Import all sources from perforce.

src/nvimage/nvtt/squish/clusterfit.h

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+/* -----------------------------------------------------------------------------
+
+	Copyright (c) 2006 Simon Brown                          si@sjbrown.co.uk
+
+	Permission is hereby granted, free of charge, to any person obtaining
+	a copy of this software and associated documentation files (the 
+	"Software"), to	deal in the Software without restriction, including
+	without limitation the rights to use, copy, modify, merge, publish,
+	distribute, sublicense, and/or sell copies of the Software, and to 
+	permit persons to whom the Software is furnished to do so, subject to 
+	the following conditions:
+
+	The above copyright notice and this permission notice shall be included
+	in all copies or substantial portions of the Software.
+
+	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+	OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
+	MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+	IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 
+	CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
+	TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
+	SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+	
+   -------------------------------------------------------------------------- */
+   
+#ifndef SQUISH_CLUSTERFIT_H
+#define SQUISH_CLUSTERFIT_H
+
+#include "squish.h"
+#include "maths.h"
+#include "simd.h"
+#include "colourfit.h"
+
+namespace squish {
+
+class ClusterFit : public ColourFit
+{
+public:
+	ClusterFit( ColourSet const* colours, int flags );
+	
+	void setMetric(float r, float g, float b);
+	float bestError() const;
+
+private:
+	virtual void Compress3( void* block );
+	virtual void Compress4( void* block );
+
+	void Reorder( Vec3::Arg principle );
+
+	Vec3 m_principle;
+#if SQUISH_USE_SIMD
+	Vec4 SolveLeastSquares( Vec4& start, Vec4& end ) const;
+
+	Vec4 m_weighted[16];
+	Vec4 m_unweighted[16];
+	Vec4 m_weights[16];
+	Vec4 m_metric;
+	Vec4 m_alpha[16];
+	Vec4 m_beta[16];
+	Vec4 m_xxsum;
+	Vec4 m_besterror;
+#else
+	float SolveLeastSquares( Vec3& start, Vec3& end ) const;
+
+	Vec3 m_weighted[16];
+	Vec3 m_unweighted[16];
+	float m_weights[16];
+	Vec3 m_metric;
+	float m_alpha[16];
+	float m_beta[16];
+	Vec3 m_xxsum;
+	float m_besterror;
+#endif
+	int m_order[16];
+};
+
+} // namespace squish
+
+#endif // ndef SQUISH_CLUSTERFIT_H