From e0d5b0be7bad01c1bd24feb650f1ab8311544a72 Mon Sep 17 00:00:00 2001
From: s2s <12202580+standard-two-simplex@users.noreply.github.com>
Date: Sun, 23 May 2021 21:28:16 +0200
Subject: [PATCH] Shift S2DEX background texture coordinates in non-native
 resolutions.

---
 src/uCodes/S2DEX.cpp | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/uCodes/S2DEX.cpp b/src/uCodes/S2DEX.cpp
index 75d0a02c..37356c9f 100644
--- a/src/uCodes/S2DEX.cpp
+++ b/src/uCodes/S2DEX.cpp
@@ -502,9 +502,16 @@ struct ObjCoordinates
 		lrs = uls + (lrx - ulx) * scaleW;
 		lrt = ult + (lry - uly) * scaleH;
 
+		if (config.frameBufferEmulation.nativeResFactor != 1 || config.video.multisampling != 0) {
+			uls -= 0.5f * scaleW;
+			ult -= 0.5f * scaleH;
+			lrs -= 0.5f * scaleW;
+			lrt -= 0.5f * scaleH;
+		}
+
 		// G_CYC_COPY (BgRectCopyOnePiece()) does not allow texture filtering
 		if (gDP.otherMode.cycleType != G_CYC_COPY) {
-			// Correct texture coordinates if G_OBJRM_BILERP 
+			// Correct texture coordinates if G_OBJRM_BILERP
 			// bilinear interpolation is set
 			if ((gSP.objRendermode & G_OBJRM_BILERP) != 0) {
 				// No correction gives the best picture, but is this correct?
@@ -521,7 +528,7 @@ struct ObjCoordinates
 				lrs -= 0.5f;
 				lrt -= 0.5f;
 			}
-			// SHRINKSIZE_2 adds a 1.0f perimeter 
+			// SHRINKSIZE_2 adds a 1.0f perimeter
 			// upper left texture coords += 1.0f; lower left texture coords -= 1.0f
 			else if ((gSP.objRendermode&G_OBJRM_SHRINKSIZE_2) != 0) {
 				uls += 1.0f;