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tdemultimedia/kscd/kscdmagic/core.cpp

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/* Synaesthesia - program to display sound graphically
Copyright (C) 1997 Paul Francis Harrison
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 author may be contacted at:
pfh@yoyo.cc.monash.edu.au
or
27 Bond St., Mt. Waverley, 3149, Melbourne, Australia
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include "syna.h"
double cosTable[n], negSinTable[n];
int bitReverse[n];
int scaleDown[256];
int maxStarRadius;
int bitReverser(int i) {
int sum=0,j;
for(j=0;j<m;j++) {
sum = (i&1)+sum*2;
i >>= 1;
}
return sum;
}
void fft(double *x,double *y) {
int n2 = n, n1;
int twoToTheK;
for(twoToTheK=1;twoToTheK<n;twoToTheK*=2) {
n1 = n2;
n2 /= 2;
for(int j=0;j<n2;j++) {
double c = cosTable[j*twoToTheK&(n-1)],
s = negSinTable[j*twoToTheK&(n-1)];
for(int i=j;i<n;i+=n1) {
int l = i+n2;
double xt = x[i] - x[l];
x[i] = (x[i] + x[l]);
double yt = y[i] - y[l];
y[i] = (y[i] + y[l]);
x[l] = xt*c - yt*s;
y[l] = xt*s + yt*c;
}
}
}
}
void coreInit() {
int i;
for(i=0;i<n;i++) {
negSinTable[i] = -sin(3.141592*2.0/n*i);
cosTable[i] = cos(3.141592*2.0/n*i);
bitReverse[i] = bitReverser(i);
}
}
void setStarSize(double size) {
//int factor = (fadeMode == Flame ? 100 :
// (fadeMode == Wave ? 150 : 200));
double fadeModeFudge = (fadeMode == Wave ? 0.4 :
(fadeMode == Flame ? 0.6 : 0.78));
int factor;
if (size > 0.0)
factor = int(exp(log(fadeModeFudge) / (size*8.0))*255);
else
factor = 0;
if (factor > 255) factor = 255;
for(int i=0;i<256;i++)
scaleDown[i] = i*factor>>8;
maxStarRadius = 1;
for(int i=255;i;i = scaleDown[i])
maxStarRadius++;
}
inline void addPixel(int x,int y,int br1,int br2) {
if (x < 0 || x >= outWidth || y < 0 || y >= outHeight) return;
unsigned char *p = ucoutput+x*2+y*outWidth*2;
if (p[0] < 255-br1) p[0] += br1; else p[0] = 255;
if (p[1] < 255-br2) p[1] += br2; else p[1] = 255;
//p += lastOutput-output;
//if (p[0] < 255-br1) p[0] += br1; else p[0] = 255;
//if (p[1] < 255-br2) p[1] += br2; else p[1] = 255;
}
inline void addPixelFast(unsigned char *p,int br1,int br2) {
if (p[0] < 255-br1) p[0] += br1; else p[0] = 255;
if (p[1] < 255-br2) p[1] += br2; else p[1] = 255;
//p += lastOutput-output;
//if (p[0] < 255-br1) p[0] += br1; else p[0] = 255;
//if (p[1] < 255-br2) p[1] += br2; else p[1] = 255;
}
void fadeFade() {
unsigned long *ptr = (unsigned long*)ucoutput;
int i = outWidth*outHeight*2/4;
do {
//Bytewize version was: *(ptr++) -= *ptr+(*ptr>>1)>>4;
if (*ptr)
//if (*ptr & 0xf0f0f0f0ul)
*(ptr++) -= ((*ptr & 0xf0f0f0f0ul) >> 4) + ((*ptr & 0xe0e0e0e0ul) >> 5);
//else {
// *(ptr++) = (*ptr * 14 >> 4) & 0x0f0f0f0ful;
//}
else
ptr++;
} while(--i > 0);
}
inline unsigned char getPixel(int x,int y,int where) {
if (x < 0 || y < 0 || x >= outWidth || y >= outHeight) return 0;
return lastOutput[where];
}
inline void fadePixelWave(int x,int y,int where,int step) {
short j =
( short(getPixel(x-1,y,where-2))+
