Bring back a simple blood splatter texture.

main_ui.cpp

@@ -42,7 +42,6 @@ namespace gui {
   }
 
   void MainUI::render() {
-
     if($show_level) {
       auto time = $clock.getElapsedTime();
       auto st = textures::get("down_the_well");
@@ -60,6 +59,10 @@ namespace gui {
     $overlay_ui.render($window);
   }
 
+  void MainUI::health_low() {
+    $overlay_ui.show_sprite("middle", "blood_splatter");
+  }
+
   bool MainUI::play_rotate() {
     bool done = $camera.play_rotate($rayview);
     $needs_render = !done;

main_ui.hpp

@@ -45,6 +45,7 @@ namespace gui {
     void dirty();
 
     void show_level();
+    void health_low();
     void dead_entity(DinkyECS::Entity entity);
   };
 }