/* petri, simulate mold in a petri dish. v2.7
* by Dan Bornstein, danfuzz@milk.com
* with help from Jamie Zawinski, jwz@jwz.org
* Copyright (c) 1992-1999 Dan Bornstein.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*
*
* Brief description of options/resources:
*
* delay: the delay in microseconds between iterations
* size: the size of a cell in pixels
* count: the number of different kinds of mold (minimum: 2)
* diaglim: the age limit for diagonal growth as a multiplier of orthogonal
* growth (minimum: 1, maximum 2). 1 means square growth, 1.414
* (i.e., sqrt(2)) means approximately circular growth, 2 means diamond
* growth.
* anychan: the chance (fraction, between 0 and 1) that at each iteration,
* any new cell will be born
* minorchan: the chance (fraction, between 0 and 1) that, given that new
* cells will be added, that only two will be added (a minor cell birth
* event)
* instantdeathchan: the chance (fraction, between 0 and 1) that, given
* that death and destruction will happen, that instead of using plague
* cells, death will be instantaneous
* minlifespan: the minimum lifespan of a colony (before black death ensues)
* maxlifespan: the maximum lifespan of a colony (before black death ensues)
* minlifespeed: the minimum speed for living cells as a fraction of the
* maximum possible speed (fraction, between 0 and 1)
* maxlifespeed: the maximum speed for living cells as a fraction of the
* maximum possible speed (fraction, between 0 and 1)
* mindeathspeed: the minimum speed for black death cells as a fraction of the
* maximum possible speed (fraction, between 0 and 1)
* maxdeathspeed: the maximum speed for black death cells as a fraction of the
* maximum possible speed (fraction, between 0 and 1)
* originalcolors: if true, count must be 8 or less and the colors are a
* fixed set of primary and secondary colors (the artist's original choices)
*
* Interesting settings:
*
* petri -originalcolors -size 8
* petri -size 2
* petri -size 8 -diaglim 1.8
* petri -diaglim 1.1
*
* petri -count 4 -anychan 0.01 -minorchan 1 \
* -minlifespan 2000 -maxlifespan 5000
*
* petri -count 3 -anychan 1 -minlifespan 100000 \
* -instantdeathchan 0
*
* petri -minlifespeed 0.02 -maxlifespeed 0.03 -minlifespan 1 \
* -maxlifespan 1 -instantdeathchan 0 -minorchan 0 \
* -anychan 0.3 -delay 4000
*/
#include <math.h>
#include "screenhack.h"
#include "spline.h"
#define FLOAT float
#define RAND_FLOAT (((FLOAT) (random() & 0xffff)) / ((FLOAT) 0x10000))
typedef struct cell_s
{
unsigned char col; /* 0 */
unsigned char isnext; /* 1 */
unsigned char nextcol; /* 2 */
/* 3 */
struct cell_s *next; /* 4 */
struct cell_s *prev; /* 8 - */
FLOAT speed; /* 12 */
FLOAT growth; /* 16 20 - */
FLOAT nextspeed; /* 20 28 */
/* 24 36 - */
} cell;
struct state {
Display *dpy;
Window window;
int arr_width;
int arr_height;
int count;
cell *arr;
cell *head;
cell *tail;
int blastcount;
GC *coloredGCs;
int windowWidth;
int windowHeight;
int xOffset;
int yOffset;
int xSize;
int ySize;
FLOAT orthlim;
FLOAT diaglim;
FLOAT anychan;
FLOAT minorchan;
FLOAT instantdeathchan;
int minlifespan;
int maxlifespan;
FLOAT minlifespeed;
FLOAT maxlifespeed;
FLOAT mindeathspeed;
FLOAT maxdeathspeed;
Bool originalcolors;
int warned;
int delay;
};
#define cell_x(c) (st->arr_width ? ((c) - st->arr) % st->arr_width : 0)
#define cell_y(c) (st->arr_width ? ((c) - st->arr) / st->arr_width : 0)
