Added compScale

glm/gtx/component_wise.hpp

@@ -60,6 +60,9 @@ namespace glm
 	template <typename floatType, typename T, precision P, template <typename, precision> class vecType>
 	GLM_FUNC_DECL vecType<floatType, P> compNormalize(vecType<T, P> const & v);
 
+	template <typename floatType, typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_DECL vecType<T, P> compScale(vecType<floatType, P> const & v);
+
 	/// Add all vector components together. 
 	/// @see gtx_component_wise
 	template <typename genType> 

glm/gtx/component_wise.inl

@@ -67,6 +67,39 @@ namespace detail
 			return v;
 		}
 	};
+
+	template <typename T, typename floatType, precision P, template <typename, precision> class vecType, bool isInteger, bool signedType>
+	struct compute_compScale
+	{};
+
+	template <typename T, typename floatType, precision P, template <typename, precision> class vecType>
+	struct compute_compScale<T, floatType, P, vecType, true, true>
+	{
+		GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<floatType, P> const & v)
+		{
+			floatType const Min = static_cast<floatType>(std::numeric_limits<T>::min());
+			floatType const Max = static_cast<floatType>(std::numeric_limits<T>::max());
+			return (vecType<floatType, P>(v) + Min) * (Max - Min) * static_cast<floatType>(2) - static_cast<floatType>(1);
+		}
+	};
+
+	template <typename T, typename floatType, precision P, template <typename, precision> class vecType>
+	struct compute_compScale<T, floatType, P, vecType, true, false>
+	{
+		GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<floatType, P> const & v)
+		{
+			return vecType<T, P>(vecType<floatType, P>(v) * static_cast<floatType>(std::numeric_limits<T>::max()));
+		}
+	};
+
+	template <typename T, typename floatType, precision P, template <typename, precision> class vecType>
+	struct compute_compScale<T, floatType, P, vecType, false, true>
+	{
+		GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<floatType, P> const & v)
+		{
+			return v;
+		}
+	};
 }//namespace detail
 
 	template <typename floatType, typename T, precision P, template <typename, precision> class vecType>
@@ -77,6 +110,14 @@ namespace detail
 		return detail::compute_compNormalize<T, floatType, P, vecType, std::numeric_limits<T>::is_integer, std::numeric_limits<T>::is_signed>::call(v);
 	}
 
+	template <typename T, typename floatType, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_QUALIFIER vecType<T, P> compScale(vecType<floatType, P> const & v)
+	{
+		GLM_STATIC_ASSERT(std::numeric_limits<floatType>::is_iec559, "'compNormalize' accepts only floating-point types for 'floatType' template parameter");
+
+		return detail::compute_compScale<T, floatType, P, vecType, std::numeric_limits<T>::is_integer, std::numeric_limits<T>::is_signed>::call(v);
+	}
+
 	template <typename T, precision P, template <typename, precision> class vecType>
 	GLM_FUNC_QUALIFIER T compAdd(vecType<T, P> const & v)
 	{

test/gtx/gtx_component_wise.cpp

@@ -35,7 +35,7 @@
 #include <glm/gtc/constants.hpp>
 #include <limits>
 
-namespace integer_8bit_test
+namespace compNormalize
 {
 	int run()
 	{
@@ -59,16 +59,6 @@ namespace integer_8bit_test
 			Error += glm::epsilonEqual(A.w, 1.0f, glm::epsilon<float>()) ? 0 : 1;
 		}
 
-		return Error;
-	}
-}//namespace integer_8bit_test
-
-namespace integer_16bit_test
-{
-	int run()
-	{
-		int Error(0);
-
 		{
 			glm::vec4 const A = glm::compNormalize<float>(glm::u16vec4(
 				std::numeric_limits<glm::u16>::min(),
@@ -97,14 +87,42 @@ namespace integer_16bit_test
 
 		return Error;
 	}
-}//namespace integer_16bit_test
+}//namespace compNormalize
+
+namespace compScale
+{
+	int run()
+	{
+		int Error(0);
+
+		{
+			glm::u8vec4 const A = glm::compScale<glm::u8>(glm::vec4(0.0f, 0.2f, 0.5f, 1.0f));
+
+			Error += A.x == std::numeric_limits<glm::u8>::min() ? 0 : 1;
+			Error += A.y > (std::numeric_limits<glm::u8>::max() >> 1) ? 0 : 1;
+			Error += A.z < (std::numeric_limits<glm::u8>::max() >> 2) ? 0 : 1;
+			Error += A.x == std::numeric_limits<glm::u8>::max() ? 0 : 1;
+		}
+
+		{
+			glm::u16vec4 const A = glm::compScale<glm::u16>(glm::vec4(0.0f, 0.2f, 0.5f, 1.0f));
+
+			Error += A.x == std::numeric_limits<glm::u16>::min() ? 0 : 1;
+			Error += A.y > (std::numeric_limits<glm::u16>::max() >> 1) ? 0 : 1;
+			Error += A.z < (std::numeric_limits<glm::u16>::max() >> 2) ? 0 : 1;
+			Error += A.x == std::numeric_limits<glm::u16>::max() ? 0 : 1;
+		}
+
+		return Error;
+	}
+}// compScale
 
 int main()
 {
 	int Error(0);
 
-	Error += integer_8bit_test::run();
-	Error += integer_16bit_test::run();
+	Error += compNormalize::run();
+	Error += compScale::run();
 
 	return Error;
 }