From 8440bc7f037bc232234ef5c18e319b27ac1e507b Mon Sep 17 00:00:00 2001
From: Ian Curtis <i.curtis@gmail.com>
Date: Fri, 3 Jun 2016 09:33:46 +0000
Subject: [PATCH] support negative exponent

---
 Src/Graphics/New3D/New3D.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Src/Graphics/New3D/New3D.cpp b/Src/Graphics/New3D/New3D.cpp
index 3d418d2..e29d02e 100644
--- a/Src/Graphics/New3D/New3D.cpp
+++ b/Src/Graphics/New3D/New3D.cpp
@@ -1177,8 +1177,16 @@ void CNew3D::CalcTexOffset(int offX, int offY, int page, int x, int y, int& newX
 
 UINT32 CNew3D::ConvertProFloat(UINT32 a1)
 {
-	int exponent = ((a1 & 0x7E000000) >> 25) + 127;
+	int exponent = (a1 & 0x7E000000) >> 25;
 
+	if (exponent <= 31) {	// positive
+		exponent += 127;
+	}
+	else {					// negative exponent
+		exponent -= 64;
+		exponent += 127;
+	}
+	
 	int mantissa = (a1 & 0x1FFFFFF) >> 2;
 
 	return (a1 & 0x80000000) | (exponent << 23) | mantissa;