1 files changed, 15 insertions, 0 deletions
diff --git a/intern/cycles/kernel/util/color.h b/intern/cycles/kernel/util/color.h
index c85ef262d88..4983b9048d4 100644
--- a/intern/cycles/kernel/util/color.h
+++ b/intern/cycles/kernel/util/color.h
@@ -33,4 +33,19 @@ ccl_device float linear_rgb_to_gray(KernelGlobals kg, float3 c)
   return dot(c, float4_to_float3(kernel_data.film.rgb_to_y));
 }
 
+ccl_device_inline Spectrum rgb_to_spectrum(float3 rgb)
+{
+  return rgb;
+}
+
+ccl_device_inline float3 spectrum_to_rgb(Spectrum s)
+{
+  return s;
+}
+
+ccl_device float spectrum_to_gray(KernelGlobals kg, Spectrum c)
+{
+  return linear_rgb_to_gray(kg, spectrum_to_rgb(c));
+}
+
 CCL_NAMESPACE_END