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Start implementation for swizzle operaators. operator+ and operator- have been added.

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athile
2011-09-21 12:19:27 -04:00
parent d942261f23
commit 5d3c6fb4ca
2 changed files with 98 additions and 58 deletions
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103
glm/core/_swizzle.hpp
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@@ -61,9 +61,11 @@ namespace detail
N = number of components in the vector (e.g. 3)
E0...3 = what index the n-th element of this swizzle refers to
*/
template <typename Type, typename Class, int N, int E0, int E1, int E2, int E3, int DUPLICATE_ELEMENTS>
template <typename Derived, typename Type, typename Class, int N, int E0, int E1, int E2, int E3, int DUPLICATE_ELEMENTS>
struct swizzle_base
{
typedef Derived derived_type;
swizzle_base& operator= (const Class& that)
{
static const int offset_dst[4] = { E0, E1, E2, E3 };
@@ -88,101 +90,136 @@ namespace detail
}
protected:
Type& elem (size_t i) { return (reinterpret_cast<Type*>(_buffer))[i]; }
Type& elem (size_t i) { return (reinterpret_cast<Type*>(_buffer))[i]; }
const Type& elem (size_t i) const { return (reinterpret_cast<const Type*>(_buffer))[i]; }
// Use an opaque buffer to *ensure* the compiler doesn't call a constructor.
// Otherwise, a vec4 containg all swizzles might end up with 1000s of
// Otherwise, a vec4 containing all swizzles might end up with 1000s of
// constructor calls
char _buffer[sizeof(Type) * N];
};
template <typename Type, typename Class, int N, int E0, int E1, int E2, int E3>
struct swizzle_base<Type,Class,N,E0,E1,E2,E3,1>
template <typename Derived, typename Type, typename Class, int N, int E0, int E1, int E2, int E3>
struct swizzle_base<Derived, Type,Class,N,E0,E1,E2,E3,1>
{
typedef Derived derived_type;
struct Stub {};
swizzle_base& operator= (const Stub& that) {}
protected:
Type& elem (size_t i) { return (reinterpret_cast<Type*>(_buffer))[i]; }
Type& elem (size_t i) { return (reinterpret_cast<Type*>(_buffer))[i]; }
const Type& elem (size_t i) const { return (reinterpret_cast<const Type*>(_buffer))[i]; }
char _buffer[sizeof(Type) * N];
};
//! Internal class for implementing swizzle operators
template <typename T, typename P, int E0, int E1>
struct swizzle2 : public swizzle_base<T,P,2,E0,E1,0,0,(E0 == E1)>
struct swizzle2 : public swizzle_base<swizzle2<T,P,E0,E1>, T,P,2,E0,E1,0,0,(E0 == E1)>
{
using swizzle_base<T,P,2,E0,E1,0,0,(E0 == E1)>::operator=;
operator P () { return P(this->elem(E0), this->elem(E1)); }
using swizzle_base<swizzle2<T,P,E0,E1>,T,P,2,E0,E1,0,0,(E0 == E1)>::operator=;
P cast() const { return P(this->elem(E0), this->elem(E1)); }
operator P () const { return cast(); }
};
//! Internal class for implementing swizzle operators
template <typename T, typename P, int E0, int E1, int E2>
struct swizzle2_3 : public swizzle_base<T,P,2,E0,E1,E2,0,1>
