1 /* -*- Mode: C; tab-width: 4 -*- */
2 /* vim: set ai ts=4 sw=4: */
5 /*static const char sccsid[] = "@(#)gleidescope.c 1.0 03/06/27 xlockmore";*/
8 /* enable -grab switch for animations */
11 #undef DISPLAY_TEXTURE
14 * Permission to use, copy, modify, and distribute this software and its
15 * documentation for any purpose and without fee is hereby granted,
16 * provided that the above copyright notice appear in all copies and that
17 * both that copyright notice and this permission notice appear in
18 * supporting documentation.
20 * This file is provided AS IS with no warranties of any kind. The author
21 * shall have no liability with respect to the infringement of copyrights,
22 * trade secrets or any patents by this file or any part thereof. In no
23 * event will the author be liable for any lost revenue or profits or
24 * other special, indirect and consequential damages.
28 * 20030627 1.0 acd First Release.
29 * Texture loading code from 'glplanet'
30 * by Jamie Zawinski <jwz@jwz.org>
31 * 20030810 1.1 acd Added size flag.
32 * Now grabs screen / video / picture
33 * (uses code from 'glslideshow' by
34 * Mike Oliphant, Ben Buxton, Jamie Zawinski).
37 * Added fade code (also from glslideshow).
38 * 20031013 1.2 acd Migrated to compile without warnings under
40 * 20031023 1.3 acd Better code to limit twisting speeds.
41 * Tweaked initial rotation values.
42 * Move, Rotate, Zoom now chosen at random if
43 * no preference is given.
44 * Made grid slightly bigger so you can't see
45 * the edge when zooming and moving.
46 * 20061226 1.4 acd Now uses GL Display Lists.
47 * 20070318 1.5 acd Generates textures.
48 * Fixed texture size problem (and introduced another).
49 * 20070412 1.6 acd Textures now have independant sizes.
50 * 20070413 1.7 acd Added Lissajous movement pattern.
51 * 20070414 1.8 acd Added corners movement pattern.
52 * 20080319 1.9 acd Changes to arguments for saner gleidescope.xml.
55 * generate textures myself - render random shapes to 256x256 texture. (done)
56 * lower res for checks and random - use 256 and 4x4 or 8x8 pixels. (disabled for now)
57 * gnome-saver doesn't let you specify source directory so add that to this.
58 * image loading routine is too slow - rotation grinds to a halt - stop using it. (better in version 5)
59 * image loading also looks bad for non-square images - edges are black. (fixed)
60 * possible to see edge of the world on widescreen terminals - use larger grid and hidden hex removal?
61 * fading textures may have different max_tx - use two sets. (done)
62 * choice of movement patterns. (3 implemented, chooseable at compile time)
63 * look into rangle and tangle.
67 **----------------------------------------------------------------------------
69 **----------------------------------------------------------------------------
75 "*showFPS: False \n" \
78 "*suppressRotationAnimation: True\n" \
80 # define refresh_gleidescope 0
81 # include "xlockmore.h" /* from the xscreensaver distribution */
82 #else /* !STANDALONE */
83 # include "xlock.h" /* from the xlockmore distribution */
84 #endif /* !STANDALONE */
89 #include "xpm-ximage.h"
90 #include "grab-ximage.h"
93 void grab_frame(Display *display, Window window);
96 /* acd TODO should all these be in gleidestruct? */
97 /* they can't be, because of the idiotic way the xlockmore "argtype vars"
98 interface works. -jwz */
100 static Bool grab; /* grab images */
102 static Bool move; /* moving camera */
103 static Bool nomove; /* no moving camera */
104 static Bool rotate; /* rotate in place */
105 static Bool norotate; /* no rotate in place */
106 static Bool zoom; /* zooming camera */
107 static Bool nozoom; /* no zooming camera */
108 static char *image; /* name of texture to load */
109 static int duration; /* length of time to display grabbed image */
111 #define MAX_CAM_SPEED 1.0
112 #define MAX_ANGLE_VEL 1.0
113 #define INITIAL_ANGLE_VEL 0.2
114 #define INITIAL_ANGLE_ACC 0.001
115 #define TWISTING_PROBABILITY 1000 /* 1 in ... of change of acceleration */
117 #define RADIANS (M_PI / 180)
118 #define ANGLE_120 (M_PI * 2 / 3)
119 #define ANGLE_240 (M_PI * 4 / 3)
121 #define DEF_GRAB "False"
122 #define DEF_MOVE "False"
123 #define DEF_NOMOVE "False"
124 #define DEF_ROTATE "False"
125 #define DEF_NOROTATE "False"
126 #define DEF_ZOOM "False"
127 #define DEF_NOZOOM "False"
128 #define DEF_IMAGE "DEFAULT"
129 #define DEF_DURATION "30"
132 static XrmOptionDescRec opts[] =
135 {"-grab", ".gleidescope.grab", XrmoptionNoArg, "true"},
137 {"-move", ".gleidescope.move", XrmoptionNoArg, "true"},
138 {"-no-move", ".gleidescope.nomove", XrmoptionNoArg, "true"},
