From 6787a9219748575cd63aaadd483f49a4fd83b543 Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Sat, 9 Jan 2010 20:38:51 -0500 Subject: Implement reflection. --- libdimension/reflective.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 libdimension/reflective.c (limited to 'libdimension/reflective.c') diff --git a/libdimension/reflective.c b/libdimension/reflective.c new file mode 100644 index 0000000..f1c7355 --- /dev/null +++ b/libdimension/reflective.c @@ -0,0 +1,74 @@ +/************************************************************************* + * Copyright (C) 2009 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 * + * . * + *************************************************************************/ + +#include "dimension.h" +#include /* For malloc */ +#include + +/* + * Reflective finish + */ + +typedef struct dmnsn_reflection_params { + dmnsn_color min, max; + double falloff; +} dmnsn_reflection_params; + +static dmnsn_color +dmnsn_reflective_finish_fn(const dmnsn_finish *finish, + dmnsn_color reflect, dmnsn_color color, + dmnsn_vector ray, dmnsn_vector normal) +{ + dmnsn_reflection_params *params = finish->ptr; + double reflection = pow(dmnsn_vector_dot(ray, normal), params->falloff); + + return dmnsn_color_illuminate( + dmnsn_color_add( + dmnsn_color_mul( + reflection, + dmnsn_color_sub(params->max, params->min) + ), + params->min + ), + reflect + ); +} + +dmnsn_finish * +dmnsn_new_reflective_finish(dmnsn_color min, dmnsn_color max, double falloff) +{ + dmnsn_finish *finish = dmnsn_new_finish(); + if (finish) { + dmnsn_reflection_params *params = malloc(sizeof(dmnsn_reflection_params)); + if (!params) { + dmnsn_delete_finish(finish); + return NULL; + } + + params->min = min; + params->max = max; + params->falloff = falloff; + + finish->ptr = params; + finish->reflection_fn = &dmnsn_reflective_finish_fn; + finish->free_fn = &free; + } + return finish; +} -- cgit v1.2.3