From da1d190cce92e4cda3e9e6d7ded108923d27aba4 Mon Sep 17 00:00:00 2001
From: alyosha-tas <alexei.f.k@gmail.com>
Date: Wed, 9 May 2018 22:18:10 -0400
Subject: [PATCH] GBHawk: When windowing is active, start mode 3 earlier then
 usual (for pokemon yellow sync)

---
 .../Consoles/Nintendo/GBHawk/GBC_PPU.cs               | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBC_PPU.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBC_PPU.cs
index 8447de3f2a..a3ea968b3e 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBC_PPU.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBC_PPU.cs
@@ -825,6 +825,17 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
 					{
 						read_case = 8;
 						hbl_countdown = 5;
+						if (window_started)
+						{
+							hbl_countdown -= 2;
+						}
+					}
+					if (pixel_counter == 158 && window_started)
+					{
+						STAT &= 0xFC;
+						STAT |= 0x00;
+
+						if (STAT.Bit(3)) { HBL_INT = true; }
 					}
 				}
 				else if ((render_counter >= render_offset) && (pixel_counter < 0))