139 {"-rotate", ".gleidescope.rotate", XrmoptionNoArg, "true"},
140 {"-no-rotate", ".gleidescope.norotate", XrmoptionNoArg, "true"},
141 {"-zoom", ".gleidescope.zoom", XrmoptionNoArg, "true"},
142 {"-no-zoom", ".gleidescope.nozoom", XrmoptionNoArg, "true"},
143 {"-image", ".gleidescope.image", XrmoptionSepArg, "DEFAULT"},
144 {"-duration", ".gleidescope.duration", XrmoptionSepArg, "30"},
148 static argtype vars[] = {
150 {&grab, "grab", "Grab", DEF_GRAB, t_Bool},
152 {&move, "move", "Move", DEF_MOVE, t_Bool},
153 {&nomove, "nomove", "noMove", DEF_NOMOVE, t_Bool},
154 {&rotate, "rotate", "Rotate", DEF_ROTATE, t_Bool},
155 {&norotate, "norotate", "noRotate", DEF_NOROTATE, t_Bool},
156 {&zoom, "zoom", "Zoom", DEF_ZOOM, t_Bool},
157 {&nozoom, "nozoom", "noZoom", DEF_NOZOOM, t_Bool},
158 {&image, "image", "Image", DEF_IMAGE, t_String},
159 {&duration, "duration", "Duration", DEF_DURATION, t_Int},
162 static OptionStruct desc[] = {
164 {"-grab", "grab images to create animation"},
166 {"-move", "camera will move"},
167 {"-no-move", "camera won't move"},
168 {"-rotate", "camera will rotate"},
169 {"-no-rotate", "camera won't rotate"},
170 {"-zoom", "camera will zoom"},
171 {"-no-zoom", "camera won't zoom"},
172 {"-image", "xpm / xbm image file to use for texture"},
173 {"-duration", "length of time texture will be used"},
176 ENTRYPOINT ModeSpecOpt gleidescope_opts = {
177 sizeof opts / sizeof opts[0], opts,
178 sizeof vars / sizeof vars[0], vars,
183 ModStruct gleidescope_description = {
184 "gleidescope", "init_gleidescope", "draw_gleidescope", "release_gleidescope",
185 "draw_gleidescope", "init_gleidescope", NULL, &gleidescope_opts,
186 1000, 1, 2, 1, 4, 1.0, "",
187 "GL Kaleidescope", 0, NULL};
191 **-----------------------------------------------------------------------------
193 **-----------------------------------------------------------------------------
196 typedef struct hex_s {
197 GLfloat x, y, z; /* position */
212 GLuint id; /* opengl texture id */
213 GLfloat width, height; /* texture width and height */
214 GLfloat min_tx, min_ty; /* minimum texture sizes */
215 GLfloat max_tx, max_ty; /* maximum texture sizes */
219 Bool waiting_for_image_p;
220 /* r_phase is for triangle rotation speed */
221 GLfloat x_period, y_period, r_period;
222 GLfloat x_phase, y_phase, r_phase;
225 #define MAX_FADE 500 /* number of fade cycles */
228 float cam_x_speed, cam_z_speed, cam_y_speed;
229 int cam_x_phase, cam_z_phase, cam_y_phase;
231 GLXContext *glx_context;
233 texture textures[2]; /* texture handles */
234 GLuint visible; /* index for current texture */
242 float tangle; /* texture angle (degrees) */
243 float tangle_vel; /* texture velocity */
244 float tangle_acc; /* texture acceleration */
246 float rangle; /* rotate angle */
247 float rangle_vel; /* rotate velocity */
248 float rangle_acc; /* rotate acceleration */
257 Bool waiting_for_image_p;
261 #define frandrange(x, y) (x + frand(y - x))
263 #define XOFFSET (0.8660254f) /* sin 60' */
264 #define YOFFSET (1.5000000f) /* cos 60' + 1 */
270 /* generates a grid with edges of given size */
271 /* acd TODO - replace hex[] with this and allow size and distance as parameters */
274 generate_grid(int size)
281 for (y = -size ; y <= size ; y++) {
282 for (x = -i ; x <= i ; x += 2) {
283 printf("{XOFFSET * %d, YOFFSET * %d, 0},\n", x, y);
296 /* acd - this is terrible - 120+ hexes */
297 static const hex_t hex[] = {
298 /* edges of size 7 */
299 /* number of hexagons required to cover screen depends on camera distance */
300 /* at a distance of 10 this is just about enough. */
301 {XOFFSET * -6, YOFFSET * -6, 0},
302 {XOFFSET * -4, YOFFSET * -6, 0},
303 {XOFFSET * -2, YOFFSET * -6, 0},
304 {XOFFSET * 0, YOFFSET * -6, 0},
305 {XOFFSET * 2, YOFFSET * -6, 0},
306 {XOFFSET * 4, YOFFSET * -6, 0},
307 {XOFFSET * 6, YOFFSET * -6, 0},
309 {XOFFSET * -7, YOFFSET * -5, 0},
310 {XOFFSET * -5, YOFFSET * -5, 0},
311 {XOFFSET * -3, YOFFSET * -5, 0},
312 {XOFFSET * -1, YOFFSET * -5, 0},
313 {XOFFSET * 1, YOFFSET * -5, 0},
314 {XOFFSET * 3, YOFFSET * -5, 0},
315 {XOFFSET * 5, YOFFSET * -5, 0},
316 {XOFFSET * 7, YOFFSET * -5, 0},
318 {XOFFSET * -8, YOFFSET * -4, 0},
319 {XOFFSET * -6, YOFFSET * -4, 0},
320 {XOFFSET * -4, YOFFSET * -4, 0},
321 {XOFFSET * -2, YOFFSET * -4, 0},
322 {XOFFSET * 0, YOFFSET * -4, 0},
323 {XOFFSET * 2, YOFFSET * -4, 0},
324 {XOFFSET * 4, YOFFSET * -4, 0},
325 {XOFFSET * 6, YOFFSET * -4, 0},
326 {XOFFSET * 8, YOFFSET * -4, 0},
328 {XOFFSET * -9, YOFFSET * -3, 0},
329 {XOFFSET * -7, YOFFSET * -3, 0},
330 {XOFFSET * -5, YOFFSET * -3, 0},
331 {XOFFSET * -3, YOFFSET * -3, 0},
332 {XOFFSET * -1, YOFFSET * -3, 0},
