Can now see an enemy take damage, and a damage number, but the effect is inverted.

scene.cpp

@@ -1,6 +1,7 @@
 #include "scene.hpp"
 #include "animation.hpp"
 #include <ranges>
+#include "shaders.hpp"
 
 const bool DEBUG=false;
 
@@ -27,7 +28,7 @@ namespace scene {
 
       sf::Text text(*$ui.$font, "", 60);
 
-      return {name, st, anim, cell, scale_x, scale_y, x, y, at_mid, flipped, text};
+      return {name, st, anim, cell, scale_x, scale_y, x, y, at_mid, flipped, nullptr, text};
   }
 
   Engine::Engine(components::AnimatedScene& scene) :
@@ -70,6 +71,11 @@ namespace scene {
     }
   }
 
+  void Engine::apply_effect(const std::string& actor, const std::string& shader) {
+    auto& element = actor_config(actor);
+    element.effect = shaders::get(shader);
+  }
+
   void Engine::attach_text(const std::string& actor, const std::string& text) {
     auto& element = actor_config(actor);
     element.text.setPosition(element.pos);
@@ -88,15 +94,14 @@ namespace scene {
     $ui.render(window);
 
     for(auto& fixture : $fixtures) {
-      window.draw(*fixture.st.sprite);
+      window.draw(*fixture.st.sprite, fixture.effect.get());
     }
 
     for(auto& actor : $actors) {
-       window.draw(*actor.st.sprite);
+       window.draw(*actor.st.sprite, actor.effect.get());
        if(actor.anim.playing) window.draw(actor.text);
     }
 
-
     if(DEBUG) $ui.debug_layout(window);
   }
 
@@ -119,6 +124,8 @@ namespace scene {
     for(auto& fixture : $fixtures) {
       if(fixture.anim.playing) {
         fixture.anim.apply(*fixture.st.sprite, fixture.pos);
+      } else {
+        fixture.effect = nullptr;
       }
     }
 
@@ -126,6 +133,12 @@ namespace scene {
       if(actor.anim.playing) {
         actor.anim.apply(*actor.st.sprite, actor.pos);
         actor.anim.apply(actor.text, actor.pos);
+        if(actor.effect) {
+          actor.effect->setUniform("u_time", actor.anim.subframe);
+          actor.effect->setUniform("u_duration", 1000);
+        }
+      } else {
+        actor.effect = nullptr;
       }
     }
   }