Trying a new 'glowing moss' texture to sort out how to make the raycaster alter the light of a surface that has its own light.

shiterator.hpp

@@ -533,6 +533,32 @@ namespace shiterator { using std::vector, std::queue, std::array; using
     }
   };
 
+  /*
+   * Same as rando_rect_t but it uses a centered box.
+   */
+  template<typename MAT>
+  struct rando_box_t {
+    size_t x;
+    size_t y;
+    size_t x_offset;
+    size_t y_offset;
+    box_t<MAT> it;
+
+    rando_box_t(MAT &mat, size_t start_x, size_t start_y, size_t size) :
+      it{mat, start_x, start_y, size}
+    {
+      x_offset = Random::uniform(size_t(0), it.right);
+      y_offset = Random::uniform(size_t(0), it.bottom);
+    }
+
+    bool next() {
+      bool done = it.next();
+      x = it.left + ((it.x + x_offset) % it.right);
+      y = it.top + ((it.y + y_offset) % it.bottom);
+      return done;
+    }
+  };
+
   /*
    * WIP:  This one is used to place entities randomly but
    * could be used for effects like random destruction of floors.