blender/release/plugins/texture/tiles.c

178 lines
4.0 KiB
C

/**
*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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 2
* of the License, or (at your option) 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 should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL LICENSE BLOCK *****
*/
#include "math.h"
#include "plugin.h"
/* ******************** GLOBAL VARIABLES ***************** */
char name[]= "tiles";
/* Subtype names must be less than 15 characters */
#define NR_TYPES 2
char stnames[NR_TYPES][16]= {"Square", "Deformed"};
VarStruct varstr[]= {
NUM|FLO, "size", 1.0, 0.0, 1.0, "The size of each tile",
NUM|FLO, "Noise", 1.0, 0.01, 10.0, ""
};
/* The cast struct is for input in the main doit function
Varstr and Cast must have the same variables in the same order */
typedef struct Cast {
float size;
float noise;
} Cast;
/* result:
Intensity, R, G, B, Alpha, nor.x, nor.y, nor.z
*/
float result[8];
/* cfra: the current frame */
float cfra;
int plugin_tex_doit(int, Cast *, float *, float *, float *, float *);
void plugin_instance_init(Cast*);
/* ******************** Fixed functions ***************** */
int plugin_tex_getversion(void)
{
return B_PLUGIN_VERSION;
}
void plugin_but_changed(int but)
{
}
void plugin_init(void)
{
}
/*
* initialize any data for a particular instance of
* the plugin here
*/
void plugin_instance_init(Cast *cast)
{
}
/* this function should not be changed: */
void plugin_getinfo(PluginInfo *info)
{
info->name= name;
info->stypes= NR_TYPES;
info->nvars= sizeof(varstr)/sizeof(VarStruct);
info->snames= stnames[0];
info->result= result;
info->cfra= &cfra;
info->varstr= varstr;
info->init= plugin_init;
info->tex_doit= (TexDoit) plugin_tex_doit;
info->callback= plugin_but_changed;
info->instance_init= (void (*)(void *)) plugin_instance_init;
}
/* ************************************************************
Tiles
Demonstration of a simple square wave function sampled
with anti-aliasing.
It is not mipmapped yet...
************************************************************ */
/* square wave, antialiased, no mipmap! */
float sample_wave(float freq, float coord, float pixsize)
{
float fac, frac, retval;
int part1, part2;
if(pixsize > freq) return 0.5;
pixsize/= freq;
fac= coord/freq;
part1= ffloor(fac);
frac= fac - part1;
if(part1 & 1) retval= 0.0;
else retval= 1.0;
if(pixsize != 0.0) {
/* is coord+pixsize another value? */
part2= ffloor(fac + pixsize);
if(part1==part2) return retval;
/* antialias */
if(retval==1.0) retval= (1.0-frac)/pixsize;
else retval= 1.0-(1.0-frac)/pixsize;
}
return retval;
}
int plugin_tex_doit(int stype, Cast *cast, float *texvec, float *dxt, float *dyt, float *result)
{
float xwave, ywave;
if(stype==1) {
texvec[0]+= hnoise(cast->noise, texvec[0], texvec[1], texvec[2]);
texvec[1]+= hnoise(cast->noise, texvec[1], texvec[2], texvec[0]);
}
if(dxt && dyt) {
xwave= sample_wave(cast->size, texvec[0], fabs(dxt[0]) + fabs(dyt[0]) );
ywave= sample_wave(cast->size, texvec[1], fabs(dxt[1]) + fabs(dyt[1]) );
if(xwave > ywave) result[0]= xwave-ywave;
else result[0]= ywave-xwave;
}
else {
xwave= sample_wave(cast->size, texvec[0], 0.0 );
ywave= sample_wave(cast->size, texvec[1], 0.0 );
if(xwave > ywave) result[0]= xwave-ywave;
else result[0]= ywave-xwave;
}
return TEX_INT;
}