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author | Tavian Barnes <tavianator@tavianator.com> | 2014-08-19 17:10:03 -0400 |
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committer | Tavian Barnes <tavianator@tavianator.com> | 2015-10-25 11:03:56 -0400 |
commit | 7b09710392d35fb55b52031d447a542d99fc6b4b (patch) | |
tree | 270eb927ee8c52ceeb99926ebf4843704775a610 /libdimension/model/finishes/lambertian.c | |
parent | 200c86b91ea7063d35be3bffc11c5da53c054653 (diff) | |
download | dimension-7b09710392d35fb55b52031d447a542d99fc6b4b.tar.xz |
Modularize the libdimension codebase.
Diffstat (limited to 'libdimension/model/finishes/lambertian.c')
-rw-r--r-- | libdimension/model/finishes/lambertian.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/libdimension/model/finishes/lambertian.c b/libdimension/model/finishes/lambertian.c new file mode 100644 index 0000000..9e041ed --- /dev/null +++ b/libdimension/model/finishes/lambertian.c @@ -0,0 +1,57 @@ +/************************************************************************* + * 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; +} |