/* -*- Mode: C; tab-width: 4 -*- */
/* gears --- 3D gear wheels */
-#if !defined( lint ) && !defined( SABER )
+#if 0
static const char sccsid[] = "@(#)gears.c 4.07 97/11/24 xlockmore";
-
#endif
/*-
* been fixed in MesaGL 2.2 and later releases.
*/
-/*-
- * due to a Bug/feature in VMS X11/Intrinsic.h has to be placed before xlock.
- * otherwise caddr_t is not defined correctly
- */
-
-#include <X11/Intrinsic.h>
-
#ifdef STANDALONE
# define PROGCLASS "Gears"
# define HACK_INIT init_gears
# define HACK_DRAW draw_gears
# define HACK_RESHAPE reshape_gears
+# define HACK_HANDLE_EVENT gears_handle_event
+# define EVENT_MASK PointerMotionMask
# define gears_opts xlockmore_opts
# define DEFAULTS "*count: 1 \n" \
"*cycles: 2 \n" \
#ifdef USE_GL
+#include "rotator.h"
+#include "gltrackball.h"
+
#undef countof
#define countof(x) (sizeof((x))/sizeof((*x)))
static int planetary;
static XrmOptionDescRec opts[] = {
- {"-planetary", ".gears.planetary", XrmoptionNoArg, (caddr_t) "true" },
- {"+planetary", ".gears.planetary", XrmoptionNoArg, (caddr_t) "false" },
+ {"-planetary", ".gears.planetary", XrmoptionNoArg, "true" },
+ {"+planetary", ".gears.planetary", XrmoptionNoArg, "false" },
};
static argtype vars[] = {
- {(caddr_t *) &planetary, "planetary", "Planetary", DEF_PLANETARY, t_Bool},
+ {&planetary, "planetary", "Planetary", DEF_PLANETARY, t_Bool},
};
ModeSpecOpt gears_opts = {countof(opts), opts, countof(vars), vars, NULL};
#endif
-typedef struct {
+#define SMOOTH_TUBE /* whether to have smooth or faceted tubes */
+
+#ifdef SMOOTH_TUBE
+# define TUBE_FACES 20 /* how densely to render tubes */
+#else
+# define TUBE_FACES 6
+#endif
- 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 */
+typedef struct {
GLuint gear1, gear2, gear3;
GLuint gear_inner, gear_outer;
GLuint armature;
GLfloat angle;
GLXContext *glx_context;
Window window;
+ rotator *rot;
+ trackball_state *trackball;
+ Bool button_down_p;
} gearsstruct;
static gearsstruct *gears = NULL;
}
-
static void
-tube(GLfloat radius, GLfloat width, GLint facets, Bool wire)
+unit_tube (Bool wire)
{
- GLint i;
- GLfloat da = 2.0 * M_PI / facets / 4.0;
-
+ int i;
+ int faces = TUBE_FACES;
+ GLfloat step = M_PI * 2 / faces;
+ GLfloat th;
+ int z = 0;
+
+ /* side walls
+ */
glFrontFace(GL_CCW);
- /* draw bottom of tube */
+# ifdef SMOOTH_TUBE
+ glBegin(wire ? GL_LINES : GL_QUAD_STRIP);
+# else
+ glBegin(wire ? GL_LINES : GL_QUADS);
+# endif
- glShadeModel(GL_FLAT);
- glNormal3f(0, 0, 1);
- if (!wire)
+ for (i = 0, th = 0; i <= faces; i++)
{
- glBegin(GL_TRIANGLE_FAN);
- glVertex3f(0, 0, width * 0.5);
- for (i = 0; i <= facets; i++) {
- GLfloat angle = i * 2.0 * M_PI / facets;
- glVertex3f(radius * cos(angle), radius * sin(angle), width * 0.5);
- }
- glEnd();
+ GLfloat x = cos (th);
+ GLfloat y = sin (th);
+ glNormal3f(x, 0, y);
+ glVertex3f(x, 0.0, y);
+ glVertex3f(x, 1.0, y);
+ th += step;
+
+# ifndef SMOOTH_TUBE
+ x = cos (th);
+ y = sin (th);
+ glVertex3f(x, 1.0, y);
+ glVertex3f(x, 0.0, y);
+# endif
}
+ glEnd();
- /* draw top of tube */
-
- glShadeModel(GL_FLAT);
- glNormal3f(0, 0, -1);
- glFrontFace(GL_CW);
- if (!wire)
+ /* End caps
+ */
+ for (z = 0; z <= 1; z++)
{
- glBegin(GL_TRIANGLE_FAN);
- glVertex3f(0, 0, -width * 0.5);
