Add static constants for vec3

- Tests, too

glm/detail/type_vec3.hpp

@@ -58,6 +58,15 @@ namespace glm
 			static GLM_RELAXED_CONSTEXPR precision prec = P;
 #		endif//GLM_META_PROG_HELPERS
 
+		static const type ZERO;
+		static const type X;
+		static const type Y;
+		static const type Z;
+		static const type XY;
+		static const type XZ;
+		static const type YZ;
+		static const type XYZ;
+
 		// -- Data --
 
 #		if GLM_HAS_ANONYMOUS_UNION

glm/detail/type_vec3.inl

@@ -32,6 +32,30 @@
 
 namespace glm
 {
+template <typename T, precision P>
+const tvec3<T, P> tvec3<T, P>::ZERO = tvec3<T, P>(static_cast<T>(0), static_cast<T>(0), static_cast<T>(0));
+
+template <typename T, precision P>
+const tvec3<T, P> tvec3<T, P>::X = tvec3<T, P>(static_cast<T>(1), static_cast<T>(0), static_cast<T>(0));
+
+template <typename T, precision P>
+const tvec3<T, P> tvec3<T, P>::Y = tvec3<T, P>(static_cast<T>(0), static_cast<T>(1), static_cast<T>(0));
+
+template <typename T, precision P>
+const tvec3<T, P> tvec3<T, P>::Z = tvec3<T, P>(static_cast<T>(0), static_cast<T>(0), static_cast<T>(1));
+
+template <typename T, precision P>
+const tvec3<T, P> tvec3<T, P>::XY = tvec3<T, P>(static_cast<T>(1), static_cast<T>(1), static_cast<T>(0));
+
+template <typename T, precision P>
+const tvec3<T, P> tvec3<T, P>::XZ = tvec3<T, P>(static_cast<T>(1), static_cast<T>(0), static_cast<T>(1));
+
+template <typename T, precision P>
+const tvec3<T, P> tvec3<T, P>::YZ = tvec3<T, P>(static_cast<T>(0), static_cast<T>(1), static_cast<T>(1));
+
+template <typename T, precision P>
+const tvec3<T, P> tvec3<T, P>::XYZ = tvec3<T, P>(static_cast<T>(1), static_cast<T>(1), static_cast<T>(1));
+
 	// -- Implicit basic constructors --
 
 #	if !GLM_HAS_DEFAULTED_FUNCTIONS || !defined(GLM_FORCE_NO_CTOR_INIT)

test/core/core_type_vec3.cpp

@@ -493,6 +493,21 @@ int test_operator_increment()
 	return Error;
 }
 
+int test_vec3_static_const() {
+	int Error(0);
+
+	Error += (glm::ivec3(0, 0, 0) == glm::ivec3::ZERO) ? 0 : 1;
+	Error += (glm::vec3(1, 0, 0) == glm::vec3::X) ? 0 : 1;
+	Error += (glm::bvec3(false, true, false) == glm::bvec3::Y) ? 0 : 1;
+	Error += (glm::bvec3(false, false, true) == glm::bvec3::Z) ? 0 : 1;
+	Error += (glm::dvec3(1, 1, 0) == glm::dvec3::XY) ? 0 : 1;
+	Error += (glm::vec3(1, 0, 1) == glm::vec3::XZ) ? 0 : 1;
+	Error += (glm::uvec3(0u, 1u, 1u) == glm::uvec3::YZ) ? 0 : 1;
+	Error += (glm::dvec3(1, 1, 1) == glm::dvec3::XYZ) ? 0 : 1;
+
+	return Error;
+}
+
 int main()
 {
 	int Error = 0;
@@ -505,6 +520,7 @@ int main()
 		assert(glm::vec3::components == 3);
 #	endif
 
+	Error += test_vec3_static_const();
 	Error += test_vec3_ctor();
 	Error += test_vec3_operators();
 	Error += test_vec3_size();