#endif
+#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
+
+
typedef struct {
GLfloat rotx, roty, rotz; /* current object rotation */
}
-
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();
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);
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;
-
if ((gp->glx_context = init_GL(mi)) != NULL) {
reshape_gears(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
pinit(mi);
projects / xscreensaver / blobdiff