1 files changed, 61 insertions, 0 deletions
diff --git a/intern/cycles/util/util_ies.h b/intern/cycles/util/util_ies.h
new file mode 100644
index 00000000000..5933cb3962a
--- /dev/null
+++ b/intern/cycles/util/util_ies.h
@@ -0,0 +1,61 @@
+/*
+ * 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.
+ */
+
+#ifndef __UTIL_IES_H__
+#define __UTIL_IES_H__
+
+#include "util/util_param.h"
+#include "util/util_vector.h"
+
+CCL_NAMESPACE_BEGIN
+
+class IESFile {
+public:
+	IESFile() {}
+	~IESFile();
+
+	int packed_size();
+	void pack(float *data);
+
+	bool load(ustring ies);
+	void clear();
+
+protected:
+	bool parse(ustring ies);
+	bool process();
+	bool process_type_b();
+	bool process_type_c();
+
+	/* The brightness distribution is stored in spherical coordinates.
+	 * The horizontal angles correspond to to theta in the regular notation
+	 * and always span the full range from 0° to 360°.
+	 * The vertical angles correspond to phi and always start at 0°. */
+	vector<float> v_angles, h_angles;
+	/* The actual values are stored here, with every entry storing the values
+	 * of one horizontal segment. */
+	vector<vector<float> > intensity;
+
+	/* Types of angle representation in IES files. Currently, only B and C are supported. */
+	enum IESType {
+		TYPE_A = 3,
+		TYPE_B = 2,
+		TYPE_C = 1
+	} type;
+};
+
+CCL_NAMESPACE_END
+
+#endif /* __UTIL_IES_H__ */