kc3-lang/angle/src/compiler/VariablePacker.h

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• Author : gman@chromium.org
  Date : 2012-10-17 21:33:48
  Hash : 8d804799
  Message : Add Variable Packing checks to ANGLE BUG=373 TEST=unit tests git-svn-id: https://angleproject.googlecode.com/svn/trunk@1317 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/compiler/VariablePacker.h

• //
  // 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_