1 files changed, 59 insertions, 0 deletions
diff --git a/intern/cycles/util/ies.h b/intern/cycles/util/ies.h
new file mode 100644
index 00000000000..7be072dd5f5
--- /dev/null
+++ b/intern/cycles/util/ies.h
@@ -0,0 +1,59 @@
+/*
+ * 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/string.h"
+#include "util/vector.h"
+
+CCL_NAMESPACE_BEGIN
+
+class IESFile {
+ public:
+  IESFile()
+  {
+  }
+  ~IESFile();
+
+  int packed_size();
+  void pack(float *data);
+
+  bool load(const string &ies);
+  void clear();
+
+ protected:
+  bool parse(const string &ies);
+  bool process();
+  bool process_type_b();
+  bool process_type_c();
+
+  /* The brightness distribution is stored in spherical coordinates.
+   * The horizontal angles correspond 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__ */