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.
   */
  
  /** \file
   * \ingroup spview3d
   */
  
  #include "BLI_math.h"
  #include "BLI_utildefines.h"
  
  #include "BKE_context.h"
  #include "BKE_object.h"
  
  #include "DEG_depsgraph.h"
  
  #include "DNA_object_types.h"
  #include "DNA_light_types.h"
  
  #include "ED_screen.h"
  #include "ED_gizmo_library.h"
  
  #include "UI_resources.h"
  
  #include "MEM_guardedalloc.h"
  
  #include "RNA_access.h"
  
  #include "WM_api.h"
  #include "WM_types.h"
  
  #include "view3d_intern.h" /* own include */
  
  /* -------------------------------------------------------------------- */
  /** \name Spot Light Gizmos
   * \{ */
  
  static bool WIDGETGROUP_light_spot_poll(const bContext *C, wmGizmoGroupType *UNUSED(gzgt))
  {
    View3D *v3d = CTX_wm_view3d(C);
    if (v3d->gizmo_flag & (V3D_GIZMO_HIDE | V3D_GIZMO_HIDE_CONTEXT)) {
      return false;
    }
    if ((v3d->gizmo_show_light & V3D_GIZMO_SHOW_LIGHT_SIZE) == 0) {
      return false;
    }
  
    ViewLayer *view_layer = CTX_data_view_layer(C);
    Base *base = BASACT(view_layer);
    if (base && BASE_SELECTABLE(v3d, base)) {
      Object *ob = base->object;
      if (ob->type == OB_LAMP) {
        Light *la = ob->data;
        return (la->type == LA_SPOT);
      }
    }
    return false;
  }
  
  static void WIDGETGROUP_light_spot_setup(const bContext *UNUSED(C), wmGizmoGroup *gzgroup)
  {
    wmGizmoWrapper *wwrapper = MEM_mallocN(sizeof(wmGizmoWrapper), __func__);
  
    wwrapper->gizmo = WM_gizmo_new("GIZMO_GT_arrow_3d", gzgroup, NULL);
    wmGizmo *gz = wwrapper->gizmo;
    RNA_enum_set(gz->ptr, "transform", ED_GIZMO_ARROW_XFORM_FLAG_INVERTED);
  
    gzgroup->customdata = wwrapper;
  
    ED_gizmo_arrow3d_set_range_fac(gz, 4.0f);
  
    UI_GetThemeColor3fv(TH_GIZMO_SECONDARY, gz->color);
  }
  
  static void WIDGETGROUP_light_spot_refresh(const bContext *C, wmGizmoGroup *gzgroup)
  {
    wmGizmoWrapper *wwrapper = gzgroup->customdata;
    wmGizmo *gz = wwrapper->gizmo;
    ViewLayer *view_layer = CTX_data_view_layer(C);
    Object *ob = OBACT(view_layer);
    Light *la = ob->data;
    float dir[3];
  
    negate_v3_v3(dir, ob->obmat[2]);
  
    WM_gizmo_set_matrix_rotation_from_z_axis(gz, dir);
    WM_gizmo_set_matrix_location(gz, ob->obmat[3]);
  
    /* need to set property here for undo. TODO would prefer to do this in _init */
    PointerRNA lamp_ptr;
    const char *propname = "spot_size";
    RNA_pointer_create(&la->id, &RNA_Light, la, &lamp_ptr);
    WM_gizmo_target_property_def_rna(gz, "offset", &lamp_ptr, propname, -1);
  }
  
  void VIEW3D_GGT_light_spot(wmGizmoGroupType *gzgt)
  {
    gzgt->name = "Spot Light Widgets";
    gzgt->idname = "VIEW3D_GGT_light_spot";
  
    gzgt->flag |= (WM_GIZMOGROUPTYPE_PERSISTENT | WM_GIZMOGROUPTYPE_3D | WM_GIZMOGROUPTYPE_DEPTH_3D);
  
    gzgt->poll = WIDGETGROUP_light_spot_poll;
    gzgt->setup = WIDGETGROUP_light_spot_setup;
    gzgt->setup_keymap = WM_gizmogroup_setup_keymap_generic_maybe_drag;
    gzgt->refresh = WIDGETGROUP_light_spot_refresh;
  }
  
  /** \} */
  
  /* -------------------------------------------------------------------- */
  /** \name Area Light Gizmos
   * \{ */
  
