-/* xscreensaver, Copyright (c) 1993, 1995 Jamie Zawinski <jwz@netscape.com>
+/* xscreensaver, Copyright (c) 1993-2008 Jamie Zawinski <jwz@jwz.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
*/
/* This file was ported from xlock for use in xscreensaver (and standalone)
- * by jwz on 18-Oct-93. Original copyright reads:
+ * by jwz on 18-Oct-93. (And again, 11-May-97.) Original copyright reads:
*
* static char sccsid[] = "@(#)flame.c 1.4 91/09/27 XLOCK";
*
* Mountain View, CA 94043
*
* Revision History:
+ * 01-Jun-95: This should look more like the original with some updates by
+ * Scott Draves.
* 27-Jun-91: vary number of functions used.
* 24-Jun-91: fixed portability problem with integer mod (%).
- * 06-Jun-91: Written. (received from Scott Graves, spot@cs.cmu.edu).
+ * 06-Jun-91: Written. (received from Scott Draves, spot@cs.cmu.edu).
*/
+#include <math.h>
#include "screenhack.h"
+#include <signal.h> /* so we can ignore SIGFPE */
+
#define POINT_BUFFER_SIZE 10
#define MAXLEV 4
+#define MAXKINDS 10
+
+struct state {
+ Display *dpy;
+ Window window;
+
+ double f[2][3][MAXLEV]; /* three non-homogeneous transforms */
+ int max_total;
+ int max_levels;
+ int max_points;
+ int cur_level;
+ int variation;
+ int snum;
+ int anum;
+ int num_points;
+ int total_points;
+ int pixcol;
+ int ncolors;
+ XColor *colors;
+ XPoint points [POINT_BUFFER_SIZE];
+ GC gc;
+
+ int delay, delay2;
+ int width, height;
+
+ short lasthalf;
+
+ int flame_alt;
+ int do_reset;
+};
-static double f[2][3][MAXLEV]; /* three non-homogeneous transforms */
-static int max_total;
-static int max_levels;
-static int max_points;
-static int cur_level;
-static int snum;
-static int anum;
-static int num_points;
-static int total_points;
-static int pixcol;
-static int npixels;
-static unsigned long *pixels;
-static XPoint points [POINT_BUFFER_SIZE];
-static GC gc;
-
-static int delay, delay2;
-static int width, height;
static short
-halfrandom (mv)
- int mv;
+halfrandom (struct state *st, int mv)
{
- static short lasthalf = 0;
unsigned long r;
- if (lasthalf)
+ if (st->lasthalf)
{
- r = lasthalf;
- lasthalf = 0;
+ r = st->lasthalf;
+ st->lasthalf = 0;
}
else
{
r = random ();
- lasthalf = r >> 16;
+ st->lasthalf = r >> 16;
}
return (r % mv);
}
-
-static void
-init_flame (dpy, window)
- Display *dpy;
- Window window;
+static void *
+flame_init (Display *dpy, Window window)
{
+ struct state *st = (struct state *) calloc (1, sizeof(*st));
XGCValues gcv;
XWindowAttributes xgwa;
Colormap cmap;
- XGetWindowAttributes (dpy, window, &xgwa);
- width = xgwa.width;
- height = xgwa.height;
+
+ st->dpy = dpy;
+ st->window = window;
+
+#if defined(SIGFPE) && defined(SIG_IGN)
+ /* No doubt a better fix would be to track down where the NaN is coming
+ from, and code around that; but this should do. Apparently most systems
+ (Linux, Solaris, Irix, ...) ignore FPE by default -- but FreeBSD dumps
+ core by default. */
+ signal (SIGFPE, SIG_IGN);
+#endif
+
+ XGetWindowAttributes (st->dpy, st->window, &xgwa);
+ st->width = xgwa.width;
+ st->height = xgwa.height;
cmap = xgwa.colormap;
- max_points = get_integer_resource ("iterations", "Integer");
- if (max_points <= 0) max_points = 100;
+ st->max_points = get_integer_resource (st->dpy, "iterations", "Integer");
+ if (st->max_points <= 0) st->max_points = 100;
- max_levels = max_points;
+ st->max_levels = st->max_points;
- max_total = get_integer_resource ("points", "Integer");
- if (max_total <= 0) max_total = 10000;
+ st->max_total = get_integer_resource (st->dpy, "points", "Integer");