- for (i = 0; i <= facets; i++) {
- GLfloat angle = i * 2.0 * M_PI / facets;
- glVertex3f(radius * cos(angle), radius * sin(angle), -width * 0.5);
- }
+ glFrontFace(z == 0 ? GL_CCW : GL_CW);
+ glNormal3f(0, (z == 0 ? -1 : 1), 0);
+ glBegin(wire ? GL_LINE_LOOP : GL_TRIANGLE_FAN);
+ if (! wire) glVertex3f(0, z, 0);
+ for (i = 0, th = 0; i <= faces; i++)
+ {
+ GLfloat x = cos (th);
+ GLfloat y = sin (th);
+ glVertex3f(x, z, y);
+ th += step;
+ }
glEnd();
}
+}
- /* draw side of tube */
- glFrontFace(GL_CW);
- glShadeModel(GL_SMOOTH);
- if (!wire)
- glBegin(GL_QUAD_STRIP);
+static void
+tube (GLfloat x1, GLfloat y1, GLfloat z1,
+ GLfloat x2, GLfloat y2, GLfloat z2,
+ GLfloat diameter, GLfloat cap_size,
+ Bool wire)
+{
+ GLfloat length, angle, a, b, c;
- for (i = 0; i <= facets; i++) {
- GLfloat angle = i * 2.0 * M_PI / facets;
-
- if (wire)
- glBegin(GL_LINES);
+ if (diameter <= 0) abort();
- glNormal3f(cos(angle), sin(angle), 0.0);
+ a = (x2 - x1);
+ b = (y2 - y1);
+ c = (z2 - z1);
- glVertex3f(radius * cos(angle), radius * sin(angle), -width * 0.5);
- glVertex3f(radius * cos(angle), radius * sin(angle), width * 0.5);
+ length = sqrt (a*a + b*b + c*c);
+ angle = acos (a / length);
- if (wire) {
- glVertex3f(radius * cos(angle), radius * sin(angle), -width * 0.5);
- glVertex3f(radius * cos(angle + 4 * da), radius * sin(angle + 4 * da), -width * 0.5);
- glVertex3f(radius * cos(angle), radius * sin(angle), width * 0.5);
- glVertex3f(radius * cos(angle + 4 * da), radius * sin(angle + 4 * da), width * 0.5);
- glEnd();
- }
- }
+ glPushMatrix();
+ glTranslatef(x1, y1, z1);
+ glScalef (length, length, length);
- if (!wire)
- glEnd();
+ if (c == 0 && b == 0)
+ glRotatef (angle / (M_PI / 180), 0, 1, 0);
+ else
+ glRotatef (angle / (M_PI / 180), 0, -c, b);
- glFrontFace(GL_CCW);
+ glRotatef (-90, 0, 0, 1);
+ glScalef (diameter/length, 1, diameter/length);
+
+ /* extend the endpoints of the tube by the cap size in both directions */
+ if (cap_size != 0)
+ {
+ GLfloat c = cap_size/length;
+ glTranslatef (0, -c, 0);
+ glScalef (1, 1+c+c, 1);
+ }
+
+ unit_tube (wire);
+ glPopMatrix();
}
+static void
+ctube (GLfloat diameter, GLfloat width, Bool wire)
+{
+ tube (0, 0, width/2,
+ 0, 0, -width/2,
+ diameter, 0, wire);
+}
+
static void
arm(GLfloat length,
GLfloat width1, GLfloat height1,
glPushMatrix();
+ gltrackball_rotate (gp->trackball);
+
{
- GLfloat x = gp->rotx;
- GLfloat y = gp->roty;
- GLfloat z = gp->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);
+ double x, y, z;
+ get_rotation (gp->rot, &x, &y, &z, !gp->button_down_p);
+ 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);
}
if (!planetary) {
glPushMatrix();
glTranslatef(7.0, 0, 0);
glRotatef(90, 0, 1, 0);
- tube(0.5, 0.5, 10, wire); /* nub 1 */
+
+ ctube(0.5, 0.5, wire); /* nub 1 */
glPopMatrix();
glPushMatrix();
glRotatef(120, 0, 0, 1);
glTranslatef(7.0, 0, 0);
glRotatef(90, 0, 1, 0);
- tube(0.5, 0.5, 10, wire); /* nub 2 */
+ ctube(0.5, 0.5, wire); /* nub 2 */
glPopMatrix();
glPushMatrix();
glRotatef(240, 0, 0, 1);
glTranslatef(7.0, 0, 0);
glRotatef(90, 0, 1, 0);
- tube(0.5, 0.5, 10, wire); /* nub 3 */
+ ctube(0.5, 0.5, wire); /* nub 3 */
glPopMatrix();
}
glTranslatef(0, 0, 1.5);
-
- tube(0.5, 10, 15, wire); /* center axle */
