+++ /dev/null
-/* xscreensaver, Copyright (c) 1997 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"
-#include "spline.h"
-#include "alpha.h"
-
-
-/* This is pretty compute-intensive, probably due to the large number of
- polygon fills. I tried introducing a scaling factor to make the spline
- code emit fewer line segments, but that made the edges very rough.
- However, tuning *maxVelocity, *elasticity and *delay can result in much
- smoother looking animation. I tuned these for a 1280x1024 Indy display,
- but I don't know whether these values will be reasonable for a slower
- machine...
-
- The more planes the better -- SGIs have a 12-bit pseudocolor display
- (4096 colormap cells) which is mostly useless, except for this program,
- where it means you can have 11 or 12 mutually-transparent objects instead
- of only 7 or 8. But, if you are using the 12-bit visual, you should crank
- down the velocity and elasticity, or server slowness will cause the
- animation to look jerky (yes, it's sad but true, SGI's X server is
- perceptibly slower when using plane masks on a 12-bit visual than on an
- 8-bit visual.) Using -max-velocity 0.5 -elasticity 0.9 seems to work ok
- on my Indy R5k with visual 0x27 and the bottom-of-the-line 24-bit graphics
- board.
-
- It might look better if each blob had an outline, which was a *slightly*
- darker color than the center, to give them a bit more definition -- but
- that would mean using two planes per blob. (Or maybe allocating the
- outline colors outside of the plane-space? Then the outlines wouldn't be
- transparent, but maybe that wouldn't be so noticeable?)
-
- Oh, for an alpha channel... maybe I should rewrite this in GL. Then the
- blobs could have thickness, and curved edges with specular reflections...
- */
-
-
-#define SCALE 10000 /* fixed-point math, for sub-pixel motion */
-#define DEF_COUNT 12 /* When planes and count are 0, how many blobs. */
-
-
-#define RAND(n) ((long) ((random() & 0x7fffffff) % ((long) (n))))
-#define RANDSIGN() ((random() & 1) ? 1 : -1)
-
-struct blob {
- long x, y; /* position of midpoint */
- long dx, dy; /* velocity and direction */
- double torque; /* rotational speed */
- double th; /* angle of rotation */
- long elasticity; /* how fast they deform */
- long max_velocity; /* speed limit */
- long min_r, max_r; /* radius range */
- int npoints; /* control points */
- long *r; /* radii */
- spline *spline;
-};
-
-struct layer {
- int nblobs;
- struct blob **blobs;
- Pixmap pixmap;
- unsigned long pixel;
- GC gc;
-};
-
-enum goop_mode {
- transparent,
- opaque,
- xor,
- outline
-};
-
-struct goop {
- enum goop_mode mode;
- int width, height;
- int nlayers;
- struct layer **layers;
- unsigned long background;
- Pixmap pixmap;
- GC pixmap_gc;
- GC window_gc;
-};
-
-
-static struct blob *
-make_blob (int maxx, int maxy, int size)
-{
- struct blob *b = (struct blob *) calloc(1, sizeof(*b));
- int i;
- int mid;
-
- maxx *= SCALE;
- maxy *= SCALE;
- size *= SCALE;
-
- b->max_r = size/2;
- b->min_r = size/10;
-
- if (b->min_r < (5*SCALE)) b->min_r = (5*SCALE);
- mid = ((b->min_r + b->max_r) / 2);
-
- b->torque = get_float_resource ("torque", "Torque");
- b->elasticity = SCALE * get_float_resource ("elasticity", "Elasticity");
- b->max_velocity = SCALE * get_float_resource ("maxVelocity", "MaxVelocity");
-
- b->x = RAND(maxx);
- b->y = RAND(maxy);
-
- b->dx = RAND(b->max_velocity) * RANDSIGN();
- b->dy = RAND(b->max_velocity) * RANDSIGN();
- b->th = frand(M_PI+M_PI) * RANDSIGN();
- b->npoints = (random() % 5) + 5;
-
- b->spline = make_spline (b->npoints);
- b->r = (long *) malloc (sizeof(*b->r) * b->npoints);
