Adding upstream version 2.10.34.upstream/2.10.34upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

30 files changed, 6270 insertions, 0 deletions

diff --git a/plug-ins/lighting/Makefile.am b/plug-ins/lighting/Makefile.am
new file mode 100644
index 0000000..92c3ce3
--- /dev/null
+++ b/plug-ins/lighting/Makefile.am
@@ -0,0 +1,65 @@
+## Process this file with automake to produce Makefile.in
+
+if OS_WIN32
+mwindows = -mwindows
+else
+libm = -lm
+endif
+
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+libgimpconfig = $(top_builddir)/libgimpconfig/libgimpconfig-$(GIMP_API_VERSION).la
+libgimpwidgets = $(top_builddir)/libgimpwidgets/libgimpwidgets-$(GIMP_API_VERSION).la
+libgimp = $(top_builddir)/libgimp/libgimp-$(GIMP_API_VERSION).la
+libgimpcolor = $(top_builddir)/libgimpcolor/libgimpcolor-$(GIMP_API_VERSION).la
+libgimpmath = $(top_builddir)/libgimpmath/libgimpmath-$(GIMP_API_VERSION).la
+libgimpbase = $(top_builddir)/libgimpbase/libgimpbase-$(GIMP_API_VERSION).la
+
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+endif
+
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+
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+
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+	lighting-apply.c	\
+	lighting-apply.h	\
+	lighting-image.c	\
+	lighting-image.h	\
+	lighting-main.c		\
+	lighting-main.h		\
+	lighting-preview.c	\
+	lighting-preview.h	\
+	lighting-shade.c	\
+	lighting-shade.h	\
+	lighting-stock.c	\
+	lighting-stock.h	\
+	lighting-ui.c		\
+	lighting-ui.h
+
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+	$(GTK_CFLAGS)	\
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+
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+	$(libm)			\
+	$(libgimpui)		\
+	$(libgimpwidgets)	\
+	$(libgimpconfig)	\
+	$(libgimp)		\
+	$(libgimpcolor)		\
+	$(libgimpmath)		\
+	$(libgimpbase)		\
+	$(GTK_LIBS)		\
+	$(GEGL_LIBS)		\
+	$(RT_LIBS)		\
+	$(INTLLIBS)		\
+	$(lighting_RC)
diff --git a/plug-ins/lighting/Makefile.in b/plug-ins/lighting/Makefile.in
new file mode 100644
index 0000000..96856de
--- /dev/null
+++ b/plug-ins/lighting/Makefile.in
@@ -0,0 +1,1156 @@
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+clean-libtool:
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+# This directory's subdirectories are mostly independent; you can cd
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+	  empty_fix=.; \
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
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+
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+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
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+	      install; \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
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+	-rm -f ./$(DEPDIR)/lighting-preview.Po
+	-rm -f ./$(DEPDIR)/lighting-shade.Po
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+	-rm -f ./$(DEPDIR)/lighting-ui.Po
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+@HAVE_WINDRES_TRUE@	$(WINDRES) --define ORIGINALFILENAME_STR="$*$(EXEEXT)" \
+@HAVE_WINDRES_TRUE@		--define INTERNALNAME_STR="$*" \
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+@HAVE_WINDRES_TRUE@		-I"`echo $(top_srcdir)/app | sed 's%/\+%/%'`" \
+@HAVE_WINDRES_TRUE@		-I"`echo $(top_builddir)/app | sed 's%/\+%/%'`"\
+@HAVE_WINDRES_TRUE@		-I"`echo $(top_builddir) | sed 's%/\+%/%'`"\
+@HAVE_WINDRES_TRUE@		$(GIMPPLUGINRC) $@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
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+.NOEXPORT:
diff --git a/plug-ins/lighting/README b/plug-ins/lighting/README
new file mode 100644
index 0000000..d723d61
--- /dev/null
+++ b/plug-ins/lighting/README
@@ -0,0 +1,39 @@
+
+Lighting Effects 0.2.2 -- image filter plug-in for GIMP
+===================================================================
+
+Copyright (C) 1996-98 Tom Bech
+Copyright (C) 1996-98 Federico Mena Quintero
+
+You can reach the author(s) via E-mail:
+tomb@gimp.org (Tom) or quartic@gimp.org (Federico).
+
+GIMP was developed by Peter Mattis and Spencer Kimball.
+You can contact them at gimp@xcf.berkeley.edu.
+
+There's more GIMP stuff on our home pages:
+http://www.ii.uib.no/~tomb/gimp.html (Tom's page)
+http://www.nuclecu.unam.mx/~federico/gimp/index.html (Quartic's page)
+
+
+Legal stuff
+===========
+
+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/>.
+
+In other words, you can't sue us for whatever happens while using this ;)
+
+Have fun,
+
+Tom
diff --git a/plug-ins/lighting/TODO b/plug-ins/lighting/TODO
new file mode 100644
index 0000000..06609de
--- /dev/null
+++ b/plug-ins/lighting/TODO
@@ -0,0 +1,15 @@
+
+The lighting plug-in "todo"-list:
+=================================
+
+* Supersampling/antialiasing
+* Bilinear filtering of environment map
+* Refraction back in?
+* Support for any-sized non-gray bump-maps.
+* Support for gray or alpha-channeled env-maps.
+* Zooming and scrolling in preview window
+* Autoconf/automake stuff
+* Put spotlight back in
+* Nicer interactive UI
+* Presets
+* Multiple light sources
diff --git a/plug-ins/lighting/images/Makefile.am b/plug-ins/lighting/images/Makefile.am
new file mode 100644
index 0000000..55dfbde
--- /dev/null
+++ b/plug-ins/lighting/images/Makefile.am
@@ -0,0 +1,29 @@
+## Process this file with automake to produce Makefile.in
+
+STOCK_IMAGES = \
+	stock-intensity-ambient-high.png	\
+	stock-intensity-ambient-low.png		\
+	stock-intensity-diffuse-high.png	\
+	stock-intensity-diffuse-low.png		\
+	stock-reflectivity-diffuse-high.png	\
+	stock-reflectivity-diffuse-low.png	\
+	stock-reflectivity-specular-high.png	\
+	stock-reflectivity-specular-low.png	\
+	stock-reflectivity-highlight-high.png	\
+	stock-reflectivity-highlight-low.png
+
+EXTRA_DIST = $(STOCK_IMAGES)
+
+noinst_DATA = stock-pixbufs.h
+CLEANFILES = $(noinst_DATA) stock-icons.list
+
+stock-icons.list: $(STOCK_IMAGES) Makefile.am
+	( rm -f $@; \
+          for image in $(STOCK_IMAGES); do \
+            echo $$image | \
+              sed -e 's|.*/||' -e 's|-|_|g' -e 's|\.png$$||' >> $@; \
+	    echo "  $(srcdir)/$$image" >> $@; \
+	  done )
+
+$(srcdir)/stock-pixbufs.h: stock-icons.list
+	$(GDK_PIXBUF_CSOURCE) --raw --build-list `cat stock-icons.list` > $(@F)
diff --git a/plug-ins/lighting/images/Makefile.in b/plug-ins/lighting/images/Makefile.in
new file mode 100644
index 0000000..0f01c96
--- /dev/null
+++ b/plug-ins/lighting/images/Makefile.in
@@ -0,0 +1,775 @@
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+# This program is distributed in the hope that it will be useful,
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+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-generic mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: all all-am check check-am clean clean-generic clean-libtool \
+	cscopelist-am ctags-am distclean distclean-generic \
+	distclean-libtool distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+stock-icons.list: $(STOCK_IMAGES) Makefile.am
+	( rm -f $@; \
+          for image in $(STOCK_IMAGES); do \
+            echo $$image | \
+              sed -e 's|.*/||' -e 's|-|_|g' -e 's|\.png$$||' >> $@; \
+	    echo "  $(srcdir)/$$image" >> $@; \
+	  done )
+
+$(srcdir)/stock-pixbufs.h: stock-icons.list
+	$(GDK_PIXBUF_CSOURCE) --raw --build-list `cat stock-icons.list` > $(@F)
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/plug-ins/lighting/images/stock-intensity-ambient-high.png b/plug-ins/lighting/images/stock-intensity-ambient-high.png
new file mode 100644
index 0000000..cb886ec
--- /dev/null
+++ b/plug-ins/lighting/images/stock-intensity-ambient-high.png
diff --git a/plug-ins/lighting/images/stock-intensity-ambient-low.png b/plug-ins/lighting/images/stock-intensity-ambient-low.png
new file mode 100644
index 0000000..fff7b45
--- /dev/null
+++ b/plug-ins/lighting/images/stock-intensity-ambient-low.png
diff --git a/plug-ins/lighting/images/stock-intensity-diffuse-high.png b/plug-ins/lighting/images/stock-intensity-diffuse-high.png
new file mode 100644
index 0000000..628ec4d
--- /dev/null
+++ b/plug-ins/lighting/images/stock-intensity-diffuse-high.png
diff --git a/plug-ins/lighting/images/stock-intensity-diffuse-low.png b/plug-ins/lighting/images/stock-intensity-diffuse-low.png
new file mode 100644
index 0000000..49e02bf
--- /dev/null
+++ b/plug-ins/lighting/images/stock-intensity-diffuse-low.png
diff --git a/plug-ins/lighting/images/stock-reflectivity-diffuse-high.png b/plug-ins/lighting/images/stock-reflectivity-diffuse-high.png
new file mode 100644
index 0000000..88cc4fa
--- /dev/null
+++ b/plug-ins/lighting/images/stock-reflectivity-diffuse-high.png
diff --git a/plug-ins/lighting/images/stock-reflectivity-diffuse-low.png b/plug-ins/lighting/images/stock-reflectivity-diffuse-low.png
new file mode 100644
index 0000000..6bdb5c4
--- /dev/null
+++ b/plug-ins/lighting/images/stock-reflectivity-diffuse-low.png
diff --git a/plug-ins/lighting/images/stock-reflectivity-highlight-high.png b/plug-ins/lighting/images/stock-reflectivity-highlight-high.png
new file mode 100644
index 0000000..b43724b
--- /dev/null
+++ b/plug-ins/lighting/images/stock-reflectivity-highlight-high.png
diff --git a/plug-ins/lighting/images/stock-reflectivity-highlight-low.png b/plug-ins/lighting/images/stock-reflectivity-highlight-low.png
new file mode 100644
index 0000000..88cc4fa
--- /dev/null
+++ b/plug-ins/lighting/images/stock-reflectivity-highlight-low.png
diff --git a/plug-ins/lighting/images/stock-reflectivity-specular-high.png b/plug-ins/lighting/images/stock-reflectivity-specular-high.png
new file mode 100644
index 0000000..fbd5f54
--- /dev/null
+++ b/plug-ins/lighting/images/stock-reflectivity-specular-high.png
diff --git a/plug-ins/lighting/images/stock-reflectivity-specular-low.png b/plug-ins/lighting/images/stock-reflectivity-specular-low.png
new file mode 100644
index 0000000..2d69d41
--- /dev/null
+++ b/plug-ins/lighting/images/stock-reflectivity-specular-low.png
diff --git a/plug-ins/lighting/lighting-apply.c b/plug-ins/lighting/lighting-apply.c
new file mode 100644
index 0000000..500ed24
--- /dev/null
+++ b/plug-ins/lighting/lighting-apply.c
@@ -0,0 +1,154 @@
+/******************************************************/
+/* Apply mapping and shading on the whole input image */
+/******************************************************/
+
+#include "config.h"
+
+#include <sys/types.h>
+
+#include <libgimp/gimp.h>
+
+#include "lighting-main.h"
+#include "lighting-image.h"
+#include "lighting-shade.h"
+#include "lighting-apply.h"
+
+#include "libgimp/stdplugins-intl.h"
+
+
+/*************/
+/* Main loop */
+/*************/
+
+void
+compute_image (void)
+{
+  gint         xcount, ycount;
+  GimpRGB      color;
+  glong        progress_counter = 0;
+  GimpVector3  p;
+  gint32       new_image_id = -1;
+  gint32       new_layer_id = -1;
+  gint32       index;
+  guchar      *row = NULL;
+  guchar       obpp;
+  gboolean     has_alpha;
+  get_ray_func ray_func;
+
+  if (mapvals.create_new_image == TRUE ||
+      (mapvals.transparent_background == TRUE &&
+       ! gimp_drawable_has_alpha (input_drawable_id)))
+    {
+      /* Create a new image */
+      /* ================== */
+
+      new_image_id = gimp_image_new (width, height, GIMP_RGB);
+
+      if (mapvals.transparent_background == TRUE)
+        {
+          /* Add a layer with an alpha channel */
+          /* ================================= */
+
+          new_layer_id = gimp_layer_new (new_image_id, "Background",
+					 width, height,
+					 GIMP_RGBA_IMAGE,
+					 100.0,
+					 gimp_image_get_default_new_layer_mode (new_image_id));
+        }
+      else
+        {
+          /* Create a "normal" layer */
+          /* ======================= */
+
+          new_layer_id = gimp_layer_new (new_image_id, "Background",
+					 width, height,
+					 GIMP_RGB_IMAGE,
+					 100.0,
+					 gimp_image_get_default_new_layer_mode (new_image_id));
+        }
+
+      gimp_image_insert_layer (new_image_id, new_layer_id, -1, 0);
+      output_drawable_id = new_layer_id;
+    }
+
+  if (mapvals.bump_mapped == TRUE && mapvals.bumpmap_id != -1)
+    {
+      bumpmap_setup (mapvals.bumpmap_id);
+    }
+
+  precompute_init (width, height);
+
+  if (! mapvals.env_mapped || mapvals.envmap_id == -1)
+    {
+      ray_func = get_ray_color;
+    }
+  else
+    {
+      envmap_setup (mapvals.envmap_id);
+
+      ray_func = get_ray_color_ref;
+    }
+
+  dest_buffer = gimp_drawable_get_shadow_buffer (output_drawable_id);
+
+  has_alpha = gimp_drawable_has_alpha (output_drawable_id);
+
+  /* FIXME */
+  obpp = has_alpha ? 4 : 3; //gimp_drawable_bpp (output_drawable_id);
+
+  row = g_new (guchar, obpp * width);
+
+  gimp_progress_init (_("Lighting Effects"));
+
+  /* Init the first row */
+  if (mapvals.bump_mapped == TRUE && mapvals.bumpmap_id != -1 && height >= 2)
+    interpol_row (0, width, 0);
+
+  for (ycount = 0; ycount < height; ycount++)
+    {
+      if (mapvals.bump_mapped == TRUE && mapvals.bumpmap_id != -1)
+	precompute_normals (0, width, ycount);
+
+      index = 0;
+
+      for (xcount = 0; xcount < width; xcount++)
+	{
+	  p = int_to_pos (xcount, ycount);
+	  color = (* ray_func) (&p);
+
+	  row[index++] = (guchar) (color.r * 255.0);
+	  row[index++] = (guchar) (color.g * 255.0);
+	  row[index++] = (guchar) (color.b * 255.0);
+
+	  if (has_alpha)
+	    row[index++] = (guchar) (color.a * 255.0);
+
+	  progress_counter++;
+	}
+
+      gimp_progress_update ((gdouble) progress_counter /
+                            (gdouble) maxcounter);
+
+      gegl_buffer_set (dest_buffer, GEGL_RECTANGLE (0, ycount, width, 1), 0,
+                       has_alpha ?
