Bring in the gnu omni font for text, and rewrite my stats code to use c++ and then use that to calc FPS stats for an FPS display on the left. Debug build gets about 48, release gets about 500fps. Amit's code will probably do even better.

main.cpp

@@ -4,6 +4,7 @@
 #include <numeric>
 #include <functional>
 #include "constants.hpp"
+#include "stats.hpp"
 
 Matrix MAP{
   {1,1,1,1,1,1,1,1,1},
@@ -17,16 +18,27 @@ Matrix MAP{
   {1,1,1,1,1,1,1,1,1}
 };
 
-void draw_gui(sf::RenderWindow &window) {
+void draw_gui(sf::RenderWindow &window, sf::Text &text, Stats &stats) {
   sf::RectangleShape rect({SCREEN_WIDTH - RAY_VIEW_WIDTH, SCREEN_HEIGHT});
+
   rect.setPosition({0,0});
-  rect.setFillColor({100, 100, 100});
+  rect.setFillColor({50, 50, 50});
   window.draw(rect);
+
+  text.setString(
+    fmt::format("FPS\nmean:{:>8.5}\nsdev: {:>8.5}\nmin: {:>8.5}\nmax: {:>8.5}\ncount:{:<10}\n\nHit R to reset.",
+      stats.mean(), stats.stddev(), stats.min, stats.max, stats.n));
+  window.draw(text);
 }
 
 int main() {
   sf::RenderWindow window(sf::VideoMode({SCREEN_WIDTH, SCREEN_HEIGHT}), "Zed's Ray Caster Game Thing");
 
+  sf::Font font{"./assets/text.otf"};
+  sf::Text text{font};
+  text.setFillColor({255,255,255});
+  text.setPosition({10,10});
+
   //ZED this should set with a function
   float player_x = matrix::width(MAP) / 2;
   float player_y = matrix::height(MAP) / 2;
@@ -43,9 +55,16 @@ int main() {
       window.close();
   };
 
+  Stats stats;
+
   while(window.isOpen()) {
+    auto start = std::chrono::high_resolution_clock::now();
     rayview.render();
-    draw_gui(window);
+    auto end = std::chrono::high_resolution_clock::now();
+    auto elapsed = std::chrono::duration<double>(end - start);
+    stats.sample(1/elapsed.count());
+
+    draw_gui(window, text, stats);
     window.display();
     rayview.rotate(rotSpeed, -1);
 
@@ -61,6 +80,10 @@ int main() {
       rayview.rotate(rotSpeed, 1);
     }
 
+    if(sf::Keyboard::isKeyPressed(sf::Keyboard::Key::R)) {
+      stats.reset();
+    }
+
     window.handleEvents(onClose);
   }