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/**
** sipp - SImple Polygon Processor
**
** A general 3d graphic package
**
** Copyright Equivalent Software HB 1992
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 1, or any later version.
** This program 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 General Public License for more details.
** You can receive a copy of the GNU General Public License from the
** Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**/
/**
** bumpy.c - Bumpy shader: simulates an bumpy surfaces using noise and Dnoise
**/
#include <math.h>
#include <stdio.h>
#include <sipp.h>
#include <geometric.h>
#include <noise.h>
#include <shaders.h>
extern bool noise_ready;
void
bumpy_shader(pos, normal, texture, view_vec, lights, bd, color, opacity)
Vector *pos;
Vector *normal;
Vector *texture;
Vector *view_vec;
Lightsource *lights;
Bumpy_desc *bd;
Color *color;
Color *opacity;
{
Vector tmp;
Vector norm;
double len;
double no;
if (!noise_ready) {
noise_init();
}
VecCopy(norm, *normal);
vecnorm(&norm);
VecScalMul(tmp, bd->scale, *texture);
if ((bd->bumpflag && bd->holeflag)
|| ((no = noise(&tmp)) < 0.0 && bd->bumpflag)
|| (no > 0.0 && bd->holeflag)) {
tmp = Dnoise(&tmp);
VecAdd(norm, norm, tmp);
}
bd->shader(pos, &norm, texture, view_vec, lights, bd->surface,
color, opacity);
}
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