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 //

 // Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved.

 // Use of this source code is governed by a BSD-style license that can be

 // found in the LICENSE file.

 //

 #ifndef _VARIABLEPACKER_INCLUDED_

 #define _VARIABLEPACKER_INCLUDED_

 #include <vector>

 #include "compiler/ShHandle.h"

 class VariablePacker {

  public:

     // Returns true if the passed in variables pack in maxVectors following

     // the packing rules from the GLSL 1.017 spec, Appendix A, section 7.

     bool CheckVariablesWithinPackingLimits(

         int maxVectors,

         const TVariableInfoList& in_variables);

     // Gets how many components in a row a data type takes.

     static int GetNumComponentsPerRow(ShDataType type);

     // Gets how many rows a data type takes.

     static int GetNumRows(ShDataType type);

  private:

     static const int kNumColumns = 4;

     static const unsigned kColumnMask = (1 << kNumColumns) - 1;

     unsigned makeColumnFlags(int column, int numComponentsPerRow);

     void fillColumns(int topRow, int numRows, int column, int numComponentsPerRow);

     bool searchColumn(int column, int numRows, int* destRow, int* destSize);

     int topNonFullRow_;

     int bottomNonFullRow_;

     int maxRows_;

     std::vector<unsigned> rows_;

 };

 #endif // _VARIABLEPACKER_INCLUDED_