This implements base ambient lighting for tiles which helps with tiles like lava and ceiling lights.

lights.hpp

@@ -19,14 +19,10 @@ namespace lighting {
     size_t $width;
     size_t $height;
     Matrix $lightmap;
+    Matrix $ambient;
     Pathing $paths;
 
-    LightRender(size_t width, size_t height) :
-      $width(width),
-      $height(height),
-      $lightmap(height, matrix::Row(width, 0)),
-      $paths(width, height)
-    {}
+    LightRender(Matrix& walls);
 
     void reset_light();
     void set_light_target(const Point &at, int value=0);