/*
* Substrate (dragorn@kismetwireless.net)
* Directly ported code from complexification.net Substrate art
* http://complexification.net/gallery/machines/substrate/applet_s/substrate_s.pde
*
* Substrate code:
* j.tarbell June, 2004
* Albuquerque, New Mexico
* complexification.net
*
* CHANGES
*
* 1.1 dragorn Jan 04 2005 Fixed some indenting, typo in errors for parsing
* cmdline args
* 1.1 dagraz Jan 04 2005 Added option for circular cracks (David Agraz)
* Cleaned up issues with timeouts in start_crack (DA)
* 1.0 dragorn Oct 10 2004 First port done
*
* Directly based the hacks of:
*
* xscreensaver, Copyright (c) 1997, 1998, 2002 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
* 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.
*/
#include <math.h>
#include "screenhack.h"
/* this program goes faster if some functions are inline. The following is
* borrowed from ifs.c */
#if !defined( __GNUC__ ) && !defined(__cplusplus) && !defined(c_plusplus)
#undef inline
#define inline /* */
#endif
#define STEP 0.42
/* Raw colormap extracted from pollockEFF.gif */
static const char *rgb_colormap[] = {
"#201F21", "#262C2E", "#352626", "#372B27",
"#302C2E", "#392B2D", "#323229", "#3F3229",
"#38322E", "#2E333D", "#333A3D", "#473329",
"#40392C", "#40392E", "#47402C", "#47402E",
"#4E402C", "#4F402E", "#4E4738", "#584037",
"#65472D", "#6D5D3D", "#745530", "#755532",
"#745D32", "#746433", "#7C6C36", "#523152",
"#444842", "#4C5647", "#655D45", "#6D5D44",
"#6C5D4E", "#746C43", "#7C6C42", "#7C6C4B",
"#6B734B", "#73734B", "#7B7B4A", "#6B6C55",
"#696D5E", "#7B6C5D", "#6B7353", "#6A745D",
"#727B52", "#7B7B52", "#57746E", "#687466",
"#9C542B", "#9D5432", "#9D5B35", "#936B36",
"#AA7330", "#C45A27", "#D95223", "#D85A20",
"#DB5A23", "#E57037", "#836C4B", "#8C6B4B",
"#82735C", "#937352", "#817B63", "#817B6D",
"#927B63", "#D9893B", "#E49832", "#DFA133",
"#E5A037", "#F0AB3B", "#8A8A59", "#B29A58",
"#89826B", "#9A8262", "#888B7C", "#909A7A",
"#A28262", "#A18A69", "#A99968", "#99A160",
"#99A168", "#CA8148", "#EB8D43", "#C29160",
"#C29168", "#D1A977", "#C9B97F", "#F0E27B",
"#9F928B", "#C0B999", "#E6B88F", "#C8C187",
"#E0C886", "#F2CC85", "#F5DA83", "#ECDE9D",
"#F5D294", "#F5DA94", "#F4E784", "#F4E18A",
"#F4E193", "#E7D8A7", "#F1D4A5", "#F1DCA5",
"#F4DBAD", "#F1DCAE", "#F4DBB5", "#F5DBBD",
"#F4E2AD", "#F5E9AD", "#F4E3BE", "#F5EABE",
"#F7F0B6", "#D9D1C1", "#E0D0C0", "#E7D8C0",
"#F1DDC6", "#E8E1C0", "#F3EDC7", "#F6ECCE",
"#F8F2C7", "#EFEFD0", 0
};
typedef struct {
/* Synthesis of data from Crack:: and SandPainter:: */
float x, y;
float t;
float ys, xs, t_inc; /* for curvature calculations */
int curved;
unsigned long sandcolor;
float sandp, sandg;
float degrees_drawn;
int crack_num;
} crack;
struct field {
unsigned int height;
unsigned int width;
unsigned int initial_cracks;
unsigned int num;
unsigned int max_num;
int grains; /* number of grains in the sand painting */
int circle_percent;
crack *cracks; /* grid of cracks */
int *cgrid; /* grid of actual crack placement */
/* Raw map of pixels we need to keep for alpha blending */
unsigned long int *off_img;
/* color parms */
int numcolors;
unsigned long *parsedcolors;
unsigned long fgcolor;
unsigned long bgcolor;
int visdepth;
unsigned int cycles;
unsigned int wireframe;
