}
+static void
+reset_mgears (ModeInfo *mi)
+{
+ mgears_configuration *bp = &bps[MI_SCREEN(mi)];
+ int wire = MI_IS_WIREFRAME(mi);
+ int total_gears = MI_COUNT(mi);
+ double gears_per_turn;
+ double gear_r, tw, th, thick, slope;
+ int i, nubs, size;
+
+ if (! (total_gears & 1))
+ total_gears++; /* must be odd or gears intersect */
+
+ /* Number of teeth must be odd if number of gears is odd, or teeth don't
+ mesh when the loop closes. And since number of gears must be odd...
+ */
+ if (! (teeth_arg & 1)) teeth_arg++;
+ if (teeth_arg < 7) teeth_arg = 7;
+
+ if (total_gears < 13) /* gear mesh angle is too steep with less */
+ total_gears = 13;
+
+ thick = 0.2;
+ nubs = (random() & 3) ? 0 : (random() % teeth_arg) / 2;
+
+ slope = 0;
+
+ /* Sloping gears are incompatible with "-roll" ... */
+ /* slope= -M_PI * 2 / total_gears; */
+
+ gears_per_turn = total_gears / 2.0;
+
+ bp->ring_r = 3;
+ gear_r = M_PI * bp->ring_r / gears_per_turn;
+ tw = 0;
+ th = gear_r * 2.5 / teeth_arg;
+
+ /* If the gears are small, use a lower density mesh. */
+ size = (gear_r > 0.60 ? INVOLUTE_HUGE :
+ gear_r > 0.32 ? INVOLUTE_LARGE :
+ gear_r > 0.13 ? INVOLUTE_MEDIUM :
+ INVOLUTE_SMALL);
+
+ /* If there are lots of teeth, use a lower density mesh. */
+ if (teeth_arg > 77)
+ size = INVOLUTE_SMALL;
+ if (teeth_arg > 45 && size >= INVOLUTE_HUGE)
+ size = INVOLUTE_MEDIUM;
+
+ if (bp->gears)
+ {
+ for (i = 0; i < bp->ngears; i++)
+ glDeleteLists (bp->gears[i].g.dlist, 1);
+ free (bp->gears);
+ bp->gears = 0;
+ }
+
+ bp->ngears = total_gears;
+
+ bp->gears = (mogear *) calloc (bp->ngears, sizeof(*bp->gears));
+ for (i = 0; i < bp->ngears; i++)
+ {
+ mogear *mg = &bp->gears[i];
+ gear *g = &mg->g;
+
+ g->r = gear_r;
+ g->size = size;
+ g->nteeth = teeth_arg;
+ g->tooth_w = tw;
+ g->tooth_h = th;
+ g->tooth_slope = slope;
+ g->thickness = g->r * thick;
+ g->thickness2 = g->thickness * 0.1;
+ g->thickness3 = g->thickness;
+ g->inner_r = g->r * 0.80;
+ g->inner_r2 = g->r * 0.60;
+ g->inner_r3 = g->r * 0.55;
+ g->nubs = nubs;
+ mg->pos_th = (M_PI * 2 / gears_per_turn) * i;
+ mg->pos_thz = (M_PI / 2 / gears_per_turn) * i;
+
+ g->th = ((i & 1)
+ ? (M_PI * 2 / g->nteeth)
+ : 0);
+
+ /* Colorize
+ */
+ g->color[0] = 0.7 + frand(0.3);
+ g->color[1] = 0.7 + frand(0.3);
+ g->color[2] = 0.7 + frand(0.3);
+ g->color[3] = 1.0;
+
+ g->color2[0] = g->color[0] * 0.85;
+ g->color2[1] = g->color[1] * 0.85;
+ g->color2[2] = g->color[2] * 0.85;
+ g->color2[3] = g->color[3];
+
+ /* Now render the gear into its display list.
+ */
+ g->dlist = glGenLists (1);
+ if (! g->dlist)
+ {
+ check_gl_error ("glGenLists");
+ abort();
+ }
+
+ glNewList (g->dlist, GL_COMPILE);
+ g->polygons += draw_involute_gear (g, wire);
+ glEndList ();
+ }
+}
+
+
ENTRYPOINT void
init_mgears (ModeInfo *mi)
{
mgears_configuration *bp;
int wire = MI_IS_WIREFRAME(mi);
- int i;
if (!bps) {
bps = (mgears_configuration *)
glLightfv(GL_LIGHT0, GL_SPECULAR, spc);
}
- if (! bp->rot)
{
double spin_speed = 0.5;
double wander_speed = 0.01;
bp->trackball = gltrackball_init (True);
}
- {
- int total_gears = MI_COUNT(mi);
- double gears_per_turn;
- double gear_r, tw, th, thick, slope;
- int nubs, size;
-
- if (! (total_gears & 1))
- total_gears++; /* must be odd or gears intersect */
-
- /* Number of teeth must be odd if number of gears is odd, or teeth don't
- mesh when the loop closes. And since number of gears must be odd...
