Now I can attach arbitrary shaders to sprites based on things that happen in the world.

raycaster.hpp

@@ -13,7 +13,6 @@ struct Raycaster {
   int $pitch=0;
   sf::Clock $clock;
   std::shared_ptr<sf::Shader> $brightness = nullptr;
-  std::shared_ptr<sf::Shader> $flame = nullptr;
   double $pos_x = 0;
   double $pos_y = 0;