unsigned int seamless;
};
struct state {
Display *dpy;
Window window;
struct field *f;
unsigned int max_cycles;
int growth_delay;
GC fgc;
XWindowAttributes xgwa;
XGCValues gcv;
};
static void
*xrealloc(void *p, size_t size)
{
void *ret;
if ((ret = realloc(p, size)) == NULL) {
fprintf(stderr, "%s: out of memory\n", progname);
exit(1);
}
return ret;
}
static struct field
*init_field(void)
{
struct field *f = xrealloc(NULL, sizeof(struct field));
f->height = 0;
f->width = 0;
f->initial_cracks = 0;
f->num = 0;
f->max_num = 0;
f->cracks = NULL;
f->cgrid = NULL;
f->off_img = NULL;
f->numcolors = 0;
f->parsedcolors = NULL;
f->cycles = 0;
f->wireframe = 0;
f->seamless = 0;
f->fgcolor = 0;
f->bgcolor = 0;
f->visdepth = 0;
f->grains = 0;
f->circle_percent = 0;
return f;
}
/* Quick references to pixels in the offscreen map and in the crack grid */
#define ref_pixel(f, x, y) ((f)->off_img[(y) * (f)->width + (x)])
#define ref_cgrid(f, x, y) ((f)->cgrid[(y) * (f)->width + (x)])
static inline void start_crack(struct field *f, crack *cr)
{
/* synthesis of Crack::findStart() and crack::startCrack() */
int px = 0;
int py = 0;
int found = 0;
int timeout = 0;
float a;
/* shift until crack is found */
while ((!found) && (timeout++ < 10000)) {
px = (int) (random() % f->width);
py = (int) (random() % f->height);
if (ref_cgrid(f, px, py) < 10000)
found = 1;
}
if ( !found ) {
/* We timed out. Use our default values */
px = cr->x;
py = cr->y;
/* Sanity check needed */
if (px < 0) px = 0;
if (px >= f->width) px = f->width - 1;
if (py < 0) py = 0;
if (py >= f->height) py = f->height - 1;
ref_cgrid(f, px, py) = cr->t;
}
/* start a crack */
a = ref_cgrid(f, px, py);
if ((random() % 100) < 50) {
/* conversion of the java int(random(-2, 2.1)) */
a -= 90 + (frand(4.1) - 2.0);
} else {
a += 90 + (frand(4.1) - 2.0);
}
if ((random() % 100) < f->circle_percent) {
float r; /* radius */
float radian_inc;
cr->curved = 1;
cr->degrees_drawn = 0;
r = 10 + (random() % ((f->width + f->height) / 2));
if ((random() % 100) < 50) {
r *= -1;
}
/* arc length = r * theta => theta = arc length / r */
radian_inc = STEP / r;
cr->t_inc = radian_inc * 360 / 2 / M_PI;
cr->ys = r * sin(radian_inc);
cr->xs = r * ( 1 - cos(radian_inc));
}
else {
cr->curved = 0;
}
/* Condensed from Crack::startCrack */
cr->x = px + ((float) 0.61 * cos(a * M_PI / 180));
cr->y = py + ((float) 0.61 * sin(a * M_PI / 180));
cr->t = a;
}
static inline void make_crack(struct field *f)
{
crack *cr;
if (f->num < f->max_num) {
/* make a new crack */
f->cracks = (crack *) xrealloc(f->cracks, sizeof(crack) * (f->num + 1));
cr = &(f->cracks[f->num]);
/* assign colors */
cr->sandp = 0;
cr->sandg = (frand(0.2) - 0.01);
cr->sandcolor = f->parsedcolors[random() % f->numcolors];
cr->crack_num = f->num;
cr->curved = 0;
cr->degrees_drawn = 0;
/* We could use these values in the timeout case of start_crack */
cr->x = random() % f->width;
cr->y = random() % f->height;
cr->t = random() % 360;
/* start it */
start_crack(f, cr);
f->num++;
}
}
static inline void point2rgb(int depth, unsigned long c, int *r, int *g, int *b)
{
switch(depth) {
case 32:
case 24:
#ifdef HAVE_JWXYZ
/* This program idiotically does not go through a color map, so
we have to hardcode in knowledge of how jwxyz.a packs pixels!