333 {XOFFSET * 1, YOFFSET * -3, 0},
334 {XOFFSET * 3, YOFFSET * -3, 0},
335 {XOFFSET * 5, YOFFSET * -3, 0},
336 {XOFFSET * 7, YOFFSET * -3, 0},
337 {XOFFSET * 9, YOFFSET * -3, 0},
339 {XOFFSET * -10, YOFFSET * -2, 0},
340 {XOFFSET * -8, YOFFSET * -2, 0},
341 {XOFFSET * -6, YOFFSET * -2, 0},
342 {XOFFSET * -4, YOFFSET * -2, 0},
343 {XOFFSET * -2, YOFFSET * -2, 0},
344 {XOFFSET * 0, YOFFSET * -2, 0},
345 {XOFFSET * 2, YOFFSET * -2, 0},
346 {XOFFSET * 4, YOFFSET * -2, 0},
347 {XOFFSET * 6, YOFFSET * -2, 0},
348 {XOFFSET * 8, YOFFSET * -2, 0},
349 {XOFFSET * 10, YOFFSET * -2, 0},
351 {XOFFSET * -11, YOFFSET * -1, 0},
352 {XOFFSET * -9, YOFFSET * -1, 0},
353 {XOFFSET * -7, YOFFSET * -1, 0},
354 {XOFFSET * -5, YOFFSET * -1, 0},
355 {XOFFSET * -3, YOFFSET * -1, 0},
356 {XOFFSET * -1, YOFFSET * -1, 0},
357 {XOFFSET * 1, YOFFSET * -1, 0},
358 {XOFFSET * 3, YOFFSET * -1, 0},
359 {XOFFSET * 5, YOFFSET * -1, 0},
360 {XOFFSET * 7, YOFFSET * -1, 0},
361 {XOFFSET * 9, YOFFSET * -1, 0},
362 {XOFFSET * 11, YOFFSET * -1, 0},
364 {XOFFSET * -12, YOFFSET * 0, 0},
365 {XOFFSET * -10, YOFFSET * 0, 0},
366 {XOFFSET * -8, YOFFSET * 0, 0},
367 {XOFFSET * -6, YOFFSET * 0, 0},
368 {XOFFSET * -4, YOFFSET * 0, 0},
369 {XOFFSET * -2, YOFFSET * 0, 0},
370 {XOFFSET * 0, YOFFSET * 0, 0},
371 {XOFFSET * 2, YOFFSET * 0, 0},
372 {XOFFSET * 4, YOFFSET * 0, 0},
373 {XOFFSET * 6, YOFFSET * 0, 0},
374 {XOFFSET * 8, YOFFSET * 0, 0},
375 {XOFFSET * 10, YOFFSET * 0, 0},
376 {XOFFSET * 12, YOFFSET * 0, 0},
378 {XOFFSET * -11, YOFFSET * 1, 0},
379 {XOFFSET * -9, YOFFSET * 1, 0},
380 {XOFFSET * -7, YOFFSET * 1, 0},
381 {XOFFSET * -5, YOFFSET * 1, 0},
382 {XOFFSET * -3, YOFFSET * 1, 0},
383 {XOFFSET * -1, YOFFSET * 1, 0},
384 {XOFFSET * 1, YOFFSET * 1, 0},
385 {XOFFSET * 3, YOFFSET * 1, 0},
386 {XOFFSET * 5, YOFFSET * 1, 0},
387 {XOFFSET * 7, YOFFSET * 1, 0},
388 {XOFFSET * 9, YOFFSET * 1, 0},
389 {XOFFSET * 11, YOFFSET * 1, 0},
391 {XOFFSET * -10, YOFFSET * 2, 0},
392 {XOFFSET * -8, YOFFSET * 2, 0},
393 {XOFFSET * -6, YOFFSET * 2, 0},
394 {XOFFSET * -4, YOFFSET * 2, 0},
395 {XOFFSET * -2, YOFFSET * 2, 0},
396 {XOFFSET * 0, YOFFSET * 2, 0},
397 {XOFFSET * 2, YOFFSET * 2, 0},
398 {XOFFSET * 4, YOFFSET * 2, 0},
399 {XOFFSET * 6, YOFFSET * 2, 0},
400 {XOFFSET * 8, YOFFSET * 2, 0},
401 {XOFFSET * 10, YOFFSET * 2, 0},
403 {XOFFSET * -9, YOFFSET * 3, 0},
404 {XOFFSET * -7, YOFFSET * 3, 0},
405 {XOFFSET * -5, YOFFSET * 3, 0},
406 {XOFFSET * -3, YOFFSET * 3, 0},
407 {XOFFSET * -1, YOFFSET * 3, 0},
408 {XOFFSET * 1, YOFFSET * 3, 0},
409 {XOFFSET * 3, YOFFSET * 3, 0},
410 {XOFFSET * 5, YOFFSET * 3, 0},
411 {XOFFSET * 7, YOFFSET * 3, 0},
412 {XOFFSET * 9, YOFFSET * 3, 0},
414 {XOFFSET * -8, YOFFSET * 4, 0},
415 {XOFFSET * -6, YOFFSET * 4, 0},
416 {XOFFSET * -4, YOFFSET * 4, 0},
417 {XOFFSET * -2, YOFFSET * 4, 0},
418 {XOFFSET * 0, YOFFSET * 4, 0},
419 {XOFFSET * 2, YOFFSET * 4, 0},
420 {XOFFSET * 4, YOFFSET * 4, 0},
421 {XOFFSET * 6, YOFFSET * 4, 0},
422 {XOFFSET * 8, YOFFSET * 4, 0},
424 {XOFFSET * -7, YOFFSET * 5, 0},
425 {XOFFSET * -5, YOFFSET * 5, 0},
426 {XOFFSET * -3, YOFFSET * 5, 0},
427 {XOFFSET * -1, YOFFSET * 5, 0},
428 {XOFFSET * 1, YOFFSET * 5, 0},
429 {XOFFSET * 3, YOFFSET * 5, 0},
430 {XOFFSET * 5, YOFFSET * 5, 0},
431 {XOFFSET * 7, YOFFSET * 5, 0},
433 {XOFFSET * -6, YOFFSET * 6, 0},
434 {XOFFSET * -4, YOFFSET * 6, 0},
435 {XOFFSET * -2, YOFFSET * 6, 0},
436 {XOFFSET * 0, YOFFSET * 6, 0},
437 {XOFFSET * 2, YOFFSET * 6, 0},
438 {XOFFSET * 4, YOFFSET * 6, 0},
439 {XOFFSET * 6, YOFFSET * 6, 0},
443 **----------------------------------------------------------------------------
445 **----------------------------------------------------------------------------
448 static gleidestruct *gleidescope = NULL;
452 *load defaults in config structure
454 static void setdefaultconfig(void)
467 gleidescope_handle_event(ModeInfo *mi, XEvent *event)
469 gleidestruct *gp = &gleidescope[MI_SCREEN(mi)];
472 printf("event:%d\n", event->xany.type);
473 printf("button:%d\n", event->xbutton.button);
475 if (event->xany.type == ButtonPress)
477 if (event->xbutton.button == Button1 ||
478 event->xbutton.button == Button3)
480 /* store initial values of mouse */
481 gp->xstart = event->xbutton.x;
482 gp->ystart = event->xbutton.y;
485 gp->button_down_p = True;
489 else if (event->xbutton.button == Button4)
494 else if (event->xbutton.button == Button5)
500 } else if (event->xany.type == ButtonRelease)
502 if (event->xbutton.button == Button1 ||
503 event->xbutton.button == Button3)
506 gp->button_down_p = False;
509 } else if (event->xany.type == MotionNotify)
511 if (gp->button_down_p)
513 /* update mouse position */
