ShStorageType.hpp

// Sh: A GPU metaprogramming language.
//
// Copyright 2003-2005 Serious Hack Inc.
// 
// 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 SHSTORAGETYPE_HPP
#define SHSTORAGETYPE_HPP

#include "ShUtility.hpp"
#include "ShVariableType.hpp"
#include "ShHalf.hpp"
#include "ShFraction.hpp"

namespace SH {

struct ShInvalidStorageType {};

typedef unsigned int ShValueType;
enum __ShValueTypeEnum {
  SH_HALF       = 0x0001, 
  SH_FLOAT      = 0x0002, 
  SH_DOUBLE     = 0x0003, 

  SH_BYTE       = 0x0010,
  SH_SHORT      = 0x0011,
  SH_INT        = 0x0012,

  SH_UBYTE      = 0x0018,
  SH_USHORT     = 0x0019,
  SH_UINT       = 0x001A,

  SH_FBYTE      = 0x0020,
  SH_FSHORT     = 0x0021,
  SH_FINT       = 0x0022,

  SH_FUBYTE     = 0x0028,
  SH_FUSHORT    = 0x0029,
  SH_FUINT      = 0x002A,

  SH_I_HALF    = 0x0101,
  SH_I_FLOAT   = 0x0102,
  SH_I_DOUBLE  = 0x0103,

  SH_A_HALF    = 0x0201,
  SH_A_FLOAT   = 0x0202,
  SH_A_DOUBLE  = 0x0203,

  SH_VALUETYPE_SIZE_MASK = 0x0007,

  SH_VALUETYPE_SIGNED_MASK = 0x0008,
  SH_VALUETYPE_SIGNED = 0x0000,

  SH_VALUETYPE_TYPE_MASK = 0x00F0,
  SH_VALUETYPE_TYPE_FLOAT = 0x0000,
  SH_VALUETYPE_TYPE_INT   = 0x0010,
  SH_VALUETYPE_TYPE_FRAC  = 0x0020,

  SH_VALUETYPE_SPECIAL_MASK = 0x7F00, 
  SH_VALUETYPE_SPECIAL_NONE = 0x0000, 
  SH_VALUETYPE_SPECIAL_I    = 0x0100, 
  SH_VALUETYPE_SPECIAL_A    = 0x0200, 

  SH_VALUETYPE_END = 0xFFFF
};
// @}

bool shIsFloat(ShValueType value_type);
bool shIsInteger(ShValueType value_type);
bool shIsFraction(ShValueType value_type);

bool shIsSigned(ShValueType value_type);

bool shIsRegularValueType(ShValueType value_type);

bool shIsInvalidValueType(ShValueType value_type);
// @}

template<ShValueType V> struct __ShValueToStorageType { typedef ShInvalidStorageType type; };
template<typename T> struct __ShStorageToValueType { static const ShValueType type = SH_VALUETYPE_END; };

#define SH_VALUE_STORAGE_TYPE_MAPPING(V, T)\
  template<> struct __ShValueToStorageType<V >    { typedef T type; }; \
  template<> struct __ShStorageToValueType<T >    { static const ShValueType type = V; }; 

SH_VALUE_STORAGE_TYPE_MAPPING(SH_HALF,    ShHalf); 
SH_VALUE_STORAGE_TYPE_MAPPING(SH_FLOAT,   float); 
SH_VALUE_STORAGE_TYPE_MAPPING(SH_DOUBLE,  double); 

SH_VALUE_STORAGE_TYPE_MAPPING(SH_BYTE,    char); 
SH_VALUE_STORAGE_TYPE_MAPPING(SH_SHORT,   short); 
SH_VALUE_STORAGE_TYPE_MAPPING(SH_INT,     int); 
SH_VALUE_STORAGE_TYPE_MAPPING(SH_UBYTE,   unsigned char); 
SH_VALUE_STORAGE_TYPE_MAPPING(SH_USHORT,  unsigned short); 
SH_VALUE_STORAGE_TYPE_MAPPING(SH_UINT,    unsigned int); 

