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 PROGCLASS "Klein"
15 # define HACK_INIT init_klein
16 # define HACK_DRAW draw_klein
17 # define HACK_RESHAPE reshape_klein
18 # define HACK_HANDLE_EVENT klein_handle_event
19 # define EVENT_MASK PointerMotionMask
20 # define klein_opts xlockmore_opts
23 #define DEF_SPIN "True"
24 #define DEF_WANDER "False"
25 #define DEF_RANDOM "False"
26 #define DEF_SPEED "150"
28 # define DEFAULTS "*delay: 20000 \n" \
31 # include "xlockmore.h" /* from the xscreensaver distribution */
32 #else /* !STANDALONE */
33 # include "xlock.h" /* from the xlockmore distribution */
34 #endif /* !STANDALONE */
40 #include "gltrackball.h"
43 #define countof(x) (sizeof((x))/sizeof((*x)))
45 /* surfaces being drawn */
58 /* primitives to draw with
59 * note that we skip the polygons and
60 * triangle fans -- too slow
62 * also removed triangle_strip and quads --
63 * just doesn't look good enough
77 static Bool do_wander;
79 static XrmOptionDescRec opts[] = {
80 {"-speed", ".speed", XrmoptionSepArg, 0 },
81 { "-spin", ".spin", XrmoptionNoArg, "True" },
82 { "+spin", ".spin", XrmoptionNoArg, "False" },
83 { "-wander", ".wander", XrmoptionNoArg, "True" },
84 { "+wander", ".wander", XrmoptionNoArg, "False" },
85 { "-random", ".rand", XrmoptionNoArg, "True" },
86 { "+random", ".rand", XrmoptionNoArg, "False" },
89 static argtype vars[] = {
90 {&rand, "rand", "Random", DEF_RANDOM, t_Bool},
91 {&do_spin, "spin", "Spin", DEF_SPIN, t_Bool},
92 {&do_wander, "wander", "Wander", DEF_WANDER, t_Bool},
93 {&speed, "speed", "Speed", DEF_SPEED, t_Int},
97 ModeSpecOpt klein_opts = {countof(opts), opts, countof(vars), vars, NULL};
108 GLXContext *glx_context;
111 trackball_state *trackball;
122 static kleinstruct *klein = NULL;
128 kleinstruct *kp = &klein[MI_SCREEN(mi)];
129 static float step = 0.0;
133 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
135 glEnable(GL_DEPTH_TEST);
136 glEnable(GL_NORMALIZE);
137 glEnable(GL_CULL_FACE);
143 get_position (kp->rot, &x, &y, &z, !kp->button_down_p);
144 glTranslatef((x - 0.5) * 10,
148 gltrackball_rotate (kp->trackball);
150 get_rotation (kp->rot, &x, &y, &z, !kp->button_down_p);
151 glRotatef (x * 360, 1.0, 0.0, 0.0);
152 glRotatef (y * 360, 0.0, 1.0, 0.0);
153 glRotatef (z * 360, 0.0, 0.0, 1.0);
156 glScalef( 4.0, 4.0, 4.0 );
159 switch(kp->surface) {
161 for(u = -M_PI; u < M_PI; u+=kp->du){
162 for(v = -M_PI; v < M_PI; v+=kp->dv){
163 coord[0] = cos(u)*(kp->a + sin(v)*cos(u/2) -
164 sin(2*v)*sin(u/2)/2);
165 coord[1] = sin(u)*(kp->a + sin(v)*cos(u/2) -
166 sin(2*v)*sin(u/2)/2);
167 coord[2] = sin(u/2)*sin(v) + cos(u/2)*sin(2*v)/2;
168 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
174 for(u = -M_PI; u < M_PI; u+=kp->du){
175 for(v = -M_PI; v < M_PI; v+=kp->dv){
176 coord[0] = kp->a*cos(u)*sin(v);
177 coord[1] = kp->a*sin(u)*sin(v);
178 coord[2] = kp->a*(cos(v) + sin(tan((v/2))))+0.2*u;
179 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
185 for(u = -M_PI; u < M_PI; u+=kp->du){
186 for(v = -M_PI; v < M_PI; v+=kp->dv){
187 coord[0] = kp->a*(u-(u*u*u/3)+u*v*v);
188 coord[1] = kp->b*(v-(v*v*v/3)+u*u*v);
190 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
196 for(u = -M_PI; u < M_PI; u+=kp->du){
197 for(v = -M_PI; v < M_PI; v+=kp->dv){
198 coord[0] = 2*(cos(u)+u*sin(u))*sin(v)/(1+u*u*sin(v)*sin(v));
199 coord[1] = 2*(sin(u)-u*cos(u))*sin(v)/(1+u*u*sin(v)*sin(v));
200 coord[2] = sin(tan(v/2))+2*cos(v)/(1+u*u*sin(v)*sin(v));
202 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
208 for(u = -M_PI; u < M_PI; u+=kp->du){
209 for(v = -M_PI; v < M_PI; v+=kp->dv){
210 coord[0] = cos(u)+v*cos(u/2)*cos(u);
211 coord[1] = sin(u)+v*cos(u/2)*sin(u);
212 coord[2] = v*sin(u/2);
213 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
219 for(u = 0; u < 2*M_PI; u+=kp->du){
220 for(v = 0; v < 2*M_PI; v+=kp->dv){
