From d1458632e9a275dc6edbe4a364c1a545e76b6a6d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <tastyfish@seznam.cz>
Date: Mon, 3 Sep 2018 14:31:29 +0200
Subject: [PATCH] Add fog

---
 game.cpp | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/game.cpp b/game.cpp
index 51d7851..efc58e5 100644
--- a/game.cpp
+++ b/game.cpp
@@ -110,6 +110,24 @@ inline uint8_t rgbToIndex(uint8_t r, uint8_t g, uint8_t b)
   return (r & 0b00000111) | ((g & 0b00000111) << 3) | ((b & 0b00000011) << 6);
 }
 
+inline uint8_t darkenColor(uint8_t color, uint8_t intensity)
+{
+  uint8_t r = color & 0b00000111;
+  uint8_t g = (color & 0b00111000) >> 3;
+  uint8_t b = (color & 0b11000000) >> 6;
+
+  r += intensity;
+  r = r > 7 ? 7 : r;
+
+  g += intensity;
+  g = g > 7 ? 7 : g;
+
+  b += intensity / 2;
+  b = b > 3 ? 3 : b;
+
+  return rgbToIndex(r,g,b);
+}
+
 class Level
 {
 public:
@@ -196,10 +214,10 @@ if (pixel.isWall)
 
   if (intensity < 0)
     intensity = 0;
-}
 
-if (pixel.isWall)
   c = sampleImage(image,pixel.hit.textureCoord,pixel.textureCoordY);
+  c = darkenColor(c,intensity);
+}
 else
   c = rgbToIndex(intensity,intensity,intensity / 2);