  /* scale callbacks */
  static void gizmo_area_light_prop_matrix_get(const wmGizmo *UNUSED(gz),
                                               wmGizmoProperty *gz_prop,
                                               void *value_p)
  {
    BLI_assert(gz_prop->type->array_length == 16);
    float(*matrix)[4] = value_p;
    const Light *la = gz_prop->custom_func.user_data;
  
    matrix[0][0] = la->area_size;
    matrix[1][1] = ELEM(la->area_shape, LA_AREA_RECT, LA_AREA_ELLIPSE) ? la->area_sizey :
                                                                         la->area_size;
  }
  
  static void gizmo_area_light_prop_matrix_set(const wmGizmo *UNUSED(gz),
                                               wmGizmoProperty *gz_prop,
                                               const void *value_p)
  {
    const float(*matrix)[4] = value_p;
    BLI_assert(gz_prop->type->array_length == 16);
    Light *la = gz_prop->custom_func.user_data;
  
    if (ELEM(la->area_shape, LA_AREA_RECT, LA_AREA_ELLIPSE)) {
      la->area_size = len_v3(matrix[0]);
      la->area_sizey = len_v3(matrix[1]);
    }
    else {
      la->area_size = len_v3(matrix[0]);
    }
  
    DEG_id_tag_update(&la->id, ID_RECALC_COPY_ON_WRITE);
    WM_main_add_notifier(NC_LAMP | ND_LIGHTING_DRAW, la);
  }
  
  static bool WIDGETGROUP_light_area_poll(const bContext *C, wmGizmoGroupType *UNUSED(gzgt))
  {
    View3D *v3d = CTX_wm_view3d(C);
    if (v3d->gizmo_flag & (V3D_GIZMO_HIDE | V3D_GIZMO_HIDE_CONTEXT)) {
      return false;
    }
    if ((v3d->gizmo_show_light & V3D_GIZMO_SHOW_LIGHT_SIZE) == 0) {
      return false;
    }
  
    ViewLayer *view_layer = CTX_data_view_layer(C);
    Base *base = BASACT(view_layer);
    if (base && BASE_SELECTABLE(v3d, base)) {
      Object *ob = base->object;
      if (ob->type == OB_LAMP) {
        Light *la = ob->data;
        return (la->type == LA_AREA);
      }
    }
    return false;
  }
  
  static void WIDGETGROUP_light_area_setup(const bContext *UNUSED(C), wmGizmoGroup *gzgroup)
  {
    wmGizmoWrapper *wwrapper = MEM_mallocN(sizeof(wmGizmoWrapper), __func__);
    wwrapper->gizmo = WM_gizmo_new("GIZMO_GT_cage_2d", gzgroup, NULL);
    wmGizmo *gz = wwrapper->gizmo;
    RNA_enum_set(gz->ptr, "transform", ED_GIZMO_CAGE2D_XFORM_FLAG_SCALE);
  
    gzgroup->customdata = wwrapper;
  
    WM_gizmo_set_flag(gz, WM_GIZMO_DRAW_HOVER, true);
  
    UI_GetThemeColor3fv(TH_GIZMO_PRIMARY, gz->color);
    UI_GetThemeColor3fv(TH_GIZMO_HI, gz->color_hi);
  }
  
  static void WIDGETGROUP_light_area_refresh(const bContext *C, wmGizmoGroup *gzgroup)
  {
    wmGizmoWrapper *wwrapper = gzgroup->customdata;
    ViewLayer *view_layer = CTX_data_view_layer(C);
    Object *ob = OBACT(view_layer);
    Light *la = ob->data;
    wmGizmo *gz = wwrapper->gizmo;
  
    copy_m4_m4(gz->matrix_basis, ob->obmat);
  
    int flag = ED_GIZMO_CAGE2D_XFORM_FLAG_SCALE;
    if (ELEM(la->area_shape, LA_AREA_SQUARE, LA_AREA_DISK)) {
      flag |= ED_GIZMO_CAGE2D_XFORM_FLAG_SCALE_UNIFORM;
    }
    RNA_enum_set(gz->ptr, "transform", flag);
  
    /* need to set property here for undo. TODO would prefer to do this in _init */
    WM_gizmo_target_property_def_func(gz,
                                      "matrix",
                                      &(const struct wmGizmoPropertyFnParams){
                                          .value_get_fn = gizmo_area_light_prop_matrix_get,
                                          .value_set_fn = gizmo_area_light_prop_matrix_set,
                                          .range_get_fn = NULL,
                                          .user_data = la,
                                      });
  }
  
  void VIEW3D_GGT_light_area(wmGizmoGroupType *gzgt)
  {
    gzgt->name = "Area Light Widgets";
    gzgt->idname = "VIEW3D_GGT_light_area";
  
    gzgt->flag |= (WM_GIZMOGROUPTYPE_PERSISTENT | WM_GIZMOGROUPTYPE_3D | WM_GIZMOGROUPTYPE_DEPTH_3D);
  
    gzgt->poll = WIDGETGROUP_light_area_poll;
    gzgt->setup = WIDGETGROUP_light_area_setup;
    gzgt->setup_keymap = WM_gizmogroup_setup_keymap_generic_maybe_drag;
    gzgt->refresh = WIDGETGROUP_light_area_refresh;
  }
  