getPixel(x+1,y,where+2)+
getPixel(x,y-1,where-step)+
getPixel(x,y+1,where+step)
>> 2)
+lastOutput[where];
if (!j) { ucoutput[where] = 0; return; }
j = j
-lastLastOutput[where]
-1;
if (j < 0) ucoutput[where] = 0;
else if (j & (255*256)) ucoutput[where] = 255;
else ucoutput[where] = j;
}
void fadeWave() {
unsigned short *t = lastLastOutputBmp.data;
lastLastOutputBmp.data = lastOutputBmp.data;
lastOutputBmp.data = outputBmp.data;
outputBmp.data = t;
int x,y,i,j,start,end;
int step = outWidth*2;
for(x=0,i=0,j=outWidth*(outHeight-1)*2;x<outWidth;x++,i+=2,j+=2) {
fadePixelWave(x,0,i,step);
fadePixelWave(x,0,i+1,step);
fadePixelWave(x,outHeight-1,j,step);
fadePixelWave(x,outHeight-1,j+1,step);
}
for(y=1,i=outWidth*2,j=outWidth*4-2;y<outHeight;y++,i+=step,j+=step) {
fadePixelWave(0,y,i,step);
fadePixelWave(0,y,i+1,step);
fadePixelWave(outWidth-1,y,j,step);
fadePixelWave(outWidth-1,y,j+1,step);
}
for(y=1,
start=outWidth*2+2,
end=outWidth*4-2; y<outHeight-1; y++,start+=step,end+=step) {
int i = start;
do {
short j =
( short(lastOutput[i-2])+
lastOutput[i+2]+
lastOutput[i-step]+
lastOutput[i+step]
>> 2)
+lastOutput[i];
if (!j) {
ucoutput[i] = 0;
} else {
j = j
-lastLastOutput[i]
-1;
if (j < 0) ucoutput[i] = 0;
else if (j & (255*256)) ucoutput[i] = 255;
else ucoutput[i] = j;
}
} while(++i < end);
}
}
inline void fadePixelHeat(int x,int y,int where,int step) {
short j =
( short(getPixel(x-1,y,where-2))+
getPixel(x+1,y,where+2)+
getPixel(x,y-1,where-step)+
getPixel(x,y+1,where+step)
>> 2)
+lastOutput[where];
if (!j) { ucoutput[where] = 0; return; }
j = j
-lastLastOutput[where]
-1;
if (j < 0) ucoutput[where] = 0;
else if (j & (255*256)) ucoutput[where] = 255;
else ucoutput[where] = j;
}
void fadeHeat() {
unsigned short *t = lastLastOutputBmp.data;
lastLastOutputBmp.data = lastOutputBmp.data;
lastOutputBmp.data = outputBmp.data;
outputBmp.data = t;
int x,y,i,j,start,end;
int step = outWidth*2;
for(x=0,i=0,j=outWidth*(outHeight-1)*2;x<outWidth;x++,i+=2,j+=2) {
fadePixelHeat(x,0,i,step);
fadePixelHeat(x,0,i+1,step);
fadePixelHeat(x,outHeight-1,j,step);
fadePixelHeat(x,outHeight-1,j+1,step);
}
for(y=1,i=outWidth*2,j=outWidth*4-2;y<outHeight;y++,i+=step,j+=step) {
fadePixelHeat(0,y,i,step);
fadePixelHeat(0,y,i+1,step);
fadePixelHeat(outWidth-1,y,j,step);
fadePixelHeat(outWidth-1,y,j+1,step);
}
for(y=1,
start=outWidth*2+2,
end=outWidth*4-2; y<outHeight-1; y++,start+=step,end+=step) {
int i = start;
do {
short j =
( short(lastOutput[i-2])+
lastOutput[i+2]+
+lastOutput[i-step]
+lastOutput[i+step]
>> 2)
+lastOutput[i];
if (!j) {
ucoutput[i] = 0;
} else {
j = j
-lastLastOutput[i]
+(lastLastOutput[i]
-lastOutput[i]>>2)
-1;
if (j < 0) ucoutput[i] = 0;
else if (j & (255*256)) ucoutput[i] = 255;
else ucoutput[i] = j;
}
} while(++i < end);
}
}
void fade() {
switch(fadeMode) {
case Stars :
fadeFade();
break;
case Flame :
fadeHeat();
break;
case Wave :
fadeWave();
break;
default:
break;
}
}
int coreGo() {
double x[n], y[n];
double a[n], b[n];
int clarity[n]; //Surround sound
