From 0c5ccf7156020df3324b88af716a91e81f67ffda Mon Sep 17 00:00:00 2001
From: skidau <skidau@gmail.com>
Date: Mon, 15 Nov 2010 11:32:30 +0000
Subject: [PATCH] Tweaked the VBeam logic enough to fix Endless Ocean 2.  This
 might also fix a few other games that have been black screening on boot
 recently.

Fixes issue 3472.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6423 8ced0084-cf51-0410-be5f-012b33b47a6e
---
 Source/Core/Core/Src/HW/VideoInterface.cpp | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/Source/Core/Core/Src/HW/VideoInterface.cpp b/Source/Core/Core/Src/HW/VideoInterface.cpp
index 2ea6b04795..d3598a7d4b 100644
--- a/Source/Core/Core/Src/HW/VideoInterface.cpp
+++ b/Source/Core/Core/Src/HW/VideoInterface.cpp
@@ -798,7 +798,8 @@ void Update()
 	{
 		// Progressive
 		NewVBeamPos = s_lineCount + 1;
-		BeginField(FIELD_PROGRESSIVE);
+		if (m_VBeamPos == 1)
+			BeginField(FIELD_PROGRESSIVE);
 	}
 	else if (m_VBeamPos == s_upperFieldBegin)
 	{
@@ -830,17 +831,15 @@ void Update()
 		EndField();
 	}
 
+	if (++m_VBeamPos > s_lineCount)
+		m_VBeamPos = (NewVBeamPos > s_lineCount) ? 1 : NewVBeamPos;
+
 	for (int i = 0; i < 4; i++)
 	{
-		if (m_VBeamPos <= m_InterruptRegister[i].VCT && m_InterruptRegister[i].VCT < NewVBeamPos)
+		if (m_VBeamPos == m_InterruptRegister[i].VCT)
 			m_InterruptRegister[i].IR_INT = 1;
 	}
 	UpdateInterrupts();
-
-	if (++m_VBeamPos > s_lineCount)
-	{
-		m_VBeamPos = (NewVBeamPos > s_lineCount) ? 1 : NewVBeamPos;
-	}
 }
 
 } // namespace