X-Git-Url: https://git.sesse.net/?p=cubemap;a=blobdiff_plain;f=timespec.cpp;fp=timespec.cpp;h=66fa26a061d2bb985131fcbbe964be7d3b2d97e7;hp=0000000000000000000000000000000000000000;hb=b1b81d8f5492e48a60f0ed2930a098747928e5c4;hpb=8077fd7663c0e79e4d42c9db55be1de02027a17d

diff --git a/timespec.cpp b/timespec.cpp
new file mode 100644
index 0000000..66fa26a
--- /dev/null
+++ b/timespec.cpp
@@ -0,0 +1,28 @@
+#include <assert.h>
+#include <sys/time.h>
+
+#include "timespec.h"
+
+timespec clock_diff(const timespec &a, const timespec &b)
+{
+	timespec ret;
+	ret.tv_sec = b.tv_sec - a.tv_sec;
+	ret.tv_nsec = b.tv_nsec - a.tv_nsec;
+	if (ret.tv_nsec < 0) {
+		ret.tv_sec--;
+		ret.tv_nsec += 1000000000;
+	}
+	assert(ret.tv_nsec >= 0);
+	return ret;
+}
+
+timespec clock_add(const timespec &a, const timespec &b)
+{
+	timespec ret;
+	ret.tv_sec = a.tv_sec + b.tv_sec;
+	ret.tv_nsec = b.tv_nsec + b.tv_nsec;
+
+	ret.tv_sec += ret.tv_nsec / 1000000000;
+	ret.tv_nsec %= 1000000000;
+	return ret;
+}