Fix it to go through st->colors[st->ncolors] instead!
*/
*r = (c & 0x00ff0000) >> 16;
*g = (c & 0x0000ffff) >> 8;
*b = (c & 0x000000ff);
#else
*g = (c & 0xff00) >> 8;
*r = (c & 0xff0000) >> 16;
*b = c & 0xff;
#endif
break;
case 16:
*g = ((c >> 5) & 0x3f) << 2;
*r = ((c >> 11) & 0x1f) << 3;
*b = (c & 0x1f) << 3;
break;
case 15:
*g = ((c >> 5) & 0x1f) << 3;
*r = ((c >> 10) & 0x1f) << 3;
*b = (c & 0x1f) << 3;
break;
}
}
static inline unsigned long rgb2point(int depth, int r, int g, int b)
{
unsigned long ret = 0;
switch(depth) {
case 32:
case 24:
#ifdef HAVE_JWXYZ
/* This program idiotically does not go through a color map, so
we have to hardcode in knowledge of how jwxyz.a packs pixels!
Fix it to go through st->colors[st->ncolors] instead!
*/
ret = 0xFF000000 | (r << 16) | (g << 8) | b;
#else
ret |= (r << 16) | (g << 8) | b;
#endif
break;
case 16:
ret = ((r>>3) << 11) | ((g>>2)<<5) | (b>>3);
break;
case 15:
ret = ((r>>3) << 10) | ((g>>3)<<5) | (b>>3);
break;
}
return ret;
}
/* alpha blended point drawing -- this is Not Right and will likely fail on
* non-intel platforms as it is now, needs fixing */
static inline unsigned long
trans_point(struct state *st,
int x1, int y1, unsigned long myc, float a,
struct field *f)
{
if ((x1 >= 0) && (x1 < f->width) && (y1 >= 0) && (y1 < f->height)) {
if (a >= 1.0) {
ref_pixel(f, x1, y1) = myc;
} else {
int or = 0, og = 0, ob = 0;
int r = 0, g = 0, b = 0;
int nr, ng, nb;
unsigned long c;
c = ref_pixel(f, x1, y1);
point2rgb(f->visdepth, c, &or, &og, &ob);
point2rgb(f->visdepth, myc, &r, &g, &b);
nr = or + (r - or) * a;
ng = og + (g - og) * a;
nb = ob + (b - ob) * a;
c = rgb2point(f->visdepth, nr, ng, nb);
ref_pixel(f, x1, y1) = c;
return c;
}
}
return f->bgcolor;
}
static inline void
region_color(struct state *st, GC fgc, struct field *f, crack *cr)
{
/* synthesis of Crack::regionColor() and SandPainter::render() */
float rx = cr->x;
float ry = cr->y;
int openspace = 1;
int cx, cy;
float maxg;
int grains, i;
float w;
float drawx, drawy;
unsigned long c;
while (openspace) {
/* move perpendicular to crack */
rx += (0.81 * sin(cr->t * M_PI/180));
ry -= (0.81 * cos(cr->t * M_PI/180));
cx = (int) rx;
cy = (int) ry;
if (f->seamless) {
cx %= f->width;
cy %= f->height;
}
if ((cx >= 0) && (cx < f->width) && (cy >= 0) && (cy < f->height)) {
/* safe to check */
if (f->cgrid[cy * f->width + cx] > 10000) {
/* space is open */
} else {
openspace = 0;
}
} else {
openspace = 0;
}
}
/* SandPainter stuff here */
/* Modulate gain */
cr->sandg += (frand(0.1) - 0.050);
maxg = 1.0;
if (cr->sandg < 0)
cr->sandg = 0;
if (cr->sandg > maxg)
cr->sandg = maxg;
grains = f->grains;
/* Lay down grains of sand */
w = cr->sandg / (grains - 1);
for (i = 0; i < grains; i++) {
drawx = (cr->x + (rx - cr->x) * sin(cr->sandp + sin((float) i * w)));
drawy = (cr->y + (ry - cr->y) * sin(cr->sandp + sin((float) i * w)));
if (f->seamless) {
