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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/finishes/lambertian.c
parent200c86b91ea7063d35be3bffc11c5da53c054653 (diff)
downloaddimension-7b09710392d35fb55b52031d447a542d99fc6b4b.tar.xz
Modularize the libdimension codebase.
Diffstat (limited to 'libdimension/model/finishes/lambertian.c')
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diff --git a/libdimension/model/finishes/lambertian.c b/libdimension/model/finishes/lambertian.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
+ * Diffuse finish.
+ */
+
+#include "dimension/model.h"
+#include <math.h>
+#include <stdlib.h>
+
+/// Lambertian diffuse type.
+typedef struct dmnsn_lambertian {
+ dmnsn_diffuse diffuse;
+ double coeff;
+} dmnsn_lambertian;
+
+/// Diffuse finish callback.
+static dmnsn_color
+dmnsn_lambertian_diffuse_fn(const dmnsn_diffuse *diffuse,
+ dmnsn_color light, dmnsn_color color,
+ dmnsn_vector ray, dmnsn_vector normal)
+{
+ const dmnsn_lambertian *lambertian = (const dmnsn_lambertian *)diffuse;
+ double diffuse_factor = fabs((lambertian->coeff)*dmnsn_vector_dot(ray, normal));
+ return dmnsn_color_mul(diffuse_factor, dmnsn_color_illuminate(light, color));
+}
+
+dmnsn_diffuse *
+dmnsn_new_lambertian(dmnsn_pool *pool, double coeff)
+{
+ dmnsn_lambertian *lambertian = DMNSN_PALLOC(pool, dmnsn_lambertian);
+ lambertian->coeff = coeff;
+
+ dmnsn_diffuse *diffuse = &lambertian->diffuse;
+ dmnsn_init_diffuse(diffuse);
+ diffuse->diffuse_fn = dmnsn_lambertian_diffuse_fn;
+ return diffuse;
+}