From 8435ddadcaef8a799545a16a2d37bde9e9666204 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <tastyfish@seznam.cz>
Date: Wed, 5 Sep 2018 19:08:38 +0200
Subject: [PATCH] Separate ceilings

---
 raycastlib.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/raycastlib.h b/raycastlib.h
index f7ca961..08728d9 100644
--- a/raycastlib.h
+++ b/raycastlib.h
@@ -108,7 +108,8 @@ typedef struct
 typedef struct
 {
   Vector2D position;  ///< On-screen position.
-  int8_t isWall;      ///< Whether the pixel is a wall or a floor(/ceiling).
+  int8_t isWall;      ///< Whether the pixel is a wall or a floor/ceiling.
+  int8_t isFloor;     ///< Whether the pixel is floor or ceiling.
   Unit depth;         ///< Corrected depth.
   HitResult hit;      ///< Corresponding ray hit.
   Unit textureCoordY; ///< Normalized (0 to UNITS_PER_SQUARE - 1) tex coord.
@@ -691,6 +692,7 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
     // draw floor until wall
 
     p.isWall = 0;
+    p.isFloor = 1;
 
     Unit floorCameraDiff = absVal(worldZPrev) * VERTICAL_DEPTH_MULTIPLY;
 
@@ -703,6 +705,8 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
 
     // draw ceiling until wall
 
+    p.isFloor = 0;
+
     if (_ceilFunction != 0)
     {
       Unit ceilCameraDiff = absVal(worldZPrevCeil) * VERTICAL_DEPTH_MULTIPLY;
@@ -719,6 +723,7 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
 
     p.isWall = 1;
     p.depth = dist;
+    p.isFloor = 1;
 
     int_maybe32_t iTo = y2 < zTop ? zTop : y2;
 
@@ -736,6 +741,8 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
 
     // draw ceiling wall
 
+    p.isFloor = 0;
+
     if (_ceilFunction != 0)
     {
       iTo = y > zBottomCeil ? zBottomCeil : y;
@@ -767,6 +774,7 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
   // draw floor until horizon
 
   p.isWall = 0;
+  p.isFloor = 1;
 
   Unit floorCameraDiff = absVal(worldZPrev) * VERTICAL_DEPTH_MULTIPLY;
   Unit horizon = (y2 < _middleRow || _ceilFunction == 0) ? _middleRow : y2;
@@ -783,6 +791,8 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
 
   if (_ceilFunction != 0)
   {
+    p.isFloor = 0;
+
     Unit ceilCameraDiff = absVal(worldZPrevCeil) * VERTICAL_DEPTH_MULTIPLY;
     horizon = y > _middleRow ? _middleRow : y;