drawx = fmod(drawx + f->width, f->width);
drawy = fmod(drawy + f->height, f->height);
}
/* Draw sand bit */
c = trans_point(st, drawx, drawy, cr->sandcolor, (0.1 - i / (grains * 10.0)), f);
XSetForeground(st->dpy, fgc, c);
XDrawPoint(st->dpy, st->window, fgc, (int) drawx, (int) drawy);
XSetForeground(st->dpy, fgc, f->fgcolor);
}
}
static void build_substrate(struct field *f)
{
int tx;
/* int ty; */
f->cycles = 0;
if (f->cgrid) {
free(f->cgrid);
f->cgrid = NULL;
}
if (f->cracks) {
free(f->cracks);
f->cracks = NULL;
}
f->num = 0;
/* erase the crack grid */
f->cgrid = (int *) xrealloc(f->cgrid, sizeof(int) * f->height * f->width);
{
int j;
int *p = f->cgrid;
for (j = 0; j < f->height * f->width; j++)
*p++ = 10001;
}
/* Not necessary now that make_crack ensures we have usable default
* values in start_crack's timeout case
* make random crack seeds *
for (tx = 0; tx < 16; tx++) {
ty = (int) (random() % (f->width * f->height - 1));
f->cgrid[ty] = (int) random() % 360;
}
*/
/* make the initial cracks */
for (tx = 0; tx < f->initial_cracks; tx++)
make_crack(f);
}
static inline void
movedrawcrack(struct state *st, GC fgc, struct field *f, int cracknum)
{
/* Basically Crack::move() */
int cx, cy;
crack *cr = &(f->cracks[cracknum]);
/* continue cracking */
if ( !cr->curved ) {
cr->x += ((float) STEP * cos(cr->t * M_PI/180));
cr->y += ((float) STEP * sin(cr->t * M_PI/180));
}
else {
cr->x += ((float) cr->ys * cos(cr->t * M_PI/180));
cr->y += ((float) cr->ys * sin(cr->t * M_PI/180));
cr->x += ((float) cr->xs * cos(cr->t * M_PI/180 - M_PI / 2));
cr->y += ((float) cr->xs * sin(cr->t * M_PI/180 - M_PI / 2));
cr->t += cr->t_inc;
cr->degrees_drawn += fabsf(cr->t_inc);
}
if (f->seamless) {
cr->x = fmod(cr->x + f->width, f->width);
cr->y = fmod(cr->y + f->height, f->height);
}
/* bounds check */
/* modification of random(-0.33,0.33) */
cx = (int) (cr->x + (frand(0.66) - 0.33));
cy = (int) (cr->y + (frand(0.66) - 0.33));
if (f->seamless) {
cx %= f->width;
cy %= f->height;
}
if ((cx >= 0) && (cx < f->width) && (cy >= 0) && (cy < f->height)) {
/* draw sand painter if we're not wireframe */
if (!f->wireframe)
region_color(st, fgc, f, cr);
/* draw fgcolor crack */
ref_pixel(f, cx, cy) = f->fgcolor;
XDrawPoint(st->dpy, st->window, fgc, cx, cy);
if ( cr->curved && (cr->degrees_drawn > 360) ) {
/* completed the circle, stop cracking */
start_crack(f, cr); /* restart ourselves */
make_crack(f); /* generate a new crack */
}
/* safe to check */
else if ((f->cgrid[cy * f->width + cx] > 10000) ||
(fabsf(f->cgrid[cy * f->width + cx] - cr->t) < 5)) {
/* continue cracking */
f->cgrid[cy * f->width + cx] = (int) cr->t;
} else if (fabsf(f->cgrid[cy * f->width + cx] - cr->t) > 2) {
/* crack encountered (not self), stop cracking */
start_crack(f, cr); /* restart ourselves */
make_crack(f); /* generate a new crack */
}
} else {
/* out of bounds, stop cracking */
/* need these in case of timeout in start_crack */
