source: trunk/nv/types.hh @ 61

// Copyright (C) 2012 Kornel Kisielewicz
// This file is part of NV Libraries.
// For conditions of distribution and use, see copyright notice in nv.hh

#ifndef NV_TYPES_HH
#define NV_TYPES_HH

#include <glm/glm.hpp>
#include <nv/common.hh>
#include <nv/object.hh>
#include <type_traits>
#include <utility>
#include <unordered_map>
#include <vector>
#include <string>

#define NV_REGISTER_NAME( s ) template <> inline const char* nv::get_type_name<s>   () { return #s; }

namespace nv
{

        enum type
        {
                INT,
                BYTE,
                SHORT,
                UINT,
                UBYTE,
                USHORT,
                FLOAT,
                FLOAT_VECTOR_2,
                FLOAT_VECTOR_3,
                FLOAT_VECTOR_4,
                FLOAT_MATRIX_2,
                FLOAT_MATRIX_3,
                FLOAT_MATRIX_4,
                INT_VECTOR_2,
                INT_VECTOR_3,
                INT_VECTOR_4
        };

        typedef glm::vec2 vec2;
        typedef glm::vec3 vec3;
        typedef glm::vec4 vec4;

        typedef glm::ivec2 ivec2;
        typedef glm::ivec3 ivec3;
        typedef glm::ivec4 ivec4;

        typedef glm::mat2 mat2;
        typedef glm::mat3 mat3;
        typedef glm::mat4 mat4;

        template < type EnumType > struct enum_to_type {};

        template <> struct enum_to_type< INT >   { typedef int type; };
        template <> struct enum_to_type< UINT >  { typedef unsigned int type; };
        template <> struct enum_to_type< SHORT > { typedef short type; };
        template <> struct enum_to_type< USHORT >{ typedef unsigned short type; };
        template <> struct enum_to_type< BYTE >  { typedef char type; };
        template <> struct enum_to_type< UBYTE > { typedef unsigned char type; };
        template <> struct enum_to_type< FLOAT > { typedef f32 type; };

        template <> struct enum_to_type< FLOAT_VECTOR_2 > { typedef vec2 type; };
        template <> struct enum_to_type< FLOAT_VECTOR_3 > { typedef vec3 type; };
        template <> struct enum_to_type< FLOAT_VECTOR_4 > { typedef vec4 type; };

        template <> struct enum_to_type< INT_VECTOR_2 > { typedef ivec2 type; };
        template <> struct enum_to_type< INT_VECTOR_3 > { typedef ivec3 type; };
        template <> struct enum_to_type< INT_VECTOR_4 > { typedef ivec4 type; };

        template <> struct enum_to_type< FLOAT_MATRIX_2 > { typedef mat2 type; };
        template <> struct enum_to_type< FLOAT_MATRIX_3 > { typedef mat3 type; };
        template <> struct enum_to_type< FLOAT_MATRIX_4 > { typedef mat4 type; };

        template < typename TYPE > struct type_to_enum {};

        template <> struct type_to_enum< int >           { static const type type = INT; };
        template <> struct type_to_enum< unsigned int >  { static const type type = UINT; };
        template <> struct type_to_enum< short >         { static const type type = SHORT; };
        template <> struct type_to_enum< unsigned short >{ static const type type = USHORT; };
        template <> struct type_to_enum< char >          { static const type type = BYTE; };
        template <> struct type_to_enum< unsigned char > { static const type type = UBYTE; };
        template <> struct type_to_enum< f32 > { static const type type = FLOAT; };

        template <> struct type_to_enum< vec2 > { static const type type = FLOAT_VECTOR_2; };
        template <> struct type_to_enum< vec3 > { static const type type = FLOAT_VECTOR_3; };
        template <> struct type_to_enum< vec4 > { static const type type = FLOAT_VECTOR_4; };

        template <> struct type_to_enum< ivec2 > { static const type type = INT_VECTOR_2; };
        template <> struct type_to_enum< ivec3 > { static const type type = INT_VECTOR_3; };
        template <> struct type_to_enum< ivec4 > { static const type type = INT_VECTOR_4; };

