From a450ac4291ee0828c275a894d7b68d7076a1b9b9 Mon Sep 17 00:00:00 2001
From: tonton th <sigfood@dinorama.fr>
Date: Wed, 2 Dec 2020 19:24:54 +0100
Subject: [PATCH] gliches++

---
 Fonderie/essai.sh   | 17 +++++++++++++++++
 Fonderie/glitches.c | 29 +++++++++++++++++++++++------
 Fonderie/t.c        | 19 +++++++++----------
 3 files changed, 49 insertions(+), 16 deletions(-)
 create mode 100755 Fonderie/essai.sh

diff --git a/Fonderie/essai.sh b/Fonderie/essai.sh
new file mode 100755
index 0000000..50d7ff3
--- /dev/null
+++ b/Fonderie/essai.sh
@@ -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
+
+
+
+
diff --git a/Fonderie/glitches.c b/Fonderie/glitches.c
index 7640d3d..45dd15d 100644
--- a/Fonderie/glitches.c
+++ b/Fonderie/glitches.c
@@ -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;
diff --git a/Fonderie/t.c b/Fonderie/t.c
index 6305381..ab47a28 100644
--- a/Fonderie/t.c
+++ b/Fonderie/t.c
@@ -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);