Add setting (fog)

TODO.txt

@@ -0,0 +1,12 @@
+- port to GB Meta
+- custom font
+- GUI
+- menu
+- sounds (music?)
+- level 2D map (with revealing, bitmap), special key for quick displaying map
+- save/load (optional)
+- enemies
+- weapons
+- more levels
+- disable transparency for walls for performance (setting)?
+- replace textures in distace with constant color for performance (setting)?

main.c

@@ -346,7 +346,9 @@ void SFG_pixelFunc(RCL_PixelInfo *pixel)
     shadow += pixel->depth / (RCL_UNITS_PER_SQUARE * 2);
 #endif
 
+#if SFG_ENABLE_FOG
     color = palette_minusValue(color,shadow);
+#endif
   }
   else
   {

settings.h

@@ -85,4 +85,11 @@
 */
 #define SFG_RAYCASTING_SUBSAMPLE 1
 
+/**
+  Enables or disables fog (darkness) due to distance. Recommended to keep on
+  for good look, but can be turned off for performance.
+*/
+
+#define SFG_ENABLE_FOG 1
+
 #endif // guard