diff --git a/renderdoc/common/common.h b/renderdoc/common/common.h
index 6951f95cf..ac9dfa531 100644
--- a/renderdoc/common/common.h
+++ b/renderdoc/common/common.h
@@ -121,6 +121,12 @@ T RDCMAX(const T &a, const T &b)
   return a > b ? a : b;
 }
 
+template <typename T>
+T RDCLERP(const T &a, const T &b, const T &step)
+{
+  return (1.0f - step) * a + step * b;
+}
+
 template <typename T>
 inline T AlignUp4(T x)
 {