* Since I'm not a native English speaker, my apologies for any grammatical
* mistake.
*
- * My e-mail addresses are
- * vianna@cat.cbpf.br
- * and
+ * My e-mail address is
* m-vianna@usa.net
*
* Marcelo F. Vianna (Jun-01-1997)
# define PROGCLASS "Moebius"
# define HACK_INIT init_moebius
# define HACK_DRAW draw_moebius
-# define moebius_opts xlockmore_opts
+# define HACK_RESHAPE reshape_moebius
+# define moebius_opts xlockmore_opts
# define DEFAULTS "*cycles: 1 \n" \
- "*delay: 1000 \n" \
+ "*delay: 20000 \n" \
+ "*showFPS: False \n" \
"*wireframe: False \n"
# include "xlockmore.h" /* from the xscreensaver distribution */
#else /* !STANDALONE */
static XrmOptionDescRec opts[] =
{
- {"-solidmoebius", ".moebius.solidmoebius", XrmoptionNoArg, (caddr_t) "on"},
- {"+solidmoebius", ".moebius.solidmoebius", XrmoptionNoArg, (caddr_t) "off"},
+ {"-solidmoebius", ".moebius.solidmoebius", XrmoptionNoArg, (caddr_t) "on"},
+ {"+solidmoebius", ".moebius.solidmoebius", XrmoptionNoArg, (caddr_t) "off"},
{"-noants", ".moebius.noants", XrmoptionNoArg, (caddr_t) "on"},
{"+noants", ".moebius.noants", XrmoptionNoArg, (caddr_t) "off"}
};
};
ModeSpecOpt moebius_opts =
-{4, opts, 2, vars, desc};
+{sizeof opts / sizeof opts[0], opts, sizeof vars / sizeof vars[0], vars, desc};
#ifdef USE_MODULES
ModStruct moebius_description =
{"moebius", "init_moebius", "draw_moebius", "release_moebius",
"draw_moebius", "change_moebius", NULL, &moebius_opts,
- 1000, 1, 1, 1, 1.0, "",
+ 1000, 1, 1, 1, 4, 1.0, "",
"Shows Moebius Strip II, an Escher-like GL scene with ants", 0, NULL};
#endif
GLfloat ant_position;
int AreObjectsDefined[2];
GLXContext *glx_context;
+
+ GLfloat rotx, roty, rotz; /* current object rotation */
+ GLfloat dx, dy, dz; /* current rotational velocity */
+ GLfloat ddx, ddy, ddz; /* current rotational acceleration */
+ GLfloat d_max; /* max velocity */
+
} moebiusstruct;
static float front_shininess[] =
GLfloat cPhi, sPhi;
moebiusstruct *mp = &moebius[MI_SCREEN(mi)];
int i, j;
- int mono = MI_WIN_IS_MONO(mi);
+ int mono = MI_IS_MONO(mi);
float Cx, Cy, Cz;
#undef MoebiusDivisions
#undef MoebiusTransversals
-static void
-reshape(ModeInfo * mi, int width, int height)
+void
+reshape_moebius(ModeInfo * mi, int width, int height)
{
moebiusstruct *mp = &moebius[MI_SCREEN(mi)];
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_specular);
}
+
+
+/* lifted from lament.c */
+#define RAND(n) ((long) ((random() & 0x7fffffff) % ((long) (n))))
+#define RANDSIGN() ((random() & 1) ? 1 : -1)
+
+static void
+rotate(GLfloat *pos, GLfloat *v, GLfloat *dv, GLfloat max_v)
+{
+ double ppos = *pos;
+
+ /* tick position */
+ if (ppos < 0)
+ ppos = -(ppos + *v);
+ else
+ ppos += *v;
+
+ if (ppos > 1.0)
+ ppos -= 1.0;
+ else if (ppos < 0)
+ ppos += 1.0;
+
+ if (ppos < 0) abort();
+ if (ppos > 1.0) abort();
