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author | Tavian Barnes <tavianator@gmail.com> | 2010-01-09 20:38:51 -0500 |
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committer | Tavian Barnes <tavianator@gmail.com> | 2010-01-09 20:38:51 -0500 |
commit | 6787a9219748575cd63aaadd483f49a4fd83b543 (patch) | |
tree | 24291f7948ce2e7712260d6b76e48b68c086987e /libdimension/reflective.c | |
parent | e541fdb578ee9755c78d4f835edf0fa6bf8aea92 (diff) | |
download | dimension-6787a9219748575cd63aaadd483f49a4fd83b543.tar.xz |
Implement reflection.
Diffstat (limited to 'libdimension/reflective.c')
-rw-r--r-- | libdimension/reflective.c | 74 |
1 files changed, 74 insertions, 0 deletions
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 <tavianator@gmail.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/>. * + *************************************************************************/ + +#include "dimension.h" +#include <stdlib.h> /* For malloc */ +#include <math.h> + +/* + * 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; +} |