+++ /dev/null
-/* xscreensaver, Copyright (c) 1992, 1995, 1997, 1998, 1999
- * Jamie Zawinski <jwz@jwz.org>
- *
- * reaction/diffusion textures
- * Copyright (c) 1997 Scott Draves spot@transmeta.com
- * this code is derived from Bomb
- * see http://www.cs.cmu.edu/~spot/bomb.html
- *
- * 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.
- *
- * And remember: X Windows is to graphics hacking as roman numerals are to
- * the square root of pi.
- */
-
-#include <math.h>
-
-#include "screenhack.h"
-#include <X11/Xutil.h>
-
-#ifdef HAVE_XSHM_EXTENSION
-# include "xshm.h"
-#endif /* HAVE_XSHM_EXTENSION */
-
-/* costs ~6% speed */
-#define dither_when_mapped 1
-
-static int verbose;
-static int ncolors = 0;
-static XColor *colors = 0;
-static Display *display;
-static Visual *visual;
-#if dither_when_mapped
-static unsigned char *mc = 0;
-#endif
-static Colormap cmap = 0;
-static Window window;
-static int mapped;
-static int pdepth;
-static void random_colors(void);
-
-/* -----------------------------------------------------------
- pixel hack, 8-bit pixel grid, first/next frame interface
-
- pixack_init(int *size_h, int *size_v)
- pixack_frame(char *pix_buf)
- */
-
-
-#define bps 16
-#define mx ((1<<16)-1)
-
-/* you can replace integer mults wish shift/adds with these,
- but it doesn't help on my 586 */
-#define x5(n) ((n<<2)+n)
-#define x7(n) ((n<<3)-n)
-
-/* why strip bit? */
-#define R (ya_random()&((1<<30)-1))
-
-static int frame = 0, epoch_time;
-static ushort *r1, *r2, *r1b, *r2b;
-static int width, height, npix;
-static int radius;
-static int reaction = 0;
-static int diffusion = 0;
-
-/* returns number of pixels that the pixack produces. called once. */
-static void
-pixack_init(int *size_h, int *size_v)
-{
- int sz_base;
- width = get_integer_resource ("width", "Integer");
- height = get_integer_resource ("height", "Integer");
- sz_base = 80 + (R%40);
- if (width <= 0) width = (R%20) ? sz_base : (28 + R%10);
- if (height <= 0) height = (R%20) ? sz_base : (28 + R%10);
-
- /* jwz: when (and only when) XSHM is in use on an SGI 8-bit visual,
- we get shear unless width is a multiple of 4. I don't understand
- why. This is undoubtedly the wrong fix... */
- width &= ~0x7;
-
- /* don't go there */
- if (width < 10) width = 10;
- if (height < 10) height = 10;
- epoch_time = get_integer_resource ("epoch", "Integer");
- npix = (width + 2) * (height + 2);
- r1 = (ushort *) malloc(sizeof(ushort) * npix);
- r2 = (ushort *) malloc(sizeof(ushort) * npix);
- r1b = (ushort *) malloc(sizeof(ushort) * npix);
- r2b = (ushort *) malloc(sizeof(ushort) * npix);
-
- if (!r1 || !r2 || !r1b || !r2b) {
- fprintf(stderr, "not enough memory for %d pixels.\n", npix);
- exit(1);
- }
-
- *size_h = width;
- *size_v = height;
-}
-
-#define test_pattern_hyper 0
-
-
-/* returns the pixels. called many times. */
-static void
-pixack_frame(char *pix_buf)
-{
- int i, j;
- int w2 = width + 2;
- ushort *t;
-#if test_pattern_hyper
- if (frame&0x100)
- sleep(1);
-#endif
- if (verbose) {
- double tm = 0;
- struct timeval tp;
- if (!(frame%100)) {
- double tm2;
-#ifdef GETTIMEOFDAY_TWO_ARGS
- struct timezone tzp;
- gettimeofday(&tp, &tzp);
-#else
- gettimeofday(&tp);
-#endif
- tm2 = tp.tv_sec + tp.tv_usec * 1e-6;
- if (frame > 0)