+                       babl_format ("R'G'B'A u8") : babl_format ("R'G'B' u8"),
+                       row,
+                       GEGL_AUTO_ROWSTRIDE);
+    }
+
+  gimp_progress_update (1.0);
+
+  g_free (row);
+
+  g_object_unref (dest_buffer);
+
+  gimp_drawable_merge_shadow (output_drawable_id, TRUE);
+  gimp_drawable_update (output_drawable_id, 0, 0, width, height);
+
+  if (new_image_id!=-1)
+    {
+      gimp_display_new (new_image_id);
+      gimp_displays_flush ();
+    }
+
+}
diff --git a/plug-ins/lighting/lighting-apply.h b/plug-ins/lighting/lighting-apply.h
new file mode 100644
index 0000000..304ef4a
--- /dev/null
+++ b/plug-ins/lighting/lighting-apply.h
@@ -0,0 +1,7 @@
+#ifndef __LIGHTING_APPLY_H__
+#define __LIGHTING_APPLY_H__
+
+void init_compute  (void);
+void compute_image (void);
+
+#endif  /* __LIGHTING_APPLY_H__ */
diff --git a/plug-ins/lighting/lighting-image.c b/plug-ins/lighting/lighting-image.c
new file mode 100644
index 0000000..671176f
--- /dev/null
+++ b/plug-ins/lighting/lighting-image.c
@@ -0,0 +1,410 @@
+/*************************************/
+/* GIMP image manipulation routines. */
+/*************************************/
+
+#include "config.h"
+
+#include <gtk/gtk.h>
+
+#include <libgimp/gimp.h>
+
+#include "lighting-main.h"
+#include "lighting-image.h"
+#include "lighting-preview.h"
+#include "lighting-ui.h"
+
+
+gint32      input_drawable_id;
+gint32      output_drawable_id;
+GeglBuffer *source_buffer;
+GeglBuffer *dest_buffer;
+
+gint32      bump_drawable_id;
+GeglBuffer *bump_buffer;
+const Babl *bump_format;
+
+gint32      env_drawable_id;
+GeglBuffer *env_buffer;
+
+guchar          *preview_rgb_data = NULL;
+gint             preview_rgb_stride;
+cairo_surface_t *preview_surface = NULL;
+
+glong   maxcounter;
+gint    width, height;
+gint    env_width, env_height;
+GimpRGB background;
+
+gint border_x1, border_y1, border_x2, border_y2;
+
+guchar sinemap[256], spheremap[256], logmap[256];
+
+/******************/
+/* Implementation */
+/******************/
+
+guchar
+peek_map (GeglBuffer *buffer,
+          const Babl *format,
+	  gint        x,
+	  gint        y)
+{
+  guchar data[4];
+  guchar ret_val;
+
+  gegl_buffer_sample (buffer, x, y, NULL, data, format,
+                      GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
+
+  if (babl_format_get_bytes_per_pixel (format))
+    {
+      ret_val = data[0];
+    }
+  else
+    {
+      ret_val = (guchar)((float)((data[0] + data[1] + data[2])/3.0));
+    }
+
+  return ret_val;
+}
+
+GimpRGB
+peek (gint x,
+      gint y)
+{
+  GimpRGB color;
+
+  gegl_buffer_sample (source_buffer, x, y, NULL,
+                      &color, babl_format ("R'G'B'A double"),
+                      GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
+
+  if (! babl_format_has_alpha (gegl_buffer_get_format (source_buffer)))
+    color.a = 1.0;
+
+  return color;
+}
+
+GimpRGB
+peek_env_map (gint x,
+	      gint y)
+{
+  GimpRGB color;
+
+  if (x < 0)
+    x = 0;
+  else if (x >= env_width)
+    x = env_width - 1;
+  if (y < 0)
+    y = 0;
+  else if (y >= env_height)
+    y = env_height - 1;
+
+  gegl_buffer_sample (env_buffer, x, y, NULL,
+                      &color, babl_format ("R'G'B'A double"),
+                      GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
+
+  color.a = 1.0;
+
+  return color;
+}
+
+void
+poke (gint    x,
+      gint    y,
+      GimpRGB *color)
+{
+  if (x < 0)
+    x = 0;
+  else if (x >= width)
+    x = width - 1;
+  if (y < 0)
+    y = 0;
+  else if (y >= height)
+    y = height - 1;
+
+  gegl_buffer_set (dest_buffer, GEGL_RECTANGLE (x, y, 1, 1), 0,
+                   babl_format ("R'G'B'A double"), color,
+                   GEGL_AUTO_ROWSTRIDE);
+}
+
+gint
+check_bounds (gint x,
+	      gint y)
+{
+  if (x < border_x1 ||
+      y < border_y1 ||
+      x >= border_x2 ||
+      y >= border_y2)
+    return FALSE;
+  else
+    return TRUE;
+}
+
+GimpVector3
+int_to_pos (gint x,
+	    gint y)
+{
+  GimpVector3 pos;
+
+  if (width >= height)
+    {
+      pos.x = (gdouble) x / (gdouble) width;
+      pos.y = (gdouble) y / (gdouble) width;
+
+      pos.y += 0.5 * (1.0 - (gdouble) height / (gdouble) width);
+    }
+  else
+    {
+      pos.x = (gdouble) x / (gdouble) height;
+      pos.y = (gdouble) y / (gdouble) height;
+
+      pos.x += 0.5 * (1.0 - (gdouble) width / (gdouble) height);
+    }
+
+  pos.z = 0.0;
+  return pos;
+}
+
+GimpVector3
+int_to_posf (gdouble x,
+	     gdouble y)
+{
+  GimpVector3 pos;
+
+  if (width >= height)
+    {
+      pos.x = x / (gdouble) width;
+      pos.y = y / (gdouble) width;
+
+      pos.y += 0.5 * (1.0 - (gdouble) height / (gdouble) width);
+    }
+  else
+    {
+      pos.x = x / (gdouble) height;
+      pos.y = y / (gdouble) height;
+
+      pos.x += 0.5 * (1.0 - (gdouble) width / (gdouble) height);
+    }
+
+  pos.z = 0.0;
+  return pos;
+}
+
+void
+pos_to_int (gdouble  x,
+	    gdouble  y,
+	    gint    *scr_x,
+	    gint    *scr_y)
+{
+  if (width >= height)
+    {
+      y -= 0.5 * (1.0 - (gdouble) height / (gdouble) width);
+      *scr_x = RINT ((x * (gdouble) width));
+      *scr_y = RINT ((y * (gdouble) width));
+    }
+  else
+    {
+      x -= 0.5 * (1.0 - (gdouble) width / (gdouble) height);
+
+      *scr_x = RINT ((x * (gdouble) height));
+      *scr_y = RINT ((y  *(gdouble) height));
+    }
+}
+
+void
+pos_to_float (gdouble  x,
+	      gdouble  y,
+	      gdouble *xf,
+	      gdouble *yf)
+{
+  if (width >= height)
+    {
+      y -= 0.5 * (1.0 - (gdouble) height / (gdouble) width);
+
+      *xf = x * (gdouble) (width-1);
+      *yf = y * (gdouble) (width-1);
+    }
+  else
+    {
+      x -= 0.5 * (1.0 - (gdouble) width / (gdouble) height);
+
+      *xf = x * (gdouble) (height-1);
+      *yf = y * (gdouble) (height-1);
+    }
+}
+
+/**********************************************/
+/* Compute the image color at pos (u,v) using */
+/* Quartics bilinear interpolation stuff.     */
+/**********************************************/
+
+GimpRGB
+get_image_color (gdouble  u,
+		 gdouble  v,
+		 gint    *inside)
+{
+  gint    x1, y1, x2, y2;
+  GimpRGB p[4];
+
+  x1 = RINT (u);
+  y1 = RINT (v);
+
+  if (check_bounds (x1, y1) == FALSE)
+    {
+      *inside = FALSE;
+      return background;
+    }
+
+  x2 = (x1 + 1);
+  y2 = (y1 + 1);
+
+  if (check_bounds (x2, y2) == FALSE)
+    {
+      *inside = TRUE;
+      return peek (x1, y1);
+    }
+
+  *inside = TRUE;
+  p[0] = peek (x1, y1);
+  p[1] = peek (x2, y1);
+  p[2] = peek (x1, y2);
+  p[3] = peek (x2, y2);
+
+  return gimp_bilinear_rgba (u, v, p);
+}
+
+gdouble
+get_map_value (GeglBuffer *buffer,
+               const Babl *format,
+	       gdouble     u,
+	       gdouble     v,
+	       gint       *inside)
+{
+  gint    x1, y1, x2, y2;
+  gdouble p[4];
+
+  x1 = RINT (u);
+  y1 = RINT (v);
+
+  x2 = (x1 + 1);
+  y2 = (y1 + 1);
+
+  if (check_bounds (x2, y2) == FALSE)
+    {
+      *inside = TRUE;
+      return (gdouble) peek_map (buffer, format, x1, y1);
+    }
+
+  *inside = TRUE;
+  p[0] = (gdouble) peek_map (buffer, format, x1, y1);
+  p[1] = (gdouble) peek_map (buffer, format, x2, y1);
+  p[2] = (gdouble) peek_map (buffer, format, x1, y2);
+  p[3] = (gdouble) peek_map (buffer, format, x2, y2);
+
+  return gimp_bilinear (u, v, p);
+}
+
+static void
+compute_maps (void)
+{
+  gint    x;
+  gdouble val, c, d;
+
+  /* Compute Sine, Log and Spherical transfer function maps */
+  /* ====================================================== */
+
+  c = 1.0  / 255.0;
+  d = 1.15 * 255.0;
+
+  for (x = 0; x < 256; x++)
+    {
+      sinemap[x] = (guchar) (255.0 * (0.5 * (sin ((G_PI * c * (gdouble) x) -
+						  0.5 * G_PI) +
+					     1.0)));
+      spheremap[x] = (guchar) (255.0 * (sqrt (sin (G_PI * (gdouble) x /
+						   512.0))));
+      val = (d * exp (-1.0 / (8.0 * c * ((gdouble) x + 5.0))));
+
+      if (val > 255.0)
+        val = 255.0;
+      logmap[x] = (guchar) val;
+    }
+}
+
+/****************************************/
+/* Allocate memory for temporary images */
+/****************************************/
+
+gint
+image_setup (gint32 drawable_id,
+	     gint   interactive)
+{
+  gint	   w, h;
+  gboolean ret;
+
+  compute_maps ();
+
+  /* Get some useful info on the input drawable */
+  /* ========================================== */
+
+  input_drawable_id  = drawable_id;
+  output_drawable_id = drawable_id;
+
+  ret = gimp_drawable_mask_intersect (drawable_id,
+                                      &border_x1, &border_y1, &w, &h);
+
+  border_x2 = border_x1 + w;
+  border_y2 = border_y1 + h;
+
+  if (! ret)
+    return FALSE;
+
+  width  = gimp_drawable_width  (input_drawable_id);
+  height = gimp_drawable_height (input_drawable_id);
+
+  source_buffer = gimp_drawable_get_buffer (input_drawable_id);
+
+  maxcounter = (glong) width * (glong) height;
+
+  if (interactive)
+    {
+      preview_rgb_stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24,
+                                                          PREVIEW_WIDTH);
+      preview_rgb_data = g_new0 (guchar, preview_rgb_stride * PREVIEW_HEIGHT);
+      preview_surface = cairo_image_surface_create_for_data (preview_rgb_data,
+                                                             CAIRO_FORMAT_RGB24,
+                                                             PREVIEW_WIDTH,
+                                                             PREVIEW_HEIGHT,
+                                                             preview_rgb_stride);
+    }
+
+  return TRUE;
+}
+
+void
+bumpmap_setup (gint32 bumpmap_id)
+{
+  if (bumpmap_id != -1)
+    {
+      if (! bump_buffer)
+        {
+          bump_buffer = gimp_drawable_get_buffer (bumpmap_id);
+        }
+
+      if (gimp_drawable_is_rgb (bumpmap_id))
+        bump_format = babl_format ("R'G'B' u8");
+      else
+        bump_format = babl_format ("Y' u8"); /* FIXME */
+    }
+}
+
+void
+envmap_setup (gint32 envmap_id)
+{
+  if (envmap_id != -1 && ! env_buffer)
+    {
+      env_width  = gimp_drawable_width  (envmap_id);
+      env_height = gimp_drawable_height (envmap_id);
+
+      env_buffer = gimp_drawable_get_buffer (envmap_id);
+    }
+}
diff --git a/plug-ins/lighting/lighting-image.h b/plug-ins/lighting/lighting-image.h
new file mode 100644
index 0000000..817c948
--- /dev/null
+++ b/plug-ins/lighting/lighting-image.h
@@ -0,0 +1,69 @@
+#ifndef __LIGHTING_IMAGE_H__
+#define __LIGHTING_IMAGE_H__
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+extern gint32      input_drawable_id;
+extern gint32      output_drawable_id;
+extern GeglBuffer *source_buffer;
+extern GeglBuffer *dest_buffer;
+
+extern gint32      bump_drawable_id;
+extern GeglBuffer *bump_buffer;
+extern const Babl *bump_format;
+
+extern gint32      env_drawable_id;
+extern GeglBuffer *env_buffer;
+
+extern guchar          *preview_rgb_data;
+extern gint             preview_rgb_stride;
+extern cairo_surface_t *preview_surface;
+
+extern glong   maxcounter;
+extern gint    width,height,env_width,env_height;
+extern GimpRGB background;
+
+extern gint   border_x1, border_y1, border_x2, border_y2;
+
+extern guchar sinemap[256], spheremap[256], logmap[256];
+
+guchar         peek_map        (GeglBuffer   *buffer,
+                                const Babl   *format,
+				gint          x,
+				gint          y);
+GimpRGB        peek            (gint          x,
+				gint          y);
+GimpRGB        peek_env_map    (gint          x,
+				gint          y);
+void           poke            (gint          x,
+				gint          y,
+				GimpRGB       *color);
+gint           check_bounds    (gint          x,
+				gint          y);
+GimpVector3    int_to_pos      (gint          x,
+				gint          y);
+GimpVector3    int_to_posf     (gdouble       x,
+				gdouble       y);
+void           pos_to_int      (gdouble       x,
+				gdouble       y,
+				gint         *scr_x,
+				gint         *scr_y);
+void           pos_to_float    (gdouble       x,
+				gdouble       y,
+				gdouble      *xf,
+				gdouble      *yf);
+GimpRGB        get_image_color (gdouble       u,
+				gdouble       v,
+				gint         *inside);
+gdouble        get_map_value   (GeglBuffer   *buffer,
+                                const Babl   *format,
+				gdouble       u,
+				gdouble       v,
+				gint         *inside);
+gint           image_setup     (gint32        drawable_id,
+				gint          interactive);
+void           bumpmap_setup   (gint32        bumpmap_id);
+void           envmap_setup    (gint32        envmap_id);
+
+#endif  /* __LIGHTING_IMAGE_H__ */
diff --git a/plug-ins/lighting/lighting-main.c b/plug-ins/lighting/lighting-main.c
new file mode 100644
index 0000000..f732b3c
--- /dev/null
+++ b/plug-ins/lighting/lighting-main.c
@@ -0,0 +1,330 @@
+/* Lighting Effects 0.2.2 -- image filter plug-in for GIMP
+ *
+ * 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 <libgimp/gimp.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 "libgimp/stdplugins-intl.h"
+
+
+LightingValues mapvals;
+
+/******************/
+/* Implementation */
+/******************/
+
+/*************************************/
+/* Set parameters to standard values */
+/*************************************/
+
+static void
+set_default_settings (void)
+{
+  gint k;
+
+  mapvals.update_enabled = TRUE;
+  mapvals.light_selected = 0;
+  mapvals.light_isolated = FALSE;
+
+  gimp_vector3_set (&mapvals.viewpoint,   0.5, 0.5, 0.25);
+  gimp_vector3_set (&mapvals.planenormal, 0.0, 0.0, 1.0);
+
+  gimp_vector3_set (&mapvals.lightsource[0].position,  -1.0, -1.0, 1.0);
+  gimp_vector3_set (&mapvals.lightsource[0].direction, -1.0, -1.0, 1.0);
+
+  gimp_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 */
+  gimp_vector3_set (&mapvals.lightsource[1].position,   2.0, -1.0, 1.0);
+  gimp_vector3_set (&mapvals.lightsource[1].direction,  1.0, -1.0, 1.0);
+
+  gimp_vector3_set (&mapvals.lightsource[2].position,   1.0,  2.0, 1.0);
+  gimp_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++)
+    {
+      gimp_vector3_set (&mapvals.lightsource[k].position,   0.0,  0.0, 1.0);
+      gimp_vector3_set (&mapvals.lightsource[k].direction,  0.0,  0.0, 1.0);
+    }
+
+  for (k = 1; k < NUM_LIGHTS; k++)
+    {
+      gimp_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)
+{
+  if (mapvals.bump_mapped)
+    {
+      if (mapvals.bumpmap_id != -1 &&
+          gimp_item_get_image (mapvals.bumpmap_id) == -1)
+        {
+          mapvals.bump_mapped = FALSE;
+          mapvals.bumpmap_id  = -1;
+        }
+
+      if (gimp_drawable_is_indexed (mapvals.bumpmap_id) ||
+          (gimp_drawable_width (mapvals.drawable_id) !=
+           gimp_drawable_width (mapvals.bumpmap_id)) ||
+          (gimp_drawable_height (mapvals.drawable_id) !=
+           gimp_drawable_height (mapvals.bumpmap_id)))
+        {
+          mapvals.bump_mapped = FALSE;
+          mapvals.bumpmap_id  = -1;
+        }
+    }
+
+  if (mapvals.env_mapped)
+    {
+      if (mapvals.envmap_id != -1 &&
+          gimp_item_get_image (mapvals.envmap_id) == -1)
+        {
+          mapvals.env_mapped = FALSE;
+          mapvals.envmap_id  = -1;
+        }
+
+      if (gimp_drawable_is_gray (mapvals.envmap_id) ||
+          gimp_drawable_has_alpha (mapvals.envmap_id))
+        {
+          mapvals.env_mapped = FALSE;
+          mapvals.envmap_id  = -1;
+        }
+    }
+}
+
+static void
+query (void)
+{
+  static const GimpParamDef args[] =
+  {
+    { GIMP_PDB_INT32,    "run-mode",              "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
+    { GIMP_PDB_IMAGE,    "image",                 "Input image" },
+    { GIMP_PDB_DRAWABLE, "drawable",              "Input drawable" },
+    { GIMP_PDB_DRAWABLE, "bumpdrawable",          "Bumpmap drawable (set to 0 if disabled)" },
+    { GIMP_PDB_DRAWABLE, "envdrawable",           "Environmentmap drawable (set to 0 if disabled)" },
+    { GIMP_PDB_INT32,    "dobumpmap",             "Enable bumpmapping (TRUE/FALSE)" },
+    { GIMP_PDB_INT32,    "doenvmap",              "Enable envmapping (TRUE/FALSE)" },
+    { GIMP_PDB_INT32,    "bumpmaptype",           "Type of mapping (0=linear,1=log, 2=sinusoidal, 3=spherical)" },
+    { GIMP_PDB_INT32,    "lighttype",             "Type of lightsource (0=point,1=directional,3=spot,4=none)" },
+    { GIMP_PDB_COLOR,    "lightcolor",            "Lightsource color (r,g,b)" },
+    { GIMP_PDB_FLOAT,    "lightposition-x",       "Lightsource position (x,y,z)" },
+    { GIMP_PDB_FLOAT,    "lightposition-y",       "Lightsource position (x,y,z)" },
+    { GIMP_PDB_FLOAT,    "lightposition-z",       "Lightsource position (x,y,z)" },
+    { GIMP_PDB_FLOAT,    "lightdirection-x",      "Lightsource direction [x,y,z]" },
+    { GIMP_PDB_FLOAT,    "lightdirection-y",      "Lightsource direction [x,y,z]" },
+    { GIMP_PDB_FLOAT,    "lightdirection-z",      "Lightsource direction [x,y,z]" },
+    { GIMP_PDB_FLOAT,    "ambient-intensity",     "Material ambient intensity (0..1)" },
+    { GIMP_PDB_FLOAT,    "diffuse-intensity",     "Material diffuse intensity (0..1)" },
+    { GIMP_PDB_FLOAT,    "diffuse-reflectivity",  "Material diffuse reflectivity (0..1)" },
+    { GIMP_PDB_FLOAT,    "specular-reflectivity", "Material specular reflectivity (0..1)" },
+    { GIMP_PDB_FLOAT,    "highlight",             "Material highlight (0..->), note: it's exponential" },
+    { GIMP_PDB_INT32,    "antialiasing",          "Apply antialiasing (TRUE/FALSE)" },
+    { GIMP_PDB_INT32,    "newimage",              "Create a new image (TRUE/FALSE)" },
+    { GIMP_PDB_INT32,    "transparentbackground", "Make background transparent (TRUE/FALSE)" }
+  };
+
+  gimp_install_procedure (PLUG_IN_PROC,
+                          N_("Apply various lighting effects to an image"),
+                          "No help yet",
+                          "Tom Bech & Federico Mena Quintero",
+                          "Tom Bech & Federico Mena Quintero",
+                          "Version 0.2.0, March 15 1998",
+                          N_("_Lighting Effects..."),
+                          "RGB*",
+                          GIMP_PLUGIN,
+                          G_N_ELEMENTS (args), 0,
+                          args, NULL);
+
+  gimp_plugin_menu_register (PLUG_IN_PROC,
+                             "<Image>/Filters/Light and Shadow/Light");
+}
+
+static void
+run (const gchar      *name,
+     gint              nparams,
+     const GimpParam  *param,
+     gint             *nreturn_vals,
+     GimpParam       **return_vals)
+{
+  static GimpParam   values[1];
+  GimpRunMode        run_mode;
+  gint32             drawable_id;
+  GimpPDBStatusType  status = GIMP_PDB_SUCCESS;
+
+  INIT_I18N ();
+  gegl_init (NULL, NULL);
+
+  *nreturn_vals = 1;
+  *return_vals = values;
+
+  values[0].type = GIMP_PDB_STATUS;
+  values[0].data.d_status = status;
+
+  /* Set default values */
+  /* ================== */
+
+  set_default_settings ();
+
+  /* Possibly retrieve data */
+  /* ====================== */
+
+  gimp_get_data (PLUG_IN_PROC, &mapvals);
+
+  /* Get the specified drawable */
+  /* ========================== */
+
+  run_mode    = param[0].data.d_int32;
+  drawable_id = param[2].data.d_drawable;
+
+  mapvals.drawable_id = drawable_id;
+
+  check_drawables ();
+
+  if (status == GIMP_PDB_SUCCESS)
+    {
+      /* Make sure that the drawable is RGBA or RGB color */
+      /* ================================================ */
+
+      if (gimp_drawable_is_rgb (drawable_id))
+        {
+          switch (run_mode)