SH_VALUE_STORAGE_TYPE_MAPPING(SH_FBYTE,   ShFracByte); 
SH_VALUE_STORAGE_TYPE_MAPPING(SH_FSHORT,  ShFracShort); 
SH_VALUE_STORAGE_TYPE_MAPPING(SH_FINT,    ShFracInt); 
SH_VALUE_STORAGE_TYPE_MAPPING(SH_FUBYTE,  ShFracUByte); 
SH_VALUE_STORAGE_TYPE_MAPPING(SH_FUSHORT, ShFracUShort); 
SH_VALUE_STORAGE_TYPE_MAPPING(SH_FUINT,   ShFracUInt); 

// @}

template<typename T> struct __ShStorageTypeName { static const char* name; };
template<typename T> const char* __ShStorageTypeName<T>::name = "unknown";

#define SH_STORAGETYPE_NAME_SPEC(T)\
  template<> struct SH_DLLEXPORT __ShStorageTypeName<T > { static const char* name; };

SH_STORAGETYPE_NAME_SPEC(ShHalf);
SH_STORAGETYPE_NAME_SPEC(float);
SH_STORAGETYPE_NAME_SPEC(double);

SH_STORAGETYPE_NAME_SPEC(char);
SH_STORAGETYPE_NAME_SPEC(short);
SH_STORAGETYPE_NAME_SPEC(int);
SH_STORAGETYPE_NAME_SPEC(unsigned char);
SH_STORAGETYPE_NAME_SPEC(unsigned short);
SH_STORAGETYPE_NAME_SPEC(unsigned int);

SH_STORAGETYPE_NAME_SPEC(ShFracByte);
SH_STORAGETYPE_NAME_SPEC(ShFracShort);
SH_STORAGETYPE_NAME_SPEC(ShFracInt);
SH_STORAGETYPE_NAME_SPEC(ShFracUByte);
SH_STORAGETYPE_NAME_SPEC(ShFracUShort);
SH_STORAGETYPE_NAME_SPEC(ShFracUInt);

#undef SH_STORAGETYPE_NAME_SPEC




template<typename T>
struct ShIsFraction: public MatchTemplateType<T, ShFraction> {};

template<ShValueType V>
struct __ShRegularValueType 
{
  static const ShValueType type = (V & ~SH_VALUETYPE_SPECIAL_MASK); 
};

template<typename T>
struct __ShRegularStorageType
{
  static const ShValueType range_value_type = __ShStorageToValueType<T>::type;
  static const ShValueType value_type = __ShRegularValueType<range_value_type>::type; 
  typedef typename __ShValueToStorageType<value_type>::type type; 
};

inline 
ShValueType shRegularValueType(ShValueType value_type); 
// @}

template<typename T1, typename T2>
struct ShCommonType;

template<typename T1, typename T2, typename T3>
struct ShCommonType3 {
  typedef typename ShCommonType<typename ShCommonType<T1, T2>::type, T3>::type type; 
};

template<typename T1, typename T2, typename T3, typename T4>
struct ShCommonType4 {
  typedef typename ShCommonType<typename ShCommonType<T1, T2>::type, 
                                typename ShCommonType<T3, T4>::type>::type type; 
};
// @}

template<typename T>
struct ShStorageTypeInfo {
  typedef T storage_type;
  static const ShValueType value_type = __ShStorageToValueType<T>::type; 


  typedef typename __ShRegularStorageType<T>::type RegularType;
  static const ShValueType RegularValueType = __ShStorageToValueType<RegularType>::type;

  // @todo not sure we want all of these here, since there could be user-defined 
  // special types too.  This might be too restrictive if we depend on these. 

  static const char* name; 

  // @todo type include here the ability to set available operations 

  // @todo type include here ShPrograms for transforming from this
  // storage type to a set of different ones, allowing the transformers
  // to choose the best conversions.

  // once the above two things are complete, than user-defined types should
  // work just fine.
};

template<typename T>
const char* ShStorageTypeInfo<T>::name = __ShStorageTypeName<T>::name;



template<ShValueType V>
struct ShValueTypeInfo: public ShStorageTypeInfo<typename __ShValueToStorageType<V>::type> {
};

}

#include "ShStorageTypeImpl.hpp"

#endif

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