514 gp->xmouse += (double)(event->xmotion.x - gp->xstart) / MI_WIDTH(mi);
515 gp->ymouse += (double)(event->xmotion.y - gp->ystart) / MI_HEIGHT(mi);
516 gp->xstart = event->xmotion.x;
517 gp->ystart = event->xmotion.y;
522 else if (screenhack_event_helper (MI_DISPLAY(mi), MI_WINDOW(mi), event))
534 image_loaded_cb (const char *filename, XRectangle *geometry,
535 int image_width, int image_height,
536 int texture_width, int texture_height,
539 texture *tp = (texture *) closure;
542 gp->max_tx = (GLfloat) image_width / texture_width;
543 gp->max_ty = (GLfloat) image_height / texture_height;
546 /* new - taken from flipscreen */
547 tp->width = texture_width;
548 tp->height = texture_height;
549 tp->min_tx = (GLfloat) geometry->x / tp->width;
550 tp->min_ty = (GLfloat) geometry->y / tp->height;
551 tp->max_tx = (GLfloat) (geometry->x + geometry->width) / tp->width;
552 tp->max_ty = (GLfloat) (geometry->y + geometry->height) / tp->height;
555 printf("Image w,h: (%d, %d)\n", image_width, image_height);
556 printf("Texture w,h: (%d, %d)\n", texture_width, texture_height);
557 printf("Geom x,y: (%d, %d)\n", geometry->x, geometry->y);
558 printf("Geom w,h: (%d, %d)\n", geometry->width, geometry->height);
559 printf("Max Tx,Ty: (%f, %f)\n", tp->max_tx, tp->max_ty);
562 glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
563 glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
564 (tp->mipmap_p ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR));
566 tp->waiting_for_image_p = False;
567 tp->start_time = time ((time_t *) 0);
571 getSnapshot(ModeInfo *mi, texture *texture)
573 gleidestruct *gp = &gleidescope[MI_SCREEN(mi)];
576 printf("getSnapshot");
579 if (MI_IS_WIREFRAME(mi))
583 load_texture_async (mi->xgwa.screen, mi->window,
584 *gp->glx_context, 0, 0, gp->mipmap_p,
585 texture->id, image_loaded_cb, texture);
586 texture->start_time = time((time_t *)0);
589 #define TEXTURE_SIZE 256
592 plot(unsigned char *buffer, int x, int y, int r, int g, int b, int a) {
594 if (x < 0 || x >= TEXTURE_SIZE || y < 0 || y >= TEXTURE_SIZE) {
597 c = ((x * TEXTURE_SIZE) + y) * 4;
598 /*printf("(%d,%d)[%d]\n", x, y, c);*/
607 plot2(unsigned char *buffer, int x, int y, int r, int g, int b, int a) {
609 if (x < 0 || x >= TEXTURE_SIZE || y < 0 || y >= TEXTURE_SIZE) {
612 c = ((x * TEXTURE_SIZE) + y) * 4;
613 /*printf("(%d,%d)[%d]\n", x, y, c);*/
619 if (y + 1 < TEXTURE_SIZE) {
626 if (x + 1 < TEXTURE_SIZE) {
627 c += (TEXTURE_SIZE * 4);
632 if (y + 1 < TEXTURE_SIZE) {
642 /* draw geometric shapes to texture */
643 /* modifies passed in buffer */
645 draw_shapes (unsigned char *buffer) {
652 for (i = 0 ; i < TEXTURE_SIZE * TEXTURE_SIZE * 4 ; i += 4) {
653 buffer[i + 0] = 0x00;
654 buffer[i + 1] = 0x00;
655 buffer[i + 2] = 0x00;
656 buffer[i + 3] = 0xff;
659 for (s = 0 ; s < 25 ; s++) {
660 int shape = random() % 3;
663 int r = (random() & 0xff);
664 int g = (random() & 0xff);
665 int b = (random() & 0xff);
670 x = (random() % TEXTURE_SIZE) - (TEXTURE_SIZE / 4); /* top left */
671 y = (random() % TEXTURE_SIZE) - (TEXTURE_SIZE / 4);
672 w = 10 + random() % (TEXTURE_SIZE / 4); /* size */
673 h = 10 + random() % (TEXTURE_SIZE / 4);
675 printf("Rectangle: (%d, %d)(%d, %d)\n", x, y, w, h);
683 for (i = x ; i < x + w && i < TEXTURE_SIZE; i++) {
684 for (j = y ; j < y + h && j < TEXTURE_SIZE; j++) {
685 plot(buffer, i, j, r, g, b, a);
692 x = random() % TEXTURE_SIZE; /* centre */
693 y = random() % TEXTURE_SIZE;
694 h = 10 + random() % (TEXTURE_SIZE / 8); /* radius */
696 printf("Circle: %d, %d, %d\n", x, y, h);
698 for (i = 0 ; i < h ; i++) {
700 for (j = 0 ; j < h ; j++) {
703 printf("xdist: %d\n", xdist);
704 printf("ydist: %d\n", ydist);
705 printf("radius: %d\n", h * h);
707 if ((xdist + ydist) < (h * h)) {
708 plot(buffer, x + i, y + j, r, b, g, a);
709 /* check we haven't already done these */
711 plot(buffer, x + i, y - j, r, b, g, a);
714 plot(buffer, x - i, y + j, r, b, g, a);
716 plot(buffer, x - i, y - j, r, b, g, a);
726 x = random() % TEXTURE_SIZE; /* top */
727 y = random() % TEXTURE_SIZE;
728 h = 10 + random() % (TEXTURE_SIZE / 4); /* height */
730 printf("Triangle: %d, %d, %d\n", x, y, h);
734 for (i = 0 ; i < h ; i++) {
735 for (j = left ; j < right ; j++) {
736 plot(buffer, j, y + i, r, g, b, a);
747 setup_random_texture (ModeInfo *mi, texture *texture)
749 int width = 0, height = 0;
751 unsigned char *my_data = NULL;
755 int r0, g0, b0, a0, r1, g1, b1, a1;
759 printf("RandomTexture\n");
762 /* use this texture */
763 glBindTexture(GL_TEXTURE_2D, texture->id);
768 * code for various generated patterns - noise, stripes, checks etc.
769 * random geometric shapes looked the best.