- for (i = 0; i < b->npoints; i++)
- b->r[i] = ((random() % mid) + (mid/2)) * RANDSIGN();
- return b;
-}
-
-static void
-throb_blob (struct blob *b)
-{
- int i;
- double frac = ((M_PI+M_PI) / b->npoints);
-
- for (i = 0; i < b->npoints; i++)
- {
- long r = b->r[i];
- long ra = (r > 0 ? r : -r);
- double th = (b->th > 0 ? b->th : -b->th);
- long x, y;
-
- /* place control points evenly around perimiter, shifted by theta */
- x = b->x + ra * cos (i * frac + th);
- y = b->y + ra * sin (i * frac + th);
-
- b->spline->control_x[i] = x / SCALE;
- b->spline->control_y[i] = y / SCALE;
-
- /* alter the radius by a random amount, in the direction in which
- it had been going (the sign of the radius indicates direction.) */
- ra += (RAND(b->elasticity) * (r > 0 ? 1 : -1));
- r = ra * (r >= 0 ? 1 : -1);
-
- /* If we've reached the end (too long or too short) reverse direction. */
- if ((ra > b->max_r && r >= 0) ||
- (ra < b->min_r && r < 0))
- r = -r;
- /* And reverse direction in mid-course once every 50 times. */
- else if (! (random() % 50))
- r = -r;
-
- b->r[i] = r;
- }
-}
-
-static void
-move_blob (struct blob *b, int maxx, int maxy)
-{
- maxx *= SCALE;
- maxy *= SCALE;
-
- b->x += b->dx;
- b->y += b->dy;
-
- /* If we've reached the edge of the box, reverse direction. */
- if ((b->x > maxx && b->dx >= 0) ||
- (b->x < 0 && b->dx < 0))
- {
- b->dx = -b->dx;
- }
- if ((b->y > maxy && b->dy >= 0) ||
- (b->y < 0 && b->dy < 0))
- {
- b->dy = -b->dy;
- }
-
- /* Alter velocity randomly. */
- if (! (random() % 10))
- {
- b->dx += (RAND(b->max_velocity/2) * RANDSIGN());
- b->dy += (RAND(b->max_velocity/2) * RANDSIGN());
-
- /* Throttle velocity */
- if (b->dx > b->max_velocity || b->dx < -b->max_velocity)
- b->dx /= 2;
- if (b->dy > b->max_velocity || b->dy < -b->max_velocity)
- b->dy /= 2;
- }
-
- {
- double th = b->th;
- double d = (b->torque == 0 ? 0 : frand(b->torque));
- if (th < 0)
- th = -(th + d);
- else
- th += d;
-
- if (th > (M_PI+M_PI))
- th -= (M_PI+M_PI);
- else if (th < 0)
- th += (M_PI+M_PI);
-
- b->th = (b->th > 0 ? th : -th);
- }
-
- /* Alter direction of rotation randomly. */
- if (! (random() % 100))
- b->th *= -1;
-}
-
-static void
-draw_blob (Display *dpy, Drawable drawable, GC gc, struct blob *b,
- Bool fill_p)
-{
- compute_closed_spline (b->spline);
-#ifdef DEBUG
- {
- int i;
- for (i = 0; i < b->npoints; i++)
- XDrawLine (dpy, drawable, gc, b->x/SCALE, b->y/SCALE,
- b->spline->control_x[i], b->spline->control_y[i]);
- }
-#else
- if (fill_p)
- XFillPolygon (dpy, drawable, gc, b->spline->points, b->spline->n_points,
- Nonconvex, CoordModeOrigin);
- else
-#endif
- XDrawLines (dpy, drawable, gc, b->spline->points, b->spline->n_points,
- CoordModeOrigin);
-}
-
-
-static struct layer *
-make_layer (Display *dpy, Window window, int width, int height, int nblobs)
-{
- int i;
- struct layer *layer = (struct layer *) calloc(1, sizeof(*layer));
- int blob_min, blob_max;
- XGCValues gcv;
- layer->nblobs = nblobs;
-
- layer->blobs = (struct blob **) malloc(sizeof(*layer->blobs)*layer->nblobs);
-
- blob_max = (width < height ? width : height) / 2;
- blob_min = (blob_max * 2) / 3;
- for (i = 0; i < layer->nblobs; i++)
- layer->blobs[i] = make_blob (width, height,
- (random() % (blob_max-blob_min)) + blob_min);
-
- layer->pixmap = XCreatePixmap (dpy, window, width, height, 1);
- layer->gc = XCreateGC (dpy, layer->pixmap, 0, &gcv);
-
- return layer;
-}
-
-static void
-draw_layer_plane (Display *dpy, struct layer *layer, int width, int height)
-{
- int i;
- XSetForeground (dpy, layer->gc, 1L);
- XFillRectangle (dpy, layer->pixmap, layer->gc, 0, 0, width, height);
- XSetForeground (dpy, layer->gc, 0L);
