From: Toni Wilen <twilen@winuae.net>
Date: Sun, 7 Jan 2024 14:15:02 +0000 (+0200)
Subject: Fix hardware emulated RTG boards split (screen dragging) horizontal offset.
X-Git-Tag: 5200~81
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=4cecb4703e2f25d19a3d33c1952064c85ddfaae7;p=francis%2Fwinuae.git

Fix hardware emulated RTG boards split (screen dragging) horizontal offset.
---

diff --git a/pcem/vid_svga.cpp b/pcem/vid_svga.cpp
index 7580986d..370482b0 100644
--- a/pcem/vid_svga.cpp
+++ b/pcem/vid_svga.cpp
@@ -695,7 +695,7 @@ int svga_poll(void *p)
                                 svga->ma = svga->maback = 0;
                                 svga->sc = 0;
                                 if (svga->attrregs[0x10] & 0x20) {
-                                        svga->scrollcache_dst = 0;
+                                        svga->scrollcache_dst = svga->scrollcache_dst_reset;
                                         svga->scrollcache_src = 0;
                                 }
                         }
@@ -841,6 +841,7 @@ int svga_poll(void *p)
                             svga->scrollcache_dst = (8 - (scrollcache & 6)) + 24;
                         }
                         svga->scrollcache_src = 0;
+                        svga->scrollcache_dst_reset = svga->scrollcache_dst;
 
                         if (svga->adjust_panning) {
                             svga->adjust_panning(svga);
diff --git a/pcem/vid_svga.h b/pcem/vid_svga.h
index 0bcd429a..2f17d137 100644
--- a/pcem/vid_svga.h
+++ b/pcem/vid_svga.h
@@ -76,7 +76,7 @@ typedef struct svga_t
         int sc;
         int linepos, vslines, linecountff, oddeven;
         int con, cursoron, blink;
-        int scrollcache_src, scrollcache_dst;
+        int scrollcache_src, scrollcache_dst, scrollcache_dst_reset;
         int char_width;
         
         int firstline, lastline;