Android rayshader sample.

samples/android_sample/jni/timer.cc

+#include "jni/timer.h"
+#include "bin/log.h"
+
+Timer::Timer() : elapsed_(0.0f), last_time_(0.0) {
+}
+
+void Timer::reset() {
+  elapsed_ = 0.0f;
+  last_time_ = now();
+}
+
+void Timer::update() {
+  double current = now();
+  elapsed_ = (current - last_time_);
+  last_time_ = current;
+}
+
+double Timer::now() {
+  timespec timeval;
+  clock_gettime(CLOCK_MONOTONIC, &timeval);
+  return timeval.tv_sec + (timeval.tv_nsec * 1.0e-9);
+}
+
+float Timer::elapsed() {
+  return elapsed_;
+}
+