4 files changed, 29 insertions, 51 deletions

diff --git a/src/common.hpp b/src/common.hpp
index f4ce9ff..ae4deed 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -48,21 +48,13 @@ ntime_t nclock(void);
 #define MSEC(x) ((ntime_t)x * 1000000)
 
 class freq_counter_t {
-	ntime_t *samples;
-	size_t num_samples, collected = 0;
-	ntime_t last_tick = 0;
-
-	float last_ma;
-	ntime_t last_ma_time = 0;
-
-	void push(ntime_t sample);
+	size_t ticks;
+	ntime_t t0 = 0;
+	float last_reading;
 
 public:
-	freq_counter_t(size_t num_samples_);
-	~freq_counter_t(void);
-
 	void tick(void);
-	float freq_ma(void);
+	float read(ntime_t ival);
 };
 
 extern freq_counter_t fc_render;
diff --git a/src/game/game.cpp b/src/game/game.cpp
index bc8d3c7..185e2d1 100644
--- a/src/game/game.cpp
+++ b/src/game/game.cpp
@@ -307,7 +307,7 @@ void state_t::resume(void)
 }
 
 #define TIME_DELTA ((ntime_t)1000000000 / 100)
-#define TIME_LIMIT ((ntime_t)1000000000 / 10)
+#define TIME_LIMIT ((ntime_t)1000000000 / 20)
 
 void state_t::tick(ntime_t time_)
 {
@@ -344,7 +344,15 @@ void state_t::tick(ntime_t time_)
 		fc_game.tick();
 
 		if (nclock() - time_ > TIME_LIMIT) {
-			frames_behind += target - frames_since_t0;
+			size_t left;
+
+			left = target - frames_since_t0;
+			t0 = nclock();
+			frames_since_t0 = 0;
+			frames_behind++;
+
+			interface->print("(Lag: " + std::to_string(left) + ")");
+
 			break;
 		}
 	}
diff --git a/src/game/interface.cpp b/src/game/interface.cpp
index 5b2d7b8..5872d17 100644
--- a/src/game/interface.cpp
+++ b/src/game/interface.cpp
@@ -381,7 +381,7 @@ void state_t::render_to(render::state_t *render)
 	x[1] -= em;
 	ss.str(std::string());
 	ss << std::fixed << std::setprecision(1);
-	ss << "FPS: " << fc_render.freq_ma() << ", " << fc_game.freq_ma() << " Hz";
+	ss << "FPS: " << fc_render.read(SEC(1)) << ", " << fc_game.read(SEC(1)) << " Hz";
 	render->render_text(x, em, ss.str(), render::ALIGN_LEFT_TOP, sf::Color::White);
 
 	x[1] -= em;
diff --git a/src/main.cpp b/src/main.cpp
index cb6d753..f0b6906 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -38,57 +38,35 @@ 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);
+	if (!t0)
+		t0 = nclock();
 
-	last_tick = now;
+	ticks++;
 }
 
-float freq_counter_t::freq_ma(void)
+float freq_counter_t::read(ntime_t ival)
 {
 	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;
+	if (!t0)
+		return 0.0f;
 
-	to_count = std::min(collected, num_samples);
+	if (now - t0 < ival)
+		return last_reading;
 
-	for (size_t i = 0; i < to_count; i++)
-		res += samples[i] * 1.0e-9f;
-	res = 1.0f / (res / to_count);
+	last_reading = ticks / (float)(now - t0) * 1.0e+9f;
+	t0 = now;
+	ticks = 0;
 
-	last_ma_time = now;
-	last_ma = res;
-	return res;
+	return last_reading;
 }
 
-freq_counter_t fc_render = freq_counter_t(20);
-freq_counter_t fc_game = freq_counter_t(10);
+freq_counter_t fc_render = freq_counter_t();
+freq_counter_t fc_game = freq_counter_t();
 
 #ifdef CONFIG_SHOW_RSS
 size_t sys_get_rss(void)