static int random_life_value (struct state *st)
{
return (int) ((RAND_FLOAT * (st->maxlifespan - st->minlifespan)) + st->minlifespan);
}
static void setup_random_colormap (struct state *st, XWindowAttributes *xgwa)
{
XGCValues gcv;
int lose = 0;
int ncolors = st->count - 1;
int n;
XColor *colors = (XColor *) calloc (sizeof(*colors), st->count*2);
colors[0].pixel = get_pixel_resource (st->dpy, xgwa->colormap,
"background", "Background");
make_random_colormap (xgwa->screen, xgwa->visual, xgwa->colormap,
colors+1, &ncolors, True, True, 0, True);
if (ncolors < 1)
{
fprintf (stderr, "%s: couldn't allocate any colors\n", progname);
exit (-1);
}
ncolors++;
st->count = ncolors;
memcpy (colors + st->count, colors, st->count * sizeof(*colors));
colors[st->count].pixel = get_pixel_resource (st->dpy, xgwa->colormap,
"foreground", "Foreground");
for (n = 1; n < st->count; n++)
{
int m = n + st->count;
colors[n].red = colors[m].red / 2;
colors[n].green = colors[m].green / 2;
colors[n].blue = colors[m].blue / 2;
if (!XAllocColor (st->dpy, xgwa->colormap, &colors[n]))
{
lose++;
colors[n] = colors[m];
}
}
if (lose)
{
fprintf (stderr,
"%s: unable to allocate %d half-intensity colors.\n",
progname, lose);
}
for (n = 0; n < st->count*2; n++)
{
gcv.foreground = colors[n].pixel;
st->coloredGCs[n] = XCreateGC (st->dpy, st->window, GCForeground, &gcv);
}
free (colors);
}
static void setup_original_colormap (struct state *st, XWindowAttributes *xgwa)
{
XGCValues gcv;
int lose = 0;
int n;
XColor *colors = (XColor *) calloc (sizeof(*colors), st->count*2);
colors[0].pixel = get_pixel_resource (st->dpy, xgwa->colormap,
"background", "Background");
colors[st->count].pixel = get_pixel_resource (st->dpy, xgwa->colormap,
"foreground", "Foreground");
for (n = 1; n < st->count; n++)
{
int m = n + st->count;
colors[n].red = ((n & 0x01) != 0) * 0x8000;
colors[n].green = ((n & 0x02) != 0) * 0x8000;
colors[n].blue = ((n & 0x04) != 0) * 0x8000;
if (!XAllocColor (st->dpy, xgwa->colormap, &colors[n]))
{
lose++;
colors[n] = colors[0];
}
colors[m].red = colors[n].red + 0x4000;
colors[m].green = colors[n].green + 0x4000;
colors[m].blue = colors[n].blue + 0x4000;
if (!XAllocColor (st->dpy, xgwa->colormap, &colors[m]))
{
lose++;
colors[m] = colors[st->count];
}
}
if (lose)
{
fprintf (stderr,
"%s: unable to allocate %d colors.\n",
progname, lose);
}
for (n = 0; n < st->count*2; n++)
{
gcv.foreground = colors[n].pixel;
st->coloredGCs[n] = XCreateGC (st->dpy, st->window, GCForeground, &gcv);
}
free (colors);
}
static void
setup_display (struct state *st)
{
XWindowAttributes xgwa;
int cell_size = get_integer_resource (st->dpy, "size", "Integer");
int osize, alloc_size;
#if 0
int oalloc;
#endif
int mem_throttle = 0;
char *s;
if (cell_size < 1) cell_size = 1;
osize = cell_size;
s = get_string_resource (st->dpy, "memThrottle", "MemThrottle");
if (s)
{
int n;
char c;
if (1 == sscanf (s, " %d M %c", &n, &c) ||
1 == sscanf (s, " %d m %c", &n, &c))
mem_throttle = n * (1 << 20);
else if (1 == sscanf (s, " %d K %c", &n, &c) ||
1 == sscanf (s, " %d k %c", &n, &c))
mem_throttle = n * (1 << 10);
else if (1 == sscanf (s, " %d %c", &n, &c))
mem_throttle = n;
else
{
fprintf (stderr, "%s: invalid memThrottle \"%s\" (try \"10M\")\n",
progname, s);
exit (1);
}
free (s);
}
XGetWindowAttributes (st->dpy, st->window, &xgwa);
st->originalcolors = get_boolean_resource (st->dpy, "originalcolors", "Boolean");
