working on glitches

This commit is contained in:
le vieux 2020-11-15 21:31:02 +01:00
parent 1334d96822
commit fdc2544ad1
6 changed files with 90 additions and 4 deletions

3
.gitignore vendored
View File

@ -64,6 +64,9 @@ tools/*.png
tools/*.tiff
Fonderie/*.o
Fonderie/*.png
Fonderie/*.pnm
Fonderie/fonderie
Fonderie/interpolator
Fonderie/t

View File

@ -8,7 +8,12 @@ LIBS = ../libfloatimg.a -lpnglite -lm
OBJS = fonctions.o sfx.o crapulator.o glitches.o metriques.o
DEPS = fonctions.h crapulator.h metriques.h glitches.h
all: fonderie interpolator
all: fonderie interpolator t
# ---------------------------------------------------------
t: t.c Makefile glitches.o
gcc ${COPT} $< glitches.o ${LIBS} -lz -o $@
# ---------------------------------------------------------

View File

@ -117,6 +117,7 @@ int vertical_singlitch(FloatImg *picz, int xpos, float fval,
float omega, float phi)
{
int y, x, w, h;
double dy;
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %d %f %f )\n", __func__, picz,
@ -124,9 +125,13 @@ fprintf(stderr, ">>> %s ( %p %d %f %f )\n", __func__, picz,
#endif
h = picz->height; w = picz->width;
#define BB 12
#define BB 10
for (y=BB; y<h-BB; y++) {
x = xpos; /* add sinus deviation here */
dy = (double)y * omega;
x = xpos + (int)(10.9*sin(dy+phi)); /* add sinus deviation */
/* compute bounding box */
if ( (x>BB) && (x<w-BB) ) {
/* an make the glitch */

View File

@ -167,7 +167,7 @@ for (idx=0; idx<globbuf.gl_pathc; idx++) {
coef = (float)step / (float)Nsteps;
fimg_interpolate(pSecond, pFirst, &Out, coef);
/* here we can insert the output filter */
/* here we can insert the OUTPUT filter */
foo = crapulator(&Out, outfx, value);
if (foo) {
fprintf(stderr, "\nout fx %d crapulator failure %d\n",

65
Fonderie/t.c Normal file
View File

@ -0,0 +1,65 @@
/*
* test des trucs
*/
#include <stdio.h>
#include <stdlib.h>
#include "../floatimg.h"
#include "glitches.h"
/* ----------------------------------------------------------- */
int verbosity;
#define PNG "out.png"
#define W 512
#define H 256
#define LMAX 233.333
#define TIMER 1
int main(int argc, char *argv[])
{
int foo, iter, xloc, bloub;
FloatImg image;
char buff[1000];
double debut, fin;
float omega;
verbosity = 1;
fimg_print_version(1);
foo = fimg_create(&image, W, H, FIMG_TYPE_RGB);
if (foo) {
fprintf(stderr, "err %d create image\n", foo);
exit(1);
}
fimg_vdeg_a(&image, LMAX);
debut = fimg_timer_set(TIMER);
for (iter=0; iter<64; iter++) {
for (bloub=0; bloub<5; bloub++) {
xloc = rand() % W;
omega = (float)(0.1 + drand48()*0.8) * 0.5;
foo = vertical_singlitch(&image, xloc, LMAX,
omega, (float)iter);
if (foo) abort();
}
sprintf(buff, "out%03d.png", iter);
foo = fimg_save_as_png(&image, buff, 0);
if (foo) {
fprintf(stderr, "err %d saving to '%s'\n", foo, PNG);
exit(1);
}
}
fin = fimg_timer_set(TIMER);
fprintf(stderr, "elapsed %f\n", fin-debut);
return 0;
}
/* ----------------------------------------------------------- */

View File

@ -694,7 +694,15 @@ int fimg_killcolors_b(FloatImg *fimg, float fval);
int fimg_colors_mixer_a(FloatImg *fimg, float fval);
\end{lstlisting}
\subsection{Glitches}\index{glitch}
Un \textsl{glitch} peut-il être classé dans la catégorie des effets
spéciaux ou non ? \textsc{Hmha}, non. un fx est paramétrable
et surtout répétitif. Un glitch est quasiment souvbent un phénomène
aléatoire\index{drand48} et tout aussi paramétrable.
J'ai commencé à étudier ces objets étranges quand j'ai commencé
sur l'interpolator\index{interpolator} à l'automne 2020.
% ----------------------------------