1 files changed, 52 insertions, 0 deletions
diff --git a/src/main.cpp b/src/main.cpp
index 9af2736..1e43d76 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -33,6 +33,58 @@ ntime_t nclock(void)
 	       std::chrono::nanoseconds(1) - nclock_ref;
 }
 
+freq_counter_t::freq_counter_t(size_t num_samples_)
+{
+	num_samples = num_samples_;
+	samples = (ntime_t*)malloc(sizeof(ntime_t) * num_samples);
+}
+
+freq_counter_t::~freq_counter_t(void)
+{
+	free(samples);
+}
+
+void freq_counter_t::push(ntime_t sample)
+{
+	collected++;
+	samples[collected % num_samples] = sample;
+}
+
+void freq_counter_t::tick(void)
+{
+	ntime_t now = nclock();
+
+	if (last_tick)
+		push(now - last_tick);
+
+	last_tick = now;
+}
+
+float freq_counter_t::freq_ma(void)
+{
+	ntime_t now;
+	float res = 0.0f;
+	size_t to_count;
+
+	now = nclock();
+
+	if (last_ma_time && now - last_ma_time < 500000000)
+		return last_ma;
+
+	to_count = std::min(collected, num_samples);
+
+	for (size_t i = 0; i < to_count; i++)
+		res += samples[i] * 1.0e-9f;
+	res = 1.0f / (res / to_count);
+
+	last_ma_time = now;
+	last_ma = res;
+	return res;
+}
+
+freq_counter_t fc_render = freq_counter_t(20);
+freq_counter_t fc_game = freq_counter_t(10);
+
 int main()
 {
 	nclock_ref = nclock() - 1;