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/*************************************************************************
* 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>
/*
* Finish combinations
*/
static dmnsn_color
dmnsn_finish_combination_fn(const dmnsn_finish *finish,
dmnsn_color light, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal,
dmnsn_vector viewer)
{
dmnsn_finish **params = finish->ptr;
if (params[0]->finish_fn && params[1]->finish_fn) {
return dmnsn_color_add((*params[0]->finish_fn)(params[0], light, color, ray,
normal, viewer),
(*params[1]->finish_fn)(params[1], light, color, ray,
normal, viewer));
} else if (params[0]->finish_fn) {
return (*params[0]->finish_fn)(params[0], light, color, ray,
normal, viewer);
} else if (params[1]->finish_fn) {
return (*params[1]->finish_fn)(params[1], light, color, ray,
normal, viewer);
} else {
return dmnsn_black;
}
}
static dmnsn_color
dmnsn_finish_combination_ambient_fn(const dmnsn_finish *finish,
dmnsn_color pigment)
{
dmnsn_finish **params = finish->ptr;
if (params[0]->ambient_fn && params[1]->ambient_fn) {
return dmnsn_color_add((*params[0]->ambient_fn)(params[0], pigment),
(*params[1]->ambient_fn)(params[1], pigment));
} else if (params[0]->ambient_fn) {
return (*params[0]->ambient_fn)(params[0], pigment);
} else if (params[1]->ambient_fn) {
return (*params[1]->ambient_fn)(params[1], pigment);
} else {
return dmnsn_black;
}
}
static void
dmnsn_finish_combination_free_fn(void *ptr)
{
dmnsn_finish **params = ptr;
dmnsn_delete_finish(params[0]);
dmnsn_delete_finish(params[1]);
free(ptr);
}
dmnsn_finish *
dmnsn_new_finish_combination(dmnsn_finish *f1, dmnsn_finish *f2)
{
if (f1 && f2) {
dmnsn_finish *finish = dmnsn_new_finish();
if (finish) {
dmnsn_finish **params = malloc(2*sizeof(dmnsn_finish *));
if (!params) {
dmnsn_delete_finish(finish);
dmnsn_delete_finish(f2);
dmnsn_delete_finish(f1);
return NULL;
}
params[0] = f1;
params[1] = f2;
finish->ptr = params;
finish->finish_fn = &dmnsn_finish_combination_fn;
finish->ambient_fn = &dmnsn_finish_combination_ambient_fn;
finish->free_fn = &dmnsn_finish_combination_free_fn;
return finish;
} else {
dmnsn_delete_finish(f2);
dmnsn_delete_finish(f1);
}
} else if (f1) {
dmnsn_delete_finish(f1);
} else if (f2) {
dmnsn_delete_finish(f2);
}
return NULL;
}
/*
* Ambient finish
*/
static dmnsn_color
dmnsn_ambient_finish_fn(const dmnsn_finish *finish, dmnsn_color pigment)
{
dmnsn_color *ambient = finish->ptr;
return dmnsn_color_illuminate(*ambient, pigment);
}
dmnsn_finish *
dmnsn_new_ambient_finish(dmnsn_color ambient)
{
dmnsn_finish *finish = dmnsn_new_finish();
if (finish) {
dmnsn_color *param = malloc(sizeof(dmnsn_color));
if (!param) {
dmnsn_delete_finish(finish);
return NULL;
}
*param = ambient;
finish->ptr = param;
finish->ambient_fn = &dmnsn_ambient_finish_fn;
finish->free_fn = &free;
}
return finish;
}
/*
* Diffuse finish
*/
static dmnsn_color
dmnsn_diffuse_finish_fn(const dmnsn_finish *finish,
dmnsn_color light, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal,
dmnsn_vector viewer)
{
double *diffuse = finish->ptr;
double diffuse_factor = (*diffuse)*dmnsn_vector_dot(ray, normal);
return dmnsn_color_mul(diffuse_factor, dmnsn_color_illuminate(light, color));
}
dmnsn_finish *
dmnsn_new_diffuse_finish(double diffuse)
{
dmnsn_finish *finish = dmnsn_new_finish();
if (finish) {
double *param = malloc(sizeof(double));
if (!param) {
dmnsn_delete_finish(finish);
return NULL;
}
*param = diffuse;
finish->ptr = param;
finish->finish_fn = &dmnsn_diffuse_finish_fn;
finish->free_fn = &free;
}
return finish;
}
/*
* Phong finish
*/
static dmnsn_color
dmnsn_phong_finish_fn(const dmnsn_finish *finish,
dmnsn_color light, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal,
dmnsn_vector viewer)
{
double *params = finish->ptr;
double specular = params[0];
double exp = params[1];
dmnsn_vector proj = dmnsn_vector_mul(2*dmnsn_vector_dot(ray, normal), normal);
dmnsn_vector reflected = dmnsn_vector_sub(proj, ray);
double specular_factor = pow(dmnsn_vector_dot(reflected, viewer), exp);
return dmnsn_color_mul(specular*specular_factor, light);
}
/* A phong finish */
dmnsn_finish *
dmnsn_new_phong_finish(double specular, double exp)
{
dmnsn_finish *finish = dmnsn_new_finish();
if (finish) {
double *params = malloc(2*sizeof(double));
if (!params) {
dmnsn_delete_finish(finish);
return NULL;
}
params[0] = specular;
params[1] = exp;
finish->ptr = params;
finish->finish_fn = &dmnsn_phong_finish_fn;
finish->free_fn = &free;
}
return finish;
}
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