- printf("fps = %2.4g\n", 100.0 / (tm2 - tm));
- tm = tm2;
- }
- }
- if (!(frame%epoch_time)) {
- int s;
- if (0 != frame) {
- int t = epoch_time / 500;
- if (t > 15)
- t = 15;
- sleep(t);
- }
-
- for (i = 0; i < npix; i++) {
- /* equilibrium */
- r1[i] = 65500;
- r2[i] = 11;
- }
-
- random_colors();
-
- XSetWindowBackground(display, window, colors[255 % ncolors].pixel);
- XClearWindow(display, window);
-
- s = w2 * (height/2) + width/2;
- radius = get_integer_resource ("radius", "Integer");
- {
- int maxr = width/2-2;
- int maxr2 = height/2-2;
- if (maxr2 < maxr) maxr = maxr2;
-
- if (radius < 0)
- radius = 1 + ((R%10) ? (R%5) : (R % maxr));
- if (radius > maxr) radius = maxr;
- }
- for (i = -radius; i < (radius+1); i++)
- for (j = -radius; j < (radius+1); j++)
- r2[s + i + j*w2] = mx - (R&63);
- reaction = get_integer_resource ("reaction", "Integer");
- if (reaction < 0 || reaction > 2) reaction = R&1;
- diffusion = get_integer_resource ("diffusion", "Integer");
- if (diffusion < 0 || diffusion > 2)
- diffusion = (R%5) ? ((R%3)?0:1) : 2;
- if (2 == reaction && 2 == diffusion)
- reaction = diffusion = 0;
-
- if (verbose)
- printf("reaction = %d\ndiffusion = %d\nradius = %d\n",
- reaction, diffusion, radius);
- }
- for (i = 0; i <= width+1; i++) {
- r1[i] = r1[i + w2 * height];
- r2[i] = r2[i + w2 * height];
- r1[i + w2 * (height + 1)] = r1[i + w2];
- r2[i + w2 * (height + 1)] = r2[i + w2];
- }
- for (i = 0; i <= height+1; i++) {
- r1[w2 * i] = r1[width + w2 * i];
- r2[w2 * i] = r2[width + w2 * i];
- r1[w2 * i + width + 1] = r1[w2 * i + 1];
- r2[w2 * i + width + 1] = r2[w2 * i + 1];
- }
- for (i = 0; i < height; i++) {
- int ii = i + 1;
- char *q = pix_buf + width * i;
- short *qq = ((short *) pix_buf) + width * i;
- long *qqq = ((long *) pix_buf) + width * i;
- ushort *i1 = r1 + 1 + w2 * ii;
- ushort *i2 = r2 + 1 + w2 * ii;
- ushort *o1 = r1b + 1 + w2 * ii;
- ushort *o2 = r2b + 1 + w2 * ii;
- for (j = 0; j < width; j++) {
-#if test_pattern_hyper
- int r1 = (i * j + (frame&127)*frame)&65535;
-#else
- int uvv, r1 = 0, r2 = 0;
- switch (diffusion) {
- case 0:
- r1 = i1[j] + i1[j+1] + i1[j-1] + i1[j+w2] + i1[j-w2];
- r1 = r1 / 5;
- r2 = (i2[j]<<3) + i2[j+1] + i2[j-1] + i2[j+w2] + i2[j-w2];
- r2 = r2 / 12;
- break;
- case 1:
- r1 = i1[j+1] + i1[j-1] + i1[j+w2] + i1[j-w2];
- r1 = r1 >> 2;
- r2 = (i2[j]<<2) + i2[j+1] + i2[j-1] + i2[j+w2] + i2[j-w2];
- r2 = r2 >> 3;
- break;
- case 2:
- r1 = (i1[j]<<1) + (i1[j+1]<<1) + (i1[j-1]<<1) + i1[j+w2] + i1[j-w2];
- r1 = r1 >> 3;
- r2 = (i2[j]<<2) + i2[j+1] + i2[j-1] + i2[j+w2] + i2[j-w2];
- r2 = r2 >> 3;
- break;
- }
-
- /* John E. Pearson "Complex Patterns in a Simple System"
- Science, July 1993 */
-
- uvv = (((r1 * r2) >> bps) * r2) >> bps;
- switch (reaction) { /* costs 4% */
- case 0:
- r1 += 4 * (((28 * (mx-r1)) >> 10) - uvv);
- r2 += 4 * (uvv - ((80 * r2) >> 10));
- break;
- case 1:
- r1 += 3 * (((27 * (mx-r1)) >> 10) - uvv);
- r2 += 3 * (uvv - ((80 * r2) >> 10));
- break;
- case 2:
- r1 += 2 * (((28 * (mx-r1)) >> 10) - uvv);
- r2 += 3 * (uvv - ((80 * r2) >> 10));
- break;
- }
- if (r1 > mx) r1 = mx;
- if (r2 > mx) r2 = mx;
- if (r1 < 0) r1 = 0;
- if (r2 < 0) r2 = 0;
- o1[j] = r1;
- o2[j] = r2;
-#endif
-
- /* this is terrible. here i want to assume ncolors = 256.
