/*
* Binary Ring
* Copyright (c) 2006-2014 Emilio Del Tessandoro <emilio.deltessa@gmail.com>
*
* Directly ported code from complexification.net Binary Ring art
* http://www.complexification.net/gallery/machines/binaryRing/appletm/BinaryRing_m.pde
*
* Binary Ring code:
* j.tarbell June, 2004
* Albuquerque, New Mexico
* complexification.net
*
* 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 "screenhack.h"
#include "colors.h"
#include "hsv.h"
#define ANTIALIAS 1
#define BLACK 0
#define WHITE 1
#define swap(a, b) do { __typeof__(a) tmp; tmp = a; a = b; b = tmp; } while(0)
#define frand1() ((((int) random() ) << 1) * 4.65661287524579692411E-10)
#define min(a,b) ((a)<(b)?(a):(b))
#define max(a,b) ((a)>(b)?(a):(b))
/* better if signed */
typedef unsigned long pixel_t;
typedef struct {
float x, y;
float xx, yy;
float vx, vy;
float color;
int age; /* age from 0 to ageMax */
} particle_t;
struct state {
int epoch;
int growth_delay;
int ring_radius;
int max_age;
float curliness;
int particles_number;
particle_t* particles;
Display *display; /* variables for the X stuff */
Window window;
GC gc;
XGCValues gcv;
Visual* visual;
int depth;
int width;
int height;
Pixmap pix; /* for reshape */
XImage* buf; /* buffer */
pixel_t* buffer;
pixel_t colors[2];
Bool color;
};
static void point2rgb(int depth, pixel_t 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 pixel_t rgb2point(int depth, int r, int g, int b)
{
pixel_t 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;
}
void print_color ( struct state* st, pixel_t color );
/* alpha blended point drawing -- this is Not Right and will likely fail on
* non-intel platforms as it is now, needs fixing
*/
static
void draw_point ( struct state* st,
int x, int y, pixel_t myc, float a ) {
int or = 0, og = 0, ob = 0;
int r = 0, g = 0, b = 0;
int nr, ng, nb;
register pixel_t c;
/*or = st->buffer[ 3 * ( y * st->width + x ) + 0 ];
og = st->buffer[ 3 * ( y * st->width + x ) + 1 ];
ob = st->buffer[ 3 * ( y * st->width + x ) + 2 ];*/
c = st->buffer[ y * st->width + x ];
point2rgb( st->depth, c, &or, &og, &ob );
point2rgb( st->depth, myc, &r, &g, &b );
nr = or + (r - or) * a;
ng = og + (g - og) * a;
nb = ob + (b - ob) * a;
/*st->buffer[ 3 * ( y * st->width + x ) + 0 ] = nr;
st->buffer[ 3 * ( y * st->width + x ) + 1 ] = ng;
st->buffer[ 3 * ( y * st->width + x ) + 2 ] = nb;*/
c = rgb2point(st->depth, nr, ng, nb);
st->buffer[ y * st->width + x ] = c;
XPutPixel( st->buf, x, y, c );
}
void print_color ( struct state* st, pixel_t color ) {
int r=0, g=0, b=0;
point2rgb(st->depth, color, &r, &g, &b);
printf( "%d %d %d\n", r, g, b);
}
#if ANTIALIAS
#define plot_(X,Y,D) do{ \
_dla_plot(st, (X), (Y), color, (D) * alpha); }while(0)
static
void _dla_plot(struct state* st, int x, int y, pixel_t col, float br)
{
if ( ( x >= 0 && x < st->width ) && ( y >= 0 && y < st->height ) ) {
if ( br > 1.0f ) br = 1.0f;
draw_point( st, x, y, col, br );
}
}
#define ipart_(X) ((int)(X))
#define round_(X) ((int)(((float)(X))+0.5))
#define fpart_(X) (((float)(X))-(float)ipart_(X))
#define rfpart_(X) (1.0-fpart_(X))
static
void draw_line_antialias(
struct state* st,
int x1, int y1,
int x2, int y2,
pixel_t color, float alpha )
{
