1 files changed, 14 insertions, 0 deletions
diff --git a/intern/cycles/util/util_color.h b/intern/cycles/util/util_color.h
index 83410db13c6..6e61190de6b 100644
--- a/intern/cycles/util/util_color.h
+++ b/intern/cycles/util/util_color.h
@@ -257,6 +257,20 @@ ccl_device float4 color_srgb_to_linear_v4(float4 c)
 #endif
 }
 
+ccl_device float3 color_highlight_compress(float3 color, float3 *variance)
+{
+  color += make_float3(1.0f, 1.0f, 1.0f);
+  if (variance) {
+    *variance *= sqr3(make_float3(1.0f, 1.0f, 1.0f) / color);
+  }
+  return log3(color);
+}
+
+ccl_device float3 color_highlight_uncompress(float3 color)
+{
+  return exp3(color) - make_float3(1.0f, 1.0f, 1.0f);
+}
+
 CCL_NAMESPACE_END
 
 #endif /* __UTIL_COLOR_H__ */