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Swizzle updates to handle non-POD types (e.g. hvec3) correctly

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This commit is contained in:
athile
2011-09-20 22:21:15 -04:00
parent f09aa1c177
commit 6022ff616e
5 changed files with 80 additions and 29 deletions
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36
glm/core/_swizzle.hpp
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@@ -53,7 +53,7 @@ namespace detail
for (int i = 0; i < N; ++i)
t[i] = that[i];
for (int i = 0; i < N; ++i)
e[offset_dst[i]] = t[i];
elem(offset_dst[i]) = t[i];
return *this;
}
@@ -63,12 +63,18 @@ namespace detail
static const int offset_dst[4] = { E0, E1, E2, E3 };
for (int i = 0; i < N; ++i)
e[offset_dst[i]] = t;
elem(offset_dst[i]) = t;
return *this;
}
Type e[N];
protected:
Type& elem (size_t i) { return (reinterpret_cast<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
// constructor calls
char _buffer[sizeof(Type) * N];
};
template <typename Type, typename Class, int N, int E0, int E1, int E2, int E3>
@@ -76,8 +82,10 @@ namespace detail
{
struct Stub {};
swizzle_base& operator= (const Stub& that) {}
Type e[N];
protected:
Type& elem (size_t i) { return (reinterpret_cast<Type*>(_buffer))[i]; }
char _buffer[sizeof(Type) * N];
};
//! Internal class for implementing swizzle operators
@@ -85,7 +93,7 @@ namespace detail
struct swizzle2 : public swizzle_base<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->e[E0], this->e[E1]); }
operator P () { return P(this->elem(E0), this->elem(E1)); }
};
//! Internal class for implementing swizzle operators
@@ -93,7 +101,7 @@ namespace detail
struct swizzle2_3 : public swizzle_base<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->e[E0], this->e[E1], this->e[E2]); }
operator P () { return P(this->elem(E0), this->elem(E1), this->elem(E2)); }
};
//! Internal class for implementing swizzle operators
@@ -101,7 +109,7 @@ namespace detail
struct swizzle2_4 : public swizzle_base<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->e[E0], this->e[E1], this->e[E2], this->e[E3]); }
operator P () { return P(this->elem(E0), this->elem(E1), this->elem(E2), this->elem(E3)); }
};
//! Internal class for implementing swizzle operators
@@ -109,7 +117,7 @@ namespace detail
struct swizzle3 : public swizzle_base<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->e[E0], this->e[E1], this->e[E2]); }
operator P () { return P(this->elem(E0), this->elem(E1), this->elem(E2)); }
};
//! Internal class for implementing swizzle operators
@@ -117,7 +125,7 @@ namespace detail
struct swizzle3_2 : public swizzle_base<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->e[E0], this->e[E1]); }
operator P () { return P(this->elem(E0), this->elem(E1)); }
};
//! Internal class for implementing swizzle operators
@@ -125,7 +133,7 @@ namespace detail
struct swizzle3_4 : public swizzle_base<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->e[E0], this->e[E1], this->e[E2], this->e[E3]); }
operator P () { return P(this->elem(E0), this->elem(E1), this->elem(E2), this->elem(E3)); }
};
//! Internal class for implementing swizzle operators
@@ -133,7 +141,7 @@ namespace detail
struct swizzle4 : public swizzle_base<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->e[E0], this->e[E1], this->e[E2], this->e[E3]); }
operator P () { return P(this->elem(E0), this->elem(E1), this->elem(E2), this->elem(E3)); }
};
//! Internal class for implementing swizzle operators
@@ -141,7 +149,7 @@ namespace detail
struct swizzle4_2 : public swizzle_base<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->e[E0], this->e[E1]); }
operator P () { return P(this->elem(E0), this->elem(E1)); }
};
@@ -150,7 +158,7 @@ namespace detail
struct swizzle4_3 : public swizzle_base<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->e[E0], this->e[E1], this->e[E2]); }
operator P () { return P(this->elem(E0), this->elem(E1), this->elem(E2)); }
};
}//namespace detail