From 7d2ccf6753828684ce7916447314a624e4c3b567 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <tastyfish@seznam.cz>
Date: Tue, 18 Sep 2018 19:19:26 +0200
Subject: [PATCH] Fix renderSimple

---
 raycastlib.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/raycastlib.h b/raycastlib.h
index bfff03f..cd704d9 100644
--- a/raycastlib.h
+++ b/raycastlib.h
@@ -1220,7 +1220,10 @@ void _columnFunctionSimple(RCL_HitResult *hits, uint16_t hitCount, uint16_t x,
   p.isHorizon = 1;
   p.depth = 1;
 
-  while (y < wallStart)
+  RCL_Unit limit = wallStart < _RCL_middleRow ? wallStart : _RCL_middleRow;
+  // ^ in case there is no wall
+
+  while (y < limit)
   {
     p.position.y = y;
     RCL_PIXEL_FUNCTION(&p);
@@ -1286,7 +1289,7 @@ RCL_Unit coordStep = 1;
 #if RCL_COMPUTE_FLOOR_TEXCOORDS == 1
   RCL_Unit dx = p.hit.position.x - _RCL_camera.position.x;
   RCL_Unit dy = p.hit.position.y - _RCL_camera.position.y;
-  RCL_Unit pixPos = y - _RCL_middleRow;
+  RCL_Unit pixPos = y - _RCL_middleRow - 1;
 
   RCL_Unit rayCameraCos = RCL_vectorsAngleCos(  
     RCL_angleToDirection(_RCL_camera.direction),ray.direction);