773 style = random() & 0x3;
774 r0 = random() & 0xff;
775 g0 = random() & 0xff;
776 b0 = random() & 0xff;
778 r1 = random() & 0xff;
779 g1 = random() & 0xff;
780 b1 = random() & 0xff;
786 height = width = TEXTURE_SIZE;
787 my_data = (void *)malloc(width * height * 4);
788 for (i = 0 ; i < width ; i += 2) {
789 for (j = 0 ; j < height ; j += 2) {
790 r0 = random() & 0xff;
791 g0 = random() & 0xff;
792 b0 = random() & 0xff;
794 plot2(my_data, i, j, r0, g0, b0, a0);
804 height = width = TEXTURE_SIZE;
805 my_data = (void *)malloc(width * height * 4);
806 draw_shapes(my_data);
812 height = width = TEXTURE_SIZE;
813 my_data = (void *)malloc(width * height * 4);
814 for (i = 0 ; i < height ; i += 2) {
815 for (j = 0 ; j < width ; j += 2) {
816 if (((i + j) & 0x3) == 0) {
817 plot2(my_data, i, j, r0, g0, b0, a0);
819 plot2(my_data, i, j, r1, g1, b1, a1);
825 case 3: /* random stripes */
826 printf("Stripes 2\n");
827 height = width = TEXTURE_SIZE;
828 my_data = (void *)malloc(width * height * 4);
829 for (i = 0 ; i < height ; i += 2) {
830 r0 = random() & 0xff;
831 g0 = random() & 0xff;
832 b0 = random() & 0xff;
834 for (j = 0 ; j < width ; j += 2) {
835 plot2(my_data, i, j, r0, g0, b0, a0);
842 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
844 GL_RGBA, GL_UNSIGNED_BYTE, my_data);
845 sprintf (buf, "random texture: (%dx%d)",
849 /* setup parameters for texturing */
850 glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
851 glPixelStorei(GL_UNPACK_ROW_LENGTH, width);
853 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
854 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
855 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
856 if (random() & 0x1) {
857 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
858 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
860 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
861 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
864 if (my_data != NULL) {
869 /* use full texture */
871 texture->min_tx = 0.0;
872 texture->max_tx = 2.0;
873 texture->min_ty = 0.0;
874 texture->max_ty = 2.0;
875 texture->start_time = time((time_t *)0);
879 setup_file_texture (ModeInfo *mi, char *filename, texture *texture)
881 Display *dpy = mi->dpy;
882 Visual *visual = mi->xgwa.visual;
885 Colormap cmap = mi->xgwa.colormap;
886 XImage *image = xpm_file_to_ximage (dpy, visual, cmap, filename);
889 printf("FileTexture\n");
892 /* use this texture */
893 glBindTexture(GL_TEXTURE_2D, texture->id);
896 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
897 image->width, image->height, 0,
898 GL_RGBA, GL_UNSIGNED_BYTE, image->data);
899 sprintf (buf, "texture: %.100s (%dx%d)",
900 filename, image->width, image->height);
903 /* setup parameters for texturing */
904 glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
905 glPixelStorei(GL_UNPACK_ROW_LENGTH, image->width);
907 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
908 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
909 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
910 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
911 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
913 /* use full texture */
914 texture->min_tx = 0.0;
915 texture->max_tx = 1.0;
916 texture->min_ty = 0.0;
917 texture->max_ty = 1.0;
918 texture->start_time = time((time_t *)0);
922 setup_texture(ModeInfo * mi, texture *texture)
924 gleidestruct *gp = &gleidescope[MI_SCREEN(mi)];
926 if (!image || !*image || !strcmp(image, "DEFAULT")) {
927 /* no image specified - use system settings */
929 printf("SetupTexture: get_snapshot\n");
931 getSnapshot(mi, texture);
933 if (strcmp(image, "GENERATE") == 0) {
935 printf("SetupTexture: random_texture\n");
937 setup_random_texture(mi, texture);
939 /* use supplied image file */
941 printf("SetupTexture: file_texture\n");
943 setup_file_texture(mi, image, texture);
946 /* copy start time from texture */
947 gp->start_time = texture->start_time;
949 check_gl_error("texture initialization");
952 * resultant loaded image is upside down BUT
953 * it's a kaledescope and half of the hexagon is backwards anyway...
956 /* TODO: values for lissajous movement */
957 texture->x_period = frandrange(-2.0, 2.0);
958 texture->y_period = frandrange(-2.0, 2.0);
959 texture->r_period = frandrange(-2.0, 2.0);
960 texture->x_phase = frand(M_PI * 2);
961 texture->y_phase = frand(M_PI * 2);
962 texture->r_phase = frand(M_PI * 2);
964 printf("XPeriod %f XPhase %f\n", texture->x_period, texture->x_phase);
965 printf("YPeriod %f YPhase %f\n", texture->y_period, texture->y_phase);
966 printf("RPeriod %f RPhase %f\n", texture->r_period, texture->r_phase);
970 #define VERTEX0 glVertex3f( 0.0000f, 0.000f, 0.0f);
971 #define VERTEX1 glVertex3f( 0.0000f, 1.000f, 0.0f);
972 #define VERTEX2 glVertex3f( XOFFSET, 0.500f, 0.0f);
973 #define VERTEX3 glVertex3f( XOFFSET, -0.500f, 0.0f);
974 #define VERTEX4 glVertex3f( 0.0000f, -1.000f, 0.0f);
975 #define VERTEX5 glVertex3f(-XOFFSET, -0.500f, 0.0f);
976 #define VERTEX6 glVertex3f(-XOFFSET, 0.500f, 0.0f);
979 ** Three different functions for calculating texture coordinates
980 ** which modify how the texture triangle moves over the source image.
