func lamp(n uint) {
//
if !lightInitialized[n] {
return
}
xx, yy, zz := lightSource[n].Coord3()
x, y, z := C.GLdouble(xx), C.GLdouble(yy), C.GLdouble(zz)
r := C.GLdouble(0.1)
C.glBegin(TRIANGLE_FAN)
C.glColor3ub(C.GLubyte(lightColour[n].R), C.GLubyte(lightColour[n].G), C.GLubyte(lightColour[n].B))
C.glNormal3d(C.GLdouble(0.0), C.GLdouble(0.0), C.GLdouble(-1.0))
C.glVertex3d(C.GLdouble(x), C.GLdouble(y), C.GLdouble(z+r))
r0 := r * sin[1]
z0 := z + r*cos[1]
for l := 0; l <= nLamp; l++ {
C.glNormal3d(-sin[1]*cos[l], -sin[1]*sin[l], -cos[1])
C.glVertex3d(x+r0*cos[l], y+r0*sin[l], z0)
}
C.glEnd()
C.glBegin(QUAD_STRIP)
var r1, z1 C.GLdouble
for b := 1; b <= nLamp/2-2; b++ {
r0, z0 = r*sin[b], z+r*cos[b]
r1, z1 = r*sin[b+1], z+r*cos[b+1]
for l := 0; l <= nLamp; l++ {
C.glNormal3d(-sin[b+1]*cos[l], -sin[b+1]*sin[l], -cos[b+1])
C.glVertex3d(x+r1*cos[l], y+r1*sin[l], z1)
C.glNormal3d(-sin[b]*cos[l], -sin[b]*sin[l], -cos[b])
C.glVertex3d(x+r0*cos[l], y+r0*sin[l], z0)
}
}
C.glEnd()
C.glBegin(TRIANGLE_FAN)
C.glNormal3d(0., 0., 1.)
C.glVertex3d(x, y, z-r)
r0, z0 = r*sin[1], z-r*cos[1]
b := nLamp/2 - 1
for l := 0; l <= nLamp; l++ {
C.glNormal3d(-sin[b]*cos[l], -sin[b]*sin[l], -cos[b])
C.glVertex3d(x+r0*cos[l], y+r0*sin[l], z0)
}
C.glEnd()
}