float dx = (float)x2 - (float)x1;
float dy = (float)y2 - (float)y1;
float gradient;
float xend;
float yend;
float xgap;
float ygap;
int xpxl1;
int ypxl1;
float intery;
float interx;
int xpxl2;
int ypxl2;
int x;
int y;
/* hard clipping, because this routine has some problems with negative coordinates */
/* TODO: fix the alpha for that boundary cases. Using fabs() could solve? */
if ( ( x1 < 0 || x1 > st->width ) ||
( x2 < 0 || x2 > st->width ) ||
( y1 < 0 || y1 > st->height ) ||
( y2 < 0 || y2 > st->height ) )
return;
if ( fabs(dx) > fabs(dy) ) {
if ( x2 < x1 ) {
swap(x1, x2);
swap(y1, y2);
}
gradient = dy / dx;
xend = round_(x1);
yend = y1 + gradient*(xend - x1);
xgap = rfpart_(x1 + 0.5);
xpxl1 = xend;
ypxl1 = ipart_(yend);
plot_(xpxl1, ypxl1, rfpart_(yend)*xgap);
plot_(xpxl1, ypxl1+1, fpart_(yend)*xgap);
intery = yend + gradient;
xend = round_(x2);
yend = y2 + gradient*(xend - x2);
xgap = fpart_(x2+0.5);
xpxl2 = xend;
ypxl2 = ipart_(yend);
plot_(xpxl2, ypxl2, rfpart_(yend) * xgap);
plot_(xpxl2, ypxl2 + 1, fpart_(yend) * xgap);
/*if ( rfpart_(yend) * xgap < 0 || fpart_(yend) * xgap < 0)
printf("%f %f\n", rfpart_(yend) * xgap, fpart_(yend) * xgap);*/
for(x=xpxl1+1; x <= (xpxl2-1); x++) {
plot_(x, ipart_(intery), rfpart_(intery));
plot_(x, ipart_(intery) + 1, fpart_(intery));
/*if ( rfpart_(intery) < 0 || fpart_(intery) < 0)
printf("%f %f\n", rfpart_(intery), fpart_(intery));*/
intery += gradient;
}
} else {
if ( y2 < y1 ) {
swap(x1, x2);
swap(y1, y2);
}
gradient = dx / dy;
yend = round_(y1);
xend = x1 + gradient*(yend - y1);
ygap = rfpart_(y1 + 0.5);
ypxl1 = yend;
xpxl1 = ipart_(xend);
plot_(xpxl1, ypxl1, rfpart_(xend)*ygap);
plot_(xpxl1, ypxl1+1, fpart_(xend)*ygap);
interx = xend + gradient;
yend = round_(y2);
xend = x2 + gradient*(yend - y2);
ygap = fpart_(y2+0.5);
ypxl2 = yend;
xpxl2 = ipart_(xend);
plot_(xpxl2, ypxl2, rfpart_(xend) * ygap);
plot_(xpxl2, ypxl2 + 1, fpart_(xend) * ygap);
for(y=ypxl1+1; y <= (ypxl2-1); y++) {
plot_(ipart_(interx), y, rfpart_(interx));
plot_(ipart_(interx) + 1, y, fpart_(interx));
interx += gradient;
}
}
}
#undef plot_
#undef ipart_
#undef fpart_
#undef round_
#undef rfpart_
#else
static
void draw_line ( struct state* st, int x0, int y0, int x1, int y1, int color, float a ) {
register int steep;
register int deltax;
register int deltay;
register int error;
register int ystep;
register int y;
register int x;
steep = abs ( y1 - y0 ) > abs ( x1 - x0 );
if ( steep ) { swap(x0,y0); swap(x1,y1); }
if ( x0 > x1 ) { swap(x0,x1); swap(y0,y1); }
deltax = x1 - x0;
deltay = abs(y1-y0);
error = 0;
y = y0;
ystep = y0 < y1 ? 1 : -1;
if ( a > 1.0f ) a = 1.0f;
for ( x = x0; x < x1; x++ ) {
if ( steep ) {
if ( ( y >= 0 && y < st->width ) && ( x >= 0 && x < st->height ) )
draw_point( st, y, x, color, a );
} else {
if ( ( x >= 0 && x < st->width ) && ( y >= 0 && y < st->height ) )
draw_point( st, x, y, color, a );
}
error += deltay;
if ( ( error << 1 ) > deltax ) {
y += ystep;
error -= deltax;
}
}
}
#endif
static void create_buffers ( struct state* st, Display* display, Screen* screen, Window window, GC gc ) {
XWindowAttributes xgwa;
XGetWindowAttributes( display, window, &xgwa );
/* Initialize the pixmap */
if ( st->buf != NULL ) XFreePixmap( display, st->pix );
