util/ies.h

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/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
 *
 * SPDX-License-Identifier: Apache-2.0 */
 
#pragma once
 
#include "util/string.h"
#include "util/vector.h"
 
CCL_NAMESPACE_BEGIN
 
class IESFile {
 public:
  IESFile() = default;
  ~IESFile();
 
  int packed_size();
  void pack(float *data);
 
  bool load(const string &ies);
  void clear();
 
 protected:
  bool parse(const string &ies);
  bool process();
  void process_type_a();
  void process_type_b();
  void 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. */
  enum IESType { TYPE_A = 3, TYPE_B = 2, TYPE_C = 1 } type;
};
 
CCL_NAMESPACE_END