From 7acd8ea6673b7a90ed4041408ccf1b024b8a007a Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Sun, 12 Jun 2011 02:37:51 -0600 Subject: 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. --- libdimension/lambertian.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 libdimension/lambertian.c (limited to 'libdimension/lambertian.c') 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 * + * * + * 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 * + * . * + *************************************************************************/ + +/** + * @file + * Diffuse finish. + */ + +#include "dimension.h" +#include +#include + +/** 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; +} -- cgit v1.2.3