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/**
* Jitter offset table
*
* $Id$
*
* ***** BEGIN GPL/BL DUAL 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. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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/BL DUAL LICENSE BLOCK *****
*/
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "MEM_guardedalloc.h"
#include "BLI_arithb.h"
#include "BLI_rand.h"
#include "render.h"
#include "jitter.h"
float jit[64][2];
void init_render_jit(int nr);
void RE_jitterate1(float *jit1, float *jit2, int num, float rad1)
{
int i , j , k;
float vecx, vecy, dvecx, dvecy, x, y, len;
for (i = 2*num-2; i>=0 ; i-=2) {
dvecx = dvecy = 0.0;
x = jit1[i];
y = jit1[i+1];
for (j = 2*num-2; j>=0 ; j-=2) {
if (i != j){
vecx = jit1[j] - x - 1.0;
vecy = jit1[j+1] - y - 1.0;
for (k = 3; k>0 ; k--){
if( fabs(vecx)<rad1 && fabs(vecy)<rad1) {
len= sqrt(vecx*vecx + vecy*vecy);
if(len>0 && len<rad1) {
len= len/rad1;
dvecx += vecx/len;
dvecy += vecy/len;
}
}
vecx += 1.0;
if( fabs(vecx)<rad1 && fabs(vecy)<rad1) {
len= sqrt(vecx*vecx + vecy*vecy);
if(len>0 && len<rad1) {
len= len/rad1;
dvecx += vecx/len;
dvecy += vecy/len;
}
}
vecx += 1.0;
if( fabs(vecx)<rad1 && fabs(vecy)<rad1) {
len= sqrt(vecx*vecx + vecy*vecy);
if(len>0 && len<rad1) {
len= len/rad1;
dvecx += vecx/len;
dvecy += vecy/len;
}
}
vecx -= 2.0;
vecy += 1.0;
}
}
}
x -= dvecx/18.0 ;
y -= dvecy/18.0;
x -= floor(x) ;
y -= floor(y);
jit2[i] = x;
jit2[i+1] = y;
}
memcpy(jit1,jit2,2 * num * sizeof(float));
}
void RE_jitterate2(float *jit1, float *jit2, int num, float rad2)
{
int i, j;
float vecx, vecy, dvecx, dvecy, x, y;
for (i=2*num -2; i>= 0 ; i-=2){
dvecx = dvecy = 0.0;
x = jit1[i];
y = jit1[i+1];
for (j =2*num -2; j>= 0 ; j-=2){
if (i != j){
vecx = jit1[j] - x - 1.0;
vecy = jit1[j+1] - y - 1.0;
if( fabs(vecx)<rad2) dvecx+= vecx*rad2;
vecx += 1.0;
if( fabs(vecx)<rad2) dvecx+= vecx*rad2;
vecx += 1.0;
if( fabs(vecx)<rad2) dvecx+= vecx*rad2;
if( fabs(vecy)<rad2) dvecy+= vecy*rad2;
vecy += 1.0;
if( fabs(vecy)<rad2) dvecy+= vecy*rad2;
vecy += 1.0;
if( fabs(vecy)<rad2) dvecy+= vecy*rad2;
}
}
x -= dvecx/2 ;
y -= dvecy/2;
x -= floor(x) ;
y -= floor(y);
jit2[i] = x;
jit2[i+1] = y;
}
memcpy(jit1,jit2,2 * num * sizeof(float));
}
void initjit(float *jitarr, int num)
{
float *jit2, x, rad1, rad2, rad3;
int i;
if(num==0) return;
jit2= MEM_mallocN(12 + 2*sizeof(float)*num, "initjit");
rad1= 1.0/sqrt((float)num);
rad2= 1.0/((float)num);
rad3= sqrt((float)num)/((float)num);
BLI_srand(31415926 + num);
x= 0;
for(i=0; i<2*num; i+=2) {
jitarr[i]= x+ rad1*(0.5-BLI_drand());
jitarr[i+1]= ((float)i/2)/num +rad1*(0.5-BLI_drand());
x+= rad3;
x -= floor(x);
}
for (i=0 ; i<24 ; i++) {
RE_jitterate1(jitarr, jit2, num, rad1);
RE_jitterate1(jitarr, jit2, num, rad1);
RE_jitterate2(jitarr, jit2, num, rad2);
}
MEM_freeN(jit2);
/* finally, move jittertab to be centered around (0,0) */
for(i=0; i<2*num; i+=2) {
jitarr[i] -= 0.5;
jitarr[i+1] -= 0.5;
}
}
void init_render_jit(int nr)
{
static int lastjit= 0;
if(lastjit==nr) return;
memset(jit, 0, 64*2*4);
initjit(jit[0], nr);
lastjit= nr;
}
/* eof */
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