1 files changed, 72 insertions, 0 deletions
diff --git a/libdimension/model/lights/point_light.c b/libdimension/model/lights/point_light.c
new file mode 100644
index 0000000..08aae67
--- /dev/null
+++ b/libdimension/model/lights/point_light.c
@@ -0,0 +1,72 @@
+/*************************************************************************
+ * Copyright (C) 2010-2014 Tavian Barnes <tavianator@tavianator.com>     *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library 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  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * Point lights.
+ */
+
+#include "dimension/model.h"
+#include <stdlib.h>
+
+/// Point light type.
+typedef struct dmnsn_point_light {
+  dmnsn_light light;
+  dmnsn_vector origin;
+  dmnsn_color color;
+} dmnsn_point_light;
+
+/// Point light direction callback.
+static dmnsn_vector
+dmnsn_point_light_direction_fn(const dmnsn_light *light, dmnsn_vector v)
+{
+  const dmnsn_point_light *point_light = (const dmnsn_point_light *)light;
+  return dmnsn_vector_sub(point_light->origin, v);
+}
+
+/// Point light illumination callback.
+static dmnsn_color
+dmnsn_point_light_illumination_fn(const dmnsn_light *light, dmnsn_vector v)
+{
+  const dmnsn_point_light *point_light = (const dmnsn_point_light *)light;
+  return point_light->color;
+}
+
+/// Point light illumination callback.
+static bool
+dmnsn_point_light_shadow_fn(const dmnsn_light *light, double t)
+{
+  return t < 1.0;
+}
+
+dmnsn_light *
+dmnsn_new_point_light(dmnsn_pool *pool, dmnsn_vector x0, dmnsn_color color)
+{
+  dmnsn_point_light *point_light = DMNSN_PALLOC(pool, dmnsn_point_light);
+  point_light->origin = x0;
+  point_light->color = color;
+
+  dmnsn_light *light = &point_light->light;
+  dmnsn_init_light(light);
+  light->direction_fn = dmnsn_point_light_direction_fn;
+  light->illumination_fn = dmnsn_point_light_illumination_fn;
+  light->shadow_fn = dmnsn_point_light_shadow_fn;
+  return light;
+}