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authorTavian Barnes <tavianator@tavianator.com>2014-08-19 17:10:03 -0400
committerTavian Barnes <tavianator@tavianator.com>2015-10-25 11:03:56 -0400
commit7b09710392d35fb55b52031d447a542d99fc6b4b (patch)
tree270eb927ee8c52ceeb99926ebf4843704775a610 /libdimension/model/objects/plane.c
parent200c86b91ea7063d35be3bffc11c5da53c054653 (diff)
downloaddimension-7b09710392d35fb55b52031d447a542d99fc6b4b.tar.xz
Modularize the libdimension codebase.
Diffstat (limited to 'libdimension/model/objects/plane.c')
-rw-r--r--libdimension/model/objects/plane.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/libdimension/model/objects/plane.c b/libdimension/model/objects/plane.c
new file mode 100644
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+++ b/libdimension/model/objects/plane.c
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+/*************************************************************************
+ * 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
+ * Planes.
+ */
+
+#include "dimension/model.h"
+#include <math.h>
+#include <stdlib.h>
+
+/// Plane type.
+typedef struct {
+ dmnsn_object object;
+ dmnsn_vector normal;
+} dmnsn_plane;
+
+/// Returns the closest intersection of `ray' with `plane'.
+static bool
+dmnsn_plane_intersection_fn(const dmnsn_object *object, dmnsn_ray ray,
+ dmnsn_intersection *intersection)
+{
+ const dmnsn_plane *plane = (const dmnsn_plane *)object;
+ dmnsn_vector normal = plane->normal;
+
+ double den = dmnsn_vector_dot(ray.n, normal);
+ if (den != 0.0) {
+ double t = -dmnsn_vector_dot(ray.x0, normal)/den;
+ if (t >= 0.0) {
+ intersection->t = t;
+ intersection->normal = normal;
+ return true;
+ }
+ }
+ return false;
+}
+
+/// Return whether a point is inside a plane.
+static bool
+dmnsn_plane_inside_fn(const dmnsn_object *object, dmnsn_vector point)
+{
+ const dmnsn_plane *plane = (const dmnsn_plane *)object;
+ return dmnsn_vector_dot(point, plane->normal) < 0.0;
+}
+
+/// Plane bounding callback.
+static dmnsn_aabb
+dmnsn_plane_bounding_fn(const dmnsn_object *object, dmnsn_matrix trans)
+{
+ return dmnsn_infinite_aabb();
+}
+
+/// Plane vtable.
+static const dmnsn_object_vtable dmnsn_plane_vtable = {
+ .intersection_fn = dmnsn_plane_intersection_fn,
+ .inside_fn = dmnsn_plane_inside_fn,
+ .bounding_fn = dmnsn_plane_bounding_fn,
+};
+
+dmnsn_object *
+dmnsn_new_plane(dmnsn_pool *pool, dmnsn_vector normal)
+{
+ dmnsn_plane *plane = DMNSN_PALLOC(pool, dmnsn_plane);
+ plane->normal = normal;
+
+ dmnsn_object *object = &plane->object;
+ dmnsn_init_object(object);
+ object->vtable = &dmnsn_plane_vtable;
+ return object;
+}