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/reflection.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 libdimension/reflection.c (limited to 'libdimension/reflection.c') diff --git a/libdimension/reflection.c b/libdimension/reflection.c new file mode 100644 index 0000000..2417304 --- /dev/null +++ b/libdimension/reflection.c @@ -0,0 +1,67 @@ +/************************************************************************* + * 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 + * Reflective finish. + */ + +#include "dimension.h" +#include +#include + +/** Reflective finish payload. */ +typedef struct dmnsn_reflection_params { + dmnsn_color min, max; + double falloff; +} dmnsn_reflection_params; + +/** Reflective finish callback. */ +static dmnsn_color +dmnsn_basic_reflection_fn(const dmnsn_reflection *reflection, + dmnsn_color reflect, dmnsn_color color, + dmnsn_vector ray, dmnsn_vector normal) +{ + dmnsn_reflection_params *params = reflection->ptr; + double coeff = pow(fabs(dmnsn_vector_dot(ray, normal)), params->falloff); + + return dmnsn_color_illuminate( + dmnsn_color_gradient(params->min, params->max, coeff), + reflect + ); +} + +dmnsn_reflection * +dmnsn_new_basic_reflection(dmnsn_color min, dmnsn_color max, double falloff) +{ + dmnsn_reflection *reflection = dmnsn_new_reflection(); + + dmnsn_reflection_params *params + = dmnsn_malloc(sizeof(dmnsn_reflection_params)); + params->min = min; + params->max = max; + params->falloff = falloff; + + reflection->reflection_fn = dmnsn_basic_reflection_fn; + reflection->free_fn = dmnsn_free; + reflection->ptr = params; + + return reflection; +} -- cgit v1.2.3