cr->x = random() % f->width;
cr->y = random() % f->height;
cr->t = random() % 360;
start_crack(f, cr); /* restart ourselves */
make_crack(f); /* generate a new crack */
}
}
static void build_img(Display *dpy, Window window, XWindowAttributes xgwa, GC fgc,
struct field *f)
{
if (f->off_img) {
free(f->off_img);
f->off_img = NULL;
}
f->off_img = (unsigned long *) xrealloc(f->off_img, sizeof(unsigned long) *
f->width * f->height);
memset(f->off_img, f->bgcolor, sizeof(unsigned long) * f->width * f->height);
}
static void *
substrate_init (Display *dpy, Window window)
{
struct state *st = (struct state *) calloc (1, sizeof(*st));
XColor tmpcolor;
st->dpy = dpy;
st->window = window;
st->f = init_field();
st->growth_delay = (get_integer_resource(st->dpy, "growthDelay", "Integer"));
st->max_cycles = (get_integer_resource(st->dpy, "maxCycles", "Integer"));
st->f->initial_cracks = (get_integer_resource(st->dpy, "initialCracks", "Integer"));
st->f->max_num = (get_integer_resource(st->dpy, "maxCracks", "Integer"));
st->f->wireframe = (get_boolean_resource(st->dpy, "wireFrame", "Boolean"));
st->f->grains = (get_integer_resource(st->dpy, "sandGrains", "Integer"));
st->f->circle_percent = (get_integer_resource(st->dpy, "circlePercent", "Integer"));
st->f->seamless = (get_boolean_resource(st->dpy, "seamless", "Boolean"));
if (st->f->initial_cracks <= 2) {
fprintf(stderr, "%s: Initial cracks must be greater than 2\n", progname);
exit (1);
}
if (st->f->max_num <= 10) {
fprintf(stderr, "%s: Maximum number of cracks must be less than 10\n",
progname);
exit (1);
}
if (st->f->circle_percent < 0) {
fprintf(stderr, "%s: circle percent must be at least 0\n", progname);
exit (1);
}
if (st->f->circle_percent > 100) {
fprintf(stderr, "%s: circle percent must be less than 100\n", progname);
exit (1);
}
XGetWindowAttributes(st->dpy, st->window, &st->xgwa);
st->f->height = st->xgwa.height;
st->f->width = st->xgwa.width;
st->f->visdepth = st->xgwa.depth;
/* Count the colors in our map and assign them in a horrifically inefficient
* manner but it only happens once */
while (rgb_colormap[st->f->numcolors] != NULL) {
st->f->parsedcolors = (unsigned long *) xrealloc(st->f->parsedcolors,
sizeof(unsigned long) *
(st->f->numcolors + 1));
if (!XParseColor(st->dpy, st->xgwa.colormap, rgb_colormap[st->f->numcolors], &tmpcolor)) {
fprintf(stderr, "%s: couldn't parse color %s\n", progname,
rgb_colormap[st->f->numcolors]);
exit(1);
}
if (!XAllocColor(st->dpy, st->xgwa.colormap, &tmpcolor)) {
fprintf(stderr, "%s: couldn't allocate color %s\n", progname,
rgb_colormap[st->f->numcolors]);
exit(1);
}
st->f->parsedcolors[st->f->numcolors] = tmpcolor.pixel;
st->f->numcolors++;
}
st->gcv.foreground = get_pixel_resource(st->dpy, st->xgwa.colormap,
"foreground", "Foreground");
st->gcv.background = get_pixel_resource(st->dpy, st->xgwa.colormap,
"background", "Background");
