First version of the SOurce SDK 2013

utils/vrad/imagepacker.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// The copyright to the contents herein is the property of Valve, L.L.C.
+// The contents may be used and/or copied only with the written permission of
+// Valve, L.L.C., or in accordance with the terms and conditions stipulated in
+// the agreement/contract under which the contents have been supplied.
+//
+// Purpose: 
+//
+// $Workfile:     $
+// $Date:         $
+// $NoKeywords: $
+//=============================================================================
+
+#include "vrad.h"
+#include "imagepacker.h"
+
+
+bool CImagePacker::Reset( int maxLightmapWidth, int maxLightmapHeight )
+{
+	int i;
+	
+	Assert( maxLightmapWidth <= MAX_MAX_LIGHTMAP_WIDTH );
+	
+	m_MaxLightmapWidth = maxLightmapWidth;
+	m_MaxLightmapHeight = maxLightmapHeight;
+	
+	m_MaxBlockWidth = maxLightmapWidth + 1;
+	m_MaxBlockHeight = maxLightmapHeight + 1;
+
+	m_AreaUsed = 0;
+	m_MinimumHeight = -1;
+	for( i = 0; i < m_MaxLightmapWidth; i++ )
+    {
+		m_pLightmapWavefront[i] = -1;
+    }
+	return true;
+}
+
+
+inline int CImagePacker::GetMaxYIndex( int firstX, int width )
+{
+	int maxY = -1;
+	int maxYIndex = 0;
+	for( int x = firstX; x < firstX + width; ++x )
+	{
+		// NOTE: Want the equals here since we'll never be able to fit
+		// in between the multiple instances of maxY
+		if( m_pLightmapWavefront[x] >= maxY )
+		{
+			maxY = m_pLightmapWavefront[x];
+			maxYIndex = x;
+		}
+	}
+	return maxYIndex;
+}
+
+
+bool CImagePacker::AddBlock( int width, int height, int *returnX, int *returnY )
+{
+	// If we've already determined that a block this big couldn't fit
+	// then blow off checking again...
+	if ( ( width >= m_MaxBlockWidth ) && ( height >= m_MaxBlockHeight ) )
+		return false;
+
+	int bestX = -1;	
+	int maxYIdx;
+	int outerX = 0;
+	int outerMinY = m_MaxLightmapHeight;
+	int lastX = m_MaxLightmapWidth - width;
+	int lastMaxYVal = -2;
+	while (outerX <= lastX)
+	{
+		// Skip all tiles that have the last Y value, these
+		// aren't going to change our min Y value
+		if (m_pLightmapWavefront[outerX] == lastMaxYVal)
+		{
+			++outerX;
+			continue;
+		}
+
+		maxYIdx = GetMaxYIndex( outerX, width );
+		lastMaxYVal = m_pLightmapWavefront[maxYIdx];
+		if (outerMinY > lastMaxYVal)
+		{
+			outerMinY = lastMaxYVal;
+			bestX = outerX;
+		}
+		outerX = maxYIdx + 1;
+	}
+	
+	if( bestX == -1 )
+	{
+		// If we failed to add it, remember the block size that failed
+		// *only if both dimensions are smaller*!!
+		// Just because a 1x10 block failed, doesn't mean a 10x1 block will fail
+		if ( ( width <= m_MaxBlockWidth ) && ( height <= m_MaxBlockHeight )	)
+		{
+			m_MaxBlockWidth = width;
+			m_MaxBlockHeight = height;
+		}
+
+		return false;
+	}
+	
+	// Set the return positions for the block.
+	*returnX = bestX;
+	*returnY = outerMinY + 1;
+	
+	// Check if it actually fit height-wise.
+	// hack
+	//  if( *returnY + height > maxLightmapHeight )
+	if( *returnY + height >= m_MaxLightmapHeight - 1 )
+	{
+		if ( ( width <= m_MaxBlockWidth ) && ( height <= m_MaxBlockHeight )	)
+		{
+			m_MaxBlockWidth = width;
+			m_MaxBlockHeight = height;
+		}
+
+		return false;
+	}
+						   
+	// It fit!
+	// Keep up with the smallest possible size for the image so far.
+	if( *returnY + height > m_MinimumHeight )
+		m_MinimumHeight = *returnY + height;
+	
+	// Update the wavefront info.
+	int x;
+	for( x = bestX; x < bestX + width; x++ )
+    {
+		m_pLightmapWavefront[x] = outerMinY + height;
+    }
+	
+	//  AddBlockToLightmapImage( *returnX, *returnY, width, height );
+	m_AreaUsed += width * height;
+
+	return true;
+}
+