Add cluster fit implementation based on squish.

src/nvtt/ClusterFit.h

@@ -0,0 +1,82 @@
+/* -----------------------------------------------------------------------------
+
+	Copyright (c) 2006 Simon Brown                          si@sjbrown.co.uk
+	Copyright (c) 2006 Ignacio Castano                      icastano@nvidia.com
+
+	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 NVTT_CLUSTERFIT_H
+#define NVTT_CLUSTERFIT_H
+
+#define NVTT_USE_SIMD 0
+
+#include "nvmath/SimdVector.h"
+#include "nvmath/Vector.h"
+
+namespace nv {
+
+    struct ColorSet;
+
+    class ClusterFit
+    {
+    public:
+	    ClusterFit();
+
+	    void setColourSet(const ColorSet * set);
+    	
+        void setMetric(Vector4::Arg w);
+	    float bestError() const;
+
+	    bool compress3(Vector3 * start, Vector3 * end);
+	    bool compress4(Vector3 * start, Vector3 * end);
+    	
+    private:
+
+        uint count;
+	    //ColorSet const* m_colours;
+
+        Vector3 m_principle;
+
+    #if NVTT_USE_SIMD
+        SimdVector m_weighted[16];
+	    SimdVector m_metric;
+	    SimdVector m_metricSqr;
+	    SimdVector m_xxsum;
+	    SimdVector m_xsum;
+	    SimdVector m_besterror;
+    #else
+	    Vector3 m_weighted[16];
+	    float m_weights[16];
+	    Vector3 m_metric;
+	    Vector3 m_metricSqr;
+	    Vector3 m_xxsum;
+	    Vector3 m_xsum;
+	    float m_wsum;
+	    float m_besterror;
+    #endif
+
+	    int m_order[16];
+    };
+
+} // nv namespace
+
+#endif // NVTT_CLUSTERFIT_H