/* Lighting Effects 0.2.2 -- image filter plug-in for PIKA
 *
 * Copyright (C) 1996-98 Tom Bech
 * Copyright (C) 1996-98 Federico Mena Quintero
 *
 * E-mail: tomb@gimp.org (Tom) or quartic@gimp.org (Federico)
 *
 * 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 3 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, see <https://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <gtk/gtk.h>

#include <libpika/pika.h>

#include "lighting-apply.h"
#include "lighting-image.h"
#include "lighting-main.h"
#include "lighting-preview.h"
#include "lighting-shade.h"
#include "lighting-ui.h"

#include "libpika/stdplugins-intl.h"


LightingValues mapvals;


typedef struct _Lighting      Lighting;
typedef struct _LightingClass LightingClass;

struct _Lighting
{
  PikaPlugIn parent_instance;
};

struct _LightingClass
{
  PikaPlugInClass parent_class;
};


#define LIGHTING_TYPE  (lighting_get_type ())
#define LIGHTING(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), LIGHTING_TYPE, Lighting))

GType                   lighting_get_type         (void) G_GNUC_CONST;

static GList          * lighting_query_procedures (PikaPlugIn           *plug_in);
static PikaProcedure  * lighting_create_procedure (PikaPlugIn           *plug_in,
                                                   const gchar          *name);

static PikaValueArray * lighting_run              (PikaProcedure        *procedure,
                                                   PikaRunMode           run_mode,
                                                   PikaImage            *image,
                                                   gint                  n_drawables,
                                                   PikaDrawable        **drawables,
                                                   PikaProcedureConfig  *config,
                                                   gpointer              run_data);

static void             set_default_settings      (void);
static void             check_drawables           (void);


G_DEFINE_TYPE (Lighting, lighting, PIKA_TYPE_PLUG_IN)

PIKA_MAIN (LIGHTING_TYPE)
DEFINE_STD_SET_I18N


static void
lighting_class_init (LightingClass *klass)
{
  PikaPlugInClass *plug_in_class = PIKA_PLUG_IN_CLASS (klass);

  plug_in_class->query_procedures = lighting_query_procedures;
  plug_in_class->create_procedure = lighting_create_procedure;
  plug_in_class->set_i18n         = STD_SET_I18N;
}

static void
lighting_init (Lighting *lighting)
{
}

static GList *
lighting_query_procedures (PikaPlugIn *plug_in)
{
  return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
}

static PikaProcedure *
lighting_create_procedure (PikaPlugIn  *plug_in,
                       const gchar *name)
{
  PikaProcedure *procedure = NULL;

  if (! strcmp (name, PLUG_IN_PROC))
    {
      PikaRGB white = { 1.0, 1.0, 1.0, 1.0 };

      procedure = pika_image_procedure_new (plug_in, name,
                                            PIKA_PDB_PROC_TYPE_PLUGIN,
                                            lighting_run, NULL, NULL);

      pika_procedure_set_image_types (procedure, "RGB*");
      pika_procedure_set_sensitivity_mask (procedure,
                                           PIKA_PROCEDURE_SENSITIVE_DRAWABLE);

      pika_procedure_set_menu_label (procedure, _("_Lighting Effects..."));
      pika_procedure_add_menu_path (procedure,
                                    "<Image>/Filters/Light and Shadow/[Light]");

      pika_procedure_set_documentation (procedure,
                                        _("Apply various lighting effects "
                                          "to an image"),
                                        "No help yet",
                                        name);
      pika_procedure_set_attribution (procedure,
                                      "Tom Bech & Federico Mena Quintero",
                                      "Tom Bech & Federico Mena Quintero",
                                      "Version 0.2.0, March 15 1998");

      PIKA_PROC_ARG_DRAWABLE (procedure, "bump-drawable",
                              _("B_ump map image"),
                              _("Bumpmap drawable (set to NULL if disabled)"),
                              TRUE,
                              G_PARAM_READWRITE);

      PIKA_PROC_ARG_DRAWABLE (procedure, "env-drawable",
                              _("Enviro_nment map image"),
                              _("Environmentmap drawable "
                                "(set to NULL if disabled)"),
                              TRUE,
                              G_PARAM_READWRITE);