+ if (st->max_total <= 0) st->max_total = 10000;
- delay = get_integer_resource ("delay", "Integer");
- if (delay < 0) delay = 0;
- delay2 = get_integer_resource ("delay2", "Integer");
- if (delay2 < 0) delay2 = 0;
+ st->delay = get_integer_resource (st->dpy, "delay", "Integer");
+ if (st->delay < 0) st->delay = 0;
+ st->delay2 = get_integer_resource (st->dpy, "delay2", "Integer");
+ if (st->delay2 < 0) st->delay2 = 0;
+
+ st->variation = random() % MAXKINDS;
if (mono_p)
- npixels = 0;
+ st->ncolors = 0;
else
{
- int i = get_integer_resource ("ncolors", "Integer");
- double saturation = 1.0;
- double value = 1.0;
- XColor color;
- if (i <= 0) i = 128;
-
- pixels = (unsigned long *) malloc ((i+1) * sizeof (*pixels));
- for (npixels = 0; npixels < i; npixels++)
- {
- hsv_to_rgb ((360*npixels)/i, saturation, value,
- &color.red, &color.green, &color.blue);
- if (! XAllocColor (dpy, cmap, &color))
- break;
- pixels [npixels] = color.pixel;
- }
+ st->ncolors = get_integer_resource (st->dpy, "colors", "Integer");
+ if (st->ncolors <= 0) st->ncolors = 128;
+ st->colors = (XColor *) malloc ((st->ncolors+1) * sizeof (*st->colors));
+ make_smooth_colormap (st->dpy, xgwa.visual, xgwa.colormap, st->colors, &st->ncolors,
+ True, 0, True);
+ if (st->ncolors <= 2)
+ mono_p = True, st->ncolors = 0;
}
- gcv.foreground = get_pixel_resource ("foreground", "Foreground", dpy, cmap);
- gcv.background = get_pixel_resource ("background", "Background", dpy, cmap);
+ gcv.foreground = get_pixel_resource (st->dpy, cmap, "foreground", "Foreground");
+ gcv.background = get_pixel_resource (st->dpy, cmap, "background", "Background");
if (! mono_p)
{
- pixcol = halfrandom (npixels);
- gcv.foreground = (pixels [pixcol]);
+ st->pixcol = halfrandom (st, st->ncolors);
+ gcv.foreground = (st->colors [st->pixcol].pixel);
}
- gc = XCreateGC (dpy, window, GCForeground | GCBackground, &gcv);
+ st->gc = XCreateGC (st->dpy, st->window, GCForeground | GCBackground, &gcv);
+ return st;
}
static int
-recurse (x, y, l, dpy, win)
- register double x, y;
- register int l;
- Display *dpy;
- Window win;
+recurse (struct state *st, double x, double y, int l, Display *dpy, Window win)
{
- int xp, yp, i;
+ int /*xp, yp,*/ i;
double nx, ny;
- if (l == max_levels)
+ if (l == st->max_levels)
{
- total_points++;
- if (total_points > max_total) /* how long each fractal runs */
+ st->total_points++;
+ if (st->total_points > st->max_total) /* how long each fractal runs */
return 0;
if (x > -1.0 && x < 1.0 && y > -1.0 && y < 1.0)
{
- xp = points[num_points].x = (int) ((width / 2) * (x + 1.0));
- yp = points[num_points].y = (int) ((height / 2) * (y + 1.0));
- num_points++;
- if (num_points >= POINT_BUFFER_SIZE)
+/* xp = st->points[st->num_points].x = (int) ((st->width / 2) * (x + 1.0));
+ yp = st->points[st->num_points].y = (int) ((st->height / 2) * (y + 1.0));*/
+ st->num_points++;
+ if (st->num_points >= POINT_BUFFER_SIZE)
{
- XDrawPoints (dpy, win, gc, points, num_points, CoordModeOrigin);
- num_points = 0;
- /* if (delay) usleep (delay); */
- /* XSync (dpy, True); */
+ XDrawPoints (st->dpy, win, st->gc, st->points, st->num_points, CoordModeOrigin);
+ st->num_points = 0;
}
}
}
else
{
- for (i = 0; i < snum; i++)
+ for (i = 0; i < st->snum; i++)
{
- nx = f[0][0][i] * x + f[0][1][i] * y + f[0][2][i];
- ny = f[1][0][i] * x + f[1][1][i] * y + f[1][2][i];
- if (i < anum)
+
+ /* Scale back when values get very large. Spot sez:
+ "I think this happens on HPUX. I think it's non-IEEE
+ to generate an exception instead of a silent NaN."
