Performance check showed that I was checking every sprite even if they're way far away so now just do ones near-ish.

main_ui.cpp

@@ -6,7 +6,6 @@ namespace gui {
 
   MainUI::MainUI(sf::RenderWindow& window) :
     $window(window),
-    $overlay_ui($level),
     $rayview(RAY_VIEW_WIDTH, RAY_VIEW_HEIGHT)
   {
     $window.setVerticalSyncEnabled(VSYNC);
@@ -37,6 +36,7 @@ namespace gui {
   void MainUI::draw_stats() {
     auto player = $level.world->get_the<Player>();
     auto player_combat = $level.world->get<Combat>(player.entity);
+    auto map = $level.map;
     std::string stats = fmt::format("STATS\n"
         "HP: {}\n"
         "mean:{:>8.5}\n"
@@ -44,12 +44,13 @@ namespace gui {
         "min: {:>8.5}\n"
         "max: {:>8.5}\n"
         "count:{:<10}\n\n"
+        "level: {} size: {}x{}\n\n"
         "VSync? {}\n"
         "FR Limit: {}\n"
         "Debug? {}\n\n",
         player_combat.hp, $stats.mean(), $stats.stddev(), $stats.min,
-        $stats.max, $stats.n, VSYNC,
+        $stats.max, $stats.n, $level.index, map->width(), map->height(),
-        FRAME_LIMIT, DEBUG_BUILD);
+        VSYNC, FRAME_LIMIT, DEBUG_BUILD);
 
     $overlay_ui.update_text("top_left", stats);
   }

overlay_ui.cpp

@@ -8,9 +8,7 @@ namespace gui {
   using namespace guecs;
   using std::string;
 
-  OverlayUI::OverlayUI(GameLevel level) :
+  OverlayUI::OverlayUI() {
-    $level(level)
-  {
     $gui.position(RAY_VIEW_X, RAY_VIEW_Y, RAY_VIEW_WIDTH, RAY_VIEW_HEIGHT);
     $gui.layout(
         "[top_left|top|top_right]"

overlay_ui.hpp

@@ -8,9 +8,8 @@ namespace gui {
   class OverlayUI {
     public:
       guecs::UI $gui;
-      GameLevel $level;
 
-      OverlayUI(GameLevel level);
+      OverlayUI();
 
       void render();
       void draw(sf::RenderWindow& window);

raycaster.cpp

@@ -75,7 +75,7 @@ void Raycaster::sprite_casting(sf::RenderTarget &target) {
   auto& lights = $level.lights->lighting();
 
   // sort sprites from far to close
-  auto sprite_order = $level.collision->distance_sorted({(size_t)$pos_x, (size_t)$pos_y});
+  auto sprite_order = $level.collision->distance_sorted({(size_t)$pos_x, (size_t)$pos_y}, 500);
 
   // after sorting the sprites, do the projection
   for(auto& rec : sprite_order) {

spatialmap.cpp

@@ -65,7 +65,7 @@ FoundEntities SpatialMap::neighbors(Point cell, bool diag) const {
   return {!result.empty(), result};
 }
 
-SortedEntities SpatialMap::distance_sorted(Point from) {
+SortedEntities SpatialMap::distance_sorted(Point from, int max_dist) {
   SortedEntities sprite_distance;
 
   for(const auto &rec : table) {
@@ -73,7 +73,9 @@ SortedEntities SpatialMap::distance_sorted(Point from) {
     int inside = (from.x - sprite.x) * (from.x - sprite.x) +
         (from.y - sprite.y) * (from.y - sprite.y);
 
-    sprite_distance.push_back({inside, rec.second});
+    if(inside < max_dist) {
+      sprite_distance.push_back({inside, rec.second});
+    }
   }
 
   std::sort(sprite_distance.begin(), sprite_distance.end(), std::greater<>());

spatialmap.hpp

@@ -28,6 +28,6 @@ class SpatialMap {
     DinkyECS::Entity get(Point at) const;
     FoundEntities neighbors(Point position, bool diag=false) const;
 
-    SortedEntities distance_sorted(Point from);
+    SortedEntities distance_sorted(Point from, int max_distance);
     size_t size() { return table.size(); }
 };

tests/spatialmap.cpp

@@ -152,7 +152,7 @@ TEST_CASE("confirm can iterate through all", "[spatialmap-sort]") {
       collider.insert({x,y}, ent);
     }
 
-    auto sprite_distance = collider.distance_sorted(player);
+    auto sprite_distance = collider.distance_sorted(player, 10000);
 
     int prev_dist = sprite_distance[0].first;