        template <> struct type_to_enum< mat2 > { static const type type = FLOAT_MATRIX_2; };
        template <> struct type_to_enum< mat3 > { static const type type = FLOAT_MATRIX_3; };
        template <> struct type_to_enum< mat4 > { static const type type = FLOAT_MATRIX_4; };

        template <typename TYPE>
    inline const char* get_type_name()
    {
        static_assert( false, "Type not implemented!" );
    }

        template <> inline const char* get_type_name<int>   () { return "sint"; }
    template <> inline const char* get_type_name<sint8> () { return "sint8"; }
    template <> inline const char* get_type_name<sint16>() { return "sint16"; }
    template <> inline const char* get_type_name<sint32>() { return "sint32"; }
    template <> inline const char* get_type_name<sint64>() { return "sint64"; }

        template <> inline const char* get_type_name<unsigned int>() { return "uint"; }
        template <> inline const char* get_type_name<uint8> ()       { return "uint8"; }
    template <> inline const char* get_type_name<uint16>()       { return "uint16"; }
    template <> inline const char* get_type_name<uint32>()       { return "uint32"; }
    template <> inline const char* get_type_name<uint64>()       { return "uint64"; }

        template <> inline const char* get_type_name<f32> () { return "f32"; }
        template <> inline const char* get_type_name<f64> () { return "f64"; }

        template <> inline const char* get_type_name< vec2 > () { return "vec2"; }
        template <> inline const char* get_type_name< vec3 > () { return "vec3"; }
        template <> inline const char* get_type_name< vec4 > () { return "vec4"; }

        template <> inline const char* get_type_name< ivec2 > () { return "ivec2"; }
        template <> inline const char* get_type_name< ivec3 > () { return "ivec3"; }
        template <> inline const char* get_type_name< ivec4 > () { return "ivec4"; }

        template <> inline const char* get_type_name< mat2 > () { return "mat2"; }
        template <> inline const char* get_type_name< mat3 > () { return "mat3"; }
        template <> inline const char* get_type_name< mat4 > () { return "mat4"; }

        template <> inline const char* get_type_name<bool> () { return "bool"; }

        template <> inline const char* get_type_name<std::string> () { return "string"; }
        template <> inline const char* get_type_name<object>      () { return "object"; }

        template<typename T>
        struct is_container
        {
        private:
                typedef char                      yes;
                typedef struct { char array[2]; } no;
                template<typename C> static yes test(typename C::iterator*);
                template<typename C> static no  test(...);
        public:
                static const bool value = sizeof(test<T>(0)) == sizeof(yes);
        };

        template<>
        struct is_container< std::string > {
                static const bool value = false;
        };


        template <typename TYPE>
    std::size_t get_type_id()
    {
        static std::size_t type_id = std::hash<std::string>()(std::string(get_type_name<TYPE>()));
        return type_id;
    };

        struct hash_string
    {
        std::size_t hash;
        const char* text;
                hash_string() {}
                hash_string( const char* a_text ) : 
                        text( a_text ) 
                {
                        hash = std::hash<std::string>()( std::string( a_text ) ); 
                }
                inline bool operator == (const hash_string& hs ) const
                {
                        return hs.hash == hash;
                }
    };

}

namespace std {
        template<>
        struct hash<nv::hash_string> {
                size_t operator()(const nv::hash_string &hs) const 
                {
                        return hs.hash;
                }
        };
}

namespace nv
{
        struct type_entry;

        enum type_flag
        {
                TF_POINTER      = 0x01, //< field is a pointer
                TF_NOSERIALIZE  = 0x02, //< ignore during serialization
                TF_INVISIBLE    = 0x04, //< field invisible to API
                TF_READONLY     = 0x08, //< read only field
                TF_SIMPLETYPE   = 0x10, //< raw binary I/O possible
                TF_OWNED        = 0x20,
                TF_CONTAINER    = 0x40, //< is a container
        };

        struct type_field
        {
                hash_string  name;      //< name of the field
                hash_string  type_name; //< name of the type of the field
                type_entry*  type;      //< pointer to field type
                unsigned int flags;     //< flags 
                size_t       offset;

