1 files changed, 35 insertions, 0 deletions
diff --git a/intern/cycles/kernel/util/color.h b/intern/cycles/kernel/util/color.h
new file mode 100644
index 00000000000..6d17647c9f8
--- /dev/null
+++ b/intern/cycles/kernel/util/color.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2011-2018 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "util/color.h"
+
+CCL_NAMESPACE_BEGIN
+
+ccl_device float3 xyz_to_rgb(KernelGlobals kg, float3 xyz)
+{
+  return make_float3(dot(float4_to_float3(kernel_data.film.xyz_to_r), xyz),
+                     dot(float4_to_float3(kernel_data.film.xyz_to_g), xyz),
+                     dot(float4_to_float3(kernel_data.film.xyz_to_b), xyz));
+}
+
+ccl_device float linear_rgb_to_gray(KernelGlobals kg, float3 c)
+{
+  return dot(c, float4_to_float3(kernel_data.film.rgb_to_y));
+}
+
+CCL_NAMESPACE_END