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author | Tavian Barnes <tavianator@gmail.com> | 2011-06-12 02:37:51 -0600 |
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committer | Tavian Barnes <tavianator@gmail.com> | 2011-06-13 00:16:06 -0600 |
commit | 7acd8ea6673b7a90ed4041408ccf1b024b8a007a (patch) | |
tree | d52199dd7c58e0217bfd1a74e7601d739ad333f5 /libdimension/lambertian.c | |
parent | 066261810c2fca192677c5c1c01c91d6ecec65a0 (diff) | |
download | dimension-7acd8ea6673b7a90ed4041408ccf1b024b8a007a.tar.xz |
Vast libdimension API and internals improvements.
Couldn't really do these while I was trying to be POV-Ray compatible,
'cause they would've broken compatibility.
Diffstat (limited to 'libdimension/lambertian.c')
-rw-r--r-- | libdimension/lambertian.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/libdimension/lambertian.c b/libdimension/lambertian.c new file mode 100644 index 0000000..089ce56 --- /dev/null +++ b/libdimension/lambertian.c @@ -0,0 +1,58 @@ +/************************************************************************* + * Copyright (C) 2010 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.h" +#include <math.h> +#include <stdlib.h> + +/** 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) +{ + double *coeff = diffuse->ptr; + double diffuse_factor = fabs((*coeff)*dmnsn_vector_dot(ray, normal)); + dmnsn_color ret + = dmnsn_color_mul(diffuse_factor, dmnsn_color_illuminate(light, color)); + ret.filter = 0.0; + ret.trans = 0.0; + return ret; +} + +dmnsn_diffuse * +dmnsn_new_lambertian(double diffuse) +{ + dmnsn_diffuse *lambertian = dmnsn_new_diffuse(); + + double *param = dmnsn_malloc(sizeof(double)); + *param = diffuse; + + lambertian->diffuse_fn = dmnsn_lambertian_diffuse_fn; + lambertian->free_fn = dmnsn_free; + lambertian->ptr = param; + + return lambertian; +} |