From e91fb33a8986368a3363f5a2446e9a4b52a82273 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <tastyfish@seznam.cz>
Date: Mon, 17 Sep 2018 13:03:35 +0200
Subject: [PATCH] Add floor mirror

---
 demo2.cpp | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/demo2.cpp b/demo2.cpp
index 88c708f..e393650 100644
--- a/demo2.cpp
+++ b/demo2.cpp
@@ -31,6 +31,9 @@
 //#define NO_SHADING
   /* ^ Turns off shading (fog) which increases FPS. */
 
+//#define NO_MIRROR
+  /* ^ Turns off the floor mirror effect, which should increase FPS. */
+
 //#define USE_DIST_APPROX 1 
   /* ^ Turns on distance approximation, which won't compute exact distances but
        only approximations - this should increase performance a little, but
@@ -925,6 +928,8 @@ bool shotFired = false;
 uint8_t previousColumn = 255; ///< Helper for pixelIntensity.
 int8_t pixelIntensity = 0; ///< Precomputed column intensity addition.
 
+int16_t mirror = 0;
+
 /**
   Function for drawing a single pixel (like fragment shader).
 */
@@ -935,9 +940,25 @@ inline void pixelFunc(PixelInfo *pixel)
 
   uint8_t c = 0;
 
+#ifndef NO_MIRROR
+  if (pixel->position.y == 0)
+    mirror = 0;
+#endif
+  
   if (!pixel->isWall)
   {
     c = pixel->isFloor ? cFloor: cCeiling;
+
+#ifndef NO_MIRROR
+    int16_t intensity =  pixel->isFloor ?
+      -1 * (pixel->depth - mirror * 64) / UNITS_PER_SQUARE : 0;
+#else
+    int16_t intensity = -1 * pixel->depth / (UNITS_PER_SQUARE * 2);
+#endif
+
+    c = addIntensity(c,intensity);
+
+    mirror++;
   }
   else
   {
@@ -1006,8 +1027,8 @@ int main()
   for (uint8_t i = 0; i < TEXTURES; ++i)
     textureAverageColors[i] = computeAverageColor(textures[i]);
 
-  cFloor = rgbToIndex(0,1,1);
-  cCeiling = rgbToIndex(1,0,1);
+  cFloor = rgbToIndex(3,3,2);
+  cCeiling = rgbToIndex(3,2,0);
 
   player.setPositionSquare(6,5);
   player.mCamera.height = CAMERA_COLL_HEIGHT_BELOW;