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materialsystem/imagepacker.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Workfile:     $
+// $Date:         $
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef IMAGEPACKER_H
+#define IMAGEPACKER_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "utlvector.h"
+#include "utlrbtree.h"
+
+#define MAX_MAX_LIGHTMAP_WIDTH 2048
+
+
+//-----------------------------------------------------------------------------
+// This packs a single lightmap
+//-----------------------------------------------------------------------------
+class CImagePacker
+{
+public:
+	bool Reset( int nSortId, int maxLightmapWidth, int maxLightmapHeight );
+	bool AddBlock( int width, int height, 
+		int *returnX, int *returnY );
+	void GetMinimumDimensions( int *returnWidth, int *returnHeight );
+	float GetEfficiency( void );
+	int GetSortId() const;
+	void IncrementSortId();
+
+protected:
+	int GetMaxYIndex( int firstX, int width );
+
+	int m_MaxLightmapWidth;
+	int m_MaxLightmapHeight;
+	int m_pLightmapWavefront[MAX_MAX_LIGHTMAP_WIDTH];
+	int m_AreaUsed;
+	int m_MinimumHeight;
+
+	// For optimization purposes:
+	// These store the width + height of the first image
+	// that was unable to be stored in this image
+	int m_MaxBlockWidth;
+	int m_MaxBlockHeight;
+	int m_nSortID;
+};
+
+
+//-----------------------------------------------------------------------------
+// Inline methods
+//-----------------------------------------------------------------------------
+inline int CImagePacker::GetSortId() const
+{
+	return m_nSortID;
+}
+
+inline void CImagePacker::IncrementSortId()
+{
+	++m_nSortID;
+}
+
+
+#endif // IMAGEPACKER_H