int i,j,k;
int brightFactor = int(brightness * brightnessTwiddler /(starSize+0.01));
if (-1 == getNextFragment())
{
fprintf(stderr, "no frag\n" );
return -1;
}
for(i=0;i<n;i++) {
x[i] = data[i*2];
y[i] = data[i*2+1];
}
fft(x,y);
for(i=0 +1;i<n;i++) {
double x1 = x[bitReverse[i]],
y1 = y[bitReverse[i]],
x2 = x[bitReverse[n-i]],
y2 = y[bitReverse[n-i]],
aa,bb;
a[i] = sqrt(aa= (x1+x2)*(x1+x2) + (y1-y2)*(y1-y2) );
b[i] = sqrt(bb= (x1-x2)*(x1-x2) + (y1+y2)*(y1+y2) );
if (aa+bb != 0.0)
clarity[i] = (int)(
( (x1+x2) * (x1-x2) + (y1+y2) * (y1-y2) )/(aa+bb) * 256 );
else
clarity[i] = 0;
}
// Asger Alstrupt's optimized 32 bit fade
// (alstrup@diku.dk)
/*unsigned long *ptr = (unsigned long*)output;
i = outWidth*outHeight*2/4;
do {
//Bytewize version was: *(ptr++) -= *ptr+(*ptr>>1)>>4;
if (*ptr)
if (*ptr & 0xf0f0f0f0ul)
*(ptr++) -= ((*ptr & 0xf0f0f0f0ul) >> 4) + ((*ptr & 0xe0e0e0e0ul) >> 5);
else {
*(ptr++) = (*ptr * 14 >> 4) & 0x0f0f0f0ful;
//Should be 29/32 to be consistent. Who cares. This is totally
// hacked anyway.
//unsigned char *subptr = (unsigned char*)(ptr++);
//subptr[0] = (int)subptr[0] * 29 / 32;
//subptr[1] = (int)subptr[0] * 29 / 32;
//subptr[2] = (int)subptr[0] * 29 / 32;
//subptr[3] = (int)subptr[0] * 29 / 32;
}
else
ptr++;
} while(--i > 0);
*/
int heightFactor = n/2 / outHeight + 1;
int actualHeight = n/2/heightFactor;
int heightAdd = outHeight + actualHeight >> 1;
/* Correct for window size */
double brightFactor2 = (brightFactor/65536.0/n)*
sqrt(actualHeight*outWidth/(320.0*200.0));
for(i=1;i<n/2;i++) {
//int h = (int)( b[i]*280 / (a[i]+b[i]+0.0001)+20 );
if (a[i] > 0 || b[i] > 0) {
int h = (int)( b[i]*outWidth / (a[i]+b[i]) );
int br1, br2, br = (int)(
(a[i]+b[i])*i*brightFactor2 );
br1 = br*(clarity[i]+128)>>8;
br2 = br*(128-clarity[i])>>8;
if (br1 < 0) br1 = 0; else if (br1 > 255) br1 = 255;
if (br2 < 0) br2 = 0; else if (br2 > 255) br2 = 255;
//unsigned char *p = output+ h*2+(164-((i<<8)>>m))*(outWidth*2);
int px = h,
py = heightAdd - i / heightFactor;
if (pointsAreDiamonds) {
addPixel(px,py,br1,br2);
br1=scaleDown[br1];br2=scaleDown[br2];
//TODO: Use addpixelfast
for(j=1;br1>0||br2>0;j++,br1=scaleDown[br1],br2=scaleDown[br2]) {
for(k=0;k<j;k++) {
addPixel(px-j+k,py-k,br1,br2);
addPixel(px+k,py-j+k,br1,br2);
addPixel(px+j-k,py+k,br1,br2);
addPixel(px-k,py+j-k,br1,br2);
}
}
} else {
if (px < maxStarRadius || py < maxStarRadius ||
px > outWidth-maxStarRadius || py > outHeight-maxStarRadius) {
addPixel(px,py,br1,br2);
for(j=1;br1>0||br2>0;j++,br1=scaleDown[br1],br2=scaleDown[br2]) {
addPixel(px+j,py,br1,br2);
addPixel(px,py+j,br1,br2);
addPixel(px-j,py,br1,br2);
addPixel(px,py-j,br1,br2);
}
} else {
unsigned char *p = ucoutput+px*2+py*outWidth*2, *p1=p, *p2=p, *p3=p, *p4=p;
addPixelFast(p,br1,br2);
for(;br1>0||br2>0;br1=scaleDown[br1],br2=scaleDown[br2]) {
p1 += 2;
addPixelFast(p1,br1,br2);
p2 -= 2;
addPixelFast(p2,br1,br2);
p3 += outWidth*2;
addPixelFast(p3,br1,br2);
p4 -= outWidth*2;
addPixelFast(p4,br1,br2);
}
}
}
}
}
return 0;
}