First cut of pulling out the relevant parts of my original game to make a little framework.

src/graphics/lights.hpp

@@ -0,0 +1,40 @@
+#pragma once
+#include <array>
+#include "dbc.hpp"
+#include "algos/point.hpp"
+#include <algorithm>
+#include "algos/matrix.hpp"
+#include "algos/pathing.hpp"
+#include "game/components.hpp"
+
+namespace lighting {
+  using components::LightSource;
+
+  // THESE ARE PERCENTAGES!
+  const int MIN = 20;
+  const int BOOST = 10;
+
+  class LightRender {
+    public:
+    size_t $width;
+    size_t $height;
+    Matrix $lightmap;
+    Matrix $ambient;
+    Pathing $paths;
+    matrix::Matrix $fow;
+
+    LightRender(Matrix& walls);
+
+    void reset_light();
+    void set_light_target(const Point &at, int value=0);
+    void clear_light_target(const Point &at);
+    void path_light(Matrix &walls);
+    void light_box(LightSource source, Point from, Point &min_out, Point &max_out);
+    int light_level(int level, float distance, size_t x, size_t y);
+    void render_light(LightSource source, Point at);
+    void render_square_light(LightSource source, Point at, PointList &has_light);
+    void update_fow(Point player_pos, LightSource source);
+    Matrix &lighting() { return $lightmap; }
+    Matrix &paths() { return $paths.paths(); }
+  };
+}