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-rw-r--r--libdimension/model/cameras/perspective.c47
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diff --git a/libdimension/model/cameras/perspective.c b/libdimension/model/cameras/perspective.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
+ * Perspective cameras.
+ */
+
+#include "dimension/model.h"
+#include <stdlib.h>
+
+/// Perspective camera ray callback.
+static dmnsn_ray
+dmnsn_perspective_camera_ray_fn(const dmnsn_camera *camera, double x, double y)
+{
+ dmnsn_ray l = dmnsn_new_ray(
+ dmnsn_zero,
+ dmnsn_new_vector(x - 0.5, y - 0.5, 1.0)
+ );
+ return l;
+}
+
+// Create a new perspective camera.
+dmnsn_camera *
+dmnsn_new_perspective_camera(dmnsn_pool *pool)
+{
+ dmnsn_camera *camera = dmnsn_new_camera(pool);
+ camera->ray_fn = dmnsn_perspective_camera_ray_fn;
+ return camera;
+}