Line data    Source code

       1             : //
       2             : // Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved.
       3             : // Use of this source code is governed by a BSD-style license that can be
       4             : // found in the LICENSE file.
       5             : //
       6             : 
       7             : #ifndef COMPILER_TRANSLATOR_VARIABLEPACKER_H_
       8             : #define COMPILER_TRANSLATOR_VARIABLEPACKER_H_
       9             : 
      10             : #include <vector>
      11             : #include "compiler/translator/VariableInfo.h"
      12             : 
      13           0 : class VariablePacker {
      14             :  public:
      15             :    // Returns true if the passed in variables pack in maxVectors following
      16             :    // the packing rules from the GLSL 1.017 spec, Appendix A, section 7.
      17             :    bool CheckVariablesWithinPackingLimits(unsigned int maxVectors,
      18             :                                           const std::vector<sh::ShaderVariable> &in_variables);
      19             : 
      20             :    // Gets how many components in a row a data type takes.
      21             :    static int GetNumComponentsPerRow(sh::GLenum type);
      22             : 
      23             :    // Gets how many rows a data type takes.
      24             :    static int GetNumRows(sh::GLenum type);
      25             : 
      26             :  private:
      27             :    static const int kNumColumns      = 4;
      28             :    static const unsigned kColumnMask = (1 << kNumColumns) - 1;
      29             : 
      30             :    unsigned makeColumnFlags(int column, int numComponentsPerRow);
      31             :    void fillColumns(int topRow, int numRows, int column, int numComponentsPerRow);
      32             :    bool searchColumn(int column, int numRows, int *destRow, int *destSize);
      33             : 
      34             :    int topNonFullRow_;
      35             :    int bottomNonFullRow_;
      36             :    int maxRows_;
      37             :    std::vector<unsigned> rows_;
      38             : };
      39             : 
      40             : #endif // COMPILER_TRANSLATOR_VARIABLEPACKER_H_