From 7810e9950756730a9a2a677eb01fd0d94338f08b Mon Sep 17 00:00:00 2001
From: Misa <infoteddyatgitgud@cock.li>
Date: Wed, 29 Apr 2020 11:09:07 -0700
Subject: [PATCH] Interpolate vertical warp background

So it'll look very smooth. Again, only really noticeable in slowdown
(although I could kind of tell the difference at full speed).
---
 desktop_version/src/Graphics.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/desktop_version/src/Graphics.cpp b/desktop_version/src/Graphics.cpp
index 611707c2..89dedd45 100644
--- a/desktop_version/src/Graphics.cpp
+++ b/desktop_version/src/Graphics.cpp
@@ -1963,7 +1963,9 @@ void Graphics::drawbackground( int t )
         BlitSurfaceStandard(towerbuffer_lerp, NULL, backBuffer, NULL);
         break;
     case 4: //Warp zone (vertical)
-        SDL_BlitSurface(towerbuffer,NULL, backBuffer,NULL);
+        SDL_BlitSurface(towerbuffer, NULL, towerbuffer_lerp, NULL);
+        ScrollSurface(towerbuffer_lerp, 0, lerp(0, -3));
+        SDL_BlitSurface(towerbuffer_lerp,NULL, backBuffer,NULL);
         break;
     case 5:
         //Warp zone, central