- should lose double indirection */
-
- if (mapped)
-#if dither_when_mapped
- q[j] = colors[mc[r1] % ncolors].pixel;
-#else
- q[j] = colors[(r1>>8) % ncolors].pixel;
-#endif
- else if (pdepth == 8)
- q[j] = colors[(r1>>8) % ncolors].pixel;
- else if (pdepth == 16)
-#if dither_when_mapped
- qq[j] = colors[mc[r1] % ncolors].pixel;
-#else
- qq[j] = colors[(r1>>8) % ncolors].pixel;
-#endif
- else if (pdepth == 32)
-#if dither_when_mapped
- qqq[j] = colors[mc[r1] % ncolors].pixel;
-#else
- qqq[j] = colors[(r1>>8) % ncolors].pixel;
-#endif
- else
- abort();
- }
- }
- t = r1; r1 = r1b; r1b = t;
- t = r2; r2 = r2b; r2b = t;
-}
-
-
-/* ------------- xscreensaver rendering -------------- */
-
-
-
-char *progclass = "RD";
-
-
-char *defaults [] = {
- ".background: black",
- ".foreground: white",
- "*width: 0", /* tried to use -1 but it complained */
- "*height: 0",
- "*epoch: 40000",
- "*reaction: -1",
- "*diffusion: -1",
- "*verbose: off",
- "*radius: -1",
- "*speed: 0.0",
- "*size: 1.0",
- "*delay: 1",
- "*colors: -1",
-#ifdef HAVE_XSHM_EXTENSION
- "*useSHM: True",
-#endif /* HAVE_XSHM_EXTENSION */
- 0
-};
-
-XrmOptionDescRec options [] = {
- { "-width", ".width", XrmoptionSepArg, 0 },
- { "-height", ".height", XrmoptionSepArg, 0 },
- { "-epoch", ".epoch", XrmoptionSepArg, 0 },
- { "-reaction", ".reaction", XrmoptionSepArg, 0 },
- { "-diffusion", ".diffusion", XrmoptionSepArg, 0 },
- { "-verbose", ".verbose", XrmoptionNoArg, "True" },
- { "-radius", ".radius", XrmoptionSepArg, 0 },
- { "-speed", ".speed", XrmoptionSepArg, 0 },
- { "-size", ".size", XrmoptionSepArg, 0 },
- { "-delay", ".delay", XrmoptionSepArg, 0 },
- { "-ncolors", ".colors", XrmoptionSepArg, 0 },
-#ifdef HAVE_XSHM_EXTENSION
- { "-shm", ".useSHM", XrmoptionNoArg, "True" },
- { "-no-shm", ".useSHM", XrmoptionNoArg, "False" },
-#endif /* HAVE_XSHM_EXTENSION */
- { 0, 0, 0, 0 }
-};
-
-
-static void
-random_colors(void)
-{
- memset(colors, 0, ncolors*sizeof(*colors));
- make_smooth_colormap (display, visual, cmap, colors, &ncolors,
- True, 0, True);
- if (ncolors <= 2) {
- mono_p = True;
- ncolors = 2;
- colors[0].flags = DoRed|DoGreen|DoBlue;
- colors[0].red = colors[0].green = colors[0].blue = 0;
- XAllocColor(display, cmap, &colors[0]);
- colors[1].flags = DoRed|DoGreen|DoBlue;
- colors[1].red = colors[1].green = colors[1].blue = 0xFFFF;
- XAllocColor(display, cmap, &colors[1]);
- }
-
- /* Scale it up so that there are exactly 255 colors -- that keeps the
- animation speed consistent, even when there aren't many allocatable
- colors, and prevents the -mono mode from looking like static. */
- if (ncolors != 255) {
- int i, n = 255;
- double scale = (double) ncolors / (double) (n+1);
- XColor *c2 = (XColor *) malloc(sizeof(*c2) * (n+1));