+            {
+              case GIMP_RUN_INTERACTIVE:
+                if (main_dialog (drawable_id))
+                  {
+                    compute_image ();
+
+                    gimp_set_data (PLUG_IN_PROC,
+                                   &mapvals, sizeof (LightingValues));
+                    gimp_displays_flush ();
+                  }
+              break;
+
+              case GIMP_RUN_WITH_LAST_VALS:
+                if (image_setup (drawable_id, FALSE))
+                  compute_image ();
+                gimp_displays_flush ();
+                break;
+
+              case GIMP_RUN_NONINTERACTIVE:
+                if (nparams != 24)
+                  {
+                    status = GIMP_PDB_CALLING_ERROR;
+                  }
+                else
+                  {
+                    mapvals.bumpmap_id                 = param[3].data.d_drawable;
+                    mapvals.envmap_id                  = param[4].data.d_drawable;
+                    mapvals.bump_mapped                = (gint) param[5].data.d_int32;
+                    mapvals.env_mapped                 = (gint) param[6].data.d_int32;
+                    mapvals.bumpmaptype                = (gint) param[7].data.d_int32;
+                    mapvals.lightsource[0].type        = (LightType) param[8].data.d_int32;
+                    mapvals.lightsource[0].color       = param[9].data.d_color;
+                    mapvals.lightsource[0].position.x  = param[10].data.d_float;
+                    mapvals.lightsource[0].position.y  = param[11].data.d_float;
+                    mapvals.lightsource[0].position.z  = param[12].data.d_float;
+                    mapvals.lightsource[0].direction.x = param[13].data.d_float;
+                    mapvals.lightsource[0].direction.y = param[14].data.d_float;
+                    mapvals.lightsource[0].direction.z = param[15].data.d_float;
+                    mapvals.material.ambient_int       = param[16].data.d_float;
+                    mapvals.material.diffuse_int       = param[17].data.d_float;
+                    mapvals.material.diffuse_ref       = param[18].data.d_float;
+                    mapvals.material.specular_ref      = param[19].data.d_float;
+                    mapvals.material.highlight         = param[20].data.d_float;
+                    mapvals.antialiasing               = (gint) param[21].data.d_int32;
+                    mapvals.create_new_image           = (gint) param[22].data.d_int32;
+                    mapvals.transparent_background     = (gint) param[23].data.d_int32;
+
+                    check_drawables ();
+                    if (image_setup (drawable_id, FALSE))
+                      compute_image ();
+                  }
+              default:
+                break;
+            }
+        }
+      else
+        {
+          status = GIMP_PDB_EXECUTION_ERROR;
+        }
+    }
+
+  values[0].data.d_status = status;
+
+  g_free (xpostab);
+  g_free (ypostab);
+}
+
+const GimpPlugInInfo PLUG_IN_INFO =
+{
+  NULL,  /* init_proc  */
+  NULL,  /* quit_proc  */
+  query, /* query_proc */
+  run,   /* run_proc   */
+};
+
+MAIN ()
diff --git a/plug-ins/lighting/lighting-main.h b/plug-ins/lighting/lighting-main.h
new file mode 100644
index 0000000..f547b2d
--- /dev/null
+++ b/plug-ins/lighting/lighting-main.h
@@ -0,0 +1,104 @@
+#ifndef __LIGHTING_MAIN_H__
+#define __LIGHTING_MAIN_H__
+
+/* Defines and stuff */
+/* ================= */
+
+#define PLUG_IN_PROC   "plug-in-lighting"
+#define PLUG_IN_BINARY "lighting"
+#define PLUG_IN_ROLE   "gimp-lighting"
+
+#define TILE_CACHE_SIZE 16
+#define NUM_LIGHTS      6
+
+/* Typedefs */
+/* ======== */
+
+typedef enum
+{
+  POINT_LIGHT,
+  DIRECTIONAL_LIGHT,
+  SPOT_LIGHT,
+  NO_LIGHT
+} LightType;
+
+enum
+{
+  LINEAR_MAP,
+  LOGARITHMIC_MAP,
+  SINUSOIDAL_MAP,
+  SPHERICAL_MAP
+};
+
+enum
+{
+  IMAGE_BUMP,
+  WAVES_BUMP
+};
+
+typedef struct
+{
+  gdouble     ambient_int;
+  gdouble     diffuse_int;
+  gdouble     diffuse_ref;
+  gdouble     specular_ref;
+  gdouble     highlight;
+  gboolean    metallic;
+  GimpRGB     color;
+} MaterialSettings;
+
+typedef struct
+{
+  LightType    type;
+  GimpVector3  position;
+  GimpVector3  direction;
+  GimpRGB      color;
+  gdouble      intensity;
+  gboolean     active;
+} LightSettings;
+
+typedef struct
+{
+  gint32       drawable_id;
+  gint32       bumpmap_id;
+  gint32       envmap_id;
+
+  /* Render variables */
+  /* ================ */
+
+  GimpVector3      viewpoint;
+  GimpVector3      planenormal;
+  LightSettings    lightsource[NUM_LIGHTS];
+  MaterialSettings material;
+  MaterialSettings ref_material;
+
+  gdouble      pixel_threshold;
+  gdouble      bumpmax,bumpmin;
+  gint         max_depth;
+  gint         bumpmaptype;
+
+  /* Flags */
+  gint         antialiasing;
+  gint         create_new_image;
+  gint         transparent_background;
+  gint         bump_mapped;
+  gint         env_mapped;
+  gint         ref_mapped;
+  gint         bumpstretch;
+  gint         previewquality;
+  gboolean     symbols;
+  gboolean     interactive_preview;
+
+  /* Misc */
+  gboolean     update_enabled;
+  gint         light_selected;
+  gboolean     light_isolated;
+  gdouble      preview_zoom_factor;
+} LightingValues;
+
+/* Externally visible variables */
+/* ============================ */
+
+extern LightingValues mapvals;
+
+#endif  /* __LIGHTING_MAIN_H__ */
diff --git a/plug-ins/lighting/lighting-preview.c b/plug-ins/lighting/lighting-preview.c
new file mode 100644
index 0000000..e4bbd26
--- /dev/null
+++ b/plug-ins/lighting/lighting-preview.c
@@ -0,0 +1,496 @@
+/*************************************************/
+/* Compute a preview image and preview wireframe */
+/*************************************************/
+
+#include "config.h"
+
+#include <gtk/gtk.h>
+
+#include <libgimp/gimp.h>
+#include <libgimpmath/gimpmath.h>
+
+#include "lighting-main.h"
+#include "lighting-ui.h"
+#include "lighting-image.h"
+#include "lighting-apply.h"
+#include "lighting-shade.h"
+
+#include "lighting-preview.h"
+
+
+#define LIGHT_SYMBOL_SIZE 8
+
+static gint handle_xpos = 0, handle_ypos = 0;
+
+/* g_free()'ed on exit */
+gdouble *xpostab = NULL;
+gdouble *ypostab = NULL;
+
+static gint xpostab_size = -1;  /* if preview size change, do realloc */
+static gint ypostab_size = -1;
+
+static gboolean    light_hit           = FALSE;
+static gboolean    left_button_pressed = FALSE;
+static guint preview_update_timer = 0;
+
+
+/* Protos */
+/* ====== */
+static gboolean
+interactive_preview_timer_callback ( gpointer data );
+
+static void
+compute_preview (gint startx, gint starty, gint w, gint h)
+{
+  gint xcnt, ycnt, f1, f2;
+  guchar r, g, b;
+  gdouble imagex, imagey;
+  gint32 index = 0;
+  GimpRGB color;
+  GimpRGB lightcheck, darkcheck;
+  GimpVector3 pos;
+  get_ray_func ray_func;
+
+  if (xpostab_size != w)
+    {
+      if (xpostab)
+        {
+          g_free (xpostab);
+          xpostab = NULL;
+        }
+    }
+
+  if (!xpostab)
+    {
+      xpostab = g_new (gdouble, w);
+      xpostab_size = w;
+    }
+
+  if (ypostab_size != h)
+    {
+      if (ypostab)
+        {
+          g_free (ypostab);
+          ypostab = NULL;
+        }
+    }
+
+  if (!ypostab)
+    {
+      ypostab = g_new (gdouble, h);
+      ypostab_size = h;
+    }
+
+  for (xcnt = 0; xcnt < w; xcnt++)
+    xpostab[xcnt] = (gdouble) width *((gdouble) xcnt / (gdouble) w);
+  for (ycnt = 0; ycnt < h; ycnt++)
+    ypostab[ycnt] = (gdouble) height *((gdouble) ycnt / (gdouble) h);
+
+  precompute_init (width, height);
+
+  gimp_rgba_set (&lightcheck,
+                 GIMP_CHECK_LIGHT, GIMP_CHECK_LIGHT, GIMP_CHECK_LIGHT,
+                 1.0);
+  gimp_rgba_set (&darkcheck, GIMP_CHECK_DARK, GIMP_CHECK_DARK,
+                 GIMP_CHECK_DARK, 1.0);
+
+  if (mapvals.bump_mapped == TRUE && mapvals.bumpmap_id != -1)
+    {
+      bumpmap_setup (mapvals.bumpmap_id);
+    }
+
+  imagey = 0;
+
+  if (mapvals.previewquality)
+    ray_func = get_ray_color;
+  else
+    ray_func = get_ray_color_no_bilinear;
+
+  if (mapvals.env_mapped == TRUE && mapvals.envmap_id != -1)
+    {
+      envmap_setup (mapvals.envmap_id);
+
+      if (mapvals.previewquality)
+        ray_func = get_ray_color_ref;
+      else
+        ray_func = get_ray_color_no_bilinear_ref;
+    }
+
+  cairo_surface_flush (preview_surface);
+
+  for (ycnt = 0; ycnt < PREVIEW_HEIGHT; ycnt++)
+    {
+      index = ycnt * preview_rgb_stride;
+      for (xcnt = 0; xcnt < PREVIEW_WIDTH; xcnt++)
+        {
+          if ((ycnt >= starty && ycnt < (starty + h)) &&
+              (xcnt >= startx && xcnt < (startx + w)))
+            {
+              imagex = xpostab[xcnt - startx];
+              imagey = ypostab[ycnt - starty];
+              pos = int_to_posf (imagex, imagey);
+
+              if (mapvals.bump_mapped == TRUE &&
+                  mapvals.bumpmap_id != -1 &&
+                  xcnt == startx)
+                {
+                  pos_to_float (pos.x, pos.y, &imagex, &imagey);
+                  precompute_normals (0, width, RINT (imagey));
+                }
+
+              color = (*ray_func) (&pos);
+
+              if (color.a < 1.0)
+                {
+                  f1 = ((xcnt % 32) < 16);
+                  f2 = ((ycnt % 32) < 16);
+                  f1 = f1 ^ f2;
+
+                  if (f1)
+                    {
+                      if (color.a == 0.0)
+                        color = lightcheck;
+                      else
+                        gimp_rgb_composite (&color,
+                                            &lightcheck,
+                                            GIMP_RGB_COMPOSITE_BEHIND);
+                    }
+                  else
+                    {
+                      if (color.a == 0.0)
+                        color = darkcheck;
+                      else
+                        gimp_rgb_composite (&color,
+                                            &darkcheck,
+                                            GIMP_RGB_COMPOSITE_BEHIND);
+                    }
+                }
+
+              gimp_rgb_get_uchar (&color, &r, &g, &b);
+              GIMP_CAIRO_RGB24_SET_PIXEL((preview_rgb_data + index), r, g, b);
+              index += 4;
+              imagex++;
+            }
+          else
+            {
+              preview_rgb_data[index++] = 200;
+              preview_rgb_data[index++] = 200;
+              preview_rgb_data[index++] = 200;
+              index++;
+            }
+        }
+    }
+  cairo_surface_mark_dirty (preview_surface);
+}
+
+static void
+compute_preview_rectangle (gint * xp, gint * yp, gint * wid, gint * heig)
+{
+  gdouble x, y, w, h;
+
+  if (width >= height)
+    {
+      w = (PREVIEW_WIDTH - 50.0);
+      h = (gdouble) height *(w / (gdouble) width);
+
+      x = (PREVIEW_WIDTH - w) / 2.0;
+      y = (PREVIEW_HEIGHT - h) / 2.0;
+    }
+  else
+    {
+      h = (PREVIEW_HEIGHT - 50.0);
+      w = (gdouble) width *(h / (gdouble) height);
+      x = (PREVIEW_WIDTH - w) / 2.0;
+      y = (PREVIEW_HEIGHT - h) / 2.0;
+    }
+  *xp = RINT (x);
+  *yp = RINT (y);
+  *wid = RINT (w);
+  *heig = RINT (h);
+}
+
+/*************************************************/
+/* Check if the given position is within the     */
+/* light marker. Return TRUE if so, FALSE if not */
+/*************************************************/
+
+static gboolean
+check_handle_hit (gint xpos, gint ypos)
+{
+  gint dx,dy,r;
+  gint k = mapvals.light_selected;
+
+  dx = handle_xpos - xpos;
+  dy = handle_ypos - ypos;
+
+
+  if (mapvals.lightsource[k].type == POINT_LIGHT ||
+      mapvals.lightsource[k].type == DIRECTIONAL_LIGHT)
+    {
+      r = sqrt (dx * dx + dy * dy) + 0.5;
+      if ((gint) r > 7)
+        {
+          return (FALSE);
+        }
+      else
+        {
+          return (TRUE);
+        }
+    }
+  return FALSE;
+}
+
+/****************************************/
+/* Draw a light symbol                  */
+/****************************************/
+
+
+static void
+draw_handles (void)
+{
+  gdouble     dxpos, dypos;
+  gint        startx, starty, pw, ph;
+  GimpVector3 viewpoint;
+  GimpVector3 light_position;
+  gint        k      = mapvals.light_selected;
+
+  gfloat length;
+  gfloat delta_x = 0.0;
+  gfloat delta_y = 0.0;
+
+  /* calculate handle position */
+  compute_preview_rectangle (&startx, &starty, &pw, &ph);
+  switch (mapvals.lightsource[k].type)
+    {
+    case NO_LIGHT:
+      return;
+    case POINT_LIGHT:
+    case SPOT_LIGHT:
+      /* swap z to reverse light position */
+      viewpoint = mapvals.viewpoint;
+      viewpoint.z = -viewpoint.z;
+      light_position = mapvals.lightsource[k].position;
+      gimp_vector_3d_to_2d (startx, starty, pw, ph, &dxpos, &dypos,
+                            &viewpoint, &light_position);
+      handle_xpos = (gint) (dxpos + 0.5);
+      handle_ypos = (gint) (dypos + 0.5);
+      break;
+    case DIRECTIONAL_LIGHT:
+      light_position.x = light_position.y = 0.5;
+      light_position.z = 0;
+      viewpoint.z = -viewpoint.z;
+      gimp_vector_3d_to_2d (startx, starty, pw, ph, &dxpos, &dypos,
+                            &viewpoint, &light_position);
+      length = PREVIEW_HEIGHT / 4;
+      delta_x = mapvals.lightsource[k].direction.x * length;
+      delta_y = mapvals.lightsource[k].direction.y * length;
+      handle_xpos = dxpos + delta_x;
+      handle_ypos = dypos + delta_y;
+      break;
+    }
+
+  if (mapvals.lightsource[k].type != NO_LIGHT)
+    {
+      GdkColor  color;
+      cairo_t *cr;
+      cr = gdk_cairo_create (gtk_widget_get_window (previewarea));
+
+      cairo_set_line_width (cr, 1.0);
+
+      color.red   = 0x0;
+      color.green = 0x4000;
+      color.blue  = 0xFFFF;
+      gdk_cairo_set_source_color (cr, &color);
+
+      /* draw circle at light position */
+      switch (mapvals.lightsource[k].type)
+        {
+        case POINT_LIGHT:
+        case SPOT_LIGHT:
+          cairo_arc (cr, handle_xpos, handle_ypos,
+                     LIGHT_SYMBOL_SIZE/2, 0, 2 * G_PI);
+          cairo_fill (cr);
+          break;
+        case DIRECTIONAL_LIGHT:
+          cairo_arc (cr, handle_xpos, handle_ypos,
+                     LIGHT_SYMBOL_SIZE/2, 0, 2 * G_PI);
+          cairo_fill (cr);
+          cairo_move_to (cr, handle_xpos, handle_ypos);
+          cairo_line_to (cr, startx + pw/2, starty + ph/2);
+          cairo_stroke (cr);
+          break;
+        case NO_LIGHT:
+          break;
+        }
+      cairo_destroy (cr);
+    }
+}
+
+
+/*************************************************/
+/* Update light position given new screen coords */
+/*************************************************/
+
+void
+update_light (gint xpos, gint ypos)
+{
+  gint startx, starty, pw, ph;
+  GimpVector3  vp;
+  gint         k = mapvals.light_selected;
+
+  compute_preview_rectangle (&startx, &starty, &pw, &ph);
+
+  vp = mapvals.viewpoint;
+  vp.z = -vp.z;
+
+  switch (mapvals.lightsource[k].type)
+    {
+    case        NO_LIGHT:
+      break;
+    case        POINT_LIGHT:
+    case        SPOT_LIGHT:
+      gimp_vector_2d_to_3d (startx,
+                            starty,
+                            pw,
+                            ph,
+                            xpos, ypos, &vp, &mapvals.lightsource[k].position);
+      break;
+    case DIRECTIONAL_LIGHT:
+      gimp_vector_2d_to_3d (startx,
+                            starty,
+                            pw,
+                            ph,
+                            xpos, ypos, &vp, &mapvals.lightsource[k].direction);
+      break;
+    }
+}
+
+
+/******************************************************************/
+/* Draw preview image. if DoCompute is TRUE then recompute image. */
+/******************************************************************/
+
+void
+preview_compute (void)
+{
+  GdkDisplay *display = gtk_widget_get_display (previewarea);
+  GdkCursor  *cursor;
+  gint        startx, starty, pw, ph;
+
+  compute_preview_rectangle (&startx, &starty, &pw, &ph);
+
+  cursor = gdk_cursor_new_for_display (display, GDK_WATCH);
+
+  gdk_window_set_cursor (gtk_widget_get_window (previewarea), cursor);
+  gdk_cursor_unref (cursor);
+
+  compute_preview (startx, starty, pw, ph);
+  cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
+  gdk_window_set_cursor (gtk_widget_get_window (previewarea), cursor);
+  gdk_cursor_unref (cursor);
+  gdk_flush ();
+}
+
+
+/******************************/
+/* Preview area event handler */
+/******************************/
+
+gboolean
+preview_events (GtkWidget *area,
+                GdkEvent  *event)
+{
+  switch (event->type)
+    {
+    case GDK_ENTER_NOTIFY:
+      break;
+    case GDK_LEAVE_NOTIFY:
+      break;
+    case GDK_BUTTON_PRESS:
+      light_hit = check_handle_hit (event->button.x, event->button.y);
+      left_button_pressed = TRUE;
+      break;
+    case GDK_BUTTON_RELEASE:
+      left_button_pressed = FALSE;
+      break;
+    case GDK_MOTION_NOTIFY:
+      if (left_button_pressed == TRUE &&
+          light_hit == TRUE &&
+          mapvals.interactive_preview == TRUE )
+        {
+          gtk_widget_queue_draw (previewarea);
+          interactive_preview_callback(NULL);
+          update_light (event->motion.x, event->motion.y);
+        }
+      break;
+    default:
+      break;
+    }
+
+  return FALSE;
+}
+
+gboolean
+preview_expose (GtkWidget *area,
+                GdkEventExpose *eevent)
+{
+  cairo_t *cr;
+
+  cr = gdk_cairo_create (eevent->window);
+
+  cairo_set_source_surface (cr, preview_surface, 0.0, 0.0);
+
+  cairo_paint (cr);
+
+  /* draw symbols if enabled in UI */
+  if (mapvals.interactive_preview)
+    {
+      draw_handles ();
+    }
+
+  cairo_destroy (cr);
+
+  return FALSE;
+}
+
+void
+interactive_preview_callback (GtkWidget *widget)
+{
+  if (preview_update_timer != 0)
+    g_source_remove (preview_update_timer);
+
+  preview_update_timer = g_timeout_add (100,
+                                        interactive_preview_timer_callback,
+                                        NULL);
+}
+
+static gboolean
+interactive_preview_timer_callback (gpointer data)
+{
+  gint k = mapvals.light_selected;
+
+  mapvals.update_enabled = FALSE;  /* disable apply_settings() */
+
+  gtk_spin_button_set_value (GTK_SPIN_BUTTON(spin_pos_x),
+                             mapvals.lightsource[k].position.x);
+  gtk_spin_button_set_value (GTK_SPIN_BUTTON(spin_pos_y),
+                             mapvals.lightsource[k].position.y);
+  gtk_spin_button_set_value (GTK_SPIN_BUTTON(spin_pos_z),
+                             mapvals.lightsource[k].position.z);
+  gtk_spin_button_set_value (GTK_SPIN_BUTTON(spin_dir_x),
+                             mapvals.lightsource[k].direction.x);
+  gtk_spin_button_set_value (GTK_SPIN_BUTTON(spin_dir_y),
+                             mapvals.lightsource[k].direction.y);
+  gtk_spin_button_set_value (GTK_SPIN_BUTTON(spin_dir_z),
+                             mapvals.lightsource[k].direction.z);
+
+  mapvals.update_enabled = TRUE;
+
+  preview_compute ();
+
+  gtk_widget_queue_draw (previewarea);
+
+  preview_update_timer = 0;
+
+  return FALSE;
+}
diff --git a/plug-ins/lighting/lighting-preview.h b/plug-ins/lighting/lighting-preview.h
new file mode 100644
index 0000000..881dacd
--- /dev/null
+++ b/plug-ins/lighting/lighting-preview.h
@@ -0,0 +1,38 @@
+/* Lighting Effects - A plug-in for GIMP
+ *
+ * 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/>.
