From 670eaf346abb6af03dec8350b2829889db825103 Mon Sep 17 00:00:00 2001
From: CasualPokePlayer <50538166+CasualPokePlayer@users.noreply.github.com>
Date: Mon, 14 Oct 2024 23:51:49 -0700
Subject: [PATCH] Allocate melonDS's video buffer according to effective gl
 scaling

resolves #4090
---
 .../Consoles/Nintendo/NDS/MelonDS.cs                  | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/NDS/MelonDS.cs b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/NDS/MelonDS.cs
index 0346f06d39..8345af8670 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/NDS/MelonDS.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/NDS/MelonDS.cs
@@ -76,8 +76,8 @@ namespace BizHawk.Emulation.Cores.Consoles.Nintendo.NDS
 			{
 				DefaultWidth = 256,
 				DefaultHeight = 384,
-				MaxWidth = (256 * 16) * 3 + ((128 * 16) * 4 / 3) + 1,
-				MaxHeight = (384 / 2 * 16) * 2 + (128 * 16),
+				MaxWidth = 256 * 3 + (128 * 4 / 3) + 1,
+				MaxHeight = (384 / 2) * 2 + 128,
 				MaxSamples = 4096, // rather large max samples is intentional, see comment in ThreadStartCallback
 				DefaultFpsNumerator = 33513982,
 				DefaultFpsDenominator = 560190,
@@ -136,6 +136,13 @@ namespace BizHawk.Emulation.Cores.Consoles.Nintendo.NDS
 					else
 					{
 						_glContext = _openGLProvider.RequestGLContext(majorGlVersion, minorGlVersion, true);
+						// update buffer width/height for scaling
+						if (_activeSyncSettings.GLScaleFactor > 1)
+						{
+							BufferWidth = (256 * _activeSyncSettings.GLScaleFactor) * 3 + ((128 * _activeSyncSettings.GLScaleFactor) * 4 / 3) + 1;
+							BufferHeight = (384 / 2 * _activeSyncSettings.GLScaleFactor) * 2 + (128 * _activeSyncSettings.GLScaleFactor);
+							_videoBuffer = new int[BufferWidth * BufferHeight];
+						}
 					}
 				}