From: Toni Wilen <twilen@winuae.net>
Date: Thu, 20 Jun 2024 18:46:35 +0000 (+0300)
Subject: Fix Picmatic (100Hz TV only) light gun positioning in lores or shres resolutions.
X-Git-Tag: 5310~29
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=6ce3b6671ddbe900fa5cf5b9fe99d01fae8b8a6e;p=francis%2Fwinuae.git

Fix Picmatic (100Hz TV only) light gun positioning in lores or shres resolutions.
---

diff --git a/arcadia.cpp b/arcadia.cpp
index 99cf3574..299d4729 100644
--- a/arcadia.cpp
+++ b/arcadia.cpp
@@ -656,8 +656,10 @@ static uae_u32 REGPARAM2 alg_bget (uaecptr addr)
 			// Picmatic 100Hz games
 			int reg = (addr >> 12) & 15;
 			uae_u8 v = 0;
-			uae_u16 x = lightpen_x[1 - picmatic_ply];
-			uae_u16 y = lightpen_y[1 - picmatic_ply] >> currprefs.gfx_vresolution;
+			uae_s16 x = lightpen_x[1 - picmatic_ply];
+			x <<= 1;
+			x >>= currprefs.gfx_resolution;
+			uae_s16 y = lightpen_y[1 - picmatic_ply] >> currprefs.gfx_vresolution;
 			if (reg == 3) {
 				v = 0xff;
 				// left trigger