+ */
+
+#ifndef __LIGHTING_PREVIEW_H__
+#define __LIGHTING_PREVIEW_H__
+
+#define PREVIEW_WIDTH  200
+#define PREVIEW_HEIGHT 200
+
+/* Externally visible variables */
+
+extern gdouble    *xpostab, *ypostab;
+
+/* Externally visible functions */
+
+void     preview_compute              (void);
+void     interactive_preview_callback (GtkWidget *widget);
+gboolean preview_events               (GtkWidget *area,
+                                       GdkEvent  *event);
+gboolean preview_expose               (GtkWidget *area,
+                                       GdkEventExpose *eevent);
+void     update_light                 (gint       xpos,
+                                       gint       ypos);
+
+#endif  /* __LIGHTING_PREVIEW_H__ */
diff --git a/plug-ins/lighting/lighting-shade.c b/plug-ins/lighting/lighting-shade.c
new file mode 100644
index 0000000..70443d9
--- /dev/null
+++ b/plug-ins/lighting/lighting-shade.c
@@ -0,0 +1,838 @@
+/*****************/
+/* Shading stuff */
+/*****************/
+
+#include "config.h"
+
+#include <libgimp/gimp.h>
+
+#include "lighting-main.h"
+#include "lighting-image.h"
+#include "lighting-shade.h"
+
+
+static GimpVector3 *triangle_normals[2] = { NULL, NULL };
+static GimpVector3 *vertex_normals[3]   = { NULL, NULL, NULL };
+static gdouble     *heights[3] = { NULL, NULL, NULL };
+static gdouble      xstep, ystep;
+static guchar      *bumprow = NULL;
+
+static gint pre_w = -1;
+static gint pre_h = -1;
+
+/*****************/
+/* Phong shading */
+/*****************/
+
+static GimpRGB
+phong_shade (GimpVector3 *position,
+             GimpVector3 *viewpoint,
+             GimpVector3 *normal,
+             GimpVector3 *lightposition,
+             GimpRGB      *diff_col,
+             GimpRGB      *light_col,
+             LightType    light_type)
+{
+  GimpRGB       diffuse_color, specular_color;
+  gdouble      nl, rv, dist;
+  GimpVector3  l, v, n, lnormal, h;
+
+  /* Compute ambient intensity */
+  /* ========================= */
+
+  n = *normal;
+
+  /* Compute (N*L) term of Phong's equation */
+  /* ====================================== */
+
+  if (light_type == POINT_LIGHT)
+    gimp_vector3_sub (&l, lightposition, position);
+  else
+    {
+      l = *lightposition;
+      gimp_vector3_normalize (&l);
+    }
+
+  dist = gimp_vector3_length (&l);
+
+  if (dist != 0.0)
+    gimp_vector3_mul (&l, 1.0 / dist);
+
+  nl = MAX (0., 2.0 * gimp_vector3_inner_product (&n, &l));
+
+  lnormal = l;
+  gimp_vector3_normalize (&lnormal);
+
+  if (nl >= 0.0)
+    {
+      /* Compute (R*V)^alpha term of Phong's equation */
+      /* ============================================ */
+
+      gimp_vector3_sub (&v, viewpoint, position);
+      gimp_vector3_normalize (&v);
+
+      gimp_vector3_add (&h, &lnormal, &v);
+      gimp_vector3_normalize (&h);
+
+      rv = MAX (0.01, gimp_vector3_inner_product (&n, &h));
+      rv = pow (rv, mapvals.material.highlight);
+      rv *= nl;
+
+      /* Compute diffuse and specular intensity contribution */
+      /* =================================================== */
+
+      diffuse_color = *light_col;
+      gimp_rgb_multiply (&diffuse_color, mapvals.material.diffuse_int);
+      diffuse_color.r *= diff_col->r;
+      diffuse_color.g *= diff_col->g;
+      diffuse_color.b *= diff_col->b;
+      gimp_rgb_multiply (&diffuse_color, nl);
+
+      specular_color = *light_col;
+      if (mapvals.material.metallic)  /* for metals, specular color = diffuse color */
+        {
+          specular_color.r *= diff_col->r;
+          specular_color.g *= diff_col->g;
+          specular_color.b *= diff_col->b;
+        }
+      gimp_rgb_multiply (&specular_color, mapvals.material.specular_ref);
+      gimp_rgb_multiply (&specular_color, rv);
+
+      gimp_rgb_add (&diffuse_color, &specular_color);
+      gimp_rgb_clamp (&diffuse_color);
+    }
+
+  gimp_rgb_clamp (&diffuse_color);
+
+  return diffuse_color;
+}
+
+void
+precompute_init (gint w,
+                 gint h)
+{
+  gint n;
+  gint bpp=1;
+
+  xstep = 1.0 / (gdouble) width;
+  ystep = 1.0 / (gdouble) height;
+
+  pre_w = w;
+  pre_h = h;
+
+  for (n = 0; n < 3; n++)
+    {
+      if (vertex_normals[n] != NULL)
+        g_free (vertex_normals[n]);
+
+      if (heights[n] != NULL)
+        g_free (heights[n]);
+
+      heights[n]        = g_new (gdouble, w);
+      vertex_normals[n] = g_new (GimpVector3, w);
+    }
+
+  for (n = 0; n < 2; n++)
+    if (triangle_normals[n] != NULL)
+      g_free (triangle_normals[n]);
+
+  g_clear_pointer (&bumprow, g_free);
+
+  if (mapvals.bumpmap_id != -1)
+    {
+      bpp = gimp_drawable_bpp(mapvals.bumpmap_id);
+    }
+
+  bumprow = g_new (guchar, w * bpp);
+
+  triangle_normals[0] = g_new (GimpVector3, (w << 1) + 2);
+  triangle_normals[1] = g_new (GimpVector3, (w << 1) + 2);
+
+  for (n = 0; n < (w << 1) + 1; n++)
+    {
+      gimp_vector3_set (&triangle_normals[0][n], 0.0, 0.0, 1.0);
+      gimp_vector3_set (&triangle_normals[1][n], 0.0, 0.0, 1.0);
+    }
+
+  for (n = 0; n < w; n++)
+    {
+      gimp_vector3_set (&vertex_normals[0][n], 0.0, 0.0, 1.0);
+      gimp_vector3_set (&vertex_normals[1][n], 0.0, 0.0, 1.0);
+      gimp_vector3_set (&vertex_normals[2][n], 0.0, 0.0, 1.0);
+      heights[0][n] = 0.0;
+      heights[1][n] = 0.0;
+      heights[2][n] = 0.0;
+    }
+}
+
+
+/* Interpol linearly height[2] and triangle_normals[1]
+ * using the next row
+ */
+void
+interpol_row (gint x1,
+              gint x2,
+              gint y)
+{
+  GimpVector3  p1, p2, p3;
+  gint         n, i;
+  guchar      *map = NULL;
+  gint         bpp = 1;
+  guchar      *bumprow1 = NULL;
+  guchar      *bumprow2 = NULL;
+
+  if (mapvals.bumpmap_id != -1)
+    {
+      bumpmap_setup (mapvals.bumpmap_id);
+
+      bpp = babl_format_get_bytes_per_pixel (bump_format);
+    }
+
+  bumprow1 = g_new0 (guchar, pre_w * bpp);
+  bumprow2 = g_new0 (guchar, pre_w * bpp);
+
+  gegl_buffer_get (bump_buffer, GEGL_RECTANGLE (x1, y, x2 - x1, 1), 1.0,
+                   bump_format, bumprow1,
+                   GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+  gegl_buffer_get (bump_buffer, GEGL_RECTANGLE (x1, y - 1, x2 - x1, 1), 1.0,
+                   bump_format, bumprow2,
+                   GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+  if (mapvals.bumpmaptype > 0)
+    {
+      switch (mapvals.bumpmaptype)
+        {
+        case 1:
+          map = logmap;
+          break;
+        case 2:
+          map = sinemap;
+          break;
+        default:
+          map = spheremap;
+          break;
+        }
+    }
+
+  for (n = 0; n < (x2 - x1); n++)
+    {
+      gdouble diff;
+      guchar  mapval;
+      guchar  mapval1, mapval2;
+
+      if (bpp>1)
+        {
+          mapval1 = (guchar)((float)((bumprow1[n * bpp] +bumprow1[n * bpp +1] + bumprow1[n * bpp + 2])/3.0 )) ;
+          mapval2 = (guchar)((float)((bumprow2[n * bpp] +bumprow2[n * bpp +1] + bumprow2[n * bpp + 2])/3.0 )) ;
+        }
+      else
+        {
+          mapval1 = bumprow1[n * bpp];
+          mapval2 = bumprow2[n * bpp];
+        }
+
+      diff =  mapval1 - mapval2;
+      mapval = (guchar) CLAMP (mapval1 + diff, 0.0, 255.0);
+
+      if (mapvals.bumpmaptype > 0)
+        {
+          heights[1][n] = (gdouble) mapvals.bumpmax * (gdouble) map[mapval1] / 255.0;
+          heights[2][n] = (gdouble) mapvals.bumpmax * (gdouble) map[mapval] / 255.0;
+        }
+      else
+        {
+          heights[1][n] = (gdouble) mapvals.bumpmax * (gdouble) mapval1 / 255.0;
+          heights[2][n] = (gdouble) mapvals.bumpmax * (gdouble) mapval / 255.0;
+        }
+    }
+
+  i = 0;
+  for (n = 0; n < (x2 - x1 - 1); n++)
+    {
+      /* heights rows 1 and 2 are inverted */
+      p1.x = 0.0;
+      p1.y = ystep;
+      p1.z = heights[1][n] - heights[2][n];
+
+      p2.x = xstep;
+      p2.y = ystep;
+      p2.z = heights[1][n+1] - heights[2][n];
+
+      p3.x = xstep;
+      p3.y = 0.0;
+      p3.z = heights[2][n+1] - heights[2][n];
+
+      triangle_normals[1][i] = gimp_vector3_cross_product (&p2, &p1);
+      triangle_normals[1][i+1] = gimp_vector3_cross_product (&p3, &p2);
+
+      gimp_vector3_normalize (&triangle_normals[1][i]);
+      gimp_vector3_normalize (&triangle_normals[1][i+1]);
+
+      i += 2;
+    }
+
+  g_free (bumprow1);
+  g_free (bumprow2);
+}
+
+/********************************************/
+/* Compute triangle and then vertex normals */
+/********************************************/
+
+
+void
+precompute_normals (gint x1,
+                    gint x2,
+                    gint y)
+{
+  GimpVector3 *tmpv, p1, p2, p3, normal;
+  gdouble     *tmpd;
+  gint         n, i, nv;
+  guchar      *map = NULL;
+  gint         bpp = 1;
+  guchar       mapval;
+
+
+  /* First, compute the heights */
+  /* ========================== */
+
+  tmpv                = triangle_normals[0];
+  triangle_normals[0] = triangle_normals[1];
+  triangle_normals[1] = tmpv;
+
+  tmpv              = vertex_normals[0];
+  vertex_normals[0] = vertex_normals[1];
+  vertex_normals[1] = vertex_normals[2];
+  vertex_normals[2] = tmpv;
+
+  tmpd       = heights[0];
+  heights[0] = heights[1];
+  heights[1] = heights[2];
+  heights[2] = tmpd;
+
+  if (mapvals.bumpmap_id != -1)
+    {
+      bumpmap_setup (mapvals.bumpmap_id);
+
+      bpp = babl_format_get_bytes_per_pixel (bump_format);
+    }
+
+  gegl_buffer_get (bump_buffer, GEGL_RECTANGLE (x1, y, x2 - x1, 1), 1.0,
+                   bump_format, bumprow,
+                   GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+  if (mapvals.bumpmaptype > 0)
+    {
+      switch (mapvals.bumpmaptype)
+        {
+          case 1:
+            map = logmap;
+            break;
+          case 2:
+            map = sinemap;
+            break;
+          default:
+            map = spheremap;
+            break;
+        }
+
+      for (n = 0; n < (x2 - x1); n++)
+        {
+          if (bpp > 1)
+            {
+              mapval = (guchar)((float)((bumprow[n * bpp + 0] +
+                                         bumprow[n * bpp + 1] +
+                                         bumprow[n * bpp + 2])  /3.0));
+            }
+          else
+            {
+              mapval = bumprow[n * bpp];
+            }
+
+          heights[2][n] = (gdouble) mapvals.bumpmax * (gdouble) map[mapval] / 255.0;
+        }
+    }
+  else
+    {
+      for (n = 0; n < (x2 - x1); n++)
+        {
+          if (bpp>1)
+            {
+              mapval = (guchar)((float)((bumprow[n * bpp + 0] +
+                                         bumprow[n * bpp + 1] +
+                                         bumprow[n * bpp + 2]) / 3.0));
+            }
+          else
+            {
+              mapval = bumprow[n * bpp];
+            }
+
+          heights[2][n] = (gdouble) mapvals.bumpmax * (gdouble) mapval / 255.0;
+        }
+    }
+
+  /* Compute triangle normals */
+  /* ======================== */
+
+  i = 0;
+  for (n = 0; n < (x2 - x1 - 1); n++)
+    {
+      p1.x = 0.0;
+      p1.y = ystep;
+      p1.z = heights[2][n] - heights[1][n];
+
+      p2.x = xstep;
+      p2.y = ystep;
+      p2.z = heights[2][n+1] - heights[1][n];
+
+      p3.x = xstep;
+      p3.y = 0.0;
+      p3.z = heights[1][n+1] - heights[1][n];
+
+      triangle_normals[1][i] = gimp_vector3_cross_product (&p2, &p1);
+      triangle_normals[1][i+1] = gimp_vector3_cross_product (&p3, &p2);
+
+      gimp_vector3_normalize (&triangle_normals[1][i]);
+      gimp_vector3_normalize (&triangle_normals[1][i+1]);
+
+      i += 2;
+    }
+
+  /* Compute vertex normals */
+  /* ====================== */
+
+  i = 0;
+  gimp_vector3_set (&normal, 0.0, 0.0, 0.0);
+
+  for (n = 0; n < (x2 - x1 - 1); n++)
+    {
+      nv = 0;
+
+      if (n > 0)
+        {
+          if (y > 0)
+            {
+              gimp_vector3_add (&normal, &normal, &triangle_normals[0][i-1]);
+              gimp_vector3_add (&normal, &normal, &triangle_normals[0][i-2]);
+              nv += 2;
+            }
+
+          if (y < pre_h)
+            {
+              gimp_vector3_add (&normal, &normal, &triangle_normals[1][i-1]);
+              nv++;
+            }
+        }
+
+      if (n <pre_w)
+        {
+          if (y > 0)
+            {
+              gimp_vector3_add (&normal, &normal, &triangle_normals[0][i]);
+              gimp_vector3_add (&normal, &normal, &triangle_normals[0][i+1]);
+              nv += 2;
+            }
+
+          if (y < pre_h)
+            {
+              gimp_vector3_add (&normal, &normal, &triangle_normals[1][i]);
+              gimp_vector3_add (&normal, &normal, &triangle_normals[1][i+1]);
+              nv += 2;
+            }
+        }
+
+      gimp_vector3_mul (&normal, 1.0 / (gdouble) nv);
+      gimp_vector3_normalize (&normal);
+      vertex_normals[1][n] = normal;
+
+      i += 2;
+    }
+}
+
+/***********************************************************************/
+/* Compute the reflected ray given the normalized normal and ins. vec. */
+/***********************************************************************/
+
+static GimpVector3
+compute_reflected_ray (GimpVector3 *normal,
+                       GimpVector3 *view)
+{
+  GimpVector3 ref;
+  gdouble     nl;
+
+  nl = 2.0 * gimp_vector3_inner_product (normal, view);
+
+  ref = *normal;
+
+  gimp_vector3_mul (&ref, nl);
+  gimp_vector3_sub (&ref, &ref, view);
+
+  return ref;
+}
+
+/************************************************************************/
+/* Given the NorthPole, Equator and a third vector (normal) compute     */
+/* the conversion from spherical coordinates to image space coordinates */
+/************************************************************************/
+
+static void
+sphere_to_image (GimpVector3 *normal,
+                 gdouble     *u,
+                 gdouble     *v)
+{
+  static gdouble     alpha, fac;
+  static GimpVector3 cross_prod;
+  static GimpVector3 firstaxis  = { 1.0, 0.0, 0.0 };
+  static GimpVector3 secondaxis = { 0.0, 1.0, 0.0 };
+
+  alpha = acos (-gimp_vector3_inner_product (&secondaxis, normal));
+
+  *v = alpha / G_PI;
+
+  if (*v==0.0 || *v==1.0)
+    {
+      *u = 0.0;
+    }
+  else
+    {
+      fac = gimp_vector3_inner_product (&firstaxis, normal) / sin (alpha);
+
+      /* Make sure that we map to -1.0..1.0 (take care of rounding errors) */
+      /* ================================================================= */
+
+      if (fac>1.0)
+        fac = 1.0;
+      else if (fac<-1.0)
+        fac = -1.0;
+
+      *u = acos (fac) / (2.0 * G_PI);
+
+      cross_prod = gimp_vector3_cross_product (&secondaxis, &firstaxis);
+
+      if (gimp_vector3_inner_product (&cross_prod, normal) < 0.0)
+        *u = 1.0 - *u;
+    }
+}
+