+ */
+ if ((abs(x) > 1.0E5) || (abs(y) > 1.0E5))
+ x = x / y;
+
+ nx = st->f[0][0][i] * x + st->f[0][1][i] * y + st->f[0][2][i];
+ ny = st->f[1][0][i] * x + st->f[1][1][i] * y + st->f[1][2][i];
+ if (i < st->anum)
{
- nx = sin(nx);
- ny = sin(ny);
+ switch (st->variation)
+ {
+ case 0: /* sinusoidal */
+ nx = sin(nx);
+ ny = sin(ny);
+ break;
+ case 1: /* complex */
+ {
+ double r2 = nx * nx + ny * ny + 1e-6;
+ nx = nx / r2;
+ ny = ny / r2;
+ }
+ break;
+ case 2: /* bent */
+ if (nx < 0.0)
+ nx = nx * 2.0;
+ if (ny < 0.0)
+ ny = ny / 2.0;
+ break;
+ case 3: /* swirl */
+ {
+ double r = (nx * nx + ny * ny); /* times k here is fun */
+ double c1 = sin(r);
+ double c2 = cos(r);
+ double t = nx;
+
+ if (nx > 1e4 || nx < -1e4 || ny > 1e4 || ny < -1e4)
+ ny = 1e4;
+ else
+ ny = c2 * t + c1 * ny;
+ nx = c1 * nx - c2 * ny;
+ }
+ break;
+ case 4: /* horseshoe */
+ {
+ double r, c1, c2, t;
+
+ /* Avoid atan2: DOMAIN error message */
+ if (nx == 0.0 && ny == 0.0)
+ r = 0.0;
+ else
+ r = atan2(nx, ny); /* times k here is fun */
+ c1 = sin(r);
+ c2 = cos(r);
+ t = nx;
+
+ nx = c1 * nx - c2 * ny;
+ ny = c2 * t + c1 * ny;
+ }
+ break;
+ case 5: /* drape */
+ {
+ double t;
+
+ /* Avoid atan2: DOMAIN error message */
+ if (nx == 0.0 && ny == 0.0)
+ t = 0.0;
+ else
+ t = atan2(nx, ny) / M_PI;
+
+ if (nx > 1e4 || nx < -1e4 || ny > 1e4 || ny < -1e4)
+ ny = 1e4;
+ else
+ ny = sqrt(nx * nx + ny * ny) - 1.0;
+ nx = t;
+ }
+ break;
+ case 6: /* broken */
+ if (nx > 1.0)
+ nx = nx - 1.0;
+ if (nx < -1.0)
+ nx = nx + 1.0;
+ if (ny > 1.0)
+ ny = ny - 1.0;
+ if (ny < -1.0)
+ ny = ny + 1.0;
+ break;
+ case 7: /* spherical */
+ {
+ double r = 0.5 + sqrt(nx * nx + ny * ny + 1e-6);
+
+ nx = nx / r;
+ ny = ny / r;
+ }
+ break;
+ case 8: /* */
+ nx = atan(nx) / M_PI_2;
+ ny = atan(ny) / M_PI_2;
+ break;
+/* #if 0 */ /* core dumps on some machines, why not all? */
+ case 9: /* complex sine */
+ {
+ double u = nx;
+ double v = ny;
+ double ev = exp(v);
+ double emv = exp(-v);
+
+ nx = (ev + emv) * sin(u) / 2.0;
+ ny = (ev - emv) * cos(u) / 2.0;
+ }
+ break;
+ case 10: /* polynomial */
+ if (nx < 0)
+ nx = -nx * nx;
+ else
+ nx = nx * nx;
+ if (ny < 0)
+ ny = -ny * ny;
+ else
+ ny = ny * ny;
+ break;
+/* #endif */
+ default:
+ nx = sin(nx);
+ ny = sin(ny);
+ }
}
- if (!recurse (nx, ny, l + 1, dpy, win))
+ if (!recurse (st, nx, ny, l + 1, st->dpy, win))
return 0;
}
}
return 1;
}
-
-static void
-flame (dpy, window)
- Display *dpy;
- Window window;
+static unsigned long
+flame_draw (Display *dpy, Window window, void *closure)
{
+ struct state *st = (struct state *) closure;
int i, j, k;
- static int alt = 0;
+ unsigned long this_delay = st->delay;
- if (!(cur_level++ % max_levels))
+ if (st->do_reset)
{
- if (delay2) usleep (delay2);
- XClearWindow (dpy, window);
- alt = !alt;
+ st->do_reset = 0;
+ XClearWindow (st->dpy, st->window);
+ }
+
+ if (!(st->cur_level++ % st->max_levels))
+ {
+ st->do_reset = 1;
+ this_delay = st->delay2;
+ st->flame_alt = !st->flame_alt;