      PIKA_PROC_ARG_BOOLEAN (procedure, "do-bumpmap",
                             _("Enable bump mappi_ng"),
                             _("Enable bumpmapping"),
                             TRUE,
                             G_PARAM_READWRITE);

      PIKA_PROC_ARG_BOOLEAN (procedure, "do-envmap",
                             _("Enable en_vironment mapping"),
                             _("Enable envmapping"),
                             TRUE,
                             G_PARAM_READWRITE);

      PIKA_PROC_ARG_CHOICE (procedure, "bumpmap-type",
                            _("Cur_ve"),
                            _("Type of mapping"),
                            pika_choice_new_with_values ("bumpmap-linear",     LINEAR_MAP,      _("Linear"),      NULL,
                                                         "bumpmap-log",        LOGARITHMIC_MAP, _("Logarithmic"), NULL,
                                                         "bumpmap-sinusoidal", SINUSOIDAL_MAP,  _("Sinusoidal"),  NULL,
                                                         "bumpmap-spherical",  SPHERICAL_MAP,   _("Spherical"),   NULL,
                                                         NULL),
                            "bumpmap-linear",
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "bumpmap-max-height",
                            _("Ma_ximum height"),
                            _("The maximum height of the bumpmap"),
                            0.0, G_MAXFLOAT, 0.1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_CHOICE (procedure, "which-light",
                                _("Active"),
                                _("Which light is active in the GUI"),
                                pika_choice_new_with_values ("light-1", 0, _("Light 1"), NULL,
                                                             "light-2", 1, _("Light 2"), NULL,
                                                             "light-3", 2, _("Light 3"), NULL,
                                                             "light-4", 3, _("Light 4"), NULL,
                                                             "light-5", 4, _("Light 5"), NULL,
                                                             "light-6", 5, _("Light 6"), NULL,
                                                             NULL),
                                "light-1",
                                G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_BOOLEAN (procedure, "isolate",
                                 _("Isolate"),
                                 _("Only show the active lighting in "
                                   "the preview"),
                                 FALSE,
                                 G_PARAM_READWRITE);

      PIKA_PROC_ARG_CHOICE (procedure, "light-type-1",
                            _("Type"),
                            _("Type of light source"),
                            pika_choice_new_with_values ("light-none",        NO_LIGHT,          _("None"),        NULL,
                                                         "light-directional", DIRECTIONAL_LIGHT, _("Directional"), NULL,
                                                         "light-point",       POINT_LIGHT,       _("Point"),       NULL,
                                                         "light-spot",        SPOT_LIGHT,        _("Spot"),        NULL,
                                                         NULL),
                            "light-point",
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_RGB (procedure, "light-color-1",
                         _("Color"),
                         _("Light source color"),
                         TRUE, &white,
                         G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "light-intensity-1",
                            _("Intensity"),
                            _("Light source intensity"),
                            0, 100.0, 1.0,
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "light-position-x-1",
                            _("Light position X"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, -1,
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "light-position-y-1",
                            _("Light position Y"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, -1,
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "light-position-z-1",
                            _("Light position Z"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "light-direction-x-1",
                            _("Light direction X"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, -1,
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "light-direction-y-1",
                            _("Light direction Y"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, -1,
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "light-direction-z-1",
                            _("Light direction Z"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "ambient-intensity",
                            _("Ambient intensity"),
                            _("Material ambient intensity "
                              "(Glowing)"),
                            0, 1, 0.2,
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "diffuse-intensity",
                            _("Diffuse intensity"),
                            _("Material diffuse intensity "
                              "(Bright)"),
                            0, 1, 0.5,
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "diffuse-reflectivity",
                            "Diffuse reflectivity",
                            "Material diffuse reflectivity",
                            0, 1, 0.4,
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "specular-reflectivity",
                            "Specular reflectivity",
                            "Material specular reflectivity",
                            0, 1, 0.5,
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "highlight",
                            "Highlight",
                            "Material highlight (note, it's exponential) "
                            "(Polished)",
                            0, G_MAXDOUBLE, 27.0,
                            G_PARAM_READWRITE);

      PIKA_PROC_ARG_BOOLEAN (procedure, "metallic",
                             _("Metallic"),
                             _("Enable envmapping"),
                             FALSE,
                             G_PARAM_READWRITE);

      PIKA_PROC_ARG_BOOLEAN (procedure, "antialiasing",
                             _("_Antialiasing"),
                             _("Apply antialiasing"),
                             FALSE,
                             G_PARAM_READWRITE);