+/*********************************************************************/
+/* These routines computes the color of the surface at a given point */
+/*********************************************************************/
+
+GimpRGB
+get_ray_color (GimpVector3 *position)
+{
+  GimpRGB       color;
+  GimpRGB       color_int;
+  GimpRGB       color_sum;
+  GimpRGB       light_color;
+  gint          x, f;
+  gdouble       xf, yf;
+  GimpVector3   normal, *p;
+  gint          k;
+
+  pos_to_float (position->x, position->y, &xf, &yf);
+
+  x = RINT (xf);
+
+  if (mapvals.transparent_background && heights[1][x] == 0)
+    {
+      gimp_rgb_set_alpha (&color_sum, 0.0);
+    }
+  else
+    {
+      color = get_image_color (xf, yf, &f);
+
+      color_sum = color;
+      gimp_rgb_multiply (&color_sum, mapvals.material.ambient_int);
+
+      for (k = 0; k < NUM_LIGHTS; k++)
+        {
+          if (!mapvals.lightsource[k].active
+              || mapvals.lightsource[k].type == NO_LIGHT)
+            continue;
+          else if (mapvals.lightsource[k].type == POINT_LIGHT)
+            p = &mapvals.lightsource[k].position;
+          else
+            p = &mapvals.lightsource[k].direction;
+
+          color_int = mapvals.lightsource[k].color;
+          gimp_rgb_multiply (&color_int, mapvals.lightsource[k].intensity);
+
+          if (mapvals.bump_mapped == FALSE || mapvals.bumpmap_id == -1)
+            {
+              light_color = phong_shade (position,
+                                         &mapvals.viewpoint,
+                                         &mapvals.planenormal,
+                                         p,
+                                         &color,
+                                         &color_int,
+                                         mapvals.lightsource[k].type);
+            }
+          else
+            {
+              normal = vertex_normals[1][(gint) RINT (xf)];
+
+              light_color = phong_shade (position,
+                                         &mapvals.viewpoint,
+                                         &normal,
+                                         p,
+                                         &color,
+                                         &color_int,
+                                         mapvals.lightsource[k].type);
+            }
+
+          gimp_rgb_add (&color_sum, &light_color);
+        }
+    }
+
+  gimp_rgb_clamp (&color_sum);
+  return color_sum;
+}
+
+GimpRGB
+get_ray_color_ref (GimpVector3 *position)
+{
+  GimpRGB      color_sum;
+  GimpRGB      color_int;
+  GimpRGB      light_color;
+  GimpRGB      color, env_color;
+  gint         x, f;
+  gdouble      xf, yf;
+  GimpVector3  normal, *p, v, r;
+  gint         k;
+  gdouble      tmpval;
+
+  pos_to_float (position->x, position->y, &xf, &yf);
+
+  x = RINT (xf);
+
+  if (mapvals.bump_mapped == FALSE || mapvals.bumpmap_id == -1)
+    normal = mapvals.planenormal;
+  else
+    normal = vertex_normals[1][(gint) RINT (xf)];
+  gimp_vector3_normalize (&normal);
+
+  if (mapvals.transparent_background && heights[1][x] == 0)
+    {
+      gimp_rgb_set_alpha (&color_sum, 0.0);
+    }
+  else
+    {
+      color = get_image_color (xf, yf, &f);
+      color_sum = color;
+      gimp_rgb_multiply (&color_sum, mapvals.material.ambient_int);
+
+      for (k = 0; k < NUM_LIGHTS; k++)
+        {
+          p = &mapvals.lightsource[k].direction;
+
+          if (!mapvals.lightsource[k].active
+              || mapvals.lightsource[k].type == NO_LIGHT)
+            continue;
+          else if (mapvals.lightsource[k].type == POINT_LIGHT)
+            p = &mapvals.lightsource[k].position;
+
+          color_int = mapvals.lightsource[k].color;
+          gimp_rgb_multiply (&color_int, mapvals.lightsource[k].intensity);
+
+          light_color = phong_shade (position,
+                                     &mapvals.viewpoint,
+                                     &normal,
+                                     p,
+                                     &color,
+                                     &color_int,
+                                     mapvals.lightsource[0].type);
+        }
+
+      gimp_vector3_sub (&v, &mapvals.viewpoint, position);
+      gimp_vector3_normalize (&v);
+
+      r = compute_reflected_ray (&normal, &v);
+
+      /* Get color in the direction of r */
+      /* =============================== */
+
+      sphere_to_image (&r, &xf, &yf);
+      env_color = peek_env_map (RINT (env_width * xf),
+                                RINT (env_height * yf));
+
+      tmpval = mapvals.material.diffuse_int;
+      mapvals.material.diffuse_int = 0.;
+
+      light_color = phong_shade (position,
+                                 &mapvals.viewpoint,
+                                 &normal,
+                                 &r,
+                                 &color,
+                                 &env_color,
+                                 DIRECTIONAL_LIGHT);
+
+      mapvals.material.diffuse_int = tmpval;
+
+      gimp_rgb_add (&color_sum, &light_color);
+    }
+
+  gimp_rgb_clamp (&color_sum);
+  return color_sum;
+}
+
+GimpRGB
+get_ray_color_no_bilinear (GimpVector3 *position)
+{
+  GimpRGB       color;
+  GimpRGB       color_int;
+  GimpRGB       color_sum;
+  GimpRGB       light_color;
+  gint          x;
+  gdouble       xf, yf;
+  GimpVector3   normal, *p;
+  gint          k;
+
+
+  pos_to_float (position->x, position->y, &xf, &yf);
+
+  x = RINT (xf);
+
+  if (mapvals.transparent_background && heights[1][x] == 0)
+    {
+      gimp_rgb_set_alpha (&color_sum, 0.0);
+    }
+  else
+    {
+      color = peek (x, RINT (yf));
+
+      color_sum = color;
+      gimp_rgb_multiply (&color_sum, mapvals.material.ambient_int);
+
+      for (k = 0; k < NUM_LIGHTS; k++)
+        {
+          p = &mapvals.lightsource[k].direction;
+
+          if (!mapvals.lightsource[k].active
+              || mapvals.lightsource[k].type == NO_LIGHT)
+            continue;
+          else if (mapvals.lightsource[k].type == POINT_LIGHT)
+            p = &mapvals.lightsource[k].position;
+
+          color_int = mapvals.lightsource[k].color;
+          gimp_rgb_multiply (&color_int, mapvals.lightsource[k].intensity);
+
+          if (mapvals.bump_mapped == FALSE || mapvals.bumpmap_id == -1)
+            {
+              light_color = phong_shade (position,
+                                         &mapvals.viewpoint,
+                                         &mapvals.planenormal,
+                                         p,
+                                         &color,
+                                         &color_int,
+                                         mapvals.lightsource[k].type);
+            }
+          else
+            {
+              normal = vertex_normals[1][x];
+
+              light_color = phong_shade (position,
+                                         &mapvals.viewpoint,
+                                         &normal,
+                                         p,
+                                         &color,
+                                         &color_int,
+                                         mapvals.lightsource[k].type);
+            }
+
+          gimp_rgb_add (&color_sum, &light_color);
+        }
+    }
+
+  gimp_rgb_clamp (&color_sum);
+  return color_sum;
+}
+
+GimpRGB
+get_ray_color_no_bilinear_ref (GimpVector3 *position)
+{
+  GimpRGB      color_sum;
+  GimpRGB      color_int;
+  GimpRGB      light_color;
+  GimpRGB      color, env_color;
+  gint         x;
+  gdouble      xf, yf;
+  GimpVector3  normal, *p, v, r;
+  gint         k;
+  gdouble      tmpval;
+
+  pos_to_float (position->x, position->y, &xf, &yf);
+
+  x = RINT (xf);
+
+  if (mapvals.bump_mapped == FALSE || mapvals.bumpmap_id == -1)
+    normal = mapvals.planenormal;
+  else
+    normal = vertex_normals[1][(gint) RINT (xf)];
+  gimp_vector3_normalize (&normal);
+
+  if (mapvals.transparent_background && heights[1][x] == 0)
+    {
+      gimp_rgb_set_alpha (&color_sum, 0.0);
+    }
+  else
+    {
+      color = peek (RINT (xf), RINT (yf));
+      color_sum = color;
+      gimp_rgb_multiply (&color_sum, mapvals.material.ambient_int);
+
+      for (k = 0; k < NUM_LIGHTS; k++)
+        {
+          p = &mapvals.lightsource[k].direction;
+
+          if (!mapvals.lightsource[k].active
+              || mapvals.lightsource[k].type == NO_LIGHT)
+            continue;
+          else if (mapvals.lightsource[k].type == POINT_LIGHT)
+            p = &mapvals.lightsource[k].position;
+
+          color_int = mapvals.lightsource[k].color;
+          gimp_rgb_multiply (&color_int, mapvals.lightsource[k].intensity);
+
+              light_color = phong_shade (position,
+                                         &mapvals.viewpoint,
+                                         &normal,
+                                         p,
+                                         &color,
+                                         &color_int,
+                                         mapvals.lightsource[0].type);
+        }
+
+      gimp_vector3_sub (&v, &mapvals.viewpoint, position);
+      gimp_vector3_normalize (&v);
+
+      r = compute_reflected_ray (&normal, &v);
+
+      /* Get color in the direction of r */
+      /* =============================== */
+
+      sphere_to_image (&r, &xf, &yf);
+      env_color = peek_env_map (RINT (env_width * xf),
+                                RINT (env_height * yf));
+
+      tmpval = mapvals.material.diffuse_int;
+      mapvals.material.diffuse_int = 0.;
+
+      light_color = phong_shade (position,
+                                 &mapvals.viewpoint,
+                                 &normal,
+                                 &r,
+                                 &color,
+                                 &env_color,
+                                 DIRECTIONAL_LIGHT);
+
+      mapvals.material.diffuse_int = tmpval;
+
+      gimp_rgb_add (&color_sum, &light_color);
+    }
+
+ gimp_rgb_clamp (&color_sum);
+
+ return color_sum;
+}
diff --git a/plug-ins/lighting/lighting-shade.h b/plug-ins/lighting/lighting-shade.h
new file mode 100644
index 0000000..536df95
--- /dev/null
+++ b/plug-ins/lighting/lighting-shade.h
@@ -0,0 +1,20 @@
+#ifndef __LIGHTING_SHADE_H__
+#define __LIGHTING_SHADE_H__
+
+typedef GimpRGB (* get_ray_func) (GimpVector3 *vector);
+
+GimpRGB get_ray_color                 (GimpVector3 *position);
+GimpRGB get_ray_color_no_bilinear     (GimpVector3 *position);
+GimpRGB get_ray_color_ref             (GimpVector3 *position);
+GimpRGB get_ray_color_no_bilinear_ref (GimpVector3 *position);
+
+void    precompute_init               (gint         w,
+				       gint         h);
+void    precompute_normals            (gint         x1,
+				       gint         x2,
+				       gint         y);
+void    interpol_row                  (gint         x1,
+                                       gint         x2,
+                                       gint         y);
+
+#endif  /* __LIGHTING_SHADE_H__ */
diff --git a/plug-ins/lighting/lighting-stock.c b/plug-ins/lighting/lighting-stock.c
new file mode 100644
index 0000000..0cc99b6
--- /dev/null
+++ b/plug-ins/lighting/lighting-stock.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * 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 "lighting-stock.h"
+
+#include "images/stock-pixbufs.h"
+
+
+static GtkIconFactory *lighting_icon_factory = NULL;
+
+static GtkStockItem lighting_stock_items[] =
+{
+  { STOCK_INTENSITY_AMBIENT_LOW,       NULL, 0, 0, NULL },
+  { STOCK_INTENSITY_AMBIENT_HIGH,      NULL, 0, 0, NULL },
+  { STOCK_INTENSITY_DIFFUSE_LOW,       NULL, 0, 0, NULL },
+  { STOCK_INTENSITY_DIFFUSE_HIGH,      NULL, 0, 0, NULL },
+  { STOCK_REFLECTIVITY_DIFFUSE_LOW,    NULL, 0, 0, NULL },
+  { STOCK_REFLECTIVITY_DIFFUSE_HIGH,   NULL, 0, 0, NULL },
+  { STOCK_REFLECTIVITY_SPECULAR_LOW,   NULL, 0, 0, NULL },
+  { STOCK_REFLECTIVITY_SPECULAR_HIGH,  NULL, 0, 0, NULL },
+  { STOCK_REFLECTIVITY_HIGHLIGHT_LOW,  NULL, 0, 0, NULL },
+  { STOCK_REFLECTIVITY_HIGHLIGHT_HIGH, NULL, 0, 0, NULL }
+};
+
+
+static void
+add_stock_icon (const gchar  *stock_id,
+                GtkIconSize   size,
+                const guint8 *inline_data)
+{
+  GtkIconSource *source;
+  GtkIconSet    *set;
+  GdkPixbuf     *pixbuf;
+
+  source = gtk_icon_source_new ();
+
+  gtk_icon_source_set_size (source, size);
+  gtk_icon_source_set_size_wildcarded (source, FALSE);
+
+  pixbuf = gdk_pixbuf_new_from_inline (-1, inline_data, FALSE, NULL);
+
+  gtk_icon_source_set_pixbuf (source, pixbuf);
+  g_object_unref (pixbuf);
+
+  set = gtk_icon_set_new ();
+
+  gtk_icon_set_add_source (set, source);
+  gtk_icon_source_free (source);
+
+  gtk_icon_factory_add (lighting_icon_factory, stock_id, set);
+
+  gtk_icon_set_unref (set);
+}
+
+void
+lighting_stock_init (void)
+{
+  static gboolean initialized = FALSE;
+
+  if (initialized)
+    return;
+
+  lighting_icon_factory = gtk_icon_factory_new ();
+
+  add_stock_icon (STOCK_INTENSITY_AMBIENT_LOW,       GTK_ICON_SIZE_BUTTON,
+                  stock_intensity_ambient_low);
+  add_stock_icon (STOCK_INTENSITY_AMBIENT_HIGH,      GTK_ICON_SIZE_BUTTON,
+                  stock_intensity_ambient_high);
+  add_stock_icon (STOCK_INTENSITY_DIFFUSE_LOW,       GTK_ICON_SIZE_BUTTON,
+                  stock_intensity_diffuse_low);
+  add_stock_icon (STOCK_INTENSITY_DIFFUSE_HIGH,      GTK_ICON_SIZE_BUTTON,
+                  stock_intensity_diffuse_high);
+  add_stock_icon (STOCK_REFLECTIVITY_DIFFUSE_LOW,    GTK_ICON_SIZE_BUTTON,
+                  stock_reflectivity_diffuse_low);
+  add_stock_icon (STOCK_REFLECTIVITY_DIFFUSE_HIGH,   GTK_ICON_SIZE_BUTTON,
+                  stock_reflectivity_diffuse_high);
+  add_stock_icon (STOCK_REFLECTIVITY_SPECULAR_LOW,   GTK_ICON_SIZE_BUTTON,
+                  stock_reflectivity_specular_low);
+  add_stock_icon (STOCK_REFLECTIVITY_SPECULAR_HIGH,  GTK_ICON_SIZE_BUTTON,
+                  stock_reflectivity_specular_high);
+  add_stock_icon (STOCK_REFLECTIVITY_HIGHLIGHT_LOW,  GTK_ICON_SIZE_BUTTON,
+                  stock_reflectivity_highlight_low);
+  add_stock_icon (STOCK_REFLECTIVITY_HIGHLIGHT_HIGH, GTK_ICON_SIZE_BUTTON,
+                  stock_reflectivity_highlight_high);
+
+  gtk_icon_factory_add_default (lighting_icon_factory);
+
+  gtk_stock_add_static (lighting_stock_items,
+                        G_N_ELEMENTS (lighting_stock_items));
+
+  initialized = TRUE;
+}
diff --git a/plug-ins/lighting/lighting-stock.h b/plug-ins/lighting/lighting-stock.h
new file mode 100644
index 0000000..6447526
--- /dev/null
+++ b/plug-ins/lighting/lighting-stock.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * 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/>.
