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gliches++

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Tonton Th 2020-12-02 19:24:54 +01:00
parent a587a66af8
commit a450ac4291
3 changed files with 49 additions and 16 deletions
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17
Fonderie/essai.sh Executable file
View File

@ -0,0 +1,17 @@
#!/bin/bash
OUTF='/tmp/out_a*.png'
rm $OUTF
make t && ./t
A_PART=$(ls -1 $OUTF)
Z_PART=$(ls -r1 $OUTF)
convert -delay 10 ${A_PART} ${Z_PART} foo.gif

29
Fonderie/glitches.c
View File

@ -113,11 +113,26 @@ int poke_a_random_pixel(FloatImg *picz, float fval, int kaboo)
return -1;
}
/* -------------------------------------------------------------- */
/*
* used by vertical_singlitch()
*/
int x_delta(float dy, float phy)
{
float param, fv;
param = dy + phy;
fv = 9.999*sin(param) + 6.666*sin(param*3) + 3.333*sin(param*5);
return (int)fv;
}
/* -------------------------------------------------------------- */
/*
* please explain arguments
*/
int vertical_singlitch(FloatImg *picz, int xpos, float fval,
float omega, float phi)
{
int y, x, w, h;
double dy;
float dy;
float fv;
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %d %f %f )\n", __func__, picz,
@ -125,21 +140,23 @@ fprintf(stderr, ">>> %s ( %p %d %f %f )\n", __func__, picz,
#endif
h = picz->height; w = picz->width;
#define BB 10
#define BB 4
for (y=BB; y<h-BB; y++) {
dy = (double)y * omega;
dy = (float)y * omega; /* normalize vertical position */
x = xpos + (int)(10.9*sin(dy+phi)); /* add sinus deviation */
x = xpos + x_delta(dy, phi); /* add sinus deviation */
/* compute bounding box */
if ( (x>BB) && (x<w-BB) ) {
/* an make the glitch */
fimg_plot_rgb(picz, x, y, fval, fval, fval);
fv = fval / 3.0;
if (rand() & 8)
fimg_plot_rgb(picz, x-1, y, 0.0, 0.0, 0.0);
fimg_plot_rgb(picz, x-1, y, fv, fv, fv);
if (rand() & 8)
fimg_plot_rgb(picz, x+1, y, 0.0, 0.0, 0.0);
// XXX else
fimg_plot_rgb(picz, x+1, y, fv, fv, fv);
}
}
return 0;

19
Fonderie/t.c
View File

@ -8,6 +8,7 @@
#include "../floatimg.h"
#include "glitches.h"
#include "sfx.h"
/* ----------------------------------------------------------- */
@ -15,13 +16,10 @@ int verbosity;
#define PNG "out.png"
#define W 512
#define H 512
#define LMAX 233.333
#define H 256
#define LMAX 249.9999
#define TIMER 1
int trinarize(FloatImg *pimg, int notused); // in sfx.c
int main(int argc, char *argv[])
{
int foo, iter, xloc, bloub;
@ -40,16 +38,16 @@ if (foo) {
exit(1);
}
fimg_printhead(&image);
// fimg_printhead(&image);
srand(getpid());
debut = fimg_timer_set(TIMER);
for (iter=0; iter<16; iter++) {
fimg_hdeg_a(&image, LMAX);
fimg_vdeg_a(&image, LMAX);
for (iter=0; iter<32; iter++) {
for (bloub=0; bloub<16; bloub++) {
for (bloub=0; bloub<6; bloub++) {
xloc = rand() % W;
omega = (float)(0.1 + drand48()*0.6) * 0.4;
foo = vertical_singlitch(&image, xloc, LMAX,
@ -64,6 +62,7 @@ for (iter=0; iter<16; iter++) {
exit(1);
}
#if 0
foo = trinarize(&image, 0); /* XXX */
sprintf(buff, "/tmp/out_b%03d.png", iter);
@ -72,7 +71,7 @@ for (iter=0; iter<16; iter++) {
fprintf(stderr, "err %d saving to '%s'\n", foo, buff);
exit(1);
}
#endif
}
fin = fimg_timer_set(TIMER);