      PIKA_PROC_ARG_BOOLEAN (procedure, "new-image",
                             _("Create new ima_ge"),
                             _("Create a new image"),
                             FALSE,
                             G_PARAM_READWRITE);

      PIKA_PROC_ARG_BOOLEAN (procedure, "transparent-background",
                             _("Trans_parent background"),
                             _("Make background transparent"),
                             FALSE,
                             G_PARAM_READWRITE);

      PIKA_PROC_ARG_DOUBLE (procedure, "distance",
                            _("_Distance"),
                            _("Distance of observer from surface"),
                            0, 2.0, 0.25,
                            G_PARAM_READWRITE);

      /* GUI-only arguments for additional light sources */
      PIKA_PROC_AUX_ARG_CHOICE (procedure, "light-type-2",
                            _("Type"),
                            _("Type of light source"),
                            pika_choice_new_with_values ("light-none",        NO_LIGHT,          _("None"),        NULL,
                                                         "light-directional", DIRECTIONAL_LIGHT, _("Directional"), NULL,
                                                         "light-point",       POINT_LIGHT,       _("Point"),       NULL,
                                                         "light-spot",        SPOT_LIGHT,        _("Spot"),        NULL,
                                                         NULL),
                            "light-point",
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_RGB (procedure, "light-color-2",
                         _("Color"),
                         _("Light source color"),
                         TRUE, &white,
                         G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-intensity-2",
                            _("Intensity"),
                            _("Light source intensity"),
                            0, 100.0, 1.0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-x-2",
                            _("Light position X"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, -2,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-y-2",
                            _("Light position Y"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, -1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-z-2",
                            _("Light position Z"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-x-2",
                            _("Light direction X"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-y-2",
                            _("Light direction Y"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, -1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-z-2",
                            _("Light direction Z"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_CHOICE (procedure, "light-type-3",
                            _("Type"),
                            _("Type of light source"),
                            pika_choice_new_with_values ("light-none",        NO_LIGHT,          _("None"),        NULL,
                                                         "light-directional", DIRECTIONAL_LIGHT, _("Directional"), NULL,
                                                         "light-point",       POINT_LIGHT,       _("Point"),       NULL,
                                                         "light-spot",        SPOT_LIGHT,        _("Spot"),        NULL,
                                                         NULL),
                            "light-point",
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_RGB (procedure, "light-color-3",
                         _("Color"),
                         _("Light source color"),
                         TRUE, &white,
                         G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-intensity-3",
                            _("Intensity"),
                            _("Light source intensity"),
                            0, 100.0, 1.0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-x-3",
                            _("Light position X"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-y-3",
                            _("Light position Y"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 2,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-z-3",
                            _("Light position Z"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-x-3",
                            _("Light direction X"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-y-3",
                            _("Light direction Y"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-z-3",
                            _("Light direction Z"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_CHOICE (procedure, "light-type-4",
                            _("Type"),
                            _("Type of light source"),
                            pika_choice_new_with_values ("light-none",        NO_LIGHT,          _("None"),        NULL,
                                                         "light-directional", DIRECTIONAL_LIGHT, _("Directional"), NULL,
                                                         "light-point",       POINT_LIGHT,       _("Point"),       NULL,
                                                         "light-spot",        SPOT_LIGHT,        _("Spot"),        NULL,
                                                         NULL),
                            "light-point",
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_RGB (procedure, "light-color-4",
                         _("Color"),
                         _("Light source color"),
                         TRUE, &white,
                         G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-intensity-4",
                            _("Intensity"),
                            _("Light source intensity"),
                            0, 100.0, 1.0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-x-4",
                            _("Light position X"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-y-4",
                            _("Light position Y"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-z-4",
                            _("Light position Z"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-x-4",
                            _("Light direction X"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-y-4",
                            _("Light direction Y"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-z-4",
                            _("Light direction Z"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_CHOICE (procedure, "light-type-5",
                            _("Type"),
                            _("Type of light source"),
                            pika_choice_new_with_values ("light-none",        NO_LIGHT,          _("None"),        NULL,
                                                         "light-directional", DIRECTIONAL_LIGHT, _("Directional"), NULL,
                                                         "light-point",       POINT_LIGHT,       _("Point"),       NULL,
                                                         "light-spot",        SPOT_LIGHT,        _("Spot"),        NULL,
                                                         NULL),
                            "light-point",
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_RGB (procedure, "light-color-5",
                         _("Color"),
                         _("Light source color"),
                         TRUE, &white,
                         G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-intensity-5",
                            _("Intensity"),
                            _("Light source intensity"),
                            0, 100.0, 1.0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-x-5",
                            _("Light position X"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-y-5",
                            _("Light position Y"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-z-5",
                            _("Light position Z"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-x-5",
                            _("Light direction X"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-y-5",
                            _("Light direction Y"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-z-5",
                            _("Light direction Z"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_CHOICE (procedure, "light-type-6",
                            _("Type"),
                            _("Type of light source"),
                            pika_choice_new_with_values ("light-none",        NO_LIGHT,          _("None"),        NULL,
                                                         "light-directional", DIRECTIONAL_LIGHT, _("Directional"), NULL,
                                                         "light-point",       POINT_LIGHT,       _("Point"),       NULL,
                                                         "light-spot",        SPOT_LIGHT,        _("Spot"),        NULL,
                                                         NULL),
                            "light-point",
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_RGB (procedure, "light-color-6",
                         _("Color"),
                         _("Light source color"),
                         TRUE, &white,
                         G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-intensity-6",
                            _("Intensity"),
                            _("Light source intensity"),
                            0, 100.0, 1.0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-x-6",
                            _("Light position X"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-y-6",
                            _("Light position Y"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-position-z-6",
                            _("Light position Z"),
                            _("Light source position (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-x-6",
                            _("Light direction X"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-y-6",
                            _("Light direction Y"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                            G_PARAM_READWRITE);