+ */
+
+#ifndef __LIGHTING_STOCK_H__
+#define __LIGHTING_STOCK_H__
+
+
+#define STOCK_INTENSITY_AMBIENT_LOW        "intensity-ambient-low"
+#define STOCK_INTENSITY_AMBIENT_HIGH       "intensity-ambient-high"
+#define STOCK_INTENSITY_DIFFUSE_LOW        "intensity-diffuse-low"
+#define STOCK_INTENSITY_DIFFUSE_HIGH       "intensity-diffuse-high"
+#define STOCK_REFLECTIVITY_DIFFUSE_LOW     "reflectivity-diffuse-low"
+#define STOCK_REFLECTIVITY_DIFFUSE_HIGH    "reflectivity-diffuse-high"
+#define STOCK_REFLECTIVITY_SPECULAR_LOW    "reflectivity-specular-low"
+#define STOCK_REFLECTIVITY_SPECULAR_HIGH   "reflectivity-specular-high"
+#define STOCK_REFLECTIVITY_HIGHLIGHT_LOW   "reflectivity-highlight-low"
+#define STOCK_REFLECTIVITY_HIGHLIGHT_HIGH  "reflectivity-highlight-high"
+
+
+void  lighting_stock_init (void);
+
+
+#endif /* __LIGHTING_STOCK_H__ */
diff --git a/plug-ins/lighting/lighting-ui.c b/plug-ins/lighting/lighting-ui.c
new file mode 100644
index 0000000..86b4e12
--- /dev/null
+++ b/plug-ins/lighting/lighting-ui.c
@@ -0,0 +1,1557 @@
+/* Lighting Effects - A plug-in for GIMP
+ *
+ * Dialog creation and updaters, callbacks and event-handlers
+ *
+ * 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 <string.h>
+#include <errno.h>
+
+#include <glib/gstdio.h>
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+#include "lighting-ui.h"
+#include "lighting-main.h"
+#include "lighting-image.h"
+#include "lighting-apply.h"
+#include "lighting-preview.h"
+#include "lighting-stock.h"
+
+#include "libgimp/stdplugins-intl.h"
+
+
+extern LightingValues mapvals;
+
+static GtkWidget   *appwin            = NULL;
+static GtkNotebook *options_note_book = NULL;
+
+GtkWidget *previewarea                = NULL;
+
+GtkWidget *spin_pos_x                 = NULL;
+GtkWidget *spin_pos_y                 = NULL;
+GtkWidget *spin_pos_z                 = NULL;
+GtkWidget *spin_dir_x                 = NULL;
+GtkWidget *spin_dir_y                 = NULL;
+GtkWidget *spin_dir_z                 = NULL;
+
+static GtkWidget *colorbutton;
+static GtkWidget *light_type_combo;
+static GtkWidget *lightselect_combo;
+static GtkWidget *spin_intensity;
+static GtkWidget *isolate_button;
+static gchar     *lighting_effects_path = NULL;
+
+static void create_main_notebook      (GtkWidget       *container);
+
+static void toggle_update             (GtkWidget       *widget,
+                                       gpointer         data);
+
+static void     distance_update       (GtkAdjustment   *adj,
+                                       gpointer         data);
+
+static gboolean  bumpmap_constrain    (gint32           image_id,
+                                       gint32           drawable_id,
+                                       gpointer         data);
+static gboolean  envmap_constrain     (gint32           image_id,
+                                       gint32           drawable_id,
+                                       gpointer         data);
+static void     envmap_combo_callback (GtkWidget       *widget,
+                                       gpointer         data);
+static void     save_lighting_preset  (GtkWidget       *widget,
+                                       gpointer         data);
+static void     save_preset_response  (GtkFileChooser  *chooser,
+                                       gint             response_id,
+                                       gpointer         data);
+static void     load_lighting_preset  (GtkWidget       *widget,
+                                       gpointer         data);
+static void     load_preset_response  (GtkFileChooser  *chooser,
+                                       gint             response_id,
+                                       gpointer         data);
+static void     lightselect_callback  (GimpIntComboBox *combo,
+                                       gpointer         data);
+static void     apply_settings        (GtkWidget       *widget,
+                                       gpointer         data);
+static void     isolate_selected_light (GtkWidget      *widget,
+                                        gpointer        data);
+
+static GtkWidget * spin_button_new     (GtkAdjustment **adjustment,  /* return value */
+                                        gdouble         value,
+                                        gdouble         lower,
+                                        gdouble         upper,
+                                        gdouble         step_increment,
+                                        gdouble         page_increment,
+                                        gdouble         page_size,
+                                        gdouble         climb_rate,
+                                        guint           digits);
+
+/**********************/
+/* Std. toggle update */
+/**********************/
+
+static void
+toggle_update (GtkWidget *widget,
+               gpointer   data)
+{
+  gimp_toggle_button_update (widget, data);
+
+  preview_compute ();
+  gtk_widget_queue_draw (previewarea);
+}
+
+
+static void
+distance_update (GtkAdjustment *adj,
+                 gpointer   data)
+{
+  mapvals.viewpoint.z = gtk_adjustment_get_value (adj);
+
+  preview_compute ();
+  gtk_widget_queue_draw (previewarea);
+}
+
+
+/*****************************************/
+/* Main window light type menu callback. */
+/*****************************************/
+
+static void
+apply_settings (GtkWidget *widget,
+                gpointer   data)
+{
+  gint valid;
+  gint type;
+  gint k    = mapvals.light_selected;
+
+  if (mapvals.update_enabled)
+    {
+      valid = gimp_int_combo_box_get_active (GIMP_INT_COMBO_BOX (light_type_combo),
+                                             &type);
+      if (valid)
+        mapvals.lightsource[k].type = type;
+
+      gimp_color_button_get_color (GIMP_COLOR_BUTTON (colorbutton),
+                                   &mapvals.lightsource[k].color);
+
+      mapvals.lightsource[k].position.x
+        = gtk_spin_button_get_value (GTK_SPIN_BUTTON(spin_pos_x));
+      mapvals.lightsource[k].position.y
+        = gtk_spin_button_get_value (GTK_SPIN_BUTTON(spin_pos_y));
+      mapvals.lightsource[k].position.z
+        = gtk_spin_button_get_value (GTK_SPIN_BUTTON(spin_pos_z));
+
+      mapvals.lightsource[k].direction.x
+        = gtk_spin_button_get_value (GTK_SPIN_BUTTON(spin_dir_x));
+      mapvals.lightsource[k].direction.y
+        = gtk_spin_button_get_value (GTK_SPIN_BUTTON(spin_dir_y));
+      mapvals.lightsource[k].direction.z
+        = gtk_spin_button_get_value (GTK_SPIN_BUTTON(spin_dir_z));
+
+      mapvals.lightsource[k].intensity
+        = gtk_spin_button_get_value (GTK_SPIN_BUTTON(spin_intensity));
+
+      interactive_preview_callback(NULL);
+    }
+
+  if (widget == light_type_combo)
+    {
+      switch (mapvals.lightsource[k].type)
+        {
+        case NO_LIGHT:
+          gtk_widget_set_sensitive (spin_pos_x, FALSE);
+          gtk_widget_set_sensitive (spin_pos_y, FALSE);
+          gtk_widget_set_sensitive (spin_pos_z, FALSE);
+          gtk_widget_set_sensitive (spin_dir_x, FALSE);
+          gtk_widget_set_sensitive (spin_dir_y, FALSE);
+          gtk_widget_set_sensitive (spin_dir_z, FALSE);
+          break;
+        case POINT_LIGHT:
+          gtk_widget_set_sensitive (spin_pos_x, TRUE);
+          gtk_widget_set_sensitive (spin_pos_y, TRUE);
+          gtk_widget_set_sensitive (spin_pos_z, TRUE);
+          gtk_widget_set_sensitive (spin_dir_x, FALSE);
+          gtk_widget_set_sensitive (spin_dir_y, FALSE);
+          gtk_widget_set_sensitive (spin_dir_z, FALSE);
+          break;
+        case DIRECTIONAL_LIGHT:
+          gtk_widget_set_sensitive (spin_pos_x, FALSE);
+          gtk_widget_set_sensitive (spin_pos_y, FALSE);
+          gtk_widget_set_sensitive (spin_pos_z, FALSE);
+          gtk_widget_set_sensitive (spin_dir_x, TRUE);
+          gtk_widget_set_sensitive (spin_dir_y, TRUE);
+          gtk_widget_set_sensitive (spin_dir_z, TRUE);
+          break;
+        default:
+          break;
+        }
+    }
+}
+
+static void
+mapmenu2_callback (GtkWidget *widget,
+                   gpointer   data)
+{
+  gimp_int_combo_box_get_active (GIMP_INT_COMBO_BOX (widget), (gint *) data);
+
+  preview_compute ();
+  gtk_widget_queue_draw (previewarea);
+}
+
+/******************************************/
+/* Main window "Preview!" button callback */
+/******************************************/
+
+static void
+preview_callback (GtkWidget *widget)
+{
+  preview_compute ();
+  gtk_widget_queue_draw (previewarea);
+}
+
+
+
+
+/*********************************************/
+/* Main window "-" (zoom in) button callback */
+/*********************************************/
+/*
+static void
+zoomout_callback (GtkWidget *widget)
+{
+  mapvals.preview_zoom_factor *= 0.5;
+  draw_preview_image (TRUE);
+}
+*/
+/*********************************************/
+/* Main window "+" (zoom out) button callback */
+/*********************************************/
+/*
+static void
+zoomin_callback (GtkWidget *widget)
+{
+  mapvals.preview_zoom_factor *= 2.0;
+  draw_preview_image (TRUE);
+}
+*/
+/**********************************************/
+/* Main window "Apply" button callback.       */
+/* Render to GIMP image, close down and exit. */
+/**********************************************/
+
+static gint
+bumpmap_constrain (gint32   image_id,
+                   gint32   drawable_id,
+                   gpointer data)
+{
+  return  ((gimp_drawable_width (drawable_id) ==
+            gimp_drawable_width (mapvals.drawable_id)) &&
+           (gimp_drawable_height (drawable_id) ==
+            gimp_drawable_height (mapvals.drawable_id)));
+}
+
+static gint
+envmap_constrain (gint32   image_id,
+                  gint32   drawable_id,
+                  gpointer data)
+{
+  return (!gimp_drawable_is_gray (drawable_id) &&
+          !gimp_drawable_has_alpha (drawable_id));
+}
+
+static void
+envmap_combo_callback (GtkWidget *widget,
+                       gpointer   data)
+{
+  gimp_int_combo_box_get_active (GIMP_INT_COMBO_BOX (widget),
+                                 &mapvals.envmap_id);
+
+  env_width = gimp_drawable_width   (mapvals.envmap_id);
+  env_height = gimp_drawable_height (mapvals.envmap_id);
+}
+
+/***********************/
+/* Dialog constructors */
+/***********************/
+
+static GtkWidget *
+create_options_page (void)
+{
+  GtkWidget     *page;
+  GtkWidget     *frame;
+  GtkWidget     *vbox;
+  GtkWidget     *toggle;
+  GtkWidget     *table;
+  GtkAdjustment *adj;
+
+  page = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+  gtk_container_set_border_width (GTK_CONTAINER (page), 12);
+
+  /* General options */
+
+  frame = gimp_frame_new (_("General Options"));
+  gtk_box_pack_start (GTK_BOX (page), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  toggle = gtk_check_button_new_with_mnemonic (_("T_ransparent background"));
+  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
+                                mapvals.transparent_background);
+  gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
+  g_signal_connect (toggle, "toggled",
+                    G_CALLBACK (toggle_update),
+                    &mapvals.transparent_background);
+  gtk_widget_show (toggle);
+
+  gimp_help_set_help_data (toggle,
+                           _("Make destination image transparent where bump "
+                             "height is zero"),NULL);
+
+  toggle = gtk_check_button_new_with_mnemonic (_("Cre_ate new image"));
+  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
+                                mapvals.create_new_image);
+  gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
+  g_signal_connect (toggle, "toggled",
+                    G_CALLBACK (gimp_toggle_button_update),
+                    &mapvals.create_new_image);
+  gtk_widget_show (toggle);
+
+  gimp_help_set_help_data (toggle,
+                           _("Create a new image when applying filter"), NULL);
+
+  toggle = gtk_check_button_new_with_mnemonic (_("High _quality preview"));
+  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
+                                mapvals.previewquality);
+  gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
+  g_signal_connect (toggle, "toggled",
+                    G_CALLBACK (toggle_update),
+                    &mapvals.previewquality);
+  gtk_widget_show (toggle);
+
+  gimp_help_set_help_data (toggle,
+                           _("Enable/disable high quality preview"), NULL);
+
+  table = gtk_table_new (1, 3, FALSE);
+  gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 12);
+  gtk_widget_show (table);
+
+  adj = (GtkAdjustment *)
+        gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
+                              _("Distance:"), 100, 6,
+                              mapvals.viewpoint.z,
+                              0.0, 2.0, 0.01, 0.05,
+                              3, TRUE, 0.0, 0.0,
+                              "Distance of observer from surface",
+                              "plug-in-lighting");
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (distance_update),
+                    NULL);
+
+  gtk_widget_show (page);
+
+  return page;
+}
+
+/******************************/
+/* Create light settings page */
+/******************************/
+
+static GtkWidget *
+create_light_page (void)
+{
+  GtkWidget     *page;
+  GtkWidget     *frame;
+  GtkWidget     *table;
+  GtkWidget     *button;
+  GtkAdjustment *adj;
+  GtkWidget     *label;
+  gint           k = mapvals.light_selected;
+
+  page = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+  gtk_container_set_border_width (GTK_CONTAINER (page), 12);
+
+  frame = gimp_frame_new (_("Light Settings"));
+  gtk_box_pack_start (GTK_BOX (page), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  table = gtk_table_new (8, 8, FALSE);
+  gtk_table_set_col_spacings (GTK_TABLE (table), 6);
+  gtk_table_set_row_spacings (GTK_TABLE (table), 6);
+  gtk_container_add (GTK_CONTAINER (frame), table);
+  gtk_widget_show (table);
+
+  gtk_table_set_col_spacing (GTK_TABLE (table), 1, 12);
+  gtk_table_set_col_spacing (GTK_TABLE (table), 3, 12);
+
+  lightselect_combo =  gimp_int_combo_box_new (_("Light 1"),        0,
+                                               _("Light 2"),        1,
+                                               _("Light 3"),        2,
+                                               _("Light 4"),        3,
+                                               _("Light 5"),        4,
+                                               _("Light 6"),        5,
+                                               NULL);
+  gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (lightselect_combo), k);
+  gtk_table_attach_defaults (GTK_TABLE (table), lightselect_combo, 0, 2, 0, 1);
+  g_signal_connect (lightselect_combo, "changed",
+                    G_CALLBACK (lightselect_callback), NULL);
+  gtk_widget_show (lightselect_combo);
+
+  /* row labels */
+  label = gtk_label_new (_("Type:"));
+  gtk_label_set_xalign (GTK_LABEL (label), 0.0);
+  gtk_table_attach_defaults (GTK_TABLE (table), label, 0, 1, 1, 2);
+  gtk_widget_show (label);
+
+  label = gtk_label_new (_("Color:"));
+  gtk_label_set_xalign (GTK_LABEL (label), 0.0);
+  gtk_table_attach_defaults (GTK_TABLE (table), label, 0, 1, 2, 3);
+  gtk_widget_show (label);
+
+  light_type_combo =
+    gimp_int_combo_box_new (C_("light-source", "None"), NO_LIGHT,
+                            _("Directional"),           DIRECTIONAL_LIGHT,
+                            _("Point"),                 POINT_LIGHT,
+                            /* _("Spot"),               SPOT_LIGHT, */
+                            NULL);
+  gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (light_type_combo),
+                                 mapvals.lightsource[k].type);
+  gtk_table_attach_defaults (GTK_TABLE (table), light_type_combo,
+                             1, 2, 1, 2);
+  gtk_widget_show (light_type_combo);
+
+  g_signal_connect (light_type_combo, "changed",
+                    G_CALLBACK (apply_settings),
+                    NULL);
+
+  gimp_help_set_help_data (light_type_combo,
+                           _("Type of light source to apply"), NULL);
+
+  colorbutton = gimp_color_button_new (_("Select lightsource color"),
+                                          64, 16,
+                                          &mapvals.lightsource[k].color,
+                                          GIMP_COLOR_AREA_FLAT);
+  gimp_color_button_set_update (GIMP_COLOR_BUTTON (colorbutton), TRUE);
+  gtk_widget_show (colorbutton);
+  gtk_table_attach_defaults (GTK_TABLE (table),
+                             colorbutton, 1, 2, 2, 3);
+
+  g_signal_connect (colorbutton, "color-changed",
+                    G_CALLBACK (apply_settings),
+                    NULL);
+
+  gimp_help_set_help_data (colorbutton,
+                           _("Set light source color"), NULL);
+
+
+  spin_intensity = spin_button_new (&adj,
+                                    mapvals.lightsource[k].intensity,
+                                    0.0, 100.0,
+                                    0.01, 0.1, 0.0, 0.0, 2);
+  gimp_table_attach_aligned (GTK_TABLE (table), 0, 3,
+                                 _("_Intensity:"), 0.0, 0.5,
+                                 spin_intensity, 1, TRUE);
+
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (apply_settings),
+                    NULL);
+
+  gimp_help_set_help_data (spin_intensity,
+                           _("Light intensity"), NULL);
+
+
+  label = gtk_label_new (_("Position"));
+  gtk_label_set_xalign (GTK_LABEL (label), 0.0);
+  gtk_table_attach_defaults (GTK_TABLE (table), label, 3, 4, 0, 1);
+  gtk_widget_show (label);
+
+  spin_pos_x = spin_button_new (&adj,
+                                mapvals.lightsource[k].position.x,
+                                -100.0, 100.0,
+                                0.1, 1.0, 0.0, 0.0, 2);
+  gimp_table_attach_aligned (GTK_TABLE (table), 2, 1,
+                                 _("_X:"), 0.0, 0.5,
+                                 spin_pos_x, 1, TRUE);
+
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (apply_settings),
+                    NULL);
+
+  gimp_help_set_help_data (spin_pos_x,
+                           _("Light source X position in XYZ space"), NULL);
+
+  spin_pos_y = spin_button_new (&adj,
+                                mapvals.lightsource[k].position.y,
+                                -100.0, 100.0,
+                                0.1, 1.0, 0.0, 0.0, 2);
+  gimp_table_attach_aligned (GTK_TABLE (table), 2, 2,
+                             _("_Y:"), 0.0, 0.5,
+                             spin_pos_y, 1, TRUE);
+
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (apply_settings),
+                    NULL);
+
+  gimp_help_set_help_data (spin_pos_y,
+                           _("Light source Y position in XYZ space"), NULL);
+
+  spin_pos_z = spin_button_new (&adj,
