From df8b84a0d5883fef771063a799272193ca1968d2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <tastyfish@seznam.cz>
Date: Fri, 7 Sep 2018 18:35:55 +0200
Subject: [PATCH] Fix drawing bug

---
 raycastlib.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/raycastlib.h b/raycastlib.h
index 045df40..e964f3c 100644
--- a/raycastlib.h
+++ b/raycastlib.h
@@ -676,6 +676,7 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
     int_maybe32_t z1ScreenNoClamp = z1Screen;
 
     z1Screen = clamp(z1Screen,0,_camResYLimit);
+    z1Screen = z1Screen > y2 ? z1Screen : y2;
 
     int_maybe32_t z1ScreenCeil = _middleRow - perspectiveScale(
       (worldZPrevCeil * _camera.resolution.y) / UNITS_PER_SQUARE,dist);
@@ -683,6 +684,7 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
     int_maybe32_t z1ScreenCeilNoClamp = z1ScreenCeil;
 
     z1ScreenCeil = clamp(z1ScreenCeil,0,_camResYLimit);
+    z1ScreenCeil = z1ScreenCeil < y ? z1ScreenCeil : y;
 
     int_maybe32_t z2Screen = _middleRow - perspectiveScale(
       (worldZ2 * _camera.resolution.y) / UNITS_PER_SQUARE,dist);
@@ -693,6 +695,7 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
       wallScreenHeightNoClamp : 1;
 
     z2Screen = clamp(z2Screen,0,_camResYLimit);
+    z2Screen = z2Screen > y2 ? z2Screen : y2;
 
     int_maybe32_t z2ScreenCeil = _middleRow - perspectiveScale(
       (worldZ2Ceil * _camera.resolution.y) / UNITS_PER_SQUARE,dist);
@@ -704,6 +707,7 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
       wallScreenHeightCeilNoClamp : 1;
 
     z2ScreenCeil = clamp(z2ScreenCeil,0,_camResYLimit);
+    z2ScreenCeil = z2ScreenCeil < y ? z2ScreenCeil : y;
 
     int_maybe32_t zTop = z1Screen < z2Screen ? z1Screen : z2Screen;