221 coord[0] = kp->a*(1-v/(2*M_PI))*cos(2*v)*(1+cos(u))+sin(kp->c+=0.00001)*cos(2*v);
222 coord[1] = kp->a*(1-v/(2*M_PI))*sin(2*v)*(1+cos(u))+cos(kp->c+=0.00001)*sin(2*v);
223 coord[2] = sin(kp->b+=0.00001)*v/(2*M_PI)+kp->a*(1-v/(2*M_PI))*sin(u);
224 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
230 for(u = -M_PI; u < M_PI; u+=kp->du){
231 for(v = -M_PI; v < M_PI; v+=kp->dv){
232 coord[0] = u*pow(v,2) + 3*pow(v,4);
233 coord[1] = -2*u*v - 4*pow(v,3);
235 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
241 for(u = -M_PI; u < M_PI; u+=kp->du){
242 for(v = -M_PI; v < M_PI; v+=kp->dv){
243 coord[0] = kp->a*cos(u);
244 coord[1] = 1.5*cos(v) + kp->a*sin(u);
246 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
252 for(u = -M_PI; u < M_PI; u+=kp->du){
253 for(v = -M_PI; v < M_PI; v+=kp->dv){
254 coord[0] = sin(u)*kp->a;
255 coord[1] = cos(u)*kp->a;
256 coord[2] = sin(u/2)*cos(v) + cos(u/2)*sin(v);
257 glColor3f(coord[0]+0.7, coord[1]+0.7, coord[2]+0.7);
267 kp->a = sin(step+=0.01);
268 kp->b = cos(step+=0.01);
272 /* new window size or exposure */
274 reshape_klein(ModeInfo *mi, int width, int height)
276 GLfloat h = (GLfloat) height / (GLfloat) width;
278 glViewport(0, 0, (GLint) width, (GLint) height);
279 glMatrixMode(GL_PROJECTION);
281 gluPerspective (30.0, 1/h, 1.0, 100.0);
283 glMatrixMode(GL_MODELVIEW);
285 gluLookAt( 0.0, 0.0, 30.0,
289 glClear(GL_COLOR_BUFFER_BIT);
294 klein_handle_event (ModeInfo *mi, XEvent *event)
296 kleinstruct *kp = &klein[MI_SCREEN(mi)];
298 if (event->xany.type == ButtonPress && event->xbutton.button == Button1) {
299 kp->button_down_p = True;
300 gltrackball_start (kp->trackball, event->xbutton.x, event->xbutton.y, MI_WIDTH (mi), MI_HEIGHT (mi));
302 } else if (event->xany.type == ButtonRelease && event->xbutton.button == Button1) {
303 kp->button_down_p = False;
305 } else if (event->xany.type == ButtonPress &&
306 (event->xbutton.button == Button4 ||
307 event->xbutton.button == Button5)) {
308 gltrackball_mousewheel (kp->trackball, event->xbutton.button, 10,
309 !!event->xbutton.state);
311 } else if (event->xany.type == MotionNotify && kp->button_down_p) {
312 gltrackball_track (kp->trackball, event->xmotion.x, event->xmotion.y, MI_WIDTH (mi), MI_HEIGHT (mi));
321 init_klein(ModeInfo *mi)
323 int screen = MI_SCREEN(mi);
327 if ((klein = (kleinstruct *) calloc(MI_NUM_SCREENS(mi), sizeof (kleinstruct))) == NULL)
332 kp->window = MI_WINDOW(mi);
335 double spin_speed = 1.0;
336 double wander_speed = 0.03;
337 kp->rot = make_rotator (do_spin ? spin_speed : 0,
338 do_spin ? spin_speed : 0,
339 do_spin ? spin_speed : 0,
341 do_wander ? wander_speed : 0,
343 kp->trackball = gltrackball_init ();
347 render = random() % MY_PRIM_LAST;
348 kp->surface = random() % SURFACE_LAST;
350 render = MY_LINE_LOOP;
355 case MY_POINTS: kp->render = GL_POINTS; break;
356 case MY_LINES: kp->render = GL_LINES; break;
357 case MY_LINE_LOOP: kp->render = GL_LINE_LOOP; break;
359 kp->render = GL_LINE_LOOP;
361 /*kp->render=GL_TRIANGLE_FAN;*/
362 /*kp->render=GL_POLYGON;*/
370 if ((kp->glx_context = init_GL(mi)) != NULL) {
371 reshape_klein(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
378 draw_klein(ModeInfo * mi)
380 kleinstruct *kp = &klein[MI_SCREEN(mi)];
381 Display *display = MI_DISPLAY(mi);
382 Window window = MI_WINDOW(mi);
384 if (!kp->glx_context) return;
386 glDrawBuffer(GL_BACK);
388 glXMakeCurrent(display, window, *(kp->glx_context));
390 if (mi->fps_p) do_fps (mi);
392 glXSwapBuffers(display, window);
396 release_klein(ModeInfo * mi)
401 for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
402 kleinstruct *kp = &klein[screen];
404 if (kp->glx_context) {
405 /* Display lists MUST be freed while their glXContext is current. */
406 glXMakeCurrent(MI_DISPLAY(mi), kp->window, *(kp->glx_context));
409 (void) free((void *) klein);
416 /*********************************************************/