Implemented a dumb lighting system.

raycaster.cpp

@@ -1,9 +1,32 @@
 #include "raycaster.hpp"
 #include "texture.hpp"
+#include <algorithm>
 
 using namespace fmt;
 using std::make_unique;
 
+union ColorConv {
+  struct {
+    uint8_t r;
+    uint8_t g;
+    uint8_t b;
+    uint8_t a;
+  } as_color;
+  uint32_t as_int;
+};
+
+inline uint32_t dumb_lighting(uint32_t pixel, double distance) {
+  if(distance < 0.9) return pixel;
+
+  ColorConv conv{.as_int=pixel};
+  conv.as_color.r /= distance;
+  conv.as_color.g /= distance;
+  conv.as_color.b /= distance;
+
+  return conv.as_int;
+}
+
+
 Raycaster::Raycaster(sf::RenderWindow& window, Matrix &map, int width, int height) :
   $width(width), $height(height),
   $window(window),
@@ -226,7 +249,7 @@ void Raycaster::cast_rays() {
       int texY = (int)texPos & (textures.TEXTURE_HEIGHT - 1);
       texPos += step;
       RGBA pixel = texture[textures.TEXTURE_HEIGHT * texY + texX];
-      pixels[pixcoord(x, y)] = pixel;
+      pixels[pixcoord(x, y)] = dumb_lighting(pixel, perpWallDist);
     }
 
     // SET THE ZBUFFER FOR THE SPRITE CASTING