From: Toni Wilen <twilen@winuae.net>
Date: Sat, 27 Nov 2021 14:52:09 +0000 (+0200)
Subject: Blitter C-channel modulo addition was incorrectly enabled in line mode with C channel... 
X-Git-Tag: 4900~12
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=9243a6b771cab5dbfaaf8d0038232f0dfb3bcc9e;p=francis%2Fwinuae.git

Blitter C-channel modulo addition was incorrectly enabled in line mode with C channel disabled.
---

diff --git a/blitter.cpp b/blitter.cpp
index 6da06359..68eb86bc 100644
--- a/blitter.cpp
+++ b/blitter.cpp
@@ -721,13 +721,17 @@ static void blitter_line_decx(void)
 
 static void blitter_line_decy(void)
 {
-	bltcpt -= blt_info.bltcmod;
+	if (bltcon0 & 0x0200) {
+		bltcpt -= blt_info.bltcmod;
+	}
 	blitonedot = 0;
 }
 
 static void blitter_line_incy(void)
 {
-	bltcpt += blt_info.bltcmod;
+	if (bltcon0 & 0x0200) {
+		bltcpt += blt_info.bltcmod;
+	}
 	blitonedot = 0;
 }