struct swizzle2_3 : public swizzle_base<swizzle2_3<T,P,E0,E1,E2>,T,P,2,E0,E1,E2,0,1>
{
using swizzle_base<T,P,2,E0,E1,E2,0,1>::operator=;
operator P () { return P(this->elem(E0), this->elem(E1), this->elem(E2)); }
using swizzle_base<swizzle2_3<T,P,E0,E1,E2>,T,P,2,E0,E1,E2,0,1>::operator=;
P cast() const { return P(this->elem(E0), this->elem(E1), this->elem(E2)); }
operator P () const { return cast(); }
};
//! Internal class for implementing swizzle operators
template <typename T, typename P, int E0, int E1, int E2, int E3>
struct swizzle2_4 : public swizzle_base<T,P,2,E0,E1,E2,E3,1>
struct swizzle2_4 : public swizzle_base<swizzle2_4<T,P,E0,E1,E2,E3>,T,P,2,E0,E1,E2,E3,1>
{
using swizzle_base<T,P,2,E0,E1,E2,E3,1>::operator=;
operator P () { return P(this->elem(E0), this->elem(E1), this->elem(E2), this->elem(E3)); }
using swizzle_base<swizzle2_4<T,P,E0,E1,E2,E3>,T,P,2,E0,E1,E2,E3,1>::operator=;
P cast() const { return P(this->elem(E0), this->elem(E1), this->elem(E2), this->elem(E3)); }
operator P () const { return cast(); }
};
//! Internal class for implementing swizzle operators
template <typename T, typename P, int E0, int E1, int E2>
struct swizzle3 : public swizzle_base<T,P,3,E0,E1,E2,0,(E0==E1||E0==E2||E1==E2)>
struct swizzle3 : public swizzle_base<swizzle3<T,P,E0,E1,E2>,T,P,3,E0,E1,E2,0,(E0==E1||E0==E2||E1==E2)>
{
using swizzle_base<T,P,3,E0,E1,E2,0,(E0==E1||E0==E2||E1==E2)>::operator=;
operator P () { return P(this->elem(E0), this->elem(E1), this->elem(E2)); }
using swizzle_base<swizzle3<T,P,E0,E1,E2>,T,P,3,E0,E1,E2,0,(E0==E1||E0==E2||E1==E2)>::operator=;
P cast() const { return P(this->elem(E0), this->elem(E1), this->elem(E2)); }
operator P () const { return cast(); }
};
//! Internal class for implementing swizzle operators
template <typename T, typename P, int E0, int E1>
struct swizzle3_2 : public swizzle_base<T,P,2,E0,E1,0,0,(E0==E1)>
struct swizzle3_2 : public swizzle_base<swizzle3_2<T,P,E0,E1>,T,P,2,E0,E1,0,0,(E0==E1)>
{
using swizzle_base<T,P,2,E0,E1,0,0,(E0==E1)>::operator=;
operator P () { return P(this->elem(E0), this->elem(E1)); }
using swizzle_base<swizzle3_2<T,P,E0,E1>,T,P,2,E0,E1,0,0,(E0==E1)>::operator=;
P cast() const { return P(this->elem(E0), this->elem(E1)); }
operator P () const { return cast(); }
};
//! Internal class for implementing swizzle operators
template <typename T, typename P, int E0, int E1, int E2, int E3>
struct swizzle3_4 : public swizzle_base<T,P,3,E0,E1,E2,E3,1>
struct swizzle3_4 : public swizzle_base<swizzle3_4<T,P,E0,E1,E2,E3>,T,P,3,E0,E1,E2,E3,1>
{
using swizzle_base<T,P,3,E0,E1,E2,E3,1>::operator=;
operator P () { return P(this->elem(E0), this->elem(E1), this->elem(E2), this->elem(E3)); }
using swizzle_base<swizzle3_4<T,P,E0,E1,E2,E3>,T,P,3,E0,E1,E2,E3,1>::operator=;
P cast() const { return P(this->elem(E0), this->elem(E1), this->elem(E2), this->elem(E3)); }
operator P () const { return cast(); }
};
//! Internal class for implementing swizzle operators
