added more scene dependencies, added tinywl

1 files changed, 32 insertions, 0 deletions

diff --git a/util/time.c b/util/time.c
new file mode 100644
index 0000000..06e42b4
--- /dev/null
+++ b/util/time.c
@@ -0,0 +1,32 @@
+#define _POSIX_C_SOURCE 200809L
+#include <stdint.h>
+#include <time.h>
+
+#include "util/time.h"
+
+static const long NSEC_PER_SEC = 1000000000;
+
+int64_t timespec_to_msec(const struct timespec *a) {
+	return (int64_t)a->tv_sec * 1000 + a->tv_nsec / 1000000;
+}
+
+void timespec_from_nsec(struct timespec *r, int64_t nsec) {
+	r->tv_sec = nsec / NSEC_PER_SEC;
+	r->tv_nsec = nsec % NSEC_PER_SEC;
+}
+
+uint32_t get_current_time_msec(void) {
+	struct timespec now;
+	clock_gettime(CLOCK_MONOTONIC, &now);
+	return timespec_to_msec(&now);
+}
+
+void timespec_sub(struct timespec *r, const struct timespec *a,
+		const struct timespec *b) {
+	r->tv_sec = a->tv_sec - b->tv_sec;
+	r->tv_nsec = a->tv_nsec - b->tv_nsec;
+	if (r->tv_nsec < 0) {
+		r->tv_sec--;
+		r->tv_nsec += NSEC_PER_SEC;
+	}
+}