- for (i = 0; i < layer->nblobs; i++)
- {
- throb_blob (layer->blobs[i]);
- move_blob (layer->blobs[i], width, height);
- draw_blob (dpy, layer->pixmap, layer->gc, layer->blobs[i], True);
- }
-}
-
-
-static void
-draw_layer_blobs (Display *dpy, Drawable drawable, GC gc,
- struct layer *layer, int width, int height,
- Bool fill_p)
-{
- int i;
- for (i = 0; i < layer->nblobs; i++)
- {
- throb_blob (layer->blobs[i]);
- move_blob (layer->blobs[i], width, height);
- draw_blob (dpy, drawable, gc, layer->blobs[i], fill_p);
- }
-}
-
-
-static struct goop *
-make_goop (Display *dpy, Window window, Colormap cmap,
- int width, int height, long depth)
-{
- int i;
- struct goop *goop = (struct goop *) calloc(1, sizeof(*goop));
- XGCValues gcv;
- int nblobs = get_integer_resource ("count", "Count");
-
- unsigned long *plane_masks = 0;
- unsigned long base_pixel = 0;
-
- goop->mode = (get_boolean_resource("xor", "Xor")
- ? xor
- : (get_boolean_resource("transparent", "Transparent")
- ? transparent
- : opaque));
-
- goop->width = width;
- goop->height = height;
-
-
- goop->nlayers = get_integer_resource ("planes", "Planes");
- if (goop->nlayers <= 0)
- goop->nlayers = (random() % (depth-2)) + 2;
- goop->layers = (struct layer **) malloc(sizeof(*goop->layers)*goop->nlayers);
-
-
- if (mono_p && goop->mode == transparent)
- goop->mode = opaque;
-
- /* Try to allocate some color planes before committing to nlayers.
- */
- if (goop->mode == transparent)
- {
- Bool additive_p = get_boolean_resource ("additive", "Additive");
- int nplanes = goop->nlayers;
- allocate_alpha_colors (dpy, cmap, &nplanes, additive_p, &plane_masks,
- &base_pixel);
- if (nplanes > 1)
- goop->nlayers = nplanes;
- else
- {
- fprintf (stderr,
- "%s: couldn't allocate any color planes; turning transparency off.\n",
- progname);
- goop->mode = opaque;
- }
- }
-
- {
- int lblobs[32];
- int total = DEF_COUNT;
- memset (lblobs, 0, sizeof(lblobs));
- if (nblobs <= 0)
- while (total)
- for (i = 0; total && i < goop->nlayers; i++)
- lblobs[i]++, total--;
- for (i = 0; i < goop->nlayers; i++)
- goop->layers[i] = make_layer (dpy, window, width, height,
- (nblobs > 0 ? nblobs : lblobs[i]));
- }
-
- if (goop->mode == transparent && plane_masks)
- {
- for (i = 0; i < goop->nlayers; i++)
- goop->layers[i]->pixel = base_pixel | plane_masks[i];
- goop->background = base_pixel;
- }
- if (plane_masks)
- free (plane_masks);
-
- if (goop->mode != transparent)
- {
- XColor color;
- color.flags = DoRed|DoGreen|DoBlue;
-
- goop->background =
- get_pixel_resource ("background", "Background", dpy,cmap);
-
- for (i = 0; i < goop->nlayers; i++)
- {
- int H = random() % 360; /* range 0-360 */
- double S = ((double) (random()%70) + 30)/100.0; /* range 30%-100% */
- double V = ((double) (random()%34) + 66)/100.0; /* range 66%-100% */
- hsv_to_rgb (H, S, V, &color.red, &color.green, &color.blue);
- if (XAllocColor (dpy, cmap, &color))
- goop->layers[i]->pixel = color.pixel;
- else
- goop->layers[i]->pixel =
- WhitePixelOfScreen(DefaultScreenOfDisplay(dpy));
- }
- }
-
- goop->pixmap = XCreatePixmap (dpy, window, width, height,
- (goop->mode == xor ? 1L : depth));
-
- gcv.background = goop->background;
- gcv.foreground = get_pixel_resource ("foreground", "Foreground", dpy, cmap);
- gcv.line_width = get_integer_resource ("thickness","Thickness");
- goop->pixmap_gc = XCreateGC (dpy, goop->pixmap, GCLineWidth, &gcv);
- goop->window_gc = XCreateGC (dpy, window, GCForeground|GCBackground, &gcv);
-
- return goop;
-}
-
-static struct goop *
-init_goop (Display *dpy, Window window)
-{
- XWindowAttributes xgwa;
- XGetWindowAttributes (dpy, window, &xgwa);
