From 4d5593ebcbc4c6716068777aab3e9e02b530125b Mon Sep 17 00:00:00 2001
From: Asdow <20314541+Asdow@users.noreply.github.com>
Date: Mon, 22 Jun 2026 00:12:41 +0300
Subject: [PATCH] Fix render misalignment at 960x540 resolution

Should also work for any custom resolution that suffers from the same issue
---
 TileEngine/renderworld.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/TileEngine/renderworld.cpp b/TileEngine/renderworld.cpp
index e460ac46..da4c37bd 100644
--- a/TileEngine/renderworld.cpp
+++ b/TileEngine/renderworld.cpp
@@ -8588,6 +8588,21 @@ void CalcRenderParameters(INT16 sLeft, INT16 sTop, INT16 sRight, INT16 sBottom )
 	gsLStartPointX_M = floor( DOUBLE(gsLStartPointX_W) / DOUBLE(CELL_X_SIZE) );
 	gsLStartPointY_M = floor( DOUBLE(gsLStartPointY_W) / DOUBLE(CELL_Y_SIZE) );
 
+	// Check and correct the difference between smaller and larger start blocks in tile coordinates.
+	// Regardless of resolution, the difference between the start blocks are constant 10 tiles in X- and 6 tiles in Y-direction.
+	// If the difference doesn't match, static world is rendered in the wrong place relative to dynamic world.
+	// Mainly evident in 960x540 resolution.
+	const auto ratioX_M = gsStartPointX_M - gsLStartPointX_M;
+	if ( ratioX_M != 10)
+	{
+		gsLStartPointX_M -= 10 - ratioX_M;
+	}
+	const auto ratioY_M = gsStartPointY_M - gsLStartPointY_M;
+	if ( ratioY_M != 6 )
+	{
+		gsLStartPointY_M -= 6 - ratioY_M;
+	}
+
 	// Adjust starting screen coordinates
 	gsLStartPointX_S	-= sOffsetX_S;