+                                mapvals.lightsource[k].position.z,
+                                -100.0, 100.0,
+                                0.1, 1.0, 0.0, 0.0, 2);
+  gimp_table_attach_aligned (GTK_TABLE (table), 2, 3,
+                             _("_Z:"), 0.0, 0.5,
+                             spin_pos_z, 1, TRUE);
+
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (apply_settings),
+                    NULL);
+
+  gimp_help_set_help_data (spin_pos_z,
+                           _("Light source Z position in XYZ space"), NULL);
+
+
+  label = gtk_label_new (_("Direction"));
+  gtk_label_set_xalign (GTK_LABEL (label), 0.0);
+  gtk_table_attach_defaults (GTK_TABLE (table), label, 5, 6, 0, 1);
+  gtk_widget_show (label);
+
+  spin_dir_x = spin_button_new (&adj,
+                                mapvals.lightsource[k].direction.x,
+                                -100.0, 100.0, 0.1, 1.0, 0.0, 0.0, 2);
+  gimp_table_attach_aligned (GTK_TABLE (table), 4, 1,
+                             _("X:"), 0.0, 0.5,
+                             spin_dir_x, 1, TRUE);
+
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (apply_settings),
+                    NULL);
+
+  gimp_help_set_help_data (spin_dir_x,
+                           _("Light source X direction in XYZ space"), NULL);
+
+  spin_dir_y = spin_button_new (&adj,
+                                mapvals.lightsource[k].direction.y,
+                                -100.0, 100.0, 0.1, 1.0, 0.0, 0.0, 2);
+  gimp_table_attach_aligned (GTK_TABLE (table), 4, 2,
+                             _("Y:"), 0.0, 0.5,
+                                 spin_dir_y, 1, TRUE);
+
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (apply_settings),
+                    NULL);
+
+  gimp_help_set_help_data (spin_dir_y,
+                           _("Light source Y direction in XYZ space"), NULL);
+
+  spin_dir_z = spin_button_new (&adj,
+                                mapvals.lightsource[k].direction.z,
+                                -100.0, 100.0, 0.1, 1.0, 0.0, 0.0, 2);
+  gimp_table_attach_aligned (GTK_TABLE (table), 4, 3,
+                             _("Z:"), 0.0, 0.5,
+                             spin_dir_z, 1, TRUE);
+
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (apply_settings),
+                    NULL);
+
+  gimp_help_set_help_data (spin_dir_z,
+                           _("Light source Z direction in XYZ space"),
+                           NULL);
+
+  isolate_button = gtk_check_button_new_with_mnemonic (_("I_solate"));
+  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (isolate_button),
+                                mapvals.light_isolated);
+  g_signal_connect (isolate_button, "toggled",
+                    G_CALLBACK (isolate_selected_light),
+                    NULL);
+  gtk_table_attach_defaults (GTK_TABLE (table), isolate_button, 0, 1, 5, 6);
+  gtk_widget_show (isolate_button);
+
+  label = gtk_label_new (_("Lighting preset:"));
+  gtk_label_set_xalign (GTK_LABEL (label), 1.0);
+  gtk_table_set_row_spacing (GTK_TABLE (table), 5, 12);
+  gtk_table_attach_defaults (GTK_TABLE (table), label, 0, 2, 6, 7);
+  gtk_widget_show (label);
+
+  button = gtk_button_new_with_mnemonic (_("_Save"));
+  gtk_table_attach_defaults (GTK_TABLE (table), button, 2, 4, 6, 7);
+  g_signal_connect (button, "clicked",
+                    G_CALLBACK (save_lighting_preset),
+                    NULL);
+  gtk_widget_show (button);
+
+  button = gtk_button_new_with_mnemonic (_("_Open"));
+  gtk_table_attach_defaults (GTK_TABLE (table), button, 4, 6, 6, 7);
+  g_signal_connect (button, "clicked",
+                    G_CALLBACK (load_lighting_preset),
+                    NULL);
+  gtk_widget_show (button);
+
+  gtk_widget_show (page);
+
+  return page;
+}
+
+/*********************************/
+/* Create material settings page */
+/*********************************/
+
+static GtkWidget *
+create_material_page (void)
+{
+  GtkSizeGroup  *group = gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);
+  GtkWidget     *page;
+  GtkWidget     *frame;
+  GtkWidget     *table;
+  GtkWidget     *label;
+  GtkWidget     *hbox;
+  GtkWidget     *spinbutton;
+  GtkWidget     *image;
+  GtkWidget     *button;
+  GtkAdjustment *adj;
+
+  page = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+  gtk_container_set_border_width (GTK_CONTAINER (page), 12);
+
+  frame = gimp_frame_new (_("Material Properties"));
+  gtk_box_pack_start (GTK_BOX (page), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
+  gtk_container_add (GTK_CONTAINER (frame), hbox);
+  gtk_widget_show (hbox);
+
+  table = gtk_table_new (5, 4, FALSE);
+  gtk_table_set_row_spacings (GTK_TABLE (table), 6);
+  gtk_box_pack_start (GTK_BOX (hbox), table, FALSE, FALSE, 0);
+  gtk_widget_show (table);
+
+  /* Ambient intensity */
+
+  image = gtk_image_new_from_stock (STOCK_INTENSITY_AMBIENT_LOW,
+                                    GTK_ICON_SIZE_BUTTON);
+  label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
+                                     _("_Glowing:"), 0.0, 0.5,
+                                     image, 1, FALSE);
+  gtk_size_group_add_widget (group, label);
+
+  spinbutton = spin_button_new (&adj, mapvals.material.ambient_int,
+                                0, G_MAXFLOAT, 0.01, 0.1, 0.0, 0.0, 2);
+  gtk_table_attach (GTK_TABLE (table), spinbutton, 2, 3, 0, 1,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+  gtk_widget_show (spinbutton);
+
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (gimp_double_adjustment_update),
+                    &mapvals.material.ambient_int);
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (interactive_preview_callback),
+                    NULL);
+
+  gtk_label_set_mnemonic_widget (GTK_LABEL (label), spinbutton);
+  gimp_help_set_help_data (spinbutton,
+                           _("Amount of original color to show where no "
+                             "direct light falls"), NULL);
+
+  image = gtk_image_new_from_stock (STOCK_INTENSITY_AMBIENT_HIGH,
+                                    GTK_ICON_SIZE_BUTTON);
+  gtk_table_attach (GTK_TABLE (table), image, 3, 4, 0, 1,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+  gtk_widget_show (image);
+
+  /* Diffuse intensity */
+
+  image = gtk_image_new_from_stock (STOCK_INTENSITY_DIFFUSE_LOW,
+                                    GTK_ICON_SIZE_BUTTON);
+  label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 1,
+                                     _("_Bright:"), 0.0, 0.5,
+                                     image, 1, FALSE);
+  gtk_size_group_add_widget (group, label);
+
+  spinbutton = spin_button_new (&adj, mapvals.material.diffuse_int,
+                                0, G_MAXFLOAT, 0.01, 0.1, 0.0, 0.0, 2);
+  gtk_table_attach (GTK_TABLE (table), spinbutton, 2, 3, 1, 2,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+  gtk_widget_show (spinbutton);
+
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (gimp_double_adjustment_update),
+                    &mapvals.material.diffuse_int);
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (interactive_preview_callback),
+                    NULL);
+
+  gtk_label_set_mnemonic_widget (GTK_LABEL (label), spinbutton);
+  gimp_help_set_help_data (spinbutton,
+                           _("Intensity of original color when lit by a light "
+                             "source"), NULL);
+
+  image = gtk_image_new_from_stock (STOCK_INTENSITY_DIFFUSE_HIGH,
+                                    GTK_ICON_SIZE_BUTTON);
+  gtk_table_attach (GTK_TABLE (table), image, 3, 4, 1, 2,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+  gtk_widget_show (image);
+
+  /* Specular reflection */
+
+  image = gtk_image_new_from_stock (STOCK_REFLECTIVITY_SPECULAR_LOW,
+                                    GTK_ICON_SIZE_BUTTON);
+  label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 2,
+                                     _("_Shiny:"), 0.0, 0.5,
+                                     image, 1, FALSE);
+  gtk_size_group_add_widget (group, label);
+
+  spinbutton = spin_button_new (&adj, mapvals.material.specular_ref,
+                                0, G_MAXFLOAT, 0.01, 0.1, 0.0, 0.0, 2);
+  gtk_table_attach (GTK_TABLE (table), spinbutton, 2, 3, 2, 3,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+  gtk_widget_show (spinbutton);
+
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (gimp_double_adjustment_update),
+                    &mapvals.material.specular_ref);
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (interactive_preview_callback),
+                    NULL);
+
+  gtk_label_set_mnemonic_widget (GTK_LABEL (label), spinbutton);
+  gimp_help_set_help_data (spinbutton,
+                           _("Controls how intense the highlights will be"),
+                           NULL);
+
+  image = gtk_image_new_from_stock (STOCK_REFLECTIVITY_SPECULAR_HIGH,
+                                    GTK_ICON_SIZE_BUTTON);
+  gtk_table_attach (GTK_TABLE (table), image, 3, 4, 2, 3,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+  gtk_widget_show (image);
+
+  /* Highlight */
+  image = gtk_image_new_from_stock (STOCK_REFLECTIVITY_HIGHLIGHT_LOW,
+                                    GTK_ICON_SIZE_BUTTON);
+  label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 3,
+                                     _("_Polished:"), 0.0, 0.5,
+                                     image, 1, FALSE);
+  gtk_size_group_add_widget (group, label);
+
+  spinbutton = spin_button_new (&adj, mapvals.material.highlight,
+                                0, G_MAXFLOAT, 0.01, 0.1, 0.0, 0.0, 2);
+  gtk_table_attach (GTK_TABLE (table), spinbutton, 2, 3, 3, 4,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+  gtk_widget_show (spinbutton);
+
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (gimp_double_adjustment_update),
+                    &mapvals.material.highlight);
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (interactive_preview_callback),
+                    NULL);
+
+  gtk_label_set_mnemonic_widget (GTK_LABEL (label), spinbutton);
+  gimp_help_set_help_data (spinbutton,
+                           _("Higher values makes the highlights more focused"),
+                           NULL);
+
+  image = gtk_image_new_from_stock (STOCK_REFLECTIVITY_HIGHLIGHT_HIGH,
+                                    GTK_ICON_SIZE_BUTTON);
+  gtk_table_attach (GTK_TABLE (table), image, 3, 4, 3, 4,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+  gtk_widget_show (image);
+
+  /* Metallic */
+  button = gtk_check_button_new_with_mnemonic (_("_Metallic"));
+  gtk_table_attach (GTK_TABLE (table), button, 0, 3, 4, 5,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+  gtk_widget_show (button);
+
+  g_signal_connect (button, "toggled",
+                    G_CALLBACK (gimp_toggle_button_update),
+                    &mapvals.material.metallic);
+  g_signal_connect (button, "toggled",
+                    G_CALLBACK (interactive_preview_callback),
+                    NULL);
+
+  gtk_widget_show (page);
+
+  return page;
+}
+
+/* Create Bump mapping page */
+
+static GtkWidget *
+create_bump_page (void)
+{
+  GtkWidget     *page;
+  GtkWidget     *toggle;
+  GtkWidget     *frame;
+  GtkWidget     *table;
+  GtkWidget     *combo;
+  GtkWidget     *spinbutton;
+  GtkAdjustment *adj;
+
+  page = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+  gtk_container_set_border_width (GTK_CONTAINER (page), 12);
+
+  frame = gimp_frame_new (NULL);
+  gtk_box_pack_start (GTK_BOX (page), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  toggle = gtk_check_button_new_with_mnemonic (_("E_nable bump mapping"));
+  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
+                                mapvals.bump_mapped);
+  gtk_frame_set_label_widget (GTK_FRAME (frame), toggle);
+  gtk_widget_show (toggle);
+
+  g_signal_connect (toggle, "toggled",
+                    G_CALLBACK (gimp_toggle_button_update),
+                    &mapvals.bump_mapped);
+  g_signal_connect (toggle, "toggled",
+                    G_CALLBACK (interactive_preview_callback),
+                    NULL);
+
+  gimp_help_set_help_data (toggle,
+                           _("Enable/disable bump-mapping (image depth)"),
+                           NULL);
+
+  table = gtk_table_new (6, 2, FALSE);
+  gtk_table_set_col_spacings (GTK_TABLE (table), 6);
+  gtk_table_set_row_spacings (GTK_TABLE (table), 6);
+  gtk_container_add (GTK_CONTAINER (frame), table);
+  gtk_widget_show (table);
+
+  g_object_bind_property (toggle, "active",
+                          table,  "sensitive",
+                          G_BINDING_SYNC_CREATE);
+
+  combo = gimp_drawable_combo_box_new (bumpmap_constrain, NULL);
+  gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo), mapvals.bumpmap_id,
+                              G_CALLBACK (gimp_int_combo_box_get_active),
+                              &mapvals.bumpmap_id);
+
+  g_signal_connect (combo, "changed",
+                    G_CALLBACK (mapmenu2_callback),
+                    &mapvals.bumpmap_id);
+
+  gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
+                             _("Bumpm_ap image:"), 0.0, 0.5,
+                             combo, 1, FALSE);
+
+  combo = gimp_int_combo_box_new (_("Linear"),      LINEAR_MAP,
+                                  _("Logarithmic"), LOGARITHMIC_MAP,
+                                  _("Sinusoidal"),  SINUSOIDAL_MAP,
+                                  _("Spherical"),   SPHERICAL_MAP,
+                                  NULL);
+  gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (combo),
+                                 mapvals.bumpmaptype);
+
+  g_signal_connect (combo, "changed",
+                    G_CALLBACK (mapmenu2_callback),
+                    &mapvals.bumpmaptype);
+
+  gimp_table_attach_aligned (GTK_TABLE (table), 0, 1,
+                             _("Cu_rve:"), 0.0, 0.5, combo, 1, FALSE);
+
+  spinbutton = spin_button_new (&adj, mapvals.bumpmax,
+                                0, G_MAXFLOAT, 0.01, 0.1, 0.0, 0.0, 2);
+  gimp_table_attach_aligned (GTK_TABLE (table), 0, 2,
+                             _("Ma_ximum height:"), 0.0, 0.5,
+                             spinbutton, 1, TRUE);
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (gimp_double_adjustment_update),
+                    &mapvals.bumpmax);
+  g_signal_connect (adj, "value-changed",
+                    G_CALLBACK (interactive_preview_callback),
+                    NULL);
+
+  gimp_help_set_help_data (spinbutton,
+                           _("Maximum height for bumps"),
+                           NULL);
+
+  gtk_widget_show (page);
+
+  return page;
+}
+
+static GtkWidget *
+create_environment_page (void)
+{
+  GtkWidget *page;
+  GtkWidget *toggle;
+  GtkWidget *table;
+  GtkWidget *frame;
+  GtkWidget *combo;
+
+  page = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+  gtk_container_set_border_width (GTK_CONTAINER (page), 12);
+
+  frame = gimp_frame_new (NULL);
+  gtk_box_pack_start (GTK_BOX (page), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  toggle = gtk_check_button_new_with_mnemonic (_("E_nable environment mapping"));
+  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
+                                mapvals.env_mapped);
+  gtk_frame_set_label_widget (GTK_FRAME (frame), toggle);
+  gtk_widget_show (toggle);
+
+  g_signal_connect (toggle, "toggled",
+                    G_CALLBACK (gimp_toggle_button_update),
+                    &mapvals.env_mapped);
+  g_signal_connect (toggle, "toggled",
+                    G_CALLBACK (interactive_preview_callback),
+                    NULL);
+
+  gimp_help_set_help_data (toggle,
+                           _("Enable/disable environment-mapping (reflection)"),
+                           NULL);
+
+  table = gtk_table_new (3, 2, FALSE);
+  gtk_table_set_col_spacings (GTK_TABLE (table), 6);
+  gtk_table_set_row_spacings (GTK_TABLE (table), 6);
+  gtk_container_add (GTK_CONTAINER (frame), table);
+  gtk_widget_show (table);
+
+  g_object_bind_property (toggle, "active",
+                          table,  "sensitive",
+                          G_BINDING_SYNC_CREATE);
+
+  combo = gimp_drawable_combo_box_new (envmap_constrain, NULL);
+  gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo), mapvals.envmap_id,
+                              G_CALLBACK (envmap_combo_callback),
+                              NULL);
+  gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
+                             _("En_vironment image:"), 0.0, 0.5,
+                             combo, 1, FALSE);
+
+  gimp_help_set_help_data (combo, _("Environment image to use"), NULL);
+
+  gtk_widget_show (page);
+
+  return page;
+}
+
+/*****************************/
+/* Create notebook and pages */
+/*****************************/
+
+static void
+create_main_notebook (GtkWidget *container)
+{
+  GtkWidget *page;
+
+  options_note_book = GTK_NOTEBOOK (gtk_notebook_new ());
+  gtk_container_add (GTK_CONTAINER (container),
+                     GTK_WIDGET (options_note_book));
+
+  page = create_options_page ();
+  gtk_notebook_append_page (options_note_book, page,
+                            gtk_label_new_with_mnemonic (_("Op_tions")));
+
+  page = create_light_page ();
+  gtk_notebook_append_page (options_note_book, page,
+                            gtk_label_new_with_mnemonic (_("_Light")));
+
+  page = create_material_page ();
+  gtk_notebook_append_page (options_note_book, page,
+                            gtk_label_new_with_mnemonic (_("_Material")));
+
+  page = create_bump_page ();
+  gtk_notebook_append_page (options_note_book, page,
+                            gtk_label_new_with_mnemonic (_("_Bump Map")));
+
+  page = create_environment_page ();
+  gtk_notebook_append_page (options_note_book, page,
+                            gtk_label_new_with_mnemonic (_("_Environment Map")));
+
+  /*
+  if (mapvals.bump_mapped == TRUE)
+    {
+      bump_page = create_bump_page ();
+      bump_page_pos = g_list_length (options_note_book->children);
+      gtk_notebook_append_page (options_note_book, bump_page,
+                                gtk_label_new (_("Bumpmap")));
+    }
+
+  if (mapvals.env_mapped == TRUE)
+    {
+      env_page = create_environment_page ();
+      env_page_pos = g_list_length (options_note_book->children);
+      gtk_notebook_append_page (options_note_book, env_page,
+                                gtk_label_new (_("Environment")));
+    }
+  */
+  gtk_widget_show (GTK_WIDGET (options_note_book));
+}
+
+/********************************/
+/* Create and show main dialog. */
+/********************************/
+
+gboolean
+main_dialog (gint32 drawable_id)
+{
+  GtkWidget *main_hbox;
+  GtkWidget *vbox;
+  GtkWidget *hbox;
+  GtkWidget *frame;
+  GtkWidget *button;
+  GtkWidget *toggle;
+  gchar     *path;
+  gboolean   run = FALSE;
+
+  /*
+  GtkWidget *image;
+  */
+
+  gimp_ui_init (PLUG_IN_BINARY, FALSE);
+
+  path = gimp_gimprc_query ("lighting-effects-path");
+  if (path)
+    {