template <typename T, typename P, int E0, int E1, int E2, int E3>
struct swizzle4 : public swizzle_base<T,P,4,E0,E1,E2,E3,(E0==E1||E0==E2||E0==E3||E1==E2||E1==E3||E2==E3)>
struct swizzle4 : public swizzle_base<swizzle4<T,P,E0,E1,E2,E3>,T,P,4,E0,E1,E2,E3,(E0==E1||E0==E2||E0==E3||E1==E2||E1==E3||E2==E3)>
{
using swizzle_base<T,P,4,E0,E1,E2,E3,(E0==E1||E0==E2||E0==E3||E1==E2||E1==E3||E2==E3)>::operator=;
operator P () { return P(this->elem(E0), this->elem(E1), this->elem(E2), this->elem(E3)); }
using swizzle_base<swizzle4<T,P,E0,E1,E2,E3>,T,P,4,E0,E1,E2,E3,(E0==E1||E0==E2||E0==E3||E1==E2||E1==E3||E2==E3)>::operator=;
P cast() const { return P(this->elem(E0), this->elem(E1), this->elem(E2), this->elem(E3)); }
operator P () const { return cast(); }
};
//! Internal class for implementing swizzle operators
template <typename T, typename P, int E0, int E1>
struct swizzle4_2 : public swizzle_base<T,P,2,E0,E1,0,0,(E0==E1)>
struct swizzle4_2 : public swizzle_base<swizzle4_2<T,P,E0,E1>,T,P,2,E0,E1,0,0,(E0==E1)>
{
using swizzle_base<T,P,2,E0,E1,0,0,(E0==E1)>::operator=;
operator P () { return P(this->elem(E0), this->elem(E1)); }
using swizzle_base<swizzle4_2<T,P,E0,E1>,T,P,2,E0,E1,0,0,(E0==E1)>::operator=;
P cast() const { return P(this->elem(E0), this->elem(E1)); }
operator P () const { return cast(); }
};
//! Internal class for implementing swizzle operators
template <typename T, typename P, int E0, int E1, int E2>
struct swizzle4_3 : public swizzle_base<T,P,4,E0,E1,E2,0,(E0==E1||E0==E2||E1==E2)>
struct swizzle4_3 : public swizzle_base<swizzle4_3<T,P,E0,E1,E2>,T,P,4,E0,E1,E2,0,(E0==E1||E0==E2||E1==E2)>
{
using swizzle_base<T,P,4,E0,E1,E2,0,(E0==E1||E0==E2||E1==E2)>::operator=;
operator P () { return P(this->elem(E0), this->elem(E1), this->elem(E2)); }
using swizzle_base<swizzle4_3<T,P,E0,E1,E2>,T,P,4,E0,E1,E2,0,(E0==E1||E0==E2||E1==E2)>::operator=;
P cast() const { return P(this->elem(E0), this->elem(E1), this->elem(E2)); }
operator P () { return cast(); }
};
template <typename T, typename P, int N, typename S0, int E0, int E1, int E2, int E3, int D0, typename S1,int F0, int F1, int F2, int F3, int D1>
typename P operator+ (
const glm::detail::swizzle_base<S0,T,P,N,E0,E1,E2,E3,D0>& a,
const glm::detail::swizzle_base<S1,T,P,N,F0,F1,F2,F3,D1>& b)
{
return static_cast<const S0&>(a).cast() + static_cast<const S1&>(b).cast();
}
template <typename T, typename P, int N, typename S0, int E0, int E1, int E2, int E3, int D0, typename S1,int F0, int F1, int F2, int F3, int D1>
typename P operator- (
const glm::detail::swizzle_base<S0,T,P,N,E0,E1,E2,E3,D0>& a,
const glm::detail::swizzle_base<S1,T,P,N,F0,F1,F2,F3,D1>& b)
{
return static_cast<const S0&>(a).cast() - static_cast<const S1&>(b).cast();
}
}//namespace detail
}//namespace glm
#define _GLM_SWIZZLE2_2_MEMBERS(T,P,E0,E1) \
struct { glm::detail::swizzle2<T,P,0,0> E0 ## E0; }; \
struct { glm::detail::swizzle2<T,P,0,1> E0 ## E1; }; \