XSetForeground( display, gc, st->colors[BLACK] );
st->pix = XCreatePixmap( display, window, st->width, st->height,
xgwa.depth );
XFillRectangle( display, st->pix, gc, 0, 0, st->width, st->height);
/* Initialize the bitmap */
if ( st->buf != NULL ) XDestroyImage ( st->buf );
st->buf = XGetImage( display, st->pix, 0, 0, st->width, st->height, visual_depth(screen, st->visual), ZPixmap );
st->buffer = (pixel_t*) calloc(sizeof(pixel_t), st->width * st->height);
/*int i;
for ( i = 0; i < st->width * st->height; ++i ) st->buffer[i] = st->colors[BLACK];*/
}
static void init_particle ( particle_t* p, float dx, float dy, float direction, int color, int max_age ) {
float max_initial_velocity = 2.0f;
p->x = -dx;
p->y = -dy;
p->xx = 0;
p->yy = 0;
p->vx = max_initial_velocity * cos(direction);
p->vy = max_initial_velocity * sin(direction);
p->age = random() % max_age;
p->color = color;
}
static void clamp ( int* value, int l, int h ) {
if ( *value < l ) *value = l;
if ( *value > h ) *value = h;
}
static pixel_t next_color ( struct state* st, pixel_t current ) {
int r=0, g=0, b=0;
point2rgb(st->depth, current, &r, &g, &b);
r += random() % 5 - 2;
g += random() % 5 - 2;
b += random() % 5 - 2;
clamp(&r, 0, 255);
clamp(&g, 0, 255);
clamp(&b, 0, 255);
return rgb2point( st->depth, r, g, b );
}
static void create_particles ( struct state* st ) {
int i;
float emitx, emity;
float direction;
for ( i = 0; i < st->particles_number; i++ ) {
emitx = ( st->ring_radius * sinf( M_PI * 2 * ( (float) i / st->particles_number ) ) );
emity = ( st->ring_radius * cosf( M_PI * 2 * ( (float) i / st->particles_number ) ) );
direction = (M_PI * i) / st->particles_number;
if ( st->epoch == WHITE && st->color )
st->colors[WHITE] = next_color(st, st->colors[WHITE]);
init_particle(st->particles + i, emitx, emity, direction, st->colors[WHITE], st->max_age);
}
}
/* randomly move one particle and draw it */
static void move ( particle_t* p, struct state * st ) {
int w = st->width / 2;
int h = st->height / 2;
float max_dv = 1.0f;
p->xx = p->x;
p->yy = p->y;
p->x += p->vx;
p->y += p->vy;
p->vx += frand1() * st->curliness * max_dv;
p->vy += frand1() * st->curliness * max_dv;
#if ANTIALIAS
draw_line_antialias( st,
w+p->xx, h+p->yy, w+p->x, h+p->y, p->color, 0.15 );
draw_line_antialias( st,
w-p->xx, h+p->yy, w-p->x, h+p->y, p->color, 0.15 );
#else
draw_line( st, w+p->xx, h+p->yy, w+p->x, h+p->y, p->color, 0.15 );
draw_line( st, w-p->xx, h+p->yy, w-p->x, h+p->y, p->color, 0.15 );
#endif
p->age++;
/* if this is too old, die and reborn */
if ( p->age > st->max_age ) {
float dir = frand1() * 2 * M_PI;
p->x = st->ring_radius * sin(dir);
p->y = st->ring_radius * cos(dir);
p->xx = p->yy = p->vx = p->vy = 0;
p->age = 0;
if ( st->epoch == WHITE && st->color )
st->colors[WHITE] = next_color(st, st->colors[WHITE] );
p->color = st->colors[st->epoch];
}
}
/* Initialize Everything */
static void* binaryring_init ( Display* display, Window window ) {
XWindowAttributes xgwa;
struct state *st = ( struct state* ) calloc ( 1, sizeof( *st ) );
XGetWindowAttributes( display, window, &xgwa );
st->epoch = WHITE;
st->display = display;
st->window = window;
