From c45ec454571f36286de25ce93e37f3f033455f42 Mon Sep 17 00:00:00 2001
From: Gary Talent <gtalent2@gmail.com>
Date: Thu, 19 Mar 2020 02:07:25 -0500
Subject: [PATCH] [nostalgia/core/sdl] Add disabled FPS logging

---
 src/nostalgia/core/sdl/gfx.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/nostalgia/core/sdl/gfx.cpp b/src/nostalgia/core/sdl/gfx.cpp
index 3d3e2eb5..828f750a 100644
--- a/src/nostalgia/core/sdl/gfx.cpp
+++ b/src/nostalgia/core/sdl/gfx.cpp
@@ -8,6 +8,9 @@
 
 #include <array>
 #include <vector>
+#ifdef NOST_FPS_PRINT
+#include <iostream>
+#endif
 
 #include <SDL.h>
 
@@ -150,7 +153,23 @@ void drawBackground(const TileMap &tm, SDL_Texture *tex) {
 	}
 }
 
+#ifdef NOST_FPS_PRINT
+static uint64_t prevFpsCheckTime = 0;
+static uint64_t draws = 0;
+#endif
+
 void draw() {
+#ifdef NOST_FPS_PRINT
+	++draws;
+	if (draws >= 5000) {
+		using namespace std::chrono;
+		auto now = duration_cast<milliseconds>(system_clock::now().time_since_epoch()).count();
+		auto duration = static_cast<double>(now - prevFpsCheckTime) / 1000.0;
+		std::cout << "FPS: " << static_cast<int>(static_cast<double>(draws) / duration) << '\n';
+		prevFpsCheckTime = now;
+		draws = 0;
+	}
+#endif
 	SDL_RenderClear(renderer);
 	for (std::size_t i = 0; i < bgTileMaps.size(); i++) {
 		auto tex = bgTextures[i];