1 /* -*- Mode: C; tab-width: 4 -*- */
2 /* Klein --- Klein Bottle, Moebius and other parametric surfaces
7 * 2000: written by Andrey Mirtchovski <mirtchov@cpsc.ucalgary.ca
9 * 01-Mar-2003 mirtchov modified as a xscreensaver hack
14 # define DEFAULTS "*delay: 20000 \n" \
17 # define refresh_klein 0
18 # include "xlockmore.h" /* from the xscreensaver distribution */
19 #else /* !STANDALONE */
20 # include "xlock.h" /* from the xlockmore distribution */
21 #endif /* !STANDALONE */
25 #define DEF_SPIN "True"
26 #define DEF_WANDER "False"
27 #define DEF_RANDOM "True"
28 #define DEF_SPEED "150"
31 #include "gltrackball.h"
34 #define countof(x) (sizeof((x))/sizeof((*x)))
36 /* surfaces being drawn */
49 /* primitives to draw with
50 * note that we skip the polygons and
51 * triangle fans -- too slow
53 * also removed triangle_strip and quads --
54 * just doesn't look good enough
68 static Bool do_wander;
70 static XrmOptionDescRec opts[] = {
71 {"-speed", ".speed", XrmoptionSepArg, 0 },
72 { "-spin", ".spin", XrmoptionNoArg, "True" },
73 { "+spin", ".spin", XrmoptionNoArg, "False" },
74 { "-wander", ".wander", XrmoptionNoArg, "True" },
75 { "+wander", ".wander", XrmoptionNoArg, "False" },
76 { "-random", ".rand", XrmoptionNoArg, "True" },
77 { "+random", ".rand", XrmoptionNoArg, "False" },
80 static argtype vars[] = {
81 {&rand, "rand", "Random", DEF_RANDOM, t_Bool},
82 {&do_spin, "spin", "Spin", DEF_SPIN, t_Bool},
83 {&do_wander, "wander", "Wander", DEF_WANDER, t_Bool},
84 {&speed, "speed", "Speed", DEF_SPEED, t_Int},
88 ENTRYPOINT ModeSpecOpt klein_opts = {countof(opts), opts, countof(vars), vars, NULL};
99 GLXContext *glx_context;
102 trackball_state *trackball;
115 static kleinstruct *klein = NULL;
121 kleinstruct *kp = &klein[MI_SCREEN(mi)];
125 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
127 glEnable(GL_DEPTH_TEST);
128 glEnable(GL_NORMALIZE);
129 glEnable(GL_CULL_FACE);
135 get_position (kp->rot, &x, &y, &z, !kp->button_down_p);
136 glTranslatef((x - 0.5) * 10,
140 gltrackball_rotate (kp->trackball);
142 get_rotation (kp->rot, &x, &y, &z, !kp->button_down_p);
143 glRotatef (x * 360, 1.0, 0.0, 0.0);
144 glRotatef (y * 360, 0.0, 1.0, 0.0);
145 glRotatef (z * 360, 0.0, 0.0, 1.0);
148 glScalef( 4.0, 4.0, 4.0 );
151 switch(kp->surface) {
153 for(u = -M_PI; u < M_PI; u+=kp->du){
154 for(v = -M_PI; v < M_PI; v+=kp->dv){
155 coord[0] = cos(u)*(kp->a + sin(v)*cos(u/2) -
156 sin(2*v)*sin(u/2)/2);
157 coord[1] = sin(u)*(kp->a + sin(v)*cos(u/2) -
158 sin(2*v)*sin(u/2)/2);
159 coord[2] = sin(u/2)*sin(v) + cos(u/2)*sin(2*v)/2;
160 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
166 for(u = -M_PI; u < M_PI; u+=kp->du){
167 for(v = -M_PI; v < M_PI; v+=kp->dv){
168 coord[0] = kp->a*cos(u)*sin(v);
169 coord[1] = kp->a*sin(u)*sin(v);
170 coord[2] = kp->a*(cos(v) + sin(tan((v/2))))+0.2*u;
171 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
177 for(u = -M_PI; u < M_PI; u+=kp->du){
178 for(v = -M_PI; v < M_PI; v+=kp->dv){
179 coord[0] = kp->a*(u-(u*u*u/3)+u*v*v);
180 coord[1] = kp->b*(v-(v*v*v/3)+u*u*v);
182 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
188 for(u = -M_PI; u < M_PI; u+=kp->du){
189 for(v = -M_PI; v < M_PI; v+=kp->dv){
190 coord[0] = 2*(cos(u)+u*sin(u))*sin(v)/(1+u*u*sin(v)*sin(v));
191 coord[1] = 2*(sin(u)-u*cos(u))*sin(v)/(1+u*u*sin(v)*sin(v));
192 coord[2] = sin(tan(v/2))+2*cos(v)/(1+u*u*sin(v)*sin(v));
194 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
200 for(u = -M_PI; u < M_PI; u+=kp->du){
201 for(v = -M_PI; v < M_PI; v+=kp->dv){
202 coord[0] = cos(u)+v*cos(u/2)*cos(u);
203 coord[1] = sin(u)+v*cos(u/2)*sin(u);
204 coord[2] = v*sin(u/2);
205 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
211 for(u = 0; u < 2*M_PI; u+=kp->du){
212 for(v = 0; v < 2*M_PI; v+=kp->dv){
213 coord[0] = kp->a*(1-v/(2*M_PI))*cos(2*v)*(1+cos(u))+sin(kp->c+=0.00001)*cos(2*v);
214 coord[1] = kp->a*(1-v/(2*M_PI))*sin(2*v)*(1+cos(u))+cos(kp->c+=0.00001)*sin(2*v);