- */
- if (! (teeth_arg & 1)) teeth_arg++;
- if (teeth_arg < 7) teeth_arg = 7;
-
- if (total_gears < 13) /* gear mesh angle is too steep with less */
- total_gears = 13;
-
- thick = 0.2;
- nubs = (random() & 3) ? 0 : (random() % teeth_arg) / 2;
-
- slope = 0;
-
- /* Sloping gears are incompatible with "-roll" ... */
- /* slope= -M_PI * 2 / total_gears; */
-
- gears_per_turn = total_gears / 2.0;
-
- bp->ring_r = 3;
- gear_r = M_PI * bp->ring_r / gears_per_turn;
- tw = 0;
- th = gear_r * 2.5 / teeth_arg;
-
- /* If the gears are small, use a lower density mesh. */
- size = (gear_r > 0.32 ? INVOLUTE_LARGE :
- gear_r > 0.13 ? INVOLUTE_MEDIUM :
- INVOLUTE_SMALL);
-
- /* If there are lots of teeth, use a lower density mesh. */
- if (teeth_arg > 77)
- size = INVOLUTE_SMALL;
- if (teeth_arg > 45 && size == INVOLUTE_LARGE)
- size = INVOLUTE_MEDIUM;
-
- if (bp->gears)
- {
- for (i = 0; i < bp->ngears; i++)
- glDeleteLists (bp->gears[i].g.dlist, 1);
- free (bp->gears);
- }
-
- bp->ngears = total_gears;
-
- bp->gears = (mogear *) calloc (bp->ngears, sizeof(*bp->gears));
- for (i = 0; i < bp->ngears; i++)
- {
- mogear *mg = &bp->gears[i];
- gear *g = &mg->g;
-
- g->r = gear_r;
- g->size = size;
- g->nteeth = teeth_arg;
- g->tooth_w = tw;
- g->tooth_h = th;
- g->tooth_slope = slope;
- g->thickness = g->r * thick;
- g->thickness2 = g->thickness * 0.1;
- g->thickness3 = g->thickness;
- g->inner_r = g->r * 0.80;
- g->inner_r2 = g->r * 0.60;
- g->inner_r3 = g->r * 0.55;
- g->nubs = nubs;
- mg->pos_th = (M_PI * 2 / gears_per_turn) * i;
- mg->pos_thz = (M_PI / 2 / gears_per_turn) * i;
-
- g->th = ((i & 1)
- ? (M_PI * 2 / g->nteeth)
- : 0);
-
- /* Colorize
- */
- g->color[0] = 0.7 + frand(0.3);
- g->color[1] = 0.7 + frand(0.3);
- g->color[2] = 0.7 + frand(0.3);
- g->color[3] = 1.0;
-
- g->color2[0] = g->color[0] * 0.85;
- g->color2[1] = g->color[1] * 0.85;
- g->color2[2] = g->color[2] * 0.85;
- g->color2[3] = g->color[3];
-
- /* Now render the gear into its display list.
- */
- g->dlist = glGenLists (1);
- if (! g->dlist)
- {
- check_gl_error ("glGenLists");
- abort();
- }
-
- glNewList (g->dlist, GL_COMPILE);
- g->polygons += draw_involute_gear (g, wire);
- glEndList ();
- }
- }
+ reset_mgears (mi);
}
keysym == XK_Up || keysym == XK_Right || keysym == XK_Next)
{
MI_COUNT(mi) += 2;
- init_mgears (mi);
+ reset_mgears (mi);
return True;
}
else if (c == '-' || c == '_' ||
if (MI_COUNT(mi) <= 13)
return False;
MI_COUNT(mi) -= 2;
- init_mgears (mi);
+ reset_mgears (mi);
return True;
}
else if (screenhack_event_helper (MI_DISPLAY(mi), MI_WINDOW(mi), event))
{
DEF:
MI_COUNT(mi) = 13 + (2 * (random() % 10));
- init_mgears (mi);
+ reset_mgears (mi);
return True;
}
projects / xscreensaver / blobdiff