->dec + 1) % 3;
+
+	s->color[inc] += ms / 2000.0f;
+	s->color[s->dec] -= ms / 2000.0f;
+
+	if (s->color[s->dec] < 0.0f) {
+		s->color[inc] = 1.0f;
+		s->color[s->dec] = 0.0f;
+		s->dec = inc;
+	}
+
+	s->last_frame = now;
+
+	glClearColor(s->color[0], s->color[1], s->color[2], 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+}
+
+void output_add(struct wl_listener *listener, void *data) {
+	struct wlr_output *output = data;
+	struct state *state = wl_container_of(listener, state, output_add);
+	fprintf(stderr, "Output '%s' added\n", output->name);
+	wlr_output_set_mode(output, output->modes->items[0]);
+	struct output_state *ostate = calloc(1, sizeof(struct output_state));
+	ostate->output = output;
+	ostate->state = state;
+	ostate->frame.notify = output_frame;
+	wl_list_init(&ostate->frame.link);
+	wl_signal_add(&output->events.frame, &ostate->frame);
+	wl_list_insert(&state->outputs, &ostate->link);
+}
+
+void output_remove(struct wl_listener *listener, void *data) {
+	struct wlr_output *output = data;
+	struct 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
+	}
+	wl_list_remove(&ostate->link);
+	wl_list_remove(&ostate->frame.link);
+}
+
+int timer_done(void *data) {
+	*(bool *)data = true;
+	return 1;
+}
+
+int enable_outputs(void *data) {
+	struct state *state = data;
+	struct output_state *ostate;
+	wl_list_for_each(ostate, &state->outputs, link) {
+		struct wlr_output *output = ostate->output;
+		wlr_output_enable(output, true);
+	}
+	return 1;
+}
+
+int disable_outputs(void *data) {
+	struct state *state = data;
+	struct output_state *ostate;
+	wl_list_for_each(ostate, &state->outputs, link) {
+		struct wlr_output *output = ostate->output;
+		wlr_output_enable(output, false);
+	}
+	return 1;
+}
+
+int main() {
+	struct state state = {
+		.color = { 1.0, 0.0, 0.0 },
+		.dec = 0,
+		.output_add = { .notify = output_add },
+		.output_remove = { .notify = output_remove }
+	};
+
+	wl_list_init(&state.outputs);
+	wl_list_init(&state.output_add.link);
+	wl_list_init(&state.output_remove.link);
+	clock_gettime(CLOCK_MONOTONIC, &state.last_frame);
+
+	struct wl_display *display = wl_display_create();
+	struct wl_event_loop *event_loop = wl_display_get_event_loop(display);
+
+	struct wlr_session *session = wlr_session_start(display);
+	if (!session) {
+		return 1;
+	}
+
+	struct wlr_backend *wlr = wlr_backend_autocreate(display, session);
+	wl_signal_add(&wlr->events.output_add, &state.output_add);
+	wl_signal_add(&wlr->events.output_remove, &state.output_remove);
+	if (!wlr || !wlr_backend_init(wlr)) {
+		return 1;
+	}
+
+	bool done = false;
+	struct wl_event_source *timer = wl_event_loop_add_timer(event_loop,
+		timer_done, &done);
+	struct wl_event_source *timer_disable_outputs =
+		wl_event_loop_add_timer(event_loop, disable_outputs, &state);
+	struct wl_event_source *timer_enable_outputs =
+		wl_event_loop_add_timer(event_loop, enable_outputs, &state);
+
+	wl_event_source_timer_update(timer, 20000);
+	wl_event_source_timer_update(timer_disable_outputs, 5000);
+	wl_event_source_timer_update(timer_enable_outputs, 10000);
+
+	while (!done) {
+		wl_event_loop_dispatch(event_loop, 0);
+	}
+
+	wl_event_source_remove(timer);
+	wlr_backend_destroy(wlr);
+	wl_display_destroy(display);
+}