ShTransformer.hpp

// Sh: A GPU metaprogramming language.
//
// Copyright (c) 2003 University of Waterloo Computer Graphics Laboratory
// Project administrator: Michael D. McCool
// Authors: Zheng Qin, Stefanus Du Toit, Kevin Moule, Tiberiu S. Popa,
//          Michael D. McCool
// 
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
// 
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 
// 1. The origin of this software must not be misrepresented; you must
// not claim that you wrote the original software. If you use this
// software in a product, an acknowledgment in the product documentation
// would be appreciated but is not required.
// 
// 2. Altered source versions must be plainly marked as such, and must
// not be misrepresented as being the original software.
// 
// 3. This notice may not be removed or altered from any source
// distribution.
#ifndef SHTRANSFORMER_HPP
#define SHTRANSFORMER_HPP

#include "ShDllExport.hpp"
#include "ShBackend.hpp"
#include "ShProgram.hpp"
#include "ShCtrlGraph.hpp"
#include "ShInternals.hpp"
#include "ShVariableType.hpp"

namespace SH {

class 
SH_DLLEXPORT ShTransformer {
public:
  ShTransformer(const ShProgramNodePtr& program);
  ShTransformer::~ShTransformer();
  bool changed(); //< returns true iff one of the transformations changed the shader

  typedef std::vector<ShVariableNodePtr> VarNodeVec;
  typedef std::map<ShVariableNodePtr, VarNodeVec> VarSplitMap;
  friend struct VariableSplitter;
  friend struct StatementSplitter;
  void splitTuples(int maxTuple, VarSplitMap &splits);
  
  friend struct InputOutputConvertor;
  void convertInputOutput();
  
  void convertTextureLookups();

  
  void convertIntervalTypes(VarSplitMap &splits);


  typedef std::map<ShValueType, ShValueType> ValueTypeMap;  
  void convertToFloat(ValueTypeMap &typeMap);

  //@todo  use dependent uniforms in conversion and spliting functions
  //instead of separate VarSplitMaps and ShVarMaps
  
private:
  ShTransformer(const ShTransformer& other);
  ShTransformer& operator=(const ShTransformer& other);

  ShProgramNodePtr m_program;
  bool m_changed;
};

}

#endif

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