985 /* the classic equilateral triangle rotating around centre */
987 calculate_texture_coords(ModeInfo *mi, texture *texture, vector2f t[3]) {
989 gleidestruct *gp = &gleidescope[MI_SCREEN(mi)];
990 GLfloat centre_x = 0.5;
991 GLfloat centre_y = 0.5;
992 GLfloat radius_x = (texture->max_tx - texture->min_tx) / 2;
993 GLfloat radius_y = (texture->max_ty - texture->min_ty) / 2;
999 t[1].x = centre_x + .95 * radius_x * cos((gp->ymouse * 2 * M_PI) + (gp->tangle * RADIANS));
1000 t[1].y = centre_y + .95 * radius_y * sin((gp->ymouse * 2 * M_PI) + (gp->tangle * RADIANS));
1002 /* t[2] is always 60' further around than t2 */
1003 tangle2 = (gp->ymouse * 2 * M_PI) + (gp->tangle * RADIANS) + (M_PI * 2 / 6);
1004 t[2].x = centre_x + .95 * radius_x * cos(tangle2);
1005 t[2].y = centre_y + .95 * radius_y * sin(tangle2);
1007 printf("texcoords:[%f,%f]->[%f,%f](%f,%f)\n", t[0].x, t[0].y, t[1].x, t[1].y, texture->max_tx, texture->max_ty);
1013 /* new lissajous movement pattern */
1015 calculate_texture_coords(ModeInfo *mi, texture *texture, vector2f t[3]) {
1017 /* equilateral triangle rotating around centre */
1018 gleidestruct *gp = &gleidescope[MI_SCREEN(mi)];
1019 GLfloat width = texture->max_tx - texture->min_tx;
1020 GLfloat height = texture->max_ty - texture->min_ty;
1022 GLfloat centre_x = texture->min_tx + (width * .5);
1023 GLfloat centre_y = texture->min_ty + (height * .5);
1024 /* m radius and t radius should be = .5 */
1025 /* triangle radius is 30% available space */
1026 GLfloat t_radius_x = width * .3;
1027 GLfloat t_radius_y = height * .3;
1028 /* movement radius is 30% available space */
1029 GLfloat m_radius_x = width * .2;
1030 GLfloat m_radius_y = height * .2;
1033 /* centre of triangle */
1034 GLfloat angle = (gp->ymouse * 2 * M_PI) + (gp->tangle * RADIANS); /* to radians */
1035 GLfloat t_centre_x = centre_x + m_radius_x * cos(texture->x_period * angle + texture->x_phase);
1036 GLfloat t_centre_y = centre_y + m_radius_y * sin(texture->y_period * angle + texture->y_phase);
1039 printf("WH: %f, %f - tWH: %f, %f\n", width, height, texture->width, texture->height);
1040 printf("size: (%f, %f)\n", width, height);
1041 printf("centre: (%f, %f)\n", centre_x, centre_y);
1044 angle2 = texture->r_period * angle + texture->r_phase;
1045 t[0].x = t_centre_x + t_radius_x * cos(angle2);
1046 t[0].y = t_centre_y + t_radius_y * sin(angle2);
1047 t[1].x = t_centre_x + t_radius_x * cos(angle2 + ANGLE_120);
1048 t[1].y = t_centre_y + t_radius_y * sin(angle2 + ANGLE_120);
1049 t[2].x = t_centre_x + t_radius_x * cos(angle2 + ANGLE_240);
1050 t[2].y = t_centre_y + t_radius_y * sin(angle2 + ANGLE_240);
1053 printf("texcoords:[%f,%f]->[%f,%f](%f,%f)\n", t[0].x, t[0].y, t[1].x, t[1].y, texture->max_tx, texture->max_ty);
1059 /* corners into corners - meant to maximise coverage */
1061 calculate_texture_coords(ModeInfo *mi, texture *texture, vector2f t[3]) {
1063 /* equilateral triangle rotating around centre */
1064 gleidestruct *gp = &gleidescope[MI_SCREEN(mi)];
1065 GLfloat width = texture->max_tx - texture->min_tx;
1066 GLfloat height = texture->max_ty - texture->min_ty;
1068 GLfloat centre_x = texture->min_tx + (width * .5);
1069 GLfloat centre_y = texture->min_ty + (height * .5);
1070 /* m radius and t radius should be = .5 */
1071 /* triangle radius calculated using maths 8) */
1072 #define TRADIUS (M_SQRT2 - 1.0)
1073 #define MRADIUS (1.0 - (M_SQRT2 / 2.0))
1074 GLfloat t_radius_x = width * TRADIUS * .95;
1075 GLfloat t_radius_y = height * TRADIUS * .95;
1076 /* movement radius also calculated using maths */
1077 GLfloat m_radius_x = width * MRADIUS * .95;
1078 GLfloat m_radius_y = height * MRADIUS * .95;
1079 GLfloat angle, angle2;
1080 GLfloat t_centre_x, t_centre_y;
1082 /* centre of triangle */
1083 angle = gp->tangle * RADIANS; /* to radians */
1084 t_centre_x = centre_x + m_radius_x * cos(angle);
1085 t_centre_y = centre_y + m_radius_y * sin(angle);
1087 printf("angle: %f, %f\n", angle, gp->tangle);
1088 printf("tcentre: %f,%f\n", t_centre_x, t_centre_y);
1089 printf("tradius: %f,%f\n", t_radius_x, t_radius_y);
1091 printf("size: (%f, %f)\n", width, height);
1092 printf("centre: (%f, %f)\n", centre_x, centre_y);
1093 printf("centre: (%f, %f)\n", centre_x, centre_y);
1094 printf("TRADIUS: %f\n", TRADIUS);
1095 printf("MRADIUS: %f\n", MRADIUS);
1098 /* angle2 is tied to tangle */
1099 angle2 = (180.0 - ((30.0 / 90.0) * gp->tangle)) * RADIANS;
1101 printf("Angle1: %f\tAngle2: %f\n", angle / RADIANS, angle2 / RADIANS);
1103 t[0].x = t_centre_x + t_radius_x * cos(angle2);
1104 t[0].y = t_centre_y + t_radius_y * sin(angle2);
1105 t[1].x = t_centre_x + t_radius_x * cos(angle2 + ANGLE_120);
1106 t[1].y = t_centre_y + t_radius_y * sin(angle2 + ANGLE_120);
1107 t[2].x = t_centre_x + t_radius_x * cos(angle2 + ANGLE_240);
1108 t[2].y = t_centre_y + t_radius_y * sin(angle2 + ANGLE_240);
1111 printf("texcoords:[%f,%f][%f,%f][%f,%f]\n", t[0].x, t[0].y, t[1].x, t[1].y, t[2].x, t[2].y);
1117 draw_hexagons(ModeInfo *mi, int translucency, texture *texture)
1122 gleidestruct *gp = &gleidescope[MI_SCREEN(mi)];
1124 calculate_texture_coords(mi, texture, t);
1126 glColor4f(1.0, 1.0, 1.0, (float)translucency / MAX_FADE);
1127 glEnable(GL_TEXTURE_2D);
1129 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
1130 glDepthMask(GL_FALSE);
1131 glBindTexture(GL_TEXTURE_2D, texture->id);
1133 if (gp->list == -1) {
1134 gp->list = glGenLists(1);
1137 /* compile new list */
1138 glNewList(gp->list, GL_COMPILE);
1139 glBegin(GL_TRIANGLES);
1142 ** six triangles to each hexagon
1145 glTexCoord2f(t[0].x, t[0].y);
1147 glTexCoord2f(t[1].x, t[1].y);
1149 glTexCoord2f(t[2].x, t[2].y);
1152 glTexCoord2f(t[0].x, t[0].y);
1154 glTexCoord2f(t[2].x, t[2].y);
1156 glTexCoord2f(t[1].x, t[1].y);
1159 glTexCoord2f(t[0].x, t[0].y);
