1 files changed, 50 insertions, 0 deletions
diff --git a/src/include/glm/detail/compute_common.hpp b/src/include/glm/detail/compute_common.hpp
new file mode 100644
index 0000000..6bcdd6e
--- /dev/null
+++ b/src/include/glm/detail/compute_common.hpp
@@ -0,0 +1,50 @@
+#pragma once
+
+#include "setup.hpp"
+#include <limits>
+
+namespace glm{
+namespace detail
+{
+	template<typename genFIType, bool /*signed*/>
+	struct compute_abs
+	{};
+
+	template<typename genFIType>
+	struct compute_abs<genFIType, true>
+	{
+		GLM_FUNC_QUALIFIER GLM_CONSTEXPR static genFIType call(genFIType x)
+		{
+			GLM_STATIC_ASSERT(
+				std::numeric_limits<genFIType>::is_iec559 || std::numeric_limits<genFIType>::is_signed,
+				"'abs' only accept floating-point and integer scalar or vector inputs");
+
+			return x >= genFIType(0) ? x : -x;
+			// TODO, perf comp with: *(((int *) &x) + 1) &= 0x7fffffff;
+		}
+	};
+
+#if GLM_COMPILER & GLM_COMPILER_CUDA
+	template<>
+	struct compute_abs<float, true>
+	{
+		GLM_FUNC_QUALIFIER GLM_CONSTEXPR static float call(float x)
+		{
+			return fabsf(x);
+		}
+	};
+#endif
+
+	template<typename genFIType>
+	struct compute_abs<genFIType, false>
+	{
+		GLM_FUNC_QUALIFIER GLM_CONSTEXPR static genFIType call(genFIType x)
+		{
+			GLM_STATIC_ASSERT(
+				(!std::numeric_limits<genFIType>::is_signed && std::numeric_limits<genFIType>::is_integer),
+				"'abs' only accept floating-point and integer scalar or vector inputs");
+			return x;
+		}
+	};
+}//namespace detail
+}//namespace glm