- for (i = 0; i < n; i++)
- c2[i] = colors[(int) (i * scale)];
- free(colors);
- colors = c2;
- ncolors = n;
- }
-
-}
-
-/* should factor into RD-specfic and compute-every-pixel general */
-void
-screenhack (Display *dpy, Window win)
-{
- GC gc;
- XGCValues gcv;
- XWindowAttributes xgwa;
- XImage *image;
- int array_width, array_height;
- double array_x, array_y;
- double array_dx, array_dy;
- int w2;
- char *p;
- int vdepth;
- int npix;
-#ifdef HAVE_XSHM_EXTENSION
- Bool use_shm = get_boolean_resource("useSHM", "Boolean");
- XShmSegmentInfo shm_info;
-#endif
-
- double delay = get_float_resource ("delay", "Float");
-
- display = dpy;
- window = win;
-
-
- XGetWindowAttributes (dpy, win, &xgwa);
- visual = xgwa.visual;
- pixack_init(&width, &height);
- {
- double s = get_float_resource ("size", "Float");
- double p = get_float_resource ("speed", "Float");
- if (s < 0.0 || s > 1.0)
- s = 1.0;
- s = sqrt(s);
- array_width = xgwa.width * s;
- array_height = xgwa.height * s;
- if (s < 0.99) {
- array_width = (array_width / width) * width;
- array_height = (array_height / height) * height;
- }
- if (array_width < width) array_width = width;
- if (array_height < height) array_height = height;
- array_x = (xgwa.width - array_width)/2;
- array_y = (xgwa.height - array_height)/2;
- array_dx = p;
- array_dy = .31415926 * p;
-
- /* start in a random direction */
- if (random() & 1) array_dx = -array_dx;
- if (random() & 1) array_dy = -array_dy;
-
- }
- verbose = get_boolean_resource ("verbose", "Boolean");
- npix = (width + 2) * (height + 2);
- w2 = width + 2;
- gcv.function = GXcopy;
- gc = XCreateGC(dpy, win, GCFunction, &gcv);
- vdepth = visual_depth(DefaultScreenOfDisplay(dpy), xgwa.visual);
-
- /* This code only deals with pixmap depths of 1, 8, 16, and 32.
- Therefore, we assume that those depths will be supported by the
- coresponding visual depths (that depth-24 displays accept depth-32
- pixmaps, and that depth-12 displays accept depth-16 pixmaps.) */
- pdepth = (vdepth == 1 ? 1 :
- vdepth <= 8 ? 8 :
- vdepth <= 16 ? 16 :
- 32);
-
- /* Ok, this like, sucks and stuff. There are some XFree86 systems
- that have depth-24 visuals, that do not accept depth-32 XImages!
- Which if you ask me is just absurd, since all it would take is
- for the server to truncate the bits in that case. So, this crap
- here detects the specific case of: we have chosen depth 32;
- and the server does not support depth 32. In that case, we
- try and use depth 16 instead.
-
- The real fix would be to rewrite this program to deal with
- depth 24 directly (or even better, arbitrary depths, but that
- would mean going through the XImage routines instead of messing
- with the XImage->data directly.)