      PIKA_PROC_AUX_ARG_DOUBLE (procedure, "light-direction-z-6",
                            _("Light direction Z"),
                            _("Light source direction (x,y,z)"),
                            -G_MAXDOUBLE, G_MAXDOUBLE, 1,
                            G_PARAM_READWRITE);
    }

  return procedure;
}

static void
set_default_settings (void)
{
  gint k;

  mapvals.update_enabled = TRUE;
  mapvals.light_selected = 0;
  mapvals.light_isolated = FALSE;

  pika_vector3_set (&mapvals.viewpoint,   0.5, 0.5, 0.25);
  pika_vector3_set (&mapvals.planenormal, 0.0, 0.0, 1.0);

  pika_vector3_set (&mapvals.lightsource[0].position,  -1.0, -1.0, 1.0);
  pika_vector3_set (&mapvals.lightsource[0].direction, -1.0, -1.0, 1.0);

  pika_rgba_set (&mapvals.lightsource[0].color, 1.0, 1.0, 1.0, 1.0);
  mapvals.lightsource[0].intensity = 1.0;
  mapvals.lightsource[0].type      = POINT_LIGHT;
  mapvals.lightsource[0].active    = TRUE;

  /* init lights 2 and 3 pos to upper left and below */
  pika_vector3_set (&mapvals.lightsource[1].position,   2.0, -1.0, 1.0);
  pika_vector3_set (&mapvals.lightsource[1].direction,  1.0, -1.0, 1.0);

  pika_vector3_set (&mapvals.lightsource[2].position,   1.0,  2.0, 1.0);
  pika_vector3_set (&mapvals.lightsource[2].direction,  0.0,  1.0, 1.0);

  /* init any remaining lights to directly overhead */
  for (k = 3; k < NUM_LIGHTS; k++)
    {
      pika_vector3_set (&mapvals.lightsource[k].position,   0.0,  0.0, 1.0);
      pika_vector3_set (&mapvals.lightsource[k].direction,  0.0,  0.0, 1.0);
    }

  for (k = 1; k < NUM_LIGHTS; k++)
    {
      pika_rgba_set (&mapvals.lightsource[k].color, 1.0, 1.0, 1.0, 1.0);
      mapvals.lightsource[k].intensity = 1.0;
      mapvals.lightsource[k].type      = NO_LIGHT;
      mapvals.lightsource[k].active    = TRUE;
    }

  mapvals.material.ambient_int  =  0.2;
  mapvals.material.diffuse_int  =  0.5;
  mapvals.material.diffuse_ref  =  0.4;
  mapvals.material.specular_ref =  0.5;
  mapvals.material.highlight    = 27.0;
  mapvals.material.metallic     = FALSE;