                template< typename TOBJECT, typename TFIELD >
                type_field( hash_string name, TFIELD TOBJECT::*field, typename std::enable_if< is_container<TFIELD>::value, void* >::type = nullptr )
                        : name(name)
                        , type_name( get_type_name< std::remove_pointer<TFIELD::value_type>::type >() )
                        , type( nullptr )
                        , flags( 0 )
                        , offset( offsetof( TOBJECT, *field ) )
                        // NOTE: if offsetof behaves badly, check offset_of in common.hh
                {
                        flags = TF_CONTAINER |
                                ( std::is_pointer<TFIELD::value_type>::value ? TF_POINTER : 0 ) |
                                ( std::is_pod<TFIELD::value_type>::value ? TF_SIMPLETYPE : 0 );
                }

                template< typename TOBJECT, typename TFIELD >
                type_field( hash_string name, TFIELD TOBJECT::*field, typename std::enable_if< !is_container<TFIELD>::value, void* >::type = nullptr )
                        : name(name)
                        , type_name( get_type_name< std::remove_pointer<TFIELD>::type >() )
                        , type( nullptr )
                        , flags( 0 )
                        , offset( offsetof( TOBJECT, *field ) )
                        // NOTE: if offsetof behaves badly, check offset_of in common.hh
                {
                        flags = 
                                ( std::is_pointer<TFIELD>::value ? TF_POINTER : 0 ) |
                                ( std::is_pod<TFIELD>::value ? TF_SIMPLETYPE : 0 );
                }

                type_field& flag( unsigned int f )
                {
                        flags |= f;
                        return *this;
                }
        };

        struct type_enum
        {
                hash_string name;
                int         value;
                type_enum( hash_string name, int value ) : name(name), value(value) {}
        };

    struct type_entry
    {
                 // Function types for the constructor and destructor of registered types
            typedef void (*constructor_func)(void*);
            typedef void (*destructor_func)(void*);

                // Parent type database
        class type_database* type_db;

        // Scoped C++ name of the type
        hash_string name;
 
        // Pointers to the constructor and destructor functions
        constructor_func constructor;
        destructor_func  destructor;
 
        // Result of sizeof(type) operation
        size_t size;

                // Base type
                type_entry* base_type;

                // Field list
                std::vector<type_field> field_list;

                // Enum list
                std::vector<type_enum> enum_list;

                template <int TYPE>
                type_entry& base()
                {
                        base_type = type_db->get_type( get_type_name<TYPE>() )
                }

                template <int SIZE>
                type_entry& fields( type_field (&init_fields)[SIZE] )
                {
                        for (int i = 0; i < SIZE; i++)
                        {
                                type_field f = init_fields[i];
                                f.type = type_db->get_type(f.type_name);
                                field_list.push_back(f);
                        }
                        return *this;
                }

                template <int SIZE>
                type_entry& enums( type_enum (&init_enums)[SIZE] )
                {
                        for (int i = 0; i < SIZE; i++)
                        {
                                enum_list.push_back( init_enums[i] )
                        }
                        return *this;
                }
    };

    class type_database
    {
    public:
                template< typename TYPE >
        type_entry& create_type()
                {
                        hash_string name( get_type_name<TYPE>() );
                        type_entry* i_type = nullptr;
                        type_map::iterator it = m_types.find( name );
                        if ( it != m_types.end() ) 
                        {
                                return *(it->second);
                        }
                        i_type          = new type_entry;
                        i_type->type_db = this;
                        i_type->name    = name;
                        i_type->size    = sizeof(TYPE);
                        
                        i_type->constructor = ConstructObject<TYPE>;
                        i_type->destructor  = DestructObject<TYPE>;

                        m_types[name] = i_type;
                        return *i_type;
                }

        type_entry* get_type( hash_string name )
                {
                        type_map::iterator it = m_types.find( name );
                        if ( it != m_types.end() ) 
                        {
                                return it->second;
                        }
                        return nullptr;
                }
    private:
        typedef std::unordered_map<hash_string, type_entry*> type_map;
        type_map m_types;
        };

        template <typename TYPE> void ConstructObject(void* object)
    {
        // Use placement new to call the constructor
        new (object) TYPE;
    }
    template <typename TYPE> void DestructObject(void* object)
    {
        // Explicit call of the destructor
        ((TYPE*)object)->TYPE::~TYPE();
    }

}

#endif