-
- return make_goop (dpy, window, xgwa.colormap,
- xgwa.width, xgwa.height, xgwa.depth);
-}
-
-static void
-run_goop (Display *dpy, Window window, struct goop *goop)
-{
- int i;
-
- switch (goop->mode)
- {
- case transparent:
-
- for (i = 0; i < goop->nlayers; i++)
- draw_layer_plane (dpy, goop->layers[i], goop->width, goop->height);
-
- XSetForeground (dpy, goop->pixmap_gc, goop->background);
- XSetPlaneMask (dpy, goop->pixmap_gc, AllPlanes);
- XFillRectangle (dpy, goop->pixmap, goop->pixmap_gc, 0, 0,
- goop->width, goop->height);
- XSetForeground (dpy, goop->pixmap_gc, ~0L);
- for (i = 0; i < goop->nlayers; i++)
- {
- XSetPlaneMask (dpy, goop->pixmap_gc, goop->layers[i]->pixel);
-/*
- XSetForeground (dpy, goop->pixmap_gc, ~0L);
- XFillRectangle (dpy, goop->pixmap, goop->pixmap_gc, 0, 0,
- goop->width, goop->height);
- XSetForeground (dpy, goop->pixmap_gc, 0L);
- */
- draw_layer_blobs (dpy, goop->pixmap, goop->pixmap_gc,
- goop->layers[i], goop->width, goop->height,
- True);
- }
- XCopyArea (dpy, goop->pixmap, window, goop->window_gc, 0, 0,
- goop->width, goop->height, 0, 0);
- break;
-
- case xor:
- XSetFunction (dpy, goop->pixmap_gc, GXcopy);
- XSetForeground (dpy, goop->pixmap_gc, 0);
- XFillRectangle (dpy, goop->pixmap, goop->pixmap_gc, 0, 0,
- goop->width, goop->height);
- XSetFunction (dpy, goop->pixmap_gc, GXxor);
- XSetForeground (dpy, goop->pixmap_gc, 1);
- for (i = 0; i < goop->nlayers; i++)
- draw_layer_blobs (dpy, goop->pixmap, goop->pixmap_gc,
- goop->layers[i], goop->width, goop->height,
- (goop->mode != outline));
- XCopyPlane (dpy, goop->pixmap, window, goop->window_gc, 0, 0,
- goop->width, goop->height, 0, 0, 1L);
- break;
-
- case opaque:
- case outline:
- XSetForeground (dpy, goop->pixmap_gc, goop->background);
- XFillRectangle (dpy, goop->pixmap, goop->pixmap_gc, 0, 0,
- goop->width, goop->height);
- for (i = 0; i < goop->nlayers; i++)
- {
- XSetForeground (dpy, goop->pixmap_gc, goop->layers[i]->pixel);
- draw_layer_blobs (dpy, goop->pixmap, goop->pixmap_gc,
- goop->layers[i], goop->width, goop->height,
- (goop->mode != outline));
- }
- XCopyArea (dpy, goop->pixmap, window, goop->window_gc, 0, 0,
- goop->width, goop->height, 0, 0);
- break;
-
- default:
- abort ();
- break;
- }
-}
-
-\f
-char *progclass = "Goop";
-
-char *defaults [] = {
- ".background: black",
- ".foreground: white",
- "*delay: 12000",
- "*transparent: true",
- "*additive: true",
- "*xor: false",
- "*count: 0",
- "*planes: 0",
- "*thickness: 5",
- "*torque: 0.0075",
- "*elasticity: 1.8",
- "*maxVelocity: 1.2",
- 0
-};
-
-XrmOptionDescRec options [] = {
- { "-delay", ".delay", XrmoptionSepArg, 0 },
- { "-count", ".count", XrmoptionSepArg, 0 },
- { "-planes", ".planes", XrmoptionSepArg, 0 },
- { "-transparent", ".transparent", XrmoptionNoArg, "True" },
- { "-non-transparent", ".transparent", XrmoptionNoArg, "False" },
- { "-additive", ".additive", XrmoptionNoArg, "True" },
- { "-subtractive", ".additive", XrmoptionNoArg, "false" },
- { "-xor", ".xor", XrmoptionNoArg, "true" },
- { "-no-xor", ".xor", XrmoptionNoArg, "false" },
- { "-thickness", ".thickness", XrmoptionSepArg, 0 },
- { "-torque", ".torque", XrmoptionSepArg, 0 },
- { "-elasticity", ".elasticity", XrmoptionSepArg, 0 },
- { "-max-velocity", ".maxVelocity", XrmoptionSepArg, 0 },
- { 0, 0, 0, 0 }
-};
-
-void
-screenhack (Display *dpy, Window window)
-{
- struct goop *g = init_goop (dpy, window);
- int delay = get_integer_resource ("delay", "Integer");
- while (1)
- {
- run_goop (dpy, window, g);
- XSync (dpy, False);
- screenhack_handle_events (dpy);
- if (delay) usleep (delay);
- }
-}
projects / xscreensaver / blobdiff