st->count = get_integer_resource (st->dpy, "count", "Integer");
if (st->count < 2) st->count = 2;
/* number of colors can't be greater than the half depth of the screen. */
if (st->count > (unsigned int) (1L << (xgwa.depth-1)))
st->count = (unsigned int) (1L << (xgwa.depth-1));
/* Actually, since cell->col is of type char, this has to be small. */
if (st->count >= (unsigned int) (1L << ((sizeof(st->arr[0].col) * 8) - 1)))
st->count = (unsigned int) (1L << ((sizeof(st->arr[0].col) * 8) - 1));
if (st->originalcolors && (st->count > 8))
{
st->count = 8;
}
st->coloredGCs = (GC *) calloc (sizeof(GC), st->count * 2);
st->diaglim = get_float_resource (st->dpy, "diaglim", "Float");
if (st->diaglim < 1.0)
{
st->diaglim = 1.0;
}
else if (st->diaglim > 2.0)
{
st->diaglim = 2.0;
}
st->diaglim *= st->orthlim;
st->anychan = get_float_resource (st->dpy, "anychan", "Float");
if (st->anychan < 0.0)
{
st->anychan = 0.0;
}
else if (st->anychan > 1.0)
{
st->anychan = 1.0;
}
st->minorchan = get_float_resource (st->dpy, "minorchan","Float");
if (st->minorchan < 0.0)
{
st->minorchan = 0.0;
}
else if (st->minorchan > 1.0)
{
st->minorchan = 1.0;
}
st->instantdeathchan = get_float_resource (st->dpy, "instantdeathchan","Float");
if (st->instantdeathchan < 0.0)
{
st->instantdeathchan = 0.0;
}
else if (st->instantdeathchan > 1.0)
{
st->instantdeathchan = 1.0;
}
st->minlifespan = get_integer_resource (st->dpy, "minlifespan", "Integer");
if (st->minlifespan < 1)
{
st->minlifespan = 1;
}
st->maxlifespan = get_integer_resource (st->dpy, "maxlifespan", "Integer");
if (st->maxlifespan < st->minlifespan)
{
st->maxlifespan = st->minlifespan;
}
st->minlifespeed = get_float_resource (st->dpy, "minlifespeed", "Float");
if (st->minlifespeed < 0.0)
{
st->minlifespeed = 0.0;
}
else if (st->minlifespeed > 1.0)
{
st->minlifespeed = 1.0;
}
st->maxlifespeed = get_float_resource (st->dpy, "maxlifespeed", "Float");
if (st->maxlifespeed < st->minlifespeed)
{
st->maxlifespeed = st->minlifespeed;
}
else if (st->maxlifespeed > 1.0)
{
st->maxlifespeed = 1.0;
}
st->mindeathspeed = get_float_resource (st->dpy, "mindeathspeed", "Float");
if (st->mindeathspeed < 0.0)
{
st->mindeathspeed = 0.0;
}
else if (st->mindeathspeed > 1.0)
{
st->mindeathspeed = 1.0;
}
st->maxdeathspeed = get_float_resource (st->dpy, "maxdeathspeed", "Float");
if (st->maxdeathspeed < st->mindeathspeed)
{
st->maxdeathspeed = st->mindeathspeed;
}
else if (st->maxdeathspeed > 1.0)
{
st->maxdeathspeed = 1.0;
}
st->minlifespeed *= st->diaglim;
st->maxlifespeed *= st->diaglim;
st->mindeathspeed *= st->diaglim;
st->maxdeathspeed *= st->diaglim;
st->windowWidth = xgwa.width;
st->windowHeight = xgwa.height;
st->arr_width = st->windowWidth / cell_size;
st->arr_height = st->windowHeight / cell_size;
alloc_size = sizeof(cell) * st->arr_width * st->arr_height;
# if 0
oalloc = alloc_size;
# endif
if (mem_throttle > 0)
while (cell_size < st->windowWidth/10 &&
cell_size < st->windowHeight/10 &&
alloc_size > mem_throttle)
{
cell_size++;
st->arr_width = st->windowWidth / cell_size;
st->arr_height = st->windowHeight / cell_size;
alloc_size = sizeof(cell) * st->arr_width * st->arr_height;
}
if (osize != cell_size)
{
# if 0
if (!st->warned)
{
fprintf (stderr,
"%s: throttling cell size from %d to %d because of %dM limit.\n",
progname, osize, cell_size, mem_throttle / (1 << 20));
fprintf (stderr, "%s: %dx%dx%d = %.1fM, %dx%dx%d = %.1fM.\n",
progname,
st->windowWidth, st->windowHeight, osize,