st->particles_number = (get_integer_resource(st->display, "particles_number", "Integer"));
st->growth_delay = (get_integer_resource(st->display, "growth_delay", "Integer"));
st->ring_radius = (get_integer_resource(st->display, "ring_radius", "Integer"));
st->max_age = (get_integer_resource(st->display, "max_age", "Integer"));
st->color = get_boolean_resource(st->display, "color", "Boolean");
st->height = xgwa.height;
st->width = xgwa.width;
st->visual = xgwa.visual;
st->curliness = 0.5;
st->depth = visual_depth(xgwa.screen, st->visual);
st->colors[0] = rgb2point(st->depth, 0, 0, 0);
st->colors[1] = rgb2point(st->depth, 255, 255, 255);
/*describe_visual (stdout, xgwa.screen, xgwa.visual, False);*/
st->particles = malloc (st->particles_number * sizeof( particle_t ) );
create_particles ( st );
st->gc = XCreateGC( st->display, st->window, 0, &st->gcv );
create_buffers ( st, display, xgwa.screen, window, st->gc );
return st;
}
static unsigned long binaryring_draw ( Display* display, Window win, void *closure ) {
struct state *st = (struct state *) closure;
int i;
for ( i = 0; i < st->particles_number; i++ )
move( &(st->particles[i]), st );
/* draw the XImage in the Pixmap and the put the Pixmap on the screen */
XPutImage( display, st->pix, st->gc, st->buf, 0, 0, 0, 0, st->width, st->height);
XCopyArea( display, st->pix, win, st->gc, 0, 0, st->width, st->height, 0, 0 );
/* randomly switch ageColor periods */
if ( random() % 10000 > 9950 )
st->epoch = (st->epoch == WHITE) ? BLACK : WHITE;
return st->growth_delay;
}
static void binaryring_reshape ( Display* display, Window win, void *closure, unsigned int w, unsigned int h ) {
struct state *st = (struct state *) closure;
XWindowAttributes tmp;
XGetWindowAttributes(display, win, &tmp);
if ( tmp.height != st->height || tmp.width != st->width ) {
st->height = tmp.height;
st->width = tmp.width;
st->epoch = WHITE;
create_particles ( st );
create_buffers ( st, display, tmp.screen, win, st->gc );
}
}
/* if someone press a key switch the color */
static Bool binaryring_event ( Display* display, Window win, void *closure, XEvent* event ) {
struct state *st = (struct state *) closure;
if ( (*event).xany.type == KeyPress ) {
st->epoch = (st->epoch == WHITE) ? BLACK : WHITE;
}
return False;
}
/* delete everything */
static void binaryring_free ( Display* display, Window win, void *closure ) {
struct state *st = (struct state *) closure;
XWindowAttributes tmp;
XGetWindowAttributes(display, win, &tmp);
free( st->buffer );
free( st->particles );
free ( st );
}
/* Default resources of the program */
static const char* binaryring_defaults [] = {
".background: black",
".foreground: white",
"*growth_delay: 10000",
"*particles_number: 5000",
"*ring_radius: 40",
"*max_age: 400",
"*color: True",
"*ignoreRotation: True",
0
};
static XrmOptionDescRec binaryring_options [] = {
{ "-particles-number", ".particles_number", XrmoptionSepArg, 0 },
{ "-growth-delay", ".growth_delay", XrmoptionSepArg, 0 },
{ "-ring-radius", ".ring_radius", XrmoptionSepArg, 0 },
{ "-max-age", ".max_age", XrmoptionSepArg, 0 },
{ "-color", ".color", XrmoptionNoArg, "True" },
{ "-no-color", ".color", XrmoptionNoArg, "False" },
{ 0, 0, 0, 0}
};
XSCREENSAVER_MODULE("BinaryRing", binaryring)