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diff --git a/source/mupen64plus-video-arachnoid/src/VI.cpp b/source/mupen64plus-video-arachnoid/src/VI.cpp
new file mode 100755
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+++ b/source/mupen64plus-video-arachnoid/src/VI.cpp
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+/******************************************************************************
+ * Arachnoid Graphics Plugin for Mupen64Plus
+ * http://bitbucket.org/wahrhaft/mupen64plus-video-arachnoid/
+ *
+ * Copyright (C) 2007 Kristofer Karlsson, Rickard Niklasson
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *****************************************************************************/
+
+#include "VI.h"
+#include "GBIDefs.h" //_FIXED2FLOAT, _SHIFTR
+#include "m64p.h"
+
+//-----------------------------------------------------------------------------
+//! Constructor
+//-----------------------------------------------------------------------------
+VI::VI()
+{
+    m_width = 320;
+    m_height = 240;
+}
+
+//-----------------------------------------------------------------------------
+//! Destructor
+//-----------------------------------------------------------------------------
+VI::~VI()
+{
+
+}
+
+//-----------------------------------------------------------------------------
+//* Calculate Size
+//! Calculates width and height of video interface
+//-----------------------------------------------------------------------------
+void VI::calcSize(GFX_INFO*  graphicsInfo)
+{
+    //Get video interface values
+    //unsigned int viScaleX          = *graphicsInfo->VI_X_SCALE_REG;
+    //unsigned int viScaleY          = *graphicsInfo->VI_X_SCALE_REG;
+    unsigned int viStartHorizontal = *graphicsInfo->VI_H_START_REG;
+    unsigned int viStartVertical   = *graphicsInfo->VI_V_START_REG;
+
+    //Get Scale
+    float xScale = _FIXED2FLOAT(_SHIFTR(*graphicsInfo->VI_X_SCALE_REG, 0, 12), 10);
+    float yScale = _FIXED2FLOAT(_SHIFTR(*graphicsInfo->VI_Y_SCALE_REG, 0, 12), 10);
+
+    //Get Offsets (no need for these?)
+    //float xOffset = _FIXED2FLOAT(_SHIFTR(viScaleX, 16, 12), 10);
+    //float yOffset = _FIXED2FLOAT(_SHIFTR(viScaleY, 16, 12), 10);
+
+    //Get horizontal coordinats
+    unsigned int hEnd = _SHIFTR( viStartHorizontal, 0, 10 );
+    unsigned int hStart = _SHIFTR( viStartHorizontal, 16, 10 );
+
+    //Get vertical coordinats
+    // These are in half-lines, so shift an extra bit
+    unsigned int vEnd = _SHIFTR( viStartVertical, 1, 9 );
+    unsigned int vStart = _SHIFTR( viStartVertical, 17, 9 );
+
+    //Calculate size
+    m_width = (int)((hEnd - hStart) * xScale);
+    m_height = (int)((vEnd - vStart) * yScale * 1.0126582f);
+
+    //If Zero: Set to defaults
+    if ( m_width == 0.0f ) m_width = 320;
+    if ( m_height == 0.0f ) m_height = 240;
+
+    //m_width = 320;
+    //m_height = 240;
+}