((float) oalloc) / (1 << 20),
st->windowWidth, st->windowHeight, cell_size,
((float) alloc_size) / (1 << 20));
st->warned = 1;
}
# endif
}
st->xSize = st->arr_width ? st->windowWidth / st->arr_width : 0;
st->ySize = st->arr_height ? st->windowHeight / st->arr_height : 0;
if (st->xSize > st->ySize)
{
st->xSize = st->ySize;
}
else
{
st->ySize = st->xSize;
}
st->xOffset = (st->windowWidth - (st->arr_width * st->xSize)) / 2;
st->yOffset = (st->windowHeight - (st->arr_height * st->ySize)) / 2;
if (st->originalcolors)
{
setup_original_colormap (st, &xgwa);
}
else
{
setup_random_colormap (st, &xgwa);
}
}
static void drawblock (struct state *st, int x, int y, unsigned char c)
{
if (st->xSize == 1 && st->ySize == 1)
XDrawPoint (st->dpy, st->window, st->coloredGCs[c], x + st->xOffset, y + st->yOffset);
else
XFillRectangle (st->dpy, st->window, st->coloredGCs[c],
x * st->xSize + st->xOffset, y * st->ySize + st->yOffset,
st->xSize, st->ySize);
}
static void setup_arr (struct state *st)
{
int x, y;
if (st->arr != NULL)
{
free (st->arr);
}
XFillRectangle (st->dpy, st->window, st->coloredGCs[0], 0, 0,
st->windowWidth, st->windowHeight);
if (!st->arr_width) st->arr_width = 1;
if (!st->arr_height) st->arr_height = 1;
st->arr = (cell *) calloc (sizeof(cell), st->arr_width * st->arr_height);
if (!st->arr)
{
fprintf (stderr, "%s: out of memory allocating %dx%d grid\n",
progname, st->arr_width, st->arr_height);
exit (1);
}
for (y = 0; y < st->arr_height; y++)
{
int row = y * st->arr_width;
for (x = 0; x < st->arr_width; x++)
{
st->arr[row+x].speed = 0.0;
st->arr[row+x].growth = 0.0;
st->arr[row+x].col = 0;
st->arr[row+x].isnext = 0;
st->arr[row+x].next = 0;
st->arr[row+x].prev = 0;
}
}
if (st->head == NULL)
{
st->head = (cell *) malloc (sizeof (cell));
}
if (st->tail == NULL)
{
st->tail = (cell *) malloc (sizeof (cell));
}
st->head->next = st->tail;
st->head->prev = st->head;
st->tail->next = st->tail;
st->tail->prev = st->head;
st->blastcount = random_life_value (st);
}
static void newcell (struct state *st, cell *c, unsigned char col, FLOAT sp)
{
if (! c) return;
if (c->col == col) return;
c->nextcol = col;
c->nextspeed = sp;
c->isnext = 1;
if (c->prev == 0) {
c->next = st->head->next;
c->prev = st->head;
st->head->next = c;
c->next->prev = c;
}
}
static void killcell (struct state *st, cell *c)
{
c->prev->next = c->next;
c->next->prev = c->prev;
c->prev = 0;
c->speed = 0.0;
drawblock (st, cell_x(c), cell_y(c), c->col);
}
static void randblip (struct state *st, int doit)
{
int n;
int b = 0;
if (!doit
&& (st->blastcount-- >= 0)
&& (RAND_FLOAT > st->anychan))
{
return;
}
if (st->blastcount < 0)
{
b = 1;
n = 2;
st->blastcount = random_life_value (st);
if (RAND_FLOAT < st->instantdeathchan)
{
/* clear everything every so often to keep from getting into a
* rut */
setup_arr (st);
b = 0;
}
}
else if (RAND_FLOAT <= st->minorchan)
{
n = 2;
}
else
{
n = random () % 3 + 3;
}
while (n--)
{
int x = st->arr_width ? random () % st->arr_width : 0;
int y = st->arr_height ? random () % st->arr_height : 0;
int c;
FLOAT s;
if (b)
{
c = 0;
s = RAND_FLOAT * (st->maxdeathspeed - st->mindeathspeed) + st->mindeathspeed;
}
else
{
c = ((st->count - 1) ? random () % (st->count-1) : 0) + 1;
s = RAND_FLOAT * (st->maxlifespeed - st->minlifespeed) + st->minlifespeed;
}
newcell (st, &st->arr[y * st->arr_width + x], c, s);
}
}
static void update (struct state *st)
{