+      lighting_effects_path = g_filename_from_utf8 (path, -1, NULL, NULL, NULL);
+      g_free (path);
+    }
+
+  lighting_stock_init ();
+
+  appwin = gimp_dialog_new (_("Lighting Effects"), PLUG_IN_ROLE,
+                            NULL, 0,
+                            gimp_standard_help_func, PLUG_IN_PROC,
+
+                            _("_Cancel"), GTK_RESPONSE_CANCEL,
+                            _("_OK"),     GTK_RESPONSE_OK,
+
+                            NULL);
+
+  gtk_dialog_set_alternative_button_order (GTK_DIALOG (appwin),
+                                           GTK_RESPONSE_OK,
+                                           GTK_RESPONSE_CANCEL,
+                                           -1);
+
+  gimp_window_set_transient (GTK_WINDOW (appwin));
+
+  main_hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 12);
+  gtk_container_set_border_width (GTK_CONTAINER (main_hbox), 12);
+  gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (appwin))),
+                      main_hbox, FALSE, FALSE, 0);
+  gtk_widget_show (main_hbox);
+
+  /* Create the Preview */
+  /* ================== */
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
+  gtk_box_pack_start (GTK_BOX (main_hbox), vbox, FALSE, FALSE, 0);
+  gtk_widget_show (vbox);
+
+  /* Add preview widget and various buttons to the first part */
+  /* ======================================================== */
+
+  frame = gtk_frame_new (NULL);
+  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
+  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  gtk_widget_realize (appwin);
+
+  previewarea = gtk_drawing_area_new ();
+  gtk_widget_set_size_request (previewarea, PREVIEW_WIDTH, PREVIEW_HEIGHT);
+  gtk_widget_set_events (previewarea, (GDK_EXPOSURE_MASK |
+                                       GDK_BUTTON1_MOTION_MASK |
+                                       GDK_BUTTON_PRESS_MASK |
+                                       GDK_BUTTON_RELEASE_MASK));
+  g_signal_connect (previewarea, "event",
+                    G_CALLBACK (preview_events),
+                    previewarea);
+  g_signal_connect (previewarea, "expose-event",
+                    G_CALLBACK (preview_expose),
+                    previewarea);
+  gtk_container_add (GTK_CONTAINER (frame), previewarea);
+  gtk_widget_show (previewarea);
+
+  /* create preview options, frame and vbox */
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  button = gtk_button_new_with_mnemonic (_("_Update"));
+  gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+  g_signal_connect (button, "clicked",
+                    G_CALLBACK (preview_callback),
+                    NULL);
+  gtk_widget_show (button);
+
+  gimp_help_set_help_data (button, _("Recompute preview image"), NULL);
+
+  toggle = gtk_check_button_new_with_mnemonic (_("I_nteractive"));
+  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
+                                mapvals.interactive_preview);
+  gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, TRUE, 0);
+  g_signal_connect (toggle, "toggled",
+                    G_CALLBACK (gimp_toggle_button_update),
+                    &mapvals.interactive_preview);
+  g_signal_connect (toggle, "toggled",
+                    G_CALLBACK (interactive_preview_callback),
+                    NULL);
+
+  gtk_widget_show (toggle);
+
+  gimp_help_set_help_data (toggle,
+                           _("Enable/disable real time preview of changes"),
+                           NULL);
+
+  create_main_notebook (main_hbox);
+
+  gtk_widget_show (appwin);
+
+  {
+    GdkCursor *cursor;
+
+    cursor = gdk_cursor_new_for_display (gtk_widget_get_display (previewarea),
+                                         GDK_HAND2);
+    gdk_window_set_cursor (gtk_widget_get_window (previewarea), cursor);
+    gdk_cursor_unref (cursor);
+  }
+
+  if (image_setup (drawable_id, TRUE))
+    preview_compute ();
+
+  if (gimp_dialog_run (GIMP_DIALOG (appwin)) == GTK_RESPONSE_OK)
+    run = TRUE;
+
+  if (preview_rgb_data != NULL)
+    g_free (preview_rgb_data);
+
+  if (preview_surface != NULL)
+    cairo_surface_destroy (preview_surface);
+
+  gtk_widget_destroy (appwin);
+
+  return run;
+}
+
+
+static void
+save_lighting_preset (GtkWidget *widget,
+                      gpointer   data)
+{
+  static GtkWidget *window = NULL;
+
+  if (! window)
+    {
+      window =
+        gtk_file_chooser_dialog_new (_("Save Lighting Preset"),
+                                     GTK_WINDOW (appwin),
+                                     GTK_FILE_CHOOSER_ACTION_SAVE,
+
+                                     _("_Cancel"), GTK_RESPONSE_CANCEL,
+                                     _("_Save"),   GTK_RESPONSE_OK,
+
+                                     NULL);
+
+      gtk_dialog_set_default_response (GTK_DIALOG (window), GTK_RESPONSE_OK);
+      gtk_dialog_set_alternative_button_order (GTK_DIALOG (window),
+                                               GTK_RESPONSE_OK,
+                                               GTK_RESPONSE_CANCEL,
+                                               -1);
+
+      gtk_file_chooser_set_do_overwrite_confirmation (GTK_FILE_CHOOSER (window),
+                                                      TRUE);
+
+      g_signal_connect (window, "destroy",
+                        G_CALLBACK (gtk_widget_destroyed),
+                        &window);
+      g_signal_connect (window, "response",
+                        G_CALLBACK (save_preset_response),
+                        NULL);
+    }
+
+  if (lighting_effects_path)
+    {
+      GList *list;
+      gchar *dir;
+
+      list = gimp_path_parse (lighting_effects_path, 256, FALSE, NULL);
+      dir = gimp_path_get_user_writable_dir (list);
+      gimp_path_free (list);
+
+      if (! dir)
+        dir = g_strdup (gimp_directory ());
+
+      gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (window), dir);
+
+      g_free (dir);
+    }
+  else
+    {
+      gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (window),
+                                           g_get_tmp_dir ());
+    }
+
+  gtk_window_present (GTK_WINDOW (window));
+}
+
+
+static void
+save_preset_response (GtkFileChooser *chooser,
+                      gint            response_id,
+                      gpointer        data)
+{
+  FILE          *fp;
+  gint           num_lights = 0;
+  gint           k;
+  LightSettings *source;
+  gchar          buffer1[G_ASCII_DTOSTR_BUF_SIZE];
+  gchar          buffer2[G_ASCII_DTOSTR_BUF_SIZE];
+  gchar          buffer3[G_ASCII_DTOSTR_BUF_SIZE];
+  gint           blen       = G_ASCII_DTOSTR_BUF_SIZE;
+
+  if (response_id == GTK_RESPONSE_OK)
+    {
+      gchar *filename = gtk_file_chooser_get_filename (chooser);
+
+      fp = g_fopen (filename, "wb");
+
+      if (!fp)
+        {
+          g_message (_("Could not open '%s' for writing: %s"),
+                     filename, g_strerror (errno));
+        }
+      else
+        {
+          for (k = 0; k < NUM_LIGHTS; k++)
+            if (mapvals.lightsource[k].type != NO_LIGHT)
+              ++num_lights;
+
+          fprintf (fp, "Number of lights: %d\n", num_lights);
+
+          for (k = 0; k < NUM_LIGHTS; k++)
+            if (mapvals.lightsource[k].type != NO_LIGHT)
+              {
+                source = &mapvals.lightsource[k];
+
+                switch (source->type)
+                  {
+                  case POINT_LIGHT:
+                    fprintf (fp, "Type: Point\n");
+                    break;
+                  case DIRECTIONAL_LIGHT:
+                    fprintf (fp, "Type: Directional\n");
+                    break;
+                  case SPOT_LIGHT:
+                    fprintf (fp, "Type: Spot\n");
+                    break;
+                  default:
+                    g_warning ("Unknown light type: %d",
+                               mapvals.lightsource[k].type);
+                    continue;
+                  }
+
+                fprintf (fp, "Position: %s %s %s\n",
+                         g_ascii_dtostr (buffer1, blen, source->position.x),
+                         g_ascii_dtostr (buffer2, blen, source->position.y),
+                         g_ascii_dtostr (buffer3, blen, source->position.z));
+
+                fprintf (fp, "Direction: %s %s %s\n",
+                         g_ascii_dtostr (buffer1, blen, source->direction.x),
+                         g_ascii_dtostr (buffer2, blen, source->direction.y),
+                         g_ascii_dtostr (buffer3, blen, source->direction.z));
+
+                fprintf (fp, "Color: %s %s %s\n",
+                         g_ascii_dtostr (buffer1, blen, source->color.r),
+                         g_ascii_dtostr (buffer2, blen, source->color.g),
+                         g_ascii_dtostr (buffer3, blen, source->color.b));
+
+                fprintf (fp, "Intensity: %s\n",
+                         g_ascii_dtostr (buffer1, blen, source->intensity));
+              }
+
+          fclose (fp);
+        }
+
+      g_free (filename);
+    }
+
+  gtk_widget_destroy (GTK_WIDGET (chooser));
+}
+
+static void
+load_lighting_preset (GtkWidget *widget,
+                      gpointer   data)
+{
+  static GtkWidget *window = NULL;
+
+  if (! window)
+    {
+      window =
+        gtk_file_chooser_dialog_new (_("Load Lighting Preset"),
+                                     GTK_WINDOW (appwin),
+                                     GTK_FILE_CHOOSER_ACTION_OPEN,
+
+                                     _("_Cancel"), GTK_RESPONSE_CANCEL,
+                                     _("_Open"),   GTK_RESPONSE_OK,
+
+                                     NULL);
+
+      gtk_dialog_set_default_response (GTK_DIALOG (window), GTK_RESPONSE_OK);
+      gtk_dialog_set_alternative_button_order (GTK_DIALOG (window),
+                                               GTK_RESPONSE_OK,
+                                               GTK_RESPONSE_CANCEL,
+                                               -1);
+
+      g_signal_connect (window, "destroy",
+                        G_CALLBACK (gtk_widget_destroyed),
+                        &window);
+      g_signal_connect (window, "response",
+                        G_CALLBACK (load_preset_response),
+                        NULL);
+    }
+
+  if (lighting_effects_path)
+    {
+      GList *list;
+      gchar *dir;
+
+      list = gimp_path_parse (lighting_effects_path, 256, FALSE, NULL);
+      dir = gimp_path_get_user_writable_dir (list);
+      gimp_path_free (list);
+
+      if (! dir)
+        dir = g_strdup (gimp_directory ());
+
+      gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (window), dir);
+
+      g_free (dir);
+    }
+  else
+    {
+      gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (window),
+                                           g_get_tmp_dir ());
+    }
+
+
+  gtk_window_present (GTK_WINDOW (window));
+}
+
+
+static void
+load_preset_response (GtkFileChooser *chooser,
+                      gint            response_id,
+                      gpointer        data)
+{
+  FILE          *fp;
+  gint           num_lights;
+  gint           k;
+  LightSettings *source;
+  gchar          buffer1[G_ASCII_DTOSTR_BUF_SIZE];
+  gchar          buffer2[G_ASCII_DTOSTR_BUF_SIZE];
+  gchar          buffer3[G_ASCII_DTOSTR_BUF_SIZE];
+  gchar          type_label[21];
+  gchar         *endptr;
+  gchar          fmt_str[32];
+
+  if (response_id == GTK_RESPONSE_OK)
+    {
+      gchar *filename = gtk_file_chooser_get_filename (chooser);
+
+      fp = g_fopen (filename, "rb");
+
+      if (!fp)
+        {
+          g_message (_("Could not open '%s' for reading: %s"),
+                     filename, g_strerror (errno));
+        }
+      else
+        {
+          fscanf (fp, "Number of lights: %d", &num_lights);
+
+          /* initialize lights to off */
+          for (k = 0; k < NUM_LIGHTS; k++)
+            mapvals.lightsource[k].type = NO_LIGHT;
+
+          for (k = 0; k < num_lights; k++)
+            {
+              source = &mapvals.lightsource[k];
+
+              fscanf (fp, " Type: %20s", type_label);
+
+              if (!strcmp (type_label, "Point"))
+                source->type = POINT_LIGHT;
+              else if (!strcmp (type_label, "Directional"))
+                source->type = DIRECTIONAL_LIGHT;
+              else if (!strcmp (type_label, "Spot"))
+                source->type = SPOT_LIGHT;
+              else
+                {
+                  g_warning ("Unknown light type: %s", type_label);
+                  fclose (fp);
+                  return;
+                }
+
+              snprintf (fmt_str, sizeof (fmt_str),
+                        " Position: %%%" G_GSIZE_FORMAT "s %%%" G_GSIZE_FORMAT "s %%%" G_GSIZE_FORMAT "s",
+                        sizeof (buffer1) - 1,
+                        sizeof (buffer2) - 1,
+                        sizeof (buffer3) - 1);
+              fscanf (fp, fmt_str, buffer1, buffer2, buffer3);
+              source->position.x = g_ascii_strtod (buffer1, &endptr);
+              source->position.y = g_ascii_strtod (buffer2, &endptr);
+              source->position.z = g_ascii_strtod (buffer3, &endptr);
+
+              snprintf (fmt_str, sizeof (fmt_str),
+                        " Direction: %%%" G_GSIZE_FORMAT "s %%%" G_GSIZE_FORMAT "s %%%" G_GSIZE_FORMAT "s",
+                        sizeof (buffer1) - 1,
+                        sizeof (buffer2) - 1,
+                        sizeof (buffer3) - 1);
+              fscanf (fp, fmt_str, buffer1, buffer2, buffer3);
+              source->direction.x = g_ascii_strtod (buffer1, &endptr);
+              source->direction.y = g_ascii_strtod (buffer2, &endptr);
+              source->direction.z = g_ascii_strtod (buffer3, &endptr);
+
+              snprintf (fmt_str, sizeof (fmt_str),
+                        " Color: %%%" G_GSIZE_FORMAT "s %%%" G_GSIZE_FORMAT "s %%%" G_GSIZE_FORMAT "s",
+                        sizeof (buffer1) - 1,
+                        sizeof (buffer2) - 1,
+                        sizeof (buffer3) - 1);
+              fscanf (fp, fmt_str, buffer1, buffer2, buffer3);
+              source->color.r = g_ascii_strtod (buffer1, &endptr);
+              source->color.g = g_ascii_strtod (buffer2, &endptr);
+              source->color.b = g_ascii_strtod (buffer3, &endptr);
+              source->color.a = 1.0;
+
+              snprintf (fmt_str, sizeof (fmt_str),
+                        " Intensity: %%%" G_GSIZE_FORMAT "s",
+                        sizeof (buffer1) - 1);
+              fscanf (fp, fmt_str, buffer1);
+              source->intensity = g_ascii_strtod (buffer1, &endptr);
+
+            }
+
+          fclose (fp);
+        }
+
+      g_free (filename);
+
+      lightselect_callback (GIMP_INT_COMBO_BOX (lightselect_combo), NULL);
+   }
+
+  gtk_widget_destroy (GTK_WIDGET (chooser));
+  interactive_preview_callback (GTK_WIDGET (chooser));
+}
+
+
+static void
+lightselect_callback (GimpIntComboBox *combo,
+                      gpointer         data)
+{
+  gint valid;
+  gint j, k;
+
+  valid = gimp_int_combo_box_get_active (combo, &k);
+
+ if (valid)
+    {
+      mapvals.update_enabled = FALSE;  /* prevent apply_settings() */
+
+      mapvals.light_selected = k;
+      gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (light_type_combo),
+                                     mapvals.lightsource[k].type);
+      gimp_color_button_set_color (GIMP_COLOR_BUTTON (colorbutton),
+                                   &mapvals.lightsource[k].color);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON(spin_pos_x),
+                                 mapvals.lightsource[k].position.x);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON(spin_pos_y),
+                                 mapvals.lightsource[k].position.y);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON(spin_pos_z),
+                                 mapvals.lightsource[k].position.z);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON(spin_dir_x),
+                                 mapvals.lightsource[k].direction.x);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON(spin_dir_y),
+                                 mapvals.lightsource[k].direction.y);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON(spin_dir_z),
+                                 mapvals.lightsource[k].direction.z);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON(spin_intensity),
+                                 mapvals.lightsource[k].intensity);
+
+      mapvals.update_enabled = TRUE;
+
+      /* if we are isolating a light, need to switch */
+      if (mapvals.light_isolated)
+        {
+          for (j = 0; j < NUM_LIGHTS; j++)
+            if (j == mapvals.light_selected)
+              mapvals.lightsource[j].active = TRUE;
+            else
+              mapvals.lightsource[j].active = FALSE;
+        }
+
+      interactive_preview_callback (NULL);
+    }
+}
+
+static void
+isolate_selected_light (GtkWidget *widget,
+                        gpointer   data)
+{
+  gint  k;
+
+  if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (widget)))
+    {
+      mapvals.light_isolated = TRUE;
+
+      for (k = 0; k < NUM_LIGHTS; k++)
+        if (k == mapvals.light_selected)
+          mapvals.lightsource[k].active = TRUE;
+        else
+          mapvals.lightsource[k].active = FALSE;
+    }
+  else
+    {
+      mapvals.light_isolated = FALSE;
+
+      for (k = 0; k < NUM_LIGHTS; k++)
+        mapvals.lightsource[k].active = TRUE;
+    }
+
+  interactive_preview_callback (NULL);
+}
+
+static GtkWidget *
+spin_button_new (GtkAdjustment **adjustment,  /* return value */
+                 gdouble         value,
+                 gdouble         lower,
+                 gdouble         upper,
+                 gdouble         step_increment,
+                 gdouble         page_increment,
+                 gdouble         page_size,
+                 gdouble         climb_rate,
+                 guint           digits)
+{
+  GtkWidget *spinbutton;
+
+  *adjustment = (GtkAdjustment *)
+                gtk_adjustment_new (value, lower, upper,
+                                    step_increment, page_increment, 0);
+
+  spinbutton = gimp_spin_button_new (GTK_ADJUSTMENT (*adjustment),
+                                     climb_rate, digits);
+
+  gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (spinbutton), TRUE);
+
+  return spinbutton;
+}
diff --git a/plug-ins/lighting/lighting-ui.h b/plug-ins/lighting/lighting-ui.h
new file mode 100644
index 0000000..ad0ffba
--- /dev/null
+++ b/plug-ins/lighting/lighting-ui.h
@@ -0,0 +1,21 @@
+#ifndef __LIGHTING_UI_H__
+#define __LIGHTING_UI_H__
+
+/* Externally visible variables */
+/* ============================ */
+
+extern GtkWidget *previewarea;
+
+extern GtkWidget *spin_pos_x;
+extern GtkWidget *spin_pos_y;
+extern GtkWidget *spin_pos_z;
+extern GtkWidget *spin_dir_x;
+extern GtkWidget *spin_dir_y;
+extern GtkWidget *spin_dir_z;
+
+/* Externally visible functions */
+/* ============================ */
+
+gboolean main_dialog (gint32 drawable_id);
+
+#endif  /* __LIGHTING_UI_H__ */