st->fgc = XCreateGC(st->dpy, st->window, GCForeground, &st->gcv);
st->f->fgcolor = st->gcv.foreground;
st->f->bgcolor = st->gcv.background;
/* Initialize stuff */
build_img(st->dpy, st->window, st->xgwa, st->fgc, st->f);
build_substrate(st->f);
return st;
}
static unsigned long
substrate_draw (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
int tempx;
if ((st->f->cycles % 10) == 0) {
/* Restart if the window size changes */
XGetWindowAttributes(st->dpy, st->window, &st->xgwa);
if (st->f->height != st->xgwa.height || st->f->width != st->xgwa.width) {
st->f->height = st->xgwa.height;
st->f->width = st->xgwa.width;
st->f->visdepth = st->xgwa.depth;
build_substrate(st->f);
build_img(st->dpy, st->window, st->xgwa, st->fgc, st->f);
XSetForeground(st->dpy, st->fgc, st->gcv.background);
XFillRectangle(st->dpy, st->window, st->fgc, 0, 0, st->xgwa.width, st->xgwa.height);
XSetForeground(st->dpy, st->fgc, st->gcv.foreground);
}
}
for (tempx = 0; tempx < st->f->num; tempx++) {
movedrawcrack(st, st->fgc, st->f, tempx);
}
st->f->cycles++;
if (st->f->cycles >= st->max_cycles && st->max_cycles != 0) {
build_substrate(st->f);
build_img(st->dpy, st->window, st->xgwa, st->fgc, st->f);
XSetForeground(st->dpy, st->fgc, st->gcv.background);
XFillRectangle(st->dpy, st->window, st->fgc, 0, 0, st->xgwa.width, st->xgwa.height);
XSetForeground(st->dpy, st->fgc, st->gcv.foreground);
}
/* #### mi->recursion_depth = st->f->cycles; */
return st->growth_delay;
}
static void
substrate_reshape (Display *dpy, Window window, void *closure,
unsigned int w, unsigned int h)
{
}
static Bool
substrate_event (Display *dpy, Window window, void *closure, XEvent *event)
{
struct state *st = (struct state *) closure;
if (screenhack_event_helper (dpy, window, event))
{
st->f->cycles = st->max_cycles;
return True;
}
return False;
}
static void
substrate_free (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
free (st);
}
static const char *substrate_defaults[] = {
".background: white",
".foreground: black",
"*fpsSolid: true",
"*wireFrame: false",
"*seamless: false",
"*maxCycles: 10000",
"*growthDelay: 18000",
"*initialCracks: 3",
"*maxCracks: 100",
"*sandGrains: 64",
"*circlePercent: 33",
#ifdef HAVE_MOBILE
"*ignoreRotation: True",
#endif
0
};
static XrmOptionDescRec substrate_options[] = {
{"-background", ".background", XrmoptionSepArg, 0},
{"-foreground", ".foreground", XrmoptionSepArg, 0},
{"-wireframe", ".wireFrame", XrmoptionNoArg, "true"},
{"-seamless", ".seamless", XrmoptionNoArg, "true"},
{"-max-cycles", ".maxCycles", XrmoptionSepArg, 0},
{"-growth-delay", ".growthDelay", XrmoptionSepArg, 0},
{"-initial-cracks", ".initialCracks", XrmoptionSepArg, 0},
{"-max-cracks", ".maxCracks", XrmoptionSepArg, 0},
{"-sand-grains", ".sandGrains", XrmoptionSepArg, 0},
{"-circle-percent", ".circlePercent", XrmoptionSepArg, 0},
{0, 0, 0, 0}
};
XSCREENSAVER_MODULE ("Substrate", substrate)