From c9ee85b8b2b246c2bc97df0012819a703b64fc02 Mon Sep 17 00:00:00 2001
From: angelosa <salese_corp_ltd@email.it>
Date: Tue, 1 May 2018 23:46:52 +0200
Subject: [PATCH] stvvdp2.cpp: don't repeat ROZ when screen over process is
 equal to 1, fixes D-Xhird practice stage [Angelo Salese]

---
 src/devices/video/stvvdp2.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/devices/video/stvvdp2.cpp b/src/devices/video/stvvdp2.cpp
index 034b9de248e..737a92e8f05 100644
--- a/src/devices/video/stvvdp2.cpp
+++ b/src/devices/video/stvvdp2.cpp
@@ -4667,8 +4667,11 @@ void saturn_state::stv_vdp2_copy_roz_bitmap(bitmap_rgb32 &bitmap,
 			clipxmask = clipymask = 0;
 			break;
 		case 1:
-			/* screen over pattern, not supported */
-			clipxmask = clipymask = 0;
+			/* screen over pattern */
+			// TODO: not supported, cfr. STV_VDP2_OVPNRA / STV_VDP2_OVPNRB
+			// D-Xhird uses this on practice stage
+			clipxmask = ~planesizex;
+			clipymask = ~planesizey;
 			break;
 		case 2:
 			/* outside display area, scroll screen is transparent */