cell *a;
for (a = st->head->next; a != st->tail; a = a->next)
{
static const XPoint all_coords[] = {{-1, -1}, {-1, 1}, {1, -1}, {1, 1},
{-1, 0}, { 1, 0}, {0, -1}, {0, 1},
{99, 99}};
const XPoint *coords = 0;
if (a->speed == 0) continue;
a->growth += a->speed;
if (a->growth >= st->diaglim)
{
coords = all_coords;
}
else if (a->growth >= st->orthlim)
{
coords = &all_coords[4];
}
else
{
continue;
}
while (coords->x != 99)
{
int x = cell_x(a) + coords->x;
int y = cell_y(a) + coords->y;
coords++;
if (x < 0) x = st->arr_width - 1;
else if (x >= st->arr_width) x = 0;
if (y < 0) y = st->arr_height - 1;
else if (y >= st->arr_height) y = 0;
newcell (st, &st->arr[y * st->arr_width + x], a->col, a->speed);
}
if (a->growth >= st->diaglim)
killcell (st, a);
}
randblip (st, (st->head->next) == st->tail);
for (a = st->head->next; a != st->tail; a = a->next)
{
if (a->isnext)
{
a->isnext = 0;
a->speed = a->nextspeed;
a->growth = 0.0;
a->col = a->nextcol;
drawblock (st, cell_x(a), cell_y(a), a->col + st->count);
}
}
}
static void *
petri_init (Display *dpy, Window win)
{
struct state *st = (struct state *) calloc (1, sizeof(*st));
st->dpy = dpy;
st->window = win;
st->delay = get_integer_resource (st->dpy, "delay", "Delay");
st->orthlim = 1;
setup_display (st);
setup_arr (st);
randblip (st, 1);
return st;
}
static unsigned long
petri_draw (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
update (st);
return st->delay;
}
static void
petri_reshape (Display *dpy, Window window, void *closure,
unsigned int w, unsigned int h)
{
}
static Bool
petri_event (Display *dpy, Window window, void *closure, XEvent *event)
{
return False;
}
static void
petri_free (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
if (st->arr) free (st->arr);
if (st->head) free (st->head);
if (st->tail) free (st->tail);
if (st->coloredGCs) {
int i;
for (i = 0; i < st->count*2; i++)
XFreeGC (st->dpy, st->coloredGCs[i]);
free (st->coloredGCs);
}
free (st);
}
static const char *petri_defaults [] = {
".background: black",
".foreground: white",
"*fpsSolid: true",
"*delay: 10000",
"*count: 20",
"*size: 2",
"*diaglim: 1.414",
"*anychan: 0.0015",
"*minorchan: 0.5",
"*instantdeathchan: 0.2",
"*minlifespan: 500",
"*maxlifespan: 1500",
"*minlifespeed: 0.04",
"*maxlifespeed: 0.13",
"*mindeathspeed: 0.42",
"*maxdeathspeed: 0.46",
"*originalcolors: false",
"*memThrottle: 22M", /* don't malloc more than this much.
Scale the pixels up if necessary. */
#ifdef HAVE_MOBILE
"*ignoreRotation: True",
#endif
0
};
static XrmOptionDescRec petri_options [] = {
{ "-delay", ".delay", XrmoptionSepArg, 0 },
{ "-size", ".size", XrmoptionSepArg, 0 },
{ "-count", ".count", XrmoptionSepArg, 0 },
{ "-diaglim", ".diaglim", XrmoptionSepArg, 0 },
{ "-anychan", ".anychan", XrmoptionSepArg, 0 },
{ "-minorchan", ".minorchan", XrmoptionSepArg, 0 },
{ "-instantdeathchan", ".instantdeathchan", XrmoptionSepArg, 0 },
{ "-minlifespan", ".minlifespan", XrmoptionSepArg, 0 },
{ "-maxlifespan", ".maxlifespan", XrmoptionSepArg, 0 },
{ "-minlifespeed", ".minlifespeed", XrmoptionSepArg, 0 },
{ "-maxlifespeed", ".maxlifespeed", XrmoptionSepArg, 0 },
{ "-mindeathspeed", ".mindeathspeed", XrmoptionSepArg, 0 },
{ "-maxdeathspeed", ".maxdeathspeed", XrmoptionSepArg, 0 },
{ "-originalcolors", ".originalcolors", XrmoptionNoArg, "true" },
{ "-mem-throttle", ".memThrottle", XrmoptionSepArg, 0 },
{ 0, 0, 0, 0 }
};
XSCREENSAVER_MODULE ("Petri", petri)