+ ctube(0.5, 10, wire); /* center axle */
glPushMatrix();
glTranslatef(0.0, 4.2, -1);
- tube(0.5, 3, 15, wire); /* axle 1 */
+ ctube(0.5, 3, wire); /* axle 1 */
glTranslatef(0, 0, 1.8);
- tube(0.7, 0.7, 15, wire);
+ ctube(0.7, 0.7, wire);
glPopMatrix();
glPushMatrix();
glRotatef(120, 0.0, 0.0, 1.0);
glTranslatef(0.0, 4.2, -1);
- tube(0.5, 3, 15, wire); /* axle 2 */
+ ctube(0.5, 3, wire); /* axle 2 */
glTranslatef(0, 0, 1.8);
- tube(0.7, 0.7, 15, wire);
+ ctube(0.7, 0.7, wire);
glPopMatrix();
glPushMatrix();
glRotatef(240, 0.0, 0.0, 1.0);
glTranslatef(0.0, 4.2, -1);
- tube(0.5, 3, 15, wire); /* axle 3 */
+ ctube(0.5, 3, wire); /* axle 3 */
glTranslatef(0, 0, 1.8);
- tube(0.7, 0.7, 15, wire);
+ ctube(0.7, 0.7, wire);
glPopMatrix();
glTranslatef(0, 0, 1.5); /* center disk */
- tube(1.5, 2, 20, wire);
+ ctube(1.5, 2, wire);
glPushMatrix();
glRotatef(270, 0, 0, 1);
}
-/* 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)
+Bool
+gears_handle_event (ModeInfo *mi, XEvent *event)
{
- double ppos = *pos;
+ gearsstruct *gp = &gears[MI_SCREEN(mi)];
- /* 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)
+ if (event->xany.type == ButtonPress &&
+ event->xbutton.button & Button1)
{
- *dv = -*dv;
+ gp->button_down_p = True;
+ gltrackball_start (gp->trackball,
+ event->xbutton.x, event->xbutton.y,
+ MI_WIDTH (mi), MI_HEIGHT (mi));
+ return True;
}
- /* If it stops, start it going in the other direction. */
- else if (*v < 0)
+ else if (event->xany.type == ButtonRelease &&
+ event->xbutton.button & Button1)
{
- 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;
- }
+ gp->button_down_p = False;
+ return True;
}
-
- /* Alter direction of rotational acceleration randomly. */
- if (! (random() % 120))
- *dv = -*dv;
-
- /* Change acceleration very occasionally. */
- if (! (random() % 200))
+ else if (event->xany.type == MotionNotify &&
+ gp->button_down_p)
{
- if (*dv == 0)
- *dv = 0.00001;
- else if (random() & 1)
- *dv *= 1.2;
- else
- *dv *= 0.8;
+ gltrackball_track (gp->trackball,
+ event->xmotion.x, event->xmotion.y,
+ MI_WIDTH (mi), MI_HEIGHT (mi));
+ return True;
}
+
+ return False;
}
gp->window = MI_WINDOW(mi);
- gp->rotx = frand(1.0) * RANDSIGN();
- gp->roty = frand(1.0) * RANDSIGN();
- gp->rotz = frand(1.0) * RANDSIGN();
-
- /* bell curve from 0-1.5 degrees, avg 0.75 */
- gp->dx = (frand(1) + frand(1) + frand(1)) / (360*2);
- gp->dy = (frand(1) + frand(1) + frand(1)) / (360*2);
- gp->dz = (frand(1) + frand(1) + frand(1)) / (360*2);
-
- gp->d_max = gp->dx * 2;
-
- gp->ddx = 0.00006 + frand(0.00003);
- gp->ddy = 0.00006 + frand(0.00003);
- gp->ddz = 0.00006 + frand(0.00003);
-
- gp->ddx = 0.00001;
- gp->ddy = 0.00001;
- gp->ddz = 0.00001;
+ gp->rot = make_rotator (1, 1, 1, 1, 0, True);
+ gp->trackball = gltrackball_init ();
if ((gp->glx_context = init_GL(mi)) != NULL) {
reshape_gears(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
/* let's do something so we don't get bored */
gp->angle = (int) (gp->angle + angle_incr) % 360;
- rotate(&gp->rotx, &gp->dx, &gp->ddx, gp->d_max);
- rotate(&gp->roty, &gp->dy, &gp->ddy, gp->d_max);
- rotate(&gp->rotz, &gp->dz, &gp->ddz, gp->d_max);
-
if (mi->fps_p) do_fps (mi);
glFinish();
glXSwapBuffers(display, window);
projects / xscreensaver / blobdiff