Added cast from Half types to any scalar types

glm/core/type_half.hpp

@@ -22,7 +22,7 @@
 ///
 /// @ref core
 /// @file glm/core/type_half.hpp
-/// @date 2008-08-17 / 2011-06-15
+/// @date 2008-08-17 / 2011-09-20
 /// @author Christophe Riccio
 ///////////////////////////////////////////////////////////////////////////////////
 
@@ -40,7 +40,7 @@ namespace detail
 	hdata toFloat16(float const & value);
 
 	/// 16-bit floating point type.
-	/// \ingroup gtc_half_float
+	/// @ingroup gtc_half_float
 	class thalf
 	{
 	public: 
@@ -52,10 +52,8 @@ namespace detail
 		GLM_FUNC_DECL explicit thalf(U const & s);
 
 		// Cast
-		//operator float();
+		template <typename U>
-		//GLM_FUNC_DECL operator float() const;
+		GLM_FUNC_DECL operator U() const;
-		//operator double();
-		//operator double() const;
 
 		// Unary updatable operators
 		GLM_FUNC_DECL thalf& operator= (thalf const & s);

glm/core/type_half.inl

@@ -269,6 +269,12 @@ namespace detail
 		data(toFloat16(float(s)))
 	{}
 
+	template <typename U>
+	GLM_FUNC_QUALIFIER thalf::operator U() const
+	{
+		return static_cast<U>(this->toFloat());
+	}
+
 	// Cast
 	//GLM_FUNC_QUALIFIER half::operator float()
 	//{

test/core/core_type_half.cpp

@@ -2,7 +2,7 @@
 // OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 // Created : 2008-08-31
-// Updated : 2010-08-25
+// Updated : 2011-09-20
 // Licence : This source is under MIT licence
 // File    : test/core/type_half.cpp
 ///////////////////////////////////////////////////////////////////////////////////////////////////
@@ -10,24 +10,107 @@
 #include <glm/glm.hpp>
 #include <glm/gtc/half_float.hpp>
 
+int test_half_ctor()
+{
+	int Error = 0;
+
+	glm::half A(1.0f);
+	Error += A.toFloat() == 1.0f ? 0 : 1;
+
+	glm::half B = glm::half(1.0f);
+	Error += B.toFloat() == 1.0f ? 0 : 1;
+
+	glm::half C = B;
+	Error += C.toFloat() == 1.0f ? 0 : 1;
+
+	return Error;
+}
+
+int test_half_cast()
+{
+	int Error = 0;
+
+	glm::half A(2.0f);
+	Error += A.toFloat() == 2.0f ? 0 : 1;
+
+	glm::half B(2.0);
+	Error += B.toFloat() == 2.0f ? 0 : 1;
+
+	glm::half C(2);
+	Error += C.toFloat() == 2.0f ? 0 : 1;
+
+	float D(A);
+	Error += D == 2.0f ? 0 : 1;
+
+	double E(A);
+	Error += E == 2.0 ? 0 : 1;
+
+	int F(A);
+	Error += F == 2.0 ? 0 : 1;
+
+	return Error;
+}
+
+int test_half_relational()
+{
+	int Error = 0;
+
+	glm::half A(1.0f);
+	glm::half B(2.0f);
+
+	Error += !(A == B) ? 0 : 1;
+	Error +=  (A != B) ? 0 : 1;
+	Error +=  (A <= B) ? 0 : 1;
+	Error +=  (A  < B) ? 0 : 1;
+	Error += !(A >= B) ? 0 : 1;
+	Error += !(A  > B) ? 0 : 1;
+
+	return Error;
+}
+
+int test_half_arithmetic_unary_ops()
+{
+	int Error = 0;
+
+	glm::half A(2.0f);
+	glm::half B(3.0f);
+
+	Error += A + B == glm::half( 5.0f) ? 0 : 1;
+	Error += A - B == glm::half(-1.0f) ? 0 : 1;
+	Error += B - A == glm::half( 1.0f) ? 0 : 1;
+	Error += A * B == glm::half( 6.0f) ? 0 : 1;
+	Error += A / B == glm::half(2.0f / 3.0f) ? 0 : 1;
+	Error += B / A == glm::half(3.0f / 2.0f) ? 0 : 1;
+
+	return Error;
+}
+
+int test_half_arithmetic_binary_ops()
+{
+	int Error = 0;
+
+	glm::half A(2.0f);
+	glm::half B(3.0f);
+
+	Error += A + B == glm::half( 5.0f) ? 0 : 1;
+	Error += A - B == glm::half(-1.0f) ? 0 : 1;
+	Error += B - A == glm::half( 1.0f) ? 0 : 1;
+	Error += A * B == glm::half( 6.0f) ? 0 : 1;
+	Error += A / B == glm::half(2.0f / 3.0f) ? 0 : 1;
+	Error += B / A == glm::half(3.0f / 2.0f) ? 0 : 1;
+
+	return Error;
+}
+
 int main()
 {
 	int Result = 0;
 
-	glm::half A(1.0f);
+	Result += test_half_ctor();
-	glm::half B(2.0f);
+	Result += test_half_cast();
-	glm::half C = A + B;
+	Result += test_half_relational();
-	glm::half D(C);
+	Result += test_half_arithmetic_unary_ops();
-	float E = D.toFloat();
+	Result += test_half_arithmetic_binary_ops();
-	int F = C.toFloat();
-	Result += float(F) == E ? 0 : 1;
-	glm::half G = B * C;
-	glm::half H = G / C;
-	H += glm::half(1.0f);
-	double J = H.toFloat();
-	int I = H.toFloat();
-	Result += J == 3.0 ? 0 : 1;
-	Result += I == 3 ? 0 : 1;
 	
 	return Result;
 }