1 files changed, 33 insertions, 0 deletions
diff --git a/glm/gtc/integer.inl b/glm/gtc/integer.inl
new file mode 100644
index 0000000..5f66dfe
--- /dev/null
+++ b/glm/gtc/integer.inl
@@ -0,0 +1,33 @@
+/// @ref gtc_integer
+
+namespace glm{
+namespace detail
+{
+	template<length_t L, typename T, qualifier Q, bool Aligned>
+	struct compute_log2<L, T, Q, false, Aligned>
+	{
+		GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v)
+		{
+			//Equivalent to return findMSB(vec); but save one function call in ASM with VC
+			//return findMSB(vec);
+			return vec<L, T, Q>(detail::compute_findMSB_vec<L, T, Q, sizeof(T) * 8>::call(v));
+		}
+	};
+
+#	if GLM_HAS_BITSCAN_WINDOWS
+		template<qualifier Q, bool Aligned>
+		struct compute_log2<4, int, Q, false, Aligned>
+		{
+			GLM_FUNC_QUALIFIER static vec<4, int, Q> call(vec<4, int, Q> const& v)
+			{
+				vec<4, int, Q> Result;
+				_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.x), v.x);
+				_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.y), v.y);
+				_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.z), v.z);
+				_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.w), v.w);
+				return Result;
+			}
+		};
+#	endif//GLM_HAS_BITSCAN_WINDOWS
+}//namespace detail
+}//namespace glm