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

glm/core/_swizzle.hpp

@@ -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>
@@ -77,7 +83,9 @@ 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 

glm/core/type_vec2.hpp

@@ -48,10 +48,6 @@ namespace detail
 #		elif(GLM_COMPONENT == GLM_COMPONENT_MS_EXT)
 		union 
 		{
-			struct{value_type x, y;};
-			struct{value_type r, g;};
-			struct{value_type s, t;};
-
             _GLM_SWIZZLE2_2_MEMBERS(value_type,glm::detail::tvec2<value_type>,x,y)
             _GLM_SWIZZLE2_2_MEMBERS(value_type,glm::detail::tvec2<value_type>,r,g)
             _GLM_SWIZZLE2_2_MEMBERS(value_type,glm::detail::tvec2<value_type>,s,t)
@@ -61,6 +57,10 @@ namespace detail
             _GLM_SWIZZLE2_4_MEMBERS(value_type,glm::detail::tvec4<value_type>,x,y)
             _GLM_SWIZZLE2_4_MEMBERS(value_type,glm::detail::tvec4<value_type>,r,g)
             _GLM_SWIZZLE2_4_MEMBERS(value_type,glm::detail::tvec4<value_type>,s,t)
+
+			struct{value_type r, g;};
+			struct{value_type s, t;};
+			struct{value_type x, y;};
 		};
 #		else//(GLM_COMPONENT == GLM_COMPONENT_GLSL_NAMES)
 		union {value_type x, r, s;};

glm/core/type_vec3.hpp

@@ -48,10 +48,6 @@ namespace detail
 #	elif(GLM_COMPONENT == GLM_COMPONENT_MS_EXT)
 		union 
 		{
-			struct{value_type x, y, z;};
-			struct{value_type r, g, b;};
-			struct{value_type s, t, p;};
-
             _GLM_SWIZZLE3_2_MEMBERS(value_type,glm::detail::tvec2<value_type>,x,y,z)
             _GLM_SWIZZLE3_2_MEMBERS(value_type,glm::detail::tvec2<value_type>,r,g,b)
             _GLM_SWIZZLE3_2_MEMBERS(value_type,glm::detail::tvec2<value_type>,s,t,p)
@@ -61,6 +57,10 @@ namespace detail
             _GLM_SWIZZLE3_4_MEMBERS(value_type,glm::detail::tvec4<value_type>,x,y,z)
             _GLM_SWIZZLE3_4_MEMBERS(value_type,glm::detail::tvec4<value_type>,r,g,b)
             _GLM_SWIZZLE3_4_MEMBERS(value_type,glm::detail::tvec4<value_type>,s,t,p)
+
+			struct{value_type r, g, b;};
+			struct{value_type s, t, p;};
+			struct{value_type x, y, z;};
         };
 #	else//(GLM_COMPONENT == GLM_COMPONENT_GLSL_NAMES)
 		union {value_type x, r, s;};

glm/core/type_vec4.hpp

@@ -48,10 +48,6 @@ namespace detail
 #	elif(GLM_COMPONENT == GLM_COMPONENT_MS_EXT)
 		union 
 		{
-			struct{value_type x, y, z, w;};
-			struct{value_type r, g, b, a;};
-			struct{value_type s, t, p, q;};
-
             _GLM_SWIZZLE4_2_MEMBERS(value_type,glm::detail::tvec2<value_type>,x,y,z,w)
             _GLM_SWIZZLE4_2_MEMBERS(value_type,glm::detail::tvec2<value_type>,r,g,b,a)
             _GLM_SWIZZLE4_2_MEMBERS(value_type,glm::detail::tvec2<value_type>,s,t,p,q)
@@ -61,6 +57,10 @@ namespace detail
             _GLM_SWIZZLE4_4_MEMBERS(value_type,glm::detail::tvec4<value_type>,x,y,z,w)
             _GLM_SWIZZLE4_4_MEMBERS(value_type,glm::detail::tvec4<value_type>,r,g,b,a)
             _GLM_SWIZZLE4_4_MEMBERS(value_type,glm::detail::tvec4<value_type>,s,t,p,q)
+
+			struct{value_type r, g, b, a;};
+			struct{value_type s, t, p, q;};
+			struct{value_type x, y, z, w;};
 		};
 #	else//(GLM_COMPONENT == GLM_COMPONENT_GLSL_NAMES)
 		union {value_type x, r, s;};

test/core/core_type_vec3.cpp

@@ -8,6 +8,7 @@
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 #include <glm/glm.hpp>
+#include <glm/gtc/half_float.hpp>
 
 static int test_vec3_operators()
 {
@@ -95,7 +96,6 @@ int test_vec3_swizzle3_2()
     return Error;
 }
 
-
 int test_vec3_swizzle3_3()
 {
     int Error = 0;
@@ -130,6 +130,48 @@ int test_vec3_swizzle3_3()
     return Error;
 }
 
+int test_vec3_swizzle_half()
+{
+    int Error = 0;
+
+    glm::half a1(1);
+    glm::half b1(2);
+    glm::half c1(3);
+    glm::hvec3 v(a1, b1, c1);
+    glm::hvec3 u;
+
+    float c = v.x;
+    float d = v.y;
+    u = v;
+
+    float a = u.x;
+    float b = u.y;
+    Error += (u.x == 1.0f && u.y == 2.0f && u.z == 3.0f) ? 0 : 1;
+    
+    /*u = v.xyz;
+    Error += (u.x == 1.0f && u.y == 2.0f && u.z == 3.0f) ? 0 : 1;
+    u = v.zyx;
+    Error += (u.x == 3.0f && u.y == 2.0f && u.z == 1.0f) ? 0 : 1;
+    u.zyx = v;
+    Error += (u.x == 3.0f && u.y == 2.0f && u.z == 1.0f) ? 0 : 1;
+    
+    u = v.rgb;
+    Error += (u.x == 1.0f && u.y == 2.0f && u.z == 3.0f) ? 0 : 1;
+    u = v.bgr;
+    Error += (u.x == 3.0f && u.y == 2.0f && u.z == 1.0f) ? 0 : 1;
+    u.bgr = v;
+    Error += (u.x == 3.0f && u.y == 2.0f && u.z == 1.0f) ? 0 : 1;
+
+    u = v.stp;
+    Error += (u.x == 1.0f && u.y == 2.0f && u.z == 3.0f) ? 0 : 1;
+    u = v.pts;
+    Error += (u.x == 3.0f && u.y == 2.0f && u.z == 1.0f) ? 0 : 1;
+    u.pts = v;
+    Error += (u.x == 3.0f && u.y == 2.0f && u.z == 1.0f) ? 0 : 1;*/
+
+    return Error;
+}
+
 int main()
 {
 	int Error = 0;
@@ -138,6 +180,7 @@ int main()
 	Error += test_vec3_size();
     Error += test_vec3_swizzle3_2();
     Error += test_vec3_swizzle3_3();
+    Error += test_vec3_swizzle_half();
 	
 	return Error;
 }