Major speed up in rendering by only doing it when we move, but drawing the rendered 3d view texture constantly.

main_ui.cpp

@@ -65,13 +65,15 @@ namespace gui {
     $rayview.init_shaders();
     $rayview.set_position(RAY_VIEW_X, RAY_VIEW_Y);
     $rayview.position_camera($player.x + 0.5, $player.y + 0.5);
-
     $overlay_ui.render();
   }
 
   void MainUI::draw() {
     auto start = std::chrono::high_resolution_clock::now();
+
+    if($needs_render) $rayview.render();
     $rayview.draw($window);
+
     auto end = std::chrono::high_resolution_clock::now();
     auto elapsed = std::chrono::duration<double>(end - start);
     $stats.sample(1/elapsed.count());
@@ -85,16 +87,20 @@ namespace gui {
   }
 
   bool MainUI::play_rotate() {
-    return $camera.play_rotate($rayview);
+    bool done = $camera.play_rotate($rayview);
+    $needs_render = !done;
+    return done;
   }
 
   // this could be an optional that returs a Point
   std::optional<Point> MainUI::play_move() {
     if($camera.play_move($rayview)) {
+      $needs_render = false;
       return std::make_optional<Point>({
           size_t($camera.target_x),
           size_t($camera.target_y)});
     } else {
+      $needs_render = true;
       return std::nullopt;
     }
   }