+ st->variation = random() % MAXKINDS;
}
else
{
- if (npixels > 2)
+ if (st->ncolors > 2)
{
- XSetForeground (dpy, gc, pixels [pixcol]);
- if (--pixcol < 0)
- pixcol = npixels - 1;
+ XSetForeground (st->dpy, st->gc, st->colors [st->pixcol].pixel);
+ if (--st->pixcol < 0)
+ st->pixcol = st->ncolors - 1;
}
}
/* number of functions */
- snum = 2 + (cur_level % (MAXLEV - 1));
+ st->snum = 2 + (st->cur_level % (MAXLEV - 1));
/* how many of them are of alternate form */
- if (alt)
- anum = 0;
+ if (st->flame_alt)
+ st->anum = 0;
else
- anum = halfrandom (snum) + 2;
+ st->anum = halfrandom (st, st->snum) + 2;
/* 6 coefs per function */
- for (k = 0; k < snum; k++)
+ for (k = 0; k < st->snum; k++)
{
for (i = 0; i < 2; i++)
for (j = 0; j < 3; j++)
- f[i][j][k] = ((double) (random() & 1023) / 512.0 - 1.0);
+ st->f[i][j][k] = ((double) (random() & 1023) / 512.0 - 1.0);
}
- num_points = 0;
- total_points = 0;
- (void) recurse (0.0, 0.0, 0, dpy, window);
- XDrawPoints (dpy, window, gc, points, num_points, CoordModeOrigin);
- XSync (dpy, True);
- if (delay) usleep (delay);
+ st->num_points = 0;
+ st->total_points = 0;
+ recurse (st, 0.0, 0.0, 0, st->dpy, st->window);
+ XDrawPoints (st->dpy, st->window, st->gc, st->points, st->num_points, CoordModeOrigin);
+
+ return this_delay;
}
-#ifdef __hpux
+#if defined(__hpux) && defined(PLOSS)
/* I don't understand why this is necessary, but I'm told that this program
does nothing at all on HP-sUX without it.
+
+ I'm further told that HPUX 11.0 doesn't define PLOSS, and works ok without
+ this section. Go figure.
*/
#undef random
#undef srandom
\f
-char *progclass = "Flame";
-
-char *defaults [] = {
- "Flame.background: black", /* to placate SGI */
- "Flame.foreground: white",
- "*colors: 128",
+static const char *flame_defaults [] = {
+ ".background: black",
+ ".foreground: white",
+ "*fpsSolid: true",
+ "*colors: 64",
"*iterations: 25",
"*delay: 50000",
"*delay2: 2000000",
0
};
-XrmOptionDescRec options [] = {
- { "-ncolors", ".colors", XrmoptionSepArg, 0 },
+static XrmOptionDescRec flame_options [] = {
+ { "-colors", ".colors", XrmoptionSepArg, 0 },
{ "-iterations", ".iterations", XrmoptionSepArg, 0 },
{ "-delay", ".delay", XrmoptionSepArg, 0 },
{ "-delay2", ".delay2", XrmoptionSepArg, 0 },
- { "-points", ".points", XrmoptionSepArg, 0 }
+ { "-points", ".points", XrmoptionSepArg, 0 },
+ { 0, 0, 0, 0 }
};
-int options_size = (sizeof (options) / sizeof (options[0]));
-void
-screenhack (dpy, window)
- Display *dpy;
- Window window;
+static void
+flame_reshape (Display *dpy, Window window, void *closure,
+ unsigned int w, unsigned int h)
{
- init_flame (dpy, window);
- while (1)
- flame (dpy, window);
}
+
+static Bool
+flame_event (Display *dpy, Window window, void *closure, XEvent *event)
+{
+ return False;
+}
+
+static void
+flame_free (Display *dpy, Window window, void *closure)
+{
+ struct state *st = (struct state *) closure;
+ free (st);
+}
+
+XSCREENSAVER_MODULE ("Flame", flame)
+
projects / xscreensaver / blobdiff