  mapvals.pixel_threshold     = 0.25;
  mapvals.max_depth           =  3.0;
  mapvals.preview_zoom_factor =  1.0;

  mapvals.bumpmaptype = 0;
  mapvals.bumpmin     = 0.0;
  mapvals.bumpmax     = 0.1;

  mapvals.antialiasing           = FALSE;
  mapvals.create_new_image       = FALSE;
  mapvals.transparent_background = FALSE;
  mapvals.bump_mapped            = FALSE;
  mapvals.env_mapped             = FALSE;
  mapvals.ref_mapped             = FALSE;
  mapvals.previewquality         = FALSE;
  mapvals.interactive_preview    = TRUE;

  mapvals.bumpmap_id = -1;
  mapvals.envmap_id  = -1;
}

static void
check_drawables (void)
{
  PikaDrawable *drawable;
  PikaDrawable *map;

  if (mapvals.bump_mapped)
    {
      if (! pika_item_id_is_drawable (mapvals.bumpmap_id))
        {
          mapvals.bump_mapped = FALSE;
          mapvals.bumpmap_id  = -1;
        }
      else
        {
          drawable = pika_drawable_get_by_id (mapvals.drawable_id);
          map      = pika_drawable_get_by_id (mapvals.bumpmap_id);

          if (pika_drawable_is_indexed (map) ||
              (pika_drawable_get_width  (drawable) != pika_drawable_get_width  (map)) ||
              (pika_drawable_get_height (drawable) != pika_drawable_get_height (map)))
            {
              mapvals.bump_mapped = FALSE;
              mapvals.bumpmap_id  = -1;
            }
        }
    }

  if (mapvals.env_mapped)
    {
      if (! pika_item_id_is_drawable (mapvals.envmap_id))
        {
          mapvals.env_mapped = FALSE;
          mapvals.envmap_id  = -1;
        }
      else
        {
          map = pika_drawable_get_by_id (mapvals.envmap_id);

          if (pika_drawable_is_gray   (map) ||
              pika_drawable_has_alpha (map))
            {
              mapvals.env_mapped = FALSE;
              mapvals.envmap_id  = -1;
            }
        }
    }
}

static PikaValueArray *
lighting_run (PikaProcedure        *procedure,
              PikaRunMode           run_mode,
              PikaImage            *image,
              gint                  n_drawables,
              PikaDrawable        **drawables,
              PikaProcedureConfig  *config,
              gpointer              run_data)
{
  PikaDrawable *drawable;

  gegl_init (NULL, NULL);

  if (n_drawables != 1)
    {
      GError *error = NULL;

      g_set_error (&error, PIKA_PLUG_IN_ERROR, 0,
                   _("Procedure '%s' only works with one drawable."),
                   pika_procedure_get_name (procedure));

      return pika_procedure_new_return_values (procedure,
                                               PIKA_PDB_CALLING_ERROR,
                                               error);
    }
  else
    {
      drawable = drawables[0];
    }

  set_default_settings ();

  mapvals.drawable_id = pika_item_get_id (PIKA_ITEM (drawable));

  check_drawables ();

  if (pika_drawable_is_rgb (drawable))
    {
      mapvals.config = config;
      copy_from_config (config);

      switch (run_mode)
        {
        case PIKA_RUN_INTERACTIVE:
          if (! main_dialog (procedure, config, drawable))
            {
              return pika_procedure_new_return_values (procedure,
                                                       PIKA_PDB_CANCEL,
                                                       NULL);
            }

          compute_image ();

          pika_displays_flush ();
          break;

        case PIKA_RUN_WITH_LAST_VALS:
          if (image_setup (drawable, FALSE))
            compute_image ();
          pika_displays_flush ();
          break;

        case PIKA_RUN_NONINTERACTIVE:
          check_drawables ();
          if (image_setup (drawable, FALSE))
            compute_image ();
        default:
          break;
        }
    }
  else
    {
      return pika_procedure_new_return_values (procedure,
                                               PIKA_PDB_EXECUTION_ERROR,
                                               NULL);
    }

  g_free (xpostab);
  g_free (ypostab);

  return pika_procedure_new_return_values (procedure, PIKA_PDB_SUCCESS, NULL);
}