215 coord[2] = sin(kp->b+=0.00001)*v/(2*M_PI)+kp->a*(1-v/(2*M_PI))*sin(u);
216 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
222 for(u = -M_PI; u < M_PI; u+=kp->du){
223 for(v = -M_PI; v < M_PI; v+=kp->dv){
224 coord[0] = u*pow(v,2) + 3*pow(v,4);
225 coord[1] = -2*u*v - 4*pow(v,3);
227 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
233 for(u = -M_PI; u < M_PI; u+=kp->du){
234 for(v = -M_PI; v < M_PI; v+=kp->dv){
235 coord[0] = kp->a*cos(u);
236 coord[1] = 1.5*cos(v) + kp->a*sin(u);
238 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
244 for(u = -M_PI; u < M_PI; u+=kp->du){
245 for(v = -M_PI; v < M_PI; v+=kp->dv){
246 coord[0] = sin(u)*kp->a;
247 coord[1] = cos(u)*kp->a;
248 coord[2] = sin(u/2)*cos(v) + cos(u/2)*sin(v);
249 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
259 kp->a = sin(kp->draw_step+=0.01);
260 kp->b = cos(kp->draw_step+=0.01);
264 /* new window size or exposure */
266 reshape_klein(ModeInfo *mi, int width, int height)
268 GLfloat h = (GLfloat) height / (GLfloat) width;
270 glViewport(0, 0, (GLint) width, (GLint) height);
271 glMatrixMode(GL_PROJECTION);
273 gluPerspective (30.0, 1/h, 1.0, 100.0);
275 glMatrixMode(GL_MODELVIEW);
277 gluLookAt( 0.0, 0.0, 30.0,
281 glClear(GL_COLOR_BUFFER_BIT);
286 klein_handle_event (ModeInfo *mi, XEvent *event)
288 kleinstruct *kp = &klein[MI_SCREEN(mi)];
290 if (event->xany.type == ButtonPress && event->xbutton.button == Button1) {
291 kp->button_down_p = True;
292 gltrackball_start (kp->trackball, event->xbutton.x, event->xbutton.y, MI_WIDTH (mi), MI_HEIGHT (mi));
294 } else if (event->xany.type == ButtonRelease && event->xbutton.button == Button1) {
295 kp->button_down_p = False;
297 } else if (event->xany.type == ButtonPress &&
298 (event->xbutton.button == Button4 ||
299 event->xbutton.button == Button5 ||
300 event->xbutton.button == Button6 ||
301 event->xbutton.button == Button7)) {
302 gltrackball_mousewheel (kp->trackball, event->xbutton.button, 10,
303 !!event->xbutton.state);
305 } else if (event->xany.type == MotionNotify && kp->button_down_p) {
306 gltrackball_track (kp->trackball, event->xmotion.x, event->xmotion.y, MI_WIDTH (mi), MI_HEIGHT (mi));
315 init_klein(ModeInfo *mi)
317 int screen = MI_SCREEN(mi);
321 if ((klein = (kleinstruct *) calloc(MI_NUM_SCREENS(mi), sizeof (kleinstruct))) == NULL)
326 kp->window = MI_WINDOW(mi);
329 double spin_speed = 1.0;
330 double wander_speed = 0.03;
331 kp->rot = make_rotator (do_spin ? spin_speed : 0,
332 do_spin ? spin_speed : 0,
333 do_spin ? spin_speed : 0,
335 do_wander ? wander_speed : 0,
337 kp->trackball = gltrackball_init ();
341 render = random() % MY_PRIM_LAST;
342 kp->surface = random() % SURFACE_LAST;
344 render = MY_LINE_LOOP;
349 case MY_POINTS: kp->render = GL_POINTS; break;
350 case MY_LINES: kp->render = GL_LINES; break;
351 case MY_LINE_LOOP: kp->render = GL_LINE_LOOP; break;
353 kp->render = GL_LINE_LOOP;
355 /*kp->render=GL_TRIANGLE_FAN;*/
356 /*kp->render=GL_POLYGON;*/
364 if ((kp->glx_context = init_GL(mi)) != NULL) {
365 reshape_klein(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
372 draw_klein(ModeInfo * mi)
374 kleinstruct *kp = &klein[MI_SCREEN(mi)];
375 Display *display = MI_DISPLAY(mi);
376 Window window = MI_WINDOW(mi);
378 if (!kp->glx_context) return;
380 glDrawBuffer(GL_BACK);
382 glXMakeCurrent(display, window, *(kp->glx_context));
384 if (mi->fps_p) do_fps (mi);
386 glXSwapBuffers(display, window);
390 release_klein(ModeInfo * mi)
395 for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
396 kleinstruct *kp = &klein[screen];
398 if (kp->glx_context) {
399 /* Display lists MUST be freed while their glXContext is current. */
400 glXMakeCurrent(MI_DISPLAY(mi), kp->window, *(kp->glx_context));
403 (void) free((void *) klein);
410 XSCREENSAVER_MODULE ("Klein", klein)
412 /*********************************************************/