  /** \} */
  
  /* -------------------------------------------------------------------- */
  /** \name Light Target Gizmo
   * \{ */
  
  static bool WIDGETGROUP_light_target_poll(const bContext *C, wmGizmoGroupType *UNUSED(gzgt))
  {
    View3D *v3d = CTX_wm_view3d(C);
    if (v3d->gizmo_flag & (V3D_GIZMO_HIDE | V3D_GIZMO_HIDE_CONTEXT)) {
      return false;
    }
    if ((v3d->gizmo_show_light & V3D_GIZMO_SHOW_LIGHT_LOOK_AT) == 0) {
      return false;
    }
  
    ViewLayer *view_layer = CTX_data_view_layer(C);
    Base *base = BASACT(view_layer);
    if (base && BASE_SELECTABLE(v3d, base)) {
      Object *ob = base->object;
      if (ob->type == OB_LAMP) {
        Light *la = ob->data;
        return (ELEM(la->type, LA_SUN, LA_SPOT, LA_AREA));
      }
  #if 0
      else if (ob->type == OB_CAMERA) {
        return true;
      }
  #endif
    }
    return false;
  }
  
  static void WIDGETGROUP_light_target_setup(const bContext *UNUSED(C), wmGizmoGroup *gzgroup)
  {
    wmGizmoWrapper *wwrapper = MEM_mallocN(sizeof(wmGizmoWrapper), __func__);
    wwrapper->gizmo = WM_gizmo_new("GIZMO_GT_move_3d", gzgroup, NULL);
    wmGizmo *gz = wwrapper->gizmo;
  
    gzgroup->customdata = wwrapper;
  
    UI_GetThemeColor3fv(TH_GIZMO_PRIMARY, gz->color);
    UI_GetThemeColor3fv(TH_GIZMO_HI, gz->color_hi);
  
    gz->scale_basis = 0.06f;
  
    wmOperatorType *ot = WM_operatortype_find("OBJECT_OT_transform_axis_target", true);
  
    RNA_enum_set(
        gz->ptr, "draw_options", ED_GIZMO_MOVE_DRAW_FLAG_FILL | ED_GIZMO_MOVE_DRAW_FLAG_ALIGN_VIEW);
  
    WM_gizmo_operator_set(gz, 0, ot, NULL);
  }
  
  static void WIDGETGROUP_light_target_draw_prepare(const bContext *C, wmGizmoGroup *gzgroup)
  {
    wmGizmoWrapper *wwrapper = gzgroup->customdata;
    ViewLayer *view_layer = CTX_data_view_layer(C);
    Object *ob = OBACT(view_layer);
    wmGizmo *gz = wwrapper->gizmo;
  
    normalize_m4_m4(gz->matrix_basis, ob->obmat);
    unit_m4(gz->matrix_offset);
  
    if (ob->type == OB_LAMP) {
      Light *la = ob->data;
      if (la->type == LA_SPOT) {
        /* Draw just past the light size angle gizmo. */
        madd_v3_v3fl(gz->matrix_basis[3], gz->matrix_basis[2], -la->spotsize);
      }
    }
    gz->matrix_offset[3][2] -= 23.0;
    WM_gizmo_set_flag(gz, WM_GIZMO_DRAW_OFFSET_SCALE, true);
  }
  
  void VIEW3D_GGT_light_target(wmGizmoGroupType *gzgt)
  {
    gzgt->name = "Target Light Widgets";
    gzgt->idname = "VIEW3D_GGT_light_target";
  
    gzgt->flag |= (WM_GIZMOGROUPTYPE_PERSISTENT | WM_GIZMOGROUPTYPE_3D);
  
    gzgt->poll = WIDGETGROUP_light_target_poll;
    gzgt->setup = WIDGETGROUP_light_target_setup;
    gzgt->setup_keymap = WM_gizmogroup_setup_keymap_generic_maybe_drag;
    gzgt->draw_prepare = WIDGETGROUP_light_target_draw_prepare;
  }
  
  /** \} */
  