-
- jwz, 18-Mar-99: well, the X servers I have access to these days do
- support 32-deep images on deep visuals, so I no longer have the
- ability to test this code -- but it was causing problems on the
- visuals that I do have, and I think that's because I mistakenly
- wrote `pfv[i].depth' when I meant to write `pfv[i].bits_per_pixel'.
- The symptom I was seeing was that the grid was 64x64, but the
- images were being drawn 32x32 -- so there was a black stripe on
- every other row. Wow, this code sucks so much.
- */
- if (pdepth == 32)
- {
- int i, pfvc = 0;
- Bool ok = False;
- XPixmapFormatValues *pfv = XListPixmapFormats (dpy, &pfvc);
- for (i = 0; i < pfvc; i++)
- if (pfv[i].bits_per_pixel == pdepth)
- ok = True;
- if (!ok)
- pdepth = 16;
- }
-
- cmap = xgwa.colormap;
- ncolors = get_integer_resource ("colors", "Integer");
-
- if (ncolors <= 0) {
- if (vdepth > 8)
- ncolors = 2047;
- else
- ncolors = 255;
- }
-
- if (mono_p || ncolors < 2) ncolors = 2;
- if (ncolors <= 2) mono_p = True;
- colors = (XColor *) malloc(sizeof(*colors) * (ncolors+1));
-
- mapped = (vdepth <= 8 &&
- has_writable_cells(xgwa.screen, xgwa.visual));
-
- {
- int i, di;
- mc = (unsigned char *) malloc(1<<16);
- for (i = 0; i < (1<<16); i++) {
- di = (i + (random()&255))>>8;
- if (di > 255) di = 255;
- mc[i] = di;
- }
- }
-
- p = malloc(npix * (pdepth == 1 ? 1 : (pdepth / 8)));
- if (!p) {
- fprintf(stderr, "not enough memory for %d pixels.\n", npix);
- exit(1);
- }
-
- image = 0;
-
-#ifdef HAVE_XSHM_EXTENSION
- if (use_shm)
- {
- image = create_xshm_image(dpy, xgwa.visual, vdepth,
- ZPixmap, 0, &shm_info, width, height);
- if (!image)
- use_shm = False;
- else
- {
- free(p);
- p = image->data;
- }
- }
-#endif /* HAVE_XSHM_EXTENSION */
-
- if (!image)
- {
- image = XCreateImage(dpy, xgwa.visual, vdepth,
- ZPixmap, 0, p,
- width, height, 8, 0);
- }
-
- while (1) {
- Bool bump = False;
-
- int i, j;
- pixack_frame(p);
- for (i = 0; i < array_width; i += width)
- for (j = 0; j < array_height; j += height)
-#ifdef HAVE_XSHM_EXTENSION
- if (use_shm)
- XShmPutImage(dpy, win, gc, image, 0, 0, i+array_x, j+array_y,
- width, height, False);
- else
-#endif
- XPutImage(dpy, win, gc, image, 0, 0, i+array_x, j+array_y,
- width, height);
-
- array_x += array_dx;
- array_y += array_dy;
- if (array_x < 0) {
- array_x = 0;
- array_dx = -array_dx;
- bump = True;
- } else if (array_x > (xgwa.width - array_width)) {
- array_x = (xgwa.width - array_width);
- array_dx = -array_dx;
- bump = True;
- }
- if (array_y < 0) {
- array_y = 0;
- array_dy = -array_dy;
- bump = True;
- } else if (array_y > (xgwa.height - array_height)) {
- array_y = (xgwa.height - array_height);
- array_dy = -array_dy;
- bump = True;
- }
-
- if (bump) {
- if (random() & 1) {
- double swap = array_dx;
- array_dx = array_dy;
- array_dy = swap;
- }
- }
-
- frame++;
-
- XSync(dpy, False);
- screenhack_handle_events (dpy);
- if (delay > 0)
- usleep(1000 * delay);
- }
-}
projects / xscreensaver / blobdiff