[render-test] Implement fps benchmarking tests (#15803)

1 files changed, 24 insertions, 0 deletions

diff --git a/platform/default/src/mbgl/util/monotonic_timer.cpp b/platform/default/src/mbgl/util/monotonic_timer.cpp
new file mode 100644
index 0000000000..43c2ce6717
--- /dev/null
+++ b/platform/default/src/mbgl/util/monotonic_timer.cpp
@@ -0,0 +1,24 @@
+#include <assert.h>
+#include <chrono>
+#include <mbgl/util/monotonic_timer.hpp>
+
+namespace mbgl {
+namespace util {
+
+// Prefer high resolution timer if it is monotonic
+template <typename T, std::enable_if_t<std::chrono::high_resolution_clock::is_steady, T>* = nullptr>
+static T sample() {
+    return std::chrono::duration_cast<T>(std::chrono::high_resolution_clock::now().time_since_epoch());
+}
+
+template <typename T, std::enable_if_t<!std::chrono::high_resolution_clock::is_steady, T>* = nullptr>
+static T sample() {
+    return std::chrono::duration_cast<T>(std::chrono::steady_clock::now().time_since_epoch());
+}
+
+std::chrono::duration<double> MonotonicTimer::now() {
+    return sample<std::chrono::duration<double>>();
+}
+
+} // namespace util
+} // namespace mbgl
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