From 5e1c6aba331d2a3cb0f0ce32cce78b4b9b12fa01 Mon Sep 17 00:00:00 2001
From: magumagu <magumagu9@gmail.com>
Date: Tue, 15 Apr 2014 14:01:22 -0700
Subject: [PATCH] Software backend: make TEV rounding match hardware.

Formulas stolen from gxtest.  (Not sure how "==" got turned into "!=", but
I'm pretty confident the patched version is correct.)
---
 Source/Core/VideoBackends/Software/Tev.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Source/Core/VideoBackends/Software/Tev.cpp b/Source/Core/VideoBackends/Software/Tev.cpp
index 89e8efc5c6..699c51d433 100644
--- a/Source/Core/VideoBackends/Software/Tev.cpp
+++ b/Source/Core/VideoBackends/Software/Tev.cpp
@@ -185,8 +185,9 @@ void Tev::DrawColorRegular(TevStageCombiner::ColorCombiner &cc, const InputRegTy
 
 		s32 temp = InputReg.a * (256 - c) + (InputReg.b * c);
 		temp <<= m_ScaleLShiftLUT[cc.shift];
-		temp += (cc.shift != 3) ? 0 : (cc.op == 1) ? 127 : 128;
-		temp = cc.op ? (-temp >> 8) : (temp >> 8);
+		temp += (cc.shift == 3) ? 0 : (cc.op == 1) ? 127 : 128;
+		temp >>= 8;
+		temp = cc.op ? -temp : temp;
 
 		s32 result = ((InputReg.d + m_BiasLUT[cc.bias]) << m_ScaleLShiftLUT[cc.shift]) + temp;
 		result = result >> m_ScaleRShiftLUT[cc.shift];