1161 glTexCoord2f(t[1].x, t[1].y);
1163 glTexCoord2f(t[2].x, t[2].y);
1166 glTexCoord2f(t[0].x, t[0].y);
1168 glTexCoord2f(t[2].x, t[2].y);
1170 glTexCoord2f(t[1].x, t[1].y);
1173 glTexCoord2f(t[0].x, t[0].y);
1175 glTexCoord2f(t[1].x, t[1].y);
1177 glTexCoord2f(t[2].x, t[2].y);
1180 glTexCoord2f(t[0].x, t[0].y);
1182 glTexCoord2f(t[2].x, t[2].y);
1184 glTexCoord2f(t[1].x, t[1].y);
1190 /* call the list n times */
1191 for (i = 0 ; i < sizeof(hex) / sizeof(hex[0]) ; i++) {
1195 glTranslatef(hex[i].x, hex[i].y, 0.0);
1196 glCallList(gp->list);
1202 #ifdef DISPLAY_TEXTURE
1204 /* acd debug - display (bigger, centred) texture */
1205 glScalef(2.0, 2.0, 2.0);
1206 glTranslatef(-0.5, -0.5, 0.0);
1208 glTexCoord2f(0.0, 0.0);
1209 glVertex3f(0.0, 0.0, -0.1);
1210 glTexCoord2f(1.0, 0.0);
1211 glVertex3f(1.0, 0.0, -0.1);
1212 glTexCoord2f(1.0, 1.0);
1213 glVertex3f(1.0, 1.0, -0.1);
1214 glTexCoord2f(0.0, 1.0);
1215 glVertex3f(0.0, 1.0, -0.1);
1218 /* acd debug - display texture triangle */
1219 glColor4f(1.0, 0.5, 1.0, 1.0);
1220 glBegin(GL_LINE_LOOP);
1221 glVertex3f(t[0].x, t[0].y, -0.11);
1222 glVertex3f(t[1].x, t[1].y, -0.11);
1223 glVertex3f(t[2].x, t[2].y, -0.11);
1229 glDisable(GL_TEXTURE_2D);
1230 glDepthMask(GL_TRUE);
1231 glDisable(GL_BLEND);
1236 * main rendering loop
1241 GLfloat x_angle, y_angle, z_angle;
1242 gleidestruct *gp = &gleidescope[MI_SCREEN(mi)];
1245 mi->polygon_count = 0;
1247 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
1252 x_angle = gp->cam_x_phase + gp->tic * gp->cam_x_speed;
1253 y_angle = gp->cam_y_phase + gp->tic * gp->cam_y_speed;
1254 z_angle = gp->cam_z_phase + gp->tic * gp->cam_z_speed;
1257 v1.x = 1 * sin(x_angle);
1258 v1.y = 1 * sin(y_angle);
1264 /* size is changed in pinit() to be distance from plane */
1265 gp->size = MI_SIZE(mi);
1266 if (gp->size > 10) {
1269 if (gp->size <= 0) {
1273 /* user defined size */
1276 /* max distance given by adding the constant and the multiplier */
1277 v1.z = 5.0 + 3.0 * sin(z_angle);
1283 /* update rotation angle (but not if mouse button down) */
1284 if (rotate && !gp->button_down_p)
1286 float new_rangle_vel = 0.0;
1288 /* update camera rotation angle and velocity */
1289 gp->rangle += gp->rangle_vel;
1290 new_rangle_vel = gp->rangle_vel + gp->rangle_acc;
1291 if (new_rangle_vel > -MAX_ANGLE_VEL && new_rangle_vel < MAX_ANGLE_VEL)
1293 /* new velocity is within limits */
1294 gp->rangle_vel = new_rangle_vel;
1297 /* randomly change twisting speed - 3ff = 1024 */
1298 if ((random() % TWISTING_PROBABILITY) < 1.0) {
1299 gp->rangle_acc = INITIAL_ANGLE_ACC * frand(1.0);
1300 if (gp->rangle_vel > 0.0) {
1301 gp->rangle_acc = -gp->rangle_acc;
1306 printf("Rangle: %f : %f : %f\n", gp->rangle, gp->rangle_vel, gp->rangle_acc);
1307 printf("Tangle: %f : %f : %f\n", gp->tangle, gp->tangle_vel, gp->tangle_acc);
1311 /* this makes the image wobble - requires -move and a larger grid */
1312 gluLookAt(0, 0, v1.z, v1.x, v1.y, 0.0, 0.0, 1.0, 0.0);
1314 /* no wobble - camera always perpendicular to grid */
1316 /* rotating camera rather than entire space - smoother */
1320 sin((gp->xmouse * M_PI * 2) + gp->rangle * RADIANS),
1321 cos((gp->xmouse * M_PI * 2) + gp->rangle * RADIANS),
1325 # ifdef HAVE_MOBILE /* Keep it the same relative size when rotated. */
1327 GLfloat h = MI_HEIGHT(mi) / (GLfloat) MI_WIDTH(mi);
1328 int o = (int) current_device_rotation();
1329 if (o != 0 && o != 180 && o != -180)
1330 glScalef (1/h, 1/h, 1/h);
1337 mi->polygon_count +=
1338 draw_hexagons(mi, MAX_FADE, &gp->textures[gp->visible]);
1342 /* fading - show both textures with alpha
1343 NB first is always max alpha */
1344 mi->polygon_count +=
1345 draw_hexagons(mi, MAX_FADE, &gp->textures[1 - gp->visible]);
1346 mi->polygon_count +=
1347 draw_hexagons(mi, MAX_FADE - gp->fade, &gp->textures[gp->visible]);
1349 /* fade some more */
1352 /* have we faded enough? */
1353 if (gp->fade > MAX_FADE)
1357 gp->visible = 1 - gp->visible;
1361 /* increment texture angle based on time, velocity etc */
1362 /* but only if button is not down */
1363 if (!gp->button_down_p)
1365 float new_tangle_vel = 0.0;
1367 gp->tangle += gp->tangle_vel;
1369 /* work out new texture angle velocity */
1370 new_tangle_vel = gp->tangle_vel + gp->tangle_acc;
1371 if (new_tangle_vel > -MAX_ANGLE_VEL && new_tangle_vel < MAX_ANGLE_VEL)
1373 /* new velocity is inside limits */
1374 gp->tangle_vel = new_tangle_vel;
1377 /* randomly change twisting speed - 3ff = 1024 */
1378 if ((random() % TWISTING_PROBABILITY) < 1.0) {
1379 gp->tangle_acc = INITIAL_ANGLE_ACC * frand(1.0);
1380 if (gp->tangle_vel > 0.0) {
1381 gp->tangle_acc = -gp->tangle_acc;
1390 * new window size or exposure
1392 ENTRYPOINT void reshape_gleidescope(ModeInfo *mi, int width, int height)
1394 GLfloat h = (GLfloat) height / (GLfloat) width;
1396 glViewport(0, 0, (GLint) width, (GLint) height);
1397 glMatrixMode(GL_PROJECTION);
1399 gluPerspective(50.0, 1/h, 0.1, 2000.0);
1400 glMatrixMode (GL_MODELVIEW);
1406 pinit(ModeInfo * mi)
1408 gleidestruct *gp = &gleidescope[MI_SCREEN(mi)];
1410 /* set start time - star_time = 0 implies non-dynamic texture */
1411 gp->start_time = (time_t)0;
1413 /* set the texture size to default */
1422 glShadeModel(GL_SMOOTH);
1423 glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
1424 glEnable(GL_DEPTH_TEST);
1425 glEnable(GL_CULL_FACE);
1426 glDisable(GL_LIGHTING);
1428 /* space for textures */
1429 glGenTextures(1, &gp->textures[0].id);
1430 glGenTextures(1, &gp->textures[1].id);
1433 setup_texture(mi, &gp->textures[gp->visible]);
1436 ** want to choose a value for arg randomly if neither -arg nor -no-arg
1437 ** is specified. xscreensaver libraries don't seem to let you do this -
1438 ** if something isn't true then it is false (pesky two-state boolean values).
