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lib/glm/gtx/scalar_multiplication.hpp

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+/// @ref gtx
+/// @file glm/gtx/scalar_multiplication.hpp
+/// @author Joshua Moerman
+///
+/// @brief Enables scalar multiplication for all types
+///
+/// Since GLSL is very strict about types, the following (often used) combinations do not work:
+///    double * vec4
+///    int * vec4
+///    vec4 / int
+/// So we'll fix that! Of course "float * vec4" should remain the same (hence the enable_if magic)
+
+#pragma once
+
+#include "../detail/setup.hpp"
+
+#if !GLM_HAS_TEMPLATE_ALIASES && !(GLM_COMPILER & GLM_COMPILER_GCC)
+#	error "GLM_GTX_scalar_multiplication requires C++11 support or alias templates and if not support for GCC"
+#endif
+
+#include "../vec2.hpp"
+#include "../vec3.hpp"
+#include "../vec4.hpp"
+#include "../mat2x2.hpp"
+#include <type_traits>
+
+namespace glm
+{
+	template <typename T, typename Vec>
+	using return_type_scalar_multiplication = typename std::enable_if<
+		!std::is_same<T, float>::value       // T may not be a float
+		&& std::is_arithmetic<T>::value, Vec // But it may be an int or double (no vec3 or mat3, ...)
+	>::type;
+
+#define GLM_IMPLEMENT_SCAL_MULT(Vec) \
+	template <typename T> \
+	return_type_scalar_multiplication<T, Vec> \
+	operator*(T const & s, Vec rh){ \
+		return rh *= static_cast<float>(s); \
+	} \
+	 \
+	template <typename T> \
+	return_type_scalar_multiplication<T, Vec> \
+	operator*(Vec lh, T const & s){ \
+		return lh *= static_cast<float>(s); \
+	} \
+	 \
+	template <typename T> \
+	return_type_scalar_multiplication<T, Vec> \
+	operator/(Vec lh, T const & s){ \
+		return lh *= 1.0f / s; \
+	}
+
+GLM_IMPLEMENT_SCAL_MULT(vec2)
+GLM_IMPLEMENT_SCAL_MULT(vec3)
+GLM_IMPLEMENT_SCAL_MULT(vec4)
+
+GLM_IMPLEMENT_SCAL_MULT(mat2)
+GLM_IMPLEMENT_SCAL_MULT(mat2x3)
+GLM_IMPLEMENT_SCAL_MULT(mat2x4)
+GLM_IMPLEMENT_SCAL_MULT(mat3x2)
+GLM_IMPLEMENT_SCAL_MULT(mat3)
+GLM_IMPLEMENT_SCAL_MULT(mat3x4)
+GLM_IMPLEMENT_SCAL_MULT(mat4x2)
+GLM_IMPLEMENT_SCAL_MULT(mat4x3)
+GLM_IMPLEMENT_SCAL_MULT(mat4)
+
+#undef GLM_IMPLEMENT_SCAL_MULT
+} // namespace glm