From cc6e9c69f40b85d8ad40cfd481808b27e5a9153a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <tastyfish@seznam.cz>
Date: Thu, 27 Sep 2018 12:39:30 +0200
Subject: [PATCH] Fix U wall texture

---
 raycastlib.h | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/raycastlib.h b/raycastlib.h
index c0efc19..ae5e593 100644
--- a/raycastlib.h
+++ b/raycastlib.h
@@ -883,7 +883,6 @@ void RCL_castRayMultiHit(RCL_Ray ray, RCL_ArrayFunction arrayFunc,
         RCL_Unit diff = h.position.x - ray.start.x;
         h.position.y = ray.start.y + ((ray.direction.y * diff) /
           RCL_nonZero(ray.direction.x)); 
-        h.textureCoord = h.position.y;
 
         h.distance =
          ((h.position.x - ray.start.x) * RCL_UNITS_PER_SQUARE) /
@@ -903,7 +902,6 @@ void RCL_castRayMultiHit(RCL_Ray ray, RCL_ArrayFunction arrayFunc,
         RCL_Unit diff = h.position.y - ray.start.y;
         h.position.x = ray.start.x + ((ray.direction.x * diff) /
           RCL_nonZero(ray.direction.y)); 
-        h.textureCoord = h.position.x;
 
         h.distance =
          ((h.position.y - ray.start.y) * RCL_UNITS_PER_SQUARE) /
@@ -914,8 +912,27 @@ void RCL_castRayMultiHit(RCL_Ray ray, RCL_ArrayFunction arrayFunc,
         h.type = typeFunc(currentSquare.x,currentSquare.y);
 
 #if RCL_COMPUTE_WALL_TEXCOORDS == 1
+      switch (h.direction)
+      {
+        case 0: h.textureCoord =
+          RCL_wrap(-1 * h.position.x,RCL_UNITS_PER_SQUARE); break;
+
+        case 1: h.textureCoord =
+          RCL_wrap(h.position.y,RCL_UNITS_PER_SQUARE); break;
+
+        case 2: h.textureCoord =
+          RCL_wrap(h.position.x,RCL_UNITS_PER_SQUARE); break;
+
+        case 3: h.textureCoord =
+          RCL_wrap(-1 * h.position.y,RCL_UNITS_PER_SQUARE); break;
+
+        default: h.textureCoord = 0; break;
+      }
+
       if (_RCL_rollFunction != 0)
         h.doorRoll = _RCL_rollFunction(currentSquare.x,currentSquare.y);
+#else
+      h.textureCoord = 0;
 #endif
 
       hitResults[*hitResultsLen] = h;