michael@0: //
michael@0: // Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: //
michael@0: 
michael@0: #ifndef _VARIABLEPACKER_INCLUDED_
michael@0: #define _VARIABLEPACKER_INCLUDED_
michael@0: 
michael@0: #include <vector>
michael@0: #include "compiler/ShHandle.h"
michael@0: 
michael@0: class VariablePacker {
michael@0:  public:
michael@0:     // Returns true if the passed in variables pack in maxVectors following
michael@0:     // the packing rules from the GLSL 1.017 spec, Appendix A, section 7.
michael@0:     bool CheckVariablesWithinPackingLimits(
michael@0:         int maxVectors,
michael@0:         const TVariableInfoList& in_variables);
michael@0: 
michael@0:     // Gets how many components in a row a data type takes.
michael@0:     static int GetNumComponentsPerRow(ShDataType type);
michael@0: 
michael@0:     // Gets how many rows a data type takes.
michael@0:     static int GetNumRows(ShDataType type);
michael@0: 
michael@0:  private:
michael@0:     static const int kNumColumns = 4;
michael@0:     static const unsigned kColumnMask = (1 << kNumColumns) - 1;
michael@0: 
michael@0:     unsigned makeColumnFlags(int column, int numComponentsPerRow);
michael@0:     void fillColumns(int topRow, int numRows, int column, int numComponentsPerRow);
michael@0:     bool searchColumn(int column, int numRows, int* destRow, int* destSize);
michael@0: 
michael@0:     int topNonFullRow_;
michael@0:     int bottomNonFullRow_;
michael@0:     int maxRows_;
michael@0:     std::vector<unsigned> rows_;
michael@0: };
michael@0: 
michael@0: #endif // _VARIABLEPACKER_INCLUDED_