1439 ** so, i've defined both -arg and -no-arg to arguments and added the
1441 ** (btw if both -arg and -no-arg are defined then arg is set to False)
1443 if (zoom == False && nozoom == False)
1445 /* no zoom preference - randomise */
1446 zoom = (((random() & 0x1) == 0x1) ? True : False);
1448 else if (nozoom == True)
1450 /* definately no zoom */
1454 if (move == False && nomove == False)
1456 /* no move preference - randomise */
1457 move = (((random() & 0x1) == 0x1) ? True : False);
1459 else if (nomove == True)
1461 /* definately no move */
1465 if (rotate == False && norotate == False)
1467 /* no rotate preference - randomise */
1468 rotate = (((random() & 0x1) == 0x1) ? True : False);
1470 else if (norotate == True)
1472 /* definately no rotate */
1476 /* define cam variables */
1477 gp->cam_x_speed = MAX_CAM_SPEED * frandrange(-.5, 0.5);
1478 gp->cam_x_phase = random() % 360;
1479 gp->cam_y_speed = MAX_CAM_SPEED * frandrange(-.5, 0.5);
1480 gp->cam_y_phase = random() % 360;
1481 gp->cam_z_speed = MAX_CAM_SPEED * frandrange(-.5, 0.5);
1482 gp->cam_z_phase = random() % 360;
1484 /* initial angular speeds */
1485 gp->rangle_vel = INITIAL_ANGLE_VEL * frandrange(-.5, 0.5);
1486 gp->tangle_vel = INITIAL_ANGLE_VEL * frandrange(-.5, 0.5);
1487 gp->rangle_acc = INITIAL_ANGLE_ACC * frandrange(-.5, 0.5);
1488 gp->tangle_acc = INITIAL_ANGLE_ACC * frandrange(-.5, 0.5);
1494 gp->rangle_vel *= speed;
1495 gp->tangle_vel *= speed;
1496 gp->rangle_acc *= speed;
1497 gp->tangle_acc *= speed;
1501 /* distance is 11 - size */
1502 if (gp->size != -1) {
1504 fprintf(stderr, "-size given. ignoring -zoom.\n");
1509 } else if (gp->size >= 10) {
1512 gp->size = 11 - gp->size;
1516 printf("phases [%d, %d, %d]\n", gp->cam_x_phase, gp->cam_y_phase, gp->cam_z_phase);
1521 init_gleidescope(ModeInfo * mi)
1524 int screen = MI_SCREEN(mi);
1526 if (gleidescope == NULL) {
1527 gleidescope = (gleidestruct *) calloc(MI_NUM_SCREENS(mi), sizeof (gleidestruct));
1528 if (gleidescope == NULL) {
1532 gp = &gleidescope[screen];
1533 gp->window = MI_WINDOW(mi);
1537 if ((gp->glx_context = init_GL(mi)) != NULL) {
1539 reshape_gleidescope(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
1540 clear_gl_error(); /* WTF? sometimes "invalid op" from glViewport! */
1542 glDrawBuffer(GL_BACK);
1544 /* do initialisation */
1553 draw_gleidescope(ModeInfo * mi)
1555 gleidestruct *gp = &gleidescope[MI_SCREEN(mi)];
1556 Display *display = MI_DISPLAY(mi);
1557 Window window = MI_WINDOW(mi);
1560 if (!gp->glx_context)
1563 /* Just keep running before the texture has come in. */
1564 /* if (gp->waiting_for_image_p) return; */
1566 glDrawBuffer(GL_BACK);
1568 glXMakeCurrent(display, window, *(gp->glx_context));
1576 glXSwapBuffers(display, window);
1580 grab_frame(display, window);
1584 /* need to change texture? */
1585 if ((gp->start_time != 0) && (duration != -1) && gp->fade == 0) {
1586 if (gp->start_time + duration <= time((time_t *)0)) {
1588 printf("Start Time: %lu - Current Time: %lu\n", (unsigned long)gp->start_time, (unsigned long)time((time_t *)0));
1589 printf("Changing Texture\n");
1591 /* get new snapshot (into back buffer) and start fade count */
1592 setup_texture(mi, &gp->textures[1 - gp->visible]);
1593 /* restart fading */
1600 release_gleidescope(ModeInfo * mi)
1602 if (gleidescope != NULL) {
1605 for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
1606 gleidestruct *gp = &gleidescope[screen];
1608 /* acd - is this needed? */
1609 if (gp->glx_context) {
1610 /* Display lists MUST be freed while their glXContext is current. */
1611 glXMakeCurrent(MI_DISPLAY(mi), gp->window, *(gp->glx_context));
1613 /* acd - was code here for freeing things that are no longer in struct */
1616 (void) free((void *) gleidescope);
1623 XSCREENSAVER_MODULE ("Gleidescope", gleidescope)