text: /*
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   *
   * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
   * All rights reserved.
   */
  
  #ifndef __BKE_CAMERA_H__
  #define __BKE_CAMERA_H__
  
  /** \file
   * \ingroup bke
   * \brief Camera datablock and utility functions.
   */
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  struct Camera;
  struct Depsgraph;
  struct Main;
  struct Object;
  struct RegionView3D;
  struct RenderData;
  struct Scene;
  struct View3D;
  struct rctf;
  
  /* Camera Datablock */
  
  void BKE_camera_init(struct Camera *cam);
  void *BKE_camera_add(struct Main *bmain, const char *name);
  void BKE_camera_copy_data(struct Main *bmain,
                            struct Camera *cam_dst,
                            const struct Camera *cam_src,
                            const int flag);
  struct Camera *BKE_camera_copy(struct Main *bmain, const struct Camera *cam);
  void BKE_camera_make_local(struct Main *bmain, struct Camera *cam, const bool lib_local);
  void BKE_camera_free(struct Camera *ca);
  
  /* Camera Usage */
  
  float BKE_camera_object_dof_distance(struct Object *ob);
  
  int BKE_camera_sensor_fit(int sensor_fit, float sizex, float sizey);
  float BKE_camera_sensor_size(int sensor_fit, float sensor_x, float sensor_y);
  
  /* Camera Parameters:
   *
   * Intermediate struct for storing camera parameters from various sources,
   * to unify computation of viewplane, window matrix, ... */
  
  typedef struct CameraParams {
    /* lens */
    bool is_ortho;
    float lens;
    float ortho_scale;
    float zoom;
  
    float shiftx;
    float shifty;
    float offsetx;
    float offsety;
  
    /* sensor */
    float sensor_x;
    float sensor_y;
    int sensor_fit;
  
    /* clipping */
    float clip_start;
    float clip_end;
  
    /* computed viewplane */
    float ycor;
    float viewdx;
    float viewdy;
    rctf viewplane;
  
    /* computed matrix */
    float winmat[4][4];
  } CameraParams;
  
  /* values for CameraParams.zoom, need to be taken into account for some operations */
  #define CAMERA_PARAM_ZOOM_INIT_CAMOB 1.0f
  #define CAMERA_PARAM_ZOOM_INIT_PERSP 2.0f
  
  void BKE_camera_params_init(CameraParams *params);
  void BKE_camera_params_from_object(CameraParams *params, const struct Object *camera);
  void BKE_camera_params_from_view3d(CameraParams *params,
                                     struct Depsgraph *depsgraph,
                                     const struct View3D *v3d,
                                     const struct RegionView3D *rv3d);
  
  void BKE_camera_params_compute_viewplane(
      CameraParams *params, int winx, int winy, float aspx, float aspy);
  void BKE_camera_params_compute_matrix(CameraParams *params);
  
  /* Camera View Frame */
  
  void BKE_camera_view_frame_ex(const struct Scene *scene,
                                const struct Camera *camera,
                                const float drawsize,
                                const bool do_clip,
                                const float scale[3],
                                float r_asp[2],
                                float r_shift[2],
                                float *r_drawsize,
                                float r_vec[4][3]);
  void BKE_camera_view_frame(const struct Scene *scene,
                             const struct Camera *camera,
                             float r_vec[4][3]);
  
  bool BKE_camera_view_frame_fit_to_scene(struct Depsgraph *depsgraph,
                                          struct Scene *scene,
                                          struct Object *camera_ob,
                                          float r_co[3],
                                          float *r_scale);
  bool BKE_camera_view_frame_fit_to_coords(const struct Depsgraph *depsgraph,
                                           const float (*cos)[3],
                                           int num_cos,
                                           struct Object *camera_ob,
                                           float r_co[3],
                                           float *r_scale);
  
  /* Camera multi-view API */
  
  struct Object *BKE_camera_multiview_render(struct Scene *scene,
                                             struct Object *camera,
                                             const char *viewname);
  void BKE_camera_multiview_view_matrix(struct RenderData *rd,
                                        const struct Object *camera,
                                        const bool is_left,
                                        float r_viewmat[4][4]);
  void BKE_camera_multiview_model_matrix(struct RenderData *rd,
                                         const struct Object *camera,
                                         const char *viewname,
                                         float r_modelmat[4][4]);
  void BKE_camera_multiview_model_matrix_scaled(struct RenderData *rd,
                                                const struct Object *camera,
                                                const char *viewname,
                                                float r_modelmat[4][4]);
  void BKE_camera_multiview_window_matrix(struct RenderData *rd,
                                          const struct Object *camera,
                                          const char *viewname,
                                          float r_winmat[4][4]);
  float BKE_camera_multiview_shift_x(struct RenderData *rd,
                                     const struct Object *camera,
                                     const char *viewname);
  void BKE_camera_multiview_params(struct RenderData *rd,
                                   struct CameraParams *params,
                                   const struct Object *camera,
                                   const char *viewname);
  bool BKE_camera_multiview_spherical_stereo(struct RenderData *rd, const struct Object *camera);
  
  /* Camera background image API */
  struct CameraBGImage *BKE_camera_background_image_new(struct Camera *cam);
  void BKE_camera_background_image_remove(struct Camera *cam, struct CameraBGImage *bgpic);
  void BKE_camera_background_image_clear(struct Camera *cam);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif
  