examples: add output-power-management example client

examples/meson.build

@@ -81,6 +81,11 @@ clients = {
 		'dep': [wayland_cursor, math],
 		'proto': ['wlr-gamma-control-unstable-v1'],
 	},
+	'output-power-management': {
+		'src': 'output-power-management.c',
+		'dep': [wayland_client, wlroots],
+		'proto': ['wlr-output-power-management-unstable-v1'],
+	},
 	'pointer-constraints': {
 		'src': 'pointer-constraints.c',
 		'dep': wlroots,

examples/output-power-management.c

@@ -0,0 +1,134 @@
+#define _POSIX_C_SOURCE 200809L
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <wayland-client-protocol.h>
+#include <wayland-client.h>
+#include "wlr-output-power-management-unstable-v1-client-protocol.h"
+
+struct output {
+	struct wl_output *wl_output;
+	struct zwlr_output_power_v1 *output_power;
+	struct wl_list link;
+};
+
+static struct wl_list outputs;
+static struct zwlr_output_power_manager_v1 *output_power_manager = NULL;
+
+static void output_power_handle_mode(void *data,
+		struct zwlr_output_power_v1 *output_power,
+		enum zwlr_output_power_v1_mode mode) {
+	struct output *output = data;
+
+	switch (mode) {
+	case ZWLR_OUTPUT_POWER_V1_MODE_OFF:
+		printf("Output %p disabled\n", output);
+		break;
+	case ZWLR_OUTPUT_POWER_V1_MODE_ON:
+		printf("Output %p enabled\n", output);
+		break;
+	}
+}
+
+static void output_power_handle_failed(void *data,
+		struct zwlr_output_power_v1 *output_power) {
+	fprintf(stderr, "failed to set output power mode\n");
+	exit(EXIT_FAILURE);
+}
+
+static const struct zwlr_output_power_v1_listener output_power_listener = {
+	.mode = output_power_handle_mode,
+	.failed = output_power_handle_failed,
+};
+
+static void registry_handle_global(void *data, struct wl_registry *registry,
+		uint32_t name, const char *interface, uint32_t version) {
+	if (strcmp(interface, wl_output_interface.name) == 0) {
+		struct output *output = calloc(1, sizeof(struct output));
+		output->wl_output = wl_registry_bind(registry, name,
+			&wl_output_interface, 1);
+		wl_list_insert(&outputs, &output->link);
+	} else if (strcmp(interface,
+			zwlr_output_power_manager_v1_interface.name) == 0) {
+		output_power_manager = wl_registry_bind(registry, name,
+			&zwlr_output_power_manager_v1_interface, 1);
+	}
+}
+
+static void registry_handle_global_remove(void *data,
+		struct wl_registry *registry, uint32_t name) {
+	// Who cares?
+}
+
+static const struct wl_registry_listener registry_listener = {
+	.global = registry_handle_global,
+	.global_remove = registry_handle_global_remove,
+};
+
+static const char usage[] = "usage: output-power-management [options...]\n"
+	"  -h: show this help message\n"
+	"  -e: turn outputs on\n"
+	"  -d: turn outputs off\n";
+
+int main(int argc, char *argv[]) {
+	wl_list_init(&outputs);
+
+	int opt;
+	enum zwlr_output_power_v1_mode mode =
+		ZWLR_OUTPUT_POWER_V1_MODE_ON;
+	while ((opt = getopt(argc, argv, "edh")) != -1) {
+		switch (opt) {
+		case 'e':
+			mode = ZWLR_OUTPUT_POWER_V1_MODE_ON;
+			break;
+		case 'd':
+			mode = ZWLR_OUTPUT_POWER_V1_MODE_OFF;
+			break;
+		case 'h':
+		default:
+			fprintf(stderr, usage);
+			return opt == 'h' ? EXIT_SUCCESS : EXIT_FAILURE;
+		}
+	}
+
+	struct wl_display *display = wl_display_connect(NULL);
+	if (display == NULL) {
+		fprintf(stderr, "failed to create display\n");
+		return -1;
+	}
+
+	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);
+
+	if (output_power_manager == NULL) {
+		fprintf(stderr,
+			"compositor doesn't support wlr-output-power-managment-unstable-v1\n");
+		return EXIT_FAILURE;
+	}
+
+	struct output *output;
+	wl_list_for_each(output, &outputs, link) {
+		output->output_power = zwlr_output_power_manager_v1_get_output_power(
+			output_power_manager, output->wl_output);
+		zwlr_output_power_v1_add_listener(output->output_power,
+			&output_power_listener, output);
+	}
+	wl_display_roundtrip(display);
+
+	wl_list_for_each(output, &outputs, link) {
+		zwlr_output_power_v1_set_mode(output->output_power,
+			mode);
+	}
+
+	while (wl_display_dispatch(display) != -1) {
+		// nothing to see here, please move along
+	}
+
+	return EXIT_SUCCESS;
+}