+ *pos = (*pos > 0 ? ppos : -ppos);
+
+ /* accelerate */
+ *v += *dv;
+
+ /* clamp velocity */
+ if (*v > max_v || *v < -max_v)
+ {
+ *dv = -*dv;
+ }
+ /* If it stops, start it going in the other direction. */
+ else if (*v < 0)
+ {
+ if (random() % 4)
+ {
+ *v = 0;
+
+ /* keep going in the same direction */
+ if (random() % 2)
+ *dv = 0;
+ else if (*dv < 0)
+ *dv = -*dv;
+ }
+ else
+ {
+ /* reverse gears */
+ *v = -*v;
+ *dv = -*dv;
+ *pos = -*pos;
+ }
+ }
+
+ /* Alter direction of rotational acceleration randomly. */
+ if (! (random() % 120))
+ *dv = -*dv;
+
+ /* Change acceleration very occasionally. */
+ if (! (random() % 200))
+ {
+ if (*dv == 0)
+ *dv = 0.00001;
+ else if (random() & 1)
+ *dv *= 1.2;
+ else
+ *dv *= 0.8;
+ }
+}
+
+
void
init_moebius(ModeInfo * mi)
{
if (moebius == NULL) {
if ((moebius = (moebiusstruct *) calloc(MI_NUM_SCREENS(mi),
- sizeof (moebiusstruct))) == NULL)
+ sizeof (moebiusstruct))) == NULL)
return;
}
mp = &moebius[screen];
mp->step = NRAND(90);
mp->ant_position = NRAND(90);
+ mp->rotx = frand(1.0) * RANDSIGN();
+ mp->roty = frand(1.0) * RANDSIGN();
+ mp->rotz = frand(1.0) * RANDSIGN();
+
+ /* bell curve from 0-1.5 degrees, avg 0.75 */
+ mp->dx = (frand(1) + frand(1) + frand(1)) / (360*2);
+ mp->dy = (frand(1) + frand(1) + frand(1)) / (360*2);
+ mp->dz = (frand(1) + frand(1) + frand(1)) / (360*2);
+
+ mp->d_max = mp->dx * 2;
+
+ mp->ddx = 0.00006 + frand(0.00003);
+ mp->ddy = 0.00006 + frand(0.00003);
+ mp->ddz = 0.00006 + frand(0.00003);
+
if ((mp->glx_context = init_GL(mi)) != NULL) {
- reshape(mi, MI_WIN_WIDTH(mi), MI_WIN_HEIGHT(mi));
+ reshape_moebius(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
glDrawBuffer(GL_BACK);
if (!glIsList(objects))
objects = glGenLists(3);
pinit();
} else {
- MI_CLEARWINDOW(mi);
+ MI_CLEARWINDOW(mi);
}
}
glTranslatef(0.0, 0.0, -10.0);
- if (!MI_WIN_IS_ICONIC(mi)) {
+ if (!MI_IS_ICONIC(mi)) {
glScalef(Scale4Window * mp->WindH / mp->WindW, Scale4Window, Scale4Window);
} else {
glScalef(Scale4Iconic * mp->WindH / mp->WindW, Scale4Iconic, Scale4Iconic);
}
- /* moebius */
- glRotatef(mp->step * 100, 1, 0, 0);
- glRotatef(mp->step * 95, 0, 1, 0);
- glRotatef(mp->step * 90, 0, 0, 1);
+ {
+ GLfloat x = mp->rotx;
+ GLfloat y = mp->roty;
+ GLfloat z = mp->rotz;
+ if (x < 0) x = 1 - (x + 1);
+ if (y < 0) y = 1 - (y + 1);
+ if (z < 0) z = 1 - (z + 1);
+ glRotatef(x * 360, 1.0, 0.0, 0.0);
+ glRotatef(y * 360, 0.0, 1.0, 0.0);
+ glRotatef(z * 360, 0.0, 0.0, 1.0);
+ }
+
+ /* moebius */
draw_moebius_strip(mi);
glPopMatrix();
+ rotate(&mp->rotx, &mp->dx, &mp->ddx, mp->d_max);
+ rotate(&mp->roty, &mp->dy, &mp->ddy, mp->d_max);
+ rotate(&mp->rotz, &mp->dz, &mp->ddz, mp->d_max);
+
+ if (mi->fps_p) do_fps (mi);
glFlush();
glXSwapBuffers(display, window);
projects / xscreensaver / blobdiff